Finish machining mechanism for steering knuckle of medium-sized commercial vehicle

Abstract

The utility model relates to the technical field of machining, in particular to a middle-sized commercial vehicle steering knuckle finish machining mechanism, which not only can finish a steering knuckle, but also can drill the steering knuckle, and compared with the prior art, the steering knuckle finish machining mechanism has the advantages that the transfer and disassembly of the steering knuckle in the finish machining process are reduced, the labor intensity is reduced, and the efficiency is improved. Use is convenient, and practicability is high; comprising a support and a supporting plate fixedly installed at the upper end of the support. The machining device comprises a base, a supporting frame, a clamping mechanism, a rotating mechanism, a moving mechanism, a turning mechanism and a drilling mechanism, the clamping mechanism is installed on the rotating mechanism, the rotating mechanism is used for rotating the clamping mechanism, the clamping mechanism has the clamping and fixing functions, the rotating mechanism is installed on the moving mechanism, and the moving mechanism is used for moving the rotating mechanism left and right. The supporting frame is fixedly installed on the supporting plate, the turning mechanism and the drilling mechanism are both installed on the supporting frame, the turning mechanism has a turning function, and the drilling mechanism has a drilling function.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a steering knuckle finishing mechanism for a medium-sized commercial vehicle. Background Art

[0002] The steering knuckle on a medium-sized commercial vehicle is a part used to transmit and bear the front load of the vehicle and can be used to transmit the direction of travel. It is an important part of the vehicle steering axle. Figure 7 It is mainly composed of a flange and a support shaft. A positioning surface is provided on the flange, and a mounting hole is provided on the support shaft. The axis of the mounting hole is perpendicular to the positioning surface on the flange, and the flange is coaxial with the support shaft. During production, the flange is first processed, and then the support shaft and the mounting hole are processed by rough processing. Then, the outer wall of the support shaft and the mounting hole on the support shaft are finely processed to the specified size.

[0003] At present, when finishing the steering knuckle, it is first necessary to use a lathe to finish the support shaft on the steering knuckle to the specified diameter, and then transfer it to a drilling machine, and use the drilling machine to process the mounting hole on the support shaft to the specified size. The workpiece needs to be transferred between the drilling machine and the lathe during the finishing process. A lot of time will be wasted in the process of disassembling and transferring the workpiece on the lathe, resulting in reduced processing efficiency and inconvenience in use. Therefore, a finishing mechanism with both turning and drilling functions is needed. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a steering knuckle finishing mechanism for medium-sized commercial vehicles which can not only perform finish turning on the steering knuckle, but also perform drilling on the steering knuckle. Compared with the prior art, the transportation and disassembly of the steering knuckle during the finish machining process is reduced, the labor intensity is reduced, the efficiency is improved, and the use is convenient and the practicality is high.

[0005] The utility model discloses a finishing mechanism for the steering knuckle of a medium-sized commercial vehicle, comprising a bracket and a support plate, wherein the support plate is fixedly mounted on the upper end of the bracket; the utility model also comprises a support frame, a clamping mechanism, a rotating mechanism, a moving mechanism, a turning mechanism and a drilling mechanism, wherein the clamping mechanism is mounted on the rotating mechanism, the rotating mechanism is used to rotate the clamping mechanism, the clamping mechanism has a clamping and fixing function, the rotating mechanism is mounted on the moving mechanism, the moving mechanism is used to move the rotating mechanism left and right, the support frame is fixedly mounted on the support plate, the turning mechanism and the drilling mechanism are both mounted on the support frame, the turning mechanism has a turning function, and the drilling mechanism has a drilling function; when finishing the steering knuckle of a medium-sized commercial vehicle, firstly, the steering knuckle is fixedly mounted on the support plate, the turning mechanism has a turning function, and the drilling mechanism has a drilling function. The flange on the knuckle is clamped and fixed by a clamping mechanism, and then the rotating mechanism drives the clamping mechanism to move through the moving mechanism, and then the clamping mechanism drives the steering knuckle to move to a position close to the drilling mechanism and the turning mechanism for fine turning and drilling, so that the outer wall of the support shaft on the steering knuckle is fine turned to a suitable diameter and then the mounting hole on the support shaft is drilled to a specified size by the drilling mechanism; when the steering knuckle is finely processed, not only the steering knuckle can be fine turned, but also the steering knuckle can be drilled. Compared with the prior art, the transportation and disassembly of the steering knuckle during the fine processing process is reduced, the labor intensity is reduced, the efficiency is improved, the use is convenient, and the practicability is high.

