阅读说明：本技术 一种吸塑模流速调整装置 (Flow velocity adjusting device for plastic uptake mold ) 是由 毛贵汉 毛可利 尹桂新 张�林 李日昂 刘满章 于 2020-12-30 设计创作，主要内容包括：本申请公开了一种吸塑模流速调整装置,包括管胚吸塑模主体(1),管胚吸塑模主体(1)内设置有若干空心管状的主芯轴(2),主芯轴(2)之间平行设置,主芯轴(2)与管胚吸塑模主体(1)滑动连接,主芯轴(2)内设置有吸塑管(3),吸塑管(3)套接于主芯轴(2)内并与主芯轴(2)共轴设置；所述的主芯轴(2)的下端突出于管胚吸塑模主体(1)的下端面,管胚吸塑模主体(1)的下端固定连接有内部中空的成型口模(4),主芯轴(2)的下端套接于成型口模(4)内且主芯轴(2)的下段外表面与成型口模(4)的内表面之间设置有间隔设置并形成下部流道。本发明的优点在于它能克服现有技术的弊端,结构设计合理新颖。(The application discloses a plastic uptake mould flow velocity adjusting device, which comprises a pipe blank plastic uptake mould main body (1), wherein a plurality of hollow tubular main mandrels (2) are arranged in the pipe blank plastic uptake mould main body (1), the main mandrels (2) are arranged in parallel, the main mandrels (2) are in sliding connection with the pipe blank plastic uptake mould main body (1), plastic uptake pipes (3) are arranged in the main mandrels (2), and the plastic uptake pipes (3) are sleeved in the main mandrels (2) and are coaxially arranged with the main mandrels (2); the lower end of the main mandrel (2) protrudes out of the lower end face of the pipe blank plastic uptake mould body (1), the lower end of the pipe blank plastic uptake mould body (1) is fixedly connected with a hollow forming opening mould (4), the lower end of the main mandrel (2) is sleeved in the forming opening mould (4), and a lower runner is arranged between the outer surface of the lower section of the main mandrel (2) and the inner surface of the forming opening mould (4) at intervals and is formed. The invention has the advantages that the defects in the prior art can be overcome, and the structural design is reasonable and novel.)

1. A suction mould flow velocity adjusting device is characterized in that: the pipe blank plastic uptake mould comprises a pipe blank plastic uptake mould main body (1), wherein a plurality of hollow tubular main mandrels (2) are arranged in the pipe blank plastic uptake mould main body (1), the main mandrels (2) are arranged in parallel, the main mandrels (2) are in sliding connection with the pipe blank plastic uptake mould main body (1), plastic uptake pipes (3) are arranged in the main mandrels (2), and the plastic uptake pipes (3) are sleeved in the main mandrels (2) and are coaxially arranged with the main mandrels (2); the lower end of the main mandrel (2) protrudes out of the lower end face of the pipe blank plastic uptake mould body (1), the lower end of the pipe blank plastic uptake mould body (1) is fixedly connected with a forming opening mould (4) with a hollow interior, the lower end of the main mandrel (2) is sleeved in the forming opening mould (4), and a lower runner is arranged between the outer surface of the lower section of the main mandrel (2) and the inner surface of the forming opening mould (4) at intervals and is formed; the upper end part of the main mandrel (2) protrudes out of the upper surface of the pipe blank plastic uptake mould main body (1), and the upper end of the pipe blank plastic uptake mould main body (1) is provided with two sliding push plates (5) which are arranged in parallel; the tube blank plastic uptake mould is characterized in that the sliding push plates (5) are strip-shaped plates and are arranged in parallel with the length extending direction of the main mandrel (2), the sliding push plates (5) slide on the tube blank plastic uptake mould main body (1) along the length extending direction of the sliding push plates (5), the main mandrel (2) is positioned between the two sliding push plates (5), the end parts of the two sliding push plates (5) are connected with a pushing power device, and a main mandrel pushing part is arranged between the upper end of the main mandrel (2) and the sliding push plates (5); when the pushing power device pushes the sliding push plate (5) to slide, the main mandrel pushing piece pushes the main mandrel (2) to slide relative to the pipe blank plastic uptake mold main body (1) along the length extending direction of the main mandrel (2).

