Heavy duty longboard bending machine

Abstract

The invention discloses a heavy-duty long plate top bending machine, which belongs to the field of top bending machines and comprises a machine base and a top supporting mold thereon, wherein a plurality of top supporting columns with adjustable positions are arranged in the top supporting mold, and the top supporting columns are arranged in an arc shape around a positioning shaft on the top supporting mold, and a top pressing seat is driven by a hydraulic cylinder to press a steel plate against the plurality of top supporting columns to form a bending angle, and a telescopic ruler for indicating the axial center distance between each top supporting column and the positioning shaft is provided between each top supporting column and the positioning shaft, and the top bending radius can be adjusted by adjusting the axial center distance between the top supporting column and the positioning shaft one by one, thereby avoiding frequent mold changes, and material supporting assemblies are respectively arranged on both sides of the machine base, and the material supporting assemblies are a chain structure composed of a plurality of alternately hinged traction arms and brackets, which can well adapt to the shape of the steel plate, and a horizontal roller and a vertical stop roller are arranged on the bracket, and the roller is pressed downward by the steel plate to drive the stop roller to clamp the steel plate, so that the side of the steel plate to be top bent is kept upright, and the roller and the stop roller can both roll, thereby facilitating moving any part of the steel plate to the top bending operation area.

Description

Technical Field

[0001] The invention relates to the field of top bending machines, in particular to a heavy-duty long board top bending machine. Background Art

[0002] Some special engineering machinery often has a curved beam structure with a large span, such as the front frame of a grader. This type of curved beam structure is usually formed by a large-scale bending machine to bend a heavier and longer steel plate. Currently, large-scale bending machines for heavy and long plates mostly use a roller mold structure, and the mold is an integrated structure. The curvature of the bending part on the mold is fixed. Therefore, when the bending radius needs to be changed, different types of molds need to be replaced. Especially when multiple bends with different radii need to be made on the same steel plate, the mold change is more frequent, resulting in low processing efficiency. In addition, when different parts of the steel plate are moved to the bending station, it is necessary to rely on crane equipment for lifting, which is not only difficult to operate but also highly dangerous. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a heavy-duty long plate bending machine which can reduce mold changes and facilitate mobile feeding when processing multi-bend angle steel plate bending beams.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A heavy-duty long board bending machine comprises a machine base, a hydraulic oil cylinder is horizontally mounted on the machine base, a pressing seat is fixedly mounted on the hydraulic rod of the hydraulic oil cylinder, bosses are respectively arranged at both ends of the pressing seat, and pressing rollers are respectively connected to the two bosses for rotation along the vertical axis;

[0006] The machine base is provided with a top support mold opposite to the top pressure seat, and the top support mold includes a base fixedly connected to the machine base, and two support plates are spaced apart from each other on one side of the base close to the top pressure seat, and a plurality of straight slots are arranged side by side on the two support plates along the telescopic direction of the hydraulic cylinder, and a ratchet bar is fixedly connected to the long side of the straight slot;

[0007] The top support mold further comprises a plurality of vertically arranged top support columns, the upper and lower parts of which are respectively fixed with slides, the upper slides are slidably arranged in the corresponding straight slots on the upper support plate, and the lower slides are slidably arranged in the corresponding straight slots on the lower support plate;

[0008] The supporting column is a hollow structure, and a core rod is slidably arranged inside the supporting column along its axial direction, and a limit groove is arranged on the core rod, and the limit groove is inclined outward from bottom to top, and a through groove is arranged on the supporting column in the horizontal and vertical direction along the length direction of the straight slot, and a ratchet block is slidably arranged in the through groove, and the inner end of the ratchet block is fixedly connected to a limit pin, and the limit pin is slidably matched with the limit groove;

[0009] A pressure spring is provided between the supporting column and the core rod, and the pressure spring presses the core rod downward to make the ratchet block elastically mesh with the ratchet bar, so as to prevent the supporting column from sliding in the extension direction of the hydraulic cylinder.

[0010] As a preferred technical solution, a vertical positioning shaft is fixedly connected to the base, and a telescopic ruler is provided between the positioning shaft and the plurality of supporting columns, respectively, and the telescopic ruler is used to indicate the axial center distance between the positioning shaft and the supporting column.

