A production process for serpentine tubes with high forming quality

Abstract

The present application relates to a high-quality serpentine tube production process, which belongs to the field of serpentine tube production technology, and adopts a tube bending processing equipment, and its process flow includes: unloading, starting equipment, bending processing, manual material transfer, and repeated processing operations. During the processing, except for the part being bent, the unprocessed part of the steel tube blank is relatively fixed to the frame, the processed part is relatively fixed to the processing table, and the overall moving direction of the steel tube is horizontal. The involuntary deformation of the steel tube blank during the whole process is small, and it has a high forming quality.

Description

Technical Field

[0001] The present application relates to the field of serpentine tubes, and in particular to a production process for serpentine tubes with high molding quality. Background Art

[0002] A serpentine tube is a tube that meanders multiple times in a plane. It is widely used in thermal equipment. The convection heating surfaces of boilers, such as economizers, superheaters and reheaters, mostly adopt a serpentine tube structure, which can be arranged in horizontal and vertical ways.

[0003] The pipe bending machine is a cold processing equipment used to produce special-shaped pipes such as U-shaped pipes and serpentine pipes. In the relevant technology, the pipe bending machine includes a propulsion mechanism and a bending mechanism. The bending mechanism is provided with a processing table that can rotate relative to the propulsion mechanism. The processing table is provided with a clamp. The clamp clamps the steel pipe. The processing table rotates to bend the steel pipe, thereby forming a curved structure of the steel pipe. For serpentine pipes, a single steel pipe needs to be bent repeatedly many times. When the bending section after the second section is formed, the processed part is driven by the processing table as a whole and rotates with it. The center of rotation is the center of rotation of the processing table. In order to reduce the friction damage to the steel pipe, manual operation is required during bending to provide auxiliary support for the rotating part of the steel pipe.

[0004] According to the principle of leverage, when the length of a single straight pipe section on the steel pipe is large, the rotating part of the steel pipe will be subjected to a large torque generated by gravity, and as the number of bending times increases, it becomes increasingly difficult for the operator to support and assist the processed part of the steel pipe, which can easily cause serious deformation of this part of the steel pipe, causing inconvenience for subsequent operations such as steel pipe correction and adjustment, and ultimately affecting the product yield or product quality. Summary of the invention

[0005] In order to improve the above problems, the present application provides a serpentine tube production process with high molding quality.

[0006] The present application provides a high-quality serpentine tube production process using the following technical solutions:

[0007] A process for producing a serpentine tube with high molding quality comprises the following steps in sequence:

[0008] S1: placing a steel pipe blank into a pipe bending processing device, wherein the pipe bending processing device comprises a frame and a processing table, and the processing table and the frame are movably connected;

[0009] S2: bending the steel tube billet to form a straight tube section and a bent portion, wherein two opposite sections of the bent portion are respectively connected to two adjacent straight tube sections, and the length directions of the two adjacent straight tube sections are parallel;

[0010] S3: a clamping piece is arranged on the steel pipe blank and between two adjacent straight pipe sections, wherein the clamping piece abuts against the pipe walls of the two adjacent straight pipe sections and is connected to the processing table;

[0011] S4: Repeat S2 and S3 until the serpentine tube processing is completed.

[0012] By adopting the above technical scheme, a pair of adjacent straight pipe sections are clamped by the clamping plates each time the bending is performed, and the clamping plates are connected to the processing table, which indirectly allows the processed steel pipe blank and the processing table to maintain a relatively stable position state, and the pipe material of the formed steel pipe blank part is not prone to a large degree of deformation, thereby improving the product molding quality and yield rate in the overall production process of the serpentine pipe.

[0013] Preferably, the processing table is slidably connected to the frame, and a bending table is also slidably connected to the frame, the sliding direction of the bending table is consistent with the sliding direction of the processing table, the bending table is located between the frame and the processing table, and a bending cylinder is fixedly connected to the bending table, the extension and retraction direction of the piston rod of the bending cylinder is perpendicular to the sliding direction of the bending table, a bending wheel is provided at the end of the piston rod of the bending cylinder, and the circumferential surface of the bending wheel abuts against the wall of the bending portion of the steel pipe blank, and a control mechanism for controlling the movement of the processing table and the bending table is also provided on the frame.

