A loading machine rocker arm upper pin oil injection structure

Abstract

The utility model relates to loader transmission component lubricating technical field provides a kind of loader is used to shake arm upper pin place oil injection structure, and upper pin shaft end part is provided with connecting plate, connecting plate is connected in the outside of the upper end of rocker arm by fixed bolt, oil injection structure includes lubricating oil pipe and the lubricating fitting of threaded setting in upper pin shaft top, lubricating fitting top is threadedly set connecting bolt, first oil passage that is communicated with lubricating fitting is set in connecting bolt, connecting bolt is equipped with connector, second oil passage that is communicated with first oil passage is set in connector, second oil passage is also connected lubricating oil pipe, lubricating oil pipe is set in rocker arm along rocker arm outside downwards, and is set in rocker arm by pipe clamp, the end of lubricating oil pipe away from upper pin shaft is set hydraulic oil cup;Oil injection port is transferred from high position upper pin shaft to low position operating area, and operator can complete oil injection without climbing, reduce labour intensity and security risk, improve oil injection efficiency simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of lubrication technology for loader transmission components, and in particular to an oil injection structure for the upper pin of a loader rocker arm. Background Technology

[0002] The rocker arm upper pin is a key connecting component of the linkage mechanism of a large-tonnage loader, directly undertaking the core role of "transmitting power and realizing bucket movement". When the loader is operating, the rocker arm rotates and swings frequently under the action of the rotating cylinder. Regularly lubricating the pin shaft is a guarantee for the long-term operation of the equipment. In the linkage mechanism of large-tonnage loaders, the height of the rocker arm upper pin is relatively high. The current conventional manual oil injection method has the following problems: the straight-through hydraulic oil cup is directly fixed to the pin shaft, resulting in excessive height and making oil injection inconvenient. Operators need to use climbing tools to complete the oil injection operation, which not only increases the labor intensity of oil injection, but also poses safety hazards for working at height. In addition, the oil injection efficiency is low and it is difficult to meet the needs of rapid maintenance.

[0003] Therefore, in order to address the above problems, an oil injection structure for the upper pin of the loader arm is proposed to solve the problems. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by developing an oil injection structure for the upper pin of a loader's rocker arm. This invention facilitates oil injection without requiring climbing, reducing labor intensity and safety hazards, while also improving oil injection efficiency.

[0005] The technical solution to the technical problem solved by this utility model is as follows: This utility model provides an oil injection structure for the upper pin of a loader rocker arm. A connecting plate is provided at the end of the upper pin shaft. The connecting plate is connected to the outer side of the upper end of the rocker arm by a fixing bolt. The oil injection structure includes a lubricating oil pipe and a lubricating joint threaded on the top of the upper pin shaft. A connecting bolt is threaded on the top of the lubricating joint. A first oil passage communicating with the lubricating joint is provided inside the connecting bolt. A connecting head is provided outside the connecting bolt. A second oil passage communicating with the first oil passage is provided inside the connecting head. The second oil passage is also connected to the lubricating oil pipe. The lubricating oil pipe is arranged downward along the outer side of the rocker arm and is set on the rocker arm by a pipe clamp. A hydraulic oil cup is provided at the end of the lubricating oil pipe away from the upper pin shaft.

[0006] As an optimization, the lubricating oil pipe includes a first connecting part located above the connecting plate, with its left end connected to the connector and its right end provided with a second connecting part. The second connecting part is inclined downward, with the right end of the connecting plate located below the second connecting part. A third connecting part is provided at the right end of the second connecting part, with the third connecting part facing away from the upper pin.

[0007] As an optimization, the first connecting part includes a first oil pipe and a second oil pipe arranged parallel to the outer side of the rocker arm in sequence. The left end of the first oil pipe is connected to the second oil passage of the connector, and the right end is located behind the fixing bolt and connected to the left end of the second oil pipe. The right end of the second oil pipe is connected to the second connecting part.

