阅读说明：本技术 一种厚壁直缝焊管热处理装置及方法 (Thick-wall straight welded pipe heat treatment device and method ) 是由 楚志兵 杨博文 赵晓东 邬莉华 桂海莲 魏晓晋 于 2021-11-05 设计创作，主要内容包括：本发明属于热处理技术领域,具体涉及一种厚壁直缝焊管热处理装置及方法。一种厚壁直缝焊管热处理装置,包括放料装置、送料装置、热处理炉和冷却池；所述放料装置由多个并排安装的放料架组成；所述送料装置用于实现管材各个程序之间的运输；所述冷却池设置在放料装置的右侧,在所述冷却池内设置有承放架；本发明采用一号小车、二号小车以及送料架可以对焊管实现批量输送,提高了焊管的运输效率,同时相比于原有的喷淋冷却和空冷,本发明可以高效的消除厚壁焊管管体内部的残余应力,而采用冷却池冷却可以快速实现管材内部组织晶粒、析出相等快速定型,确保管体部分的力学性能一致性,同时可避免钢管发生弯曲、塌扁等不良变形现象。(The invention belongs to the technical field of heat treatment, and particularly relates to a heat treatment device and method for a thick-wall straight welded pipe. A heat treatment device for thick-wall straight welded pipes comprises a discharging device, a feeding device, a heat treatment furnace and a cooling pool; the discharging device consists of a plurality of discharging frames which are arranged side by side; the feeding device is used for realizing the transportation among all programs of the pipes; the cooling tank is arranged on the right side of the discharging device, and a bearing frame is arranged in the cooling tank; the first trolley, the second trolley and the feeding frame are adopted to realize batch conveying of the welded pipes, the conveying efficiency of the welded pipes is improved, and compared with the original spray cooling and air cooling, the residual stress in the thick-wall welded pipe body can be efficiently eliminated, the internal structure of the pipe body can be rapidly shaped by cooling in the cooling pool, the grain size and the precipitation phase in the pipe body can be rapidly established, the consistency of the mechanical properties of the pipe body part is ensured, and the undesirable deformation phenomena of bending, collapsing and the like of the steel pipe can be avoided.)

1. The utility model provides a thick wall straight welded pipe heat treatment device which characterized in that: comprises a discharging device (01), a feeding device (02), a heat treatment furnace (03) and a cooling pool (04);

the discharging device (01) is composed of a plurality of discharging frames (1) which are arranged side by side;

the feeding device (02) comprises a first guide rail (2) and a second guide rail (3) which are transversely placed, the first guide rail (2) and the second guide rail (3) are arranged on a foundation at the front side of the discharging device (01) side by side, a first trolley (4) is placed on the first guide rail (2) and the second guide rail (3) together, a first motor (5) is installed on the lower surface of the first trolley (4) and used for providing power for the movement of the first trolley (4), a third guide rail (6) and a fourth guide rail (7) are arranged on the upper surface of the first trolley (4) side by side, the third guide rail (6) and the fourth guide rail (7) are perpendicular to the first guide rail (2), the second trolley (8) is placed on the third guide rail (6) and the fourth guide rail (7) together, and a second motor (9) is arranged on the lower surface of the second trolley (8), the utility model provides a be used for the removal of No. two dolly (8) to provide power No. two dolly (8) upper surface's anterior an organic whole is provided with installation wall (10) be provided with dovetail block (11) on the medial surface of installation wall (10) the inboard of installation wall (10) is provided with portal (12) be provided with dovetail (13) corresponding with dovetail block (11) on portal (12), still vertically be provided with rack (14) on the medial surface of installation wall (10) install two pivot (15) of transversely placing through the bearing frame on portal (12) install gear (16) corresponding with rack (14) on pivot (15) still install No. three motor (17) on the lateral wall of portal (12) for drive pivot (15) drive gear (16) and rotate, thereby drive portal (12) and reciprocate, a plurality of feeding frames (18) are fixedly arranged at the lower part of the inner side surface of the door frame (12) through bolts, and a fifth guide rail (19) and a sixth guide rail (20) are respectively arranged at the left side and the right side of the feeding device (01), so that when the first trolley (4) runs to the left side, the fifth guide rail (19) and the sixth guide rail (20) are respectively connected with the third guide rail (6) and the fourth guide rail (7);

