Photovoltaic module support welding device

Abstract

The invention relates to the technical field of welding, in particular to a photovoltaic module support welding device. The welding device comprises a welding assembly and a splicing assembly. The two welding assemblies are arranged on the upper portion and the lower portion of the welding box correspondingly, and each welding assembly comprises an adjusting assembly and a positioning piece. The welding piece is slidably arranged on the positioning piece; the welding device is arranged on the welding piece; the multiple splicing assemblies are arranged around the welding assembly below, and the supporting columns are limited and moved one by one from the bottom through the limiting sleeves so that the supporting columns can be spliced to the welding points of the main beam. A welding device of the upper welding assembly is used for welding a welding point between the main beam and the cross beam; and a welding device of the lower welding assembly is used for welding a welding point between the main beam and the supporting column. The photovoltaic module support is machined in the mode that assembling is conducted firstly and then the upper portion and the lower portion are welded synchronously, the welding efficiency and effect are guaranteed, smoke is little in the welding process, and the requirement for manpower is low.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly to a welding device for a photovoltaic module bracket. Background Art

[0002] A photovoltaic module bracket is a metal structure system used to support and fix solar photovoltaic panels (modules). Its function is to ensure that the photovoltaic panels are installed on the ground, roof or other bases at the best angle and stability to maximize the power generation efficiency and resist external forces such as wind and snow. Welding is one of the key processes in bracket manufacturing and installation, directly affecting the strength and durability of the structure. As Figure 1 shown, the welding nodes mainly include between the main beam 1 and the cross beam 2, and between the main beam 1 and the pillar 2.

[0003] Chinese Patent with the authorization announcement number CN220312092U discloses a welding device for a photovoltaic module bracket, which includes a support frame. A driving component is arranged at the top of the support frame, a sliding component is arranged at the top of the support frame, the driving component is used to drive the sliding component to move, a welding component for welding the photovoltaic module bracket is arranged on the sliding component, a first positioning component is arranged on the support frame, and a second positioning component is arranged on the support frame in front of the first positioning component.

[0004] The above-mentioned welding device for a photovoltaic module bracket adopts a local welding method, which can only perform point-by-point welding on some structures of the bracket. During the welding process, it is necessary to repeatedly install and disassemble the bracket parts, and finally, manual reassembly, adjustment and welding of the welded parts are still required to obtain a complete bracket finished product as Figure 1 . This makes the welding operation of the photovoltaic module bracket time-consuming and laborious, and highly dependent on manual labor. Summary of the Invention

[0005] In view of the problems existing in the background art, a welding device for a photovoltaic module bracket is proposed. Based on the actual size and angle requirements of photovoltaic module installation, the photovoltaic module bracket is processed by first assembling and then synchronously welding from above and below, which ensures the welding efficiency and effect, and has less welding fume and less manpower requirement during the welding process.

[0006] The present invention provides a welding device for a photovoltaic module bracket, which includes a welding assembly and a splicing assembly. Two groups of welding assemblies are provided, which are respectively arranged above and below the welding box. Each group of welding assemblies includes a telescopic adjustment assembly and two movable positioning members; the two positioning members adjust the spacing and inclination angle through the adjustment assembly on the corresponding side, and the spacing between the two positioning members above and below is adjustable and the positions are staggered; the welding members are slidably arranged on the positioning members, and the welding members on the two upper positioning members are used for sleeving and fixing at the welding points at both ends of the cross beam in one-to-one correspondence, and the welding members on the two lower positioning members are used for sleeving and fixing at the welding points at both ends of the main beam in one-to-one correspondence; the welding torch is arranged on the welding member; multiple groups of splicing assemblies are arranged around the lower welding assembly, and the columns are limited and moved one by one from the bottom through the limiting sleeves, so that they are spliced at the welding points of the main beam; the welding torch of the upper welding assembly welds the welding points between the main beam and the cross beam; the welding torch of the lower welding assembly welds the welding points between the main beam and the columns.

[0007] Preferably, the adjustment assembly includes a mounting seat located on the wall of the welding box; a lifting driving member is located on the mounting seat to drive the mounting frame to move up and down; a rotating frame driven to rotate by a rotating driving member is arranged on the mounting frame; a bidirectional translation driving member is arranged on the rotating frame; the two positioning members are respectively connected to the driving ends of the bidirectional translation driving member through mounting rods.

