A laser cutting machine for separating and processing metal pipes

Abstract

The present invention relates to the technical field of laser cutting machines, and discloses a laser cutting machine for separating and processing metal pipes, comprising a workbench, on which two support bars are fixedly installed, a support frame a is provided on the two support bars, a laser cutting head is provided on the support frame a, a support frame b is provided on the two support bars, and a moving device is provided on the support frame b. The moving device can drive the moving block to move and squeeze one of the trapezoidal blocks as it moves, so that the pressure block can be driven by the lifting rod to move downward to extrude and fix the cut metal pipe. When the metal pipe is cut, the moving block leaves therewith, so that the rebound of the pressure spring will drive the lifting rod to move upward through the lifting ring, thereby driving the pressure block to move upward, so that the user can move the steel pipe backward to prepare for lower side cutting, so that the cut metal pipe can be moved to prepare for lower side cutting when the laser cutting head cuts other metal pipes.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting machines, in particular to a laser cutting machine for separating and processing metal pipes. Background Art

[0002] A laser cutting machine is generally composed of a laser generator, a light guide system, a CNC motion system, a cutting head, an operating table, an air source, a water source and an exhaust system. Its processing method has the characteristics of high precision and low processing cost. It has the characteristics of simple operation and small error. It is widely used in manufacturing fields such as the automotive industry and aerospace. The working principle is to use laser as energy. When using a laser cutting machine to cut metal pipes, most of the time, multiple metal pipes are set up on the laser cutting machine for cutting at the same time. Most laser cutting machines need to fix multiple metal pipes when cutting, and then adjust the position one by one after all metal pipes are cut to perform the next cutting. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides a laser cutting machine for separated processing of metal pipes, which has the advantages of being able to move the cut metal pipe to prepare for lower side cutting when the laser cutting head is cutting other metal pipes. It solves the problem that when a laser cutting machine is used to cut metal pipes, multiple metal pipes are usually set up on the laser cutting machine for cutting at the same time. Most laser cutting machines need to fix multiple metal pipes when cutting, and then adjust the positions one by one for the next cutting after all the metal pipes are cut.

[0004] In order to achieve the above-mentioned purpose of being able to move the cut metal pipe to prepare for lower side cutting when the laser cutting head is cutting other metal pipes, the present invention provides the following technical solutions: a laser cutting machine for separating and processing metal pipe fittings, comprising a workbench, two support bars are fixedly installed on the workbench, support frames a are provided on the two support bars, a laser cutting head is provided on support frame a, support frames b are provided on the two support bars, a moving device is provided on support frame b, a moving block is fixedly installed on the lower side of the moving device, a horizontal plate is fixedly installed on the upper side of the workbench, a plurality of grooves a are provided on the horizontal plate, a square plate is fixedly installed on the side where the two support bars are close to each other, and a plurality of fixed Block, several fixed blocks are fixedly connected to the two square plates, two circular grooves are provided on the lower side of each fixed block, and a lifting rod is movably passed through the inner wall of each circular groove, and a lifting ring is fixedly sleeved on each lifting rod, and a pressure spring is fixedly installed on the lower side of each lifting ring, and each pressure spring is movably sleeved on the lifting rod, and a fixing ring is fixedly installed on the lower end of each pressure spring, and each fixing ring is fixedly connected to each circular groove respectively, a trapezoidal block is provided above each fixed block, and each trapezoidal block is fixedly connected to each lifting rod respectively, a pressure block is provided under each fixed block, and each pressure block is connected to each lifting rod respectively, and a pressure groove is provided on the lower side of each pressure block.

[0005] Preferably, the workbench is provided with a material discharge chute, a baffle is fixed in the material discharge chute, and two inclined plates are fixedly installed on the front of the baffle, with a gap between the two inclined plates.

[0006] Preferably, a T-shaped plate is provided between the two support bars, a long strip is fixedly installed on the front of the T-shaped plate, a horizontal bar is fixedly installed on the front of the T-shaped plate, a plurality of brackets are provided on the upper side of the horizontal bar, and an L-shaped plate is fixedly installed on the upper side of both support bars.

