Steel plate welding equipment

Abstract

The utility model belongs to the field of steel processing technical equipment, and particularly discloses steel plate welding equipment which comprises a workbench, a welding unit, a mounting frame, a conveying unit and a first driving part, and the welding unit is mounted in the middle of the workbench; the mounting frames are mounted on the two sides, in the front-back direction, of the workbench. The conveying unit comprises a driving roller, a driven roller and a power source, the driving roller is installed on the installation frame, the power source is used for driving the driving roller to rotate on the installation frame, the driven roller is rotatably installed on the workbench, the driving roller is located above the driven roller, and the driving roller is located above the driven roller. A transmission gap is formed between the driving roller and the driven roller and extends in the front-back direction. The first driving part is used for driving the mounting frame to move and be positioned in the up-down direction in the direction of entering and exiting the transmission gap. According to the steel plate welding equipment, the steel plate can be driven to stably move on the working platform, and the slipping phenomenon is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steel processing technology and equipment, and in particular to a steel plate welding equipment. Background Technology

[0002] Welding equipment refers to the equipment required to perform welding processes, mainly including welding machines, welding process equipment, and welding auxiliary tools. Welding equipment plays a vital role in industrial production, and its stability and reliability directly affect welding quality and production efficiency.

[0003] When welding steel plates, the two steel plates to be welded are first placed on the work platform and then transported to the welding head of the welding equipment by conveyor rollers, so that the two steel plates come into contact with each other. Then the welding head moves along the joint trajectory of the two plates to weld. However, in existing steel plate welding equipment, the steel plates may slip on the conveyor rollers due to their own weight, making it difficult to move and affecting the normal movement of the welding equipment. Therefore, there is an urgent need for a steel plate welding equipment that can drive the steel plates to move stably on the work platform. Utility Model Content

[0004] The purpose of this utility model is to provide a steel plate welding equipment to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The solution to the technical problem of this utility model is:

[0006] Steel plate welding equipment, including:

[0007] Workbench:

[0008] A welding unit is installed in the middle of the workbench;

[0009] Mounting brackets are installed on both sides of the workbench along the front-to-back direction;

[0010] The conveying unit includes a drive roller, a driven roller, and a power source. The drive roller is mounted on the mounting frame, and the power source drives the drive roller to rotate on the mounting frame. The driven roller is rotatably mounted on the worktable. The drive roller is located above the driven roller, and a transmission gap is formed between the drive roller and the driven roller, which extends in the front-back direction.

[0011] A first driving member is used to drive the mounting bracket to move and position itself in the vertical direction along the direction of entering and exiting the transmission gap.

[0012] This technical solution has at least the following beneficial effects: After the steel plate to be welded is placed in the transmission gap, the first driving component is activated, causing the entire mounting frame to move downwards, which in turn causes the active roller mounted on the mounting frame to move closer to the driven roller, narrowing the transmission gap until the active roller and driven roller clamp the steel plate. By increasing the pressure, the rolling friction between the steel plate and the conveying assembly is increased, allowing the steel plate to move smoothly within the transmission gap to the welding unit located in the middle of the worktable, reducing the phenomenon of the steel plate slipping on each roller, and reducing downtime caused by conveying stagnation.

[0013] As a further improvement to the above technical solution, the driving roller and the driven roller of the same conveying unit are arranged in a centered manner. After the driving roller and the driven roller are arranged in a centered manner, the projections of the driving roller and the driven roller overlap on the same plane, and the driving roller and the driven roller can stably clamp the steel plate, making the conveying process smoother.

[0014] As a further improvement to the above technical solution, the mounting frame is provided with tenons, and the worktable has mortises extending in the vertical direction. The tenons are slidably installed in the mortises. Through the tenons and mortises, the mounting frame can slide stably in the vertical direction, reducing the risk of the mounting frame detaching from the worktable and improving the safety factor during equipment use.

[0015] As a further improvement to the above technical solution, the mounting frame is provided with multiple conveying units spaced apart along the front-to-back direction. Multiple driving and driven rollers clamp the steel plate, improving the stability of the steel plate's movement on the worktable.