2. The flow rate adjustment apparatus for a suction mold according to claim 1, wherein: two connecting blocks (6) are arranged between the two sliding push plates (5), and the two connecting blocks (6) are respectively fixedly connected with the end parts of the sliding push plates (5); the pushing power device comprises a pushing oil cylinder (7), the end part of a piston rod of the pushing oil cylinder (7) is fixedly connected with one connecting block (6), and the pushing direction of the piston rod of the pushing oil cylinder (7) is parallel to the length extending direction of the sliding push plate (5); the piston of the pushing oil cylinder (7) is fixed with the pipe blank plastic uptake mold main body (1).

3. The flow rate adjustment apparatus for a suction mold according to claim 1, wherein: an adjusting plate (8) is arranged above the pipe blank plastic uptake mould body (1), and the end part of the main mandrel (2) penetrates through the adjusting plate (8) and is fixedly connected with the adjusting plate (8); the main mandrel pushing piece comprises a plurality of pushing bearings (9), and the pushing bearings (9) are rotatably connected with the side parts of the adjusting plates (8) through rotating shafts; the sliding push plate (5) is provided with an inclination slide rail (10) which is matched with the pushing bearing (9), the length extending direction of the inclination slide rail (10) and the length extending direction of the main mandrel (2) are arranged in an acute angle included angle, and the pushing bearing (9) is arranged in the inclination slide rail (10) and is in rolling contact with the inner surface of the inclination slide rail (10).

4. The flow rate adjustment apparatus for a suction mold according to claim 1, wherein: the upper end of the pipe blank plastic uptake mould main body (1) is fixedly provided with two guide rail plates (11) which are arranged in parallel, two sliding push plates (5) are positioned between the two guide rail plates (11) and are in sliding fit with the guide rail plates (11), and the guide rail plates (11) are fixedly connected with the upper end of the pipe blank plastic uptake mould main body (1).

5. The flow rate adjustment apparatus for a suction mold according to claim 3, wherein: a guide post (12) is fixedly arranged at the upper end of the pipe blank suction mould main body (1), the guide post (12) is arranged in parallel to the length extending direction of the main mandrel (2), and the end part of the guide post (12) penetrates through the adjusting plate (8); the adjusting plate (8) is provided with a guide sleeve which is matched with the guide post (12), and the guide sleeve is in sliding fit with the guide post (12).

6. The flow rate adjustment apparatus for a suction mold according to claim 3, wherein: the end part of the main mandrel (2) penetrates through the adjusting plate (8) and is in threaded connection with an adjusting nut (14), a pressing block (15) is sleeved on the adjusting nut (14), and the pressing block (15) is fixed on the adjusting plate (8) through a bolt; an annular fixing ring (16) is arranged on the outer annular surface of the adjusting nut (14), and a groove matched with the fixing ring (16) is formed in the pressing block (15).

7. The flow rate adjustment apparatus for a suction mold according to claim 1, wherein: the lower end of the main mandrel (2) is conical, the inner surface of the forming opening mold (4) is conical and is matched with the outer surface of the lower end of the main mandrel (2), and a forming flow channel is formed between the outer surface of the lower end of the main mandrel (2) and the inner surface of the forming opening mold (4) at intervals.

8. The flow rate adjustment apparatus for a suction mold according to claim 1, wherein: an annular sealing ring (17) is sleeved at the middle section of the main mandrel (2), an annular extrusion cavity is formed between the annular inner surface of the sealing ring (17) and the outer surface of the main mandrel (2) at intervals, a feeding hole is formed in the side part of the tube blank plastic uptake mold main body (1), and the extrusion cavity is communicated with the feeding hole; the annular inner surface of the sealing ring (17) is provided with an annular extrusion bulge (18), the outer surface of the main mandrel (2) is provided with an annular bulge (19), the annular bulge (19) is positioned below the extrusion bulge (18), and the distance between the inner annular surface of the extrusion bulge (18) and the surface of the main mandrel (2) is smaller than the bulge height of the annular bulge (19).

