Novel material supporting frame of cutting machine

By adopting the "X" type mounting rod and adjustment rod limit structure on the cutting machine material bracket, the problem of circular tubular material moving and falling during the cutting process is solved, and the stable cutting of the material is achieved.

CN223084911UActive Publication Date: 2025-07-11WUYI LIPAI POWER TOOLS CO LTD
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Patent Information

Application Number
CN202421737649.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-22
Publication Date
2025-07-11
Estimated Expiration
2034-07-22

AI Technical Summary

Technical Problem

When cutting round tubular material, the material is easily moved left and right and falls easily, affecting the cutting process.

Method used

A new type of cutting machine material bracket is designed, adopting the "X" type mounting rod structure to limit the left and right movement of circular tubular materials, and ensure that the material is secured on the material bracket through the adjustment rod and limit plate.

Benefits of technology

Effectively prevent circular tubular materials from moving left and right during the cutting process, ensuring the stability and safety of the cutting process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of material supporting frames, and particularly relates to a novel material supporting frame of a cutting machine, which comprises a bottom frame, a first side frame and a second side frame, the first side frame and the second side frame are respectively arranged on two sides of the bottom frame, at least one material supporting pipe is arranged between the first side frame and the second side frame, and the first side frame comprises a left first mounting rod and a left second mounting rod. The first side frame comprises a left first mounting rod and a left second mounting rod, the middle part of the left first mounting rod and the middle part of the left second mounting rod are connected to form an X shape, the second side frame comprises a right first mounting rod and a right second mounting rod, and the middle part of the right first mounting rod and the middle part of the right second mounting rod are connected to form an X shape. According to the material supporting frame, the circular-tube-shaped materials cannot move left and right in the cutting process, the circular-tube-shaped materials are prevented from falling to the ground in the cutting process, and a user can conveniently use a cutting machine to cut the circular-tube-shaped materials.
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Description

Technical Field

[0001] The utility model belongs to the technical field of stock supports, and particularly refers to a new type of cutting machine stock support. Background Art

[0002] A cutting machine stock support is a device used in conjunction with a cutting machine. Before cutting, users place the material on the cutting machine stock support, so that the material is separated from the ground by a certain distance, which is convenient for users to cut the material. The existing cutting machine stock supports on the market basically consist of a bottom frame, mounting rods arranged on both sides of the bottom frame, and a material supporting pipe arranged in the middle of the mounting rods. However, when users place a round tubular material on the material supporting pipe, since the length of the round tubular material is relatively long and there are no components on the material supporting pipe to limit the left and right movement of the round tubular material, during the cutting process of one end of the round tubular material by the cutting machine, the round tubular material is likely to move during the cutting process, so that the other end of the round tubular material is likely to fall to the ground, thus affecting the normal cutting and being not conducive to users cutting the round tubular material. Summary of the Invention

[0003] The purpose of the utility model is to provide a stock support with a simple structure. After users place a round tubular material on the cutting machine stock support, the round tubular material will not move left and right during the cutting process, preventing the round tubular material from falling to the ground during the cutting process and being conducive to users using the cutting machine to cut the round tubular material.

[0004] The purpose of the utility model is achieved as follows:

[0005] A new type of cutting machine stock support includes a bottom frame, a first side frame and a second side frame respectively arranged on both sides of the bottom frame. At least one material supporting pipe is arranged between the first side frame and the second side frame. The first side frame includes a left first mounting rod and a left second mounting rod, and the middle parts of the left first mounting rod and the left second mounting rod are connected to form an "X" shape. The second side frame includes a right first mounting rod and a right second mounting rod, and the middle parts of the right first mounting rod and the right second mounting rod are connected to form an "X" shape.

[0006] Furthermore, the number of the material supporting pipes is two, and the two material supporting pipes are respectively arranged between the left first mounting rod and the right first mounting rod and between the left second mounting rod and the right second mounting rod. Cross bars are arranged between the left first mounting rod and the right first mounting rod and between the left second mounting rod and the right second mounting rod, and the material supporting pipes are rotatably sleeved on the cross bars.

