Bending forming device for television backboard frame

Abstract

The utility model provides a bending forming device for a television backboard frame, which belongs to the field of television backboard processing and comprises a base, a bearing seat arranged on the inner wall of the base and a through groove formed in the top wall of the bearing seat. The moving assembly is arranged on the inner wall of the base, and the moving assembly comprises a bearing sliding rod fixedly connected to the inner wall of the base, a positioning seat slidably connected to the outer wall of the bearing sliding rod and a displacement motor arranged on the outer wall of the positioning seat; the clamping assembly is slidably connected to the inner wall of the positioning seat; the positioning assembly is rotationally connected to the top of the positioning seat; the pressing assembly is arranged in the base; and the bending assembly is arranged on the inner wall of the base. According to the television back plate frame bending device, a television back plate frame can be bent by various angles according to machining requirements, the bending length of a television back plate can be freely adjusted, repeated clamping and alignment during bending of the television back plate frame are avoided, the bending efficiency of the television back plate is improved, and the application range of the device is widened.

Description

Technical Field

[0001] The utility model relates to the field of television back panel processing, in particular to a bending and forming device for a television back panel frame. Background Art

[0002] With the advancement of science and technology, televisions are generally developing towards being lighter and thinner with larger screens. In order to simultaneously achieve the two technical requirements of large size and thin thickness of televisions, it is necessary to integrate the design of the back panel frame of the television to enhance the structural strength of the back panel frame of the television. During the manufacturing process, the back panel frame, as an important component of the television, is mostly made by manual bending or simple mechanical forming.

[0003] A search revealed that, in the prior art, Chinese patent application number 202021593065.9 discloses a device for right-angle bending of the side frame of an LCD TV back panel, comprising a base with pillars fixedly mounted on both sides of the top of the base, and the tops of the two sets of pillars are fixedly connected to the bottom sides of the top panel. This device can adapt to the bending of panels of different sizes by driving the first movable panel via a second hydraulic cylinder and the second movable panel via a third hydraulic cylinder, but it still has the following drawbacks:

[0004] (1) In the above patent document, the device can only bend at right angles and cannot bend at other angles. The bending limitation of the device is due to the fact that its bending block adopts an L-shaped plate structure, resulting in the bending angle being fixed at 90 degrees. It cannot adapt to diverse processing requirements, which limits the application scope of the device and makes it difficult to meet the diverse processing requirements of television products.

[0005] In the above patent document, the bending block is pushed by the first hydraulic cylinder to bend the frame of the TV back panel, but the bending block can only bend one side of the frame of the TV back panel at a time. When bending the remaining frames of the TV back panel, the TV back panel needs to be repositioned and clamped, which makes the operation steps too cumbersome, increases the labor intensity of the staff, and reduces the bending efficiency.

[0006] Therefore, we have made improvements to this problem and proposed a bending and forming device for the back panel frame of a television. Utility Model Content

[0007] The purpose of the present utility model is to address the problem that the current device can only bend at right angles and cannot bend at other angles. The bending limitation of the device is due to the fact that its bending block adopts an L-shaped plate structure, which results in the bending angle being fixed at 90 degrees and cannot adapt to diverse processing needs. This limits the application scope of the device and makes it difficult to meet the diverse processing requirements of television products. The bending block is pushed by the first hydraulic cylinder to bend the frame of the television back panel, but the bending block can only bend one side of the frame of the television back panel at a time. When the remaining frames of the television back panel are bent, the television back panel needs to be repositioned and clamped, which makes the operation steps too cumbersome, increases the labor intensity of the staff, and reduces the bending efficiency.

[0008] In order to achieve the above-mentioned purpose of the utility model, the utility model provides the following technical solutions:

[0009] A bending and forming device for a television back panel frame, comprising a base, a bearing seat arranged on the inner wall of the base, and a through groove opened on the top wall of the bearing seat, and further comprising;

[0010] A movable assembly is provided on the inner wall of the base and is used to adjust the bending length of the television back panel frame, wherein the movable assembly includes a load-bearing slide fixedly connected to the inner wall of the base, a positioning seat slidably connected to the outer wall of the load-bearing slide, a displacement motor provided on the outer wall of the positioning seat, a gear fixedly connected to the output end of the displacement motor, and a rack fixedly connected to the inner wall of the base, the load-bearing slide and the rack are symmetrically distributed about the central axis of the base, the displacement motor is symmetrically distributed about the central axis of the positioning seat, and the gear and rack are meshed with each other;

[0011] A clamping assembly, slidably connected to the inner wall of the positioning seat, for firmly clamping the back panel of the TV;

[0012] A positioning assembly, rotatably connected to the top of the positioning seat, used to position the bending position of the TV back panel;

[0013] A pressing component is provided inside the base and is used to press and fix the back panel frame of the TV;

[0014] The bending component is arranged on the inner wall of the base and is used for bending the back panel frame of the television.