[0014] By adopting the above technical scheme, the processing table and the bending table both move in a straight line, and the bending cylinder is pushed forward so that the steel pipe blank is bent by the thrust to realize the processing operation. Then, the overall moving direction of the steel pipe blank is horizontal directional movement. During bending, the deformed part does not affect the position and state of the processed steel pipe blank, thereby making the processed steel pipe part less affected by the deformation factor, thereby improving the forming quality of the steel pipe.

[0015] Preferably, the control mechanism includes a main rack, a secondary rack, a main gear, a secondary gear and a control motor. The main gear and the secondary gear are coaxially fixedly connected to each other and are both rotatably connected to the frame. The main rack is fixedly connected to the processing table, and the secondary rack is fixedly connected to the bending table. The main rack and the main gear are meshed, and the secondary rack and the secondary gear are meshed. The transmission ratio of the main gear and the secondary gear is 2:1, and the control motor is used to control the rotation of the main gear.

[0016] Preferably, the frame and the processing table are rotatably connected with a guide mechanism, the guide mechanism includes a guide wheel, a clamping wheel and an adjusting assembly, the guide wheel is rotatably connected to the frame or the processing table, the guide wheel and the clamping wheel respectively abut against opposite sides of the steel pipe billet, and the adjusting assembly is used to control the relative distance between the clamping wheel and the guide wheel; the adjusting assembly includes an adjusting block and an adjusting screw, the adjusting screw rotates relative to the frame or the processing table, the adjusting block is threadedly connected to the adjusting screw, the clamping wheel is rotatably connected to the adjusting block, and the axis of the adjusting screw is perpendicular to the axis of the clamping wheel.

[0017] By adopting the above technical solution, the adjustment control changes the distance between the clamping wheel and the guide wheel by controlling the position of the adjustment block, so that the guide mechanism can adapt to the clamping of steel pipe billets with different diameters.

[0018] Preferably, an open component is provided on the processing table, and the open component includes an open seat, the open seat is hinged to the processing table, the adjusting screw on the processing table is rotatably connected to the processing table, the adjusting block is slidably connected to the open seat, the sliding direction of the adjusting block is parallel to the rotation plane of the open seat, the rotation plane of the open seat is parallel to the axis of the clamping wheel, and the open component also includes a limiting member for controlling the rotation of the open seat.

[0019] By adopting the above technical solution, the open seat carries the adjustment component to rotate, and the angle of the clamping wheel thereon is changed. When the clamping wheel swings, the clamping state of the steel pipe blank between the clamping wheel and the guide wheel on the processing table is contacted, so that the operator can take out the steel pipe blank between the two.

[0020] Preferably, the limiting member is a limiting rod, which includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the open seat, and the other end is hinged to the second connecting rod, the end of the second connecting rod away from the first connecting rod is hinged to the processing table, and all the hinge axes on the first connecting rod and the second connecting rod are perpendicular to the rotation plane of the open seat.

[0021] By adopting the above technical solution, based on the processing table, a crank-connecting rod mechanism is composed of an open seat, a first connecting rod and a second connecting rod. When the length directions of the first connecting rod and the second connecting rod coincide, it is the dead point position of the crank-connecting rod mechanism. At this position, the clamping wheel on the processing table can be in a relatively stable angle state; when the open seat needs to be rotated, just turn the first connecting rod.

[0022] Preferably, a bearing chain plate is wound around the processing table, the upper plate surface of the bearing chain plate is flush with the table surface of the processing table, and the clamping plate is detachably connected to the bearing chain plate.

[0023] By adopting the above technical solution, as the processing proceeds, the steel pipe blank on the processing table is constantly moved relative to the processing table. The load-bearing chain plate serves as a movable object connected to the processing table, and plays the role of connecting the steel pipe blank that has completed the bending process based on the processing table.

[0024] Preferably, the bearing chain plate includes a plurality of contact plates, a plurality of connecting holes are formed on the contact plates, and the connecting holes are arranged in an array in the same direction along the arrangement direction of the contact plates. A connecting block is fixedly connected to the clamping plate, the connecting block is inserted into the connecting hole, and the connecting block abuts against the hole wall of the connecting hole.

