阅读说明：本技术 一种预制保温管生产工艺 (Production process of prefabricated heat-insulating pipe ) 是由 果风松 杨文波 沈长根 于 2021-07-20 设计创作，主要内容包括：本发明公开了一种预制保温管生产工艺,包括：步骤1：将外护层板材置于板材合拢成管装置上,并初步调整好位置；步骤2：将工作管置于外护层板材上方,调整好位置后,工作管两端支撑固定；步骤3：板材合拢成管装置将外护层板合拢到第二工作位置,二次调整外护层板材位置,并固定住外护层板材周边；步骤4：板材合拢成管装置将外护层板材合拢到第三工作位置,外护层板材成型管状外护层,管状外护层与工作管之间形成保温层空间,且管状外护层上表面预留有开口；步骤5：管状外护层和工作管的定位、找中,封堵保温层空间两端,焊接开口并向封闭保温层空间内填充聚氨酯,聚氨酯发泡、定型熟化并形成保温层,制品下线。(The invention discloses a production process of a prefabricated heat-insulating pipe, which comprises the following steps: step 1: placing the outer protective layer plate on a plate folding pipe forming device, and preliminarily adjusting the position; step 2: placing the working pipe above the outer protective layer plate, and after the position of the working pipe is adjusted, supporting and fixing two ends of the working pipe; and step 3: the plate folding and pipe forming device folds the outer protective layer plate to a second working position, adjusts the position of the outer protective layer plate for the second time, and fixes the periphery of the outer protective layer plate; and 4, step 4: the plate folding pipe forming device folds the outer protection layer plate to a third working position, the outer protection layer plate forms a tubular outer protection layer, a heat insulation layer space is formed between the tubular outer protection layer and the working pipe, and an opening is reserved on the upper surface of the tubular outer protection layer; and 5: positioning and centering the tubular outer protective layer and the working pipe, blocking two ends of the heat-insulating layer space, welding an opening, filling polyurethane into the closed heat-insulating layer space, foaming the polyurethane, shaping and curing to form a heat-insulating layer, and taking the product off line.)

1. A prefabricated heat preservation pipe production process is characterized by comprising the following steps:

step 1: placing the outer protective layer plate (1) on a plate folding pipe forming device (3), and preliminarily adjusting the position of the outer protective layer plate;

step 2: the working pipe (2) is arranged above the outer protective layer plate (1), and after the position is adjusted, two ends of the working pipe (2) are supported and fixed;

and step 3: the plate folding and pipe forming device (3) folds the outer protective layer plate to a second working position, adjusts the position of the outer protective layer plate (1) for the second time, and fixes the periphery of the outer protective layer plate (1);

and 4, step 4: the plate folding pipe forming device (3) folds the outer protection layer plate (1) to a third working position, the outer protection layer plate (1) forms a tubular outer protection layer, a heat insulation layer space (6) is formed between the tubular outer protection layer and the working pipe (2), and an opening is reserved on the upper surface of the tubular outer protection layer;

and 5: positioning and centering the tubular outer protective layer and the working pipe (2), plugging two ends of the heat-insulating layer space (6), welding an opening, filling polyurethane into the closed heat-insulating layer space (6), foaming the polyurethane, shaping and curing to form a heat-insulating layer, and taking the product off line.

2. The production process of the prefabricated heat preservation pipe as claimed in claim 1, wherein in the step 1, the production process further comprises the following steps: the outer sheath plate (1) is subjected to temperature pretreatment by using a plate preheating device.

3. The production process of the prefabricated heat preservation pipe as claimed in claim 1, wherein in the step 2, the production process further comprises the following steps: and utilizing a working pipe pre-heating device to carry out temperature pre-treatment on the working pipe (2).

4. A prefabricated thermal insulation pipe production process according to claim 2, wherein in step 1, said plate material folding pipe forming device (3) comprises:

a frame body (31);

the folding arm groups (32) are arranged on the frame body (31) at equal intervals along the length direction of the working pipe (2), each folding arm group (32) comprises an installation seat (33) and folding arms (34), the installation seats (33) are fixedly arranged on the frame body (31), and the two folding arms (34) are symmetrically hinged to the installation seats (33);

the supporting block (35), the supporting block (35) is fixedly installed above the installation seat (33), and the outer protective layer plate (1) is placed at the top end of the supporting block (35);

the two folding blocks (36) are fixedly arranged at the inner ends of the folding arms (34), and the inner ends of the folding blocks (36) are attached to the outer protective layer board (1);

the supporting beam (37), the supporting beam (37) is connected to the folding arm group (32) along the length direction of the working pipe (2), the supporting beam (37) is respectively and fixedly connected to the supporting block (35) and the folding block (36), and the supporting beam (37) is attached to the outer protective layer plate (1);

the jacking oil cylinders are arranged on the folding arm (34) in equal quantity, one end of each jacking oil cylinder is hinged with the frame body (31), and the other end of each jacking oil cylinder is hinged with the end, close to the mounting seat (33), of the folding arm (34);

when the third working position is adopted, the supporting block (35), the folding block (36) and the supporting beam (37) form a cylindrical structure with a gap at the top, and the gap is opposite to the opening.

5. The prefabricated heat preservation pipe production process according to claim 4, wherein in the step 5, the two ends of the heat preservation layer space (6) are plugged by using two end plugs (5), and the two end plugs (5) comprise:

the lower plugging plate (51), the lower plugging plate (51) is installed at the top end of the supporting block (35), and the working pipe (2) is placed at the top end of the lower plugging plate (51);

a side closure plate (52), the side closure plate (52) being mounted to the inner end of the closure block (36);

when the working pipe is in the third working position, the lower plugging plate (51) and the side plugging plate (52) form a circular ring-shaped two-end plugging, and the end part of the working pipe (2) is positioned at the inner ring end of the two-end plugging (5).

6. The prefabricated heat preservation pipe production process according to claim 4, wherein in the step 3, the periphery of the outer-covering plate (1) is fixed by using an auxiliary positioning mechanism (4), the auxiliary positioning mechanism (4) is installed at the inner end of the folding arm (34), and the auxiliary positioning mechanism (4) is located at the end, far away from the supporting block (35), of the folding block (36).

7. The prefabricated heat preservation pipe production process as claimed in claim 2, wherein the plate preheating device comprises:

the fixing seat (71) is fixedly arranged on the frame body (31), the fixing seat (71) is positioned between two adjacent folding arm groups (32), and the outer protective layer plate (1) is placed at the top end of the fixing seat (71);

the preheating groove (72) is formed in the top end of the fixed seat (71);

the auxiliary supporting mechanism (73), the auxiliary supporting mechanism (73) is installed in the central position in the preheating groove (72), and the auxiliary supporting mechanism (73) is used for supporting the central position of the outer protective layer plate (1);

the heating chamber (74) is arranged in the fixing seat (71), and the heating chamber (74) is positioned below the preheating groove (72);

the electric heater (75), the said electric heater (75) is mounted to the top in the said heating chamber (74);

the two air extraction chambers (76) are symmetrically arranged in the fixed seat (71) by taking the auxiliary supporting mechanism (73) as a center, and the air extraction chambers (76) are communicated with the heating chamber (74);

a first air outlet turbine (77), wherein the first air outlet turbine (77) is arranged in the air extracting chamber (76);

the first air supply channel (78), the first air supply channel (78) is arranged in the fixed seat (71), one end of the first air supply channel (78) is communicated with the air extraction chamber (76), and the other end of the first air supply channel (78) is communicated with the preheating groove (72);

one end of the first rotating shaft (79) extends into the air extracting chamber (76), and the first air outlet turbine (77) is arranged on the first rotating shaft (79);

a first motor (70), the first motor (70) being mounted on the first shaft (79).