the cooling tank (04) is arranged on the right side of the discharging device (01), a bearing and discharging frame (21) is arranged in the cooling tank (04), two rows of first fixed pulleys (22) are arranged at the bottom of the bearing and discharging frame (21), second fixed pulleys (23) corresponding to the first fixed pulleys (22) are arranged on the left side and the right side of the bearing and discharging frame (21), third fixed pulleys (24) corresponding to the second fixed pulleys (23) are arranged at the upper ends of the left side wall and the right side of the cooling tank (04), fourth fixed pulleys (25) corresponding to the third fixed pulleys (24) are arranged on the foundation on the left side and the right side of the cooling tank (04), the first fixed pulleys (22), the second fixed pulleys (23), the third fixed pulleys (24) and the fourth fixed pulleys (25) which correspond to each other form a fixed pulley group, and an annular steel wire rope (26) passes through the two fixed pulley groups together, the left side and the right side of the annular steel wire rope (26) are respectively wound on different movable pulleys (27), the movable pulleys (27) are installed at the end part of a first hydraulic cylinder (28), the first hydraulic cylinder (28) is fixedly installed on a foundation, the first hydraulic cylinder (28) drives the movable pulleys (27) to move, and finally the annular steel wire rope (26) is driven to be tensioned or loosened, and finally the bearing and placing frame (21) is driven to move up and down;

the heat treatment furnace (03) comprises a furnace body (29), a furnace opening is formed in the furnace body (29), grooves (30) are formed in two sides of the furnace opening, a heating furnace door (31) is arranged at the furnace opening, sliders (32) corresponding to the grooves (30) are arranged on two sides of the heating furnace door (31), a connecting rod (33) is fixedly arranged above the heating furnace door (31), chains (34) are fixedly arranged at two ends of the connecting rod (33), a fixed chain wheel (35) is arranged right above a connecting part of the chains (34) and the connecting rod (33), the fixed chain wheel (35) is installed on the furnace body (29), reversing chain wheels (36) corresponding to the two chains (34) are installed on one side above the furnace body (29), a movable chain wheel (37) is arranged below the reversing chain wheel (36), and the movable chain wheel (37) is installed at the end part of a second hydraulic cylinder (38), the second hydraulic cylinder (38) is installed on the furnace body (29), and eight guide rails (39) are arranged on the right sides of the cooling pool (04) and the heat treatment furnace (03), so that the third guide rail (6) and the fourth guide rail (7) are respectively connected with the sixth guide rail (20) and the eight guide rails (39) when the first trolley (4) runs to the right side.

2. The thick-walled straight welded pipe heat treatment apparatus according to claim 1, characterized in that: the left end and the right end of the first guide rail (2) and the second guide rail (3) are respectively provided with a baffle (40) to prevent the first trolley (4) from excessively running, the front ends of the third guide rail (6) and the fourth guide rail (7) are respectively provided with a baffle (40), and the rear ends of the fifth guide rail (19), the sixth guide rail (20) and the eighth guide rail (39) are respectively provided with a baffle (40) to prevent the second trolley (8) from excessively running.

3. The heat treatment apparatus for the thick-walled straight welded pipe according to claim 2, wherein: flanges (41) are arranged on the outer sides of rolling wheels of the first trolley (4) and the second trolley (8) to limit the moving paths of the first trolley (4) and the second trolley (8) and ensure that the first trolley (4) and the second trolley (8) cannot deviate.

4. The heat treatment apparatus for the thick-walled straight welded pipe according to claim 3, wherein: the front side and the rear side of the bearing frame (21) are respectively provided with a roller (42), and the side wall of the cooling pool (04) is provided with a seven-number guide rail (43) corresponding to the rollers (42) so as to prevent the bearing frame (21) from shaking back and forth and reduce friction force.

5. The thick-walled straight welded pipe heat treatment apparatus according to claim 4, wherein: the sliding block (32) is a circular sliding block to reduce friction force.

