Iron frame bed connecting piece automatic processing device

Abstract

The application discloses an automatic processing device for iron-framed bed connecting pieces, which comprises a base plate, a placing frame is fixed on the top of the base plate, a limiting window is arranged in the top of one end of the placing frame, a side positioning plate is arranged in the placing frame, a connecting rod is rotatably installed on the top of the inner side of a vertical plate, a longitudinal stabilizing window is arranged in the bottom plate, a lower positioning bolt is arranged in the longitudinal stabilizing window, a lower positioning nut is arranged at the bottom end of the lower positioning bolt, and the top end of the lower positioning bolt is connected with the bottom of a drilling mechanism. The automatic processing device for iron-framed bed connecting pieces adopts a novel structure design, can quickly and stably extrude and fix iron-framed bed connecting pieces of different specifications in the vertical direction and the horizontal direction, is convenient for the quick production of iron-framed bed connecting pieces of different specifications, and can adjust the distance of the drilling mechanism according to the specifications of the iron-framed bed connecting pieces, so that bolt mounting holes with different distances and in triangular distribution can be stably drilled.

Description

Technical Field

[0001] This invention relates to the field of iron frame bed production equipment technology, specifically to an automatic processing device for iron frame bed connectors. Background Technology

[0002] Metal bunk beds are a common type of furniture. Their main frame is made of square tubing or C-shaped steel. Metal bunk beds are sturdy and stable. There is no noticeable friction noise or wobbling when the bed is shaken by hand. Adults can also turn over in bed without noticeable friction noise. To facilitate transportation and disassembly, existing metal bunk beds are generally assembled using prefabricated connectors with bolt holes. This not only makes assembly easy but also ensures high stability.

[0003] With the continuous processing of bunk bed connectors, it has been found in actual production operations that existing bunk bed connectors have three pre-set threaded connection holes arranged in a triangular pattern at the end. During processing, it is necessary to measure and mark these points on the end of the connector made of C-shaped steel before drilling each hole individually. This process is not only cumbersome and inconvenient for continuous production, but also results in significant errors between holes due to the individual drilling method, making it impossible to continuously and accurately drill large batches of bunk bed connectors. Therefore, it is necessary to design an automatic processing device for bunk bed connectors to address these problems. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic processing device for iron bed frame connectors, in order to solve the problem mentioned in the background art that when processing iron bed frame connectors, it is necessary to measure and mark the fixed points at the end of the connector made of C-shaped steel in advance, and then use drilling tools to drill holes one by one. This is not only complicated to operate and inconvenient for continuous production, but also the error of drilling holes one by one results in large errors between holes, making it impossible to continuously and accurately drill holes for a large number of iron bed frame connectors.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic processing device for iron frame bed connectors, comprising a base plate, a placement frame fixed to the top of the base plate, a limiting window penetrating through the top of one end of the placement frame, a vertical plate penetrating through the limiting window, a side positioning plate fixed to the bottom of the vertical plate, the side positioning plate being disposed within the placement frame, a connecting rod rotatably mounted on the top of the inner side of the vertical plate, the bottom end of the connecting rod being rotatably connected to the top surface of a middle plate, the middle part of the middle plate fitting against the inner wall of the middle window, the middle window being opened at the top center of the placement frame, a top positioning plate fixed to the bottom of the middle plate, a stabilizing column fixed to the outer side of the placement frame, the stabilizing column fitting against the inner wall of the track window, the track window being opened at one end of a horizontal plate, one side end face of the horizontal plate being connected and fixed to one end of a horizontal hydraulic rod, the horizontal hydraulic rod being connected and fixed to the track window being connected ... The other end of the rod is fixed to the outer wall of the placement frame, and the other end of the horizontal plate is connected and fixed to the mounting frame. A side electric telescopic rod is fixed to the outer side of the mounting frame. The top end of the side electric telescopic rod is connected and fixed to the bottom edge of the top plate. A transverse stabilizing window is opened through one side of the top of the top plate. An upper positioning bolt is installed through the transverse stabilizing window. An upper positioning nut is installed at the top end of the upper positioning bolt. The bottom end of the upper positioning bolt is connected and fixed to the top of the upper drilling mechanism. A lower electric telescopic rod is fixedly installed on the bottom surface of the mounting frame. The bottom end of the lower electric telescopic rod is connected and fixed to the top edge of the bottom plate. A longitudinal stabilizing window is opened through the bottom plate. A lower positioning bolt is installed through the longitudinal stabilizing window. A lower positioning nut is installed at the bottom end of the lower positioning bolt. The top end of the lower positioning bolt is connected and fixed to the bottom of the lower drilling mechanism.