[0006] Preferably, the moving mechanism includes an electric slide rail and a sliding plate, the electric slide rail is fixedly mounted on the upper end of the support plate, the sliding plate is mounted on the electric slide rail, the electric slide rail is used to move the sliding plate left and right, and the rotating mechanism is mounted on the upper end of the sliding plate; when finishing the steering knuckle, open the electric slide rail, the electric slide rail enables the rotating mechanism to drive the clamping mechanism to move through the sliding plate, and the clamping mechanism drives the steering knuckle to move until the steering knuckle moves in the left and right directions to a position suitable for processing; this facilitates the finishing of the steering knuckle.

[0007] Preferably, the clamping mechanism includes a three-jaw chuck and a positioning plate, and the positioning plate is fixedly mounted on the upper part of the three-jaw chuck; when the flange on the steering knuckle is clamped and fixed by the three-jaw chuck, the positioning surface on the flange is pressed against the lower end surface of the positioning plate, and then the flange is clamped and fixed by the three-jaw chuck. When drilling the mounting hole on the support shaft, the clamping angle of the steering knuckle can be determined by the tight contact between the positioning plate and the positioning surface, which facilitates the clamping mechanism to drive the steering knuckle to rotate to a specified angle through the rotating mechanism for drilling, thereby improving convenience.

[0008] Preferably, the rotating mechanism includes a vertical plate, a stepper motor, a rotating shaft and a pointer A, the vertical plate is fixedly mounted on the upper end of the sliding plate, the stepper motor is fixedly mounted on the left end of the sliding plate, the rotating shaft is rotatably mounted on the sliding plate, the left end of the rotating shaft is connected to the output end of the stepper motor, the three-jaw chuck is fixedly mounted on the right end of the rotating shaft, the pointer A is fixedly mounted on the rotating shaft, an angle line is provided on the vertical plate, and the pointer A points to the angle line; when drilling the mounting hole on the steering knuckle, turn on the stepper motor, rotate the rotating shaft by the stepper motor, and drive the pointer A to rotate by the rotating shaft, and the rotation angle of the rotating shaft can be inferred by the value of the angle line pointed by the pointer A, and then the rotating shaft drives the steering knuckle to rotate through the three-jaw chuck, until the mounting hole on the steering knuckle rotates to be parallel to the angle of the hole drilled on the drilling mechanism, and then the mounting hole can be drilled.

[0009] Preferably, the turning mechanism includes a hydraulic cylinder A, a push rod, a tool holder and a fine turning tool, the hydraulic cylinder A is fixedly mounted on the rear end of the support frame, the push rod is slidably mounted on the support frame forward and backward, the rear end of the push rod is connected to the output end of the hydraulic cylinder A, the tool holder is fixedly mounted on the front end of the push rod, and the fine turning tool is fixedly mounted on the front end of the tool holder; when fine turning the support shaft on the steering knuckle, first turn on the stepper motor, the stepper motor drives the three-jaw chuck to drive the steering knuckle to rotate at high speed through the rotating shaft, and then the support shaft on the steering knuckle rotates at high speed, and then the push rod drives the tool holder and the fine turning tool to move forward through the hydraulic cylinder A, until the fine turning tool contacts the outer wall of the support shaft, until the fine turning tool fine turns the outer wall of the support shaft, until the outer wall of the support shaft is turned to a specified size, and at the same time, the vertical plate drives the rotating shaft and the three-jaw chuck to move right through the moving mechanism, the three-jaw chuck drives the steering knuckle to move right, and then the rotating support shaft is evenly turned by the fine turning tool while moving to the right; this facilitates the fine turning of the support shaft on the steering knuckle.