6. A thick-walled straight welded pipe heat treatment apparatus according to claim 5, characterized in that: and a heat insulation layer (44) is arranged on the inner side surface of the door frame (12) and is used for insulating heat emitted after the heat treatment of the pipe, so that the safety of machines and personnel is protected.

7. The thick-walled straight welded pipe heat treatment apparatus according to claim 6, wherein: the heating furnace door is characterized in that a cooling pipeline is arranged inside the heating furnace door (31), a water outlet pipeline (45) and a water inlet pipeline (46) are respectively arranged on the left side and the right side of the upper surface of the heating furnace door (31), and the water outlet pipeline (45) and the water inlet pipeline (46) are both connected with the cooling pipeline.

8. A heat treatment method for a thick-walled straight welded pipe based on the heat treatment apparatus of claim 7, characterized in that: firstly, a second motor (9) works to drive a second trolley (8) to move from a third guide rail (6) and a fourth guide rail (7) to a fifth guide rail (19) and a sixth guide rail (20), when a feeding frame (18) on the second trolley (8) moves to the lower part of a discharging device (01), the second trolley stops, then a third motor (17) drives a rotating shaft (15) to drive a gear (16) to rotate, so that a gantry (12) is driven to move upwards, the material taking action from the discharging device (01) is completed, after the material taking is completed, the second motor (9) rotates reversely to drive the second trolley (8) to return to the first trolley (4), then a first motor (5) works to drive the first trolley (4) to move, so that the fourth guide rail (7) is connected with an eighth guide rail (39), then a second hydraulic cylinder (38) retracts, a heating furnace door (31) is opened, the second motor (9) works to drive the second trolley (8) to move, the third motor (17) is matched with the third motor to work, a welding pipe on the feeding frame (18) is placed into the furnace body (29), then the second hydraulic cylinder (38) extends out, the heating furnace door (31) is closed, after the welding pipe is heated, the second hydraulic cylinder (38) retracts, the heating furnace door (31) is opened, the second motor (9) and the third motor (17) control the second trolley (8) to drive the feeding frame (18) to take out the welding pipe from the furnace body (29) and retract to the rear side of the cooling pool (04), then the first hydraulic cylinder (28) retracts, the bearing frame (21) in the cooling pool (04) is lifted, the second motor (9) and the third motor (17) control the second trolley (8) to drive the feeding frame (18) to place the welding pipe on the bearing frame (21), then the welding pipe retracts to the first trolley (4), then the first hydraulic cylinder (28) extends out, the bearing frame (21) is placed in the cooling pool (04) to be cooled, and after cooling, the first hydraulic cylinder (28) retracts, the bearing frame (21) is lifted, and the heat treatment of the welded pipe is completed.

Technical Field

The invention belongs to the technical field of heat treatment, and particularly relates to a heat treatment device and method for a thick-wall straight welded pipe.

Background

Because the thick-wall straight welded pipe has the phenomenon of the Bauschinger effect and large residual stress in the forming process, in order to improve the performance of pipe body materials, improve the quality of pipes, realize the consistency of the performance of welding seams and the pipe body materials and avoid rusting of welding positions, the welded stainless steel pipe is generally subjected to heat treatment, so that the tissue structure of the welded stainless steel pipe is supersaturated solid solution or is usually only in a high-temperature solid solution phase, is in a metastable state in thermodynamics and can be subjected to desolvation or other transformations under the proper temperature or stress condition.

At present, when a steel pipe enters a furnace body, the steel pipe is generally conveyed directly by a roller way, passes through the heat treatment furnace at a certain speed to be subjected to organization property regulation and control treatment, and is sent out of the furnace body to be subjected to spray cooling or air cooling, and the biggest problem of the heat treatment mode is as follows: the pipe transportation efficiency is low, the cooling speed of the pipe body after heat treatment is low, the solid solution phase is difficult to realize rapid shaping, the expected requirement is difficult to achieve, the phenomenon is more prominent for large-diameter thick-wall pipes, the steel pipe is easy to deform, the subsequent processing is not facilitated, and even the steel pipe is scrapped. Therefore, the invention provides the heat treatment device for the thick-wall metal straight welded pipe, and the process technology matched with the heat treatment device is formed, so that the defects of the traditional equipment can be well overcome, and the production efficiency of a production line and the quality of products are effectively improved.

