A high-strength pin and a process for manufacturing the same

Abstract

The present invention relates to the technical field of pin processing, specifically to a high-strength pin and a process for making the pin, comprising: a pin body, a cavity is provided at the inner end of the pin body, a threaded hole is provided at the upper end of the pin body, a rotating groove is provided at the lower end, a movable hole 1 is symmetrically provided on the side walls on both sides of the lower end of the pin body, and a through hole is symmetrically provided on the left and right sides of the upper end, the inner ports of the through hole and the movable hole 1 are connected to the inner end of the cavity, the upper end of the cavity is connected to the lower end of the threaded hole, the lower end of the cavity is connected to the upper end of the rotating groove, a piston is movably installed in the cavity, and the outer end side wall of the piston is in contact with the inner end side wall of the cavity; by rotating the rotating rod to allow the threaded sleeve to move on the rotating rod, the lower end of the driving rod can be driven upward, and the upper end of the driving rod moves the driving rod to one side of the movable hole 2 and passes through the outer side of the movable hole 2 to limit the pin.

Description

Technical Field

[0001] The invention relates to the technical field of pin processing, in particular to a high-strength pin and a process for manufacturing the pin. Background Art

[0002] Pins are a standardized type of fastener that can provide both static fixation and relative motion to the connected parts. They are primarily used at the hinge joint between two parts to create a hinge connection. Pins are typically locked with a cotter pin, ensuring reliable operation and easy removal.

[0003] Chinese patent CN110508998A discloses a removable pin, comprising: a cylindrical pin body, an axial through hole, a radial through hole group, and a terminal through hole located within the pin body, and an axial groove group located on the cylindrical surface of the pin body; the radial through hole group includes two or more radial through holes, and the axial groove group includes two or more axial grooves, one end of the radial through hole communicates with the axial through hole, and the other end communicates with the axial groove; the axial through hole is used to accommodate a heating device or circulate coolant; the radial through hole group and the axial groove group are used to circulate coolant; the terminal through hole is connected to the end of the axial through hole and is detachably connected to a blocking mechanism for blocking coolant. The use of the aforementioned removable pin can prevent damage to structural components during disassembly and greatly reduce the workload of workers removing rusted pins.

[0004] However, the pin is subjected to a large lateral shear force when in use, and the pin is prone to breakage. At the same time, when the pin is used to connect two objects, the pin body lacks a limit, and the connection between the two objects is unstable and prone to falling off. Summary of the Invention

[0005] The object of the present invention is to provide a high-strength pin and a process for manufacturing the pin to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a high-strength pin, comprising: a pin body, wherein a cavity is formed at the inner end of the pin body, a threaded hole is formed at the upper end of the pin body, a rotation groove is formed at the lower end, movable holes 1 are symmetrically formed on the left and right side walls of the lower end of the pin body, and through holes are symmetrically formed on the left and right sides of the upper end, the inner ends of the through holes and the movable holes 1 are connected to the inner end of the cavity, the upper end of the cavity is connected to the lower end of the threaded hole, the lower end of the cavity is connected to the upper end of the rotation groove, a piston is movably installed in the cavity, and the outer end side wall of the piston is in contact with the inner end side wall of the cavity;

[0007] A rotating rod is rotatably connected in the cavity, a threaded sleeve is threadedly connected on the outer wall of the rotating rod, and both left and right ends of the threaded sleeve are rotatably connected to a driving rod, one end of the driving rod is rotatably connected to an insertion rod, and the other end of the insertion rod is located in the movable hole;

[0008] A reinforcing tube is sleeved on the outer wall of the pin body, and a number of reinforcing strips are evenly fixed on the outer side wall of the reinforcing tube. The outer end of the reinforcing strip is provided with a wear-resistant layer, and the lower end of the wear-resistant layer is threadedly connected to the lower end outer wall of the pin body through a threaded tube.

[0009] Preferably, the threaded hole is convex, a sealing cover is connected to the threaded hole, a sealing gasket is fixedly installed on the lower side wall of the sealing cover, and when the sealing cover is threaded in the threaded hole, the lower end of the sealing gasket is tightly connected to the upper inner wall of the threaded hole.