[0011] As a preferred technical solution, a circular ring is coaxially fixedly connected to the positioning shaft, and a circular groove is provided on the outer circumference of the circular ring;

[0012] The telescopic ruler comprises an outer sleeve rod and an inner sleeve rod which are slidably connected, one end of the outer sleeve rod is fixedly connected to an arc-shaped slider, and the arc-shaped slider is slidably arranged in the annular groove, one end of the inner sleeve rod is rotatably connected to the supporting column, and the other end is fixedly connected to a pointer, an avoidance groove is provided on the outer sleeve rod corresponding to the sliding range of the pointer, and a scale line matching the pointer is provided on the outer sleeve rod.

[0013] As a preferred technical solution, a handle is fixedly connected to the upper end of the core rod.

[0014] As a preferred technical solution, a push-pull handle is fixedly connected to the upper end of the supporting column.

[0015] As an optimal technical solution, the boss is connected to the top pressure seat in a horizontal and vertical sliding manner along the telescopic direction of the hydraulic cylinder, and the two bosses are respectively connected to screw rods that are rotatable along their sliding directions, and the two screw rods are respectively threadedly connected to the top pressure seat.

[0016] As a preferred technical solution, the two screw rods are respectively provided with a rotating handle.

[0017] As a preferred technical solution, support assemblies are provided on both sides of the machine base, and the support assemblies include a plurality of alternately hinged traction arms and brackets, wherein the innermost traction arm is hinged on the machine base, and a universal wheel is provided at the bottom of the bracket.

[0018] As a preferred technical solution, two vertical support parts are spaced apart on the bracket, and the upper ends of the two vertical support parts are respectively provided with horizontal support parts;

[0019] The two vertical support parts are respectively slidably connected with lifting slides, the bracket is provided with a lifting spring for pressing the lifting slides upward, and a horizontal roller is rotatably connected between the two lifting slides;

[0020] The two horizontal support parts are respectively slidably connected with a horizontal slide seat, and the two horizontal slide seats are respectively rotatably connected with a vertical stop roller;

[0021] Connecting rods are respectively hinged on the two lifting slides, and the two connecting rods are respectively hinged to the corresponding horizontal slides. When the two lifting slides descend, they drive the two horizontal slides to approach each other.

[0022] As a preferred technical solution, both ends of the traction arm are provided with insertion holes respectively, and a latch is provided between the adjacent traction arms and brackets. The latch passes through the insertion holes vertically and is movably inserted into the bracket.

[0023] The present invention adopts the above technical solution, and has the following advantages compared with the prior art:

[0024] 1. The top support mold in the present invention utilizes a plurality of top support columns to form a top bending arc surface. The axial center distance between the top support column and the positioning axis can be changed by adjusting the position of the top support column, thereby adjusting the top bending radius, thereby realizing multiple uses of one mold. When the required top bending radius does not exceed the adjustment range of the top support mold, there is no need to change the mold, which can greatly improve the processing efficiency.

[0025] 2. A telescopic ruler is provided between each supporting column and the positioning axis. The telescopic ruler can intuitively display the axial center distance between the supporting column and the positioning axis, thereby realizing visual operation when adjusting the top bending radius and improving the convenience of operation.

[0026] 3. The positions of the two bosses on the top pressure seat are slidable and adjustable, which is convenient for adjusting the distance between the two top pressure rollers, thereby adjusting the top bending angle.

[0027] 4. The support assembly in the present invention is a chain structure composed of a number of alternately hinged traction arms and brackets, which can adapt well to the shape of the steel plate and can support both the straight and curved parts of the steel plate. When the rollers on the brackets are pressed down by the steel plate, they can drive the stop rollers to clamp the steel plate so that the side of the steel plate to be bent remains upright, and both the rollers and the stop rollers can roll, which is convenient for pushing or dragging the steel plate so that any part of it can be moved between the top pressure seat and the top support mold for top bending operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a heavy-duty long board top bending machine in the present invention;

[0029] Figure 2 for Figure 1 The structural diagram of the middle top support mold and its partial enlarged diagram;

[0030] Figure 3 for Figure 2 Structural diagram of the middle top support column;

[0031] Figure 4 for Figure 3 A cross-sectional view of the middle top support column and a partial enlarged view thereof;

[0032] Figure 5 for Figure 2 A schematic diagram of the structure of the middle telescopic ruler;

[0033] Figure 6 for Figure 1 A schematic diagram of the structure of the middle support assembly;

[0034] Figure 7 for Figure 6 Schematic diagram of the structure of the middle bracket;

[0035] Figure 8 for Figure 1 The effect diagram of the use of medium and heavy-duty longboard bending machine.