8. The prefabricated heat preservation pipe production process as claimed in claim 7, wherein the plate preheating device further comprises:

the two mounting grooves (81) are arranged at the top end of the fixed seat (71) by taking the preheating groove (72) as the center;

the two rotating box installation chambers (82) are arranged in the fixed seat (71) by taking the preheating groove (72) as a center, the rotating box installation chambers (82) are communicated with the installation groove (81), and the rotating box installation chambers (82) are positioned at the ends, far away from the preheating groove (72), of the installation groove (81);

the second air supply channel (83), the second air supply channel (83) is arranged in the fixed seat (71), and the second air supply channel (83) is communicated between the heating chamber (74) and the rotating box installation chamber (82);

the bevel gear mounting chamber (84) is arranged in the fixed seat (71), the bevel gear mounting chamber (84) is positioned below the mounting groove (81), and the end, away from the first air outlet turbine (77), of the first rotating shaft (79) extends into the bevel gear mounting chamber (84);

the bevel gears (85), two of the bevel gears (85) are meshed and connected in the bevel gear mounting chamber (84), and one of the bevel gears (85) is mounted on the first rotating shaft (79);

a rotating box (86), the rotating box (86) being mounted in the rotating box mounting chamber (82);

the two first belt wheels (87) are arranged in the rotating box (86), and a first transmission belt (88) is sleeved on the two first belt wheels (87);

one end of the second rotating shaft (89) extends into the bevel gear mounting chamber (84) and is connected with the other bevel gear (85), the other end of the second rotating shaft (89) penetrates through the rotating box mounting chamber (82) and extends into the rotating box (86), and one first belt wheel (87) is mounted at the other end of the second rotating shaft (89);

the air outlet box (80) is mounted at the top end of the fixed seat (71), the bottom end of the air outlet box (80) covers the notch of the mounting groove (81), the bottom end of the air outlet box (80) is provided with an air inlet, the air inlet is communicated with the inside of the mounting groove (81), and the side end of the air outlet box (80) close to the preheating groove (72) is provided with an air outlet;

the third rotating shaft (91) is arranged in the mounting groove (81), and one end of the third rotating shaft (91) extends into the rotating box (86) and is connected with the other first belt pulley (87);

and the second air outlet turbine (92), the second air outlet turbine (92) is arranged in the mounting groove (81), and the second air outlet turbine (92) is mounted on the third rotating shaft (91).

9. The process for producing a prefabricated heat-insulating pipe as claimed in claim 8, wherein said plate preheating device further comprises:

the first pulley chamber (93), the first pulley chamber (93) is arranged in the fixed seat (71), and the first pulley chamber (93) is positioned below the preheating groove (72);

the second belt wheel chamber (94) and the gear transmission chamber (95) are symmetrically arranged in the fixed seat (71) by taking the preheating groove (72) as a center, and the second belt wheel chamber (94) and the gear transmission chamber (95) are respectively positioned between the installation groove (81) and the bevel gear installation chamber (84);

the three second belt wheels (58) are arranged in the first belt wheel chamber (93), and a second transmission belt (96) is sleeved on the three second belt wheels (58);

two third belt wheels (97) are arranged in the second belt wheel chamber (94), and a third transmission belt (98) is sleeved on the two third belt wheels (97);

one end of the fourth rotating shaft (99) extends into the first pulley chamber (93) and is connected with the second pulley (58) close to the second pulley chamber (94), and the other end of the fourth rotating shaft (99) extends into the second pulley chamber (94) and is connected with one of the third pulleys (97);

one end of the fifth rotating shaft (90) extends into the first belt wheel chamber (93) and is connected with the second belt wheel (58) close to the gear transmission chamber (95), and the other end of the fifth rotating shaft (90) extends into the gear transmission chamber (95);

a pair of gears (61) in mesh, said gears (61) being mounted within said gear drive chamber (95), one of said gears (61) being mounted on said fifth shaft (90);

the rotary disc (62), the rotary disc (62) is arranged in the mounting groove (81);

one end of the sixth rotating shaft (59), which is close to the second pulley chamber (94), of the sixth rotating shaft (59) is connected with the rotating disc (62), the other end of the sixth rotating shaft extends into the second pulley chamber (94) to be connected with the other third pulley (97), one end of the sixth rotating shaft (59), which is close to the gear transmission chamber (95), is connected with the rotating disc (62), and the other end of the sixth rotating shaft extends into the gear transmission chamber (95) to be connected with the other gear (61);

the outer shell (63) is mounted on the rotary disc (62), the air outlet box (80) is mounted at the top end of the outer shell (63), the air inlet is communicated with the inside of the outer shell (63), the third rotating shaft (91) penetrates through the outer shell (63), the second air outlet turbine (92) is positioned in the outer shell (63), and an air supply outlet is formed in the end, close to the rotary box mounting chamber (82), of the outer shell (63);

the sliding groove is formed in the position, far away from the rotating box installation chamber (82), of the inner wall of the installation groove (81);

the sliding block is connected in the sliding groove in a sliding mode, and the end, far away from the first belt wheel (87), of the third rotating shaft (91) is connected to the sliding block in a rotating mode;

the L-shaped support rod (64) is arranged in the bevel gear installation chamber (84), one end of the L-shaped support rod (64) is connected with the first rotating shaft (79), and the other end of the L-shaped support rod (64) is connected with the second rotating shaft (89);

the second motor (65), the second motor (65) is installed in the first pulley chamber (93), and the middle second pulley (58) is installed at the output end of the second motor (65);

the air outlet box (80) is of a cubic structure, and an inclined surface (66) used for abutting the periphery of the outer protection layer plate (1) is formed at an edge angle end, close to the preheating groove (72), of the air outlet box (80).

10. A prefabricated thermal insulation pipe production process according to claim 9, wherein said auxiliary support means (73) comprise:

the supporting seat (67) is vertically arranged at the central position in the preheating groove (72);

the two flap mounting seats (68) are symmetrically mounted at the top end of the supporting seat (67);

the turning plate mounting groove is formed in the top end of the turning plate mounting seat (68);

the flap mounting shaft (69) is rotatably connected in the flap mounting groove;

the turning plate (60) is mounted on the turning plate mounting shaft (69), and the end, far away from the turning plate mounting shaft (69), of the turning plate (60) abuts against the bottom of the outer protective layer plate (1);

the reset torsion spring is sleeved on the turning plate mounting shaft (69), one torsion arm end of the reset torsion spring is connected with the turning plate (60), and the other torsion arm end of the reset torsion spring is connected with the inner wall of the turning plate mounting groove;

the rope winding wheel (53), the rope winding wheel (53) is installed on the turning plate installation shaft (69);

the screw block mounting chamber (54), the screw block mounting chamber (54) is arranged in the supporting seat (67) and close to the bottom end;

the screw rod (55) is arranged in the screw block mounting chamber (54), one end of the screw rod (55) extends into the first belt wheel chamber (93), and is coaxially mounted on the second belt wheel (58) together with the output end of the second motor (65);

the screw block (56), the screw block (56) is connected in the screw block mounting chamber (54) in a sliding manner, and the screw block (56) is sleeved on the screw rod (55);

and one end of the rope body (57) is wound on the rope winding wheel (53), and the other end of the rope body (57) extends into the screw block installation chamber (54) and is connected to the screw block (56).