[0008] As an optimization, the second connection part includes a third oil pipe, which is inclined downwards, with its left end connected to the second oil pipe and its right end connected to the third connection part. The top surface of the fixing bolt is lower than the left end of the third oil pipe, and the top surface of the connecting plate is higher than the right end of the third oil pipe.

[0009] As an optimization, the third connection part includes a fourth oil pipe and a fifth oil pipe arranged in sequence. The fourth oil pipe is parallel to the outer side of the rocker arm and is mounted on the rocker arm by a pipe clamp. Its left end is connected to the third oil pipe. The fifth oil pipe is inclined upward, with its left end lower than its right end. A hydraulic oil cup is set at the right end, and a dust cap is set on the hydraulic oil cup.

[0010] As an optimization, a protective plate is provided on the outer edge of the rocker arm. The protective plate includes an interconnected arc plate and a flat plate. The arc plate is located outside the connecting plate, and the center of the arc plate's cross section is the same as the center of the upper pin's cross section. The flat plate is parallel to the outer edge of the rocker arm, and the second, third, fourth, and fifth oil pipes are all parallel to the side of the flat plate.

[0011] As an optimization, the height of the guard plate is higher than the top surface height of the connecting bolt, the length of the flat plate is greater than the vertical distance between the left and right end faces of the lubricating oil pipe, and the distance between the flat plate and the lubricating oil pipe is greater than 4 cm.

[0012] As an optimization, the connecting bolt includes a bolt head, and a first connecting shaft, a second connecting shaft, and a third connecting shaft are sequentially connected at the bottom of the bolt head. The first connecting shaft and the third connecting shaft have the same shaft diameter, and both are larger than the shaft diameter of the second connecting shaft. The bottom of the third connecting shaft is provided with an external thread. The top of the lubrication joint is threadedly connected to the third connecting shaft. A through hole adapted to the first connecting shaft and the third connecting shaft is vertically opened inside the connector. Washers are provided between the connector and the bolt head and between the connector and the lubrication joint.

[0013] As an optimization, a non-penetrating oil passage is opened in the second connecting shaft, and a vertical oil passage is opened through the third connecting shaft axially. One end of the non-penetrating oil passage is opened radially along the second connecting shaft, and the other end passes through the bottom of the second connecting shaft and connects with the vertical oil passage to form the first oil passage. A second oil passage is opened radially along the second connecting shaft on one side of the connector. The second oil passage is connected with the through hole. An installation step is set in the second oil passage. The left end of the lubricating oil pipe is fixed at the installation step. The orthographic projection of the second oil passage falls on the second connecting shaft, so that the lubricating oil flows into the non-penetrating oil passage through the second oil passage and then into the vertical oil passage.

[0014] As an optimization, when the upper part of the connector is connected to the first connecting shaft and the lower part is connected to the third connecting shaft, the orthographic projection of the second oil passage falls on the second connecting shaft, so that the lubricating oil flows into the non-penetrating oil passage through the second oil passage and then into the vertical oil passage.

[0015] As an optimization, the lubrication joint includes a first connecting seat and a second connecting seat arranged in sequence. The first and second connecting seats have hollow oil passages inside. The top of the first connecting seat is threaded to the bottom of the connecting bolt. The first connecting seat has two mounting positions symmetrically opened along the axis. The outer wall of the second connecting seat is provided with external threads and threaded to the upper pin.

[0016] The effects provided in the utility model description are merely those of the embodiments, and not all the effects of the utility model. The above technical solution has the following advantages or beneficial effects: 1. By extending the multi-section lubrication pipe, the oil injection port is moved from the high position of the upper pin to the low position of the operating area, so that the operator can complete the oil injection without climbing, reducing labor intensity and safety hazards, while improving the oil injection efficiency. 2. The guard plate provides comprehensive protection for components such as the lubrication joint, connecting bolts, and lubrication oil pipe at the rocker arm pin, effectively blocking the impact of scattered materials, reducing the probability of damage to the lubrication structure, and lowering equipment maintenance and operating costs; 3. The routing of the lubricating oil pipe is adapted to the shape of the rocker arm, and the arc plate of the guard plate is coaxial with the upper pin shaft to fit the component structure. The overall structure is easy to install and does not require major modifications to the existing rocker arm structure of the loader, making it highly adaptable. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a connection structure diagram of the lubrication joint of this utility model; Figure 3 This is a structural diagram of the lubricating oil pipe of this utility model; Figure 4 This utility model Figure 1 Enlarged view of point A in the middle; Figure 5 This utility model Figure 1 Enlarged view at point B in the middle; Figure 6 This is a structural diagram of the connector of this utility model; Figure 7 This is a structural diagram of the connecting bolt of this utility model.

