A turning and milling combined machine tool

Abstract

This disclosure relates to the field of machine tool technology. One embodiment of this disclosure provides a turning-milling composite machine tool, which includes a connecting box, a first fixed plate, an adjustment mechanism, a first connecting rail, a second fixed plate, a second connecting rail, a third fixed plate, an auxiliary mechanism, a third connecting rail, a fixing mechanism, and a support mechanism. The first fixed plate is mounted on the upper surface of the connecting box, and the first connecting rail is mounted on the upper surface of the first fixed plate. The adjustment mechanism is disposed inside the connecting box, and the second fixed plate is disposed above the adjustment mechanism. The first connecting rail is slidably connected to the second fixed plate, and the second connecting rail is mounted on the upper surface of the second fixed plate. The auxiliary mechanism is disposed on the upper surface of the second fixed plate, and the third fixed plate is slidably connected to the outside of the second connecting rail. This technical solution addresses the technical problem in the prior art where vibration occurs during workpiece processing, affecting the overall stability of the machine.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of machine tool technology, and more specifically, to a turning-milling composite machine tool. Background Technology

[0002] Composite machine tools are multi-functional machining tools. Composite machine tools include various forms such as turning-milling composite, turning-milling-grinding composite, milling-grinding composite, cutting and 3D printing composite, cutting and ultrasonic vibration composite, laser and stamping composite, etc. The purpose of composite is to make a machine tool multi-functional, which can complete multiple tasks in one clamping, thereby improving processing efficiency and processing accuracy.

[0003] Existing milling and turning composite machine tools fix the workpiece with a three-jaw chuck and a follower post, so that the left and right ends of the workpiece are in the same center. The rotation of the three-jaw chuck drives the workpiece to rotate, and the workpiece is machined by the axial movement of the tool. However, when machining heavy workpieces, the radial force causes the machine tool to vibrate, which affects the machining accuracy of the device.

[0004] The aforementioned milling and turning machine tool is prone to vibration during workpiece processing due to radial force, which reduces the overall stability of the device and thus its effectiveness. Utility Model Content

[0005] To overcome the above-mentioned defects, embodiments of this disclosure provide a milling and turning composite machine tool to solve the technical problem that vibration occurs during the machining of workpieces in the prior art, affecting the overall stability.

[0006] According to one aspect, at least one embodiment of this disclosure provides a milling and turning machine tool, which includes a connecting housing and further includes: The first fixing plate is installed on the upper surface of the connecting box, and a first connecting rail is installed on the upper surface of the first fixing plate. The adjusting mechanism is disposed inside the connecting box. The second fixing plate is disposed above the adjusting mechanism. The first connecting rail is slidably connected to the second fixing plate. A second connecting rail is installed on the upper surface of the second fixing plate. The auxiliary mechanism is disposed on the upper surface of the second fixing plate. The third fixing plate is slidably connected to the outside of the second connecting rail. A third connecting rail is installed on the upper surface of the third fixing plate. The fixing mechanism is installed on the upper surface of the third fixing plate. The supporting mechanism is installed on the upper surface of the third fixing plate.

[0007] In a preferred embodiment of the milling and turning composite machine tool of this utility model, the adjustment mechanism includes a connecting frame, a first drive motor, a threaded rod, a pulley, a belt, a threaded tube, and a moving plate for better workpiece position adjustment. The connecting frame is installed on the side of the connecting box, and the first drive motor is installed on the side of the connecting frame. The threaded rod is rotatably connected to the inside of the connecting box, and the end of the threaded rod near the connecting frame is connected to the pulley via a belt drive. The output end of the first drive motor passes through the inside of the threaded rod near the connecting frame. The threaded tube is threaded onto the outer surface of the threaded rod, and a moving plate is installed on the outer surface of the threaded tube.