[0025] By adopting the above technical solution, under the premise that the clamping plate abuts against the steel pipe blank, the connecting block is inserted into the connecting hole and engaged with the contact plate to realize the connection between the clamping plate and the bearing chain plate. At this time, the steel pipe blank on the bearing chain plate is kept in a relatively stable state in the horizontal direction through the clamping plate and the bearing chain plate.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. By setting a pair of adjacent straight pipe sections with clamping pieces each time a bend is made, the pipe material of the steel pipe blank part that has been formed is not easy to be deformed to a large extent, and the product forming quality is improved in the overall production process of the serpentine pipe, and the product yield is also improved;

[0028] 2. Through the setting of the processing table, the bending table and the control mechanism, two bending parts can be formed on the steel pipe blank in a single processing, which improves the processing efficiency, and makes the moving direction of the processed steel pipe blank move in an overall straight line on the processing table, thereby reducing the torque size of the processed steel pipe blank due to its own force arm and reducing the involuntary deformation of the steel pipe blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the pipe bending processing equipment used in the embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the forming principle of the bending portion of the steel pipe blank in the serpentine pipe production process in the embodiment of the present application.

[0031] Figure 3 It is a structural schematic diagram used to reflect the guide mechanism on the frame in the embodiment of the present application.

[0032] Figure 4 It is a structural schematic diagram used to reflect the guide mechanism on the processing table in the embodiment of the present application.

[0033] Figure 5It is a schematic diagram used to illustrate the working principle of the open component in the embodiment of the present application.

[0034] Figure 6 This is a partial enlarged view of part A in the figure.

[0035] Explanation of the accompanying drawings: 1. frame; 11. processing table; 12. bending table; 121. bending cylinder; 122. bending wheel; 13. steel pipe blank; 131. straight pipe section; 132. bending part; 2. control mechanism; 21. control motor; 22. main gear; 23. sub-gear; 24. main rack; 25. sub-rack; 3. guide mechanism; 31. guide wheel; 32. clamping wheel; 33. adjustment assembly; 331. adjustment block; 332. adjustment screw; 34. opening assembly; 341. opening seat; 342. limiting member; 3421. first connecting rod; 3422. second connecting rod; 4. load-bearing chain plate; 41. contact plate; 411. connecting hole; 42. clamping piece; 421. connecting block; 422. clamping groove. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-6 This application is described in further detail.

[0037] The present application embodiment discloses a serpentine tube production process with high molding quality, such as Figure 1 and 2 As shown, the process flow is:

[0038] S1: Put the straight steel tube blank 13 into the tube bending processing equipment, which includes a frame 1, a bending table 12 and a processing table 11. The frame 1 is also provided with a control mechanism 2, wherein the bending table 12 is used to bend and shape the steel tube blank 13, and the processing table 11 assists the processing work of the bending table 12. At the same time, the processing table 11 is used to place and fix the part of the steel tube blank 13 that has completed the bending process, and the control mechanism 2 is used to control the movement of the bending table 12 and the processing table 11;

[0039] S2: Start the control mechanism 2 to bend the steel tube blank 13. The bent steel tube blank 13 forms a straight tube section 131 and a bent portion 132. Two opposite sections of the bent portion 132 are respectively connected to two adjacent straight tube sections 131. The length directions of the two adjacent straight tube sections 131 are parallel.

[0040] S3: a clamping piece 42 is provided on the steel tube blank 13 and between two adjacent straight tube sections 131 , the clamping piece 42 abuts against the tube walls of the two adjacent straight tube sections 131 , and the clamping piece 42 is connected to the processing table 11 ;

[0041] S4: Repeat S2 and S3 until the serpentine tube processing is completed.

[0042] like Figure 1 and 2 As shown, the processing table 11 and the bending table 12 are both slidably connected to the frame 1, and the sliding directions of the two are the same as the moving direction of the steel pipe blank 13. Guide mechanisms 3 are provided on the frame 1 and the processing table 11, and the bending table 12 is located between the guide mechanism 3 on the frame 1 and the processing table 11. The control mechanism 2 includes a main rack 24, a secondary rack 25, a main gear 22, a secondary gear 23 and a control motor 21. The control motor 21 is fixedly installed on the frame 1. The main gear 22 and the secondary gear 23 are both rotatably connected to the frame 1. The output shaft of the control motor 21 is coaxially fixedly connected to the main gear 22 and the secondary gear 23. The transmission ratio of the column gear and the secondary gear 23 is 2:1; the main rack 24 is fixedly connected to the processing table 11, the secondary rack 25 is fixedly connected to the bending table 12, the main rack 24 is meshed with the main gear 22, and the secondary rack 25 is meshed with the secondary gear 23. When the control motor 21 is started, under the transmission action of the gear pair, the processing table 11 and the bending table 12 move in the same direction, and the speed ratio between the two is 2:1.

