Stable welding tool for bearing retainer

Abstract

The utility model relates to a stable welding tool for a bearing retainer, and effectively solves the problems that the existing tool is inconvenient to carry out roundness correction and welding on bearing retainers with different diameters, and welding dislocation is caused by deviation easily. According to the stable welding tool for the bearing retainer, through the arrangement of the movable plate, the adjusting wheel assembly, the fixed guide wheel mechanism and the movable guide wheel mechanism, roundness correction can be conducted on the bearing retainer, stress generated by the bearing retainer is eliminated, the two ends, needing to be welded, of the bearing retainer can be naturally close to each other, stable welding can be conveniently conducted on the bearing retainer, and welding efficiency is improved. Welding deviation caused by back-and-forth movement of the end during welding is avoided, the product quality of the bearing retainers is guaranteed, the movable plate, the adjusting wheel assembly and the movable guide wheel mechanism can be adjusted, the positions of all the structures can be adjusted according to the diameters of the bearing retainers, roundness correction and welding can be conveniently conducted on the bearing retainers with different diameters, and the production efficiency is improved. And the bearing retainer is more convenient to process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bearing retainer welding frock technical field, concretely relates to a kind of for bearing retainer stable welding frock. BACKGROUND

[0002] Bearing retainer refers to the bearing part that partly wraps all or part of rolling body and moves with it, for isolating rolling body, usually also guide rolling body and keep it in bearing interior, and it is the indispensable element of bearing, in the production and processing process of bearing retainer, usually need to use welding device to carry out welding processing.

[0003] At present, when large bearing retainer is welded, the two ends of the bearing retainer are usually welded first and then reshaped and rounded, which can easily cause the welding joint of the bearing retainer to break, affecting the product quality, and because the specifications of the bearing retainer are different, the diameters are different, the bearing retainer is in a long strip flat state before welding and rounding, therefore, if it is directly bent and welded, the welding end will produce a large deformation stress, which can easily cause deviation of the welding part and lead to misplacement, so that the bearing retainer cannot be stably welded, affecting the firmness of welding, and because the bearing retainer has various specifications, the existing frock is not convenient for rounding and welding of bearing retainers with different diameters, which is not conducive to the use in processing bearing retainers. SUMMARY

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a stable welding frock for bearing retainer, which can stably weld the bearing retainer, avoid deviation of welding caused by end-to-end movement during welding, ensure the product quality of the bearing retainer, and the movable plate, adjusting wheel assembly and movable guide wheel mechanism can be adjusted, so that the positions of various structures can be adjusted according to the diameter of the bearing retainer, and the bearing retainers with different diameters can be conveniently rounded and welded.

[0005] A stable welding frock for bearing retainer, comprising an operating table, a movable plate and a driving wheel structure, the driving wheel structure is arranged on one side of the upper surface of the operating table, a sliding frame is slidably connected to the side of the upper surface of the operating table near the driving wheel structure, and an adjustable adjusting wheel assembly is arranged on the top of the sliding frame, the movable plate is arranged on the side of the operating table and can slide in the interior thereof, an electric push rod for controlling the movable plate is fixedly installed on the lower surface of the operating table, a fixed guide wheel mechanism and a movable guide wheel mechanism are arranged on the side of the upper surface of the movable plate away from the operating table, and the two mechanisms are horizontally corresponding and arranged at the two ends of the side of the upper surface of the movable plate away from the operating table.

[0006] Preferably, the operating table upper surface is provided with a sliding groove near one side of the sliding frame bottom, the sliding frame bottom is slidingly connected in the sliding groove and can move horizontally in the sliding groove, a fixed sliding block is fixedly connected to the middle of the side of the sliding frame bottom away from the drive wheel structure, a locking rotating rod is threadedly provided on the upper surface of the fixed sliding block, the operating table upper surface is provided with a clamping groove corresponding to the fixed sliding block, and the fixed sliding block is slidingly connected in the clamping groove, and the end of the locking rotating rod penetrating through the bottom of the fixed sliding block can abut against the inner bottom wall of the clamping groove.

[0007] Preferably, the drive wheel structure comprises a drive motor and a drive wheel, the drive motor is fixedly installed on the lower surface of the operating table near the sliding frame, and the output shaft penetrates the upper surface of the operating table, the drive wheel is arranged on the upper surface of the operating table and is connected to the output shaft of the drive motor through a spline, and the drive wheel horizontally corresponds to the adjusting wheel assembly.