Disclosure of Invention

The invention provides a thick-wall straight welded pipe heat treatment device and method aiming at the problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a heat treatment device for thick-wall straight welded pipes comprises a discharging device, a feeding device, a heat treatment furnace and a cooling pool;

the discharging device consists of a plurality of discharging frames which are arranged side by side;

the feeding device comprises a first guide rail and a second guide rail which are transversely arranged, the first guide rail and the second guide rail are arranged on a foundation at the front side of the discharging device side by side, a first trolley is jointly placed on the first guide rail and the second guide rail, a first motor is installed on the lower surface of the first trolley and used for providing power for the movement of the first trolley, a third guide rail and a fourth guide rail are arranged on the upper surface of the first trolley side by side and perpendicular to the first guide rail, a second trolley is jointly placed on the third guide rail and the fourth guide rail, a second motor is arranged on the lower surface of the second trolley and used for providing power for the movement of the second trolley, a mounting wall is integrally arranged at the front part of the upper surface of the second trolley, a dovetail block is arranged on the inner side surface of the mounting wall, and a door frame is arranged on the inner side of the mounting wall, the feeding device comprises a door frame, a dovetail groove, a rack, a plurality of feeding frames, a feeding device and a feeding device, wherein the door frame is provided with a dovetail groove corresponding to a dovetail block, the inner side surface of the mounting wall is also vertically provided with the rack, the door frame is provided with two transversely placed rotating shafts through a bearing seat, the rotating shafts are provided with gears corresponding to the rack, the side wall of the door frame is also provided with a third motor for driving the rotating shafts to drive the gears to rotate so as to drive the door frame to move up and down, the lower part of the inner side surface of the door frame is fixedly provided with a plurality of feeding frames through bolts, and the left side and the right side of the feeding device are respectively provided with a fifth guide rail and a sixth guide rail so that the fifth guide rail and the sixth guide rail are respectively connected with the third guide rail and the fourth guide rail when a trolley runs to the left side;

the cooling tank is arranged on the right side of the discharging device, the cooling tank is internally provided with a bearing and discharging frame, the bottom of the bearing and discharging frame is provided with two rows of first fixed pulleys, the left side and the right side of the bearing and discharging frame are respectively provided with a second fixed pulley corresponding to the first fixed pulley, the upper ends of the left side wall and the right side wall of the cooling tank are respectively provided with a third fixed pulley corresponding to the second fixed pulley, the foundations on the left side and the right side of the cooling tank are provided with a fourth fixed pulley corresponding to the third fixed pulley, the first fixed pulley, the second fixed pulley, the third fixed pulley and the fourth fixed pulley which correspond to each other jointly form a fixed pulley group, an annular steel wire rope jointly penetrates through the two groups of fixed pulley groups, the left side and the right side of the annular steel wire rope are respectively wound on different movable pulleys, the movable pulleys are arranged at the end part of a hydraulic cylinder, and the hydraulic cylinder is fixedly arranged on the foundation, the first hydraulic cylinder drives the movable pulley to move, and finally drives the annular steel wire rope to be tensioned or loosened, and finally drives the bearing and placing frame to move up and down;

the heat treatment furnace comprises a furnace body, a furnace opening is arranged on the furnace body, grooves are arranged on two sides of the furnace opening, a heating furnace door is arranged at the furnace opening, sliding blocks corresponding to the grooves are arranged on two sides of the heating furnace door, a connecting rod is fixedly arranged above the heating furnace door, chains are fixedly arranged at two ends of the connecting rod, a fixed chain wheel is arranged right above the connecting part of the chains and the connecting rod, the fixed chain wheel is arranged on the furnace body, reversing chain wheels corresponding to the two chains are arranged on one side above the furnace body, a movable chain wheel is arranged below the reversing chain wheel, the movable chain wheel is arranged at the end part of a second hydraulic cylinder, the second hydraulic cylinder is arranged on the furnace body, eight guide rails are arranged on the right side of the cooling tank and the heat treatment furnace so as to facilitate the operation of a trolley to the right side, the third guide rail and the fourth guide rail are respectively connected with the sixth guide rail and the eighth guide rail.