[0036] In the figure,

[0037] 10- base; 20- hydraulic cylinder; 30- top pressure seat; 31- boss; 311- top pressure roller; 32- screw rod; 321- rotating handle; 40- top support mold; 41- base; 411- positioning shaft; 412- circular ring; 4121- ring groove; 42- support plate; 421- straight slot; 4211- ratchet bar; 43- top support column; 431- slide; 432- push-pull handle; 433- core rod; 4331- limit groove; 4332- handle; 434- ratchet block; 4341- limit pin; 435- Pressure spring; 44-telescopic ruler; 441-outer rod; 4411-arc slider; 4412-avoidance groove; 4413-scale line; 442-inner rod; 4421-pointer; 50-support assembly; 51-traction arm; 511-socket; 52-latch pin; 53-bracket; 531-vertical support part; 5311-lifting slide; 5312-roller; 5313-lifting spring; 532-horizontal support part; 5321-horizontal slide; 5322-stop roller; 533-connecting rod; 534-universal wheel. DETAILED DESCRIPTION

[0038] The specific implementation methods of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0039] like Figure 1-Figure 8As shown, a heavy-duty long board bending machine includes a machine base 10, a hydraulic cylinder 20, a top pressing seat 30 and a top supporting mold 40. The hydraulic cylinder 20 is installed on the machine base 10 in the horizontal direction. The center part of the top pressing seat 30 is fixedly connected to the hydraulic rod of the hydraulic cylinder 20. The hydraulic cylinder 20 is extended and retracted to drive the top pressing seat 30 to move in a horizontal straight line. The horizontal ends of the top pressing seat 30 are respectively slidably connected with bosses 31. The two bosses 31 are respectively connected with top pressing rollers 311 rotatably along the vertical axis. The sliding direction of the boss 31 is horizontal and vertical to the extension and retraction direction of the hydraulic cylinder 20. The two bosses 31 are respectively connected with screw rods 32 rotatably along their sliding directions. The two screw rods 32 are respectively threadedly connected to the top pressing seat 30, and the two screw rods 32 are respectively connected to the top pressing seat 30. A rotating handle 321 is provided. The screw rod 32 is rotated by rotating the rotating handle 321 to change the horizontal position of the corresponding boss 31, thereby adjusting the horizontal spacing between the two top pressure rollers 311, so as to adjust the top bending angle when the steel plate is top bent. The specific principle is that, when the stroke of the hydraulic cylinder 20 remains unchanged, the larger the horizontal spacing between the two top pressure rollers 311, the smaller the top bending angle, and vice versa. In actual application, the spacing between the two top pressure rollers 311 can also be kept unchanged to adjust the stroke of the hydraulic cylinder 20. The larger the stroke of the hydraulic cylinder 20, the larger the top bending angle, and vice versa. The top bending angle mentioned here refers to the swing angle of the two ends of the bending angle of the steel plate in the process of changing from a straight state to a bent state, rather than the angle after the two ends of the bending angle are formed.

[0040] The top support mold 40 is horizontally opposite to the top pressure seat 30, and includes a base 41 fixedly connected to the machine base 10. Two support plates 42 are provided at intervals on the upper and lower sides of the base 41 close to the top pressure seat 30, wherein the upper support plate 42 is higher than the top pressure roller 311, and the lower support plate 42 is lower than the top pressure roller 311, that is, the top pressure roller 311 can move between the two support plates 42, and a plurality of straight slots 421 are respectively arranged side by side on the two support plates 42 along the extension and contraction direction of the hydraulic cylinder 20, and the multiple straight slots 421 on the upper support plate 42 correspond to the multiple straight slots on the lower support plate 42 one by one up and down, and a ratchet bar 4211 is fixedly connected to the long side of each straight slot 421.