[0008] In a preferred embodiment of the milling and turning composite machine tool of this utility model, in order to enable the moving plate to move with the second fixed plate, the moving plate is slidably connected to the first fixed plate, and the upper surface of the moving plate is mounted on the lower surface of the second fixed plate.

[0009] In a preferred embodiment of the milling and turning composite machine tool of this utility model, in order to adjust the workpiece in the front-to-back direction, the auxiliary mechanism includes a push rod motor and a moving frame. The push rod motor is mounted on the upper surface of the second fixed plate, and the moving frame is mounted on the output end of the push rod motor.

[0010] In a preferred embodiment of the milling and turning composite machine tool described in this utility model, the inner side of the movable frame is installed inside the third fixed plate to facilitate the operator's adjustment of the position of the third fixed plate.

[0011] In a preferred embodiment of the milling and turning composite machine tool of this utility model, the fixing mechanism includes a first mounting plate, a fixing pin, a support plate, a first reinforcing plate, a connecting shaft, a three-jaw chuck, and a second transmission motor for better workpiece fixation. The first mounting plate is mounted on the upper surface of the third fixing plate via the fixing pin. The first mounting plate is slidably connected to the third connecting rail. The support plate is mounted on the upper surface of the first mounting plate. The connecting shaft is rotatably connected inside the support plate, and a three-jaw chuck is mounted on the inner end of the connecting shaft.

[0012] In a preferred embodiment of the milling and turning composite machine tool of this utility model, in order for the workpiece to rotate with the rotation of the second drive motor, a first reinforcing plate is installed on the outer side of the support plate, and a second drive motor is installed on the side of the support plate near the top of the first drive motor. The output end of the second drive motor passes through the connecting shaft near the top of the first drive motor.

[0013] In a preferred embodiment of the milling and turning composite machine tool described in this utility model, to prevent the workpiece from deviating from its center during machining, the support mechanism includes a second mounting plate, a connecting pin, a connecting pipe, a second reinforcing plate, a buffer spring, a moving column, a plug pin, a support frame, a support rod, and a moving block. The second mounting plate is fixed to the upper surface of the third fixed plate by the connecting pin. The connecting pipe is mounted on the upper surface of the second mounting plate. A buffer spring is installed inside the connecting pipe, and a second reinforcing plate is installed on the outer surface of the connecting pipe. A moving column is installed at the top of the buffer spring and passes through the connecting pipe. The plug pin passes through the outer surface of the connecting pipe, and one end of the plug pin, which passes through the connecting pipe, abuts against the moving column. The support frame is mounted at the top of the moving column, and a support rod is threaded through the inside of the support frame. A moving block is installed at the bottom of the support rod.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the workpiece's machining position is adjusted by adjusting the mechanism and auxiliary mechanism, and then the workpiece is rotated by the fixing mechanism. Compared with the direct machining of the prior art, this device can make the workpiece move with the change of machining position, so that the workpiece moving tool only moves axially to offset the influence of radial force on the whole, and weaken the vibration effect generated during the workpiece machining process.

[0015] In this disclosure, the surface of slender or heavy shafts is provided with secondary support through a support mechanism, and then the workpiece is processed simultaneously by machine tools installed on the front and rear sides. Compared with the prior art, which has difficulty stabilizing slender or heavy shafts, this device can play a stabilizing role in the processing of slender or heavy shafts, allowing operators to set multiple support points to support the workpiece as needed, thereby improving the processing accuracy of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the processing mechanism of this utility model; Figure 3 This is a vertical sectional view of the connecting box and the adjustment mechanism in this utility model. Figure 4 This is an exploded view of the structure in which the second fixing plate and the auxiliary mechanism work together in this utility model; Figure 5 This is an exploded view of the structure of the third fixing plate and the support mechanism in this utility model.