[0010] Preferably, a connecting groove is provided on the outer wall of the upper end of the pin shaft body, and the connecting groove is located at the upper end of the movable hole 1. The reinforcing tube is sleeved on the outside of the connecting groove and welded. Through holes are symmetrically provided on the left and right sides of the upper end of the reinforcing tube, and the through holes are located between two adjacent reinforcing strips.

[0011] Preferably, a threaded groove is provided on the outer wall of the lower end of the pin shaft body, a threaded cylinder is fixedly installed on the inner wall of the lower end of the wear-resistant layer, a rubber pad is fixedly installed on the side wall of the upper end of the wear-resistant layer, an annular oil outlet ring and a plurality of strip-shaped oil guide grooves are provided on the outer wall of the upper end of the wear-resistant layer, the upper end of the oil guide groove is connected with the oil outlet ring, two through holes are symmetrically provided at the inner end of the oil outlet ring, and two movable holes 2 are symmetrically provided on the side walls on the left and right sides of the lower end of the wear-resistant layer. After the wear-resistant layer is installed, the wear-resistant layer, the reinforcing cylinder and the through hole at the upper end of the pin shaft body are connected to form an oil channel, the oil outlet pipe is inserted into the oil channel and fixed by an adhesive layer, and the movable hole 2 is located just outside the movable hole 1.

[0012] Preferably, a driving head is rotatably connected in the rotating groove, a hexagonal groove is provided on the outer wall of the lower end of the driving head, the upper end of the driving head is fixedly connected to the lower end of the rotating rod, the lower end of the rotating rod is rotatably connected through a bearing and the inner wall of the pin body, a fixing plate is fixedly installed on the inner wall of the lower end of the cavity, the upper end of the rotating rod passes through the side wall of the fixing plate and is rotatably connected to the fixing plate through the bearing.

[0013] Preferably, the outer walls of the upper and lower ends of the rotating rod are provided with external threads, the outer wall of the lower end of the rotating rod is threadedly connected to the inner wall of the threaded sleeve through the external threads, and the left and right ends of the threaded sleeve are rotatably connected to one end of the driving rod through the ear plate.

[0014] Preferably, a spring is fixedly mounted on the outer wall of the upper end of the threaded sleeve, the spring is sleeved on the outer wall of the rotating rod, and the other end of the spring is fixedly mounted on the side wall of the fixed plate.

[0015] Preferably, the upper end of the rotating rod is threadedly connected to a long screw barrel through an external thread, and the upper end of the long screw barrel is fixedly connected to the center of the lower end side wall of the piston.

[0016] A manufacturing process for a high-strength pin specifically includes the following steps:

[0017] S1. First, a connecting groove is formed on the outer wall of the upper end of the pin body, a threaded groove is formed on the outer wall of the lower end of the lower pin body, a threaded hole is formed on the upper end of the pin body, a rotation groove is formed on the lower end, and a cavity is formed inside. A reinforcing tube is sleeved on the outside of the connecting groove and welded. Then, the wear-resistant layer is threadedly connected to the lower end of the pin body. At this time, the rubber pad on the upper end of the wear-resistant layer is in close contact with the outer wall of the upper end of the pin body.

[0018] S2. Then, through holes are symmetrically opened on the left and right sides of the upper end of the installed pin shaft, and movable hole 2 and movable hole 1 are symmetrically opened on the left and right side walls of the lower end;

[0019] S3. The threaded sleeve and the long screw barrel are respectively threadedly connected to the upper end of the rotating rod, and a piston is fixedly installed on the upper end of the long screw barrel. The rotating rod is rotated and connected in the cavity, and the outer wall of the piston contacts the inner wall of the cavity;

[0020] S4. Rotate and connect one end of the insertion rod to one end of the driving rod, then pass through the second movable hole and insert into the first movable hole. The inner end of the insertion rod is located in the cavity and the driving rod and the threaded sleeve are rotated and connected.