[0015] As a preferred technical solution of the present invention, the clamping assembly includes a first clamping seat slidably connected to the inner wall of the positioning seat, a first clamping hydraulic cylinder rotatably connected to the outer wall of the positioning seat, a mounting frame fixedly connected to the top wall of the positioning seat, a second clamping seat slidably connected to the inner wall of the mounting frame, and a second clamping hydraulic cylinder rotatably connected to the outer wall of the mounting frame. The first clamping hydraulic cylinder and the second clamping hydraulic cylinder are symmetrically distributed about the central axis of the positioning seat. The first clamping seat can extend upward through the through slot. The first clamping hydraulic cylinder pushes the first clamping seat to move up and down along the inner wall of the positioning seat, and the second clamping hydraulic cylinder pushes the second clamping seat to move up and down along the inner wall of the mounting frame.

[0016] As an optimal technical solution of the present invention, the positioning assembly includes an angle motor fixedly connected to the inner wall of the first clamping seat, a first rotating seat fixedly connected to the output end of the angle motor, a second rotating seat rotatably connected to the bottom wall of the second clamping seat, a positioning motor arranged inside the second clamping seat, a positioning screw fixedly connected to the output end of the positioning motor, and a positioning claw threadedly connected to the outer wall of the positioning screw. The positioning motor, positioning screw and positioning claw are symmetrically distributed about the central axis of the second clamping seat, and the rotation axes of the first rotating seat and the second rotating seat are on the same axis.

[0017] As an optimal technical solution of the present invention, the clamping assembly includes a lifting hydraulic cylinder rotatably connected to the inner wall of the base, a limiting slide rail arranged on the top wall of the bearing seat, a mounting seat slidably connected to the inner wall of the limiting slide rail, a limiting seat slidably connected to the inner wall of the mounting seat, a shaping motor arranged on the top wall of the mounting seat, and a shaping screw fixedly connected to the output end of the shaping motor. The lifting hydraulic cylinder pushes the mounting seat to move up and down along the inner wall of the limiting slide rail. The limiting slide rail, the lifting hydraulic cylinder and the mounting seat are symmetrically distributed about the central axis of the bearing seat, and the limiting seat is threadedly matched with the positioning screw.

[0018] As an optimal technical solution of the present invention, the bending assembly includes a bending seat arranged on the inner bottom wall of the base, a first bending plate rotatably connected to the top wall of the bending seat, a first bending hydraulic cylinder rotatably connected to the top wall of the bending seat, a second bending plate rotatably connected to the bottom wall of the limit seat, and a second bending hydraulic cylinder rotatably connected to the bottom wall of the limit seat, the first bending hydraulic cylinder pushes the first bending plate to rotate about the bending seat, the second bending hydraulic cylinder pushes the second bending plate to rotate about the limit seat, and the bending seats are symmetrically distributed about the central axis of the supporting seat.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the solution of the present utility model:

[0021] 1. The lifting hydraulic cylinder is provided to push the mounting seat downward along the inner wall of the limit slide rail, so that the limit seat is close to the top wall of the TV back panel. The second bending hydraulic cylinder pushes the second bending plate to rotate to a specified angle with respect to the limit seat, thereby bending and limiting the TV back panel frame. The first bending hydraulic cylinder is controlled to push the first bending plate to rotate with respect to the bending seat. The first bending plate bends the TV back panel frame to a specified angle, thus realizing the processing demand of multi-angle bending of the TV back panel frame. This solves the problem that the device in the prior art can only perform right-angle bending and cannot perform bending at other angles. The bending limitation of the device is due to the L-shaped plate structure of the bending block, which results in a fixed bending angle of 90 degrees and cannot adapt to diverse processing requirements. This limits the application range of the device and makes it difficult to meet the diverse processing requirements of TV products.

