A kind of weight moving mechanism of metering and weighing vehicle

Abstract

The application belongs to the technical field of metrological weighing equipment, and discloses a weight mobilization mechanism of a metrological weighing vehicle, which comprises a mounting seat, the mounting seat can be fixed on the rear end of the carriage of the metrological weighing vehicle through bolts, the upper surface of the mounting seat is provided with a motor A, the output end of the motor A is fixedly connected with a main adjusting arm, the upper surface of one end of the main adjusting arm is provided with an adjusting structure, the adjusting structure comprises a sliding assembly and a rotating assembly, the sliding assembly comprises a sliding groove which is arranged in the main adjusting arm, a plurality of clamping teeth are fixedly connected to one side of the inner wall of the sliding groove, the clamping teeth are uniformly distributed, a lower sliding plate is slidably connected to the lower end of the inner wall of the sliding groove close to the clamping teeth, the lower surface of the lower sliding plate is fixedly connected with a motor B, the output end of the motor B penetrates through the inside of the lower sliding plate, and the output end of the motor B is fixedly connected with a gear wheel. The application has the advantages that the metrological weighing vehicle can flexibly mobilize the weights in a small space.

Description

Technical Field

[0001] This invention belongs to the field of metrology and weighing equipment technology, specifically a weight adjustment mechanism for a metrology and weighing vehicle. Background Technology

[0002] A weighing and calibration vehicle, also known as a road-mobile weighing and calibration vehicle, is a special type of vehicle used by technical supervision and metrology departments to inspect weighbridges. It is mainly used for on-site calibration of large static weighing instruments and dynamic weighing instruments on highways, offering high accuracy and high efficiency.

[0003] The weighing and verification vehicle consists of a vehicle chassis, cargo box, weights, crane and other components. The weights are moved by a hydraulic crane.

[0004] Chinese Patent CN215471102U discloses a weight-grabbing device for a weighing and inspection vehicle, relating to the field of weighing and inspection vehicle technology. To address the inconvenience of hooking weights in existing technologies, this patent includes a vehicle frame and a robotic arm mounted on the frame. The end of the robotic arm is connected to a rotary gripper mechanism. The rotary gripper mechanism includes a rotating component and a gripper component, which is connected to the robotic arm via the rotating component. The gripper component includes a fixed rod, an L-shaped swing arm, a mounting base, and a telescopic drive component. The upper end of the L-shaped swing arm is connected to the mounting base via a pin. The mounting base is connected to the rotating component. The fixed rod is inclinedly connected to the rotating component and has a through hole adapted to the end of the L-shaped swing arm. Both ends of the telescopic drive component are connected to the fixed rod and the L-shaped swing arm, respectively.

[0005] The inventors discovered that, in light of the aforementioned patented technologies and existing technologies, most existing weighing and inspection vehicles are equipped with hydraulic lifting equipment. The boom of a hydraulic lifting vehicle is quite long when fully extended, requiring a large lateral space and height range to hook up weights. Due to the special nature of the weighing and inspection vehicle's operation, it needs to be weighed at different dynamic and static weighing positions in various environments. This can lead to the crane boom being unable to extend in confined spaces, requiring manual assistance from a forklift to move the weights, increasing costs and time consumption. This hinders weight movement and increases the difficulty of inspection, thus reducing the working efficiency of the weighing and inspection vehicle to some extent. Summary of the Invention

[0006] The purpose of this invention is to provide a weight adjustment mechanism for a weighing and balancing vehicle to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a weight adjustment mechanism for a weighing and balancing vehicle, comprising a mounting base, the mounting base being fixed to the rear end of the vehicle compartment of the weighing and balancing vehicle by bolts, a motor A being mounted on the upper surface of the mounting base, a main adjusting arm being fixedly connected to the output end of the motor A, and an adjusting structure being provided on the upper surface of one end of the main adjusting arm, the adjusting structure comprising a sliding component and a rotating component.