[0006] Preferably, a servo motor is fixed to the top of the placement frame, and a horizontal threaded rod is installed at the output end of the servo motor. The horizontal threaded rod is rotatably installed on the top surface of the substrate through a bearing seat, and the horizontal threaded rod passes through the middle of the vertical plate.

[0007] Preferably, the servo motor, horizontal threaded rod, vertical plate, limiting window, and side positioning plate are all horizontally symmetrically distributed about the center of the placement frame. The horizontal threaded rod and the vertical plate are threadedly connected, and the vertical plate and the limiting window are slidably connected.

[0008] Preferably, the connecting rod is inclined and symmetrically distributed about the center of the middle plate.

[0009] Preferably, the stabilizing columns and the horizontal plate are symmetrically distributed about the center of the placement frame, the side view cross-sectional shape of the stabilizing columns is "T" shaped, and the stabilizing columns are symmetrically distributed about the center of the track window.

[0010] Preferably, the upper positioning bolts are symmetrically distributed about the center of the transverse stabilizing window, and the upper positioning bolts are slidably connected to the transverse stabilizing window.

[0011] Preferably, the upper drilling mechanism is symmetrically distributed about the lower drilling mechanism, the bottom of the drill bit at the bottom of the upper drilling mechanism is at a horizontal plane higher than the bottom of the top positioning plate, and the top of the drill bit at the top of the lower drilling mechanism is at a horizontal plane lower than the bottom of the inner side of the placement frame.

[0012] Preferably, the lower positioning bolt and the longitudinal stabilizing window are slidably connected, the length of the longitudinal stabilizing window is greater than half the length of the base plate, and the center of the longitudinal stabilizing window and the center of the transverse stabilizing window are on the same vertical plane.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the automatic processing device for iron frame bed connectors adopts a novel structural design, which can not only quickly and stably extrude and fix iron frame bed connectors of different specifications in the vertical and horizontal directions, facilitating the rapid production of iron frame bed connectors of different specifications, but also can adjust the spacing of the drilling mechanism according to the specifications of the iron frame bed connectors to stably drill bolt mounting holes with different spacings distributed in a triangular pattern.

[0014] 1. The horizontal threaded rod is rotated by a servo motor, which drives the vertical plate to make a stable horizontal displacement along the limiting window, so as to make stable horizontal extrusion and positioning of the C-shaped steel raw material of the connector. The connecting rod is also driven to rotate, so that the connecting rod pushes the middle plate and the middle window to make stable vertical movement, so as to make stable vertical extrusion and positioning of the C-shaped steel raw material of the connector.

[0015] 2. By working together with the stabilizing column, track window, level plate and horizontal hydraulic rod, the horizontal position of the mounting frame, upper drilling mechanism and lower drilling mechanism can be adjusted over a wide range, so that the distance between the upper drilling mechanism and the lower drilling mechanism and the end of the C-shaped steel of the connecting parts can be easily adjusted, which can adapt to the drilling processing of connecting parts of iron frame beds of different specifications.

[0016] 3. By cooperating with the side electric telescopic rod, top plate, lateral stabilizing window, upper positioning bolt, upper positioning nut, lower electric telescopic rod, bottom plate, longitudinal stabilizing window, lower positioning bolt and lower positioning nut, the spacing of the symmetrically distributed upper drilling mechanism can be easily adjusted, as well as the horizontal spacing between the upper and lower drilling mechanisms, so that the upper and lower drilling mechanisms can stably drill bolt mounting holes with different spacings in a triangular distribution. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the present invention;

[0018] Figure 2 This is a side cross-sectional view of the placement frame and limiting window of the present invention;

[0019] Figure 3 This is a front view cross-sectional structural diagram of the placement rack of the present invention;

[0020] Figure 4 This is a side sectional view of the mounting frame structure of the present invention;

[0021] Figure 5 This is a frontal cross-sectional view of the mounting frame of the present invention;

[0022] Figure 6 This is a top view cross-sectional structural diagram of the mounting frame of the present invention.