[0022] 2. By resetting the provided mounting seat, the first bending plate and the second bending plate, the corner motor is controlled to drive the TV back panel to rotate, and the displacement motor is controlled to adjust the position of the TV back panel at the same time, so that the next bending side edge of the TV back panel can be quickly aligned with the edge of the supporting seat, thereby realizing automatic alignment of the TV back panel frame when bending, and solving the problem that the TV back panel frame is bent by pushing the bending block by the first hydraulic cylinder in the prior art, but the bending block can only bend one side of the TV back panel frame at a time, and the TV back panel needs to be repositioned and clamped when the remaining frames of the TV back panel are bent, which makes the operation steps too cumbersome, increases the labor intensity of the staff, and reduces the bending efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a bending and forming device for a television back panel frame provided by the utility model;

[0024] Figure 2 This is one of the cross-sectional structural schematic diagrams of a bending and forming device for a television back panel frame provided by the present invention;

[0025] Figure 3 This is a second schematic cross-sectional view of a bending and forming device for a television back panel frame provided by the present invention;

[0026] Figure 4 This is a third schematic cross-sectional view of a bending and forming device for a television back panel frame provided by the present invention;

[0027] Figure 5 The utility model provides a bending forming device for a TV back panel frame Figure 2 A magnified schematic diagram of the structure in the middle;

[0028] Figure 6The utility model provides a bending forming device for a TV back panel frame Figure 3 A magnified schematic diagram of the structure B in the middle.

[0029] Indicated in the figure:

[0030] 1. Base; 11. Bearing seat; 12. Through slot; 2. Bearing slide bar; 21. Positioning seat; 22. Displacement motor; 23. Gear; 24. Rack; 3. First clamping seat; 31. First clamping hydraulic cylinder; 32. Mounting frame; 33. Second clamping seat; 34. Second clamping hydraulic cylinder; 4. Angle motor; 41. First rotating seat; 42. Second rotating seat; 43. Positioning motor; 44. Positioning screw; 45. Positioning claw; 5. Lifting hydraulic cylinder; 51. Limiting slide rail; 52. Mounting seat; 53. Limiting seat; 54. Shaping motor; 55. Shaping screw; 6. Bending seat; 61. First bending plate; 62. First bending hydraulic cylinder; 63. Second bending plate; 64. Second bending hydraulic cylinder. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0032] like Figure 1 and Figure 4 As shown, this embodiment proposes a bending and forming device for a back panel frame of a television, comprising a base 1, a bearing seat 11 provided on the inner wall of the base 1, and a through groove 12 opened on the top wall of the bearing seat 11, and further comprising;

[0033] A movable assembly is provided on the inner wall of the base 1 and is used to adjust the bending length of the television back panel frame, wherein the movable assembly includes a load-bearing slide 2 fixedly connected to the inner wall of the base 1, a positioning seat 21 slidably connected to the outer wall of the load-bearing slide 2, a displacement motor 22 provided on the outer wall of the positioning seat 21, a gear 23 fixedly connected to the output end of the displacement motor 22, and a rack 24 fixedly connected to the inner wall of the base 1. The load-bearing slide 2 and the rack 24 are symmetrically distributed about the central axis of the base 1, and the displacement motor 22 is symmetrically distributed about the central axis of the positioning seat 21. The gear 23 and the rack 24 are meshed with each other.

[0034] A clamping assembly, slidably connected to the inner wall of the positioning seat 21, for firmly clamping the back panel of the TV;

[0035] A positioning assembly, rotatably connected to the top of the positioning seat 21, used to position the bending position of the TV back panel;

[0036] A pressing assembly is provided inside the base 1 and is used to press and fix the back panel frame of the TV;

[0037] A bending component, provided on the inner wall of the base 1, for bending the back panel frame of the television;

[0038] The control displacement motor 22 drives the gear 23 to rotate. Since the gear 23 and the rack 24 are engaged with each other, the reaction force generated by the rotation of the gear 23 pushes the positioning seat 21 to move a specified distance along the extension direction of the through groove 12, so that the bending part of the TV back panel is aligned with the edge of the supporting seat 11, completing the positioning of the TV back panel before bending.