Technical Field

The invention relates to the field of production of prefabricated heat-insulating pipes, in particular to a production process of a prefabricated heat-insulating pipe.

Background

The general pipe diameter of prefabricated insulating tube is all great for the transport of fluid or gas, can lay also can lay underground on ground open air, and the prefabricated direct-burried insulating tube who is used for laying underground at present uses very extensively, and according to the difference of prefabricated insulating tube service environment, its technical indicator is slightly different, but the structure is basically the same, all comprises working pipe, outer jacket, heat preservation, alarm line four bibliographic categories branch, as shown in fig. 1, included working pipe, outer jacket, heat preservation and alarm line, wherein:

1. the working pipe is generally a steel pipe, and other materials may be used depending on the medium to be transported.

2. The outer sheath is generally a non-metallic thermoplastic material, and the material used is different according to the application of the insulating pipe, for example, the outer sheath of the direct-buried insulating pipe requires a high-density polyethylene (HDPE) material.

3. The material of the heat-insulating layer is generally polyurethane rigid foam plastic, and the density and the thickness of the heat-insulating layer are different according to different use working conditions of the heat-insulating pipe.

The alarm line is used for the maintenance and the safety protection of pipeline, and the alarm line can be selected as required to use, so some prefabricated insulating tube can not establish the alarm line when the preparation.

The production process of the prior prefabricated heat-insulating pipe comprises the following steps:

pouring foaming prefabricated thermal insulation pipe

1. The production process of the prefabricated heat-insulating pipe with the bracket filled with the foam comprises the following steps:

1) binding positioning brackets outside the working pipe at fixed intervals, wherein the positioning brackets are generally made of plastic or wood;

2) a pipe shell (namely an outer protective layer, commonly called a jacket) is sleeved outside the working pipe, at the moment, the support plays a role in centering and supporting the pipe shell, and an alarm line is fixed according to the needs of a product;

3) a special plug is used for plugging a gap between the working pipes at the two ends of the pipe orifice and the pipe shell, so that the heat insulation material is prevented from overflowing when being foamed;

4) after the working pipe is adjusted and fixed, heat insulation materials are poured into a pouring hole (the outer side of the pipe shell) which is prepared in advance, generally, the pouring hole is filled in a porous mode, and then a plug is used for plugging the pouring hole;

5) and after the thermal insulation material is foamed, shaped and cured, the production of the thermal insulation pipe is finished.

2. The production process of the non-bracket perfusion foaming prefabricated heat preservation pipe comprises the following steps:

1) the working pipe is penetrated into the pipe shell (namely a protective layer, commonly called jacket);

2) hoisting the working pipe and the pipe shell into a special foaming platform, fixing the working pipe, adjusting the position of the pipe shell, centering and shaping, laying an alarm line, and then plugging gaps at two ends;

3) pouring heat insulation materials into a pouring hole (the outer side of a pipe shell) which is prepared in advance, generally pouring the materials in a porous mode, and then plugging the pouring hole by using a plug;

4) and after the thermal insulation material is foamed, shaped and cured, the production of the thermal insulation pipe is finished.

The two production processes are that the working pipe and the protective layer are positioned and fixed firstly, then the thermal insulation material is directly poured into the reserved thermal insulation layer space, the difference is that whether the support is used for realizing the centering and the supporting of the protective layer in the preparation process, and the process is not as follows:

1) the pipe shells are all produced in advance, so that the pipe shells are prevented from being excessively deformed or damaged, the space utilization rate is extremely low during storage and transportation, and the storage, transportation and management costs are high;

2) whether the support is adopted to finish centering and supporting the protective layer or not, the early preparation work is relatively complicated and the production efficiency is low;

3) the sleeving of the pipe shell basically needs to be completed by means of special equipment, and a large production field and equipment investment are needed, for example: the length of the working pipe is 12 meters, and the field length space required when the working pipe is sleeved into the pipe shell is more than 24 meters;

4) when the side injection port is used for injecting polyurethane, a plug is used for plugging, the side injection port influences the integral protection effect and the integral appearance of the outer protective pipe, the injection port needs to be subjected to secondary treatment sometimes to achieve the required protection effect, and the production cost is increased;

5) the filling process can affect the foaming effect and filling quality of polyurethane, large excess filling operation has to be carried out in order to reach the required density and fullness of the heat-insulating layer, some excess is more than twice of the theoretical value, but the conditions of poor foaming effect, inconsistent density and the like still exist, the utilization rate of polyurethane raw materials is low, waste is large, and particularly when a large-diameter heat-insulating pipe is produced, tens of kilograms of heat-insulating materials can be consumed by increasing the excess by 10%, and the waste is more serious.

(II) spraying foaming winding protective layer prefabricated heat preservation pipe

The process comprises the following steps: firstly, placing a working pipe on special auxiliary spraying equipment, and positioning and fixing; spraying the outer surface of the working pipe, and spraying a polyurethane heat-insulating layer with a certain thickness according to requirements; the setting of the alarm line can be completed before or during the spraying of the heat-insulating layer according to the requirement; after the heat-insulating layer is cured, performing material supplementing and shaping operations on the heat-insulating layer (the process can be selected according to the product requirement); then the outer protective layer is wound outside the heat preservation layer. In the process, each step of working procedure can be completed by a single working position and then transferred to the next working position, and the process can also be operated in a continuous mode by a production line, wherein the working pipe is conveyed continuously, and the product production is continuously completed by spraying and then winding the working pipe. Compared with a pouring foaming method, the process is advanced and has a higher technical threshold, and the production efficiency of the synchronous spraying winding method is far higher than that of the step-by-step spraying winding method.

The defects are as follows:

1. each process can be completed only by special equipment, the equipment is various, the occupied production field is large, large capital investment and professional operators are required for realization, and the method is not beneficial to general popularization;

2. the production efficiency is still limited by the spraying process and the winding process of the heat-insulating layer, the large-size heat-insulating layer can meet the thickness requirement by spraying for many times, and the process has no obvious efficiency advantage compared with the pouring process;

3. because the heat-insulating layer is manufactured by adopting a spraying method, raw material splashing generated during spraying can pollute the production environment, so that a special spraying room and an air purification facility are required to be arranged for spraying operation and pollution treatment, and the production cost and the management cost are increased;

4. the product produced by the process is not very flat and smooth in appearance, which is related to the spraying quality (thickness uniformity and surface convex-concave degree) of the heat-insulating layer or the material supplementing quality and the shaping quality, the material supplementing operation increases the process link, the shaping operation with high requirement can cause the waste of heat-insulating materials, and meanwhile, the recovery treatment of the waste polyurethane heat-insulating layer material increases the production cost;

5. the outer protective layer generated by the winding method has the largest thickness at the lap joint and the smallest thickness at the non-lap joint, and according to the theory of equal thickness of materials, the lap joint belongs to the waste area of the outer protective layer material, and the lap joint part of the outer protective layer material is distributed on the surface of the heat preservation pipe in a spiral shape, so that the occupation ratio is not negligible, the utilization rate of the outer protective material in the process is not high, the waste is large, and the production cost of the product is increased.