[0043] like Figure 1 , 3 As shown in Figures 4 and 5, the guide mechanism 3 includes a guide wheel 31, a clamping wheel 32 and an adjustment assembly 33. Taking the guide mechanism 3 on the frame 1 as an example, the guide wheel 31 is rotatably connected to the frame 1, and the guide wheel 31 and the clamping wheel 32 respectively abut against the opposite sides of the steel pipe blank 13. The adjustment assembly 33 is used to control the relative distance between the clamping wheel 32 and the guide wheel 31. The adjustment assembly 33 includes an adjustment block 331 and an adjustment screw 332. The adjustment block 331 is slidably connected to the frame 1, and the sliding direction is perpendicular to the moving direction of the steel pipe blank 13, and at the same time perpendicular to the rotation axis of the guide wheel 31; the adjustment screw 332 is rotatably connected to the frame 1, and the axis of the adjustment screw 332 is perpendicular to the axis of the clamping wheel 32. The adjustment block 331 is threadedly connected to the adjustment screw 332, and the clamping wheel 32 is rotatably connected to the adjustment block 331. The axes of the clamping wheel 32 and the guide wheel 31 are parallel to each other. Therefore, by rotating the adjusting screw 332, the distance between the clamping wheel 32 and the guide wheel 31 can be changed, so that the guide mechanism 3 can adapt to the clamping of steel pipe blanks 13 with different pipe diameters.

[0044] like Figure 1 and 2As shown, a bending cylinder 121 is fixedly connected to the bending table 12, and the piston rod of the bending cylinder 121 is extended and retracted in the horizontal direction and perpendicular to the sliding direction of the bending table 12. A bending wheel 122 is provided at the end of the piston rod of the bending cylinder 121. The circumference of the bending wheel 122 abuts against the tube wall of the steel tube blank 13, and the distance between the bending wheel 122 and the guide wheel 31 on the frame 1 and the guide wheel 31 on the processing table 11 is equal. The guide mechanism 3 on the frame 1 and the guide mechanism 3 on the processing table 11 clamp the steel tube blank 13 on both sides of the bending wheel 122 respectively. When the piston rod of the bending cylinder 121 is extended, the steel tube is bent and deformed by the lateral thrust at the place where the bending wheel 122 abuts, and finally forms a bent portion 132. When the length directions of the straight tube sections 131 at opposite ends of the bending portion 132 are parallel to each other, the bending process of the steel tube blank 13 is completed, and the piston rod of the bending cylinder 121 stops extending and starts to retract.

[0045] like Figure 1 and 2 As shown, when the piston rod of the bending cylinder 121 carries the bending wheel 122 out from between two adjacent straight pipe sections 131, manual operation is required to move the steel tube blank 13 forward, and move the position where the steel tube blank 13 was originally abutted by the guide wheel 31 on the frame 1 to the side of the guide wheel 31 on the processing table 11, so that the processing table 11 can carry the steel tube blank 13 forward and move the unprocessed steel tube blank 13 to the bending wheel 122. While the bending wheel 122 pushes and forms the steel tube blank 13 into a bent portion 132, the guide wheels 31 on the frame 1 and the processing table 11 also exert a bending force on the steel tube blank 13 due to the angular deformation of the straight tube section 131, and also form a bent portion 132, but the guide mechanism 3 on the processing table 11 can only make the steel tube blank 13 form a 90° bending angle, that is, half of the complete bent portion 132. Since the steel tube blank 13 at the guide mechanism 3 on the processing table 11 has been bent at an angle of 90° at the guide mechanism 3 of the frame 1 in the previous process step, the guide assembly on the processing table 11 can form the steel tube blank 13 into a complete bent portion 132 every time (except the first time). It can be seen that the steel tube blank 13 cannot cross the guide wheel 31 on the processing table 11 when it moves in a straight line.