[0007] Preferably, both L-shaped plates are provided with fixing grooves, both fixing grooves are movably connected with screws, both screws are threaded through the upper side of the long strip, and both screws are fixedly installed with rotating blocks on the upper ends, and the two rotating blocks are respectively fitted with the upper sides of the two L-shaped plates.

[0008] Preferably, a support plate is fixedly installed on the upper side of the workbench, a groove b is provided on the upper side of the support plate, a rotating rod is provided between the support plate and the cross plate, a rotating motor is fixedly installed on the right side of the workbench, the output shaft of the rotating motor movably passes through the support bar on the right of the two support bars, the output shaft of the rotating motor is fixedly connected to the rotating rod, and a number of rotating columns are fixedly sleeved on the rotating rod, and each rotating column is provided with a number of annular wall grooves.

[0009] Preferably, a square groove is provided on the lower side of the movable block, and two round rods are fixedly installed in the square groove, and movable columns are movably sleeved on the two round rods.

[0010] Preferably, two short columns are fixedly installed on the upper side of each pressure block, a connecting column is fixedly installed on the upper side of each short column, a connecting groove is opened at the lower end of each lifting rod, each connecting column is movably connected to each connecting groove, and each lifting rod is threaded with a rotating tube, and each rotating tube is threaded on each short column.

[0011] Preferably, each of the pressure grooves has two arc grooves on the inner side wall, an arc strip is fixedly installed in each arc groove, an arc soft strip is fixedly installed on the inner side of each arc strip, a mounting plate a is provided on the upper side of the support plate, each groove b is provided on the mounting plate a, a mounting plate b is provided on the upper side of the cross plate, each groove a is provided on the mounting plate b, the front and rear sides of the mounting plates a and b are rotated through the limit rod, and a limit strip is fixedly installed on each limit rod.

[0012] Compared with the prior art, the present invention provides a laser cutting machine for separating and processing metal pipes, which has the following beneficial effects:

[0013] The laser cutting machine for separating and processing metal pipe fittings places the metal pipe to be cut in each groove a, and sets the moving device to move with the laser cutting head. When the laser cutting head moves to cut the metal pipe, the moving device can drive the moving block to move and squeeze one of the trapezoidal blocks, so that the pressure block can be driven downward by the lifting rod to squeeze and fix the cut metal pipe. When the metal pipe is cut, the moving block moves away, so that the rebound of the pressure spring will drive the lifting rod to move upward through the lifting ring, thereby driving the pressure block to move upward, so that the user can move the steel pipe backward to prepare for cutting the lower side, so that the cut metal pipe can be moved to prepare for cutting the lower side when the laser cutting head cuts other metal pipes.

[0014] The laser cutting machine for separating and processing metal pipe fittings uses a laser cutting head to cut the metal pipe. The cut metal pipe will fall into a small material trough and will then be caught by two inclined plates. The metal pipe will roll along the two inclined plates through the gap between the two inclined plates for centralized unloading, making it convenient for users to centrally collect the cut metal pipes.

[0015] The laser cutting machine for separating and processing metal pipes can hold the metal pipes by means of horizontal bars and brackets, and can facilitate the positioning of the metal pipes by means of the blocking of the T-shaped plates. The T-shaped plates can be fixed by means of the rotating blocks and screws, so that the length of the cut steel pipes can be limited by setting the T-shaped plates at different positions.

[0016] The laser cutting machine for separating and processing metal pipes can drive the rotating rod to rotate through the rotating motor, thereby driving each rotating column to rotate, so that the metal pipe to be cut can be driven to move backward, so that the metal pipe can be automatically transported backward after the metal pipe cutting is completed.

[0017] The laser cutting machine for separating and processing metal pipes can reduce the friction between the moving block and the trapezoidal block through the movable column, thereby avoiding long-term excessive friction causing damage to the moving block and the trapezoidal block and seriously affecting the service life, thereby improving the practicality of the device.

[0018] The laser cutting machine for separating and processing metal pipe fittings rotates the rotating tube upward. When the rotating tube is separated from the short column, it can be moved downward to remove the pressure block. This makes it convenient for users to replace the pressure block according to the thickness of the metal pipe, so that the metal pipe can be fixed using a pressure groove of an appropriate size.

