A hydraulic numerical control bending machine with self-adjustable bending degree for steel structure production

Abstract

The application belongs to the technical field of steel production, and discloses a hydraulic numerical control bending machine with self-adjustable bending degree for steel structure production, which comprises a shell, the outer wall of the shell is provided with a pressing block, the front end outer wall of the shell is provided with a supporting mechanism, the inner wall of the shell is provided with an adjusting mechanism, the adjusting mechanism comprises a motor, the output shaft of the motor is fixedly connected with a threaded rod A, the outer wall of the threaded rod A is fixedly connected with a bevel gear A, the bottom end inner wall of the shell is fixedly connected with a guide telescopic rod, and the movable end of the guide telescopic rod is fixedly connected with a moving plate. Through the cooperation of the motor, the baffle A and other structures, the moving plate and the connecting rod can be moved up and down by starting the motor, the baffle A and the baffle B are jacked up, the opening and closing angle of the two baffles is changed, the adjustment of the bending degree is completed, and the problem that the operation of adjusting the bending degree is relatively complicated is solved, so that the application is more convenient and easy to operate.

Description

Technical Field

[0001] This invention belongs to the field of steel production technology, specifically a hydraulic CNC bending machine with self-adjustable bending for steel structure production. Background Technology

[0002] The hydraulic CNC bending machine for steel structure production is a machine used in the sheet metal industry. It is mainly used to bend thin plates. Its structure mainly includes a support, worktable, clamping plate, slider, oil cylinder, mechanical stop fine adjustment structure, synchronization system, and material stop mechanism. The bending machine uses hydraulic or mechanical transmission to make the slider move up and down, which cooperates with the lower die to achieve the bending of the sheet material.

[0003] Because the required bending angles for steel plates vary during steel structure production, some bending machines are equipped with adjustable bending angle components. However, in some existing technologies, adjusting the bending angle of the bending components is quite complex, requiring operators to spend a considerable amount of time setting and adjusting them. When different plates need to be bent to different angles, the process of adjusting the bending angle wastes a lot of time and reduces work efficiency. Therefore, to address the above problems, a self-adjusting hydraulic CNC bending machine for steel structure production is proposed. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a hydraulic CNC bending machine with self-adjustable bending angle for steel structure production, which solves the problem that the existing technology is inconvenient for adjusting the bending angle.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic CNC bending machine for steel structure production with self-adjustable bending, comprising a housing, a pressure block provided on the outer wall of the housing, a support mechanism provided on the front outer wall of the housing, and an adjustment mechanism provided on the inner wall of the housing; The adjustment mechanism includes a motor, the output shaft of which is fixedly connected to a threaded rod A, the outer wall of which is fixedly connected to a bevel gear A, the bottom inner wall of the housing is fixedly connected to a guide telescopic rod, the movable end of which is fixedly connected to a movable plate, the top outer wall of which is fixedly connected to a connecting rod, the top outer wall of which is hinged to a slider, the inner wall of the housing is rotatably connected to a rotating shaft A, the outer wall of which is fixedly connected to a baffle A, the inner wall of the housing is rotatably connected to a rotating shaft B, the outer wall of which is fixedly connected to a baffle B, and both the bottom outer walls of baffle A and baffle B are provided with sliding grooves.

[0006] Preferably, the motor is fixedly connected to the inner wall of the bottom end of the housing, the outer wall of the top end of the threaded rod A is rotatably connected to the inner wall of the top end of the housing, and the movable plate is threadedly connected to the outer wall of the threaded rod A.

[0007] Preferably, the slider is slidably connected to the inner wall of the groove, and the connecting rod is slidably connected to the inner wall of the housing.

[0008] Preferably, the outer wall of the baffle A is in contact with the outer wall of the baffle B, and the inner wall of the rotating shaft A is in contact with the outer wall of the rotating shaft B.