[0008] Preferably, the positioning member includes two groups of positioning plates arranged in parallel, one above the other; one group of positioning plates is connected to the mounting rod on the corresponding side; the electric control telescopic rods are respectively connected to both ends of the paired two groups of positioning plates to form a telescopic frame-shaped positioning structure; moving positioning rollers are arranged on the opposite ends of the paired two groups of positioning plates; multiple groups of welding members are opposite to each other in pairs and are respectively slidably arranged on one side of the paired two groups of positioning plates, communicated with the frame-shaped positioning structure, and are simultaneously located between the two positioning members.

[0009] Preferably, the welding member includes a welding ring slidably arranged on the positioning plate; a through hole for the cross beam and the main beam to pass through is left inside the ring of the welding ring; the welding torch rotates and welds along a circular rule around the through hole.

[0010] Preferably, an installation ring coaxial with the through hole is arranged inside the through hole; a circle of telescopic positioning rods is arranged on the inner ring of the installation ring.

[0011] Preferably, a gas collecting hood is arranged on the outer periphery of the welding ring, and an air extraction cylinder is also arranged; a gas collecting head communicating with the air extraction cylinder is arranged on the wall of the gas collecting hood; the arrangement track of the gas collecting head coincides with the movement track of the welding torch.

[0012] Preferably, the welding ring is slidably connected to the positioning plate through a sliding rod, and at the same time, the welding ring can move up and down along the sliding rod.

[0013] Preferably, the welding device includes a first telescopic rod driven by a driving structure to rotate around a through hole and rotate around the origin at the same time; a second telescopic rod is arranged at the telescopic end of the first telescopic rod and forms a bent structure with the first telescopic rod; a welding head is arranged at the telescopic end of the second telescopic rod.

[0014] Preferably, an installation groove is arranged at the bottom of the welding box; the bottom of the limiting sleeve is arranged to move back and forth, left and right in the installation groove, the top is open, and a clamping member is arranged on the opening.

[0015] Preferably, a sliding bar that moves back and forth is arranged in the installation groove; the limiting sleeve is slidably arranged on the sliding bar in the left-right direction.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: Two sets of welding components that are staggered and mirrored up and down and four sets of splicing components that move independently are provided. The two sets of welding components are respectively coordinated by welding parts, adjusting components and positioning parts to adjust the positions between the main beam and the cross beam, between the main beams, and between the cross beams respectively, and then cooperate with the overall angle adjustment to splice and form an inclined frame that meets the installation requirements of the photovoltaic panel. The splicing components limit and move the pillars through the limiting sleeves and then splice with the inclined frame to form the overall structure of the photovoltaic module bracket. After the combination and splicing, the upper welding head welds the welding points between the cross beam and the main beam through telescoping in two directions and rotating in two ways; the lower welding head welds the welding points between the pillar and the main beam through telescoping in two directions and rotating in two ways; during the welding process, the dust generated during the welding process is collected and filtered at a close distance through the air collecting head, and at the same time, the cooling is accelerated. The above-mentioned welding device for the photovoltaic module bracket processes the photovoltaic module bracket by first assembling and then synchronously welding up and down according to the actual size and angle requirements of the photovoltaic module installation, ensuring the welding efficiency and effect, with less dust during the welding process and less manpower required. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the structure of the photovoltaic module bracket; Figure 2 It is a drawing of the welding device for the photovoltaic module bracket; Figure 3 It is a cross-sectional view of the welding box; Figure 4 It is a schematic diagram of the structure of the welding component; Figure 5 It is a front view of the structure of the positioning part; Figure 6 It is a rear view of the structure of the positioning part; Figure 7 It is a front view of the structure of the welding part; Figure 8 It is a rear view of the structure of the welding part; Figure 9Schematic diagram of the structure of multiple groups of splicing components; Figure 10 Schematic diagram of the structure of a single group of splicing components.