[0007] Further, the chassis includes symmetrically arranged left and right mounting plates and a fixing rod disposed between the left and right mounting plates. The middle parts of the left first mounting rod and the left second mounting rod are hinged. The middle parts of the right first mounting rod and the right second mounting rod are hinged. The bottom ends of the left first mounting rod and the right first mounting rod are respectively hinged to the left and right mounting plates. An adjusting rod is further disposed between the left and right mounting plates. Sliding channels are formed on both the left and right mounting plates. The two ends of the adjusting rod are respectively movably disposed in the sliding channels on the left and right sides. The adjusting rod can move along the sliding channels. The bottom ends of the left second mounting rod and the right second mounting rod are connected to the adjusting rod.

[0008] Further, mounting holes are formed at the bottom ends of both the left second mounting rod and the right second mounting rod. The two ends of the adjusting rod respectively pass through the mounting holes on the left second mounting rod and the right second mounting rod and are disposed in the sliding channels. Left and right limiting plates are provided on the adjusting rod. The left second mounting rod is disposed between the left mounting plate and the left limiting plate. The right second mounting rod is disposed between the right mounting plate and the right limiting plate. Threaded holes are formed at both ends of the adjusting rod. Threaded rods are provided in the threaded holes. One end of the threaded rod is disposed outside the threaded hole and the sliding channel and is provided with a rotating part. A butting plate is provided on the rotating part.

[0009] Further, a plurality of arc-shaped card slots are adjacently provided in the sliding channel. The end of the adjusting rod can be disposed in the arc-shaped card slot.

[0010] Further, first connection holes are formed at the bottoms of both the left first mounting rod and the right first mounting rod. First rotating holes are formed on both the left and right mounting plates. First rotating rods are provided in the first rotating holes and the first connection holes. Second connection holes are formed in the middle parts of both the left first mounting rod and the right first mounting rod. Second rotating holes are formed in the middle parts of both the left second mounting rod and the right second mounting rod. Second rotating rods are provided in the second rotating holes and the second connection holes.

[0011] The prominent and beneficial technical effects of the present utility model compared with the prior art are:

[0012] A new type of cutting machine material support frame includes a bottom frame, a first side frame and a second side frame respectively arranged on both sides of the bottom frame. At least one material support pipe is arranged between the first side frame and the second side frame. The first side frame includes a left first mounting rod and a left second mounting rod, and the middle parts of the left first mounting rod and the left second mounting rod are connected to form an "X" shape. The second side frame includes a right first mounting rod and a right second mounting rod, and the middle parts of the right first mounting rod and the right second mounting rod are connected to form an "X" shape. When the user cuts materials with a longer length, the user can choose the number of cutting machine material support frames according to their own needs to avoid the materials contacting the ground, so that the materials can be cut normally. And the number of material support pipes of the present utility model is two and is arranged between the first side frame and the second side frame. When the user wants to cut square materials, when the square materials are placed on the first material support pipe, the lower surface of the square materials will contact the two material support pipes, which can enhance the overall load-bearing capacity of the cutting machine material support frame and enable the materials to be placed on the cutting machine material support frame more stably. Compared with the existing cutting machine material support frames on the market, when the user wants to cut round tubular materials, after the round tubular materials are placed on the material support pipe, due to the long length of the round tubular materials and the lack of components restricting the left and right movement of the round tubular materials on the material support pipe, during the cutting process of one end of the round tubular materials by the cutting machine, the round tubular materials are prone to move during the cutting process, so that the other end of the round tubular materials is likely to fall to the ground, thus affecting the normal cutting and being unfavorable for the user to cut the round tubular materials. Since the middle parts of the left first mounting rod and the left second mounting rod of the present utility model are connected to form an "X" shape, and the middle parts of the right first mounting rod and the right second mounting rod are connected to form an "X" shape, when the user cuts round tubular materials, the round tubular materials can be placed at the intersection of the upper ends of the first side frame and the second side frame, thereby restricting the random left and right movement of the round tubular materials on the cutting machine material support frame. When the user uses the cutting machine to cut one end of the round tubular materials, the round tubular materials will not fall to the ground, which is beneficial for the user to cut the round tubular materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective view of the present utility model.

[0014] Figure 2 is a state diagram of the square materials placed on the material support frame of the present utility model.

[0015] Figure 3 is a state diagram of the round tubular materials placed on the material support frame of the present utility model.

[0016] Figure 4 is an exploded view of the present utility model.