[0008] Preferably, the adjusting wheel assembly comprises a fixed frame, a movable frame, an adjusting wheel, a rack and a straight gear rotating rod, the fixed frame is fixedly connected to the top of the sliding frame, movable frames are slidingly connected to the both sides of the outer part of the fixed frame, and adjusting wheels are rotatably connected to the interiors of the two movable frames, and the two adjusting wheels are arranged at the both ends of the interior of the fixed frame and horizontally correspond to the drive wheel.

[0009] Preferably, racks are fixedly connected to the sides of the two movable frames away from the fixed frame, a fixed box is fixedly connected to the middle of the side of the fixed frame away from the adjusting wheel, and the two racks are engaged on the top and bottom of the straight gear rotating rod, and the straight gear rotating rod is rotatably connected to the middle of the interior of the fixed box, and the two racks penetrate the two sides of the fixed box.

[0010] Preferably, the fixed rod body of the electric push rod is fixedly installed on the lower surface of the operating table, and the end of the movable rod body is fixedly connected to the lower surface of the movable plate, the number of the movable plates is three, the three movable plates are arranged at right angles to each other and penetrate the side surface of the operating table, and the lower surface of each movable plate is provided with an electric push rod.

[0011] Preferably, the fixed guide wheel mechanism comprises a fixed guide wheel frame and first guide wheels, the fixed guide wheel frame is fixedly connected to one end of the upper surface of the movable plate away from the operating table, and the number of the first guide wheels is two, and the two first guide wheels are rotatably connected in the interior of the fixed guide wheel frame.

[0012] Preferably, the movable guide wheel mechanism comprises a movable guide wheel frame, two second guide wheels, a screw block and an adjusting screw, the two second guide wheels are both rotationally connected inside the movable guide wheel frame and horizontally correspond to the two first guide wheels in the fixed guide wheel mechanism, the screw block is fixedly connected to the bottom end of the movable guide wheel frame and is drivingly connected to the outside of the adjusting screw.

[0013] Preferably, a limiting groove is formed in the part of the upper surface of the movable plate corresponding to the movable guide wheel mechanism, the screw block is slidingly connected inside the limiting groove and is arranged below the movable plate at the bottom end, and the adjusting screw is rotationally connected below the movable plate and is drivingly connected inside the screw block.

[0014] The above technical scheme has the advantages of:

[0015] The stable welding tool for bearing retainer is provided with the movable plate, the adjusting wheel assembly, the fixed guide wheel mechanism and the movable guide wheel mechanism, the bearing retainer in a flat state is first placed between the adjusting wheel assembly and the driving wheel structure, the bearing retainer is moved by the driving wheel structure, so that the bearing retainer can be bent to an arc state, then the bearing retainer is sequentially passed through the fixed guide wheel mechanism and the movable guide wheel mechanism and reenters between the adjusting wheel assembly and the driving wheel structure, the bearing retainer can be circularly calibrated to eliminate the stress generated by itself, so that the two ends to be welded can naturally approach each other, then the part to be welded is adjusted to be between the fixed guide wheel mechanism and the movable guide wheel mechanism, the bearing retainer can be fixed in position, so that the bearing retainer can be stably welded, the deviation of welding caused by the back-and-forth movement of the end part during welding is avoided, the product quality of the bearing retainer is ensured, and the movable plate, the adjusting wheel assembly and the movable guide wheel mechanism can be adjusted, so that the positions of the structures can be adjusted according to the diameter of the bearing retainer, the bearing retainer with different diameters can be circularly calibrated and welded, and the bearing retainer is more convenient to process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of the utility model;

[0017] Figure 2 It is a workbench and movable plate schematic view of the utility model;

[0018] Figure 3 It is a movable plate, electric push rod and driving wheel structure disassembled state schematic view of the utility model;

[0019] Figure 4 It is a sliding frame and adjusting wheel assembly schematic view of the utility model;

[0020] Figure 5 It is a disassembled state schematic view of the utility model Figure 4 ;

[0021] Figure 6 This is a schematic diagram of the movable guide wheel mechanism of this utility model;

[0022] Figure 7 This is a schematic diagram of the fixed guide wheel mechanism of this utility model.