Furthermore, both ends all are provided with the baffle about a guide rail and No. two guide rails to prevent a dolly excessive operation No. three the front end of guide rail and No. four guide rails all is provided with the baffle the rear end of No. five guide rails, No. six guide rails and No. eight guide rails all is provided with the baffle, in order to prevent No. two dolly excessive operations.

And furthermore, flanges are arranged on the outer sides of the rolling wheels of the first trolley and the second trolley to limit the moving paths of the first trolley and the second trolley and ensure that the first trolley and the second trolley cannot deviate.

Furthermore, rollers are arranged on the front side and the rear side of the bearing frame, and seven guide rails corresponding to the rollers are arranged on the side wall of the cooling pool, so that the bearing frame is prevented from shaking forwards and backwards, and meanwhile, the friction force is reduced.

Furthermore, the sliding block is a circular sliding block to reduce friction force.

Furthermore, a heat insulation layer is arranged on the inner side face of the door frame and used for isolating heat emitted after the heat treatment of the pipe, so that the safety of machines and personnel is protected.

Furthermore, a cooling pipeline is arranged inside the heating furnace door, a water outlet pipeline and a water inlet pipeline are respectively arranged on the left side and the right side of the upper surface of the heating furnace door, and the water outlet pipeline and the water inlet pipeline are both connected with the cooling pipeline.

A heat treatment method for thick-wall straight welded pipe includes such steps as moving the carriage to the guide rails, stopping when the carriage on carriage is moved to the position under the feeding unit, driving the rotary shaft to rotate the gear, moving the gantry upward to take the welded pipe from feeding unit, turning the carriage back to carriage, moving carriage to connect the guide rails, retracting the hydraulic cylinder, opening heating gate, moving carriage, and allowing the motor to move while the motor is engaged to put the welded pipe in furnace, extending hydraulic cylinder, closing heating gate, and retracting the hydraulic cylinder, opening the heating furnace door, controlling the second trolley by the second motor and the third motor to drive the feeding frame to take out the welded pipe from the furnace body and return to the rear side of the cooling pool, then retracting the first hydraulic cylinder to lift the bearing frame in the cooling pool, controlling the second trolley by the second motor and the third motor to drive the feeding frame to place the welded pipe on the bearing frame, returning to the first trolley, extending the first hydraulic cylinder out, placing the bearing frame into the cooling pool to be cooled, retracting the first hydraulic cylinder after cooling, lifting the bearing frame, and completing the heat treatment of the welded pipe.

Compared with the prior art, the invention has the following advantages:

the first trolley, the second trolley and the feeding frame are adopted to realize batch conveying of the welded pipes, the conveying efficiency of the welded pipes is improved, and compared with the original spray cooling and air cooling, the residual stress in the thick-wall welded pipe body can be efficiently eliminated, the internal structure of the pipe body can be quickly formed, the grain size can be quickly separated out, the same quick forming can be quickly realized, the consistency of the mechanical properties of the pipe body part can be ensured, the bad deformation phenomena of bending, collapsing and the like of the steel pipe can be avoided, and the key indexes of the pipe body, the appearance size and the like can be ensured to meet the use requirements.

Drawings

FIG. 1 is a top view of the present invention;

FIG. 2 is a schematic structural diagram of the discharging frame according to the present invention;

FIG. 3 is a left side view of the cart I and cart II of the present invention;

FIG. 4 is a rear view of the cart I and cart II of the present invention;

FIG. 5 is a top view of cart II of the present invention;

FIG. 6 is an enlarged view of a portion of circle A of FIG. 3 in accordance with the present invention;

FIG. 7 is a front view of the carrier of the present invention;

FIG. 8 is a side view of the carrier of the present invention;

FIG. 9 is a top view of the cooling bath of the present invention;

FIG. 10 is a front view of the heat treatment furnace of the present invention.

Detailed Description

In order to further illustrate the technical solution of the present invention, the present invention is further illustrated by the following examples.