[0021] S5. Finally, inject lubricating oil into the cavity through the threaded hole, and then install a sealing cover in the threaded hole.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] By opening a connection groove on the outer wall of the upper end of the pin body, the reinforcement tube and the reinforcement strip are sleeved on the outer side of the connection groove and welded, the strength of the pin is increased;

[0024] By rotating the rotating rod to move the threaded sleeve on the rotating rod, the lower end of the driving rod can be driven upward, and the upper end of the driving rod moves the driving rod to the side of the second moving hole and passes through the outside of the second moving hole to limit the pin shaft;

[0025] By driving the long screw barrel to move upward, the long screw barrel drives the piston to move upward, squeezing the lubricating oil in the cavity from the oil outlet pipe to lubricate the pin shaft, thereby further increasing the service life of the pin shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a bottom view of the overall structure of the present invention;

[0027] Figure 2 It is a top view of the overall structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the reinforcement cylinder of the present invention being installed on the pin body;

[0029] Figure 4 This is a schematic top view of the pin body of the present invention;

[0030] Figure 5 It is a schematic cross-sectional view of the overall structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure on the rotating rod of the present invention;

[0032] Figure 7 For the present invention Figure 5 A magnified view of the structure of area A in the middle.

[0033] In the figure: 1. Pin body; 2. Rotating groove; 3. Threaded hole; 4. Connecting groove; 5. Through hole; 6. Moving hole 1; 7. Threaded groove; 8. Reinforcement cylinder; 9. Reinforcement strip; 10. Wear-resistant layer; 11. Rubber pad; 12. Driving groove; 13. Moving hole 2; 14. Threaded cylinder; 15. Oil outlet ring; 16. Oil guide groove; 18. Cavity; 19. Blocking cover; 20. Sealing gasket; 21. Driving head; 22. Rotating rod; 23. Long screw cylinder; 24. Piston; 25. Threaded sleeve; 26. Driving rod; 27. Insert rod; 28. Fixed plate; 29. ​​Spring; 30. Adhesive layer; 31. Oil outlet pipe. DETAILED DESCRIPTION

[0034] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "one," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] For the purpose of simplicity and illustration, the principles of the embodiments are described primarily with reference to examples. In the following description, many specific details are provided to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures are not described in detail to avoid unnecessarily obscuring the understanding of these embodiments. In addition, all embodiments may be used in combination with each other.

[0038] See also Figures 1 to 7 The present invention provides a technical solution: a high-strength pin shaft, comprising: a pin shaft body 1, a cavity 18 is provided at the inner end of the pin shaft body 1, a threaded hole 3 is provided at the upper end of the pin shaft body 1, and a rotation groove 2 is provided at the lower end. The threaded hole 3 is convex, and a sealing cover 19 is connected to the threaded hole 3 through a thread. A sealing gasket 20 is fixedly installed on the side wall of the lower end of the sealing cover 19, and a cross groove is provided on the side wall of the upper end of the sealing cover 19. When the sealing cover 19 is threadedly installed in the threaded hole 3, the lower end of the sealing gasket 20 is tightly connected to the inner wall of the upper end of the threaded hole 3, thereby sealing the threaded hole 3. By opening the sealing cover 19 on the threaded hole 3, the sealing gasket 20 can be fixedly installed on the side wall of the lower end of the sealing cover 19. Lubricating oil is added to the cavity 18, and movable holes 6 are symmetrically opened on the side walls on the left and right sides of the lower end of the pin body 1, and through holes 5 are symmetrically opened on the left and right sides of the upper end. The inner ports of the through hole 5 and the movable hole 6 are connected to the inner end of the cavity 18, the upper end of the cavity 18 is connected to the lower end of the threaded hole 3, and the lower end of the cavity 18 is connected to the upper end of the rotating groove 2. A piston 24 is movably installed in the cavity 18, and the outer end side wall of the piston 24 is in contact with the inner end side wall of the cavity 18. By pushing the piston 24 upward, the piston 24 can push the lubricating oil in the cavity 18 upward and flow out from the through hole 5 to lubricate the pin.