[0019] 7. The laser cutting machine for separating metal pipe fittings can rotate each limit bar to make it easy to separate each limit bar from the support plate and the cross plate, and then the mounting plate a and the mounting plate b can be taken out, so that grooves a and grooves b of different sizes can be replaced by replacing different mounting plates a and mounting plates b. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the front three-dimensional structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the middle workbench;

[0022] Figure 3 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the fixed block;

[0023] Figure 4 For the present invention Figure 1 A schematic diagram of the cross-sectional three-dimensional structure of the moving block;

[0024] Figure 5 For the present invention Figure 1 A schematic diagram of the cross-sectional three-dimensional structure of the middle fixed block;

[0025] Figure 6 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the middle T-shaped plate;

[0026] Figure 7 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the rotating motor.

[0027] In the figure: 1. Workbench; 2. Support plate; 3. Horizontal plate; 4. Fixed block; 5. Square plate; 6. Moving block; 7. Long strip; 8. Support bar; 9. L-shaped plate; 10. Rotating block; 11. Fixed groove; 12. T-shaped plate; 13. Laser cutting head; 14. Moving device; 15. Support frame a; 16. Support frame b; 17. Rotating motor; 18. Rotating rod; 19. Rotating column; 20. Annular wall groove; 21. Screw; 22. Horizontal bar; 23. Bracket; 24. Trapezoidal block; 25. Pressure block; 26 , pressure groove; 27, square groove; 28, movable column; 29, round rod; 30, lifting rod; 31, lifting ring; 32, discharge chute; 33, pressure spring; 34, fixing ring; 35, connecting groove; 36, short column; 37, connecting column; 38, arc groove; 39, arc soft strip; 40, arc strip; 41, rotating tube; 42, round groove; 43, limit rod; 44, limit strip; 45, mounting plate a; 46, groove b; 47, mounting plate b; 48, groove a; 49, baffle; 50, inclined plate. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings, wherein the same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "up" and "down", "bottom" and "top" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 7The present invention provides a technical solution: a laser cutting machine for separating and processing metal pipes, comprising a workbench 1, two support bars 8 are fixedly installed on the workbench 1, a support frame a15 is provided on the two support bars 8, a laser cutting head 13 is provided on the support frame a15, a support frame b16 is provided on the two support bars 8, a moving device 14 is provided on the support frame b16, a moving block 6 is fixedly installed on the lower side of the moving device 14, a horizontal plate 3 is fixedly installed on the upper side of the workbench 1, a plurality of grooves a48 are provided on the horizontal plate 3, a square plate 5 is fixedly installed on the side where the two support bars 8 are close to each other, a plurality of fixed blocks 4 are provided between the two square plates 5, the plurality of fixed blocks 4 are fixedly connected to the two square plates 5, and each fixed block 4 has two circular openings on the lower side. Groove 42, each circular groove 42 has a lifting rod 30 movably passing through the inner wall, each lifting rod 30 is fixedly sleeved with a lifting ring 31, and a pressure spring 33 is fixedly installed on the lower side of each lifting ring 31, each pressure spring 33 is movably sleeved on the lifting rod 30, and a fixing ring 34 is fixedly installed on the lower end of each pressure spring 33, and each fixing ring 34 is fixedly connected to each circular groove 42, respectively. A trapezoidal block 24 is provided above each fixed block 4, and each trapezoidal block 24 is fixedly connected to each lifting rod 30, respectively. A pressure block 25 is provided below each fixed block 4, and each pressure block 25 is connected to each lifting rod 30, and a pressure groove 26 is opened on the lower side of each pressure block 25. By placing the metal pipe to be cut on each In the groove a48, the moving device 14 is set to move with the laser cutting head 13. When the laser cutting head 13 moves to cut the metal pipe, the moving device 14 can drive the moving block 6 to move and squeeze one of the trapezoidal blocks 24. In this way, the pressure block 25 can be driven downward by the lifting rod 30 to squeeze and fix the cut metal pipe. When the metal pipe is cut, the moving block 6 will leave, and the rebound of the pressure spring 33 will drive the lifting rod 30 to move upward through the lifting ring 31, thereby driving the pressure block 25 to move upward, so that the user can move the steel pipe backward to prepare for cutting on the lower side, so that the cut metal pipe can be moved to prepare for cutting on the lower side when the laser cutting head 13 cuts other metal pipes. There is a The material feeding trough 32 has a baffle 49 fixed inside, and