[0019] In the diagram: 1. Upper pin; 2. Lubrication connector; 201. First connecting seat; 2011. Mounting position; 202. Second connecting seat; 3. Connecting bolt; 301. Bolt head; 302. First connecting shaft; 303. Second connecting shaft; 304. Third connecting shaft; 3031. Non-penetrating oil passage; 3041. Vertical oil passage; 4. Connector; 401. Through hole; 4011. Mounting step; 5. Lubricating oil pipe; 501. Second oil pipe; 502. Third oil pipe; 503. Fourth oil pipe; 504. Fifth oil pipe; 505. First oil pipe; 6. Pipe clamp; 7. Rocker arm; 8. Hydraulic oil cup; 9. Washer; 10. Protective plate; 1001. Arc plate; 1002. Flat plate; 11. Cross-grooved pan head bolt; 12. Class A flat washer; 13. Oil cup dust cap; 14. Connecting plate; 15. Fixing bolt. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. The present invention omits descriptions of well-known components and processing techniques and processes to avoid unnecessarily limiting the present invention. The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figures 1 to 7As shown, a loader rocker arm upper pin oiling structure is provided. A connecting plate 14 is provided at the end of the upper pin 1. The connecting plate 14 is connected to the outer side of the upper end of the rocker arm 7 by a fixing bolt 15. The oiling structure includes a lubricating oil pipe 5 and a lubricating connector 2 threaded on the top of the upper pin 1. A connecting bolt 3 is threaded on the top of the lubricating connector 2. A first oil passage communicating with the lubricating connector 2 is provided inside the connecting bolt 3. A connecting head 4 is sleeved on the connecting bolt 3. A second oil passage communicating with the first oil passage is provided inside the connecting head 4. The second oil passage is also connected to the lubricating oil pipe 5. The lubricating oil pipe 5 is arranged downwards along the outer side of the rocker arm 7 and is mounted on the rocker arm 7 by a pipe clamp 6. A hydraulic oil cup 8 is provided at the end of the lubricating oil pipe 5 away from the upper pin 1. Through the oil passage connection structure of lubricating oil pipe 5-connecting head 4-connecting bolt 3-lubricating connector 2, precise delivery of lubricating oil from the outside to the upper pin of the rocker arm is achieved. At the same time, by utilizing the extended layout of the lubricating oil pipe, the oiling port can be moved to a lower position, solving the problem of inconvenience in high-position oiling.

[0022] In this embodiment, the lubricating oil pipe 5 includes a first connecting part, which is located above the connecting plate 14. Its left end is connected to the connector 4, and its right end is provided with a second connecting part. The second connecting part is inclined downward. The right end of the connecting plate 14 is located below the second connecting part. The right end of the second connecting part is provided with a third connecting part, which faces the end away from the upper pin 1.

[0023] The first connecting part includes a first oil pipe 505 and a second oil pipe 501 arranged parallel to the outer side of the rocker arm 7. The left end of the first oil pipe 505 is connected to the second oil passage of the connector 4, and the right end is located behind the fixing bolt 15 and connected to the left end of the second oil pipe 501. The right end of the second oil pipe 501 is connected to the second connecting part.

[0024] The second connecting part includes a third oil pipe 502, which is inclined downward. The left end of the third oil pipe 502 is connected to the second oil pipe 501, and the right end is connected to the third connecting part. The top surface of the fixing bolt 15 is lower than the left end of the third oil pipe 502, and the top surface of the connecting plate 14 is higher than the right end of the third oil pipe 502.