[0041] The top support mold 40 also includes a plurality of vertically arranged top support columns 43, and slides 431 are fixedly arranged on the upper and lower parts of the top support columns 43, respectively. The upper slide 431 is slidably arranged in the corresponding straight slot 421 on the upper support plate 42, and the lower slide 431 is slidably arranged in the corresponding straight slot 421 on the lower support plate 42, so that the top support column 43 can slide and translate along the length direction of the straight slot 421. The top support column 43 is a hollow structure, and its interior is along its A core rod 433 is provided for axial sliding, and a limit groove 4331 is provided on the core rod 433. The limit groove 4331 is inclined outward from bottom to top. A through groove is provided in the horizontal and vertical direction along the length direction of the straight groove 421 on the slide 431. A ratchet block 434 is slidably provided in the through groove. The inner end of the ratchet block 434 is fixedly connected to a limit pin 4341. The limit pin 4341 is slidably matched with the limit groove 4331. A pressure spring is provided between the support column 43 and the core rod 433. The pressure spring 435 presses the core rod 433 downward. Under the elastic force of the pressure spring 435 and the gravity of the core rod 433, the core rod 433 tends to slide downward. The linkage between the limiting groove 4331 and the limiting pin 4341 causes the ratchet block 434 to slide outward, so that the ratchet block 434 is elastically engaged with the ratchet bar 4211, thereby blocking the extension direction of the supporting column 43 toward the hydraulic cylinder 20. The upper end of the core rod 433 is fixedly connected with a handle 4332, and the upper end of the support column 43 is fixedly connected with a push-pull handle 432. When the core rod 433 is lifted by the handle 4332, the ratchet block 434 can be driven to slide inward, thereby separating the ratchet block 434 from the ratchet bar 4211, and then the position of the support column 43 can be changed by pushing and pulling the push-pull handle 432.

[0042] Furthermore, a vertical positioning shaft 411 is fixedly connected to the base 41. In this embodiment, the axis of the positioning shaft 411 and the axis of the hydraulic cylinder 20 are in the same vertical plane. A circular ring 412 is coaxially fixedly connected to the positioning shaft 411. An annular groove 4121 is provided on the outer circumferential surface of the circular ring 412. A telescopic ruler 44 is respectively provided between the positioning shaft 411 and a plurality of supporting columns 43. The telescopic ruler 44 includes an outer sleeve rod 441 and an inner sleeve rod 442. The outer sleeve rod 441 and the inner sleeve rod 442 are slidably sleeved along the length direction of the telescopic ruler 44. One end of the outer sleeve rod 441 is fixedly connected to an arc-shaped slider 4411, and the arc-shaped slider 4411 is slidably set in the annular groove 4121, so that the length direction of the telescopic ruler 44 is always the radial direction of the positioning shaft 411. One end of the inner sleeve rod 442 is rotatably connected to the supporting column 43, and the other end is fixedly connected to a pointer 4421. The outer sleeve rod 441 is provided with an avoidance range corresponding to the sliding range of the pointer 4421. The outer sleeve 441 has a groove 4412, and a scale line 4413 is provided on the long side of the avoidance groove along the outer sleeve 441. The pointer 4421 cooperates with the scale line 4413 to indicate the axial center distance between the corresponding supporting column 43 and the positioning shaft 411. When the values ​​indicated by the multiple telescopic rulers 44 are equal, it means that the axes of the multiple supporting columns 43 are on the same arc surface, and the arc surface is coaxial with the positioning shaft 411. The multiple supporting columns 43 are used to support one side of the steel plate, and the hydraulic cylinder 20 is used to drive the two pressing rollers 311 to press the opposite sides of the steel plate to achieve the top bending of the steel plate. Based on this principle, when it is necessary to adjust the bending radius of the top bending steel plate, it is only necessary to adjust the position of the supporting column 43 one by one so that the value indicated by the corresponding telescopic ruler 44 becomes the required set value. It should be noted that the bending radius of the steel plate = the axial center distance between the supporting column 43 and the positioning shaft 411 + the radius of the supporting column 43 (the radii of the multiple supporting columns 43 are equal and are known values).