[0023] In the diagram: 1. Control panel; 2. Movable plate; 3. Sliding frame; 4. Electric push rod; 5. Slide groove; 6. Fixed slider; 7. Locking rod; 8. Slot; 9. Drive motor; 10. Drive wheel; 11. Fixed frame; 12. Movable frame; 13. Adjusting wheel; 14. Rack; 15. Spur gear rod; 16. Fixed box; 17. Fixed guide wheel frame; 18. First guide wheel; 19. Movable guide wheel frame; 20. Second guide wheel; 21. Lead screw slider; 22. Adjusting lead screw; 23. Limit groove. Detailed Implementation

[0024] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figures 1 to 7 The embodiments are described in detail below.

[0025] This embodiment provides a stable welding fixture for bearing cages, as shown in the attached figure. Figures 1-7 As shown, the system includes an operating platform 1, a movable plate 2, and a drive wheel structure. The drive wheel structure is located on one side of the upper surface of the operating platform 1. The drive wheel structure includes a drive motor 9 and a drive wheel 10. The drive motor 9 is fixedly installed on the lower surface of the operating platform 1 near the sliding frame 3, and its output shaft passes through the upper surface of the operating platform 1. The drive wheel 10 is located on the upper surface of the operating platform 1 and is connected to the output shaft of the drive motor 9 via a spline. The drive wheel 10 is horizontally aligned with the adjusting wheel assembly. After the drive motor 9 drives the drive wheel 10 to rotate, it can drive the bearing cage, which is clamped between the drive wheel 10 and the adjusting wheel assembly, forward and bend it into a certain arc.

[0026] A sliding frame 3 is slidably connected to the upper surface of the operating table 1 near the drive wheel structure. A groove 5 is provided on the upper surface of the operating table 1 near the bottom of the sliding frame 3. The bottom of the sliding frame 3 is slidably connected inside the groove 5 and can move laterally within it, allowing adjustment of the distance between the sliding frame 3, its top adjusting wheel assembly, and the drive wheel 10. A fixed slider 6 is fixedly connected to the middle of the bottom of the sliding frame 3 away from the drive wheel structure. A locking rod 7 is threaded through the upper surface of the fixed slider 6. A part on the upper surface of the operating table 1 corresponding to the fixed slider 6 is provided to fit the fixed slider 6. The slot 8 has a fixed slider 6 slidably connected inside it, and the locking rod 7 passes through one end of the bottom of the fixed slider 6 and can abut against the inner bottom wall of the slot 8. By rotating the locking rod 7, the bottom end of the locking rod 7 can be abutted or released against the inner bottom wall of the slot 8. When the bottom end of the locking rod 7 is separated from the inner bottom wall of the slot 8, the sliding frame 3 can slide laterally, which is convenient for adjusting the distance between the adjusting wheel assembly and the drive wheel 10. When the bottom end of the locking rod 7 is abutted against the inner bottom wall of the slot 8, the position of the sliding frame 3 can be fixed, thereby fixing the position of the adjusting wheel assembly.

[0027] An adjustable wheel assembly is provided on the top of the sliding frame 3. The adjustable wheel assembly includes a fixed frame 11, a movable frame 12, an adjusting wheel 13, a rack 14, and a spur gear rod 15. The fixed frame 11 is fixedly connected to the top of the sliding frame 3. Movable frames 12 are slidably connected to both sides of the fixed frame 11, and adjusting wheels 13 are rotatably connected inside each of the two movable frames 12. The two adjusting wheels 13 are respectively located at both ends inside the fixed frame 11 and are horizontally corresponding to the drive wheel 10. A rack 14 is fixedly connected to the side of each movable frame 12 away from the fixed frame 11. A fixed box 16 is fixedly connected to the middle of the side of the fixed frame 11 away from the adjusting wheel 13. The two racks 14 are respectively meshed on the top of the spur gear rod 15 and... The bottom and spur gear rod 15 are rotatably connected to the middle of the fixed box 16. Two racks 14 are respectively inserted on both sides of the fixed box 16. A positioning rod for limiting and fixing the racks 14 is inserted into the top of the fixed box 16. A tension spring is sleeved on the outside of the positioning rod, and the top of the tension spring is fixedly connected to the positioning rod and the bottom is fixedly connected to the fixed box 16. The upper surface of the rack 14 meshing with the top of the spur gear rod 15 is provided with positioning holes. There are several positioning holes, and several positioning holes are equally spaced on the upper surface of the rack 14. One end of the positioning rod inserted into the fixed box 16 can be inserted into its corresponding positioning hole to fix the rack 14, thereby fixing the position of the adjusting wheels 13 on both sides.