[0018] In the diagram: 1. Connecting box; 2. First fixed plate; 3. Connecting frame; 4. First drive motor; 5. Threaded rod; 6. Pulley; 7. Belt; 8. Threaded pipe; 9. Moving plate; 10. First connecting rail; 11. Second fixed plate; 12. Second connecting rail; 13. Third fixed plate; 14. Push rod motor; 15. Moving frame; 16. Third connecting rail; 17. First mounting plate; 18. Fixing pin; 19. Support plate; 20. First reinforcing plate; 21. Connecting shaft; 22. Three-jaw chuck; 23. Second drive motor; 24. Second mounting plate; 25. Connecting pin; 26. Connecting pipe; 27. Second reinforcing plate; 28. Buffer spring; 29. ​​Moving column; 30. Insert pin; 31. Support frame; 32. Support rod; 33. Moving block; 34. Mounting frame; 35. Milling machine body; 36. Third mounting plate. Detailed Implementation

[0019] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0020] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0022] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-5 As shown, it illustrates a milling and turning composite machine tool according to an embodiment of the present disclosure, which includes a connecting box 1, a first fixing plate 2, an adjustment mechanism, a first connecting rail 10, a second fixing plate 11, a second connecting rail 12, a third fixing plate 13, an auxiliary mechanism, a third connecting rail 16, a fixing mechanism, and a support mechanism. like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the first fixing plate 2 is installed on the upper surface of the connecting box 1. The first connecting rail 10 is installed on the upper surface of the first fixing plate 2. The moving plate 9 slides along the first fixing plate 2, driving the second fixing plate 11 to move. The second fixing plate 11 slides along the first connecting rail 10. The adjustment mechanism is set inside the connecting box 1. The second fixing plate 11 is set above the adjustment mechanism. The first connecting rail 10 is slidably connected to the second fixing plate 11. The second connecting rail 12 is installed on the upper surface of the second fixing plate 11. The auxiliary mechanism is set on the upper surface of the second fixing plate 11. The third fixing plate 13 is slidably connected to the outside of the second connecting rail 12. The third connecting rail 16 is installed on the upper surface of the third fixing plate 13. The third connecting rail 16 and the first connecting rail 10 are both triangular slide rails. The fixing mechanism is installed on the upper surface of the third fixing plate 13. The support mechanism is installed on the upper surface of the third fixing plate 13.

[0026] like Figure 3As shown, the adjustment mechanism includes a connecting frame 3, a first drive motor 4, a threaded rod 5, a pulley 6, a belt 7, a threaded tube 8, and a movable plate 9. The connecting frame 3 is installed on the side of the connecting box 1, and the first drive motor 4 is installed on the side of the connecting frame 3. The threaded rod 5 is rotatably connected to the inside of the connecting box 1, and the right end of the threaded rod 5 extends out of the connecting box 1. This part is connected to the pulley 6. The end of the threaded rod 5 near the connecting frame 3 is connected to the pulley 6 via the belt 7. The first drive motor 4 can drive the two sets of threaded rods 5 through the pulley 6 and the belt 7, so that the movable plates 9 located on the front and rear sides can move to the left or right at the same time. The output end of the first drive motor 4 passes through the inside of the threaded rod 5 near the connecting frame 3. The threaded tube 8 is threaded onto the outer surface of the threaded rod 5, and the movable plate 9 is installed on the outer surface of the threaded tube 8. The movable plate 9 is slidably connected to the first fixed plate 2, and the upper surface of the movable plate 9 is installed on the lower surface of the second fixed plate 11.

[0027] like Figure 4 As shown, the auxiliary mechanism includes a push rod motor 14 and a moving frame 15. The push rod motor 14 is mounted on the upper surface of the second fixed plate 11. The output end of the push rod motor 14 moves forward and retracts. The forward movement of the output end of the push rod motor 14 drives the moving frame 15 to move forward. The forward movement of the moving frame 15 drives the third fixed plate 13 to move forward, thereby adjusting the processing position of the workpiece. The moving frame 15 is mounted on the output end of the push rod motor 14, and the inner side of the moving frame 15 is mounted inside the third fixed plate 13.