[0046] like Figure 4 and 5As shown, the guide mechanism 3 on the processing table 11 also includes an open component 34, which is used to temporarily release the clamping and limiting effect of the guide wheel 31 and the clamping wheel 32 on the steel pipe blank 13. The open component 34 includes an open seat 341 and a limiter 342. The open seat 341 is hinged to the processing table 11, and its rotation direction is the vertical direction. The adjusting screw 332 of the guide mechanism 3 on the processing table 11 is rotatably connected to the processing table 11, and the adjusting block 331 is slidably connected to the open seat 341. The rotation axis of the adjusting screw 332 and the sliding direction of the adjusting block 331 are parallel to the rotation plane of the open seat 341. The limiting member 342 is used to control the rotation and positioning of the open seat 341. The limiting member 342 is a limiting rod, which includes a first connecting rod 3421 and a second connecting rod 3422. One end of the first connecting rod 3421 is hinged to the open seat 341, and the other end is hinged to the second connecting rod 3422. The end of the second connecting rod 3422 away from the first connecting rod 3421 is hinged to the processing table 11. All the hinge axes on the first connecting rod 3421 and the second connecting rod 3422 are perpendicular to the rotation plane of the open seat 341. Based on the processing table 11, the open seat 341, the first connecting rod 3421 and the second connecting rod 3422 form a crank connecting rod mechanism. When the length directions of the first connecting rod 3421 and the second connecting rod 3422 coincide, it is the dead point position of this crank connecting rod mechanism, and at this time, the axes of the clamping wheel 32 and the guide wheel 31 are parallel, and the clamping wheel 32 and the guide wheel 31 respectively abut the tube walls on opposite sides of the steel tube blank 13. When the operator turns the first connecting rod 3421 to make it swing, the opening seat 341 will carry the adjusting screw 332, the adjusting block 331 and the clamping wheel 32 to rotate, and the distance between the clamping wheel 32 and the guide wheel 31 will increase, so that the steel tube blank 13 between the two can be easily taken out. During the taking-out process, the bent portion 132 here is moved upward, and the limiting effect of the guide wheel 31 on the steel tube blank 13 no longer exists. This operation is accompanied by a small degree of elastic deformation of the steel tube blank 13.

[0047] like Figure 1 and 6As shown, each time the steel tube blank 13 is moved once by manual operation, a processing is completed. Each time the processing is completed, the operator needs to use the clamping piece 42 to reinforce the newly completed steel tube blank 13 to reduce the influence of the deformation of the steel tube blank 13 on the state of the completed part during the subsequent processing. A load-bearing chain plate 4 is wound around the processing table 11. The load-bearing chain plate 4 is freely driven on the processing table 11. During the transmission process, the plate surface facing upward is flush with the table surface of the processing table 11, and this surface is the part that directly contacts the completely processed steel tube blank 13. The clamping piece 42 will be detachably connected to the load-bearing chain plate 4 while abutting and clamping the steel tube blank 13. The load-bearing chain plate 4 includes a plurality of contact plates 41 that are hinged to each other in sequence. The arrangement direction of each contact plate 41 is the transmission direction of the load-bearing chain plate 4. Each contact plate 41 is provided with a plurality of connection holes 411, and the connection holes 411 are arranged in an array along the arrangement direction of the contact plates 41. The clamping piece 42 is provided with a clamping groove 422, the bottom of which will abut against the side of the steel pipe of the straight pipe section 131 away from the contact plate 41. The clamping piece 42 and both sides of the notch of the clamping groove 422 are integrally formed with connecting blocks 421, which are inserted into the connecting hole 411 and engaged with the contact plate 41, thereby the steel pipe blank 13 on the load-bearing chain plate 4 is kept in a relatively stable state in the horizontal direction with the load-bearing chain plate 4 through the clamping piece 42. The connecting holes 411 are provided in two rows, and there are two clamping pieces 42 on a single straight pipe section 131, and the two clamping pieces 42 respectively span the straight pipe section 131 and two different straight pipe sections 131 adjacent thereto.

[0048] The implementation principle of a high-quality serpentine tube production process in the present application embodiment is as follows:

[0049] During the continuous bending process, the processing table 11 and the bending table 12 and the action forms of the two make the feeding direction of the steel tube blank 13 in the processing process horizontally oriented, and under the action of the load-bearing chain plate 4 and the clamping plate 42, the processed steel tube blank 13 maintains a relatively stable state on the processing table 11, reducing the risk of large-scale deformation of the steel tube blank 13, thereby improving the forming quality of the serpentine tube.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A process for producing a serpentine tube with high molding quality, characterized in that: The steps are as follows: S1: placing a steel pipe blank (13) on a pipe bending processing device, wherein the pipe bending processing device comprises a frame (1) and a processing table (11), wherein the processing table (11) and the frame (1) are movably connected; S2: bending the steel tube blank (13), so that the bent steel tube blank (13) forms a straight tube section (131) and a bent portion (132), wherein two opposite sections of the bent portion (132) are respectively connected to two adjacent straight tube sections (131), and the length directions of the two adjacent straight tube sections (131) are parallel; S3: a clamping piece (42) is arranged on the steel pipe blank (13) and between two adjacent straight pipe sections (131), wherein the clamping piece (42) abuts against the pipe walls of the two adjacent straight pipe sections (131), and the clamping piece (42) is connected to the processing table (11); S4: Repeat S2 and S3 until the serpentine tube processing is completed; The processing table (11) is slidably connected to the frame (1), and a bending table (12) is also slidably connected to the frame (1), the sliding direction of the bending table (12) is consistent with the sliding direction of the processing table (11), the bending table (12) is located between the frame (1) and the processing table (11), a bending cylinder (121) is fixedly connected to the bending table (12), the piston rod of the bending cylinder (121) is in a direction of extension and contraction perpendicular to the sliding direction of the bending table (12), a bending wheel (122) is provided at the end of the piston rod of the bending cylinder (121), the circumferential surface of the bending wheel (122) is in contact with the wall of the bending portion (132) of the steel pipe blank (13), and a control mechanism (2) for controlling the movement of the processing table (11) and the bending table (12) is also provided on the frame (1); The frame (1) and the processing table (11) are both rotatably connected with a guide mechanism (3), the guide mechanism (3) comprising a guide wheel (31), a clamping wheel (32) and an adjustment component (33), the guide wheel (31) is rotatably connected to the frame (1) or the processing table (11), the guide wheel (31) and the clamping wheel (32) respectively abut against opposite sides of the steel pipe blank (13), and the adjustment component (33) is used to control the relative distance between the clamping wheel (32) and the guide wheel (31); The adjusting assembly (33) comprises an adjusting block (331) and an adjusting screw (332), wherein the adjusting screw (332) rotates relative to the frame (1) or the processing table (11), the adjusting block (331) is threadedly connected to the adjusting screw (332), the clamping wheel (32) is rotatably connected to the adjusting block (331), and the axis of the adjusting screw (332) is perpendicular to the axis of the clamping wheel (32); An open component (34) is provided on the processing table (11), and the open component (34) includes an open seat (341), the open seat (341) is hinged to the processing table (11), the adjustment screw (332) on the processing table (11) is rotatably connected to the processing table (11), the adjustment block (331) is slidably connected to the open seat (341), the sliding direction of the adjustment block (331) is parallel to the rotation plane of the open seat (341), the rotation plane of the open seat (341) is parallel to the axis of the clamping wheel (32), and the open component (34) also includes a limiting member (342) for controlling the rotation of the open seat (341); The limiting member (342) is a limiting rod, which includes a first connecting rod (3421) and a second connecting rod (3422). One end of the first connecting rod (3421) is hinged to the open seat (341), and the other end is hinged to the second connecting rod (3422). The end of the second connecting rod (3422) away from the first connecting rod (3421) is hinged to the processing table (11). All hinge axes on the first connecting rod (3421) and the second connecting rod (3422) are perpendicular to the rotation plane of the open seat (341).

2. The process for producing a serpentine tube with high forming quality according to claim 1 is characterized in that: The control mechanism (2) comprises a main rack (24), a secondary rack (25), a main gear (22), a secondary gear (23) and a control motor (21); the main gear (22) and the secondary gear (23) are coaxially fixedly connected to each other and are both rotatably connected to the frame (1); the main rack (24) is fixedly connected to the processing table (11); the secondary rack (25) is fixedly connected to the bending table (12); the main rack (24) and the main gear (22) are meshed; the secondary rack (25) and the secondary gear (23) are meshed; the transmission ratio of the main gear (22) and the secondary gear (23) is 2:1; and the control motor (21) is used to control the rotation of the main gear (22).

3. The process for producing a serpentine tube with high forming quality according to claim 1 is characterized in that: A load-bearing chain plate (4) is wound around the processing table (11), the upper plate surface of the load-bearing chain plate (4) is flush with the table surface of the processing table (11), and the clamping piece (42) is detachably connected to the load-bearing chain plate (4).

4. The process for producing a serpentine tube with high forming quality according to claim 3 is characterized in that: The load-bearing chain plate (4) comprises a plurality of contact plates (41), the contact plates (41) are provided with a plurality of connection holes (411), the plurality of connection holes (411) are arranged in an array in the same direction along the arrangement direction of the contact plates (41), a connection block (421) is fixedly connected to the clamping plate (42), the connection block (421) is inserted into the connection hole (411), and the connection block (421) abuts against the hole wall of the connection hole (411).

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