[0018] Reference numerals: 1, main beam; 2, cross beam; 3, support column; 4, welding box; 401, installation groove; 5, welding component; 501, positioning member; 50101, positioning plate; 50102, electric control telescopic rod; 50103, moving positioning roller; 502, adjusting component; 50201, mounting seat; 50202, lifting driving member; 50203, mounting frame; 50204, rotating frame; 50205, bidirectional translation driving member; 50206, mounting rod; 503, welding member; 50301, welding ring; 50302, gas collecting hood; 50303, gas collecting head; 50304, air extraction cylinder; 50305, mounting ring; 50306, positioning rod; 50307, sliding rod; 504, welding torch; 50401, telescopic rod one; 50402, telescopic rod two; 50403, welding head; 6, splicing component; 601, limiting sleeve; 602, engaging member; 603, sliding bar; 604, lead screw two; 605, lead screw three; 606, translation block. Detailed implementation mode

[0019] Example 1, as Figures 1 - 3 shown, the present invention provides a welding device for a photovoltaic module bracket, including a welding component 5 and a splicing component 6. Two groups of welding components 5 are provided, respectively arranged above and below the welding box 4. Each group of welding components 5 includes a telescopic adjusting component 502 and two groups of movable positioning members 501; the spacing and inclination angle of the two groups of positioning members 501 are adjusted by the corresponding adjusting component 502 on the corresponding side, and the spacing between the two groups of positioning members 501 above and below is adjustable and the positions are staggered; the welding member 503 is slidably arranged on the positioning member 501, and the welding members 503 on the two groups of positioning members 501 above are used to sleeved and fixed at the welding points at both ends of the cross beam 2 in one-to-one correspondence, and the welding members 503 on the two groups of positioning members 501 below are used to sleeved and fixed at the welding points at both ends of the main beam 1 in one-to-one correspondence; the welding torch 504 is arranged on the welding member 503; multiple groups of splicing components 6 are arranged around the lower welding component 5, and the support columns 3 are limited and moved one by one from the bottom through the limiting sleeves 601, so that they are spliced at the welding points of the main beam 1.

[0020] Before welding, the cross beam 2 is limited by the upper welding assembly 5, and the welding piece 503 is sleeved and fixed at the welding points at both ends of the cross beam 2; the lower welding assembly 5 limits the main beam 1, and the welding piece 503 is sleeved and fixed at the welding points at both ends of the main beam 1; then the cross beam 2 and the main beam 1 are spliced according to the installation position and angle requirements. At the same time, the support columns 3 are limited and moved one by one through the splicing assembly 6 so that they are spliced at the welding points of the main beam 1; finally, the welder 504 of the upper welding assembly 5 welds the welding points between the main beam 1 and the cross beam 2; the welder 504 of the lower welding assembly 5 welds the welding points between the main beam 1 and the support column 3.

[0021] As Figure 4 shown, the adjusting assembly 502 includes a mounting seat 50201 located on the wall of the welding box 4; the lifting driving member 50202 is located on the mounting seat 50201 and drives the mounting frame 50203 to move up and down; a rotating frame 50204 driven to rotate by a rotating driving member is arranged on the mounting frame 50203; a two-way translation driving member 50205 is arranged on the rotating frame 50204; two groups of positioning members 501 are respectively connected to the driving ends of the two-way translation driving member 50205 through the mounting rod 50206.

[0022] It should be further noted that the lifting driving member 50202 is set as multiple groups of lifting cylinders, which are used to drive the mounting frame 50203 to move up and down to adjust the distance between the cross beam 2 and the main beam 1 so that the cross beam 2 and the main beam 1 are in contact. The rotating driving member is set as a motor installed on the mounting frame 50203, and the motor drives the rotating frame 50204 to rotate. By synchronously rotating the upper and lower rotating frames 50204, the angle between the cross beam 2 and the main beam 1 can be adjusted to meet the requirement of the installation angle inclination. The two-way translation driving member 50205 is set as a double-headed two-way cylinder. By driving the mounting rod 50206 to move, the two groups of positioning members 501 are driven to move, so that the position of the positioning point can be adjusted to match the welding point.

[0023] As Figures 5 - 6 shown, the positioning member 501 includes two groups of positioning plates 50101 arranged in parallel, one above the other; one group of positioning plates 50101 is connected to the corresponding side of the mounting rod 50206; the electric control telescopic rods 50102 are respectively connected to both ends of the paired two groups of positioning plates 50101 to form a retractable frame-shaped positioning structure; moving positioning rollers 50103 are arranged on the opposite ends of the paired two groups of positioning plates 50101. Multiple groups of welding pieces 503 are arranged in pairs and opposite to each other, and are respectively slidably arranged on one side of the paired two groups of positioning plates 50101, communicated with the frame-shaped positioning structure, and are simultaneously located between the two groups of positioning members 501.