[0008] Preferably, the sliding assembly includes a slide groove formed inside the main adjusting arm. A plurality of locking teeth are fixedly connected to one side of the inner wall of the slide groove, and the locking teeth are evenly distributed. A lower slide plate is slidably connected to the inner wall of the slide groove near the lower end of the locking teeth. A motor B is fixedly connected to the lower surface of the lower slide plate. The output end of the motor B passes through the interior of the lower slide plate. A gear is fixedly connected to the output end of the motor B. The gear meshes with the plurality of locking teeth. An upper slide plate is slidably connected to the inner wall of the slide groove near the upper end of the locking teeth. A connecting rod is fixedly connected to the upper end of the gear. The connecting rod passes through the interior of the upper slide plate.

[0009] Preferably, the rotating assembly includes a fixed base, the lower surface of which is fixedly connected to the upper slide plate. A motor C is fixedly connected inside the fixed base, and a disc is fixedly connected to the output end of the motor C. Two slide rails are fixedly connected to the surface of the disc, and a secondary adjusting arm is slidably connected to the inner wall of the two slide rails. A hydraulic cylinder A is fixedly connected to the relative position of the upper surface of the two slide rails. A positioning plate is fixedly connected to the upper surface of the secondary adjusting arm corresponding to the relative position of the two slide rails, and the output end of the hydraulic cylinder A is fixedly connected to the positioning plate.

[0010] Preferably, limiting grooves are provided on both sides of the inner wall of the slide groove, corresponding to the positions of the upper slide plate and the lower slide plate, and both sides of the upper slide plate and the lower slide plate are slidably connected to the inner wall of the limiting groove.

[0011] Preferably, a circular rail is fixedly connected to the upper surface of the main adjusting arm with the fixed seat as the center. The surface of the circular rail is provided with a groove. Sliding blocks are fixedly connected to the lower surfaces of the two sliding rails. The lower ends of the sliding blocks are slidably connected to the inner wall of the groove. Two support members are fixedly connected to the inner wall of the circular rail. One end of the support member is fixedly connected to the main adjusting arm.

[0012] Preferably, the auxiliary adjusting arm has a lifting structure on the side away from the hydraulic cylinder A. The lifting structure includes a lifting seat, which is L-shaped. One side of the lifting seat is fixedly connected to the auxiliary adjusting arm. An opening is provided on the surface of the lifting seat. A stabilizing block is fixedly connected to the L-shaped bend of the lifting seat. A hydraulic cylinder B is fixedly connected to the upper surface of the lifting seat. A T-shaped piece is fixedly connected to the output end of the hydraulic cylinder B. The lower end of the T-shaped piece is adapted to the opening on the surface of the lifting seat. A lifting hook is installed on the lower surface of the T-shaped piece.

[0013] Preferably, the lower surface of the hoisting base is fixedly connected to both sides of the opening, and the inner wall of the limiting block is rotatably connected to the limiting wheel.

[0014] Preferably, the end of the main adjusting arm away from the circular rail is provided with a counterweight structure. The counterweight structure includes a counterweight plate. The lower surface of the counterweight plate is fixedly connected to the main adjusting arm. The upper surface of the counterweight plate is fixedly connected to a clamping plate near the four corners. The clamping plate is bent at an "L" shape at a right angle.

[0015] Preferably, the upper end of the card plate is provided with a square groove, the inner wall of the square groove is rotatably connected to a rotating block, the lower surface of the rotating block is fixedly connected to a fixing block, the surface of the fixing block is provided with a screw hole, and a fixing bolt is inserted through one side of the card plate at the position corresponding to the screw hole.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention utilizes a sliding component and a rotating component. Motor B rotates, causing a gear to rotate within a sliding groove, and its meshing teeth move relative to the gear. This allows the upper and lower sliding plates to slide within the groove, enabling position adjustments based on the weights placed in the weighing and inspection vehicle's cargo box. This allows for convenient adjustment of the weight placement without requiring a large space. Simultaneously, motor C drives a disc at its upper end to rotate a slide rail. After the weights are hoisted, the slide rail can be rotated to the corresponding weighing position for placement. The cooperation between the sliding and rotating components allows for weight movement operations without requiring excessive height or space, effectively improving the applicability of the weighing and inspection vehicle in confined spaces.