[0009] Preferably, the support mechanism includes a rotating rod, a bevel gear B fixedly connected to the right outer wall of the rotating rod, a bevel gear C fixedly connected to the left outer wall of the rotating rod, a bevel gear D meshing with the outer wall of the bevel gear C, a threaded rod B fixedly connected to the inner wall of the bevel gear D, an adjusting block slidably connected to the inner wall of the front end of the housing, a sliding plate slidably connected to the inner wall of the adjusting block, a moving rod fixedly connected to the top outer wall of the sliding plate, a support plate fixedly connected to the top outer wall of the moving rod, a fixing plate fixedly connected to the bottom outer wall of the adjusting block, a slot formed on the outer wall of the adjusting block, and a limit assembly provided on the front outer wall of the housing.

[0010] Preferably, the left outer wall of the rotating rod is rotatably connected to the outer wall of the fixed plate, the bevel gear B meshes with the bevel gear A, and the top outer wall of the threaded rod B is rotatably connected to the top inner wall of the adjusting block.

[0011] Preferably, the outer wall of the threaded rod B is threadedly connected to the inner wall of the sliding plate, and the moving rod passes through and is slidably connected to the inner wall of the adjusting block.

[0012] Preferably, the limiting component includes a fixing block, the inner wall of which is elastically connected to a locking block by a spring, and the outer wall of which is fixedly connected to a pull rod.

[0013] Preferably, the fixing block is fixedly connected to the front outer wall of the housing, one end of the spring is fixedly connected to the outer wall of the locking block, and the other end of the spring is fixedly connected to the inner wall of the fixing block.

[0014] Preferably, the outer wall of the card block is slidably connected to the inner wall of the fixing block, the card block is engaged with the card slot, and the pull rod passes through and is slidably connected to the left inner wall of the fixing block.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the cooperation of a motor and baffle A, allows for adjustment of the bendable angle. The motor rotates the threaded rod A, causing the moving plate and connecting rod to move up and down, lifting baffles A and B and flipping them to change their opening angle. A steel plate is then placed on baffles A and B, and a hydraulic cylinder moves a pressure block downwards to compress the steel plate, bending it to the same angle as baffles A and B. This solves the problem of cumbersome bending operations, making the process more convenient, faster, and easier to operate. This invention, through the cooperation of a threaded rod B and a support plate, allows the support plate to move synchronously while the motor starts and adjusts the angles of baffles A and B, keeping the tops of all three on the same horizontal line. The support plate can support the other end of the steel plate, and by moving the adjustment block, the support plate can move synchronously to support steel plates of different lengths. This solves the problem that operators need to constantly support the steel plate to keep it horizontal during bending, which wastes manpower and results in high labor intensity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional view of the housing, a schematic diagram of the adjustment mechanism, and a schematic diagram of the support mechanism of the present invention; Figure 3 This is a cross-sectional view of the housing and a schematic diagram of the adjustment mechanism of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram of section A; Figure 5 This is a structural schematic diagram of the present invention, showing the exploded structure of baffle A and baffle B. Figure 6 This is a schematic cross-sectional view of the support mechanism and adjusting block of the present invention; Figure 7 This is a cross-sectional view of the fixing block and a schematic diagram of the disassembled shell structure of the present invention.

[0017] In the diagram: 1. Housing; 2. Adjustment mechanism; 201. Motor; 202. Threaded rod A; 203. Bevel gear A; 204. Guide telescopic rod; 205. Moving plate; 206. Connecting rod; 207. Slider; 208. Slide groove; 209. Baffle A; 210. Rotating shaft A; 211. Baffle B; 212. Rotating shaft B; 3. Pressure block; 4. Support mechanism; 401. Rotating rod; 402. Bevel gear B; 403. Bevel gear C; 404. Bevel gear D; 405. Threaded rod B; 406. Sliding plate; 407. Moving rod; 408. Support plate; 409. Adjustment block; 410. Fixed plate; 411. Slot; 501. Fixed block; 502. Spring; 503. Pull rod; 504. Locking block. Detailed Implementation

[0018] 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.