[0024] It should be further noted that multiple groups of moving positioning rollers 50103 rotate independently.

[0025] Before welding, the staff respectively sleeved the two ends of the cross beam 2 onto the welding parts 503 above one by one, and sleeved the two ends of the main beam 1 onto the welding parts 503 below one by one. By moving the positioning roller 50103 to rotate and the welding part 503 to slide, the distance between the cross beams 2 and the distance between the main beams 1 are adjusted to meet the installation requirements. In cooperation with further adjusting the distance and angle of the two groups of positioning parts 501, and then using the electric control telescopic rod 50102 to adjust the two groups of positioning plates 50101 to clamp the cross beam 2 and the main beam 1, the welding part 503 can be positioned at the welding point.

[0026] As Figures 7 - 8 shown, the welding part 503 includes a welding ring 50301 slidably arranged on the positioning plate 50101; a through hole for the cross beam 2 and the main beam 1 to pass through is left inside the ring of the welding ring 50301; the welding torch 504 rotates around the through hole along a circular rule for welding.

[0027] When the moving positioning roller 50103 drives the cross beam 2 and the main beam 1 to move, the welding rings 50301 sleeved on the cross beam 2 and the main beam 1 move synchronously. After the positions of the cross beam 2 and the main beam 1 are adjusted, the welding torch 504 can weld around the cross beam 2 and the main beam 1.

[0028] It should be further noted that an installation ring 50305 coaxial with the through hole is arranged inside the through hole; a circle of retractable positioning rods 50306 is arranged on the inner ring of the installation ring 50305.

[0029] The positioning ends of the positioning rods 50306 face the center of the through hole; by arranging a telescopic cylinder inside the installation ring 50305, the positioning rods 50306 are respectively driven to expand and contract to further position the cross beam 2 and the main beam 1 to prevent them from moving during the welding process.

[0030] It should be further noted that a gas collecting hood 50302 is arranged around the outer circumference of the welding ring 50301, and an air extraction cylinder 50304 is also arranged; a gas collecting head 50303 communicating with the air extraction cylinder 50304 is arranged on the wall of the gas collecting hood 50302. The arrangement track of the gas collecting head 50303 coincides with the moving track of the welding torch 504.

[0031] The air extraction cylinder 50304 is internally provided with an air extraction pump and a filter screen, and the smoke and dust during the welding process are collected and filtered at a short distance through the gas collecting head 50303, and at the same time, the cooling is accelerated.

[0032] It should be further noted that the welding ring 50301 is slidably connected to the positioning plate 50101 through a slide bar 50307, and at the same time, the welding ring 50301 can move up and down along the slide bar 50307.

[0033] It should be further noted that sliding grooves are provided on the two groups of positioning plates 50101; the sliding rods 50307 are slidably arranged one above the other in the sliding grooves; screw rods one driven by motors to rotate are respectively arranged at the upper and lower ends on the back surface of the welding ring 50301; mounting blocks are threadedly connected to the screw rods one; the mounting blocks are correspondingly connected to the sliding rods 50307 one by one.

[0034] By moving the welding ring 50301 up and down, the distances between the cross beam 2, the main beam 1 and the pillar 3 can be further adjusted, making the splicing of the three firm and stable.

[0035] It should be further noted that the welding device 504 includes a telescopic rod one 50401 driven by a driving structure to rotate around the through hole and simultaneously rotate in place; a telescopic rod two 50402 is arranged at the telescopic end of the telescopic rod one 50401 and forms a bent structure with the telescopic rod one 50401; a welding head 50403 is arranged at the telescopic end of the telescopic rod two 50402.

[0036] It should be further noted that a circular track is arranged on the outer periphery of the through hole, and a driving structure is formed by combining a motor, a gear and a toothed ring; the telescopic rod one 50401 is further driven by another motor to rotate on the gear, and finally realizes rotation around the through hole and rotation in place.