[0018] 2. The present invention, through the setting of the hoisting structure, allows the weight to be hung on the hoisting hook by two hoisting ropes. Then, the hydraulic cylinder B outputs, driving the hoisting hook to lift the weight upward. During the upward lifting process, the limit wheel limits and tightens the two hoisting ropes, making the weight more stable during the hoisting process, so as to facilitate the next step of adjustment.

[0019] 3. The present invention uses a counterweight structure to place a counterweight block on the surface of a counterweight plate and limit it with a clamping plate. At the same time, the rotating block can be rotated and the fixing bolt is screwed into the interior of the fixing block to fix the rotating block. The rotating block is used to further limit the upper part of the counterweight block. The counterweight block is used to balance the weight of the main adjusting arm when adjusting the weight, making the adjustment process more stable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the lower structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged view of point A in the image;

[0023] Figure 4 This is a cross-sectional view of the main adjusting arm and its upper structure used in this invention;

[0024] Figure 5 This is a partial schematic diagram illustrating the adjustment structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the hoisting structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the counterweight structure of the present invention;

[0027] Figure 8 This is a schematic diagram illustrating the upper structure of one of the card plates in this invention.

[0028] In the diagram: 1. Mounting base; 2. Motor A; 3. Main adjusting arm; 4. Adjusting structure; 41. Sliding assembly; 411. Slide groove; 412. Clamping tooth; 413. Lower sliding plate; 414. Motor B; 415. Gear; 416. Upper sliding plate; 417. Limiting groove; 42. Rotating assembly; 421. Fixed base; 422. Motor C; 423. Slide rail; 424. Secondary adjusting arm; 425. Hydraulic cylinder A; 426. Positioning plate; 43. Circular rail; 44. Sliding block; 45. Support component; 5. Lifting structure; 51. Lifting base; 511. Stabilizing block; 52. Hydraulic cylinder B; 521. T-shaped component; 522. Lifting hook; 53. Limiting block; 531. Limiting wheel; 6. Counterweight structure; 61. Counterweight plate; 62. Clamping plate; 63. Rotating block; 64. Fixed block; 65. Fixing bolt. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 8As shown, this embodiment of the invention provides a weight adjustment mechanism for a weighing and verification vehicle, including a mounting base 1. The mounting base 1 can be fixed to the rear end of the vehicle body of the weighing and verification vehicle by bolts. A motor A2 is mounted on the upper surface of the mounting base 1. The output end of the motor A2 is fixedly connected to a main adjusting arm 3. An adjusting structure 4 is provided on the upper surface of one end of the main adjusting arm 3. The adjusting structure 4 includes a sliding component 41 and a rotating component 42.

[0031] By adjusting the coordination of the sliding component 41 and the rotating component 42 in structure 4, the position of the weight can be freely adjusted in a narrow space, effectively improving the versatility of the weighing and inspection vehicle.

[0032] In one embodiment, such as Figures 2 to 5 As shown, the sliding assembly 41 includes a slide groove 411 opened inside the main adjusting arm 3. A number of locking teeth 412 are fixedly connected to one side of the inner wall of the slide groove 411. The locking teeth 412 are evenly distributed. A lower slide plate 413 is slidably connected to the lower end of the inner wall of the slide groove 411 near the locking teeth 412. A motor B414 is fixedly connected to the lower surface of the lower slide plate 413. The output end of the motor B414 passes through the interior of the lower slide plate 413. A gear 415 is fixedly connected to the output end of the motor B414. The gear 415 meshes with the locking teeth 412. An upper slide plate 416 is slidably connected to the upper end of the inner wall of the slide groove 411 near the locking teeth 412. A connecting rod is fixedly connected to the upper end of the gear 415. The connecting rod passes through the interior of the upper slide plate 416.