[0016] As a further improvement to the above technical solution, the first driving component includes a driving cylinder, which is mounted on the worktable, and its output end is connected to the mounting frame. The driving cylinder enables precise and stable movement of the mounting frame on the worktable, reducing the likelihood of insufficient movement leading to inadequate clamping of the steel plate or excessive movement causing collision between the drive roller and the steel plate, resulting in damage.

[0017] As a further improvement to the above technical solution, the worktable is provided with guide members on one side in the left and right directions. Each guide member has an abutment end that can move in the left and right directions along the direction of entering and exiting the transmission gap. A baffle is provided on the other side of the worktable. After long-distance transport on the worktable, the steel plates may shift, causing misalignment of the steel plates on the mounting brackets on both sides, resulting in welding misalignment. This solution addresses this by activating the guide members after the steel plates are placed in the transmission gap, causing the abutment ends to move towards the direction closer to the transmission gap. This pushes the steel plates placed in the transmission gap in the left and right directions, moving them towards the baffle. When all the steel plates on each mounting bracket are pushed to the baffle position, the two steel plates to be welded are aligned, facilitating welding by the welding unit.

[0018] As a further improvement to the above technical solution, the guide component includes a guide rod and a second driving component. A transverse groove extending in the left-right direction is provided on the worktable. One end of the guide rod is installed in the transverse groove, and the other end extends upwards. The abutting end is the upward-facing end of the guide rod. The second driving component is installed on the worktable and is used to drive the guide rod to move in the left-right direction along the direction of entering and exiting the transmission gap. Through the transverse groove and the guide rod, stable pushing of the steel plate is achieved, ensuring that the steel plate and the driven roller at the bottom are centered. The center of gravity of the steel plate is located at the center of the driven roller, allowing the driven roller to stably support the steel plate and reducing the possibility of the steel plate falling or shifting within the conveying space, further improving the transmission stability of the steel plate on the welding equipment.

[0019] As a further improvement to the above technical solution, multiple guide members are arranged at intervals on the worktable, and the multiple guide members and the driven roller are alternately arranged on the worktable in the front-to-back direction. This design reduces the obstruction of the driven roller to the guide rod, increases the lateral movement distance of the guide rod, and thus enables the guide rod to guide and center steel plates with smaller widths, improving the adaptability of the entire welding equipment to operate on steel plates of different sizes.

[0020] As a further improvement to the above technical solution, the second driving component includes an elastic element. One end of the elastic element is installed on the side of the transverse groove near the transmission gap, and the other end is connected to the side of the guide rod near the transmission gap. When the steel plate is moved into the transmission gap, the elastic element automatically drives the guide rod to move towards the baffle, reducing the cost of setting up the driving component and lowering the overall cost of the equipment.

[0021] As a further improvement to the above technical solution, the inner wall of the tenon groove is connected to a connecting groove extending in the vertical direction. A connecting rod is slidably installed in the connecting groove. A first magnetic element is provided on the connecting rod, and a second magnetic element is provided on the tenon block. A locking rod is provided on the side of the guide rod away from the transmission gap. The locking rod is located in the transverse groove. Multiple locking grooves are arranged at intervals in the left-right direction on the locking rod. A guide surface is provided at the downward end of the connecting rod. The connecting rod can slide to be inserted into one of the locking grooves. With the above technical solution, after the guide rod completes its guiding function, the steel plate is aligned. Then, the mounting frame begins to fall to the upper surface of the steel plate. When the second magnetic component on the tenon passes the first magnetic component, the attraction between the two causes the tenon to move the connecting rod downwards until the lower end of the connecting rod inserts into the locking groove, locking the entire guide rod in the transverse groove to prevent the steel plate from moving. When the mounting frame moves upwards, the first magnetic component is located on the moving path of the second magnetic component. When the second magnetic component passes the first magnetic component, it drives the connecting rod upwards, and the lower end of the connecting rod is no longer inserted into the locking groove, thus unlocking the guide rod. This solution achieves automatic locking and unlocking of the guide rod through the linkage of the downward-moving mounting frame and the connecting rod, reducing the workload of workers. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the steel plate welding equipment of this utility model;

[0024] Figure 2 This is a cross-sectional view of the steel plate welding equipment of this utility model from a left-right perspective.