two inclined plates 50 are fixedly installed on the front of the baffle 49. There is a gap between the two inclined plates 50. After the metal tube is cut by the laser cutting head 13, the cut metal tube will fall into the small material feeding trough 32, and then it will be caught by the two inclined plates 50. In this way, the metal tube will roll along the two inclined plates 50 through the gap between the two inclined plates 50 for centralized feeding, so that users can conveniently collect the cut metal tubes in a centralized manner. A T-shaped plate 12 is provided between the two support bars 8, and a long strip 7 is fixedly installed on the front of the T-shaped plate 12. A horizontal bar 22 is fixedly installed on the front of the T-shaped plate 12. A plurality of brackets 23 are provided on the upper side of the horizontal bar 22. An L-shaped plate 9 is fixedly installed on the upper side of the two support bars 8.The two L-shaped plates 9 are both provided with a fixing groove 11, and the two fixing grooves 11 are both movably connected with a screw rod 21. The two screw rods 21 are threaded through the upper side of the long strip 7, and the upper ends of the two screw rods 21 are fixedly installed with a rotating block 10. The two rotating blocks 10 are respectively fitted with the upper sides of the two L-shaped plates 9, and the metal pipe can be dragged by the cross bar 22 and the bracket 23. At the same time, the user can conveniently position the metal pipe by blocking the T-shaped plate 12. At the same time, the T-shaped plate 12 can be fixed by the rotating block 10 and the screw 21. In this way, the length of the cutting steel pipe can be limited by setting the T-shaped plate 12 in different positions. A support plate 2 is fixedly installed on the upper side of the workbench 1, and a groove b46 is provided on the upper side of the support plate 2. A rotating rod 18 is provided between the support plate 2 and the cross plate 3. A rotating motor 17 is fixedly installed on the right side of the workbench 1. The output shaft of the rotating motor 17 movably passes through the support bar 8 on the right of the two support bars 8. The output shaft of the rotating motor 17 is fixedly connected to the rotating rod 18. A plurality of rotating columns 19 are fixedly sleeved on the rotating rod 18. Each rotating column 19 is provided with a plurality of annular wall grooves 20. The rotating motor 17 can drive the rotating rod 18 to rotate, thereby driving each rotating column 19 to rotate, so that the metal pipe to be cut can be driven to move backward, so that the metal pipe can be automatically transported backward after the metal pipe cutting is completed. A square groove 27 is provided on the lower side of the moving block 6, and two round rods 29 are fixedly installed in the square groove 27. The two round rods 29 are movably sleeved with movable columns 28. The moving column 28 can reduce the friction between the moving block 6 and the trapezoidal block 24, thereby avoiding long-term excessive friction that causes damage to the moving block 6 and the trapezoidal block 24 and seriously affects the service life. In this way, the practicality of the device can be improved. Two short columns 36 are fixedly installed on the upper side of each pressure block 25, and a connecting column 37 is fixedly installed on the upper side of each short column 36. A connecting groove 35 is provided at the lower end of each lifting rod 30, and each connecting column 37 is movably connected to each connecting groove 35. A rotating tube 41 is threadedly sleeved on each lifting rod 30, and each rotating tube 41 is threadedly sleeved on each short column 36. By rotating the rotating tube 41 upward, when the rotating tube 41 is separated from the short column 36, the pressure block 25 can be moved downward to be removed. , This makes it convenient for users to replace the pressure block 25 according to the thickness of the metal pipe, so that the metal pipe can be fixed by using the pressure groove 26 of the appropriate size. Each pressure groove 26 has two arc grooves 38 on the inner wall, and an arc strip 40 is fixedly installed in each arc groove 38. An arc soft strip 39 is fixedly installed on the inner side of each arc strip 40. A mounting plate a45 is provided on the upper side of the support plate 2, and each groove b46 is provided on the mounting plate a45. A mounting plate b47 is provided on the upper side of the cross plate 3, and each groove a48 is provided on the mounting plate b47. The front and rear sides of the mounting plates a45 and b47 are both rotated through the limit rod 43, and a limit strip 44 is fixedly installed on each limit rod 43. By rotating each limit strip 44,After each limiting strip 44 is easily separated from the support plate 2 and the cross plate 3, the mounting plate a45 and the mounting plate b47 can be removed, so that the grooves a48 and the grooves b46 of different sizes can be replaced by replacing different mounting plates a45 and b47.