[0039] A reinforcing tube 8 is sleeved on the outer wall of the pin body 1, and a number of reinforcing strips 9 are evenly fixed on the outer end side wall of the reinforcing tube 8. A connecting groove 4 is provided on the outer wall of the upper end of the pin body 1. The connecting groove 4 is located at the upper end of the movable hole 6. The reinforcing tube 8 is sleeved on the outside of the connecting groove 4 and welded. Through holes 5 are symmetrically provided on the left and right sides of the upper end of the reinforcing tube 8. The through hole 5 is located between two adjacent reinforcing strips 9. The reinforcing tube 8 and the reinforcing strip 9 play a role in increasing the strength of the pin shaft to prevent the pin shaft from being broken by external force during use. The outer end of the reinforcing strip 9 is provided with a wear-resistant layer 10, and the lower end of the wear-resistant layer 10 is threadedly connected to the lower end outer wall of the pin shaft body 1 through a threaded tube 14. A threaded groove 7 is provided on the outer wall of the lower end of the pin shaft body 1, and a threaded tube 14 is fixedly installed on the inner wall of the lower end of the wear-resistant layer 10. A rubber pad 11 is fixedly installed on the upper end side wall of the wear-resistant layer 10. An annular oil outlet ring 15 and several strip-shaped oil guide grooves 16 are provided on the wall. The upper end of the oil guide groove 16 is connected to the oil outlet ring 15. Two through holes 5 are symmetrically provided at the inner end of the oil outlet ring 15. Two movable holes 2 13 are symmetrically provided on the side walls on the left and right sides of the lower end of the wear-resistant layer 10. After the wear-resistant layer 10 is installed, the wear-resistant layer 10, the reinforcement cylinder 8 and the through hole 5 at the upper end of the pin body 1 are connected to form an oil channel. An oil outlet pipe 31 is inserted into the oil channel and fixed by an adhesive layer 30. The lubricating oil can flow into the oil outlet ring 15 through the oil outlet pipe 31, and then quickly diffuse to the outside of the wear-resistant layer 10 through the oil guide groove 16. When the pin is in use, the wear-resistant layer 10 is lubricated, further increasing the service life of the wear-resistant layer 10. The movable hole 2 13 is located just outside the movable hole 1 6. The inner end side wall of the wear-resistant layer 10 is in contact with the outer end side wall of the reinforcement strip 9, thereby supporting the wear-resistant layer 10.

[0040] Six driving grooves 12 are evenly arranged on the side wall of the lower end of the wear-resistant layer 10. The six driving grooves 12 are combined into an equilateral hexagonal shape, which makes it easy to connect the lower end of the wear-resistant layer 10 with an inner hexagonal wrench to drive the wear-resistant layer 10 to rotate on the pin body 1.

[0041] A rotating rod 22 is rotatably connected in the cavity 18, and a driving head 21 is rotatably connected in the rotating groove 2. A hexagonal groove is provided on the outer wall of the lower end of the driving head 21. The lower end of the rotating rod 22 is inserted into the rotating groove 2 and fixedly connected to the upper end of the driving head 21. The lower end of the rotating rod 22 is rotatably connected to the inner wall of the pin body 1 through a bearing. External threads are provided on the outer walls of the upper and lower ends of the rotating rod 22. The outer wall of the lower end of the rotating rod 22 is threadedly connected to the inner wall of the threaded sleeve 25 through an external thread. The left and right ends of the threaded sleeve 25 are rotatably connected to one end of the driving rod 26 through the ear plate, and the other end of the driving rod 26 is rotatably connected to the insertion rod 27. The other end of the insertion rod 27 is located in the movable hole 16. At this time, the lower end of the driving rod 26 is tilted downward. By moving the threaded sleeve 25 on the rotating rod 22, the lower end of the driving rod 26 can be driven upward. The upper end of the driving rod 26 drives the insertion rod 27 to move to one side of the movable hole 2 13 and pass through the outside of the movable hole 2 13 to limit the pin shaft.

[0042] A fixing plate 28 is fixedly installed on the inner wall of the lower end of the cavity 18. The upper end of the rotating rod 22 passes through the side wall of the fixing plate 28 and is rotatably connected to the fixing plate 28 through a bearing. A spring 29 is fixedly installed on the outer wall of the upper end of the threaded sleeve 25. The spring 29 is sleeved on the outer wall of the rotating rod 22. The other end of the spring 29 is fixedly installed on the side wall of the fixing plate 28. When one end of the insertion rod 27 moves to the outside of the movable hole 13, the inner wall of the threaded sleeve 25 and the external thread of the lower end of the rotating rod 22 are separated, and the spring 29 is in a compressed state. At this time, the insertion rod 27 will not move when the rotating rod 22 is driven to rotate. When the rotating rod 22 is reversed, under the thrust of the spring 29, the inner wall of the threaded sleeve 25 will engage with the external thread of the lower end of the rotating rod 22, driving the threaded sleeve 25 to move downward and retracting the insertion rod 27 into the movable hole 16.