[0019] like Figures 1 to 7 As shown, this invention provides a self-adjusting hydraulic CNC bending machine for steel structure production, comprising a housing 1, a pressure block 3 on the outer wall of the housing 1, a support mechanism 4 on the front outer wall of the housing 1, and an adjustment mechanism 2 on the inner wall of the housing 1. The adjustment mechanism 2 includes a motor 201, a threaded rod A202 fixedly connected to the output shaft of the motor 201, a bevel gear A203 fixedly connected to the outer wall of the threaded rod A202, and a guide telescopic rod 204 fixedly connected to the inner wall of the bottom end of the housing 1. A movable plate 205 is fixedly connected to the movable end of 04. A connecting rod 206 is fixedly connected to the top outer wall of the movable plate 205. A slider 207 is hinged to the top outer wall of the connecting rod 206. A rotating shaft A210 is rotatably connected to the inner wall of the housing 1. A baffle A209 is fixedly connected to the outer wall of the rotating shaft A210. A rotating shaft B212 is rotatably connected to the inner wall of the housing 1. A baffle B211 is fixedly connected to the outer wall of the rotating shaft B212. A groove 208 is provided on the bottom outer wall of both the baffle A209 and the baffle B211.

[0020] The above scheme is adopted as follows: the shell 1 is the main body of a hydraulic CNC bending machine with self-adjustable bending for steel structure production. The pressure block 3 is connected to the shell 1 through a hydraulic cylinder. The pressure block 3 is triangular in shape, which is existing technology. It can be controlled to move downward through the hydraulic cylinder to bend steel plates and other sheet materials. The steel plate can be placed above the baffle A209 and baffle B211 in the adjustment mechanism 2 and contact them simultaneously. The bottom contact points of the baffle A209 and baffle B211 correspond to the lowest position of the pressure block 3. When the pressure block 3 is pressed down, it can press the steel plate to the same angle as the baffle A209 and baffle B211. The opening angle of the two can be adjusted through the adjustment mechanism 2, so that the bending degree of the steel plate can be adjusted conveniently and quickly, which is convenient for operation.

[0021] like Figures 2 to 5 As shown, motor 201 is fixedly connected to the inner wall of the bottom end of housing 1, the outer wall of the top end of threaded rod A202 is rotatably connected to the inner wall of the top end of housing 1, moving plate 205 is threadedly connected to the outer wall of threaded rod A202, slider 207 is slidably connected to the inner wall of slide groove 208, connecting rod 206 is slidably connected to the inner wall of housing 1, baffle A209 is in contact with the outer wall of baffle B211, and the inner wall of rotating shaft A210 is in contact with the outer wall of rotating shaft B212.

[0022] The above scheme is adopted as follows: By starting the motor 201, the output shaft of the motor 201 can drive the threaded rod A202 to rotate. When the threaded rod A202 rotates, it drives the moving plate 205 to move. Since the guide telescopic rod 204 guides the moving plate 205, it maintains a vertical up-and-down movement. Four sets of connecting rods 206 are provided. Two sets of connecting rods 206 are provided on both the baffle A209 and the baffle B211. When the moving plate 205 moves upward, the connecting rods 206 move synchronously and lift the baffle A209 and the baffle B211 upward and flip them. Since the rotating shaft A210 is located inside the rotating shaft B212, the centers of the two are the same, thus the baffle A209 and the baffle B211... When plate B211 flips, the bottom corners of the two plates remain in contact and are symmetrical. As the moving plate 205 moves upward, the angle between them decreases. The connecting rod 206 flips along the inner wall of the slider 207, maintaining a vertical position, while the slider 207 moves along the inner wall of the groove 208. When the motor 201 is started, it drives the moving plate 205 to move downward. The connecting rod 206 drives the baffles A209 and B211 to flip downward, increasing the angle between them. This allows the steel plate to be placed on top of the baffles A209 and B211. The hydraulic cylinder drives the pressure block 3 to bend the plate. The angle at which the steel plate can be bent can be adjusted relatively easily according to requirements, making the operation convenient.