9. The flow rate adjustment apparatus for a suction mold according to claim 1, wherein: a plurality of second annular bulges (20) are arranged on the outer surface of the lower section of the main mandrel (2), and the second annular bulges (20) are positioned below the second annular bulges (19) and are arranged at intervals with the second annular bulges (19); the annular outer ring surface of the second annular protrusion (20) and the inner wall of the pipe blank plastic uptake mold body (1) are arranged at intervals.

Technical Field

The invention relates to a flow velocity adjusting device for a plastic suction mould, and belongs to the field of plastic suction moulds.

Background

The plastic uptake is also called hollow plastic uptake, and is a plastic processing method with rapid development. The blister process began during world war ii to produce low density polyethylene vials. In the later 50 s, the blister technology has been widely used with the birth of high density polyethylene and the development of blister forming machines. The volume of the hollow container can reach thousands of liters, and computer control is adopted in some production. The plastics suitable for plastic uptake include polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the obtained hollow container is widely used as an industrial packaging container. According to the parison production method, plastics suction can be classified into extrusion plastics suction and injection plastics suction, and newly developed are multilayer plastics suction and stretch plastics suction. In the prior art, a plurality of plastic suction molding cavities formed by matching a main mandrel and a molding die are generally arranged in a pipe blank plastic suction mold to improve the production efficiency. However, when the adjustment device is adjusted to meet the production requirements of pipe blanks with different wall thicknesses, the single main mandrel and the forming neck ring die need to be adjusted, and when the main mandrel and the forming neck ring die need to be adjusted to adjust the wall thicknesses of the pipe blanks in the production cycle, the single main mandrel and the forming neck ring die also need to be adjusted, so that the adjustment is inconvenient, and the processing efficiency is affected.

Disclosure of Invention

The technical scheme of the invention aims at the following problems in the prior art: however, when the device is adjusted to meet the production requirements of pipe blanks with different wall thicknesses, a single main mandrel and a single forming neck ring die need to be adjusted, and when the main mandrel and the forming neck ring die need to be adjusted to adjust the wall thicknesses of the pipe blanks in a production cycle, the single main mandrel and the single forming neck ring die need to be adjusted, so that the adjustment is inconvenient and the processing efficiency is influenced.

In order to solve the technical problems, the invention adopts the technical scheme that the device for adjusting the flow speed of the plastic uptake mold comprises a pipe blank plastic uptake mold main body, wherein a plurality of hollow tubular main mandrels are arranged in the pipe blank plastic uptake mold main body, the main mandrels are arranged in parallel, the main mandrels are connected with the pipe blank plastic uptake mold main body in a sliding manner, plastic uptake pipes are arranged in the main mandrels, and the plastic uptake pipes are sleeved in the main mandrels and are coaxially arranged with the main mandrels; the lower end of the main mandrel protrudes out of the lower end face of the pipe blank plastic uptake mold main body, the lower end of the pipe blank plastic uptake mold main body is fixedly connected with a forming mouth mold with a hollow interior, the lower end of the main mandrel is sleeved in the forming mouth mold, and a lower runner is arranged between the outer surface of the lower section of the main mandrel and the inner surface of the forming mouth mold at intervals and formed; the upper end part of the main mandrel protrudes out of the upper surface of the pipe blank plastic uptake mould main body, and the upper end of the pipe blank plastic uptake mould main body is provided with two sliding push plates which are arranged in parallel; the sliding push plates are strip-shaped plates and are arranged in parallel with the length extending direction of the main mandrel, the sliding push plates slide on the tube blank plastic uptake mould main body along the length extending direction of the sliding push plates, the main mandrel is positioned between the two sliding push plates, the end parts of the two sliding push plates are connected with a pushing power device, and a main mandrel pushing part is arranged between the upper end of the main mandrel and the sliding push plates; when the pushing power device pushes the sliding push plate to slide, the main mandrel pushing piece pushes the main mandrel to slide relative to the pipe blank plastic uptake mold body along the length extension direction of the main mandrel.