[0039] like Figure 2 and Figure 4 As shown, as a preferred embodiment, on the basis of the above method, further, the clamping assembly includes a first clamping seat 3 slidably connected to the inner wall of the positioning seat 21, a first clamping hydraulic cylinder 31 rotatably connected to the outer wall of the positioning seat 21, a mounting bracket 32 ​​fixedly connected to the top wall of the positioning seat 21, a second clamping seat 33 slidably connected to the inner wall of the mounting bracket 32, and a second clamping hydraulic cylinder 34 rotatably connected to the outer wall of the mounting bracket 32. The first clamping hydraulic cylinder 31 and the second clamping hydraulic cylinder 34 are symmetrically distributed about the central axis of the positioning seat 21. The first clamping seat 3 can extend upward through the through slot 12. The first clamping seat 3 can extend upward through the through slot 12. The hydraulic cylinder 31 pushes the first clamping seat 3 to move up and down along the inner wall of the eye positioning seat 21, and the second clamping hydraulic cylinder 34 pushes the second clamping seat 33 to move up and down along the inner wall of the mounting frame 32. The back panel of the TV to be bent is placed on the top of the supporting seat 11. The first clamping hydraulic cylinder 31 is controlled to push the first clamping seat 3 to rise so that the first rotating seat 41 pushes the back panel of the TV to rise and leave the surface of the supporting seat 11. The second clamping hydraulic cylinder 34 is controlled to push the second clamping seat 33 to move downward along the inner wall of the mounting frame 32, so that the second rotating seat 42 is close to the top wall of the TV back panel, completing the fixed clamping of the TV back panel in the vertical direction.

[0040] like Figure 2 、 Figure 3 and Figure 5 As shown, as a preferred embodiment, on the basis of the above method, further, the positioning assembly includes a corner motor 4 fixedly connected to the inner wall of the first clamping seat 3, a first rotating seat 41 fixedly connected to the output end of the corner motor 4, a second rotating seat 42 rotatably connected to the bottom wall of the second clamping seat 33, a positioning motor 43 arranged inside the second clamping seat 33, a positioning screw 44 fixedly connected to the output end of the positioning motor 43 and a positioning claw 45 threadedly connected to the outer wall of the positioning screw 44, the positioning motor 43, the positioning screw 44 and the positioning claw 45 are symmetrically distributed about the central axis of the second clamping seat 33, the rotation axes of the first rotating seat 41 and the second rotating seat 42 are on the same axis, the corner motor 4 is controlled to drive the TV back panel to rotate, and at the same time the displacement motor 22 is controlled to adjust the position of the TV back panel, so that the bent side edges of the TV back panel can be quickly aligned with the edge of the supporting seat 11.

[0041] like Figure 1 、 Figure 3 and Figure 6 As shown, as a preferred embodiment, on the basis of the above method, the clamping assembly further includes a lifting hydraulic cylinder 5 rotatably connected to the inner wall of the base 1, a limiting slide rail 51 arranged on the top wall of the bearing seat 11, a mounting seat 52 slidably connected to the inner wall of the limiting slide rail 51, a limiting seat 53 slidably connected to the inner wall of the mounting seat 52, a shaping motor 54 arranged on the top wall of the mounting seat 52 and a shaping screw 55 fixedly connected to the output end of the shaping motor 54. The lifting hydraulic cylinder 5 pushes the mounting seat 52 to move up and down along the inner wall of the limiting slide rail 51. The limiting slide rail 51, the lifting hydraulic cylinder 5 and the mounting seat 52 are symmetrically distributed about the central axis of the bearing seat 11. The limiting seat 53 is threadedly matched with the positioning screw 44. Starting the lifting hydraulic cylinder 5 pushes the mounting seat 52 to move downward along the inner wall of the limiting slide rail 51, so that the limiting seat 53 is close to the top wall of the back panel of the TV.