[0033] The rotating assembly 42 includes a fixed base 421. The lower surface of the fixed base 421 is fixedly connected to the upper slide plate 416. A motor C422 is fixedly connected inside the fixed base 421. A disc is fixedly connected to the output end of the motor C422. Two slide rails 423 are fixedly connected to the surface of the disc. A secondary adjusting arm 424 is slidably connected to the inner wall of the two slide rails 423. A hydraulic cylinder A425 is fixedly connected to the relative position of the upper surface of the two slide rails 423. A positioning plate 426 is fixedly connected to the upper surface of the secondary adjusting arm 424 corresponding to the relative position of the two slide rails 423. The output end of the hydraulic cylinder A425 is fixedly connected to the positioning plate 426.

[0034] The beneficial effects of the above technical solution are as follows: Through the cooperation of the sliding component 41 and the rotating component 42, the rotation of the motor B414 causes the gear 415 to rotate in the slide groove 411, and the meshing teeth 412 move relative to it, thereby causing the upper slide plate 416 and the lower slide plate 413 to slide horizontally in the slide groove 411. This allows for position adjustment according to the weights placed in the cargo box of the weighing and inspection vehicle, thus conveniently adjusting the position of the weights to be hoisted as needed without requiring a large space. At the same time, the drive of the motor C422 causes the upper disc to drive the slide rail 423 to rotate, so that after the weights are hoisted, the slide rail 423 can be rotated to the corresponding weighing instrument position for the placement of the weights. Through the cooperation of the sliding component 41 and the rotating component 42, the weight adjustment operation can be carried out jointly according to the current space without requiring excessive height space.

[0035] Among them, limit grooves 417 are provided on both sides of the inner wall of the slide groove 411, corresponding to the positions of the upper slide plate 416 and the lower slide plate 413 respectively, and the two sides of the upper slide plate 416 and the lower slide plate 413 are slidably connected to the inner wall of the limit groove 417.

[0036] The beneficial effects of the above technical solution are as follows: by setting the limiting groove 417, the upper sliding plate 416 and the lower sliding plate 413 are effectively limited, thereby ensuring the stability of the motor B414 when driving the gear 415 and the locking tooth 412 to slide together.

[0037] Among them, the upper surface of the main adjusting arm 3 is fixedly connected to a circular rail 43 with the fixed base 421 as the center. The surface of the circular rail 43 is provided with a groove. The lower surface of the two sliding rails 423 is fixedly connected to a sliding block 44. The lower end of the sliding block 44 is slidably connected to the inner wall of the groove. The inner wall of the circular rail 43 is fixedly connected to two support members 45. One end of the support member 45 is fixedly connected to the main adjusting arm 3.

[0038] The beneficial effects of the above technical solution are as follows: by setting the circular rail 43, when the motor B414 drives the slide rail 423 to rotate, the sliding block 44 always slides in the groove on the surface of the circular rail 43 to support the slide rail 423 and make its rotation more stable.

[0039] In one embodiment, such as Figure 1 and Figure 6As shown, a lifting structure 5 is provided on the side of the auxiliary adjusting arm 424 away from the hydraulic cylinder A425. The lifting structure 5 includes a lifting seat 51, which is L-shaped. One side of the lifting seat 51 is fixedly connected to the auxiliary adjusting arm 424. An opening is provided on the surface of the lifting seat 51. A stabilizing block 511 is fixedly connected to the L-shaped bend of the lifting seat 51. A hydraulic cylinder B52 is fixedly connected to the upper surface of the lifting seat 51. A T-shaped piece 521 is fixedly connected to the output end of the hydraulic cylinder B52. The lower end of the T-shaped piece 521 is adapted to the opening on the surface of the lifting seat 51. A lifting hook 522 is installed on the lower surface of the T-shaped piece 521.

[0040] The beneficial effects of the above technical solution are as follows: by setting up the hoisting structure 5, the weight can be hung on the hoisting hook 522 by two hoisting ropes. Then, the hydraulic cylinder B52 outputs, driving the hoisting hook 522 to lift the weight upward, and then proceed to the next step of adjustment.

[0041] Among them, the lower surface of the hoisting base 51 is fixedly connected to both sides of the opening, and the inner wall of the limit block 53 is rotatably connected to the limit wheel 531.