[0028] like Figure 4 As shown, the fixing mechanism includes a first mounting plate 17, a fixing pin 18, a support plate 19, a first reinforcing plate 20, a connecting shaft 21, a three-jaw chuck 22, and a second drive motor 23. The first mounting plate 17 is mounted on the upper surface of the third fixing plate 13 via the fixing pin 18. When the first mounting plate 17 is fixed, the fixing pin 18 abuts against the third fixing plate 13, but is not inserted into the interior of the third fixing plate 13. The first mounting plate 17 is slidably connected to the third connecting rail 16. The support plate 19 is mounted on the upper surface of the first mounting plate 17. The connecting shaft 21 is rotatably connected inside the support plate 19. The inner end of the connecting shaft 21 is equipped with a three-jaw chuck 22. The jaw chuck 22, also known as the three-jaw chuck 22, is a common type of chuck for fixing workpieces on the market. A first reinforcing plate 20 is installed on the outer side of the support plate 19. A second drive motor 23 is installed on the side of the support plate 19, which is located directly above the first drive motor 4. It should be noted that the connecting shaft 21 on the left is the driven shaft, and the connecting shaft 21 on the right is the driving shaft. That is to say, the second drive motor 23 first drives the connecting shaft 21 on the right to rotate, and then drives the connecting shaft 21 on the left to rotate through the workpiece. The output end of the second drive motor 23 passes through the connecting shaft 21, which is located directly above the first drive motor 4.

[0029] like Figure 5As shown, the support mechanism includes a second mounting plate 24, a connecting pin 25, a connecting pipe 26, a second reinforcing plate 27, a buffer spring 28, a moving column 29, a plug pin 30, a support frame 31, a support rod 32, and a moving block 33. The second mounting plate 24 is fixed to the upper surface of the third fixed plate 13 by the connecting pin 25. It should be noted that although the connecting pin 25 needs to be inserted into the third fixed plate 13 during the fixing of the second mounting plate 24, leaving a threaded hole on the upper surface of the third fixed plate 13, if the workpiece processed by this device does not require a separate support point, the first mounting plate 17 is inside the threaded hole; conversely, if a support point is required, the first mounting plate 17 is outside the threaded hole. Therefore, waste chips will not clog or enter the threaded hole during the workpiece processing. The connecting pipe 26 is installed on the upper surface of the second mounting plate 24, and a buffer spring 28 is installed inside the connecting pipe 26. The function of the buffer spring 28 is to adjust the movement. At position 29, a second reinforcing plate 27 is installed on the outer surface of the connecting pipe 26. A movable column 29 is installed at the top of the buffer spring 28. The movable column 29 passes through the connecting pipe 26. Pulling out the plug pin 30 causes the buffer spring 28 to rebound, driving the movable column 29 to move upward along the connecting pipe 26. The upward movement of the movable column 29 causes the support frame 31 to move upward, and the support frame 31 moves upward to contact the workpiece. Then, the movable block 33 is rotated clockwise, causing the support rod 32 to move inward along the support frame 31, pushing the support frame 31 open. The support rod 32 supports the workpiece. Then, the plug pin 30 is manipulated to pass through the connecting pipe 26 and press against the movable column 29. The plug pin 30 passes through the outer surface of the connecting pipe 26, and one end of the plug pin 30 that passes into the connecting pipe 26 presses against the movable column 29. The support frame 31 is installed at the top of the movable column 29. The support rod 32 is threaded through the inside of the support frame 31, and the movable block 33 is installed at the bottom of the support rod 32.

[0030] This device is suitable for processing heavy workpieces. The workpiece is moved by the movement and adjustment of the first fixed plate 2, the second fixed plate 11 and the third fixed plate 13. The workpiece is rotated by the rotation of the fixing mechanism. The workpiece is cut by the rotation of the output end of the milling machine body 35. The support mechanism set in the device provides multi-point support for the workpiece, thereby reducing the vibration generated during the processing of the workpiece and improving the stability of the device.