Among the technical scheme of this application, slide main dabber and set up in the pipe embryo plastic uptake main part, when promotion power device drives the slip push pedal and slides, main dabber propelling part removes and makes main dabber remove along with the slip push pedal, and the removal through main dabber makes the clearance between main dabber lower extreme and the shaping bush change to can promote whole main dabbers and go up and down simultaneously when making the slip push pedal remove, make things convenient for whole main dabbers of synchronization adjustment. Two sliding push plates are respectively arranged on two sides of the main mandrel and keep synchronous motion, so that the main mandrel is prevented from deviating due to uneven moving distance of the two sides when moving.

Preferably, in the flow velocity adjusting device for the plastic uptake mold, two connecting blocks are arranged between the two sliding push plates, and the two connecting blocks are respectively and fixedly connected with the end parts of the sliding push plates; the pushing power device comprises a pushing oil cylinder, the end part of a piston rod of the pushing oil cylinder is fixedly connected with one connecting block, and the pushing direction of the piston rod of the pushing oil cylinder is parallel to the length extending direction of the sliding push plate; the piston of the pushing oil cylinder is fixed with the pipe blank plastic sucking mould main body.

In this application, use the tip of two connecting blocks support and two fixed sliding push plate for two sliding push plate connect to be a holistic frame, make two sliding push plate can keep the same amount of movement when removing, and then both sides atress keeps evenly when making main dabber go up and down. The pushing oil cylinder is used as a pushing power device, so that smaller displacement can be pushed, and fine adjustment can be conveniently realized.

Preferably, the flow velocity adjusting device of the suction mould is characterized in that an adjusting plate is arranged above the pipe blank suction mould body, and the end part of the main mandrel penetrates through the adjusting plate and is fixedly connected with the adjusting plate; the main mandrel pushing piece comprises a plurality of pushing bearings, and the pushing bearings are rotatably connected with the side parts of the adjusting plates through rotating shafts; the sliding push plate is provided with an inclination slide rail matched with the pushing bearing, the length extending direction of the inclination slide rail and the length extending direction of the main core shaft are arranged at an acute angle, and the pushing bearing is arranged in the inclination slide rail and is in rolling contact with the inner surface of the inclination slide rail.

In this application, the regulating plate is with the tip fixed connection of whole main dabber for main dabber keeps synchronous adjustment range when removing, guarantees the uniformity of adjustment range. The in-process that the sliding push plate was promoted, the promotion bearing of regulating plate both sides rolls in the inclination slide rail in the sliding push plate, because the length extending direction of inclination slide rail is acute angle contained angle setting with the length extending direction of main dabber, promotes the bearing and keeps fixing on horizontal going up and down along with the inclination slide rail, and then makes the regulating plate drive main dabber and goes up and down when the sliding push plate removes to can keep the range of adjustment of each main dabber unanimous.

Preferably, in the above apparatus for adjusting the flow rate of the plastic uptake mold, two guide rail plates arranged in parallel are fixedly disposed at the upper end of the main body of the tube blank plastic uptake mold, the two sliding push plates are disposed between the two guide rail plates and slidably engaged with the guide rail plates, and the guide rail plates are fixedly connected to the upper end of the main body of the tube blank plastic uptake mold.

In this application, through the moving direction of the guide rail board restriction slip push pedal, prevent that the slip push pedal from taking place the skew when removing, Zhao just slides the removal precision of push pedal, and then makes the adjustment precision of main dabber can guarantee.

Preferably, in the device for adjusting the flow rate of the plastic uptake mold, a guide pillar is fixedly arranged at the upper end of the tube blank plastic uptake mold body, the guide pillar is arranged in parallel to the length extension direction of the main mandrel, and the end part of the guide pillar penetrates through the adjusting plate; the adjusting plate is provided with a guide sleeve which is matched with the guide pillar, and the guide sleeve is in sliding fit with the guide pillar.

In this application, sliding fit through guide pillar and guide pin bushing makes the regulating plate keep along the length extending direction of main dabber when removing, has improved the moving accuracy of regulating plate when driving main dabber and removing, and then makes the adjustment accuracy of main dabber guarantee.