[0042] The beneficial effects of the above technical solution are as follows: by setting the limit wheel 531, when lifting the weight, the lifting rope can be placed on the surface of the limit wheel 531. Then, when the hydraulic cylinder B52 lifts, it avoids the lifting hook 522 from pulling the weight lifting rope upward and causing friction with the lifting seat 51. At the same time, the two limit wheels 531 press and limit the lifting rope to prevent the lifting rope from rotating and making the weight unstable.

[0043] In one embodiment, such as Figure 7 and Figure 8 As shown, the main adjusting arm 3 is provided with a counterweight structure 6 at the end away from the circular rail 43. The counterweight structure 6 includes a counterweight plate 61. The lower surface of the counterweight plate 61 is fixedly connected to the main adjusting arm 3. The upper surface of the counterweight plate 61 is fixedly connected with a clamping plate 62 near the four corners. The clamping plate 62 is bent at an "L" shape at a right angle.

[0044] The beneficial effects of the above technical solution are as follows: by setting the counterweight structure 6, a counterweight block is placed on the surface of the counterweight plate 61 and limited by the clamping plate 62, which is used to balance the weight of the main adjusting arm 3 on the left and right sides when adjusting the weight, so that the adjustment process is more stable.

[0045] The upper end of the card plate 62 is provided with a square groove, the inner wall of the square groove is rotatably connected to a rotating block 63, the lower surface of the rotating block 63 is fixedly connected to a fixing block 64, the surface of the fixing block 64 is provided with a screw hole, and a fixing bolt 65 is inserted through one side of the card plate 62 at the position corresponding to the screw hole.

[0046] The beneficial effects of the above technical solution are as follows: by setting the rotating block 63, after the counterweight is added to the surface of the counterweight plate 61, the rotating block 63 is rotated and the fixing bolt 65 is screwed into the screw hole on the surface of the fixing block 64 to fix the rotating block 63, thereby limiting and fixing the counterweight.

[0047] Working principle and usage process:

[0048] When inspecting a weighing instrument in a confined space, the motor B414 first drives the gear 415 to rotate and engage with the locking teeth 412 for lateral movement. This causes the upper slide plate 416 and lower slide plate 413 to slide within the slide groove 411, thereby causing the upper slide rail 423 and the auxiliary adjusting arm 424 to move laterally on the surface of the main adjusting arm 3. This allows for adjustment based on the placement of the weights in the weighing and inspection vehicle's cargo box. Subsequently, the hydraulic cylinder A425 drives the auxiliary adjusting arm 424 to slide, extend, or retract within the slide rail 423, thus... The lifting base 51 is adjusted to the upper end of the weight, and then the weight is connected to the lifting hook 522 by the lifting rope. The hydraulic cylinder B52 outputs, so that the weight is lifted. Then, according to the current space size, the motor A2 rotates to drive the entire main adjusting arm 3 to rotate, and the motor C422 rotates synchronously to drive the entire auxiliary adjusting arm 424 to rotate, so as to move the lifted weight out of the cargo box. With the joint action of motor A2, motor B414, motor C422 and hydraulic cylinder A425, the weight can be moved effectively in a narrow space.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A weight adjustment mechanism for a weighing and balancing vehicle, comprising a mounting base (1), characterized in that: The mounting base (1) can be fixed to the rear end of the carriage of the weighing and inspection vehicle by bolts. A motor A (2) is installed on the upper surface of the mounting base (1). The output end of the motor A (2) is fixedly connected to the main adjusting arm (3). An adjusting structure (4) is provided on the upper surface of one end of the main adjusting arm (3). The adjusting structure (4) includes a sliding component (41) and a rotating component (42). The sliding assembly (41) includes a slide groove (411) opened inside the main adjusting arm (3). A plurality of locking teeth (412) are fixedly connected to one side of the inner wall of the slide groove (411). The locking teeth (412) are evenly distributed. A lower slide plate (413) is slidably connected to the lower end of the inner wall of the slide groove (411) near the locking teeth (412). A motor B (414) is fixedly connected to the lower surface of the lower slide plate (413). The output end of the motor B (414) passes through the interior of the lower slide plate (413). A gear (415) is fixedly connected to the output end of the motor B (414). The gear (415) meshes with the plurality of locking teeth (412). An upper slide plate (416) is slidably connected to the upper end of the inner wall of the slide groove (411) near the locking teeth (412). A connecting rod is fixedly connected to the upper end of the gear (415). The connecting rod passes through the interior of the upper slide plate (416). The rotating assembly (42) includes a fixed base (421), the lower surface of which is fixedly connected to the upper slide plate (416). A motor C (422) is fixedly connected inside the fixed base (421). A disc is fixedly connected to the output end of the motor C (422). Two slide rails (423) are fixedly connected to the surface of the disc. A secondary adjusting arm (424) is slidably connected to the inner wall of the two slide rails (423). A hydraulic cylinder A (425) is fixedly connected to the relative position of the upper surface of the two slide rails (423). A positioning plate (426) is fixedly connected to the upper surface of the secondary adjusting arm (424) corresponding to the relative position of the two slide rails (423). The output end of the hydraulic cylinder A (425) is fixedly connected to the positioning plate (426).