[0025] The third connecting part includes a fourth oil pipe 503 and a fifth oil pipe 504 arranged in sequence. The fourth oil pipe 503 is parallel to the outer side of the rocker arm 7 and is mounted on the rocker arm 7 by a pipe clamp 6. Its left end is connected to the third oil pipe 502. The fifth oil pipe 504 is inclined upward, with its left end lower than its right end. A hydraulic oil cup 8 is set at the right end, and an oil cup dust cap 13 is set on the hydraulic oil cup 8. The hydraulic oil cup 8 serves as an oil filling port and is located at the end of the fifth oil pipe 504 at a low position. Operators can complete the oil filling without climbing, which greatly improves the convenience of operation. The hydraulic oil cup 8 is a straight-through hydraulic oil cup. The multi-segment oil pipe layout combined with the "parallel-inclined-parallel-inclined" routing design can flexibly adapt to the shape and structure of the rocker arm 7, and transfer the oil injection port from the upper pin 1 at a high position to the operating area at a low position; at the same time, the pipe clamp 6 is also equipped with a cross-grooved pan head bolt 11 and a Class A flat washer 12 to stably fix the fourth oil pipe 503 on the rocker arm 7, which can prevent the oil pipe from shifting or being damaged due to the vibration of the loader.

[0026] In this embodiment, a protective plate 10 is provided on the outer edge of the rocker arm 7. The protective plate 10 includes an arc-shaped plate 1001 and a flat plate 1002 connected to each other. The arc-shaped plate 1001 is located outside the connecting plate 14, and the center of the cross-section of the arc-shaped plate 1001 is the same as the center of the cross-section of the upper pin 1. The flat plate 1002 is parallel to the outer edge of the rocker arm 7, and the second oil pipe 501, the third oil pipe 502, the fourth oil pipe 503, and the fifth oil pipe 504 are all parallel to the side of the flat plate 1002. The coaxial design of the arc-shaped plate 1001 and the upper pin 1 can form a wrap-around protection for the top and surrounding components of the circular upper pin 1, such as the lubrication joint 2 and the connecting bolt 3, preventing direct impact from materials spilled from behind the bucket. The flat plate 1002 can extend the protection range, covering the lubrication oil pipe 5 at the top edge of the rocker arm 7, further protecting the lubrication structure from material impact.

[0027] The height of the guard plate 10 is higher than the top surface height of the connecting bolt 3, the length of the flat plate 1002 is greater than the vertical distance between the left and right end faces of the lubricating oil pipe 5, and the distance between the flat plate 1002 and the lubricating oil pipe 5 is greater than 4 cm.

[0028] In this embodiment, the connecting bolt 3 includes a bolt head 301. A first connecting shaft 302, a second connecting shaft 303, and a third connecting shaft 304 are sequentially connected at the bottom of the bolt head 301. The first connecting shaft 302 and the third connecting shaft 304 have the same shaft diameter, and both are larger than the shaft diameter of the second connecting shaft 303. The bottom of the third connecting shaft 304 is provided with an external thread. The top of the lubrication connector 2 is threadedly connected to the third connecting shaft 304. A through hole 401, adapted to the first connecting shaft 302 and the third connecting shaft 304, is vertically opened inside the connector 4. Washers 9 are provided between the connector 4 and the bolt head 301, and between the connector 4 and the lubrication connector 2. The washers 9 ensure a tight fit between the connector 4 and the bolt head 301, and between the connector 4 and the lubrication connector 2, guaranteeing a seal, preventing lubricating oil leakage from the connection gap, ensuring sufficient lubrication at the upper pin 1, and extending the service life of the upper pin 1 of the rocker arm 7. The stepped shaft design allows the third connecting shaft 304 to be screwed into the top of the lubrication joint 2, and the washer 9 and the connector 4 to be pressed together continuously. The small-diameter structure of the second connecting shaft 303 leaves space for oil passages, while the third connecting shaft 304 can penetrate deep into the lubrication joint 2 to ensure the sealing of the oil passage connection.

