A hoisting device for steel structure construction

Abstract

The present invention relates to the technical field of hoisting equipment, and specifically relates to a hoisting equipment for steel structure construction, including a support plate. A connecting plate is rotatably arranged at the upper end of the support plate. Above the connecting plate, there is a hanging part connected to the hook of a hoisting machine. Inside the connecting plate, there is a protection device for fixing the hanging part. At the bottom of the support plate, a group of limiting plates are slidably installed. At the bottom of the limiting plates, there is a binding device for fixing steel plates. On the side wall of the limiting plates, there is an anti-detachment device. By arranging a group of slidable limiting plates at the bottom of the support plate, driving a winding drum to rotate by a motor, controlling the contraction and release of a steel chain by the winding drum, and then connecting a fastening plate with a hanging hook, the binding process of the steel structure is realized, changing the traditional way of manually arranging the chain, so that the chains will not be entangled and disordered, and the hoisting efficiency of the steel structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting equipment, and more particularly to a hoisting equipment for steel structure construction. Background Art

[0002] Hoisting is a general term for the installation and positioning of equipment by a crane or a hoisting mechanism; during the overhaul or maintenance process, various hoisting tools are used to lift equipment, workpieces, utensils, materials, etc., so that their positions change. We often encounter work such as the installation, transportation, and installation of equipment, and often use a gin pole hoisting or a mechanical hoisting method. The use of hoisting equipment is also indispensable during the construction process of steel structures.

[0003] Chinese Patent with the authorization announcement number CN115676628A discloses a hoisting equipment for steel structure construction. By placing the steel structure on the top of the adjusting pallet and pressing it on the adjusting wheel, then the weighing mechanism detects the weight difference between the two ends of the adjusting pallet, and controls the operation of the adjusting wheel through the detection result. The adjusting wheel drives the steel structure to move, so that the center of gravity of the steel structure coincides with the center of the adjusting pallet. After coincidence, there is no weight difference between the two ends of the adjusting pallet, and thus the hoisting center can be automatically found, and the hoisting efficiency is high.

[0004] However, during the hoisting process of the existing steel structure hoisting equipment for steel structures, the steel structure is usually tied with a chain, and the hook in the hoisting equipment is used to hook and lift. However, the process of manually arranging the chain to tie the steel structure is complicated, and the chains will be entangled with each other, affecting the hoisting efficiency of the steel structure. In addition, during the process of tying the steel structure with a chain, the steel structure is prone to shaking during hoisting, resulting in unstable hoisting of the steel structure, and there are certain safety hazards.

[0005] Therefore, a hoisting equipment for steel structure construction is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a hoisting equipment for steel structure construction to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A hoisting equipment for steel structure construction, including a support plate, a connecting plate is rotatably arranged at the upper end of the support plate, a hanging member connected to the hook of the hoisting machine is arranged above the connecting plate, a protection device for fixing the hanging member is arranged inside the connecting plate, a group of limiting plates are slidably installed at the bottom of the support plate, a binding device for fixing the steel plate is arranged at the bottom of the limiting plate, and an anti-detachment device is arranged on the side wall of the limiting plate. The binding device includes a motor, a winding drum is fixedly installed on the power output shaft of the motor, an iron chain is wound around the outer side wall of the winding drum, one end of the iron chain is fixedly installed with a fastening plate, and a hanging hook matching the fastening plate is fixedly installed at one end of the limiting plate.

[0008] By adopting the above technical solution, a set of slidable limit plates are arranged at the bottom of the support plate, and a motor is used to drive the winding drum to rotate, so that the winding drum controls the contraction and release of the iron chain. Then, the fastening plate is connected to the hanging hook, thereby realizing the binding process of the steel structure, changing the traditional way of manually arranging the chain, preventing the chains from being entangled and disordered, and improving the hoisting efficiency of the steel structure.

[0009] Preferably, a groove is formed on the upper surface of one end of the limit plate, and the motor is fixedly installed in the groove. A protective shell is fixedly installed on the upper surface of the limit plate above the winding drum. One end of the iron chain is fixedly installed on the outer side wall of the winding drum, and the end of the iron chain far from the winding drum penetrates through the limit plate and extends to the bottom of the limit plate.