[0025] Figure 3 This is a first sectional view of the steel plate welding equipment of this utility model from the perspective of the front-to-back direction;

[0026] Figure 4 This is a second sectional view of the steel plate welding equipment of this utility model from the perspective of the front-to-back direction.

[0027] Figure Labels

[0028] 1. Workbench; 11. Transverse chute; 2. Welding unit; 3. Mounting frame; 311. Second magnetic component; 4. Conveying unit; 41. Drive roller; 42. Driven roller; 43. Power source; 44. Transmission gap; 5. First driving component; 6. Guide rod; 61. Locking rod; 611. Locking groove; 7. Baffle; 8. Elastic component; 9. Connecting rod; 91. First magnetic component. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] During the welding process of steel bars using welding equipment, workers place the steel plates on the conveyor rollers on both sides of the workbench 1 for conveying. However, since the existing welding equipment only has one row of conveyor rollers at the bottom, the steel plates are prone to slipping under their own weight when moving and cannot be moved to the welding head of the welding equipment. Manual adjustment is required, which affects the progress of the welding operation. Therefore, there is an urgent need for a steel plate welding equipment that can drive the steel plates to move stably on the workbench 1.

[0034] Reference Figure 1 and Figure 2 This application provides a steel plate welding device, which includes:

[0035] Workbench 1;

[0036] Welding unit 2 is installed in the middle of workbench 1. Welding unit 2 includes welding frame and welding head. The welding head can move on the welding frame in the left and right direction to splice two steel plates.

[0037] Mounting bracket 3, the workbench 1 is provided with mounting bracket 3 on both sides along the front and back direction, and the welding unit 2 is located between the two mounting brackets 3;

[0038] The conveying unit 4 includes a drive roller 41, a driven roller 42, and a power source 43. The drive roller 41 is mounted on the mounting frame 3, and the power source 43 is used to drive the drive roller 41 to rotate on the mounting frame 3. The driven roller 42 is rotatably mounted on the worktable 1. The drive roller 41 is located above the driven roller 42. The rotation axes of the drive roller 41 and the driven roller 42 both extend in the left-right direction. A transmission gap 44 is formed between the drive roller 41 and the driven roller 42. The transmission gap 44 extends in the front-back direction. In this embodiment, the mounting frame 3 is provided with multiple conveying units 4 at intervals in the front-back direction.

[0039] The first driving component 5 is installed on the workbench 1. The first driving component 5 and the mounting bracket 3 correspond one-to-one. The first driving component 5 is used to drive the corresponding mounting bracket 3 to move in the up and down direction on the workbench 1.

[0040] After the steel plate to be welded is placed into the transmission gap 44, the first drive component 5 is activated, causing the mounting frame 3 to move downward as a whole, which in turn causes the drive roller 41 mounted on the mounting frame 3 to move towards the driven roller 42, narrowing the transmission gap 44 until the drive roller 41 and the driven roller 42 clamp the steel plate.

[0041] By increasing the pressure, the rolling friction between the steel plate and the conveying unit 4 is increased, preventing the steel plate from slipping on the rollers and ensuring that the steel plate can move smoothly in the transmission gap 44 in the front-to-back direction. This ensures a stable and orderly conveying process and lays a good foundation for the smooth progress of subsequent welding processes. At the same time, since there are no additional frictional changes or obstacles caused by clamping deviations, the steel plate can move smoothly along the predetermined conveying direction, reducing the occurrence of jams, stagnation, and other phenomena that affect the continuity of conveying. This further improves the smoothness of the entire conveying process from the placement of the steel plate to its arrival at the welding unit 2, which helps to improve the efficiency of the overall welding work. Finally, by moving the active roller 41 to change the size of the conveying space, the steel plate welding equipment can adapt to steel plates of different thicknesses, thereby improving the practicality of the steel plate welding equipment.