[0029] A non-penetrating oil passage 3031 is formed inside the second connecting shaft 303, and a vertical oil passage 3041 is formed through the third connecting shaft 304 axially. One end of the non-penetrating oil passage 3031 is radially formed along the second connecting shaft 303, and the other end passes through the bottom of the second connecting shaft 303 and connects with the vertical oil passage 3041 to form a first oil passage. A second oil passage is formed on one side of the connector 4 radially along the second connecting shaft 303. The second oil passage connects with the through hole 401. An installation step 4011 is provided inside the second oil passage. The left end of the lubricating oil pipe 5 is fixed at the installation step 4011. The orthographic projection of the second oil passage falls on the second connecting shaft 303, so that the lubricating oil flows into the non-penetrating oil passage 3031 through the second oil passage, and then into the vertical oil passage 3041. The lubricating oil can enter the second oil passage of the connector 4 from the first oil passage of the connecting bolt 3, then enter the lubrication joint 2, and finally enter the lubrication part of the upper pin 1, forming a continuous lubricating oil delivery path.

[0030] The lubrication connector 2 includes a first connecting seat 201 and a second connecting seat 202 arranged sequentially. Both the first and second connecting seats 201 and 202 have hollow oil passages. The top of the first connecting seat 201 is threaded to the bottom of the connecting bolt 3. The first connecting seat 201 has two symmetrical mounting positions 2011 along its axis. The outer wall of the second connecting seat 202 has external threads that are threaded to the upper pin 1. The mounting positions 2011 facilitate the installation of the lubrication connector 2 onto the upper pin 1 using a wrench.

[0031] Although the specific embodiments of the utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the utility model. Based on the technical solution of the utility model, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the utility model.

Claims

1. A structure for oiling the upper pin of a rocker arm of a loader, wherein a connecting plate (14) is provided at the end of an upper pin shaft (1), and the connecting plate (14) is connected to the outer side of the upper end of a rocker arm (7) by a fixing bolt (15), characterized in that: The oil filling structure includes a lubricating oil pipe (5) and a lubricating connector (2) with threads set on the top of the upper pin (1). A connecting bolt (3) is threaded on the top of the lubricating connector (2). A first oil passage communicating with the lubricating connector (2) is set inside the connecting bolt (3). A connector (4) is fitted over the connecting bolt (3). A second oil passage communicating with the first oil passage is set inside the connector (4). The second oil passage is also connected to the lubricating oil pipe (5). The lubricating oil pipe (5) is set downward along the outer side of the rocker arm (7) and is set on the rocker arm (7) through a pipe clamp (6). A hydraulic oil cup (8) is set at the end of the lubricating oil pipe (5) away from the upper pin (1).

2. The oil injection structure at the upper pin of the loader rocker arm according to claim 1, characterized in that: The lubricating oil pipe (5) includes a first connecting part, which is located above the connecting plate (14). Its left end is connected to the connector (4), and its right end is provided with a second connecting part. The second connecting part is inclined downward. The right end of the connecting plate (14) is located below the second connecting part. The right end of the second connecting part is provided with a third connecting part, which faces away from the upper pin (1).

3. The oil injection structure at the upper pin of the loader rocker arm according to claim 2, characterized in that: The first connecting part includes a first oil pipe (505) and a second oil pipe (501) arranged parallel to the outer side of the rocker arm (7). The left end of the first oil pipe (505) is connected to the second oil passage of the connector (4), and the right end is located behind the fixing bolt (15) and connected to the left end of the second oil pipe (501). The right end of the second oil pipe (501) is connected to the second connecting part.

4. The oil injection structure at the upper pin of the loader rocker arm according to claim 3, characterized in that: The second connection part includes a third oil pipe (502), which is inclined downward. The left end is connected to the second oil pipe (501), and the right end is connected to the third connection part. The top surface of the fixing bolt (15) is lower than the left end of the third oil pipe (502), and the top surface of the connecting plate (14) is higher than the right end of the third oil pipe (502).