[0010] Preferably, the anti-detachment device includes a chute, which is formed on the end face of one end of the limit plate. A slider is slidably installed inside the chute. The slider is L-shaped, and the end of the slider far from the chute extends to the bottom of the limit plate. A threaded rod is rotatably installed inside the chute, and the threaded rod is in screw drive with the slider. One end of the threaded rod extends to the outside of the limit plate. A group of limit rods are fixedly installed on the outer side wall of the slider. The two limit rods are symmetric about the horizontal center axis of the slider, and the limit rods are T-shaped.

[0011] Preferably, a baffle is fixedly installed on the outer side wall of the limit plate at the bottom of the winding drum. The end of the limit rod far from the slider penetrates through the baffle, and the baffle is parallel to the slider. A connecting groove is formed at the bottom of the support plate, and a double-headed screw rod is rotatably installed inside the connecting groove. One end of the double-headed screw rod extends to the outside of the support plate. A group of connecting blocks are threadedly connected to the outer side wall of the double-headed screw rod. The connecting blocks are T-shaped, and the bottom of the connecting blocks is fixedly connected to the upper surface of the limit plate.

[0012] Preferably, the protection device includes a fixed rod. The connecting plate is U-shaped. There are two fixed rods, which are symmetrically installed on the inner walls of the U-shaped opening ends of the connecting plate. The hanging member is fixedly installed at the center of the U-shaped opening end of the connecting plate. A transmission plate is rotatably installed on the outer side wall of the fixed rod. The mutually approaching ends of the transmission plates are rotatably connected to the two ends of the hanging member. The transmission plates are arc-shaped. One end of one of the transmission plates is rotatably installed with a snap plate, and one end of the other transmission plate is rotatably installed with a deduction plate. The snap plate is U-shaped, and sliding blocks are fixedly installed on the inner walls of the U-shaped opening ends of the snap plate. A first pressing plate is fixedly installed on the upper surface of one end of the snap plate. A group of symmetric deduction grooves are formed on the outer side wall of the deduction plate. The sliding blocks are matched with the deduction grooves. A second pressing plate is fixedly installed on the upper surface of one end of the deduction plate. The first pressing plate is parallel to the second pressing plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. By arranging a set of slidable limit plates at the bottom of the support plate, driving the winding drum to rotate by a motor, controlling the contraction and release of the iron chain by the winding drum, and then connecting the fastening plate with the suspension hook, the binding process of the steel structure is realized, changing the traditional way of manually arranging the chain, so that the chains will not be entangled and disordered, and the hoisting efficiency of the steel structure is improved;

[0015] 2. By sliding the slider in the chute in the anti-dropping device, making the slider approach the baffle to squeeze the chain, so that the chain is fixed during work, changing the traditional way of manually tying and binding the chain, and further enabling the steel structure to remain stable during hoisting, avoiding the occurrence of potential safety hazards;

[0016] 3. By sliding the buckle plate in the protection device around the deduction plate, when the hanging part is lifted, the buckle plate drives the first pressing plate and the deduction plate drives the second pressing plate to approach each other, realizing the extrusion and fixation of the rope at the output end of the hoist and limiting the hook of the hoist, thereby preventing the hoist from unhooking during the lifting and lowering of the steel structure and avoiding the occurrence of potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the limit plate of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the double-headed screw of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the limit plate of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the iron chain of the present invention;

[0023] Figure 6 It is of the present invention Figure 5 Enlarged view of the structure at A;

[0024] Figure 7Schematic diagram of the deduction plate structure of the present invention;

[0025] Figure 8 Schematic diagram of the buckle plate structure of the present invention;

[0026] Figure 9 Schematic diagram of the first extrusion plate structure of the present invention.