Preferably, in the flow velocity adjusting device for the plastic suction mold, the end part of the main mandrel penetrates through the adjusting plate and is in threaded connection with an adjusting nut, the adjusting nut is sleeved with a pressing block, and the pressing block is fixed on the adjusting plate through a bolt; an annular fixing ring is arranged on the outer annular surface of the adjusting nut, and a groove matched with the fixing ring is formed in the pressing block.

In this application, can make single main dabber take place to remove through rotatory adjusting nut, can finely tune single main dabber, adjusting nut is fixed in on the regulating plate through the briquetting, makes main dabber and adjusting nut's position can fix.

Preferably, in the above apparatus for adjusting the flow rate of the plastic uptake mold, the lower end of the main mandrel is conical, the inner surface of the molding die is conical and is disposed in cooperation with the outer surface of the lower end of the main mandrel, and the outer surface of the lower end of the main mandrel and the inner surface of the molding die are spaced apart from each other to form a molding flow channel.

In this application, the lower extreme of main dabber and shaping mouth mould internal surface are conical, and axial displacement through main dabber can conveniently adjust the off-the-shelf thickness of pipe.

Preferably, the flow velocity adjusting device of the suction mold comprises a main mandrel, a ring-shaped sealing ring is sleeved at the middle section of the main mandrel, a ring-shaped extrusion cavity is formed between the ring-shaped inner surface of the sealing ring and the outer surface of the main mandrel at intervals, a feed port is arranged at the side part of the main body of the tube blank suction mold, and the extrusion cavity is communicated with the feed port; the annular inner surface of the sealing ring is provided with an annular extrusion bulge, the outer surface of the main mandrel is provided with an annular bulge, the annular bulge is positioned below the extrusion bulge, and the distance between the inner annular surface of the extrusion bulge and the surface of the main mandrel is smaller than the height of the annular bulge.

When the clearance between the lower end of the main mandrel and the forming neck ring mold is increased, the flow velocity of the material flow is increased due to the increase of the flow channel area of the material flow, the impact force of the material flow on the main mandrel and the forming neck ring mold is increased, and the main mandrel and the forming neck ring mold are easily damaged. In this application, when making the lower extreme of main dabber and the clearance of shaping bush increase when main dabber removes, take place relative movement between annular arch and the extrusion arch and make annular arch and extrusion arch between the relative distance reduce, material flows flow area reduces and makes the material stream obtain the buffering, reduces the impact force of material stream to main dabber and shaping bush.

Preferably, the outer surface of the lower section of the main mandrel is provided with a plurality of second annular bulges, and the second annular bulges are positioned below the second annular bulges and are arranged at intervals with the second annular bulges; the annular outer ring surface of the annular protrusion II and the inner wall of the pipe blank plastic uptake mold main body are arranged at intervals.

Annular protruding two in this application has played the purpose that reduces the material and has flowed the velocity, further reduces the impact force of material stream to main dabber and shaping bush.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

fig. 3 is an enlarged view of fig. 2 at a.

Detailed Description

The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

As shown in the figures, the invention relates to a flow velocity adjusting device of a plastic uptake mould, which comprises a pipe blank plastic uptake mould main body 1, wherein a plurality of hollow tubular main mandrels 2 are arranged in the pipe blank plastic uptake mould main body 1, the main mandrels 2 are arranged in parallel, the main mandrels 2 are connected with the pipe blank plastic uptake mould main body 1 in a sliding way, plastic uptake pipes 3 are arranged in the main mandrels 2, and the plastic uptake pipes 3 are sleeved in the main mandrels 2 and are coaxially arranged with the main mandrels 2; the lower end of the main mandrel 2 protrudes out of the lower end face of the tube blank plastic uptake mold main body 1, the lower end of the tube blank plastic uptake mold main body 1 is fixedly connected with a forming neck mold 4 with a hollow interior, the lower end of the main mandrel 2 is sleeved in the forming neck mold 4, and a lower runner is formed between the outer surface of the lower section of the main mandrel 2 and the inner surface of the forming neck mold 4 at intervals; the upper end part of the main mandrel 2 protrudes out of the upper surface of the pipe blank plastic uptake mould body 1, and the upper end of the pipe blank plastic uptake mould body 1 is provided with two sliding push plates 5 which are arranged in parallel; the sliding push plates 5 are strip-shaped plates and are arranged in parallel with the length extending direction of the main mandrel 2, the sliding push plates 5 slide on the tube blank plastic uptake mould main body 1 along the length extending direction of the sliding push plates 5, the main mandrel 2 is positioned between the two sliding push plates 5, the end parts of the two sliding push plates 5 are connected with a pushing power device, and a main mandrel pushing part is arranged between the upper end of the main mandrel 2 and the sliding push plates 5; when the pushing power device pushes the sliding push plate 5 to slide, the main mandrel pushing piece pushes the main mandrel 2 to slide relative to the pipe blank plastic uptake mold body 1 along the length extending direction of the main mandrel 2.