Disclosure of Invention

In order to achieve the purpose, the invention discloses a production process of a prefabricated heat-insulating pipe, which comprises the following steps:

step 1: placing the outer protective layer plate on a plate folding pipe forming device, and preliminarily adjusting the position of the outer protective layer plate;

step 2: placing the working pipe above the outer protective layer plate, and after the position of the working pipe is adjusted, supporting and fixing two ends of the working pipe;

and step 3: the plate folding and pipe forming device folds the outer protective layer plate to a second working position, adjusts the position of the outer protective layer plate for the second time, and fixes the periphery of the outer protective layer plate;

and 4, step 4: the plate folding pipe forming device folds the outer protection layer plate to a third working position, the outer protection layer plate forms a tubular outer protection layer, a heat insulation layer space is formed between the tubular outer protection layer and the working pipe, and an opening is reserved on the upper surface of the tubular outer protection layer;

and 5: positioning and centering the tubular outer protective layer and the working pipe, blocking two ends of the heat-insulating layer space, welding an opening, filling polyurethane into the closed heat-insulating layer space, foaming the polyurethane, shaping and curing to form a heat-insulating layer, and taking the product off line.

Preferably, step 1 further comprises: and carrying out temperature pretreatment on the outer protective layer plate by using a plate preheating device.

Preferably, step 2 further comprises: the working pipe 2 is subjected to temperature pretreatment by using a working pipe preheating device.

Preferably, in step 1, the device for folding the plates into the tube comprises:

a frame body;

the folding arm groups are arranged on the frame body at equal intervals along the length direction of the working pipe and comprise mounting seats and folding arms, the mounting seats are fixedly arranged on the frame body, and the two folding arms are symmetrically hinged to the mounting seats;

the supporting block is fixedly arranged above the mounting seat, and the outer protective layer plate is placed at the top end of the supporting block;

the two folding blocks are fixedly arranged at the inner ends of the folding arms, and the inner ends of the folding blocks are attached to the outer protective layer plate;

the supporting beam is connected to the folding arm group along the length direction of the working pipe, the supporting beam is fixedly connected to the supporting block and the folding block respectively, and the supporting beam is attached to the outer protective layer plate;

the jacking oil cylinders are arranged on the folding arms in equal quantity, one end of each jacking oil cylinder is hinged with the frame body, and the other end of each jacking oil cylinder is hinged with the end, close to the mounting base, of the corresponding folding arm;

when the third working position is adopted, the supporting block, the folding block and the supporting beam form a cylindrical structure with a gap at the top, and the gap is opposite to the opening.

Preferably, in step 5, the two ends of the heat preservation layer space are plugged by using the two ends for plugging, and the two ends for plugging comprise:

the lower plugging plate is arranged at the top end of the supporting block, and the working pipe is placed at the top end of the lower plugging plate;

the side plugging plate is arranged at the inner end of the closure block;

when the working pipe is in the third working position, the lower plugging plate and the side plugging plate form two circular end plugs, and the end part of the working pipe is located at the inner ring end of the two end plugs.

Preferably, in step 3, the periphery of the outer protective layer plate is fixed by using an auxiliary positioning mechanism, the auxiliary positioning mechanism is installed at the inner end of the folding arm, and the auxiliary positioning mechanism is located at the end, far away from the supporting block, of the folding block.

Preferably, the plate preheating device includes:

the fixing seat is fixedly arranged on the frame body and is positioned between two adjacent folding arm groups, and the outer protective layer board is placed at the top end of the fixing seat;

the preheating groove is formed in the top end of the fixed seat;

the auxiliary supporting mechanism is arranged at the central position in the preheating groove and is used for supporting the central position of the outer protective layer plate;

the heating chamber is arranged in the fixing seat and is positioned below the preheating groove;

the electric heater is arranged on the top in the heating chamber;

the two air pumping chambers are symmetrically arranged in the fixed seat by taking the auxiliary supporting mechanism as a center, and are communicated with the heating chamber;

the first air outlet turbine is arranged in the air draft chamber;

the first air supply channel is arranged in the fixed seat, one end of the first air supply channel is communicated with the air extraction chamber, and the other end of the first air supply channel is communicated with the preheating groove;

one end of the first rotating shaft extends into the air draft chamber, and the first air outlet turbine is arranged on the first rotating shaft;

the first motor is arranged on the first rotating shaft.

Preferably, the plate preheating device further includes:

the two mounting grooves are arranged at the top end of the fixed seat by taking the preheating groove as a center;

the two rotating box installation chambers are arranged in the fixed seat by taking the preheating groove as a center, are communicated in the installation groove and are positioned at the end, far away from the preheating groove, of the installation groove;

the second air supply channel is arranged in the fixed seat and communicated between the heating chamber and the rotating box installation chamber;

the helical gear mounting chamber is arranged in the fixed seat, the helical gear mounting chamber is positioned below the mounting groove, and the end, far away from the first air outlet turbine, of the first rotating shaft extends into the helical gear mounting chamber;

the two bevel gears are meshed and connected in the bevel gear mounting chamber, and one of the bevel gears is mounted on the first rotating shaft;

the rotating box is arranged in the rotating box installation chamber;

the two first belt wheels are arranged in the rotating box, and the first transmission belt is sleeved on the two first belt wheels;

one end of the second rotating shaft extends into the bevel gear mounting chamber and is connected with the other bevel gear, the other end of the second rotating shaft penetrates through the rotating box mounting chamber and extends into the rotating box, and one first belt pulley is mounted at the other end of the second rotating shaft;

the air outlet box is mounted at the top end of the fixed seat, the bottom end of the air outlet box covers the notch of the mounting groove, the bottom end of the air outlet box is provided with an air inlet, the air inlet is communicated with the mounting groove, and the side end of the air outlet box, which is close to the preheating groove, is provided with an air outlet;

the third rotating shaft is arranged in the mounting groove, and one end of the third rotating shaft extends into the rotating box and is connected with the other first belt pulley;

and the second air outlet turbine is arranged in the mounting groove and is arranged on the third rotating shaft.