[0027] Explanation of reference numerals:

[0028] 1, support plate; 2, connecting plate; 3, hanging part; 4, protection device; 41, buckle plate; 42, first extrusion plate; 43, deduction plate; 44, transmission plate; 45, second extrusion plate; 46, fixing rod; 47, deduction groove; 48, sliding block; 5, binding device; 51, motor; 52, iron chain; 53, fastening plate; 54, suspension hook; 55, groove; 56, protection shell; 57, winding drum; 6, anti-detachment device; 61, slider; 62, baffle; 63, chute; 64, threaded rod; 65, limiting rod; 7, limiting plate; 8, double-headed screw; 9, connecting block. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1 to 9 , the present invention provides a technical solution:

[0031] A hoisting device for steel structure construction, including a support plate 1, a connecting plate 2 is rotatably arranged at the upper end of the support plate 1, a hanging part 3 connected to the hook of a hoisting machine is arranged above the connecting plate 2, a protection device 4 for fixing the hanging part 3 is arranged inside the connecting plate 2, a group of limiting plates 7 are slidably installed at the bottom of the support plate 1, a binding device 5 for fixing the steel plate is arranged at the bottom of the limiting plate 7, and an anti-detachment device 6 is arranged on the side wall of the limiting plate 7.

[0032] Specifically, as Figures 1-2 shown, the binding device 5 includes a motor 51, a winding drum 57 is fixedly installed on the power output shaft of the motor 51, an iron chain 52 is wound around the outer side wall of the winding drum 57, a fastening plate 53 is fixedly installed at one end of the iron chain 52, and a suspension hook 54 matching the fastening plate 53 is fixedly installed at one end of the limiting plate 7.

[0033] By adopting the above technical solution, the support plate 1 is used to support the connecting plate 2, and the hanging part 3 can be conveniently connected to the hook at the output end of the hoist, so as to realize the lifting of the steel structure; the motor 51 is a servo motor in the prior art, and the output end of the motor 51 can rotate at a certain frequency in different directions; by arranging a set of slidable limiting plates 7 at the bottom of the support plate 1, the winding drum 57 is driven by the motor 51 to rotate, so that the winding drum 57 controls the contraction and release of the iron chain 52, and then the fastening plate 53 is connected to the suspension hook 54, so as to realize the binding process of the steel structure, change the traditional way of manually sorting the chain, prevent the chains from being entangled and disordered, and improve the lifting efficiency of the steel structure. Among them, the anti-dropping device 6 can fix the iron chain 52, so that the iron chain 52 is firmly fixed to the steel structure. The protection device 4 can firmly fix the output end of the hoist and the hanging part 3, and it is not easy to have the phenomenon of unhooking.

[0034] Specifically, as Figures 1-2 shown, a groove 55 is opened on the upper surface of one end of the limiting plate 7, the motor 51 is fixedly installed in the groove 55, and a protective shell 56 is fixedly installed on the upper surface of the limiting plate 7 above the winding drum 57. One end of the iron chain 52 is fixedly installed on the outer side wall of the winding drum 57, and the end of the iron chain 52 far from the winding drum 57 penetrates through the limiting plate 7 and extends to the bottom of the limiting plate 7.

[0035] By adopting the above technical solution, the groove 55 is used for storing the motor 51, and at the same time provides a moving space for the winding drum 57 to contract the iron chain 52; the protective shell 56 can protect the winding drum 57, and the protective shell 56 is fixedly connected to the limiting plate 7 by screws, which is convenient for the later maintenance of the winding drum 57. When it is necessary to lift the steel plate, only need to start the motor 51, make the motor 51 drive the winding drum 57 to rotate, control the tightness of the iron chain 52, then pull one end of the iron chain 52 to make the fastening plate 53 buckle with the suspension hook 54, and then use the motor 51 to make the winding drum 57 rotate to tighten the iron chain 52, so that the fastening plate 53 is firmly fixed to the suspension hook 54, so that the iron chain 52 can firmly fix the steel structure. When it is necessary to disconnect the fastening plate 53 from the suspension hook 54, only need to rotate the motor 51 to make the motor 51 drive the winding drum 57 to rotate, so as to conveniently disconnect the fastening plate 53 from the suspension hook 54 and realize the disconnection of the iron chain 52, so as to facilitate the taking of the steel plate.