As shown in fig. 1 to 10, a thick-wall straight welded pipe heat treatment device comprises a discharging device 01, a feeding device 02, a heat treatment furnace 03 and a cooling pool 04;

the discharging device 01 consists of a plurality of discharging frames 1 which are arranged side by side;

the feeding device 02 comprises a first guide rail 2 and a second guide rail 3 which are transversely arranged, the first guide rail 2 and the second guide rail 3 are arranged on a foundation at the front side of the discharging device 01 side by side, a first trolley 4 is jointly placed on the first guide rail 2 and the second guide rail 3, baffles 40 are arranged at the left end and the right end of the first guide rail 2 and the second guide rail 3 respectively to prevent the first trolley 4 from excessively running, a first motor 5 is arranged on the lower surface of the first trolley 4 and used for providing power for the movement of the first trolley 4, a third guide rail 6 and a fourth guide rail 7 are arranged on the upper surface of the first trolley 4 side by side, the third guide rail 6 and the fourth guide rail 7 are perpendicular to the first guide rail 2, a second trolley 8 is jointly placed on the third guide rail 6 and the fourth guide rail 7, the baffles 40 are arranged at the front ends of the third guide rail 6 and the fourth guide rail 7 respectively, the lower surface of the second trolley 8 is provided with a second motor 9 for providing power for the movement of the second trolley 8, the front part of the upper surface of the second trolley 8 is integrally provided with an installation wall 10, the inner side surface of the installation wall 10 is provided with a dovetail block 11, the inner side of the installation wall 10 is provided with a door frame 12, the inner side surface of the door frame 12 is provided with a heat insulation layer 44 for isolating heat emitted after the heat treatment of the pipe, so as to protect the safety of machines and personnel, the door frame 12 is provided with a dovetail groove 13 corresponding to the dovetail block 11, the inner side surface of the installation wall 10 is also vertically provided with a rack 14, the door frame 12 is provided with two rotating shafts 15 which are transversely arranged through bearing seats, the rotating shafts 15 are provided with gears 16 corresponding to the rack 14, and the side walls of the door frame 12 are also provided with a third motor 17, the material feeding device is used for driving a rotating shaft 15 to drive a gear 16 to rotate so as to drive a portal 12 to move up and down, a plurality of material feeding frames 18 are fixedly installed at the lower part of the inner side surface of the portal 12 through bolts, a fifth guide rail 19 and a sixth guide rail 20 are respectively arranged on the left side and the right side of the material feeding device 01 so that a first trolley 4 can run to the left side, the fifth guide rail 19 and the sixth guide rail 20 are respectively connected with a third guide rail 6 and a fourth guide rail 7, baffle plates 40 are respectively arranged at the rear ends of the fifth guide rail 19, the sixth guide rail 20 and an eighth guide rail 39 so as to prevent the second trolley 8 from running excessively, flanges 41 are respectively arranged on the outer sides of rolling wheels of the first trolley 4 and the second trolley 8 so as to limit the moving paths of the first trolley 4 and the second trolley 8 and ensure that the first trolley 4 and the second trolley 8 cannot deviate;

the cooling pool 04 is arranged on the right side of the emptying device 01, a bearing frame 21 is arranged in the cooling pool 04, two rows of first fixed pulleys 22 are arranged at the bottom of the bearing frame 21, second fixed pulleys 23 corresponding to the first fixed pulleys 22 are arranged on the left side and the right side of the bearing frame 21, third fixed pulleys 24 corresponding to the second fixed pulleys 23 are arranged at the upper ends of the left side wall and the right side wall of the cooling pool 04, fourth fixed pulleys 25 corresponding to the third fixed pulleys 24 are arranged on the foundation on the left side and the right side of the cooling pool 04, the first fixed pulleys 22, the second fixed pulleys 23, the third fixed pulleys 24 and the fourth fixed pulleys 25 which correspond to each other form a fixed pulley block together, an annular steel wire rope 26 passes through the two groups of fixed pulley blocks together, the left side and the right side of the annular steel wire rope 26 are wound on different movable pulleys 27 respectively, the movable pulleys 27 are arranged at the end part of a hydraulic cylinder 28, the first hydraulic cylinder 28 is fixedly installed on a foundation, the first hydraulic cylinder 28 drives the movable pulley 27 to move, and finally drives the annular steel wire rope 26 to be tensioned or loosened, and finally drives the bearing frame 21 to move up and down, the front side and the rear side of the bearing frame 21 are both provided with the idler wheels 42, and the side wall of the cooling pool 04 is provided with a seventh guide rail 43 corresponding to the idler wheels 42 so as to prevent the bearing frame 21 from shaking back and forth and reduce friction force;