[0017] Figure 5 is an exploded view of the first side frame, the second side frame, the material support pipe and the adjusting rod of the present utility model.

[0018] Figure 6 It is a schematic structural diagram of the adjusting rod of the present utility model.

[0019] Figure 7 It is a three-dimensional view of the rotating part and the threaded rod of the present utility model.

[0020] Figure 8 It is an exploded view of the first side frame of the present utility model.

[0021] Figure 9 It is an exploded view of the second side frame of the present utility model.

[0022] The meanings represented by the reference numerals in the figure:

[0023] 1 - chassis; 2 - first side frame; 3 - second side frame; 4 - material supporting pipe; 5 - left first mounting rod;

[0024] 6 - left second mounting rod; 7 - right first mounting rod; 8 - right second mounting rod; 9 - cross bar;

[0025] 10 - left mounting plate; 11 - right mounting plate; 12 - fixing rod; 13 - adjusting rod; 14 - sliding channel;

[0026] 15 - left limiting plate; 16 - right limiting plate; 17 - mounting hole; 18 - threaded hole; 19 - threaded rod;

[0027] 20 - rotating part; 21 - abutting plate; 22 - arc-shaped card slot; 23 - first connection hole;

[0028] 24 - first rotating hole; 25 - first rotating rod; 26 - second connection hole;

[0029] 27 - second rotating hole; 28 - second rotating rod. Specific embodiments

[0030] The present utility model will be further described below in conjunction with specific embodiments:

[0031] A new type of cutting machine material support frame, including a bottom frame 1, a first side frame 2 and a second side frame 3 respectively arranged on both sides of the bottom frame 1. At least one material support pipe 4 is arranged between the first side frame 2 and the second side frame 3. The first side frame 2 includes a left first mounting rod 5 and a left second mounting rod 6, and the middle parts of the left first mounting rod 5 and the left second mounting rod 6 are connected to form an "X" shape. The second side frame 3 includes a right first mounting rod 7 and a right second mounting rod 8, and the middle parts of the right first mounting rod 7 and the right second mounting rod 8 are connected to form an "X" shape. When the user cuts materials with a longer length, the user can choose the number of cutting machine material support frames according to their own needs to avoid the materials contacting the ground, so that the materials can be cut normally. And the number of the material support pipes 4 of the present utility model is two, which are arranged between the first side frame 2 and the second side frame 3. When the user wants to cut square materials, when the square materials are placed on the first material support pipe 4, the lower surface of the square materials will contact the two material support pipes 4, which can enhance the overall load-bearing capacity of the cutting machine material support frame and enable the materials to be placed on the cutting machine material support frame more stably. Compared with the existing cutting machine material support frames on the market, when the user wants to cut round tubular materials, only after the round tubular materials are placed on the material support pipe 4, due to the longer length of the round tubular materials and the lack of components restricting the left and right movement of the round tubular materials on the material support pipe 4, during the cutting process of one end of the round tubular materials by the cutting machine, the round tubular materials are prone to move, so that the other end of the round tubular materials is likely to fall to the ground, thus affecting the normal cutting and being not conducive to the user cutting the round tubular materials. Since the middle parts of the left first mounting rod 5 and the left second mounting rod 6 of the present utility model are connected to form an "X" shape, and the middle parts of the right first mounting rod 7 and the right second mounting rod 8 are connected to form an "X" shape, when the user cuts round tubular materials, the round tubular materials can be placed at the intersection of the upper ends of the first side frame 2 and the second side frame 3, thereby restricting the random left and right movement of the round tubular materials on the cutting machine material support frame. When the user uses the cutting machine to cut one end of the round tubular materials, the round tubular materials will not fall to the ground, which is beneficial to the user cutting the round tubular materials.

[0032] Preferably, the number of the material support pipes 4 is two. The two material support pipes 4 are respectively arranged between the left first mounting rod 5 and the right first mounting rod 7 and between the left second mounting rod 6 and the right second mounting rod 8. Cross bars 9 are arranged between the left first mounting rod 5 and the right first mounting rod 7 and between the left second mounting rod 6 and the right second mounting rod 8. The material support pipes 4 are rotatably sleeved on the cross bars 9. The two material support pipes 4 are respectively rotatably sleeved on the cross bar 9 between the left first mounting rod 5 and the right first mounting rod 7 and the cross bar 9 between the left second mounting rod 6 and the right second mounting rod 8. When the user finishes cutting the front end of the material and needs to push the material forward, it can make it more labor-saving for the user to push the material forward and avoid the situation that the cutting machine material support frame moves together when the material is pushed to move.