Preferably, the plate preheating device further includes:

the first pulley chamber is arranged in the fixed seat and is positioned below the preheating groove;

the second belt wheel chamber and the gear transmission chamber are symmetrically arranged in the fixed seat by taking the preheating groove as a center, and are respectively positioned between the mounting groove and the helical gear mounting chamber;

the three second belt wheels are arranged in the first belt wheel chamber, and a second transmission belt is sleeved on the three second belt wheels;

two third belt wheels are arranged in the second belt wheel chamber, and a third transmission belt is sleeved on the two third belt wheels;

one end of the fourth rotating shaft extends into the first belt wheel chamber and is connected with the second belt wheel close to the second belt wheel chamber, and the other end of the fourth rotating shaft extends into the second belt wheel chamber and is connected with one of the third belt wheels;

one end of the fifth rotating shaft extends into the first belt wheel chamber and is connected with the second belt wheel close to the gear transmission chamber, and the other end of the fifth rotating shaft extends into the gear transmission chamber;

a pair of gears in mesh, the gears being mounted within the gear drive chamber, one of the gears being mounted on the fifth shaft;

the rotary disc is arranged in the mounting groove;

one end of the sixth rotating shaft close to the second belt wheel chamber is connected with the rotary table, the other end of the sixth rotating shaft extends into the second belt wheel chamber and is connected with the other third belt wheel, one end of the sixth rotating shaft close to the gear transmission chamber is connected with the rotary table, and the other end of the sixth rotating shaft extends into the gear transmission chamber and is connected with the other gear;

the casing is arranged on the turntable, the air outlet box is arranged at the top end of the casing, the air inlet is communicated with the inside of the casing, the third rotating shaft penetrates through the casing, the second air outlet turbine is positioned in the casing, and an air supply outlet is formed in the end, close to the rotating box installation chamber, of the casing;

the sliding groove is formed in the position, far away from the rotating box installation chamber, of the inner wall of the installation groove;

the sliding block is connected in the sliding groove in a sliding mode, and the end, far away from the first pulley, of the third rotating shaft is connected to the sliding block in a rotating mode;

the L-shaped supporting rod is arranged in the helical gear mounting chamber, one end of the L-shaped supporting rod is connected with the first rotating shaft, and the other end of the L-shaped supporting rod is connected with the second rotating shaft;

the second motor is arranged in the first belt wheel chamber, and the middle second belt wheel is arranged at the output end of the second motor;

the air outlet box is of a cubic structure, and an inclined surface used for abutting the periphery of the outer protection layer plate is formed at the edge angle end, close to the preheating groove, of the air outlet box.

Preferably, the auxiliary support mechanism includes:

the supporting seat is vertically arranged at the central position in the preheating groove;

the two turning plate installation seats are symmetrically arranged at the top end of the supporting seat;

the turning plate mounting groove is formed in the top end of the turning plate mounting seat;

the turning plate mounting shaft is rotationally connected in the turning plate mounting groove;

the turning plate is arranged on the turning plate installation shaft, and the end, far away from the turning plate installation shaft, of the turning plate abuts against the bottom of the outer protective layer plate;

the reset torsion spring is sleeved on the turning plate mounting shaft, one torsion arm end of the reset torsion spring is connected with the turning plate, and the other torsion arm end of the reset torsion spring is connected with the inner wall of the turning plate mounting groove;

the rope winding wheel is arranged on the turning plate installation shaft;

the screw block mounting chamber is arranged in the supporting seat and close to the bottom end;

the screw rod is arranged in the screw block mounting chamber, one end of the screw rod extends into the first belt wheel chamber and is coaxially mounted on the second belt wheel together with the output end of the second motor;

the screw block is slidably connected in the screw block installation chamber and sleeved on the screw rod;

and one end of the rope body is wound on the rope winding wheel, and the other end of the rope body extends into the screw block installation chamber and is connected to the screw block.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a prefabricated insulation pipe structure according to the present invention;

FIG. 2 is a process flow diagram of the present invention;

FIG. 3 is a schematic view of the initial working position of the apparatus for forming a pipe by folding a plate according to the process of the present invention;

FIG. 4 is a schematic view of a second working position of the plate folding and pipe forming device according to the process of the present invention;

FIG. 5 is a schematic view of a third operating position of the apparatus for forming a tube by folding a sheet material according to the process of the present invention;

FIG. 6 is a perspective view of a sheet material gathering and tubing apparatus of the present invention;

FIG. 7 is a first schematic structural view of a plate preheating apparatus according to the process of the present invention;

FIG. 8 is a schematic structural view of a plate preheating apparatus according to the process of the present invention;

FIG. 9 is a schematic structural view of a plate preheating apparatus according to the process of the present invention;

fig. 10 is a perspective view of an outlet box of the process of the present invention.

In the figure: 1. an outer jacket sheet material; 2. a working pipe; 3. folding the plates into a pipe device; 4. an auxiliary positioning mechanism; 5. plugging two ends; 6. a heat insulation layer space; 51. a lower plugging plate; 52. a side closure plate; 53. a rope winding wheel; 54. a screw block installation chamber; 55. a screw; 56. a screw block; 57. a rope body; 58. a second pulley; 59. a sixth rotating shaft; 61. a gear; 62. a turntable; 63. a housing; an L-shaped support bar; 65. a second motor; 66. an inclined surface; 67. a supporting seat; 68. a turning plate mounting seat; 69. a flap mounting shaft; 60. turning over a plate; 71. a fixed seat; 72. a preheating tank; 73. an auxiliary support mechanism; 74. a heating chamber; 75. an electric heater; 76. an air extraction chamber; 77. a first air outlet turbine; 78. a first air supply passage; 79. a first rotating shaft; 70. a first motor; 81. mounting grooves; 82. a rotating box installation chamber; 83. a second air supply passage; 84. a helical gear mounting chamber; 85. a helical gear; 86. a rotating box; 87. a first pulley; 88. a first drive belt; 89. a second rotating shaft; 80. an air outlet box; 91. a third rotating shaft; 92. a second air outlet turbine; 93. a first pulley chamber; 94. a second pulley chamber; 95. a gear drive chamber; 96. a second belt; 97. a third belt pulley; 98. a third belt; 99. a fourth rotating shaft; 90. and a fifth rotating shaft.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

The invention will be further described with reference to the accompanying drawings.

As shown in fig. 2, the production process of the prefabricated heat preservation pipe provided by this embodiment includes:

step 1: placing the outer protective layer plate 1 on a plate folding pipe forming device 3, and preliminarily adjusting the position of the outer protective layer plate;

step 2: placing the working pipe 2 above the outer protective layer plate 1, and after the position is adjusted, supporting and fixing two ends of the working pipe 2;

and step 3: the plate folding and pipe forming device 3 folds the outer protective layer plate to a second working position, adjusts the position of the outer protective layer plate 1 for the second time, and fixes the periphery of the outer protective layer plate 1;

and 4, step 4: the plate folding pipe forming device 3 folds the outer protection layer plate 1 to a third working position, the outer protection layer plate 1 forms a tubular outer protection layer, a heat insulation layer space 6 is formed between the tubular outer protection layer and the working pipe 2, and an opening is reserved on the upper surface of the tubular outer protection layer;

and 5: positioning and centering the tubular outer protective layer and the working pipe 2, plugging two ends of the heat preservation layer space 6, welding an opening, filling polyurethane into the closed heat preservation layer space 6, foaming the polyurethane, shaping and curing to form a heat preservation layer, and taking the product off line.