[0028] When it is necessary to adjust the distance between the two adjusting wheels 13, pull up the positioning rod to separate the bottom of the positioning rod from the positioning hole, and then rotate the spur gear rod 15. Under the action of the spur gear rod 15 and the two racks 14, the two adjusting wheels 13 can be moved closer or further apart, thus facilitating the adjustment of the distance between the two adjusting wheels 13. After the distance between the two adjusting wheels 13 is adjusted to the appropriate position, release the positioning rod, and the positioning rod will be inserted into the corresponding positioning hole under the action of the tension spring, fixing the position of the racks 14 and the two adjusting wheels 13. By rotating the spur gear rod 15, the two racks 14 can be moved closer or further apart, thus driving the movable frames 12 on both sides and the adjusting wheels 13 to move relative to each other, facilitating the adjustment of the distance between the adjusting wheels 13. The distance between the adjusting wheels 13 affects the bending degree of the bearing cage passing through the adjusting wheels 13 and the drive wheel 10.

[0029] When the distance between the two adjusting wheels 13 is greater and they are closer to the drive wheel 10, the rotation of the drive wheel 10 causes the bearing cage to move, which can bend the bearing cage between the adjusting wheel 13 and the drive wheel 10 by a larger arc. When the distance between the two adjusting wheels 13 is smaller and the distance between the adjusting wheel 13 and the drive wheel 10 is greater, the arc generated when the bearing cage is moved is smaller. By adjusting the distance between the two adjusting wheels 13 and the distance between the adjusting wheel 13 and the drive wheel 10, the arc of the bearing cage can be adjusted, which is convenient for rounding bearing cages of different diameters.

[0030] The movable plate 2 passes through the side of the operating table 1 and can slide inside it. An electric push rod 4 for controlling the movable plate 2 is fixedly installed on the lower surface of the operating table 1. The electric push rod 4 and the drive motor 9 are both connected to an external control unit and are electrically connected to an external circuit through wires. The fixed rod part of the electric push rod 4 is fixedly installed on the lower surface of the operating table 1, and the end of the movable rod is fixedly connected to the lower surface of the movable plate 2. There are three movable plates 2, which are arranged at right angles to each other and all pass through the side of the operating table 1. The lower surface of each movable plate 2 is provided with an electric push rod 4. The extension distance of the movable plate 2 can be adjusted by the electric push rod 4, which facilitates the adjustment of the position of the fixed guide wheel mechanism and the movable guide wheel mechanism on each movable plate 2, thereby adjusting the position of each fixed guide wheel mechanism and the movable guide wheel mechanism according to the diameter of the bearing cage to be calibrated.

[0031] A fixed guide wheel mechanism and a movable guide wheel mechanism are provided on the side of the upper surface of the movable plate 2 away from the operating table 1. The fixed guide wheel mechanism and the movable guide wheel mechanism are respectively located at both ends of the side of the upper surface of the movable plate 2 away from the operating table 1 and are horizontally corresponding. The fixed guide wheel mechanism includes a fixed guide wheel frame 17 and a first guide wheel 18. The fixed guide wheel frame 17 is fixedly connected to one end of the upper surface of the movable plate 2 away from the operating table 1. There are two first guide wheels 18, and both first guide wheels 18 are rotatably connected inside the fixed guide wheel frame 17. The end of the bearing retainer that passes between the drive wheel 10 and the adjusting wheel 13 then passes between the two adjacent first guide wheels 18 and into the movable guide wheel mechanism.