[0033] Preferably, the chassis 1 includes symmetrically arranged left mounting plates 10 and right mounting plates 11 and a fixing rod 12 disposed between the left mounting plate 10 and the right mounting plate 11. The middle parts of the left first mounting rod 5 and the left second mounting rod 6 are hinged. The middle parts of the right first mounting rod 7 and the right second mounting rod 8 are hinged. The bottom ends of the left first mounting rod 5 and the right first mounting rod 7 are respectively hinged to the left mounting plate 10 and the right mounting plate 11. An adjusting rod 13 is further disposed between the left mounting plate 10 and the right mounting plate 11. Sliding channels 14 are formed on both the left mounting plate 10 and the right mounting plate 11. The two ends of the adjusting rod 13 are respectively movably disposed in the sliding channels 14 on the left and right sides. The adjusting rod 13 can move along the sliding channels 14. The bottom ends of the left second mounting rod 6 and the right second mounting rod 8 are connected to the adjusting rod 13. Since the middle parts of the left first mounting rod 5 and the left second mounting rod 6 are hinged, the middle parts of the right first mounting rod 7 and the right second mounting rod 8 are hinged, and the bottom ends of the left first mounting rod 5 and the right first mounting rod 7 are respectively hinged to the left mounting plate 10 and the right mounting plate 11, and the two ends of the adjusting rod 13 between the left mounting plate 10 and the right mounting plate 11 are respectively movably disposed in the sliding channels 14 of the left mounting plate 10 and the right mounting plate 11, the adjusting rod 13 can move along the sliding channels 14, and the bottom ends of the left second mounting rod 6 and the right second mounting rod 8 are connected to the adjusting rod 13. When the user wants to adjust the height of the material supporting pipe 4 from the ground or the size of the crossing angle to meet different needs of the user, when the user pulls the adjusting rod 13 to move back and forth along the sliding channel 14, the height of the material supporting pipe 4 from the ground between the left first mounting rod 5, the right first mounting rod 7, the left second mounting rod 6 and the right second mounting rod 8 changes with the movement of the adjusting rod 13. At the same time, the crossing angle at the upper ends of the left first mounting rod 5 and the left second mounting rod 6 and the right first mounting rod 7 and the right second mounting rod 8 changes with the height of the material supporting pipe 4 from the ground. When the height of the material supporting pipe 4 from the ground is higher, the crossing angle is smaller. When the height of the material supporting pipe 4 from the ground is lower, the crossing angle is larger. When the crossing angle is larger, circular tubular materials with a larger diameter can be placed. Thus, the user can adjust the height of the material supporting pipe 4 from the ground or the size of the crossing angle through the adjusting rod 13 according to actual needs, increasing the practicability of the material supporting frame of the cutting machine.