Among the technical scheme of this application, slide main dabber 2 and set up in pipe embryo plastic uptake mould main part 1, when promotion power device drives the slip push pedal 5 and slides, main dabber propelling part removes and makes main dabber 2 remove along with slip push pedal 5, the removal through main dabber 2 makes the clearance between 2 lower extremes of main dabber and the shaping bush 4 change, thereby can promote whole main dabber 2 and go up and down simultaneously when making the slip push pedal 5 remove, make things convenient for whole main dabber 2 of synchro-adjustment. Two sliding push plates 5 are respectively arranged on two sides of the main mandrel 2 and keep synchronous motion, so that the main mandrel 2 is prevented from deviating due to uneven moving distance of the two sides when moving.

Two connecting blocks 6 are arranged between the two sliding push plates 5, and the two connecting blocks 6 are respectively fixedly connected with the end parts of the sliding push plates 5; the pushing power device comprises a pushing oil cylinder 7, the end part of a piston rod of the pushing oil cylinder 7 is fixedly connected with one connecting block 6, and the pushing direction of the piston rod of the pushing oil cylinder 7 is parallel to the length extending direction of the sliding push plate 5; the piston of the pushing oil cylinder 7 is fixed with the pipe blank plastic uptake mold main body 1.

In this application, use two connecting blocks 6 to support and fix the tip of two sliding push plate 5 for two sliding push plate 5 connect to be a holistic frame, make two sliding push plate 5 can keep the same amount of movement when removing, and then both sides atress keeps even when making main dabber 2 go up and down. The pushing oil cylinder 7 serves as a pushing power device and can push smaller displacement, and fine adjustment is conveniently achieved.

An adjusting plate 8 is arranged above the pipe blank suction mould main body 1, and the end part of the main mandrel 2 penetrates through the adjusting plate 8 and is fixedly connected with the adjusting plate 8; the main mandrel pushing piece comprises a plurality of pushing bearings 9, and the pushing bearings 9 are rotatably connected with the side parts of the adjusting plates 8 through rotating shafts; the sliding push plate 5 is provided with an inclination slide rail 10 which is matched with the pushing bearing 9, the length extending direction of the inclination slide rail 10 and the length extending direction of the main mandrel 2 form an acute included angle, and the pushing bearing 9 is arranged in the inclination slide rail 10 and is in rolling contact with the inner surface of the inclination slide rail 10.

In this application, the tip fixed connection of regulating plate 8 with whole main dabber 2 for main dabber 2 keeps synchronous adjustment range when removing, guarantees the uniformity of adjustment range. The in-process that the sliding push plate 5 was promoted, the promotion bearing 9 of 8 both sides of regulating plate rolls in the inclination slide rail 10 on the sliding push plate 5, because the length extending direction of inclination slide rail 10 is acute angle contained angle setting with the length extending direction of main dabber 2, promote bearing 9 when sliding push plate 5 removes and keep fixing on horizontal along with inclination slide rail 10 lift, and then make regulating plate 8 drive main dabber 2 go up and down, and can keep the adjustment range of each main dabber 2 unanimous.

The upper end of the pipe blank plastic uptake mould main body 1 is fixedly provided with two guide rail plates 11 which are arranged in parallel, the two sliding push plates 5 are positioned between the two guide rail plates 11 and are in sliding fit with the guide rail plates 11, and the guide rail plates 11 are fixedly connected with the upper end of the pipe blank plastic uptake mould main body 1.