[0031] When in use, the first step is: by placing the metal tube to be cut in each groove a48, the moving device 14 is set to move with the laser cutting head 13. When the laser cutting head 13 moves to cut the metal tube, the moving device 14 can drive the moving block 6 to move and squeeze one of the trapezoidal blocks 24. In this way, the pressure block 25 can be driven downward by the lifting rod 30 to squeeze and fix the cut metal tube. When the metal tube is cut, the moving block 6 will leave, so that the rebound of the pressure spring 33 will drive the lifting rod 30 to move upward through the lifting ring 31, thereby driving the pressure block 25 to move upward, so that the user can move the steel tube backward to prepare for lower side cutting, so that the cut metal tube can be moved to prepare for lower side cutting when the laser cutting head 13 cuts other metal tubes.

[0032] Step 2: After the metal tube is cut by the laser cutting head 13, the cut metal tube will fall into the small material trough 32 and then be caught by the two inclined plates 50. In this way, the metal tube will roll along the two inclined plates 50 through the gap between the two inclined plates 50 for centralized discharge, so that users can conveniently collect the cut metal tubes in a centralized manner.

[0033] Step 3: The metal pipe can be dragged by the horizontal bar 22 and the bracket 23. At the same time, the T-shaped plate 12 can be used to block the metal pipe, and the T-shaped plate 12 can be fixed by the rotating block 10 and the screw 21. In this way, the length of the cut steel pipe can be limited by setting the T-shaped plate 12 in different positions.

[0034] Step 4: The rotating motor 17 can drive the rotating rod 18 to rotate, thereby driving each rotating column 19 to rotate, so that the metal pipe to be cut can be driven to move backward, so that the metal pipe can be automatically transported backward after the metal pipe cutting is completed.

[0035] Step 5: The movable column 28 can reduce the friction between the moving block 6 and the trapezoidal block 24, thereby avoiding long-term excessive friction that causes damage to the moving block 6 and the trapezoidal block 24 and seriously affects the service life, thereby improving the practicality of the device.

[0036] Step 6: By rotating the rotating tube 41 upward, when the rotating tube 41 is separated from the short column 36, the pressure block 25 can be moved downward to remove it. This makes it convenient for the user to replace the pressure block 25 according to the thickness of the metal tube, so that the metal tube can be fixed using the pressure groove 26 of appropriate size.

[0037] Step 7: By rotating each limit bar 44 so that each limit bar 44 can be easily separated from the support plate 2 and the cross plate 3, the mounting plate a45 and the mounting plate b47 can be taken out, so that the grooves a48 and the grooves b46 of different sizes can be replaced by replacing different mounting plates a45 and b47.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A laser cutting machine for separating and processing metal pipes, comprising a workbench (1), two support bars (8) fixedly mounted on the workbench (1), a support frame a (15) disposed on the two support bars (8), a laser cutting head (13) disposed on the support frame a (15), a support frame b (16) disposed on the two support bars (8), a moving device (14) disposed on the support frame b (16), and characterized in that: A moving block (6) is fixedly installed on the lower side of the moving device (14), a transverse plate (3) is fixedly installed on the upper side of the workbench (1), and a plurality of grooves a (48) are provided on the transverse plate (3). A square plate (5) is fixedly installed on the side where the two support bars (8) are close to each other, and a plurality of fixed blocks (4) are provided between the two square plates (5). The plurality of fixed blocks (4) and the two square plates (5) are fixedly connected to each other. Two circular grooves (42) are provided on the lower side of each fixed block (4), and a lifting rod (30) is movably passed through the inner wall of each circular groove (42). A lifting ring (31) is fixedly sleeved on each lifting rod (30), and each lifting ring ( A pressure spring (33) is fixedly installed on the lower side of each of the pressure springs (33), each of which is movably sleeved on the lifting rod (30), and a fixing ring (34) is fixedly installed on the lower end of each of the pressure springs (33), each of which is fixedly connected to each of the circular grooves (42), and a trapezoidal block (24) is provided above each of the fixed blocks (4), each of which is fixedly connected to each of the lifting rods (30), and a pressure block (25) is provided below each of the fixed blocks (4), each of which is connected to each of the lifting rods (30), and a pressure groove (26) is provided on the lower side of each of the pressure blocks (25).