[0036] Specifically, as Figures 1-6 shown, the anti-dropping device 6 includes a sliding groove 63, the sliding groove 63 is opened on one end face of the limiting plate 7, a sliding block 61 is slidably installed inside the sliding groove 63, the sliding block 61 is in an L shape, and the end of the sliding block 61 far from the sliding groove 63 extends to the bottom of the limiting plate 7.

[0037] By adopting the above technical solution, the sliding groove 63 provides a sliding space for the slider 61. The L-shaped slider 61 can extend the main body part of the slider 61 below the limiting plate 7. One end of the slider 61 located in the sliding groove 63 is in a T shape, so that the slider 61 will not break away when sliding inside the sliding groove 63.

[0038] Specifically, as Figures 1-6 shown, a threaded rod 64 is rotatably installed inside the sliding groove 63. The threaded rod 64 is in screw drive with the slider 61. One end of the threaded rod 64 extends outside the limiting plate 7. A group of limiting rods 65 are fixedly installed on the outer side wall of the slider 61. The two limiting rods 65 are symmetrical about the horizontal center axis of the slider 61. The limiting rod 65 is in a T shape.

[0039] By adopting the above technical solution, the T-shaped threaded rod 64 is convenient to hold by hand. In addition, the T-shaped limiting rod 65 can limit the iron chain 52. When the threaded rod 64 rotates, due to the screw drive between the threaded rod 64 and the slider 61, the threaded rod 64 will cause the slider 61 to generate axial movement and a large axial thrust. Therefore, the threaded rod 64 can make the slider 61 slide inside the sliding groove 63, so that the slider 61 can be displaced. In addition, a baffle 62 is fixedly installed on the outer side wall of the limiting plate 7 at the bottom of the winding drum 57. One end of the limiting rod 65 away from the slider 61 penetrates through the baffle 62. The baffle 62 is parallel to the slider 61. When it is necessary to fix the iron chain 52, only need to rotate the threaded rod 64 to drive the slider 61 to slide inside the sliding groove 63, so that the distance between the slider 61 and the baffle 62 is close, thereby realizing the extrusion of the iron chain 52, so that the iron chain 52 will not break away, realizing the fixation of the chain during work, changing the traditional method of manually tying the chain in a knot, and further enabling the steel structure to remain stable during hoisting and avoiding potential safety hazards.

[0040] Specifically, as Figures 1-6 shown, a connection groove is opened at the bottom of the support plate 1. A double-headed screw rod 8 is rotatably installed inside the connection groove. One end of the double-headed screw rod 8 extends outside the support plate 1. A group of connection blocks 9 are threadedly connected to the outer side wall of the double-headed screw rod 8. The connection block 9 is in a T shape. The bottom of the connection block 9 is fixedly connected to the upper surface of the limiting plate 7.

[0041] By adopting the above technical solution, the connection groove provides a sliding space for the connection block 9. The T-shaped connection block 9 can prevent it from breaking away when sliding inside the connection groove. When the double-headed screw rod 8 is rotated, the double-headed screw rod 8 will drive the connection block 9 to slide inside the connection groove, and the distance between the two limiting plates 7 can be adjusted.

[0042] Specifically, asFigures 1-9 As shown, the protection device 4 includes a fixed rod 46. The connecting plate 2 is U-shaped. There are two fixed rods 46, which are symmetrically installed on the inner wall of the U-shaped opening end of the connecting plate 2. The hanging member 3 is fixedly installed at the center of the U-shaped opening end of the connecting plate 2. A transmission plate 44 is rotatably installed on the outer side wall of the fixed rod 46. The mutually approaching ends of the transmission plates 44 are rotatably connected to the two ends of the hanging member 3. The transmission plate 44 is arc-shaped. One end of one of the transmission plates 44 is rotatably installed with a buckle plate 41, and one end of the other transmission plate 44 is rotatably installed with a deduction plate 43.