[0043] The upper end of the rotating rod 22 is threadedly connected to the long screw barrel 23 through an external thread. The upper end of the long screw barrel 23 is fixedly connected to the center of the lower end side wall of the piston 24. When the rotating rod 22 rotates clockwise, the threaded sleeve 25 and the long screw barrel 23 are driven upward at the same time. The long screw barrel 23 drives the piston 24 to move upward, squeezing the lubricating oil in the cavity 18 from the oil outlet pipe 31 to lubricate the pin shaft.

[0044] A manufacturing process for a high-strength pin specifically includes the following steps:

[0045] S1. First, a connecting groove 4 is formed on the outer wall of the upper end of the pin body 1, a threaded groove 7 is formed on the outer wall of the lower end of the lower pin body 1, a threaded hole 3 is formed on the upper end of the pin body 1, a rotation groove 2 is formed on the lower end, and a cavity 18 is formed inside. The reinforcing tube 8 is placed on the outside of the connecting groove 4 and welded. Then, the wear-resistant layer 10 is threadedly connected to the lower end of the pin body 1. At this time, the rubber pad 11 on the upper end of the wear-resistant layer 10 is in close contact with the upper outer wall of the pin body 1.

[0046] S2. Then, symmetrically open through holes 5 on the left and right sides of the upper end of the installed pin shaft, and symmetrically open movable hole 2 13 and movable hole 1 6 on the left and right side walls of the lower end;

[0047] S3. The threaded sleeve 25 and the long screw barrel 23 are respectively threadedly connected to the upper end of the rotating rod 22, and the piston 24 is fixedly installed on the upper end of the long screw barrel 23. The rotating rod 22 is rotated and connected in the cavity 18, and the outer wall of the piston 24 contacts the inner wall of the cavity 18;

[0048] S4. Rotate and connect one end of the insertion rod 27 to one end of the driving rod 26, then pass through the second movable hole 13 and insert into the first movable hole 6. The inner end of the insertion rod 27 is located in the cavity 18 and the driving rod 26 and the threaded sleeve 25 are rotated and connected;

[0049] S5. Finally, lubricating oil is injected into the cavity 18 through the threaded hole 3, and then the sealing cover 19 is installed in the threaded hole 3.