[0042] In this embodiment, the first driving component 5 includes a driving cylinder, which is mounted on the worktable 1. The output end of the driving cylinder is connected to the mounting frame 3. When the mounting frame 3 needs to be moved, the driving cylinder is directly activated to drive the mounting frame 3 to move on the worktable 1.

[0043] In other embodiments, the first driving component 5 includes a gear and rack module. A motor is provided on the workbench 1, and a rack is fixedly installed on the mounting frame 3. A gear is sleeved on the output end of the motor. The gear and rack mesh with each other. After the motor is started, the rack is driven to move on the workbench 1 through the meshing of the gear and rack, thereby changing the size of the transmission gap 44 and pressing the steel plate for conveying.

[0044] In this embodiment, the power source 43 is a drive motor, which is fixedly mounted on the mounting frame 3. A first pulley is provided on the output end of the drive motor, and a second pulley is sleeved on one of the active rollers 41. A belt is wound around the first pulley and the second pulley. The active roller 41 is driven to rotate by the linkage of the belt. The active roller 41 and the remaining active rollers 41 are connected by a pulley group for transmission, so that only one drive motor is needed to drive all the active rollers 41 in the same mounting frame 3 to rotate.

[0045] As a further preferred embodiment, each mounting frame 3 has multiple tenons arranged at intervals along its two sides in the left-right direction and in the front-back direction. The worktable 1 has multiple tenons extending in the up-down direction. The tenons and tenons correspond one-to-one. The tenons are slidably installed in the corresponding tenons. In this application, the cross-sectional shape of the tenons and tenons is T-shaped. Through the cooperation of the tenons and tenons, unnecessary movement of the mounting frame 3 in other directions (such as horizontal swaying, offset, etc.) can be restricted, so that it can only slide stably in the vertical direction. This ensures the accuracy and stability of the movement trajectory of the mounting frame 3 and helps to better realize the adjustment function of the transmission gap 44 between the active roller 41 and the driven roller 42.

[0046] Further, as a preferred embodiment, refer to Figure 3 The driving roller 41 and driven roller 42 of the same conveying unit 4 are centered and of equal length, which ensures a more uniform and symmetrical pressure distribution on the upper and lower surfaces of the steel plate when clamping it. Compared with misaligned rollers, this avoids the problem of excessive or insufficient local force on the steel plate due to uneven pressure, allowing the steel plate to be clamped more stably and reliably during conveying, and reducing the likelihood of shaking or shifting due to unstable clamping, thus ensuring the stability of the steel plate's posture during conveying.

[0047] After long-distance transportation, steel plates are prone to positional shifts, which can lead to misalignment of the steel plates on the two mounting brackets 3, affecting welding quality. (Refer to...) Figure 3 and Figure 4 The workbench 1 is equipped with guide members on one side in the left and right directions. Each guide member has an abutment end that can move in the left and right directions along the transmission gap 44. A baffle 7 is provided on the other side of the workbench 1. The movement of the abutment end of the guide member in the left and right directions applies a lateral pushing force to the steel plate placed in the transmission gap 44, causing the steel plate to move towards the baffle 7 until it is in contact with it. This achieves precise alignment of the steel plate in the left and right directions. This ensures accurate alignment of the steel plates on each mounting bracket 3, creating favorable conditions for high-quality welding in the welding unit 2. It effectively avoids welding deviations caused by steel plate misalignment, allowing the welding process to proceed accurately according to design requirements. The weld seams are evenly and regularly distributed in the predetermined positions, ensuring key quality indicators such as the connection strength and sealing of the weld points. Welding defects such as inconsistent weld width and weak welds caused by steel plate misalignment will not occur, greatly improving the overall quality of the welded product.