[0023] In the diagram: 1. Base plate; 2. Placement rack; 3. Servo motor; 4. Horizontal threaded rod; 5. Vertical plate; 6. Limiting window; 7. Side positioning plate; 8. Connecting rod; 9. Middle plate; 10. Middle window; 11. Top positioning plate; 12. Stabilizing column; 13. Track window; 14. Horizontal plate; 15. Horizontal hydraulic rod; 16. Mounting frame; 17. Side electric telescopic rod; 18. Top plate; 19. Lateral stabilizing window; 20. Upper positioning bolt; 21. Upper positioning nut; 22. Upper drilling mechanism; 23. Lower electric telescopic rod; 24. Base plate; 25. Longitudinal stabilizing window; 26. Lower positioning bolt; 27. Lower positioning nut; 28. Lower drilling mechanism. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-6This invention provides a technical solution: an automatic processing device for iron frame bed connectors, comprising a base plate 1, a placement rack 2, a servo motor 3, a horizontal threaded rod 4, a vertical plate 5, a limiting window 6, a side positioning plate 7, a connecting rod 8, a middle plate 9, a middle window 10, a top positioning plate 11, a stabilizing column 12, a track window 13, a horizontal plate 14, a horizontal hydraulic rod 15, a mounting frame 16, a side electric telescopic rod 17, a top plate 18, a transverse stabilizing window 19, an upper positioning bolt 20, an upper positioning nut 21, an upper drilling mechanism 22, a lower electric telescopic rod 23, a base plate 24, and a longitudinal stabilizer. Window 25, lower positioning bolt 26, lower positioning nut 27, and lower drilling mechanism 28; a placement frame 2 is fixed to the top of the base plate 1; a limiting window 6 is opened through the top of one end of the placement frame 2; a vertical plate 5 is installed through the limiting window 6; a side positioning plate 7 is fixed to the bottom of the vertical plate 5; the side positioning plate 7 is set inside the placement frame 2; a connecting rod 8 is rotatably installed on the top of the inner side of the vertical plate 5; the bottom end of the connecting rod 8 is rotatably connected to the top surface of the middle plate 9; the middle part of the middle plate 9 is attached to the inner wall of the middle window 10; the middle window 10 is opened at the top center of the placement frame 2; a top positioning plate 11 is fixed to the bottom of the middle plate 9. A stabilizing column 12 is fixed to the outer side of the placement frame 2. The stabilizing column 12 fits against the inner wall of the track window 13. The track window 13 is opened at one end of the horizontal plate 14. One end face of the horizontal plate 14 is connected and fixed to one end of the horizontal hydraulic rod 15. The other end of the horizontal hydraulic rod 15 is fixed to the outer wall of the placement frame 2. The other end of the horizontal plate 14 is connected and fixed to the mounting frame 16. A side electric telescopic rod 17 is fixed to the outer side of the mounting frame 16. The top end of the side electric telescopic rod 17 is connected and fixed to the bottom edge of the top plate 18. A horizontal stabilizing window 19 is opened through one side of the top of the top plate 18. An upper positioning bolt 20 is installed through the interior, and an upper positioning nut 21 is installed at the top of the upper positioning bolt 20. The bottom end of the upper positioning bolt 20 is connected and fixed to the top of the upper drilling mechanism 22. A lower electric telescopic rod 23 is fixedly installed on the bottom surface of the mounting frame 16. The bottom end of the lower electric telescopic rod 23 is connected and fixed to the edge of the top surface of the base plate 24. A longitudinal stabilizing window 25 is opened through the base plate 24. A lower positioning bolt 26 is installed through the longitudinal stabilizing window 25. A lower positioning nut 27 is installed at the bottom end of the lower positioning bolt 26. The top end of the lower positioning bolt 26 is connected and fixed to the bottom of the lower drilling mechanism 28.