[0034] Preferably, mounting holes 17 are formed at the bottom ends of the left second mounting rod 6 and the right second mounting rod 8 respectively. Two ends of the adjusting rod 13 respectively pass through the mounting holes 17 on the left second mounting rod 6 and the right second mounting rod 8 and are arranged in the sliding channels 14. The adjusting rod 13 is provided with a left limiting plate 15 and a right limiting plate 16. The left second mounting rod 6 is arranged between the left mounting plate 10 and the left limiting plate 15. The right second mounting rod 8 is arranged between the right mounting plate 11 and the right limiting plate 16. Threaded holes 18 are formed at two ends of the adjusting rod 13. Threaded rods 19 are arranged in the threaded holes 18. One end of each threaded rod 19 is arranged outside the threaded hole 18 and the sliding channel 14 and is provided with a rotating part 20. A contact plate 21 is arranged on the rotating part 20. One end of the adjusting rod 13 of the utility model passes through the mounting hole 17 at the bottom end of the left second mounting rod 6 and is arranged in the sliding channel 14 of the left mounting plate 10, and the left second mounting rod 6 is arranged between the left mounting plate 10 and the left limiting plate 15. The other end of the adjusting rod 13 passes through the mounting hole 17 at the bottom end of the right second mounting rod 8 and is arranged in the sliding channel 14 of the right mounting plate 11, and the right second mounting rod 8 is arranged between the right mounting plate 11 and the right limiting plate 16. The number of the threaded rods 19 and the rotating parts 20 is two. When a user wants to make the first side frame 2 and the second side frame 3 enter the locked state with the left mounting plate 10 and the right mounting plate 11 respectively, the user can drive the threaded rod 19 to rotate by rotating the rotating part 20 counterclockwise, so that the threaded rod 19 and the rotating part 20 move inwards. When the rotating part 20 moves inwards by a certain distance, at this time, the contact plate 21 inside the rotating part 20 will contact the outer side surface of the right mounting plate 11 or the left mounting plate 10. After continuously rotating the rotating part 20 counterclockwise, the contact plate 21 will enter the locked state with the right mounting plate 11 or the left mounting plate 10. At this time, two sides of the left second mounting rod 6 respectively abut against the left limiting plate 15 on the adjusting rod 13 and the inner side surface of the left mounting plate 10, restricting the left second mounting rod 6 from moving left and right on the adjusting rod 13. Two sides of the right second mounting rod 8 respectively abut against the right limiting plate 16 on the adjusting rod 13 and the inner side surface of the right mounting plate 11, restricting the right second mounting rod 8 from moving left and right on the adjusting rod 13. At this time, the adjusting rod 13 cannot move along the sliding channel 14. At the same time, the first side frame 2 and the second side frame 3 are respectively stably mounted on the left mounting plate 10 and the right mounting plate 11, enabling materials to be stably placed on the cutting machine material supporting frame. When the user wants to adjust the height of the material supporting pipe 4 from the ground or the size of the crossing angle, the user can rotate the rotating part 20 clockwise. The rotating part 20 drives the threaded rod 19 to rotate, so that the threaded rod 19 and the rotating part 20 move outwards together. At this time, the locking states between the contact plate 21 and the right mounting plate 11 and the left mounting plate 10 are both released. The user can pull the adjusting rod 13 to move to adjust the height of the material supporting pipe 4 from the ground or the size of the crossing angle. The arrangement of the rotating part 20 enables the user to rotate the threaded rod 19 more quickly and labor-savingly.

[0035] Preferably, a plurality of arc-shaped clamping grooves 22 are adjacently arranged in the sliding channel 14, and the end of the adjusting rod 13 can be arranged in the arc-shaped clamping groove 22; the arc-shaped clamping groove 22 matches the shape of the end of the adjusting rod 13. When the abutting plate 21 on the rotating part 20 and the right mounting plate 11 and the left mounting plate 10 enter the locked state, the adjusting rod 13 can be more stably arranged in the arc-shaped clamping groove 22, so that the adjusting rod 13 cannot move along the sliding channel 14.

[0036] Preferably, first connection holes 23 are formed at the bottoms of the left first mounting rod 5 and the right first mounting rod 7, first rotating holes 24 are formed on both the left mounting plate 10 and the right mounting plate 11, a first rotating rod 25 is arranged in the first rotating hole 24 and the first connection hole 23, second connection holes 26 are formed in the middle parts of the left first mounting rod 5 and the right first mounting rod 7, second rotating holes 27 are formed in the middle parts of the left second mounting rod 6 and the right second mounting rod 8, and a second rotating rod 28 is arranged in the second rotating hole 27 and the second connection hole 26; the bottoms of the left first mounting rod 5 and the right first mounting rod 7 are respectively hinged to the left mounting plate 10 and the right mounting plate 11 through the first rotating rod 25 in the first rotating hole 24 and the first connection hole 23, so that the connection between the left first mounting rod 5 and the left mounting plate 10 is more stable and firm, the connection between the right first mounting rod 7 and the right left mounting plate 10 is more stable and firm, and the middle parts of the left first mounting rod 5 and the right first mounting rod 7 are respectively hinged to the middle parts of the left second mounting rod 6 and the right second mounting rod 8 through the second rotating rod 28 in the second rotating hole 27 and the second connection hole 26, so that the hinge in the middle parts of the left first mounting rod 5 and the left second mounting rod 6 is more stable and firm, the hinge in the middle parts of the right first mounting rod 7 and the right second mounting rod 8 is more stable and firm, thereby making the whole cutting machine material supporting frame more stable and firm and having a longer service life.