[0043] By adopting the above technical solution, the fixed rod 46 plays the role of a fulcrum, facilitating the rotation of the transmission plate 44. A torsion spring is fixed on the outer side wall of the fixed rod 46. The end of the torsion spring away from the fixed rod 46 is fixedly connected to the outer side wall of the transmission plate 44. The elastic force provided by the torsion spring enables the transmission plate 44 to maintain a reset trend. Among them, the buckle plate 41 is U-shaped. Sliding blocks 48 are fixedly installed on the inner wall of the U-shaped opening end of the buckle plate 41. A first extrusion plate 42 is fixedly installed on the upper surface of one end of the buckle plate 41. A set of symmetric deduction grooves 47 are formed on the outer side wall of the deduction plate 43. The sliding blocks 48 are matched with the deduction grooves 47. The deduction grooves 47 provide a sliding space for the sliding blocks 48, enabling the buckle plate 41 not to break away when sliding on the outer side wall of the deduction plate 43.

[0044] Specifically, as Figures 1-9 shown, a second extrusion plate 45 is fixedly installed on the upper surface of one end of the deduction plate 43. The first extrusion plate 42 is parallel to the second extrusion plate 45.

[0045] By adopting the above technical solution, since the first extrusion plate 42 is parallel to the second extrusion plate 45, when the hook at the output end of the crane is connected to the hanging member 3, the hanging member 3 will drive the two transmission plates 44 to rotate around the fixed rod 46. The two transmission plates 44 will drive the buckle plate 41 to slide around the outer side wall of the deduction plate 43, so that the two first extrusion plates 42 and the second extrusion plate 45 approach each other to squeeze the rope at the output end of the crane, realizing the extrusion fixation of the rope at the output end of the crane and the limit of the crane hook, thereby preventing the crane from unhooking during the lifting and lowering of the steel structure and avoiding the occurrence of potential safety hazards.

[0046] Working principle: When it is necessary to lift the steel plate, only need to start the motor 51, make the motor 51 drive the winding drum 57 to rotate, control the tightness of the iron chain 52, then pull one end of the iron chain 52 to make the fastening plate 53 engage with the suspension hook 54, and then use the motor 51 to make the winding drum 57 rotate to tighten the iron chain 52, so that the fastening plate 53 and the suspension hook 54 are firmly fixed, and the iron chain 52 can firmly fix the steel structure. When it is necessary to disconnect the fastening plate 53 from the suspension hook 54, only need to rotate the motor 51 to make the motor 51 drive the winding drum 57 to rotate, so as to facilitate the disengagement of the fastening plate 53 from the suspension hook 54, realize the disengagement of the iron chain 52, and thus facilitate the taking of the steel plate. When it is necessary to fix the iron chain 52, only need to rotate the threaded rod 64 to make the threaded rod 64 drive the slider 61 to slide inside the chute 63, so that the distance between the slider 61 and the baffle 62 is close, so as to realize the extrusion of the iron chain 52, so that the iron chain 52 will not disengage, and realize the fixation of the chain during work, changing the traditional way of manually tying and binding the chain, so that the steel structure can remain stable during the lifting process and avoid potential safety hazards. Finally, when the hook at the output end of the hoist is connected to the hanging part 3, the hanging part 3 will drive the two transmission plates 44 to rotate around the fixed rod 46, and the two transmission plates 44 will drive the buckle plate 41 to slide around the outer wall of the deduction plate 43, so that the two first pressing plates 42 and the second pressing plate 45 approach to squeeze the rope at the output end of the hoist, realize the extrusion fixation of the rope at the output end of the hoist, and limit the hoist hook, so as to prevent the hoist from unhooking during the lifting and lowering process of the steel structure and avoid potential safety hazards.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hoisting device for steel structure construction, comprising a support plate (1), a connecting plate (2) being rotatably mounted on the upper end of the support plate (1), a hanging member (3) connected to a hook of a crane being disposed above the connecting plate (2), characterized in that: A protective device (4) for fixing the hanging part (3) is provided inside the connecting plate (2); a group of limit plates (7) are slidably mounted at the bottom of the supporting plate (1); a binding device (5) for fixing the steel plate is provided at the bottom of the limit plate (7); and an anti-falling device (6) is provided on the side wall of the limit plate (7); the binding device (5) comprises a motor (51); a winding drum (57) is fixedly mounted on the power output shaft of the motor (51); an iron chain (52) is wound around the outer wall of the winding drum (57); a buckling plate (53) is fixedly mounted on one end of the iron chain (52); and a suspension hook (54) matching the buckling plate (53) is fixedly mounted on one end of the limit plate (7); The anti-falling device (6) comprises a slide groove (63), wherein the slide groove (63) is formed on an end surface of the limiting plate (7), a slider (61) is slidably mounted inside the slide groove (63), and the slider (61) is L-shaped, and an end of the slider (61) away from the slide groove (63) extends to the bottom of the limiting plate (7); A threaded rod (64) is rotatably mounted inside the slide groove (63), and a screw transmission is performed between the threaded rod (64) and the slider (61). One end of the threaded rod (64) extends to the outside of the limit plate (7), and a group of limit rods (65) are fixedly mounted on the outer side wall of the slider (61). The two limit rods (65) are symmetrical about the transverse center axis of the slider (61), and the limit rods (65) are T-shaped. A baffle (62) is fixedly mounted on the outer side wall of the limit plate (7) at the bottom of the winding drum (57); one end of the limit rod (65) away from the slider (61) passes through the baffle (62); and the baffle (62) is parallel to the slider (61).