[0026] In this example, a servo motor 3 is fixed to the top of the placement frame 2. A horizontal threaded rod 4 is installed at the output end of the servo motor 3. The horizontal threaded rod 4 is rotatably installed on the top surface of the substrate 1 through a bearing seat. The horizontal threaded rod 4 passes through the middle of the vertical plate 5. The above structural design allows the servo motor 3 to drive the horizontal threaded rod 4 to rotate stably. The horizontal threaded rod 4 can stably drive the vertical plate 5 to move horizontally by means of the threaded connection.

[0027] The servo motor 3, horizontal threaded rod 4, vertical plate 5, limiting window 6, and side positioning plate 7 are all horizontally symmetrically distributed about the center of the placement frame 2. The horizontal threaded rod 4 is threadedly connected to the vertical plate 5, and the vertical plate 5 is slidably connected to the limiting window 6. The above structural design allows the symmetrically distributed vertical plate 5 and side positioning plate 7 to move stably towards the center of the placement frame 2 at the same time, so as to perform stable horizontal compression positioning on the iron frame bed connecting parts and fix the connecting rod 8.

[0028] The connecting rod 8 is inclined and symmetrically distributed about the center of the middle plate 9. The above structural design allows the vertical plate 5 to drive the connecting rod 8 to rotate and push the middle plate 9 downward when it moves horizontally, so that the middle plate 9 can make a stable vertical sliding displacement along the middle window 10.

[0029] The stabilizing column 12 and the horizontal plate 14 are symmetrically distributed about the center of the placement frame 2. The side view of the stabilizing column 12 is T-shaped. The stabilizing column 12 is symmetrically distributed about the center of the track window 13. The above structural design ensures that the horizontal plate 14 can slide horizontally relative to the stabilizing column 12 with the track window 13, and the horizontal plate 14 is not easy to shake or tilt, nor will it detach from the stabilizing column 12.

[0030] The upper positioning bolts 20 are symmetrically distributed about the center of the transverse stabilizing window 19. The upper positioning bolts 20 and the transverse stabilizing window 19 are slidably connected. The above structural design enables the upper positioning bolts 20 to adjust the horizontal spacing of the connected upper drilling mechanism 22 in a stable manner.

[0031] The upper drilling mechanism 22 is symmetrically distributed about the lower drilling mechanism 28. The bottom of the drill bit at the bottom of the upper drilling mechanism 22 is at a higher level than the bottom of the top positioning plate 11. The top of the drill bit at the top of the lower drilling mechanism 28 is at a lower level than the bottom of the inner side of the placement frame 2. The above mechanism design can prevent the connecting parts from colliding with the drill bits of the upper drilling mechanism 22 and the lower drilling mechanism 28 when they are fixed.

[0032] The lower positioning bolt 26 is slidably connected to the longitudinal stabilizing window 25. The length of the longitudinal stabilizing window 25 is greater than half the length of the base plate 24. The center of the longitudinal stabilizing window 25 and the center of the transverse stabilizing window 19 are on the same vertical plane. The above structural design ensures that the lower positioning bolt 26 can carry the lower drilling mechanism 28 to make a large range of position adjustments along the longitudinal stabilizing window 25. In conjunction with the upper positioning bolt 20 and the transverse stabilizing window 19, the upper drilling mechanism 22 and the lower drilling mechanism 28 can drill bolt mounting holes with different spacing and triangular distribution at the ends of connectors of different specifications.

[0033] Working principle: When using this device, first align the center of the connector to be processed with the center of the placement rack 2, and place it on the rack. Figure 3 Place the connector on the inner bottom surface of the middle rack 2, and then push the connector towards... Figure 5The mounting frame 16 slides in one direction. When the end of the connector moves to the inside of the mounting frame 16, the pushing of the connector stops, and the control is maintained. Figure 2 The symmetrically distributed servo motors 3 work, synchronously driving the symmetrically distributed horizontal threaded rods 4 to rotate in the same direction at the same speed. The horizontal threaded rods 4 use the threaded connection to drive the vertical plate 5 to slide horizontally along the limiting window 6 towards the center of the placement frame 2 with the side positioning plate 7. The side positioning plate 7 is close to the side of the connector. At the same time, the vertical plate 5 pushes the connecting rod 8 to rotate. The rotation of the connecting rod 8 pushes the middle plate 9 to move vertically downward along the middle window 10 with the top positioning plate 11. When the symmetrically distributed side positioning plate 7 is tightly attached to the side of the connector and the top positioning plate 11 is tightly attached to the top surface of the connector, the servo motor 3 is controlled to stop working. The position of the vertical plate 5 is fixed by the thread self-locking, thereby fixing the positions of the side positioning plate 7 and the top positioning plate 11 and stabilizing the connector.