[0023] like Figure 6 and Figure 7 As shown, the support mechanism 4 includes a rotating rod 401. A bevel gear B402 is fixedly connected to the right outer wall of the rotating rod 401, and a bevel gear C403 is fixedly connected to the left outer wall of the rotating rod 401. A bevel gear D404 meshes with the outer wall of the bevel gear C403. A threaded rod B405 is fixedly connected to the inner wall of the bevel gear D404. An adjusting block 409 is slidably connected to the inner wall of the front end of the housing 1. A sliding plate 406 is slidably connected to the inner wall of the adjusting block 409. A moving rod 407 is fixedly connected to the outer wall of the top end of the sliding plate 406. A support plate 408 is fixedly connected to the outer wall of the top end of the moving rod 407. A fixing plate 410 is fixedly connected to the outer wall of the bottom end of the adjusting block 409. A slot 411 is provided on the outer wall of the adjusting block 409. A limit assembly is provided on the outer wall of the front end of the housing 1.

[0024] The above solution allows for the following: Support mechanism 4 can support the steel plate outside the shell 1 when the steel plate is long, eliminating the need for operators to support the steel plate during bending operations, thus saving effort and reducing operator workload. When the starting motor 201 drives the baffles A209 and B211 to rotate, their top positions move up and down. Simultaneously, the motor 201 drives the support mechanism 4, causing the pallet 408 to move up and down. The outer wall of the top of the pallet 408 remains on the same horizontal line as the tops of the baffles A209 and B211. One end of the steel plate to be bent can be placed on the tops of the baffles A209 and B211, while the other end can be placed on the pallet 408 for support, eliminating the need for operators to support the steel plate. Furthermore, the lateral position of the support mechanism 4 can be adjusted to accommodate steel plates of different sizes.

[0025] like Figure 6 and Figure 7 As shown, the left outer wall of the rotating rod 401 is rotatably connected to the outer wall of the fixed plate 410; the bevel gear B402 meshes with the bevel gear A203; the top outer wall of the threaded rod B405 is rotatably connected to the top inner wall of the adjusting block 409; the outer wall of the threaded rod B405 is threadedly connected to the inner wall of the sliding plate 406; the moving rod 407 passes through and is slidably connected to the inner wall of the adjusting block 409; the limiting assembly includes a fixed block 501, and the inner wall of the fixed block 501 is elastically connected to the spring 502. A locking block 504 is connected, and a pull rod 503 is fixedly connected to the outer wall of the locking block 504. A fixing block 501 is fixedly connected to the front outer wall of the housing 1. One end of a spring 502 is fixedly connected to the outer wall of the locking block 504, and the other end of the spring 502 is fixedly connected to the inner wall of the fixing block 501. The outer wall of the locking block 504 is slidably connected to the inner wall of the fixing block 501. The locking block 504 is engaged with the locking groove 411. The pull rod 503 passes through and is slidably connected to the left inner wall of the fixing block 501.

[0026] The above scheme is adopted as follows: the starting motor 201 drives the threaded rod A202 to rotate, which in turn drives the bevel gear A203 to rotate. The bevel gear A203 drives the bevel gear B402, which meshes with it, to rotate. The bevel gear B402 drives the rotating rod 401 to rotate. The rotating rod 401 and the bevel gear C403 fixed on its left side rotate simultaneously, driving the bevel gear D404 to rotate, so that the threaded rod B405 rotates synchronously. Since the threaded rod B405 is threadedly connected to the sliding plate 406, the sliding plate 406 can move up or down under the guidance of the four sets of moving rods 407, thereby driving the support plate 408 to move synchronously. That is, when the starting motor 201 drives the baffle A209 and baffle B211 to flip downward, the support plate 408 moves downward. When the baffle A209 and baffle B211 flip upward, the support plate 408 moves upward. The tops of the three always remain on the same horizontal line to support the steel plate.

[0027] like Figure 7As shown, two sets of limiting components are symmetrically distributed on both sides of the adjusting block 409. When not affected by external force, the spring 502, due to its own elasticity, drives the locking blocks 504 in both sets of limiting components to engage with the locking slots 411 on both sides, fixing the position of the adjusting block 409. When it is necessary to move the adjusting block 409, both sets of pull rods 503 can be pulled outwards simultaneously, causing the locking blocks 504 to move inwards along the inner wall of the fixing block 501, disengaging from the locking slots 411, thus releasing the limiting position of the adjusting block 409 and allowing it to move freely. 409 moves laterally to support steel plates of different sizes; when the adjusting block 409 moves to the appropriate position, the spring 502 causes the locking block 504 to pop out due to its elasticity and engage with a set of corresponding locking slots 411, thus limiting and fixing the adjusting block 409; the rotating rod 401 is a telescopic rod, and its movable end can only move laterally and cannot rotate inside the fixed end. During the movement of the adjusting block 409, the movable end of the rotating rod 401 moves outward or inward without affecting the drive of the motor 201 to the threaded rod B405.