The working principle of the technical scheme is as follows:

the invention discloses a production process of a prefabricated heat-insulating pipe, which comprises the steps of firstly placing an outer protective layer plate 1 on a plate folding pipe forming device 3, and preliminarily adjusting the position of the outer protective layer plate 1; the outer protective plate is subjected to temperature pretreatment according to the environment and the temperature of the outer protective plate, so that the outer protective plate can be folded and formed conveniently and the polyurethane foaming quality can be improved; then the working pipe 2 is arranged above the outer protective layer plate 1, and after the position is adjusted, two ends of the working pipe 2 are supported and fixed (the step is completed before the folding arms are completely folded); the temperature of the working pipe is pretreated according to the environment and the temperature of the working pipe, so that the polyurethane foaming quality is improved (the two temperature pretreatment processes can be selectively used, and the product can meet the requirements); the plate folding and pipe forming device 3 is folded to a second working position shown in figure 4, and the outer protective layer plate 1 moves along with the folding arm in the process; adjusting the position relation between the outer protective layer plate 1 and the folding arm, and clamping the folding arm on the periphery of the outer protective layer plate 1 by virtue of an auxiliary limiting mechanism 4; starting the folding arm to fold to a third working position shown in fig. 5 again, forcibly folding the outer protective layer plate 1 into a tubular shape, adjusting the position of the outer protective layer plate 1 or the working pipe 2, and positioning and centering the tubular outer protective layer and the working pipe 2 to ensure that the tubular outer protective layer and the working pipe 2 are concentric; plugging two ends of the heat-insulating layer space 6, preparing for welding and manufacturing a heat-insulating layer; welding and closing the opening of the tubular outer protective layer; after the welding of the outer protective layer with a certain size is finished, starting a spraying filling gun to spray or fill polyurethane into the closed heat insulation layer space 6; the two end plugs are opened and closed in time, avoid welding and spraying and pouring operation are carried out; and finally, unfolding the folding arms after the heat-insulating layer is foamed, shaped and cured, and inserting the product off line to finish the whole process flow.

The beneficial effects of the above technical scheme are:

1. compared with the prior art, the process is simpler, the area of the required production field is reduced by about 40%, the equipment investment is greatly reduced, the process is convenient for operators to master and realize, and the process is suitable for large-scale popularization;

2. the outer protective layer is formed by adopting plate on-line welding and can be shaped and cured in real time, the manufacturing of the heat-insulating layer and the welding of the outer protective layer are basically completed synchronously, and the production period only depends on the time for loading, manufacturing the heat-insulating layer and shaping, curing and off-line of a product, so that compared with a pouring method process, the pipe penetrating time is saved, the early-stage preparation time is shortened, the production efficiency is greatly improved, and compared with a synchronous spraying and winding method, the efficiency is also improved;

3. the outer protective material is stored and transported in a plate form, so that the storage space and the transportation cost are greatly saved, the initial estimation is at least not less than 50%, the problems of excessive deformation or damage and the like of the traditional pipe shell (outer protective layer, commonly called jacket) do not need to be considered, and the transportation and the management are more convenient;

4. the process can realize continuous and uniform spraying/pouring of the heat-insulating material, the manufacture of the heat-insulating layer is not limited to a spraying method or a pouring method, but also can be combined with a plurality of gun heads in a complementary way, the optimal foaming reaction condition is created for the polyurethane material, the density of the heat-insulating layer is uniform and consistent, the plumpness is high, the utilization rate of the heat-insulating material is improved to the maximum extent, at least 30 percent of the heat-insulating material can be saved compared with the pouring method process, and the consistency of the product is also ensured;

5. in the process of manufacturing the heat-insulating layer, the particle fillers such as polyurethane particles can be quantitatively conveyed into the closed space of the heat-insulating layer, the particle fillers are mixed with the heat-insulating material in an external mixing mode to form the heat-insulating layer, so that the polyurethane waste is recycled, various performance indexes of the heat-insulating layer can be improved by adding different particles, other processes cannot realize full mixing and uniform distribution of the particle fillers in an external mixing mode, and cannot realize 100% utilization of the quantitatively input particles, which is an innovation of the process;

6. the process can implement spraying operation in a closed heat-insulating layer space, not only retains the advantages of a spraying method, but also avoids the pollution of spraying splashing to the environment, and is an innovation in the aspect of manufacturing the heat-insulating layer;

7. compared with a winding method, the welding part of the outer protective layer is distributed on the surface of the heat preservation pipe in a straight line and full length, the length of the welding part is far smaller than the lap joint length of the winding method, the material utilization rate is high, and no waste is basically caused;

8. the process is characterized in that after the outer protective plate and the working pipe are installed in place, a corresponding temperature pretreatment link is arranged, the outer protective plate can be conveniently formed at a proper temperature, the foaming quality and the utilization rate of the heat-insulating material can be improved, the link has obvious advantages in the production environment in winter in the north, the pretreatment link can run through the whole process flow according to the production requirement after being started automatically, and can also be stopped or started at any time in the production process;

9. the process can realize mechanical operation in each working link, and the whole process flow can completely realize automatic and intelligent production.

In one embodiment, step 1 further includes: the outer sheath plate 1 is subjected to temperature pretreatment by using a plate preheating device.

The beneficial effects of the above technical scheme are:

so that the outer protective layer plate 1 can be folded and formed conveniently and the polyurethane foaming quality can be improved.

In one embodiment, step 2 further includes: the working pipe 2 is subjected to temperature pretreatment by using a working pipe preheating device.

The beneficial effects of the above technical scheme are:

the polyurethane foaming quality is convenient to improve.

As shown in fig. 3 to 6, in one embodiment, in step 1, the folding of the sheet material into the tube device 3 comprises:

a frame body 31;

the folding arm groups 32 are arranged on the frame body 31 at equal intervals along the length direction of the working pipe 2, each folding arm group 32 comprises an installation seat 33 and a folding arm 34, the installation seats 33 are fixedly arranged on the frame body 31, and the two folding arms 34 are symmetrically hinged to the installation seats 33;

the supporting block 35 is fixedly arranged above the mounting seat 33, and the outer protective layer plate 1 is placed at the top end of the supporting block 35;

the two folding blocks 36 are fixedly arranged at the inner ends of the folding arms 34, and the inner ends of the folding blocks 36 are attached to the outer protective layer plate 1;

the supporting beam 37 is connected to the folding arm group 32 along the length direction of the working pipe 2, the supporting beam 37 is respectively and fixedly connected to the supporting block 35 and the folding block 36, and the supporting beam 37 is attached to the outer protective layer plate 1;

the jacking oil cylinders are arranged on the folding arms 34 in equal quantity, one end of each jacking oil cylinder is hinged with the frame body 31, and the other end of each jacking oil cylinder is hinged with the end, close to the mounting seat 33, of the folding arm 34;

when the third working position is adopted, the supporting block 35, the folding block 36 and the supporting beam 37 form a cylindrical structure with a gap at the top, and the gap is opposite to the opening.