[0010] Preferably, the drilling mechanism includes a hydraulic cylinder B, a sliding rod, a lifting plate, a mounting frame, a driving motor and a spindle, the hydraulic cylinder B is fixedly mounted on the upper end of the support frame, the sliding rod is slidably mounted on the support frame, the upper end of the sliding rod is connected to the output end of the hydraulic cylinder B, the lifting plate is fixedly mounted on the lower end of the sliding rod, the mounting frame is fixedly mounted on the lower end of the lifting plate, the driving motor is fixedly mounted on the lifting plate, the spindle is rotatably mounted on the mounting frame, the upper end of the spindle is connected to the output end of the driving motor, and a drill is arranged at the lower end of the spindle; when drilling the mounting hole on the steering knuckle, firstly, the rotating mechanism is driven by the moving mechanism to move the clamping Move in the left and right directions, so that the clamping mechanism drives the supporting shaft on the steering knuckle to move in the left and right directions to just below the main shaft, and then the clamping mechanism drives the steering knuckle to rotate through the rotating mechanism, so that the mounting hole rotates to rush towards the main shaft, and then the drive motor is turned on, and the drive motor drives the drill bit to rotate through the main shaft, and then the hydraulic cylinder B is turned on. The hydraulic cylinder B drives the lifting plate to drive the mounting frame and the rotating main shaft to descend through the sliding rod, and then the rotating drill bit is lowered. The rotating drill bit contacts the mounting hole during the descent process, so that the rotating drill bit drills the mounting hole and drills the mounting hole to the specified diameter, which facilitates the processing of the mounting hole.

[0011] Preferably, it also includes a controller, which is fixedly installed on the upper end of the support plate, and the electric slide rail, hydraulic cylinder A, hydraulic cylinder B and stepper motor are all connected to the controller, and the controller has a control function; during the processing, the controller automatically controls the actions of the electric slide rail, hydraulic cylinder A, hydraulic cylinder B and stepper motor, thereby improving convenience.

[0012] Compared with the prior art, the beneficial effects of the utility model are: not only can the steering knuckle be precision-turned, but the steering knuckle can also be drilled. Compared with the prior art, the transportation and disassembly of the steering knuckle during the precision machining process is reduced, the labor intensity is reduced, the efficiency is improved, the use is convenient, and the practicability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the axonometric structure of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the drilling mechanism and the supporting frame;

[0015] Figure 3 It is a schematic diagram of the structure of the drive motor, mounting frame and spindle;

[0016] Figure 4 It is a structural diagram of the turning mechanism;

[0017] Figure 5 It is a schematic diagram of the structure of the rotating mechanism, pointer B and moving mechanism;

[0018] Figure 6It is a schematic structural diagram of the clamping mechanism;

[0019] Figure 7 It is a schematic structural diagram of the steering knuckle.

[0020] Reference numerals in the drawings: 1. Flange; 2. Support shaft; 3. Positioning surface; 4. Mounting hole; 5. Bracket; 6. Support plate; 7. Support frame; 8. Electric slide rail; 9. Slide plate; 10. Three-jaw chuck; 11. Positioning plate; 12. Vertical plate; 13. Stepper motor; 14. Rotating shaft; 15. Pointer A; 16. Hydraulic cylinder A; 17. Push rod; 18. Tool shank; 19. Precision turning tool; 20. Hydraulic cylinder B; 21. Slide bar; 22. Lifting plate; 23. Mounting frame; 24. Driving motor; 25. Spindle; 26. Controller; 27. Pointer B. Specific embodiments

[0021] For ease of understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0022] Embodiment 1