2. The hoisting equipment for steel structure construction according to claim 1, characterized in that: A groove (55) is formed on the upper surface of one end of the limit plate (7), and the motor (51) is fixedly mounted in the groove (55). A protective housing (56) is fixedly mounted on the upper surface of the limit plate (7) above the winding drum (57).

3. The hoisting equipment for steel structure construction according to claim 2, characterized in that: One end of the iron chain (52) is fixedly mounted on the outer wall of the winding drum (57), and one end of the iron chain (52) away from the winding drum (57) passes through the limiting plate (7) and extends to the bottom of the limiting plate (7).

4. The hoisting equipment for steel structure construction according to claim 1, characterized in that: A connecting groove is provided at the bottom of the support plate (1), a double-headed screw (8) is rotatably mounted inside the connecting groove, one end of the double-headed screw (8) extends to the outside of the support plate (1), and a group of connecting blocks (9) are threadedly connected to the outer wall of the double-headed screw (8), the connecting block (9) is in a T shape, and the bottom of the connecting block (9) is fixedly connected to the upper surface of the limiting plate (7).

5. The hoisting equipment for steel structure construction according to claim 1, characterized in that: The protective device (4) comprises a fixing rod (46), the connecting plate (2) is in a U shape, there are two fixing rods (46) which are symmetrically mounted on the inner wall of the U-shaped opening end of the connecting plate (2), and the hanging piece (3) is fixedly mounted at the center of the U-shaped opening end of the connecting plate (2).

6. The hoisting equipment for steel structure construction according to claim 5, characterized in that: A transmission plate (44) is rotatably mounted on the outer side wall of the fixing rod (46); one end of the transmission plate (44) close to each other is rotatably connected to two ends of the hanger (3); the transmission plate (44) is arc-shaped; one end of one of the transmission plates (44) is rotatably mounted with a snap plate (41); and one end of the other transmission plate (44) is rotatably mounted with a buckle plate (43).

7. The hoisting equipment for steel structure construction according to claim 6, characterized in that: The buckle plate (41) is in a U shape, and a sliding block (48) is fixedly mounted on the inner wall of the U-shaped opening end of the buckle plate (41). A first extrusion plate (42) is fixedly mounted on the upper surface of one end of the buckle plate (41). A group of symmetrical buckle grooves (47) are formed on the outer wall of the buckle plate (43). The sliding block (48) matches the buckle grooves (47). A second extrusion plate (45) is fixedly mounted on the upper surface of one end of the buckle plate (43), and the first extrusion plate (42) is parallel to the second extrusion plate (45).

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