The working principle and the beneficial effects of the technical scheme are as follows:

the jacking cylinder pushes the two folding arms 34 symmetrically hinged to the mounting base 33 to fold to a second working position shown in fig. 4, at this time, the outer protective layer plate 1 is recessed, the bottom end of the outer protective layer plate 1 is close to the supporting block 35, when the two folding arms 34 are turned inwards, the outer protective layer plate 1 is gradually attached to the folding block 36, at this time, the auxiliary positioning mechanism 4 fixes the periphery of the outer protective layer plate 1 to prevent the outer protective layer plate 1 from being turned over when being further folded, and when the two folding arms 34 are folded to a third working position shown in fig. 5, the outer protective layer plate 1 forms a tubular structure with an opening reserved on the upper surface.

In one embodiment, in step 5, the two ends of the insulation layer space 6 are sealed by using two end plugs 5, where the two end plugs 5 include:

the lower plugging plate 51 is mounted at the top end of the supporting block 35, and the working pipe 2 is placed at the top end of the lower plugging plate 51;

a side closure plate 52, said side closure plate 52 being mounted at the inner end of said closure block 36;

when the working pipe 2 is in the third working position, the lower plugging plate 51 and the side plugging plate 52 form a circular ring-shaped plug at two ends, and the end part of the working pipe is positioned at the inner ring end of the plug 5 at two ends.

The working principle and the beneficial effects of the technical scheme are as follows:

the arrangement of two end plugs 5 forms a closed space in the heat-insulating layer space 6, which is convenient for spraying or injecting polyurethane.

In one embodiment, in step 3, the periphery of the sheath board 1 is fixed by using the auxiliary positioning mechanism 4, the auxiliary positioning mechanism 4 is installed at the inner end of the folding arm 34, and the auxiliary positioning mechanism 4 is located at the end of the folding block 36 away from the supporting block 35.

The beneficial effects of the above technical scheme are:

the auxiliary positioning mechanism 4 fixes the periphery of the outer sheath board 1 to prevent the outer sheath board 1 from turning over when being folded further.

As shown in fig. 7, in one embodiment, the plate preheating device includes:

the fixing seat 71 is fixedly installed on the frame body 31, the fixing seat 71 is located between two adjacent folding arm groups 32, and the outer protective layer plate 1 is placed at the top end of the fixing seat 71;

the preheating groove 72 is formed in the top end of the fixed seat 71;

the auxiliary supporting mechanism 73 is installed in the preheating groove 72 at the center, and the auxiliary supporting mechanism 73 is used for supporting the center of the outer sheath plate 1;

a heating chamber 74, wherein the heating chamber 74 is arranged in the fixing base 71, and the heating chamber 74 is positioned below the preheating groove 72;

an electric heater 75, wherein the electric heater 75 is installed at the top inside the heating chamber 74;

the two air pumping chambers 76 are symmetrically arranged in the fixed seat 71 by taking the auxiliary supporting mechanism 73 as a center, and the air pumping chambers 76 are communicated with the heating chamber 74;

a first air outlet turbine 77, wherein the first air outlet turbine 77 is arranged in the air extraction chamber 76;

a first air supply channel 78, wherein the first air supply channel 78 is arranged in the fixed seat 71, one end of the first air supply channel 78 is communicated with the air extraction chamber 76, and the other end of the first air supply channel 78 is communicated with the preheating groove 72;

a first rotating shaft 79, one end of the first rotating shaft 79 extends into the air extracting chamber 76, and the first air outlet turbine 77 is installed on the first rotating shaft 79;

a first motor 70, said first motor 70 being mounted on said first shaft 79.

The working principle and the beneficial effects of the technical scheme are as follows:

the outer jacket plate 1 is placed on the top end of the fixing seat 71 and covers the notch of the preheating groove 72, the auxiliary supporting mechanism 73 supports the center of the outer jacket plate 1, at this time, the electric heater 75 works to generate high-temperature air in the heating chamber 74, the first fan 70 works to further drive the first rotating shaft 79 to rotate, the first rotating shaft 79 drives the first air outlet turbine 77 located in the air extracting chamber 76 to rotate, so that the high-temperature air in the heating chamber 74 is sucked into the preheating groove 72 from the first air supply channel 78, and preheating operation is performed on the lower surface of the outer jacket plate 1 covered on the preheating groove 72.

As shown in fig. 8, in one embodiment, the plate preheating device further includes:

the two mounting grooves 81 are formed in the top end of the fixed seat 71 by taking the preheating groove 72 as a center;

the two rotating box installation chambers 82 are arranged in the fixed seat 71 by taking the preheating groove 72 as a center, the rotating box installation chambers 82 are communicated with the installation groove 81, and the rotating box installation chambers 82 are positioned at the ends, far away from the preheating groove 72, of the installation groove 81;

a second air supply passage 83, the second air supply passage 83 being provided in the fixing base 71, the second air supply passage 83 communicating between the heating chamber 74 and the rotation box installation chamber 82;

a bevel gear mounting chamber 84, wherein the bevel gear mounting chamber 84 is arranged in the fixed seat 71, the bevel gear mounting chamber 84 is positioned below the mounting groove 81, and the end of the first rotating shaft 79, which is far away from the first air outlet turbine 77, extends into the bevel gear mounting chamber 84;

a bevel gear 85, two of the bevel gears 85 are engaged and connected in the bevel gear mounting chamber 84, wherein one of the bevel gears 85 is mounted on the first rotating shaft 79;

a rotating box 86, the rotating box 86 being installed in the rotating box installation chamber 82;

two first belt pulleys 87, wherein the two first belt pulleys 87 are arranged in the rotating box 86, and a first transmission belt 88 is sleeved on the two first belt pulleys 87;

one end of the second rotating shaft 89 extends into the bevel gear mounting chamber 84 and is connected with the other bevel gear 85, the other end of the second rotating shaft 89 penetrates through the rotating box mounting chamber 82 and extends into the rotating box 86, and one first belt wheel 87 is mounted at the other end of the second rotating shaft 89;

the air outlet box 80 is mounted at the top end of the fixed seat 71, the bottom end of the air outlet box 80 covers the notch of the mounting groove 81, the bottom end of the air outlet box 80 is provided with an air inlet, the air inlet is communicated with the mounting groove 81, and the side end of the air outlet box 80, which is close to the preheating groove 72, is provided with an air outlet;

the third rotating shaft 91 is arranged in the mounting groove 81, one end of the third rotating shaft 91 extends into the rotating box 86 and is connected with the other first belt pulley 87;

and the second air outlet turbine 92 is arranged in the mounting groove 81, and the second air outlet turbine 92 is mounted on the third rotating shaft 91.

The working principle and the beneficial effects of the technical scheme are as follows:

when the outer sheath board 1 is placed on the top of the fixing seat 71, the two air outlet boxes 80 limit the periphery of the outer sheath board 1, the first fan 70 drives the two meshed bevel gears 85 positioned in the bevel gear installation chamber 84 to rotate through the first rotating shaft 79, the bevel gears 85 drive the first belt pulleys 87 positioned in the rotating box 86 through the second rotating shaft 89, the first driving belt 88 rotates, so as to drive the third rotating shaft 91 to rotate, and further drive the second air outlet turbines 92 positioned in the installation grooves 81, and the second air outlet turbines 92 installed on the third rotating shaft 91 rotate, the second air outlet turbines 92 suck part of high-temperature air from the second air supply channel 83 into the installation grooves 81 of the rotating box installation chamber 82, and the high-temperature air is sent out through the air outlets after being sent into the air outlet boxes 80 through the air inlets, so as to preheat the upper surface of the outer sheath board 1.