[0042] like Figure 3 and Figure 6 As shown, as a preferred embodiment, on the basis of the above method, further, the bending assembly includes a bending seat 6 arranged on the inner bottom wall of the base 1, a first bending plate 61 rotatably connected to the top wall of the bending seat 6, a first bending hydraulic cylinder 62 rotatably connected to the top wall of the bending seat 6, a second bending plate 63 rotatably connected to the bottom wall of the limiting seat 53, and a second bending hydraulic cylinder 64 rotatably connected to the bottom wall of the limiting seat 53. The first bending hydraulic cylinder 62 pushes the first bending plate 61 to rotate about the bending seat 6, and the second bending hydraulic cylinder 64 pushes the second bending plate 63 to rotate about the limiting seat 53. The bending seat 6 is symmetrically distributed about the central axis of the supporting seat 11. The second bending hydraulic cylinder 64 is controlled to push the second bending plate 63 to rotate to a specified angle about the limiting seat 53 to complete the limiting of the bending of the TV back panel frame. The first bending hydraulic cylinder 62 is controlled to push the first bending plate 61 to rotate about the bending seat 6, and the first bending plate 61 bends the TV back panel frame to a specified angle.

[0043] Specifically, when the device is in use: the back panel of the TV to be bent is placed on the top of the supporting seat 11, the first clamping hydraulic cylinder 31 is controlled to push the first clamping seat 3 up so that the first rotating seat 41 pushes the TV back panel up and leaves the surface of the supporting seat 11, the positioning motor 43 is controlled to drive the positioning screw 44 to rotate, and the positioning screw 44 drives the positioning claw 45 to move toward the direction of the TV back panel to center the TV back panel so that the symmetrical center of the TV back panel is located on the central axis of the supporting seat 11. After the positioning is completed, the positioning claw 45 is reset, and the second clamping hydraulic cylinder 34 is controlled to push The second clamping seat 33 is moved downward along the inner wall of the mounting frame 32, so that the second rotating seat 42 is close to the top wall of the TV back panel, completing the fixed clamping of the TV back panel in the vertical direction, and then the horizontal height of the TV back panel is adjusted by controlling the first clamping hydraulic cylinder 31 and the second clamping hydraulic cylinder 34 to make it close to the surface of the bearing seat 11, and the displacement motor 22 is controlled to drive the gear 23 to rotate. Since the gear 23 and the rack 24 are meshed with each other, the reaction force generated by the rotation of the gear 23 pushes the positioning seat 21 to move a specified distance along the extension direction of the through slot 12, so that the bending part of the TV back panel is aligned with the bearing seat 11. The edge of the carrier 11 is aligned to complete the positioning of the TV back panel before bending. The lifting hydraulic cylinder 5 is started to push the mounting seat 52 to move downward along the inner wall of the limiting slide rail 51, so that the limiting seat 53 is close to the top wall of the TV back panel. The second bending hydraulic cylinder 64 is controlled to push the second bending plate 63 to rotate to a specified angle with respect to the limiting seat 53, completing the limiting of the bending of the TV back panel frame. The first bending hydraulic cylinder 62 is controlled to push the first bending plate 61 to rotate with respect to the bending seat 6. The first bending plate 61 bends the TV back panel frame to a specified angle. Finally, the shaping motor 54 is controlled to drive the shaping screw 55 Rotation, since the shaping screw 55 is threadedly matched with the limiting seat 53, the limiting seat 53 can reciprocate along the extension direction of the shaping screw 55, completing the shaping of the bent edges of the TV back panel and improving the bending quality. After completing the bending work on one side, the mounting seat 52, the first bending plate 61 and the second bending plate 63 are reset, and the corner motor 4 is controlled to drive the TV back panel to rotate, and at the same time, the displacement motor 22 is controlled to adjust the position of the TV back panel, so that the next bending side of the TV back panel can be quickly aligned with the edge of the supporting seat 11, completing the automatic alignment of the TV back panel frame when bending.

[0044] All technical features in this embodiment can be freely combined according to actual needs.