[0043] Preferably, a support assembly 50 is provided on both sides of the machine base 10, and the support assembly 50 includes a plurality of traction arms 51 and brackets 53 arranged alternately, and the plurality of traction arms 51 and brackets 53 form a chain structure, and the brackets 53 provide support for the steel plate to be bent, wherein the innermost traction arm 51 is hinged on the machine base 10, and the two ends of the traction arm 51 are respectively provided with a socket 511, and the support assembly 50 also includes a plurality of latches 52, and the latches 52 are used between adjacent traction arms 51 and brackets 53 to vertically pass through the socket 511 and be movably inserted in the brackets. The bracket 53 is mounted on the support frame 53, thereby hingedly connecting the adjacent traction arms 51 and the bracket 53. A universal wheel 534 is provided at the bottom of each bracket 53, so that each bracket 53 can be flexibly swung in the horizontal direction, so that the support assembly 50 can adapt to the shape of the steel plate, especially when the same steel plate is bent in multiple places, the bent parts of the steel plate can be stably supported. The method of connecting the traction arms 51 and the bracket 53 with the pin 52 can facilitate installation or disassembly, and the number of traction arms 51 and the bracket 53 can be conveniently increased or decreased according to the length of the steel plate.

[0044] Two vertical support parts 531 are arranged at intervals on the bracket 53, and horizontal support parts 532 are respectively arranged at the upper ends of the two vertical support parts 531, and lifting slides 5311 are respectively slidably connected to the two vertical support parts 531, and a lifting spring 5313 for pressing the lifting slides 5311 upward is provided on the bracket 53, and a horizontal roller 5312 is rotatably connected between the two lifting slides 5311, and horizontal slides 5321 are respectively slidably connected to the two horizontal support parts 532, and vertical stop rollers 5322 are respectively rotatably connected to the two horizontal slides 5321, and connecting rods 533 are respectively hinged to the two lifting slides 5311, and the two connecting rods 533 are respectively hinged to their corresponding horizontal slides 5321.

[0045] When placing the steel plate, the steel plate should be placed between the two stop rollers 5322. The steel plate is pressed down by the gravity on the roller 5312. When the lifting slides 5311 at both ends of the rollers 5312 descend, the corresponding horizontal slides 5321 are driven to slide inwards through the connecting rods 533 thereon. The two horizontal slides 5321 approach each other until the two stop rollers 5322 clamp the steel plate, which can keep the side of the steel plate to be bent upright. In most cases, the thickness of the steel plate used for bending is uniform, so the rollers 5312 on multiple brackets 53 are of the same height, and the axis of the rollers 5312 is automatically kept perpendicular to the length direction of the steel plate. Both can be rolled, and the steel plate can be pushed or dragged along the supporting assembly 50 with less effort, so that any part of the steel plate can be moved to the top bending operation area (i.e., between the top pressing seat 30 and the top support mold 40). Since the machine base 10 separates the two supporting assemblies 50, the supporting assembly 50 will not interfere with the activity range of the top pressing seat 30. After the top bending is completed, the steel plate can be lifted from the supporting assembly 50 by a crane or other lifting equipment. The roller 5312 and the lifting slide 5311 at both ends of the roller 5312 rise under the elastic force of the lifting spring 5313, driving the horizontal slide 5321 and the stop roller 5322 thereon to slide outward, thereby automatically loosening the steel plate.

[0046] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A heavy-duty long board bending machine, comprising a machine base (10), a hydraulic cylinder (20) being horizontally mounted on the machine base (10), a pressure seat (30) being fixedly mounted on the hydraulic rod of the hydraulic cylinder (20), bosses (31) being respectively arranged at both ends of the pressure seat (30), and pressure rollers (311) being rotatably connected to the two bosses (31) along a vertical axis, characterized in that: The machine base (10) is provided with a top support mold (40) opposite to the top pressure seat (30), and the top support mold (40) includes a base (41) fixedly connected to the machine base (10), and two support plates (42) are spaced apart from each other on one side of the base (41) close to the top pressure seat (30), and a plurality of straight slots (421) are arranged side by side on the two support plates (42) along the extension and contraction direction of the hydraulic cylinder (20), and a ratchet bar (4211) is fixedly connected to the long side of the straight slot (421); The top support mold (40) further comprises a plurality of vertically arranged top support columns (43), wherein the upper and lower parts of the top support columns (43) are respectively fixedly provided with slides (431), wherein the upper slides (431) are slidably arranged in the corresponding straight slots (421) on the upper support plate (42), and the lower slides (431) are slidably arranged in the corresponding straight slots (421) on the lower support plate (42); The supporting column (43) is a hollow structure, and a core rod (433) is slidably arranged inside the supporting column along its axial direction. A limiting groove (4331) is arranged on the core rod (433), and the limiting groove (4331) is inclined outward from bottom to top. A through groove is arranged horizontally and vertically along the length direction of the straight slot (421) on the supporting column (43), and a ratchet block (434) is slidably arranged in the through groove. The inner end of the ratchet block (434) is fixedly connected to a limiting pin (4341), and the limiting pin (4341) is slidably matched with the limiting groove (4331); A pressure spring (435) is provided between the supporting column (43) and the core rod (433), and the pressure spring (435) presses the core rod (433) downward, so that the ratchet block (434) and the ratchet bar (4211) are elastically engaged with each other, so as to prevent the supporting column (43) from sliding in the extension direction of the hydraulic cylinder (20).