[0028] Working principle and usage process of this invention: When the bending angle needs to be adjusted, the motor 201 can be started, and its output shaft drives the threaded rod A202 to rotate. Since the moving plate 205 is threadedly connected to the threaded rod A202, and under the guidance of the guide telescopic rod 204, the moving plate 205 can only move in the vertical direction. When the moving plate 205 moves upward, it pushes the baffle A209 and baffle B211 to flip upward through the connecting rod 206. Since the rotating shaft A210 is inside the rotating shaft B212, and their centers are in the same position, the bottom corners of the baffles A209 and B211 are always in contact when they flip, and they are symmetrical. When the moving plate 205 moves upward, the included angle between them decreases. Conversely, when the moving plate 205 moves downward, it drives the baffles A209 and B211 to flip downward, and the included angle between them increases. The bending angle of the steel plate can be changed by adjusting the included angle between the baffles A209 and B211, which is convenient and easy to operate.

[0029] When motor 201 drives threaded rod A202 to rotate, bevel gear A203 fixed on threaded rod A202 rotates accordingly, driving bevel gear B402, which meshes with it, to rotate. Bevel gear B402 drives rotating rod 401 to rotate, and bevel gear C403 on rotating rod 401 further drives bevel gear D404 to rotate, causing threaded rod B405 to rotate synchronously. Since sliding plate 406 is threadedly connected to threaded rod B405, and under the guidance of moving rod 407, when threaded rod B405 rotates, sliding plate 406 will move vertically, thereby driving support plate 408 to move up and down. When baffles A209 and B211 flip downwards, support plate 408 will also move downwards synchronously. When baffles A209 and B211 flip upwards, support plate 408 will move upwards, always keeping the top outer wall of support plate 408 on the same horizontal line as the top of baffles A209 and B211.

[0030] After the angle between baffles A209 and B211 is adjusted, the steel plate to be bent can be placed on baffles A209, B211 and support plate 408. The steel plate is in contact with the top surfaces of the three baffles and is kept horizontal. The hydraulic cylinder inside the housing 1 drives the pressure block 3 to move downward and contact the steel plate, pressing the steel plate down between baffles A209 and B211. The bending operation is completed by the included angle between baffles A209 and B211. The support plate 408 can support one end of the steel plate, eliminating the need for operators to support the steel plate during the bending operation and reducing the workload.

[0031] Under normal circumstances, the elastic force of the spring 502 causes the locking block 504 to engage with the slot 411, thereby fixing the position of the adjusting block 409. When the position of the adjusting block 409 needs to be adjusted, the pull rod 503 is pulled outward to disengage the locking block 504 from the slot 411, releasing the limit. The adjusting block 409 can then be moved laterally. After adjusting to the appropriate position, the spring 502 causes the locking block 504 to re-engage into the corresponding slot 411, thus fixing the adjusting block 409. This allows for adjustment of the position of the support plate 408 to support steel plates of different lengths, providing high adaptability.

[0032] 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.