[0045] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. A bending and forming device for a television back panel frame, comprising a base (1), a bearing seat (11) arranged on the inner wall of the base (1), and a through groove (12) opened on the top wall of the bearing seat (11), and further comprising: The movable component is arranged on the inner wall of the base (1) and is used to adjust the bending length of the TV back panel frame, and is characterized in that: The moving assembly comprises a bearing slide (2) fixedly connected to the inner wall of the base (1), a positioning seat (21) slidably connected to the outer wall of the bearing slide (2), a displacement motor (22) arranged on the outer wall of the positioning seat (21), a gear (23) fixedly connected to the output end of the displacement motor (22), and a rack (24) fixedly connected to the inner wall of the base (1); the bearing slide (2) and the rack (24) are symmetrically distributed about the central axis of the base (1); the displacement motor (22) is symmetrically distributed about the central axis of the positioning seat (21); and the gear (23) and the rack (24) are meshed with each other; A clamping assembly, slidably connected to the inner wall of the positioning seat (21), for firmly clamping the back panel of the television; A positioning assembly, rotatably connected to the top of the positioning seat (21), used for positioning the bending position of the back panel of the television; A pressing component is arranged inside the base (1) and is used to press and fix the back panel frame of the television; The bending component is arranged on the inner wall of the base (1) and is used for bending the back panel frame of the television.

2. The bending and forming device for a television back panel frame according to claim 1, characterized in that: The clamping assembly comprises a first clamping seat (3) slidably connected to the inner wall of the positioning seat (21), a first clamping hydraulic cylinder (31) rotatably connected to the outer wall of the positioning seat (21), a mounting frame (32) fixedly connected to the top wall of the positioning seat (21), a second clamping seat (33) slidably connected to the inner wall of the mounting frame (32), and a second clamping hydraulic cylinder (34) rotatably connected to the outer wall of the mounting frame (32), wherein the first clamping hydraulic cylinder (31) and the second clamping hydraulic cylinder (34) are symmetrically distributed about the central axis of the positioning seat (21), the first clamping seat (3) can extend upward through the through slot (12), the first clamping hydraulic cylinder (31) pushes the first clamping seat (3) to move up and down along the inner wall of the positioning seat (21), and the second clamping hydraulic cylinder (34) pushes the second clamping seat (33) to move up and down along the inner wall of the mounting frame (32).

3. The bending and forming device for a television back panel frame according to claim 2, characterized in that: The positioning assembly comprises an angle motor (4) fixedly connected to the inner wall of the first clamping seat (3), a first rotating seat (41) fixedly connected to the output end of the angle motor (4), a second rotating seat (42) rotatably connected to the bottom wall of the second clamping seat (33), a positioning motor (43) arranged inside the second clamping seat (33), a positioning screw (44) fixedly connected to the output end of the positioning motor (43), and a positioning claw (45) threadedly connected to the outer wall of the positioning screw (44); the positioning motor (43), the positioning screw (44), and the positioning claw (45) are symmetrically distributed about the central axis of the second clamping seat (33); and the rotation axes of the first rotating seat (41) and the second rotating seat (42) are on the same axis.

4. The bending and forming device for a television back panel frame according to claim 1, characterized in that: The clamping assembly comprises a lifting hydraulic cylinder (5) rotatably connected to the inner wall of the base (1), a limiting slide rail (51) arranged on the top wall of the bearing seat (11), a mounting seat (52) slidably connected to the inner wall of the limiting slide rail (51), a limiting seat (53) slidably connected to the inner wall of the mounting seat (52), a shaping motor (54) arranged on the top wall of the mounting seat (52), and a shaping screw (55) fixedly connected to the output end of the shaping motor (54). The lifting hydraulic cylinder (5) pushes the mounting seat (52) to move up and down along the inner wall of the limiting slide rail (51). The limiting slide rail (51), the lifting hydraulic cylinder (5) and the mounting seat (52) are symmetrically distributed about the central axis of the bearing seat (11). The limiting seat (53) is threadedly engaged with the positioning screw (44).

5. The bending and forming device for a television back panel frame according to claim 4, characterized in that: The bending assembly comprises a bending seat (6) arranged on the inner bottom wall of the base (1), a first bending plate (61) rotatably connected to the top wall of the bending seat (6), a first bending hydraulic cylinder (62) rotatably connected to the top wall of the bending seat (6), a second bending plate (63) rotatably connected to the bottom wall of the limiting seat (53), and a second bending hydraulic cylinder (64) rotatably connected to the bottom wall of the limiting seat (53), wherein the first bending hydraulic cylinder (62) pushes the first bending plate (61) to rotate relative to the bending seat (6), and the second bending hydraulic cylinder (64) pushes the second bending plate (63) to rotate relative to the limiting seat (53), and the bending seat (6) is symmetrically distributed relative to the central axis of the bearing seat (11).

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