the heat treatment furnace 03 comprises a furnace body 29, a furnace mouth is arranged on the furnace body 29, grooves 30 are arranged on two sides of the furnace mouth, a heating furnace door 31 is arranged on the furnace mouth, a cooling pipeline is arranged in the heating furnace door 31, a water outlet pipeline 45 and a water inlet pipeline 46 are respectively arranged on the left side and the right side of the upper surface of the heating furnace door 31, the water outlet pipeline 45 and the water inlet pipeline 46 are both connected with the cooling pipeline, sliders 32 corresponding to the grooves 30 are arranged on two sides of the heating furnace door 31, the sliders 32 are circular sliders to reduce friction force, a connecting rod 33 is fixedly arranged above the heating furnace door 31, chains 34 are fixedly arranged at two ends of the connecting rod 33, a fixed chain wheel 35 is arranged right above the connecting part of the chains 34 and the connecting rod 33, the fixed chain wheel 35 is arranged on the furnace body 29, a reversing chain wheel 36 corresponding to the two chains 34 is arranged on one side above the furnace body 29, a movable chain wheel 37 is arranged below the reversing chain wheel 36, the movable chain wheel 37 is arranged at the end part of a second hydraulic cylinder 38, the second hydraulic cylinder 38 is arranged on the furnace body 29, and eight guide rails 39 are arranged on the right sides of the cooling pool 04 and the heat treatment furnace 03, so that the third guide rail 6 and the fourth guide rail 7 are respectively connected with the sixth guide rail 20 and the eight guide rail 39 when the first trolley 4 runs to the right side.

A heat treatment method for thick-wall straight welded pipes comprises the steps that firstly, a second motor 9 works to drive a second trolley 8 to move from a third guide rail 6 and a fourth guide rail 7 to a fifth guide rail 19 and a sixth guide rail 20, when a feeding frame 18 on the second trolley 8 moves to the position below a discharging device 01, the second motor 17 stops driving a rotating shaft 15 to drive a gear 16 to rotate, so that a door frame 12 is driven to move upwards, the discharging action from the discharging device 01 is completed, after the discharging action is completed, the second motor 9 rotates reversely to drive the second trolley 8 to return to a first trolley 4, then the first motor 5 works to drive the first trolley 4 to move, so that the fourth guide rail 7 is connected with an eighth guide rail 39, then a second hydraulic cylinder 38 retracts, a heating furnace door 31 is opened, the second motor 9 works to drive the second trolley 8 to move, the third motor 17 works in cooperation with the third motor to place welded pipes on the feeding frame 18 into a furnace body 29, then the second hydraulic cylinder 38 extends out, the heating furnace door 31 is closed, after the welded pipe is heated, the second hydraulic cylinder 38 retracts, the heating furnace door 31 is opened, the second motor 9 and the third motor 17 control the second trolley 8 to drive the feeding frame 18 to take the welded pipe out of the furnace body 29 and retract to the rear side of the cooling pool 04, then the first hydraulic cylinder 28 retracts to lift the bearing frame 21 in the cooling pool 04, the second motor 9 and the third motor 17 control the second trolley 8 to drive the feeding frame 18 to place the welded pipe on the bearing frame 21 and then retract to the first trolley 4, then the first hydraulic cylinder 28 extends out, the bearing frame 21 is placed in the cooling pool 04 to be cooled, after cooling, the first hydraulic cylinder 28 retracts, the bearing frame 21 is lifted, and heat treatment of the welded pipe is completed.

While there have been shown and described what are at present considered to be the essential features and advantages of the invention, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.