5. The oil injection structure at the upper pin of the loader rocker arm according to claim 4, characterized in that: The third connection part includes a fourth oil pipe (503) and a fifth oil pipe (504) arranged in sequence. The fourth oil pipe (503) is parallel to the outer side of the rocker arm (7) and is set on the rocker arm (7) by a pipe clamp (6). Its left end is connected to the third oil pipe (502). The fifth oil pipe (504) is set at an angle upward, with its left end lower than its right end. A hydraulic oil cup (8) is set on the right end, and an oil cup dust cap (13) is set on the hydraulic oil cup (8).

6. The oil injection structure at the upper pin of the loader rocker arm according to claim 5, characterized in that: A guard plate (10) is provided on the outer edge of the rocker arm (7). The guard plate (10) includes an arc plate (1001) and a flat plate (1002) connected to each other. The arc plate (1001) is located outside the connecting plate (14), and the center of the cross section of the arc plate (1001) is the same as the center of the cross section of the upper pin (1). The flat plate (1002) is parallel to the outer edge of the rocker arm (7), and the second oil pipe (501), the third oil pipe (502), the fourth oil pipe (503) and the fifth oil pipe (504) are all parallel to the side of the flat plate (1002).

7. The oil injection structure at the upper pin of the loader rocker arm according to claim 6, characterized in that: The height of the guard plate (10) is higher than the top surface height of the connecting bolt (3), the length of the flat plate (1002) is greater than the vertical distance between the left and right ends of the lubricating oil pipe (5), and the distance between the flat plate (1002) and the lubricating oil pipe (5) is greater than 4 cm.

8. The oil injection structure at the upper pin of the loader rocker arm according to any one of claims 1-7, characterized in that: The connecting bolt (3) includes a bolt head (301). The bottom of the bolt head (301) is provided with a first connecting shaft (302), a second connecting shaft (303) and a third connecting shaft (304) connected in sequence. The first connecting shaft (302) and the third connecting shaft (304) have the same shaft diameter and are both larger than the shaft diameter of the second connecting shaft (303). The bottom of the third connecting shaft (304) is provided with an external thread. The top of the lubrication connector (2) is threaded to the third connecting shaft (304). The connector (4) has a through hole (401) that is adapted to the first connecting shaft (302) and the third connecting shaft (304) in a vertical direction. Washers (9) are provided between the connector (4) and the bolt head (301) and between the connector (4) and the lubrication connector (2).

9. The oil injection structure at the upper pin of the loader rocker arm according to claim 8, characterized in that: A non-penetrating oil passage (3031) is opened inside the second connecting shaft (303), and a vertical oil passage (3041) is opened through the third connecting shaft (304) axially. One end of the non-penetrating oil passage (3031) is opened radially along the second connecting shaft (303), and the other end passes through the bottom of the second connecting shaft (303) and connects with the vertical oil passage (3041) to form the first oil passage. A second oil passage is opened radially along the second connecting shaft (303) on one side of the connector (4). The second oil passage is connected with the through hole (401). An installation step (4011) is set inside the second oil passage. The left end of the lubricating oil pipe (5) is fixed at the installation step (4011). The orthographic projection of the second oil passage falls on the second connecting shaft (303), so that the lubricating oil flows into the non-penetrating oil passage (3031) through the second oil passage and then flows into the vertical oil passage (3041).

10. The oil injection structure at the upper pin of the loader rocker arm according to any one of claims 1-7, characterized in that: The lubrication joint (2) includes a first connecting seat (201) and a second connecting seat (202) arranged in sequence. The first connecting seat (201) and the second connecting seat (202) are hollow oil passages. The top of the first connecting seat (201) is threaded to the bottom of the connecting bolt (3). The first connecting seat (201) has two mounting positions (2011) symmetrically opened along the axis. The outer wall of the second connecting seat (202) is provided with external threads and threaded to the upper pin (1).

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