[0034] Next control Figure 1 The horizontal hydraulic rod 15 in the middle extends or shortens, causing the horizontal hydraulic rod 15 to push the horizontal plate 14 to slide relative to the track window 13 and the stabilizing column 12. The mounting frame 16, the upper drilling mechanism 22 and the lower drilling mechanism 28 at the end of the horizontal plate 14 move horizontally synchronously until the upper drilling mechanism 22 and the lower drilling mechanism 28 are aligned with the expected drilling position at the end of the connector, and the horizontal hydraulic rod 15 is controlled to stop working.

[0035] Then Figure 4 and Figure 5 The upper positioning nut 21 is screwed up, and the lower positioning nut 27 is screwed down. The upper positioning nut 21 no longer presses against the top surface of the top plate 18, fixing the position of the symmetrically distributed upper drilling mechanism 22. The lower positioning nut 27 no longer presses against the bottom surface of the bottom plate 24, fixing the position of the lower drilling mechanism 28. According to the specifications of the fixed connecting parts and referring to the preset drilling spacing requirements, the symmetrically distributed upper drilling mechanism 22 is pushed to slide along the transverse stabilizing window 19 with the upper positioning bolt 20 to adjust the horizontal spacing. The lower drilling mechanism 28 is pushed to slide along the longitudinal stabilizing window 25 with the lower positioning bolt 26 to adjust the horizontal spacing with the upper drilling mechanism 22. When the spacing between the upper drilling mechanism 22 and the lower drilling mechanism 28 is appropriate, the upper positioning nut 21 is screwed down to reset, and the lower positioning nut 27 is screwed up to reset, fixing the positions of the upper drilling mechanism 22 and the lower drilling mechanism 28.

[0036] Finally, the control side electric telescopic rod 17 shortens, the control lower electric telescopic rod 23 shortens, the upper drilling mechanism 22 moves down, and the lower drilling mechanism 28 moves up. At a suitable position at the end of the connector, bolt mounting holes with appropriate spacing and distributed in a triangle are drilled. Then, the control side electric telescopic rod 17 and the lower electric telescopic rod 23 extend and reset, so that the drill bits of the upper drilling mechanism 22 and the lower drilling mechanism 28 can be separated from the connector.

[0037] During continuous production, after each drilling operation, the symmetrically distributed servo motors 3 drive the horizontal threaded rod 4 to rotate in the opposite direction. The horizontal threaded rod 4 drives the vertical plate 5 and the side positioning plate 7 to reset away from the side of the connector. The vertical plate 5 pulls the connecting rod 8 to rotate, causing the middle plate 9 and the top positioning plate 11 to move upward and reset, releasing the fixing of the completed connector. The connector is then pulled out, and a new connector is placed on the placement frame 2 according to the previous operation. The servo motors 3 are then controlled to drive the horizontal threaded rod 4 to rotate forward again, fixing the new connector. The side electric telescopic rod 17 and the lower electric telescopic rod 23 are then shortened, driving the upper drilling mechanism 22 and the lower drilling mechanism 28 to perform another drilling operation. This process is repeated to achieve continuous and accurate automatic drilling of the iron frame bed connectors. This is the working principle of the automatic processing device for iron frame bed connectors.