[0023] As Figures 1 to 7 , the fine machining mechanism for the steering knuckle of a medium-sized commercial vehicle of the present invention includes a bracket 5, a support plate 6, a support frame 7, a clamping mechanism, a rotating mechanism, a moving mechanism, a turning mechanism and a drilling mechanism. The support plate 6 is fixedly installed at the upper end of the bracket 5. The clamping mechanism is installed on the rotating mechanism, and the rotating mechanism is used to rotate the clamping mechanism. The clamping mechanism has the function of clamping and fixing. The rotating mechanism is installed on the moving mechanism, and the moving mechanism is used to move the rotating mechanism left and right. The support frame 7 is fixedly installed on the support plate 6. Both the turning mechanism and the drilling mechanism are installed on the support frame 7. The turning mechanism has the function of turning, and the drilling mechanism has the function of drilling. When finely machining the steering knuckle of a medium-sized commercial vehicle, first, the flange 1 on the steering knuckle is clamped and fixed by the clamping mechanism, and then the moving mechanism is used to drive the rotating mechanism to drive the clamping mechanism to move, so that the clamping mechanism drives the steering knuckle to move to a position close to the drilling mechanism and the turning mechanism for precision turning and drilling. After the outer side wall of the support shaft 2 on the steering knuckle is finely turned to a suitable diameter, the drilling mechanism drills the mounting hole 4 on the support shaft 2 to the specified size. When finely machining the steering knuckle, it can not only perform precision turning on the steering knuckle, but also drill holes in the steering knuckle. Compared with the prior art, it reduces the transportation and disassembly of the steering knuckle during the fine machining process, reduces the labor intensity, improves the efficiency, is easy to use, and has high practicability.

[0024] As Figure 5The moving mechanism includes an electric slide rail 8 and a sliding plate 9. The electric slide rail 8 is fixedly installed on the upper end of the support plate 6, and the sliding plate 9 is installed on the electric slide rail 8. The electric slide rail 8 is used to move the sliding plate 9 left and right, and the rotating mechanism is installed on the upper end of the sliding plate 9. When the steering knuckle is finished, the electric slide rail 8 is opened, and the electric slide rail 8 drives the clamping mechanism to move through the sliding plate 9, and the clamping mechanism drives the steering knuckle to move until the steering knuckle moves to a position suitable for processing in the left and right directions; this facilitates the finishing of the steering knuckle.

[0025] like Figure 6 The clamping mechanism includes a three-jaw chuck 10 and a positioning plate 11, and the positioning plate 11 is fixedly installed on the upper part of the three-jaw chuck 10; when the flange 1 on the steering knuckle is clamped and fixed by the three-jaw chuck 10, the positioning surface 3 on the flange 1 is pressed against the lower end surface of the positioning plate 11, and then the flange 1 is clamped and fixed by the three-jaw chuck 10. When drilling the mounting hole 4 on the support shaft 2, the clamping angle of the steering knuckle can be determined by the tight contact between the positioning plate 11 and the positioning surface 3, which facilitates the clamping mechanism to drive the steering knuckle to rotate to a specified angle through the rotating mechanism for drilling, thereby improving convenience.

[0026] like Figure 1 and Figure 5 The rotating mechanism includes a vertical plate 12, a stepper motor 13, a rotating shaft 14 and a pointer A15. The vertical plate 12 is fixedly mounted on the upper end of the sliding plate 9, the stepper motor 13 is fixedly mounted on the left end of the sliding plate 9, the rotating shaft 14 is rotatably mounted on the sliding plate 9, the left end of the rotating shaft 14 is connected to the output end of the stepper motor 13, the three-jaw chuck 10 is fixedly mounted on the right end of the rotating shaft 14, the pointer A15 is fixedly mounted on the rotating shaft 14, an angle line is provided on the vertical plate 12, and the pointer A15 points to the angle line; when drilling the mounting hole 4 on the steering knuckle, turn on the stepper motor 13, rotate the rotating shaft 14 through the stepper motor 13, and the rotating shaft 14 drives the pointer A15 to rotate. The rotation angle of the rotating shaft 14 can be inferred through the value of the angle line pointed to by the pointer A15, and then the rotating shaft 14 drives the steering knuckle to rotate through the three-jaw chuck 10, until the mounting hole 4 on the steering knuckle rotates to be parallel to the drilling angle on the drilling mechanism, the mounting hole 4 can be drilled.