[0031] In this embodiment, as Figure 2As shown, a mounting bracket 34 is bolted to the outer side of the connecting box 1. A third mounting plate 36 is bolted to the upper surface of the mounting bracket 34. A milling machine body 35 is mounted on the upper surface of the third mounting plate 36. The milling machine body 35 is a common milling machine on the market. Since this device is a composite machine tool, the third mounting plate 36 and the mounting bracket 34 are connected by bolts, which makes it convenient for operators to replace the milling machine body 35 at any time to meet different processing needs. The power head of the milling machine body 35 is divided into a vertical milling power head and a horizontal milling power head. The horizontal milling power head is composed of a servo motor, a turret, and a gear transmission mechanism. The horizontal milling power head can realize functions such as boring, milling, and drilling. When the horizontal milling power head is connected to the mounting bracket 24, the lead screw lifting table in the prior art needs to be fixed to the mounting bracket 24 by bolts first, and then the horizontal milling power head is fixed to the connecting plate of the lead screw lifting table by bolts, so that the lead screw lifting table can assist the horizontal milling power head to move up and down.

[0032] It should be noted that all the electrical devices mentioned above are connected to an external individual control switch and require an external power source for power supply.

[0033] In this embodiment, the milling machine body 35 is fixed to the mounting frame 34 via the third mounting plate 36 and bolts. When an independent support point is required, the second mounting plate 24 is placed on the upper surface of the third fixed plate 13, and the connecting pin 25 is inserted into the third fixed plate 13 through the second mounting plate 24 and tightened clockwise. The workpiece is moved above the support frame 31, and the fixing pin 18 is loosened counterclockwise. The first mounting plate 17 is moved inward along the third connecting rail 16. The inward movement of the first mounting plate 17 drives the support plate 19 to move inward, and the inward movement of the support plate 19 drives the connecting shaft 21. Move inward, the connecting shaft 21 moves inward, driving the three-jaw chuck 22 to move inward, opening the three-jaw chuck 22, inserting the workpiece into the three-jaw chuck 22 and fixing it, pulling out the plug pin 30, causing the buffer spring 28 to rebound and drive the moving column 29 to move upward along the inside of the connecting tube 26, the moving column 29 moving upward drives the support frame 31 to move upward, the support frame 31 moving upward and contacting the workpiece, rotating the moving block 33 clockwise, causing the support rod 32 to move inward along the support frame 31 and push the support frame 31 open, manipulating the plug pin 30 to pass through the connecting tube 26 and press against the moving column 29; The second drive motor 23 is started. The output end of the second drive motor 23 rotates, which drives the three-jaw chuck 22 to rotate via the connecting shaft 21. The rotation of the three-jaw chuck 22 drives the workpiece to rotate, causing the workpiece to rotate along the support rod 32. During this process, the external cutting fluid continuously cools and lubricates the workpiece machining area. The first drive motor 4 is started. The output end of the first drive motor 4 rotates, which drives the pulley 6 to rotate via the belt 7. The rotation of the pulley 6 drives the threaded rod 5 to rotate. The rotation of the threaded rod 5 drives the threaded tube 8 to move to the left. The leftward movement of the threaded tube 8 drives the moving plate 9 to move to the left. The moving plate 9 moves to the left along the first fixed plate 2. The leftward movement of the moving plate 9 drives the second fixed plate 11 to move to the left. The second fixed plate 11 moves to the left along the first connecting rail 10, adjusting the workpiece to the left. Start the push rod motor 14. The output end of the push rod motor 14 moves forward, driving the moving frame 15 to move forward. The moving frame 15 moves forward, driving the third fixed plate 13 to move forward. The third fixed plate 13 moves forward along the second connecting rail 12, adjusting the workpiece forward. Then, the workpiece is processed by the tool at the output end of the milling machine body 35.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A milling and turning composite machine tool, comprising a connecting box (1), characterized in that, Also includes: The first fixing plate (2) is installed on the upper surface of the connecting box (1), and the first connecting rail (10) is installed on the upper surface of the first fixing plate (2). An adjustment mechanism is provided inside the connecting box (1); The second fixing plate (11) is disposed above the adjustment mechanism. The first connecting rail (10) is slidably connected to the second fixing plate (11). The second connecting rail (12) is installed on the upper surface of the second fixing plate (11). An auxiliary mechanism is disposed on the upper surface of the second fixing plate (11); The third fixing plate (13) is slidably connected to the outside of the second connecting rail (12), and the third connecting rail (16) is installed on the upper surface of the third fixing plate (13). A fixing mechanism is installed on the upper surface of the third fixing plate (13); A support mechanism is installed on the upper surface of the third fixing plate (13).