2. The laser cutting machine for separating and processing metal pipes according to claim 1, characterized in that: The workbench (1) is provided with a material discharge trough (32), a baffle (49) is fixed in the material discharge trough (32), and two inclined plates (50) are fixedly mounted on the front of the baffle (49), with a gap between the two inclined plates (50).

3. The laser cutting machine for separating and processing metal pipes according to claim 1, characterized in that: A T-shaped plate (12) is provided between the two support bars (8), a long bar (7) is fixedly installed on the front of the T-shaped plate (12), a horizontal bar (22) is fixedly installed on the front of the T-shaped plate (12), a plurality of brackets (23) are provided on the upper side of the horizontal bar (22), and an L-shaped plate (9) is fixedly installed on the upper side of both support bars (8).

4. The laser cutting machine for separating and processing metal pipes according to claim 3, characterized in that: The two L-shaped plates (9) are each provided with a fixing groove (11), and the two fixing grooves (11) are both movably connected with a screw rod (21), and the two screw rods (21) are threadedly passed through the upper side of the long strip (7), and the upper ends of the two screw rods (21) are fixedly mounted with a rotating block (10), and the two rotating blocks (10) are respectively fitted with the upper sides of the two L-shaped plates (9).

5. The laser cutting machine for separating and processing metal pipes according to claim 1, characterized in that: A support plate (2) is fixedly mounted on the upper side of the workbench (1), a groove b (46) is provided on the upper side of the support plate (2), a rotating rod (18) is provided between the support plate (2) and the cross plate (3), a rotating motor (17) is fixedly mounted on the right side of the workbench (1), an output shaft of the rotating motor (17) movably passes through the right support bar (8) of the two support bars (8), the output shaft of the rotating motor (17) is fixedly connected to the rotating rod (18), a plurality of rotating columns (19) are fixedly sleeved on the rotating rod (18), and each rotating column (19) is provided with a plurality of annular wall grooves (20).

6. The laser cutting machine for separating and processing metal pipes according to claim 1, characterized in that: A square groove (27) is provided on the lower side of the movable block (6), and two round rods (29) are fixedly installed in the square groove (27). A movable column (28) is movably sleeved on the two round rods (29).

7. The laser cutting machine for separating and processing metal pipes according to claim 1, characterized in that: Two short columns (36) are fixedly mounted on the upper side of each pressure block (25), a connecting column (37) is fixedly mounted on the upper side of each short column (36), a connecting groove (35) is provided at the lower end of each lifting rod (30), each connecting column (37) is movably connected to each connecting groove (35), and a rotating tube (41) is threadedly sleeved on each lifting rod (30), and each rotating tube (41) is threadedly sleeved on each short column (36).

8. The laser cutting machine for separating and processing metal pipes according to claim 5, characterized in that: Each of the pressure grooves (26) has two arc grooves (38) on its inner side wall, and an arc strip (40) is fixedly installed in each arc groove (38), and an arc soft strip (39) is fixedly installed on the inner side of each arc strip (40). A mounting plate a (45) is provided on the upper side of the support plate (2), and each groove b (46) is provided on the mounting plate a (45). A mounting plate b (47) is provided on the upper side of the cross plate (3), and each groove a (48) is provided on the mounting plate b (47). The front and rear sides of the mounting plate a (45) and the mounting plate b (47) are both rotated to pass through the limit rod (43), and a limit strip (44) is fixedly installed on each limit rod (43).

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