[0037] It should be further noted that the telescopic rod two 50402 and the telescopic rod one 50401 form an L-shaped structure, and the welding head 50403 realizes multi-directional welding through telescoping in two directions and two rotation modes.

[0038] As Figures 9 - 10 shown, an installation groove 401 is arranged at the bottom of the welding box 4; the bottom of the limiting sleeve 601 is arranged to move back and forth, left and right in the installation groove 401, the top is open, and a clamping part 602 is arranged on the opening.

[0039] It should be further noted that a sliding bar 603 that moves back and forth is arranged in the installation groove 401; the limiting sleeve 601 is slidably arranged on the sliding bar 603 in the left and right directions.

[0040] It should be further noted that a screw rod two 604 driven by a motor one to rotate is arranged on the sliding bar 603; the bottom of the limiting sleeve 601 realizes left and right translation through being threadedly connected to the screw rod two 604; a screw rod three 605 driven by a motor two to rotate is arranged on the groove wall of the installation groove 401; a translation block 606 is threadedly connected to the screw rod three 605 and is simultaneously connected to the sliding bar 603.

[0041] It should be further noted that the clamping part 602 includes a cylinder and a clamping head driven by the cylinder to telescopically move in the opening of the limiting sleeve 601.

[0042] When the support 3 is placed into the limit sleeve 601 and fixed by the engaging member 602, it is then moved back and forth and left and right within the installation groove 401 to adjust the position to be opposite to the welding point of the main beam 1, and finally splicing and welding are performed.

[0043] Embodiment 2: Based on the photovoltaic module bracket welding device in Embodiment 1, a welding method for a photovoltaic module bracket is proposed, and the steps are as follows: S1. The long support 3 and the short support 3 are respectively placed into the corresponding limit sleeves 601. After being fixed by the engaging member 602, the limit sleeves 601 drive the corresponding supports 3 to move back and forth and left and right within the installation groove 401 until reaching the set position. S2. The staff passes the two ends of the cross beam 2 through the through holes on the upper welding member 503 one by one, and sleaves the two ends of the main beam 1 on the through holes on the lower welding member 503 one by one; by moving the positioning roller 50103 to rotate and the welding member 503 to slide, the distance between the cross beams 2 and the distance between the main beams 1 are adjusted. By driving the lifting driving member 50202 to drive the main beam 1 and the cross beam 2 to move up and down, the distance between the cross beam 2 and the main beam 1 is adjusted; by synchronously rotating the upper and lower rotating frames 50204, the angles of the cross beam 2 and the main beam 1 can be adjusted; by driving the installation rod 50206 to move, driving the two groups of positioning members 501 to move along the main beam 1 and the cross beam 2, the position of the welding member 503 can be adjusted to match the welding point. S3. Adjust the two groups of positioning plates 50101 to clamp and position the cross beam 2 and the main beam 1; drive the positioning rod 50306 to expand and contract, and the welding ring 50301 to move up and down to position the cross beam 2 and the main beam 1. S4. The cross beam 2, the main beam 1 and the support 3 are spliced into a shape in sequence. S5. The upper welding head 50403 welds the welding point between the cross beam 2 and the main beam 1 through telescoping in two directions and rotating in two ways; the lower welding head 50403 welds the welding point between the support 3 and the main beam 1 through telescoping in two directions and rotating in two ways; during the welding process, the dust during welding is collected and filtered at a close distance through the air collecting head 50303, and at the same time, the cooling is accelerated. S6. The upper and lower welding members 503 are moved away from the ends of the main beam 1 and the cross beam 2, and the staff releases the limit of the formed bracket by the bottom engaging member 602, and then the welded photovoltaic module bracket can be taken out.