[0027] like Figure 1 and Figure 4The turning mechanism includes a hydraulic cylinder A16, a push rod 17, a tool holder 18 and a fine turning tool 19. The hydraulic cylinder A16 is fixedly mounted on the rear end of the support frame 7. The push rod 17 is slidably mounted on the support frame 7. The rear end of the push rod 17 is connected to the output end of the hydraulic cylinder A16. The tool holder 18 is fixedly mounted on the front end of the push rod 17. The fine turning tool 19 is fixedly mounted on the front end of the tool holder 18. When fine turning the support shaft 2 on the steering knuckle, first turn on the stepper motor 13. The stepper motor 13 drives the steering knuckle to rotate at high speed by the three-jaw chuck 10 through the rotating shaft 14, thereby causing the support shaft 2 on the steering knuckle to rotate at high speed. Then The push rod 17 is driven by the hydraulic cylinder A16 to drive the tool handle 18 and the fine turning tool 19 to move forward until the fine turning tool 19 contacts the outer wall of the support shaft 2, and the fine turning tool 19 fine turns the outer wall of the support shaft 2 until the outer wall of the support shaft 2 is turned to the specified size. At the same time, the vertical plate 12 is used to drive the rotating shaft 14 and the three-jaw chuck 10 to move right, and the three-jaw chuck 10 drives the steering knuckle to move right, thereby moving the rotating support shaft 2 to the right. The rotating support shaft 2 is evenly turned by the fine turning tool 19 while moving to the right, which facilitates the fine turning of the support shaft 2 on the steering knuckle.

[0028] like Figure 1 and Figure 2 The drilling mechanism includes a hydraulic cylinder B20, a sliding rod 21, a lifting plate 22, a mounting frame 23, a driving motor 24 and a spindle 25. The hydraulic cylinder B20 is fixedly mounted on the upper end of the support frame 7, the sliding rod 21 is slidably mounted on the support frame 7, the upper end of the sliding rod 21 is connected to the output end of the hydraulic cylinder B20, the lifting plate 22 is fixedly mounted on the lower end of the sliding rod 21, the mounting frame 23 is fixedly mounted on the lower end of the lifting plate 22, the driving motor 24 is fixedly mounted on the lifting plate 22, the spindle 25 is rotatably mounted on the mounting frame 23, the upper end of the spindle 25 is connected to the output end of the driving motor 24, and the lower end of the spindle 25 is provided with a drill bit; when drilling the mounting hole 4 on the steering knuckle, firstly, the rotating mechanism is driven by the moving mechanism. The dynamic clamping movement moves in the left and right directions, so that the clamping mechanism drives the support shaft 2 on the steering knuckle to move in the left and right directions to just below the main shaft 25, and then the clamping mechanism drives the steering knuckle to rotate through the rotating mechanism, so that the mounting hole 4 rotates to rush towards the main shaft 25, and then the drive motor 24 is turned on, and the drive motor 24 drives the drill bit to rotate through the main shaft 25, and then the hydraulic cylinder B20 is turned on. The hydraulic cylinder B20 drives the lifting plate 22 to drive the mounting frame 23 and the rotating main shaft 25 to descend through the sliding rod 21, thereby causing the rotating drill bit to descend. The rotating drill bit contacts the mounting hole 4 during the descent process, so that the rotating drill bit drills the mounting hole 4, and drills the mounting hole 4 to a specified diameter, thereby facilitating the processing of the mounting hole 4.

[0029] like Figure 1The controller 26 is fixedly installed on the upper end of the support plate 6, and the electric slide rail 8, hydraulic cylinder A16, hydraulic cylinder B20 and stepper motor 13 are all connected to the controller 26, and the controller 26 has a control function; during the processing, the actions of the electric slide rail 8, hydraulic cylinder A16, hydraulic cylinder B20 and stepper motor 13 are automatically controlled by the controller 26, which improves convenience.

[0030] Example 2

[0031] On the basis of Example 1, Figure 5 A pointer B27 is added to the sliding plate 9, and a scale line is set on the upper end of the support plate 6. The pointer B27 points to the scale line. The distance that the pointer B27 moves in the horizontal direction can be inferred by the numerical difference between the scale lines pointed by the pointer B27, thereby improving convenience.