2. A heavy-duty long board top bending machine according to claim 1, characterized in that: A vertical positioning shaft (411) is fixedly connected to the base (41), and telescopic rulers (44) are respectively provided between the positioning shaft (411) and a plurality of the supporting columns (43), and the telescopic rulers (44) are used to indicate the axial center distance between the positioning shaft (411) and the supporting columns (43).

3. A heavy-duty long board top bending machine according to claim 2, characterized in that: A circular ring (412) is coaxially fixedly connected to the positioning shaft (411), and a circular groove (4121) is provided on the outer peripheral surface of the circular ring (412); The telescopic ruler (44) comprises an outer sleeve rod (441) and an inner sleeve rod (442) which are slidably sleeved, one end of the outer sleeve rod (441) is fixedly connected with an arc-shaped slider (4411), and the arc-shaped slider (4411) is slidably arranged in the annular groove (4121), one end of the inner sleeve rod (442) is rotatably connected to the supporting column (43), and the other end is fixedly connected with a pointer (4421), the outer sleeve rod (441) is provided with an avoidance groove (4412) corresponding to the sliding range of the pointer (4421), and the outer sleeve rod (441) is provided with a scale line (4413) matching the pointer (4421).

4. The heavy-duty long board top bending machine according to claim 1, characterized in that: The upper end of the core rod (433) is fixedly connected with a handle (4332).

5. The heavy-duty long board top bending machine according to claim 1, characterized in that: A push-pull handle (432) is fixedly connected to the upper end of the supporting column (43).

6. The heavy-duty long board top bending machine according to claim 1, characterized in that: The boss (31) is connected to the top pressing seat (30) in a horizontal and vertical sliding manner along the extension and contraction direction of the hydraulic cylinder (20); the two bosses (31) are respectively connected to screw rods (32) in a rotational manner along their sliding directions; the two screw rods (32) are respectively threadedly connected to the top pressing seat (30).

7. A heavy-duty long board top bending machine according to claim 6, characterized in that: The two screw rods (32) are respectively provided with a rotating handle (321).

8. A heavy-duty long board top bending machine according to any one of claims 1 to 7, characterized in that: A material support assembly (50) is provided on both sides of the machine base (10), and the material support assembly (50) comprises a plurality of alternately hinged traction arms (51) and brackets (53), wherein the innermost traction arm (51) is hinged on the machine base (10), and a universal wheel (534) is provided at the bottom of the bracket (53).

9. A heavy-duty long board top bending machine according to claim 8, characterized in that: Two vertical support parts (531) are arranged on the bracket (53) at intervals, and the upper ends of the two vertical support parts (531) are respectively provided with horizontal support parts (532); The two vertical support parts (531) are respectively slidably connected with a lifting slide (5311), the bracket (53) is provided with a lifting spring (5313) for pressing the lifting slide (5311) upward, and a horizontal roller (5312) is rotatably connected between the two lifting slides (5311); The two horizontal support parts (532) are respectively slidably connected to a horizontal slide seat (5321), and the two horizontal slide seats (5321) are respectively rotatably connected to a vertical stop roller (5322); The two lifting slides (5311) are respectively hinged with connecting rods (533), and the two connecting rods (533) are respectively hinged with the corresponding horizontal slides (5321). When the two lifting slides (5311) descend, they drive the two horizontal slides (5321) to move closer to each other.

10. The heavy-duty long board top bending machine according to claim 8, characterized in that: Insertion holes (511) are respectively provided at both ends of the traction arm (51), and a latch (52) is provided between adjacent traction arms (51) and brackets (53). The latch (52) vertically passes through the insertion holes (511) and is movably inserted into the bracket (53).

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