2. The weight adjustment mechanism of a weighing and verification vehicle according to claim 1, characterized in that: Limiting grooves (417) are provided on both sides of the inner wall of the slide groove (411) corresponding to the positions of the upper slide plate (416) and the lower slide plate (413), respectively. Both sides of the upper slide plate (416) and the lower slide plate (413) are slidably connected to the inner wall of the limiting groove (417).

3. The weight adjustment mechanism of a weighing and verification vehicle according to claim 1, characterized in that: The upper surface of the main adjusting arm (3) is fixedly connected to a circular rail (43) with the fixed seat (421) as the center. The surface of the circular rail (43) is provided with a groove. The lower surfaces of the two sliding rails (423) are fixedly connected to sliding blocks (44). The lower end of the sliding block (44) is slidably connected to the inner wall of the groove. The inner wall of the circular rail (43) is fixedly connected to two support members (45). One end of the support member (45) is fixedly connected to the main adjusting arm (3).

4. The weight adjustment mechanism of a weighing and verification vehicle according to claim 1, characterized in that: The auxiliary adjusting arm (424) is provided with a lifting structure (5) on the side away from the hydraulic cylinder A (425). The lifting structure (5) includes a lifting seat (51). The lifting seat (51) is "L" shaped. One side of the lifting seat (51) is fixedly connected to the auxiliary adjusting arm (424). An opening is provided on the surface of the lifting seat (51). A stabilizing block (511) is fixedly connected to the "L" shaped bend of the lifting seat (51). A hydraulic cylinder B (52) is fixedly connected to the upper surface of the lifting seat (51). A T-shaped piece (521) is fixedly connected to the output end of the hydraulic cylinder B (52). The lower end size of the T-shaped piece (521) is adapted to the opening on the surface of the lifting seat (51). A lifting hook (522) is installed on the lower surface of the T-shaped piece (521).

5. The weight adjustment mechanism of a weighing and verification vehicle according to claim 4, characterized in that: Limiting blocks (53) are fixedly connected to both sides of the opening on the lower surface of the hoisting base (51), and limiting wheels (531) are rotatably connected to the inner wall of the limiting blocks (53).

6. The weight adjustment mechanism of a weighing and verification vehicle according to claim 1, characterized in that: The main adjusting arm (3) is provided with a counterweight structure (6) at one end away from the circular rail (43). The counterweight structure (6) includes a counterweight plate (61). The lower surface of the counterweight plate (61) is fixedly connected to the main adjusting arm (3). The upper surface of the counterweight plate (61) is fixedly connected to a clamping plate (62) near the four corners. The clamping plate (62) is bent at an "L" shape.

7. The weight adjustment mechanism of a weighing and verification vehicle according to claim 6, characterized in that: The upper end of the card plate (62) is provided with a square groove, and a rotating block (63) is rotatably connected to the inner wall of the square groove. A fixing block (64) is fixedly connected to the lower surface of the rotating block (63). A screw hole is provided on the surface of the fixing block (64), and a fixing bolt (65) is provided on one side of the card plate (62) at the position corresponding to the screw hole.

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