[0032] The electric slide rail 8, three-jaw chuck 10, stepper motor 13, tool handle 18, finishing tool 19, drive motor 24 and controller 26 of the medium-sized commercial vehicle steering knuckle finishing mechanism of the utility model are all purchased on the market. The technicians in this industry only need to install and operate them according to the accompanying instruction manual, without the need for the technicians in this field to make creative labor.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A steering knuckle finishing mechanism for a medium-sized commercial vehicle, comprising a bracket (5) and a support plate (6), wherein the support plate (6) is fixedly mounted on the upper end of the bracket (5); characterized in that: The invention also comprises a support frame (7), a clamping mechanism, a rotating mechanism, a moving mechanism, a turning mechanism and a drilling mechanism. The clamping mechanism is mounted on the rotating mechanism. The rotating mechanism is used to rotate the clamping mechanism. The clamping mechanism has a clamping and fixing function. The rotating mechanism is mounted on the moving mechanism. The moving mechanism is used to move the rotating mechanism left and right. The support frame (7) is fixedly mounted on the support plate (6). The turning mechanism and the drilling mechanism are both mounted on the support frame (7). The turning mechanism has a turning function. The drilling mechanism has a drilling function.

2. A medium-sized commercial vehicle steering knuckle finishing mechanism as claimed in claim 1, characterized in that: The moving mechanism comprises an electric slide rail (8) and a sliding plate (9), wherein the electric slide rail (8) is fixedly mounted on the upper end of the support plate (6), the sliding plate (9) is mounted on the electric slide rail (8), the electric slide rail (8) is used to move the sliding plate (9) left and right, and the rotating mechanism is mounted on the upper end of the sliding plate (9).

3. A medium-sized commercial vehicle steering knuckle finishing mechanism as claimed in claim 1, characterized in that: The clamping mechanism comprises a three-jaw chuck (10) and a positioning plate (11), wherein the positioning plate (11) is fixedly mounted on the upper part of the three-jaw chuck (10).

4. A medium-sized commercial vehicle steering knuckle finishing mechanism as claimed in claim 2, characterized in that: The rotating mechanism comprises a vertical plate (12), a stepping motor (13), a rotating shaft (14) and a pointer A (15); the vertical plate (12) is fixedly mounted on the upper end of the sliding plate (9); the stepping motor (13) is fixedly mounted on the left end of the sliding plate (9); the rotating shaft (14) is rotatably mounted on the sliding plate (9); the left end of the rotating shaft (14) is connected to the output end of the stepping motor (13); the three-jaw chuck (10) is fixedly mounted on the right end of the rotating shaft (14); the pointer A (15) is fixedly mounted on the rotating shaft (14); an angle line is arranged on the vertical plate (12); and the pointer A (15) points to the angle line.

5. A medium-sized commercial vehicle steering knuckle finishing mechanism as claimed in claim 1, characterized in that: The turning mechanism comprises a hydraulic cylinder A (16), a push rod (17), a tool holder (18) and a finishing tool (19); the hydraulic cylinder A (16) is fixedly mounted on the rear end of the support frame (7); the push rod (17) is slidably mounted on the support frame (7) forward and backward; the rear end of the push rod (17) is connected to the output end of the hydraulic cylinder A (16); the tool holder (18) is fixedly mounted on the front end of the push rod (17); and the finishing tool (19) is fixedly mounted on the front end of the tool holder (18).

6. A medium-sized commercial vehicle steering knuckle finishing mechanism as claimed in claim 1, characterized in that: The drilling mechanism comprises a hydraulic cylinder B (20), a sliding rod (21), a lifting plate (22), a mounting frame (23), a driving motor (24) and a main shaft (25); the hydraulic cylinder B (20) is fixedly mounted on the upper end of the support frame (7); the sliding rod (21) is slidably mounted on the support frame (7) up and down; the upper end of the sliding rod (21) is connected to the output end of the hydraulic cylinder B (20); the lifting plate (22) is fixedly mounted on the lower end of the sliding rod (21); the mounting frame (23) is fixedly mounted on the lower end of the lifting plate (22); the driving motor (24) is fixedly mounted on the lifting plate (22); the main shaft (25) is rotatably mounted on the mounting frame (23); the upper end of the main shaft (25) is connected to the output end of the driving motor (24); and the lower end of the main shaft (25) is provided with a drill bit.

7. A medium-sized commercial vehicle steering knuckle finishing mechanism as claimed in claim 6, characterized in that: The invention also comprises a controller (26), which is fixedly mounted on the upper end of the support plate (6); the electric slide rail (8), the hydraulic cylinder A (16), the hydraulic cylinder B (20) and the stepping motor (13) are all connected to the controller (26), and the controller (26) has a control function.

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