As shown in fig. 9 and 10, in one embodiment, the plate preheating device further includes:

a first pulley chamber 93, wherein the first pulley chamber 93 is arranged in the fixed seat 71, and the first pulley chamber 93 is positioned below the preheating groove 72;

a second pulley chamber 94 and a gear transmission chamber 95, wherein the second pulley chamber 94 and the gear transmission chamber 95 are symmetrically arranged in the fixed seat 71 by taking the preheating groove 72 as a center, and the second pulley chamber 94 and the gear transmission chamber 95 are respectively positioned between the mounting groove 81 and the bevel gear mounting chamber 84;

the three second belt wheels 58 are mounted in the first belt wheel chamber 93, and a second transmission belt 96 is sleeved on the three second belt wheels 58;

two third belt wheels 97 are arranged in the second belt wheel chamber 94, and a third transmission belt 98 is sleeved on the two third belt wheels 97;

one end of the fourth rotating shaft 99 extends into the first pulley chamber 93 and is connected with the second pulley 58 close to the second pulley chamber 94, and the other end of the fourth rotating shaft 99 extends into the second pulley chamber 94 and is connected with one of the third pulleys 97;

one end of the fifth rotating shaft 90 extends into the first pulley chamber 93 and is connected with the second pulley 58 close to the gear transmission chamber 95, and the other end of the fifth rotating shaft 90 extends into the gear transmission chamber 95;

a pair of gears 61 engaged, said gears 61 being mounted in said gear drive chamber 95, one of said gears 61 being mounted on said fifth shaft 90;

the rotating disc 62 is arranged in the mounting groove 81;

one end of the sixth rotating shaft 59, which is close to the second pulley chamber 94, is connected with the rotating disc 62, the other end of the sixth rotating shaft 59 extends into the second pulley chamber 94 to be connected with another third pulley 97, one end of the sixth rotating shaft 59, which is close to the gear transmission chamber 95, is connected with the rotating disc 62, and the other end of the sixth rotating shaft extends into the gear transmission chamber 95 to be connected with another gear 61;

the outer shell 63 is mounted on the turntable 62, the air outlet box 80 is mounted at the top end of the outer shell 63, the air inlet is communicated with the inside of the outer shell 63, the third rotating shaft 91 penetrates through the outer shell 63, the second air outlet turbine 92 is positioned in the outer shell 63, and an air supply outlet is formed in the end, close to the rotating box mounting chamber 82, of the outer shell 63;

the sliding groove is formed in the position, far away from the rotating box installation chamber 82, of the inner wall of the installation groove 81;

the sliding block is connected in the sliding groove in a sliding manner, and the end, far away from the first belt wheel 87, of the third rotating shaft 91 is rotatably connected to the sliding block;

the L-shaped support rod 64 is arranged in the bevel gear installation chamber 84, one end of the L-shaped support rod 64 is connected with the first rotating shaft 79, and the other end of the L-shaped support rod 64 is connected with the second rotating shaft 89;

a second motor 65, wherein the second motor 65 is installed in the first pulley chamber 93, and the middle second pulley 58 is installed at the output end of the second motor 65;

the air outlet box 80 is of a cubic structure, and the edge angle end of the air outlet box 80 close to the preheating groove 72 is provided with an inclined surface 66 for abutting the periphery of the outer protection layer plate 1.

The working principle and the beneficial effects of the technical scheme are as follows:

the second motor 65 rotates to drive the three second belt wheels 58 sleeved in the first belt wheel chamber 93 through the second belt 96 to rotate synchronously, the second belt wheel 58 close to the second belt wheel chamber 94 drives the two third belt wheels 97 and the third belt 98 in the second belt wheel chamber 94 to rotate through the fourth rotating shaft 99, the second belt wheel 58 close to the gear transmission chamber 95 drives the two gears 61 engaged in the gear transmission chamber 95 to rotate through the fifth rotating shaft 90, the turntable 62 in the mounting groove 81 drives the outer shell 63 mounted on the turntable 62 to rotate through the sixth rotating shaft 59, the outer shell 63 drives the third alignment shaft 91 to rotate along the sliding chute and the sliding block, so that the rotating box 86 rotates in the rotating box mounting chamber 82, the cross section of the rotating box mounting chamber 82 is arranged in an arc shape to adapt to the rotation of the rotating box 86, so that the two air outlet boxes 80 symmetrically arranged by taking the preheating groove 72 as a center are turned in directions close to each other, that is, as shown in fig. 9, when the left air outlet box 80 is turned clockwise, the right air outlet box 80 is turned counterclockwise, fig. 10 is a perspective view of the left air outlet box 80, and when the left air outlet box 80 is turned, the inclined surface 66 is turned toward the preheating groove 72, so that when the closing arm 34 is turned from the initial operating position to the second operating position, the inclined surface 66 is always attached to the periphery of the outer sheathing panel 1, thereby preventing the outer sheathing panel 1 from being turned.

In one embodiment, the auxiliary support mechanism 73 includes:

the supporting seat 67 is vertically arranged at the central position in the preheating groove 72;

the two flap installation seats 68 are symmetrically arranged at the top end of the supporting seat 67;

the turning plate mounting groove is formed in the top end of the turning plate mounting seat 68;

the flap mounting shaft 69 is rotatably connected in the flap mounting groove;

the turning plate 60 is arranged on the turning plate mounting shaft 69, and the end, far away from the turning plate mounting shaft 69, of the turning plate 60 abuts against the bottom of the outer protective layer plate 1;

the reset torsion spring is sleeved on the turning plate mounting shaft 69, one torsion arm end of the reset torsion spring is connected with the turning plate 60, and the other torsion arm end of the reset torsion spring is connected with the inner wall of the turning plate mounting groove;

the rope winding wheel 53 is mounted on the turning plate mounting shaft 69;

the screw block mounting chamber 54 is arranged in the support seat 67 and is close to the bottom end;

the screw 55 is arranged in the screw block installation chamber 54, one end of the screw 55 extends into the first belt pulley chamber 93, and is coaxially installed on the second belt pulley 58 with the output end of the second motor 65;

the screw block 56, the screw block 56 is slidably connected in the screw block mounting chamber 54, and the screw block 56 is sleeved on the screw rod 55;

and one end of the rope body 57 is wound on the rope winding wheel 53, and the other end of the rope body 57 extends into the screw block installation chamber 54 and is connected to the screw block 56.

The working principle and the beneficial effects of the technical scheme are as follows:

the second motor 65 synchronously drives the screw 55 to rotate in the screw block mounting chamber 54, so as to drive the screw block 56 sleeved on the screw 55 to move downwards, the screw block 56 pulls the rope body 57, the rope body 57 pulls the rope winding wheel 53 to rotate, so that the turning plate mounting shaft 69 is turned, the turning plate mounting shaft 69 drives the turning plate 60 to turn in the turning plate mounting groove, the included angle between the two turning plates 60 is reduced, and thus when the folding arm 34 turns from the initial working position to the second working position, the top end of the turning plate 60 can always support the central position of the lower surface of the outer protection layer plate 1.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.