In this application, through the moving direction of guide rail plate 11 restriction slip push pedal 5, prevent that slip push pedal 5 from taking place the skew when removing, Zhao just slides push pedal 5's removal precision, and then makes the adjustment precision of main dabber 2 guarantee.

A guide post 12 is fixedly arranged at the upper end of the pipe blank suction mould main body 1, the guide post 12 is arranged in parallel to the length extending direction of the main mandrel 2, and the end part of the guide post 12 penetrates through the adjusting plate 8; the adjusting plate 8 is provided with a guide sleeve which is matched with the guide post 12, and the guide sleeve is in sliding fit with the guide post 12.

In this application, sliding fit through guide pillar 12 and guide pin bushing makes regulating plate 8 keep along the length extending direction of main dabber 2 when removing, has improved the removal precision when regulating plate 8 drives main dabber 2 and removes, and then makes the adjustment precision of main dabber 2 guarantee.

The end part of the main mandrel 2 penetrates through the adjusting plate 8 and is in threaded connection with an adjusting nut 14, a pressing block 15 is sleeved on the adjusting nut 14, and the pressing block 15 is fixed on the adjusting plate 8 through a bolt; an annular fixing ring 16 is arranged on the outer annular surface of the adjusting nut 14, and a groove matched with the fixing ring 16 is arranged in the pressing block 15.

In this application, can make single main dabber 2 take place to remove through rotatory adjusting nut 14, can finely tune single main dabber 2, adjusting nut 14 is fixed in on regulating plate 8 through briquetting 15 for main dabber 2 and adjusting nut 14's position can be fixed.

The lower extreme of main dabber 2 is conical, and the internal surface of shaping bush 4 is conical and sets up with the cooperation of the lower extreme surface of main dabber 2, and the interval sets up and forms the shaping runner between the lower extreme surface of main dabber 2 and the 4 internal surfaces of shaping bush.

In this application, the lower extreme of main dabber 2 and 4 internal surfaces of shaping bush are the taper shape, and axial displacement through main dabber 2 can conveniently adjust the off-the-shelf thickness of pipe.

An annular sealing ring 17 is sleeved at the middle section of the main mandrel 2, an annular extrusion cavity is formed between the annular inner surface of the sealing ring 17 and the outer surface of the main mandrel 2 at intervals, a feeding hole is formed in the side part of the tube blank plastic suction mould main body 1, and the extrusion cavity is communicated with the feeding hole; an annular extrusion bulge 18 is arranged on the annular inner surface of the sealing ring 17, an annular bulge 19 is arranged on the outer surface of the main mandrel 2, the annular bulge 19 is positioned below the extrusion bulge 18, and the distance between the inner annular surface of the extrusion bulge 18 and the surface of the main mandrel 2 is smaller than the bulge height of the annular bulge 19.

When the gap between the lower end of the main mandrel 2 and the forming neck ring mold 4 is increased, the flow velocity of the material flow is increased due to the increase of the flow channel area of the material flow, the impact force of the material flow on the main mandrel 2 and the forming neck ring mold 4 is increased, and the main mandrel 2 and the forming neck ring mold 4 are easily damaged. In this application, when main dabber 2 removed and make the lower extreme of main dabber 2 and the clearance of shaping bush 4 increase, annular is protruding 19 and takes place relative movement between the extrusion arch 18 and makes the annular protruding 19 and extrude the relative distance between the arch 18 reduce, and the material flows flow area reduces and makes the material flow obtain the buffering, reduces the impact force of material flow to main dabber 2 and shaping bush 4.

A plurality of second annular bulges 20 are arranged on the outer surface of the lower section of the main mandrel 2, and the second annular bulges 20 are positioned below the second annular bulges 19 and are arranged at intervals with the second annular bulges 19; the annular outer ring surface of the second annular protrusion 20 is arranged at intervals with the inner wall of the pipe blank plastic uptake mould body 1.

The second annular protrusion 20 in the present application serves the purpose of reducing the flow velocity of the material flow, and further reduces the impact force of the material flow on the main mandrel 2 and the molding die 4.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.