[0048] The guide includes a guide rod 6 and a second drive component. A transverse groove 11 extending in the left-right direction is provided on the worktable 1. One end of the guide rod 6 is installed in the transverse groove 11, and the other end extends upward through the worktable and into the transmission gap 44. The abutting end is the upward end of the guide rod 6. An inclined surface is provided on the side of the guide rod 6 away from the welding unit 2. Through the inclined surface, the steel plate can be directly pushed out of the guide rod during transmission, reducing the amount of manual adjustment of the guide rod position.

[0049] When the steel plate is conveyed, it abuts against the inclined surface. The second drive component is installed on the worktable 1 and is used to drive the guide rod 6 to move in the left and right direction along the inlet and outlet transmission gap 44. The second drive component drives the guide rod 6 to move, thus pushing the steel plate and providing a stable and precise guiding structure for the lateral movement of the steel plate. When the guide rod 6 moves along the transverse groove 11, its movement trajectory is fixed and smooth. Compared to when there is no such guiding structure, it can apply lateral force to the steel plate more stably, avoiding directional deviation or swaying during the pushing process. This achieves a more reliable and smoother pushing operation of the steel plate, ensuring the accuracy and effectiveness of the steel plate position correction.

[0050] Further, as a preferred embodiment, refer to Figure 2 Multiple guide components are arranged at intervals on the worktable 1. The multiple guide components and driven rollers 42 are alternately arranged on the worktable 1 in the front-back direction. Through this scheme, the obstruction of the driven rollers 42 to the guide rods 6 is reduced, and the distance that the guide rods 6 can move in the left and right directions is increased. This allows the guide rods 6 to guide and center steel plates with smaller widths, thereby improving the adaptability of the entire welding equipment to steel plates of different sizes.

[0051] As a further preferred embodiment, the second driving member includes an elastic member 8, one end of which is installed on the side of the transverse groove 11 near the transmission gap 44, and the other end is connected to a section of the guide rod 6 near the transmission gap 44.

[0052] Reference Figure 4 The inner wall of the tenon is connected to a connecting groove extending in the vertical direction. A connecting rod 9 is slidably installed in the connecting groove. A first magnetic element 91 is provided on the connecting rod 9, and a second magnetic element 311 is provided on the tenon. A locking rod 61 is provided on the side of the guide rod 6 away from the transmission gap 44. The locking rod 61 is located in the transverse groove 11. Multiple locking grooves 611 are arranged at intervals in the left and right direction on the locking rod 61. A guide surface is provided at the lower end of the connecting rod 9. The distance from the lower end of the connecting rod 9 near the transmission gap 44 to the upper end is greater than the distance from the side away from the transmission gap 44 to the upper end. The connecting rod 9 can slide to be inserted into one of the locking grooves 611. The length of the moving path of the connecting rod 9 is the depth of the locking groove 611. The minimum moving distance of the mounting bracket 3 is greater than the depth of the locking groove 611.

[0053] After the guide rod 6 completes its guiding function, the steel plate is aligned. Then, the mounting bracket 3 begins to fall to the upper surface of the steel plate. When the second magnetic element 311 on the tenon passes the first magnetic element 91, the attraction between the two causes the tenon to move the connecting rod 9 downward until the lower end of the connecting rod 9 is inserted into the locking groove 611, locking the guide rod 6 in the transverse groove 11 to prevent the steel plate from moving. If the mounting bracket 3 moves to below the first magnetic element 91, the first magnetic element 91 and the second magnetic element 311 will disengage and no longer abut against each other. The mounting bracket 3 can continue to move downward without affecting the connecting rod 9, which is stable in the connecting groove. At the same time, through the action of the guide surface, when the steel plate moves and the locking rod moves towards the baffle through the guide rod, the connecting rod will not obstruct the movement of the locking rod. However, when the locking rod may move in the opposite direction, the side of the guide surface near the baffle will obstruct the locking rod in the locking groove to reduce the movement of the locking rod.