[0044] The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to this. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. A photovoltaic module bracket welding device, characterized in that: include: A welding assembly (5), wherein two groups of welding assemblies (5) are arranged, respectively, at the upper and lower parts of the welding box (4), and each group of welding assemblies (5) comprises a retractable adjustment assembly (502) and two groups of movable positioning members (501); the spacing and the tilt angle of the two groups of positioning members (501) are adjusted by the adjustment assembly (502) on the corresponding side, and the spacing of the two groups of positioning members (501) at the upper and lower parts is adjustable and the positions are staggered; welding members (503) are slidably arranged on the positioning members (501), and the welding members (503) on the two groups of positioning members (501) at the upper parts are used to be sleeved and fixed at the welding points at both ends of the cross beam (2) in a one-to-one manner, and the welding members (503) on the two groups of positioning members (501) at the lower parts are used to be sleeved and fixed at the welding points at both ends of the main beam (1) in a one-to-one manner; and a welder (504) is arranged on the welding member (503); and a splicing assembly (6), wherein a plurality of splicing assemblies (6) are arranged around the lower welding assembly (5), and the support columns (3) are limited and moved one by one from the bottom through the limiting sleeve (601) so that the support columns (3) are spliced ​​at the welding points of the main beam (1); The welder (504) of the upper welding assembly (5) welds the welding point between the main beam (1) and the cross beam (2); and the welder (504) of the lower welding assembly (5) welds the welding point between the main beam (1) and the support column (3).

2. The photovoltaic module support welding device according to claim 1, characterized in that: The adjustment assembly (502) comprises a mounting seat (50201) located on the wall of the welding box (4); a lifting drive member (50202) is located on the mounting seat (50201) and drives the mounting frame (50203) to move up and down; a rotating frame (50204) driven to rotate by a rotating drive member is arranged on the mounting frame (50203); a bidirectional translation drive member (50205) is arranged on the rotating frame (50204); and two sets of positioning members (501) are respectively connected to the driving ends of the bidirectional translation drive member (50205) through mounting rods (50206).

3. The photovoltaic module support welding device according to claim 2, characterized in that: The positioning member (501) comprises two sets of positioning plates (50101) arranged in parallel one above the other; one set of positioning plates (50101) is connected to the mounting rod (50206) on the corresponding side; the electric control telescopic rod (50102) is respectively connected to the two ends of the two sets of positioning plates (50101) in a pair, so as to form a telescopic frame-type positioning structure; the movable positioning rollers (50103) are arranged on the opposite ends of the two sets of positioning plates (50101) in a pair; The plurality of welding pieces (503) are opposed to each other in pairs and are respectively slidably arranged on one side of the two pairs of positioning plates (50101), are connected to the frame-shaped positioning structure, and are simultaneously located between the two sets of positioning pieces (501).

4. The photovoltaic module support welding device according to claim 3, characterized in that: The welding part (503) comprises a welding ring (50301) slidably arranged on the positioning plate (50101); a through hole is reserved in the welding ring (50301) for the cross beam (2) and the main beam (1) to pass through; and the welder (504) rotates around the through hole along a circular rule to weld.

5. The photovoltaic module support welding device according to claim 4, characterized in that: A coaxial mounting ring (50305) is arranged in the through hole; a circle of retractable positioning rods (50306) is arranged inside the mounting ring (50305).

6. The photovoltaic module support welding device according to claim 4, characterized in that: A gas collecting hood (50302) is arranged around the outer circumference of the welding ring (50301), and a gas extraction cylinder (50304) is also arranged; a gas collecting head (50303) connected to the gas extraction cylinder (50304) is arranged on the hood wall of the gas collecting hood (50302); The arrangement trajectory of the gas collecting head (50303) coincides with the movement trajectory of the welding device (504).

7. The photovoltaic module support welding device according to claim 4, characterized in that: The welding ring (50301) is slidably connected to the positioning plate (50101) via a sliding rod (50307), and the welding ring (50301) can move up and down along the sliding rod (50307).

8. The photovoltaic module support welding device according to claim 4, characterized in that: The welder (504) comprises a telescopic rod (50401) driven by a driving structure to rotate around a through hole and simultaneously rotate at an origin; a telescopic rod (50402) arranged on the telescopic end of the telescopic rod (50401) and forming a bending structure with the telescopic rod (50401); and a welding head (50403) arranged on the telescopic end of the telescopic rod (50402).

9. The photovoltaic module support welding device according to claim 1, characterized in that: The bottom of the welding box (4) is provided with a mounting groove (401); the bottom of the limiting sleeve (601) is arranged in the mounting groove (401) to move forward, backward, left and right, and the top is open, and a locking piece (602) is arranged on the open part.

10. The photovoltaic module support welding device according to claim 9, characterized in that: A sliding bar (603) that moves forward and backward is arranged in the installation groove (401); the limiting sleeve (601) is slidably arranged on the sliding bar (603) along the left-right direction.

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