2. The milling and turning composite machine tool according to claim 1, characterized in that, The adjustment mechanism includes: A connecting frame (3) is installed on the side of the connecting box (1), and a first drive motor (4) is installed on the side of the connecting frame (3). A threaded rod (5) is rotatably connected inside the connecting box (1). One end of the threaded rod (5) near the connecting frame (3) is connected to a pulley (6) via a belt (7). The output end of the first drive motor (4) passes through the inside of the threaded rod (5) near the connecting frame (3). A threaded tube (8) is threaded onto the outer surface of the threaded rod (5), and a movable plate (9) is installed on the outer surface of the threaded tube (8).

3. A turning-milling composite machine tool according to claim 2, characterized in that, The movable plate (9) is slidably connected inside the first fixed plate (2), and the upper surface of the movable plate (9) is mounted on the lower surface of the second fixed plate (11).

4. A turning-milling composite machine tool according to claim 1, characterized in that, The auxiliary mechanism includes: A push rod motor (14) is mounted on the upper surface of the second fixing plate (11); A movable frame (15) is mounted on the output end of the push rod motor (14).

5. A turning-milling composite machine tool according to claim 4, characterized in that, The inner side of the movable frame (15) is installed inside the third fixed plate (13).

6. A turning-milling composite machine tool according to claim 2, characterized in that, The fixing mechanism includes: The first mounting plate (17) is mounted on the upper surface of the third fixing plate (13) by means of a fixing pin (18), and the first mounting plate (17) is slidably connected to the third connecting rail (16). A support plate (19) is mounted on the upper surface of the first mounting plate (17). A connecting shaft (21) is rotatably connected inside the support plate (19), and a three-jaw chuck (22) is installed at the inner end of the connecting shaft (21).

7. A turning-milling composite machine tool according to claim 6, characterized in that, A first reinforcing plate (20) is installed on the outer side of the support plate (19), and a second transmission motor (23) is installed on the side of the support plate (19) near the first transmission motor (4). The output end of the second transmission motor (23) passes through the connecting shaft (21) near the first transmission motor (4).

8. A turning-milling composite machine tool according to claim 1, characterized in that, The supporting structure includes: The second mounting plate (24) is fixed to the upper surface of the third fixing plate (13) by a connecting pin (25); A connecting pipe (26) is installed on the upper surface of the second mounting plate (24). A buffer spring (28) is installed inside the connecting pipe (26). A second reinforcing plate (27) is installed on the outer surface of the connecting pipe (26). A movable column (29) is installed at the top of the buffer spring (28). The movable column (29) passes through the connecting pipe (26). A plug pin (30) is inserted through the outer surface of the connecting tube (26), and one end of the plug pin (30) inserted into the connecting tube (26) abuts against the movable column (29). A support frame (31) is installed at the top of the movable column (29). A support rod (32) is threaded through the inside of the support frame (31). A movable block (33) is installed at the bottom of the support rod (32).

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