[0054] When the mounting bracket 3 moves upward, the first magnetic component 91 is located on the moving path of the second magnetic component 311. When the second magnetic component 311 passes the first magnetic component 91, the connecting rod 9 moves upward through magnetic attraction. The lower end of the connecting rod 9 is no longer inserted into the locking groove 611, thus unlocking the guide rod 6. This solution achieves automatic locking and unlocking of the guide rod 6 through the linkage of the downward-moving mounting bracket 3 and the connecting rod 9, reducing the workload of workers.

[0055] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. Steel sheet welding apparatus, characterized in that, The utility model relates to a welding device for welding pipe, which comprises: a workbench (1); a welding unit (2) installed in the middle of the workbench (1); mounting frames (3) installed on both sides of the workbench (1) in the front-rear direction; a conveying unit (4) comprising a driving roller (41), a driven roller (42) and a power source (43), wherein the driving roller (41) is installed on the mounting frame (3), the power source (43) is used to drive the driving roller (41) to rotate on the mounting frame (3), the driven roller (42) is rotatably installed on the workbench (1), the driving roller (41) is located above the driven roller (42), a transmission gap (44) is formed between the driving roller (41) and the driven roller (42), and the transmission gap (44) extends in the front-rear direction; a first driving member (5) used to drive the mounting frame (3) to move and position in the up-down direction along the direction of entering and leaving the transmission gap (44).

2. The steel sheet welding apparatus according to claim 1, characterized by The driving roller (41) and the driven roller (42) of the same conveying unit (4) are centrally arranged.

3. The steel sheet welding apparatus according to claim 1, characterized by The mounting frame (3) is provided with a tenon, the workbench (1) is provided with a mortise extending in the up-down direction, and the tenon is slidably installed in the mortise.

4. The steel sheet welding apparatus according to claim 1, characterized by A plurality of the conveying units (4) are arranged on the mounting frame (3) in the front-rear direction.

5. The steel sheet welding apparatus according to claim 1, characterized by The first driving member (5) comprises a driving cylinder, the driving cylinder is installed on the workbench (1), and the output end of the driving cylinder is connected to the mounting frame (3).

6. The steel sheet welding apparatus according to claim 3, characterized by The workbench (1) is provided with a guide member on one side in the left-right direction, the guide member has an abutting end, the abutting end can move in the left-right direction along the direction of entering and leaving the transmission gap (44), and the workbench (1) is provided with a baffle (7) on the other side.

7. The steel sheet welding apparatus according to claim 6, characterized by The guide member comprises a guide rod (6) and a second driving member, the workbench (1) is provided with a transverse slot (11) extending in the left-right direction, one end of the guide rod (6) is installed in the transverse slot (11) and the other end extends upward, the abutting end is the upward end of the guide rod (6), and the second driving member is installed on the workbench (1) and used to drive the guide rod (6) to move in the left-right direction along the direction of entering and leaving the transmission gap (44).

8. The steel sheet welding apparatus according to claim 7, characterized by A plurality of the guide members are arranged on the workbench (1) in the front-rear direction alternately with a plurality of the driven rollers (42).

9. The steel sheet welding apparatus according to claim 7, characterized by The second driving member comprises a resilient member (8), one end of the resilient member (8) is installed on the side of the transverse slot (11) close to the transmission gap (44), and the other end is connected to the side of the guide rod (6) close to the transmission gap (44).

10. The steel sheet welding apparatus according to claim 9, characterized by The inner wall of the mortise is communicated with a connecting groove extending in the up-down direction, a connecting rod (9) is slidably installed in the connecting groove, a first magnetic member (91) is arranged on the connecting rod (9), a second magnetic member (311) is arranged on the tenon, a locking rod (61) is arranged on the side of the guide rod (6) away from the transmission gap (44), the locking rod (61) is located in the transverse moving groove (11), a plurality of locking grooves (611) are arranged on the locking rod (61) in the left-right direction, a guide surface is arranged on the downward end of the connecting rod (9), and the connecting rod (9) can be inserted into one of the locking grooves (611) in a slidable manner.

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