[0038] 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. An automatic processing device for iron frame bed connectors, comprising a base plate (1), characterized in that: A mounting frame (2) is fixed to the top of the substrate (1). A limiting window (6) is opened through the top of one end of the mounting frame (2). A vertical plate (5) is installed through the limiting window (6). A side positioning plate (7) is fixed to the bottom of the vertical plate (5). The side positioning plate (7) is set inside the mounting frame (2). A connecting rod (8) is rotatably installed on the top of the inner side of the vertical plate (5). The bottom end of the connecting rod (8) is rotatably connected to the top surface of the middle plate (9). The middle part of the middle plate (9) is attached to the inner wall of the middle window (10). The central window (10) is located at the top center of the placement frame (2). A top positioning plate (11) is fixed to the bottom end of the central plate (9). A stabilizing column (12) is fixed to the outer side of the placement frame (2). The stabilizing column (12) is attached to the inner wall of the track window (13). The track window (13) is located at one end of the horizontal plate (14). One end face of the horizontal plate (14) is connected and fixed to one end of the horizontal hydraulic rod (15). The other end of the horizontal hydraulic rod (15) is fixed to the outer wall of the placement frame (2). The horizontal plate (10) is located at the top center of the placement frame (2). 4) The other end is connected and fixed to the mounting frame (16). A side electric telescopic rod (17) is fixed to the outer side of the mounting frame (16). The top end of the side electric telescopic rod (17) is connected and fixed to the bottom edge of the top plate (18). A transverse stabilizing window (19) is provided through one side of the top of the top plate (18). An upper positioning bolt (20) is installed through the transverse stabilizing window (19). An upper positioning nut (21) is installed at the top of the upper positioning bolt (20). The bottom end of the upper positioning bolt (20) is connected to the upper drilling mechanism ( 22) Top connection and fixation: The bottom surface of the mounting frame (16) is fixedly installed with a lower electric telescopic rod (23). The bottom end of the lower electric telescopic rod (23) is connected and fixed to the edge of the top surface of the base plate (24). A longitudinal stabilizing window (25) is opened through the base plate (24). A lower positioning bolt (26) is installed through the longitudinal stabilizing window (25). A lower positioning nut (27) is installed at the bottom end of the lower positioning bolt (26). The top end of the lower positioning bolt (26) is connected and fixed to the bottom of the lower drilling mechanism (28).

2. The automatic processing device for iron frame bed connectors according to claim 1, characterized in that: The top of the placement frame (2) is fixed with a servo motor (3), and the output end of the servo motor (3) is equipped with a horizontal threaded rod (4). The horizontal threaded rod (4) is rotatably installed on the top surface of the substrate (1) through a bearing seat, and the horizontal threaded rod (4) passes through the middle of the vertical plate (5).

3. The automatic processing device for iron frame bed connectors according to claim 2, characterized in that: The servo motor (3), horizontal threaded rod (4), vertical plate (5), limiting window (6) and side positioning plate (7) are all horizontally symmetrically distributed about the center of the placement frame (2). The horizontal threaded rod (4) and the vertical plate (5) are threadedly connected, and the vertical plate (5) and the limiting window (6) are slidably connected.

4. The automatic processing device for iron frame bed connectors according to claim 1, characterized in that: The connecting rod (8) is inclined and is symmetrically distributed about the center of the middle plate (9).

5. The automatic processing device for iron frame bed connectors according to claim 1, characterized in that: The stabilizing column (12) and the horizontal plate (14) are symmetrically distributed about the center of the placement frame (2). The side view cross-sectional shape of the stabilizing column (12) is "T" shaped. The stabilizing column (12) is symmetrically distributed about the center of the track window (13).

6. The automatic processing device for iron frame bed connectors according to claim 1, characterized in that: The upper positioning bolts (20) are symmetrically distributed about the center of the transverse stabilizing window (19), and the upper positioning bolts (20) and the transverse stabilizing window (19) are slidably connected.

7. The automatic processing device for iron frame bed connectors according to claim 1, characterized in that: The upper drilling mechanism (22) is symmetrically distributed about the lower drilling mechanism (28). The bottom of the drill bit at the bottom of the upper drilling mechanism (22) is at a higher level than the bottom of the top positioning plate (11). The top of the drill bit at the top of the lower drilling mechanism (28) is at a lower level than the bottom of the inner side of the placement frame (2).

8. The automatic processing device for iron frame bed connectors according to claim 1, characterized in that: The lower positioning bolt (26) is slidably connected to the longitudinal stabilizing window (25). The length of the longitudinal stabilizing window (25) is greater than half the length of the base plate (24). The center of the longitudinal stabilizing window (25) and the center of the transverse stabilizing window (19) are on the same vertical plane.

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