[0033] 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 self-adjusting hydraulic CNC bending machine for steel structure production, comprising a housing (1), characterized in that: The outer wall of the housing (1) is provided with a pressure block (3), the front outer wall of the housing (1) is provided with a support mechanism (4), and the inner wall of the housing (1) is provided with an adjustment mechanism (2). The adjustment mechanism (2) includes a motor (201), the output shaft of the motor (201) is fixedly connected to a threaded rod A (202), the outer wall of the threaded rod A (202) is fixedly connected to a bevel gear A (203), the bottom inner wall of the housing (1) is fixedly connected to a guide telescopic rod (204), the movable end of the guide telescopic rod (204) is fixedly connected to a moving plate (205), and the top outer wall of the moving plate (205) is fixedly connected to a connecting rod (206). The top outer wall of the connecting rod (206) is hinged with a slider (207), the inner wall of the housing (1) is rotatably connected with a rotating shaft A (210), the outer wall of the rotating shaft A (210) is fixedly connected with a baffle A (209), the inner wall of the housing (1) is rotatably connected with a rotating shaft B (212), the outer wall of the rotating shaft B (212) is fixedly connected with a baffle B (211), and the bottom outer wall of both the baffle A (209) and the baffle B (211) is provided with a sliding groove (208). The support mechanism (4) includes a rotating rod (401), a bevel gear B (402) is fixedly connected to the right outer wall of the rotating rod (401), a bevel gear C (403) is fixedly connected to the left outer wall of the rotating rod (401), a bevel gear D (404) meshes with the outer wall of the bevel gear C (403), a threaded rod B (405) is fixedly connected to the inner wall of the bevel gear D (404), an adjusting block (409) is slidably connected to the inner wall of the front end of the housing (1), a sliding plate (406) is slidably connected to the inner wall of the adjusting block (409), a moving rod (407) is fixedly connected to the top outer wall of the sliding plate (406), a support plate (408) is fixedly connected to the top outer wall of the moving rod (407), a fixing plate (410) is fixedly connected to the bottom outer wall of the adjusting block (409), a slot (411) is provided on the outer wall of the adjusting block (409), and a limit component is provided on the front outer wall of the housing (1). The left outer wall of the rotating rod (401) is rotatably connected to the outer wall of the fixed plate (410), the bevel gear B (402) meshes with the bevel gear A (203), and the top outer wall of the threaded rod B (405) is rotatably connected to the top inner wall of the adjusting block (409).

2. The hydraulic CNC bending machine for steel structure production with self-adjustable bending angle as described in claim 1, characterized in that: The motor (201) is fixedly connected to the inner wall of the bottom end of the housing (1), the outer wall of the top end of the threaded rod A (202) is rotatably connected to the inner wall of the top end of the housing (1), and the moving plate (205) is threadedly connected to the outer wall of the threaded rod A (202).

3. The hydraulic CNC bending machine for steel structure production with self-adjustable bending angle according to claim 1, characterized in that: The slider (207) is slidably connected to the inner wall of the groove (208), and the connecting rod (206) is slidably connected to the inner wall of the housing (1).

4. The hydraulic CNC bending machine for steel structure production with self-adjustable bending angle as described in claim 1, characterized in that: The outer wall of the baffle A (209) is in contact with the outer wall of the baffle B (211), and the inner wall of the rotating shaft A (210) is in contact with the outer wall of the rotating shaft B (212).

5. The hydraulic CNC bending machine for steel structure production with self-adjustable bending angle according to claim 1, characterized in that: The outer wall of the threaded rod B (405) is threadedly connected to the inner wall of the sliding plate (406), and the moving rod (407) passes through and is slidably connected to the inner wall of the adjusting block (409).

6. The hydraulic CNC bending machine for steel structure production with self-adjustable bending angle according to claim 1, characterized in that: The limiting component includes a fixing block (501), the inner wall of the fixing block (501) is elastically connected to a locking block (504) by a spring (502), and the outer wall of the locking block (504) is fixedly connected to a pull rod (503).

7. The hydraulic CNC bending machine for steel structure production with self-adjustable bending angle according to claim 6, characterized in that: The fixing block (501) is fixedly connected to the outer wall of the front end of the housing (1), one end of the spring (502) is fixedly connected to the outer wall of the card block (504), and the other end of the spring (502) is fixedly connected to the inner wall of the fixing block (501).

8. The hydraulic CNC bending machine for steel structure production with self-adjustable bending angle according to claim 7, characterized in that: The outer wall of the card block (504) is slidably connected to the inner wall of the fixing block (501), the card block (504) is engaged with the card slot (411), and the pull rod (503) passes through and is slidably connected to the left inner wall of the fixing block (501).

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