[0032] The movable guide wheel mechanism includes a movable guide wheel frame 19, second guide wheels 20, a lead screw and slider 21, and an adjusting lead screw 22. There are two second guide wheels 20, both rotatably connected inside the movable guide wheel frame 19 and horizontally corresponding to the two first guide wheels 18 in the fixed guide wheel mechanism. The lead screw and slider 21 is fixedly connected to the bottom end of the movable guide wheel frame 19 and is driven by the lead screw and slider 22. A limit groove 23 is formed on the upper surface of the movable plate 2 at a location corresponding to the movable guide wheel mechanism. The lead screw and slider 21 is slidably connected inside the limit groove 23, with its bottom end positioned below the movable plate 2. The limit groove 23 can activate and limit the movement of the lead screw and slider 21, allowing it to move laterally only within the limit groove 23. The adjusting lead screw 22 is rotatably connected to the bottom of the movable plate 2 and is driven by the lead screw and slider 22. Inside the lead screw slider 21, a right-angle handle is fixedly connected to the end of the adjusting lead screw 22. By rotating the right-angle handle, the adjusting lead screw 22 can drive the lead screw slider 21 to slide laterally, thereby adjusting the relative position of the movable guide wheel mechanism and the fixed guide wheel mechanism. This facilitates the adjustment of the movable guide wheel mechanism to a suitable position according to the curvature of the bearing cage inserted into the fixed guide wheel mechanism. Through the guiding action of multiple fixed guide wheel mechanisms and movable guide wheel mechanisms, the bearing cage can be calibrated into a regular annular shape. At the same time, the two ends to be welded can be rotated between the fixed guide wheel mechanism and the movable guide wheel mechanism, which can limit and fix the two ends, facilitate stable welding of the connection part of the bearing cage, and effectively avoid deviation and misalignment of the welded part.

[0033] In summary, the steps for using this stable welding fixture for bearing cages are as follows:

[0034] 1. Adjust each electric push rod 4 according to the size of the bearing cage so that the fixed guide wheel mechanism and the movable guide wheel mechanism on the three movable plates 2 can form a ring shape suitable for the bearing cage to be welded with the adjusting wheel assembly;

[0035] 2. Pass one end of the unbent bearing cage through the space between the adjusting wheel 13 and the drive wheel 10. By adjusting the distance between the two adjusting wheels 13 and the distance between the two adjusting wheels 13 and the drive wheel 10, the curvature of the bearing cage can be adjusted so that after passing through the space between the adjusting wheel 13 and the drive wheel 10, the bearing cage can smoothly pass between the two first guide wheels 18 that are close to it.

[0036] 3. By adjusting the relative positions of the movable guide wheel mechanism and the fixed guide wheel mechanism, the curvature of the part of the bearing cage that passes through the fixed guide wheel mechanism and the movable guide wheel mechanism can be adjusted, so that the part that passes through the two second guide wheels 20 can smoothly enter the next set of fixed guide wheel mechanisms. Driven by the drive wheel 10, the bearing cage can be easily and quickly rounded, and the bearing cage can be calibrated to a state that can be welded.

[0037] 4. After the long, flat bearing cage is rounded, the two ends will approach each other and form a regular circle. The part of the bearing cage that needs to be welded is rotated between one of the fixed guide wheel mechanisms and the movable guide wheel mechanism by the drive wheel 10. The fixed guide wheel mechanism and the movable guide wheel mechanism can fix the state of the welding part of the bearing cage. Finally, the bearing cage is welded through the gap between the fixed guide wheel mechanism and the movable guide wheel mechanism.

[0038] The above description is only for illustrating the present utility model. It should be understood that the present utility model is not limited to the above embodiments, and various modifications that conform to the concept of the present utility model are within the protection scope of the present utility model.

Claims

1. A stabilizing welding fixture for a bearing cage, comprising an operating table (1), a movable plate (2), and a drive wheel structure, characterized in that: The drive wheel structure is located on one side of the upper surface of the operating table (1). A sliding frame (3) is slidably connected to the side of the upper surface of the operating table (1) near the drive wheel structure, and an adjustable adjustment wheel assembly is provided on the top of the sliding frame (3). The movable plate (2) passes through the side of the operating table (1) and can slide inside it. An electric push rod (4) for controlling the movable plate (2) is fixedly installed on the lower surface of the operating table (1). A fixed guide wheel mechanism and a movable guide wheel mechanism are provided on the side of the upper surface of the movable plate (2) away from the operating table (1). The fixed guide wheel mechanism and the movable guide wheel mechanism are respectively located at both ends of the side of the upper surface of the movable plate (2) away from the operating table (1) and are horizontally corresponding.