[0037] The above embodiments are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A new type of cutting machine material support frame, comprising a bottom frame (1), a first side frame (2) and a second side frame (3) respectively arranged on both sides of the bottom frame (1), at least one material support pipe (4) is arranged between the first side frame (2) and the second side frame (3), and it is characterized in that: The first side frame (2) includes a left first mounting rod (5) and a left second mounting rod (6). The middle parts of the left first mounting rod (5) and the left second mounting rod (6) are connected to form an "X" shape. The second side frame (3) includes a right first mounting rod (7) and a right second mounting rod (8). The middle parts of the right first mounting rod (7) and the right second mounting rod (8) are connected to form an "X" shape.

2. The novel cutting machine material supporting frame according to claim 1, characterized in that: The number of the material supporting pipes (4) is two. The two material supporting pipes (4) are respectively arranged between the left first mounting rod (5) and the right first mounting rod (7), and between the left second mounting rod (6) and the right second mounting rod (8). Cross bars (9) are arranged between the left first mounting rod (5) and the right first mounting rod (7), and between the left second mounting rod (6) and the right second mounting rod (8). The material supporting pipes (4) are rotatably sleeved on the cross bars (9).

3. A new type of cutting machine material support rack according to any one of claims 1-2, characterized in that: The chassis (1) includes symmetrically arranged left mounting plates (10) and right mounting plates (11), and a fixing rod (12) arranged between the left mounting plate (10) and the right mounting plate (11). The middle parts of the left first mounting rod (5) and the left second mounting rod (6) are hinged. The middle parts of the right first mounting rod (7) and the right second mounting rod (8) are hinged. The bottom ends of the left first mounting rod (5) and the right first mounting rod (7) are respectively hinged to the left mounting plate (10) and the right mounting plate (11). An adjusting rod (13) is further arranged between the left mounting plate (10) and the right mounting plate (11). Sliding channels (14) are opened on both the left mounting plate (10) and the right mounting plate (11). The two ends of the adjusting rod (13) are respectively movably arranged in the sliding channels (14) on the left and right sides. The adjusting rod (13) can move along the sliding channels (14). The bottom ends of the left second mounting rod (6) and the right second mounting rod (8) are connected to the adjusting rod (13).

4. A novel cutting machine material supporting frame according to claim 3, characterized in that: Mounting holes (17) are opened at the bottom ends of both the left second mounting rod (6) and the right second mounting rod (8). The two ends of the adjusting rod (13) respectively pass through the mounting holes (17) on the left second mounting rod (6) and the right second mounting rod (8) and are arranged in the sliding channels (14). A left limiting plate (15) and a right limiting plate (16) are arranged on the adjusting rod (13). The left second mounting rod (6) is arranged between the left mounting plate (10) and the left limiting plate (15). The right second mounting rod (8) is arranged between the right mounting plate (11) and the right limiting plate (16). Threaded holes (18) are opened at both ends of the adjusting rod (13). Threaded rods (19) are arranged in the threaded holes (18). One end of the threaded rod (19) is arranged outside the threaded hole (18) and the sliding channel (14) and is provided with a rotating part (20). A butting plate (21) is arranged on the rotating part (20).

5. The novel cutting machine material supporting frame according to claim 4, characterized in that: A plurality of arc-shaped clamping grooves (22) are adjacently arranged in the sliding channel (14). The end part of the adjusting rod (13) can be arranged in the arc-shaped clamping grooves (22).

6. The novel cutting machine material supporting frame according to claim 3, characterized in that: The bottoms of the left first mounting rod (5) and the right first mounting rod (7) are both provided with first connection holes (23), the left mounting plate (10) and the right mounting plate (11) are both provided with first rotation holes (24), a first rotation rod (25) is arranged in the first rotation hole (24) and the first connection hole (23), the middles of the left first mounting rod (5) and the right first mounting rod (7) are both provided with second connection holes (26), the middles of the left second mounting rod (6) and the right second mounting rod (8) are both provided with second rotation holes (27), and a second rotation rod (28) is arranged in the second rotation hole (27) and the second connection hole (26).