2. The stabilizing welding fixture for a bearing cage according to claim 1, characterized in that: A groove (5) is provided on the upper surface of the operating table (1) near the bottom of the sliding frame (3). The bottom of the sliding frame (3) is slidably connected to the inside of the groove (5) and can move laterally inside it. A fixed slider (6) is fixedly connected to the middle of the side of the bottom of the sliding frame (3) away from the drive wheel structure. A locking rod (7) is threaded through the upper surface of the fixed slider (6). A slot (8) that matches the fixed slider (6) is provided on the upper surface of the operating table (1) at the part corresponding to the fixed slider (6). The fixed slider (6) is slidably connected to the inside of the slot (8), and the locking rod (7) passes through one end of the bottom of the fixed slider (6) and can abut against the inner bottom wall of the slot (8).

3. The stabilizing welding fixture for a bearing cage according to claim 1, characterized in that: The drive wheel structure includes a drive motor (9) and a drive wheel (10). The drive motor (9) is fixedly installed on the lower surface of the operating table (1) near the sliding frame (3) and its output shaft passes through the upper surface of the operating table (1). The drive wheel (10) is set on the upper surface of the operating table (1) and is connected to the output shaft of the drive motor (9) by a spline. The drive wheel (10) is horizontally corresponding to the adjustment wheel assembly.

4. A stabilizing welding fixture for a bearing cage according to claim 3, characterized in that: The adjusting wheel assembly includes a fixed frame (11), a movable frame (12), an adjusting wheel (13), a rack (14), and a spur gear rod (15). The fixed frame (11) is fixedly connected to the top of the sliding frame (3). Movable frames (12) are slidably connected to both sides of the fixed frame (11), and adjusting wheels (13) are rotatably connected inside the two movable frames (12). The two adjusting wheels (13) are respectively set at both ends inside the fixed frame (11) and are horizontally corresponding to the drive wheel (10).

5. A stabilizing welding fixture for a bearing cage according to claim 4, characterized in that: Both movable frames (12) are fixedly connected to racks (14) on the side away from the fixed frame (11). The fixed frame (11) is fixedly connected to a fixed box (16) in the middle on the side away from the adjusting wheel (13). The two racks (14) are respectively meshed on the top and bottom of the spur gear rod (15) and the spur gear rod (15) is rotatably connected to the middle of the fixed box (16). The two racks (14) are respectively inserted on both sides of the fixed box (16).

6. A stabilizing welding fixture for a bearing cage according to claim 1, characterized in that: The fixed rod part of the electric push rod (4) is fixedly installed on the lower surface of the operating table (1), and the end of the movable rod is fixedly connected to the lower surface of the movable plate (2). There are three movable plates (2), and the three movable plates (2) are arranged at right angles to each other and are all installed on the side of the operating table (1). Each movable plate (2) has an electric push rod (4) on its lower surface.

7. A stabilizing welding fixture for a bearing cage according to claim 1, characterized in that: The fixed guide wheel mechanism includes a fixed guide wheel frame (17) and a first guide wheel (18). The fixed guide wheel frame (17) is fixedly connected to one end of the upper surface of the movable plate (2) away from the operating table (1). There are two first guide wheels (18), and both first guide wheels (18) are rotatably connected inside the fixed guide wheel frame (17).

8. A stabilizing welding fixture for a bearing cage according to claim 7, characterized in that: The movable guide wheel mechanism includes a movable guide wheel frame (19), a second guide wheel (20), a lead screw slider (21), and an adjusting lead screw (22). There are two second guide wheels (20), both of which are rotatably connected inside the movable guide wheel frame (19) and are horizontally corresponding to the two first guide wheels (18) in the fixed guide wheel mechanism. The lead screw slider (21) is fixedly connected to the bottom end of the movable guide wheel frame (19) and is drivenly connected to the outside of the adjusting lead screw (22).

9. A stabilizing welding fixture for a bearing cage according to claim 8, characterized in that: A limiting groove (23) is provided on the upper surface of the movable plate (2) at the part corresponding to the movable guide wheel mechanism. The lead screw slider (21) is slidably connected inside the limiting groove (23) and its bottom end is set below the movable plate (2). The adjusting lead screw (22) is rotatably connected below the movable plate (2) and is drivenly connected inside the lead screw slider (21).

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