[0050] When the device is working, lubricating oil is injected into the cavity 18 through the threaded hole 3, and then the sealing cover 19 is installed in the threaded hole 3, and then the pin is inserted into the position where it needs to be fixed. By rotating the rotating rod 22 to allow the threaded sleeve 25 to move on the rotating rod 22, the lower end of the driving rod 26 can be driven upward, and the upper end of the driving rod 26 drives the insertion rod 27 to the side of the movable hole 2 13 and passes through the outside of the movable hole 2 13 to limit the pin, and at the same time drives the long screw barrel 23 to move upward, and the long screw barrel 23 drives the piston 24 to move upward, squeezing the lubricating oil in the cavity 18 from the oil outlet pipe 31 to lubricate the pin, thereby further increasing the service life of the pin.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength pin, comprising: A pin shaft body (1) is characterized in that: a cavity (18) is provided at the inner end of the pin shaft body (1), a threaded hole (3) is provided at the upper end of the pin shaft body (1), a rotation groove (2) is provided at the lower end, a movable hole (6) is symmetrically provided on the side walls on the left and right sides of the lower end of the pin shaft body (1), and a through hole (5) is symmetrically provided on the left and right sides of the upper end, the inner ends of the through hole (5) and the movable hole (6) are connected to the inner end of the cavity (18), the upper end of the cavity (18) is connected to the lower end of the threaded hole (3), and the cavity (18) is connected to the inner end of the cavity (18). The lower end of the rotating groove (2) is connected to the upper end of the rotating groove (2), and a piston (24) is movably installed in the cavity (18). The outer end side wall of the piston (24) contacts the inner end side wall of the cavity (18). A rotating rod (22) is rotatably connected in the cavity (18), and a threaded sleeve (25) is threadedly connected on the outer wall of the rotating rod (22). The left and right ends of the threaded sleeve (25) are rotatably connected to the driving rod (26), and one end of the driving rod (26) is rotatably connected to the insertion rod (27). The other end of the insertion rod (27) is located in the movable hole (6); A reinforcing tube (8) is sleeved on the outer wall of the pin body (1), and a plurality of reinforcing strips (9) are evenly fixedly installed on the outer side wall of the reinforcing tube (8). The outer end of the reinforcing strip (9) is provided with a wear-resistant layer (10), and the lower end of the wear-resistant layer (10) is threadedly connected to the outer wall of the lower end of the pin body (1) through a threaded tube (14). Two movable holes (13) are symmetrically opened on the side walls on the left and right sides of the lower end of the wear-resistant layer (10), and the movable hole (13) is located directly outside the movable hole (6); A driving head (21) is rotatably connected in the rotating groove (2), and a hexagonal groove is provided on the outer wall of the lower end of the driving head (21). The upper end of the driving head (21) is fixedly connected to the lower end of the rotating rod (22). The lower end of the rotating rod (22) is rotatably connected to the inner wall of the pin body (1) through a bearing. A fixing plate (28) is fixedly installed on the inner wall of the lower end of the cavity (18). The upper end of the rotating rod (22) passes through the side wall of the fixing plate (28) and is rotatably connected to the fixing plate (28) through a bearing. The outer walls of the upper and lower ends of the rotating rod (22) are both provided with external threads. The rotating rod ( The outer wall of the lower end of the threaded sleeve (22) is threadedly connected to the inner wall of the threaded sleeve (25) through an external thread, and the left and right ends of the threaded sleeve (25) are rotatably connected to one end of the driving rod (26) through an ear plate. A spring (29) is fixedly installed on the outer wall of the upper end of the threaded sleeve (25), and the spring (29) is sleeved on the outer wall of the rotating rod (22). The other end of the spring (29) is fixedly installed on the side wall of the fixed plate (28). The upper end of the rotating rod (22) is threadedly connected to the long screw barrel (23) through an external thread, and the upper end of the long screw barrel (23) is fixedly connected to the center of the lower end side wall of the piston (24); When one end of the insertion rod (27) moves to the outside of the second movable hole (13), the inner wall of the threaded sleeve (25) and the external thread of the lower end of the rotating rod (22) are separated, and the spring (29) is in a compressed state. At this time, the insertion rod (27) will not move even if the rotating rod (22) is driven to rotate. When the rotating rod (22) is reversed, under the thrust of the spring (29), the inner wall of the threaded sleeve (25) will be engaged with the external thread of the lower end of the rotating rod (22), driving the threaded sleeve (25) to move downward, and the insertion rod (27) will be retracted into the first movable hole (6).

2. The high-strength pin according to claim 1, characterized in that: The threaded hole (3) is convex, and a blocking cover (19) is connected to the threaded hole (3) through an inner thread. A sealing gasket (20) is fixedly mounted on the side wall of the lower end of the blocking cover (19). When the blocking cover (19) is threadedly mounted in the threaded hole (3), the lower end of the sealing gasket (20) and the inner wall of the upper end of the threaded hole (3) are tightly connected.

3. The high-strength pin according to claim 1, characterized in that: A connecting groove (4) is provided on the outer wall of the upper end of the pin shaft body (1), and the connecting groove (4) is located at the upper end of the movable hole (6). The reinforcing tube (8) is sleeved on the outer side of the connecting groove (4) and welded. Through holes (5) are symmetrically provided on the left and right sides of the upper end of the reinforcing tube (8), and the through holes (5) are located between two adjacent reinforcing bars (9).

4. The high-strength pin according to claim 1, characterized in that: A threaded groove (7) is provided on the outer wall of the lower end of the pin body (1), a threaded cylinder (14) is fixedly installed on the inner wall of the lower end of the wear-resistant layer (10), a rubber pad (11) is fixedly installed on the side wall of the upper end of the wear-resistant layer (10), an annular oil outlet ring (15) and a plurality of strip-shaped oil guide grooves (16) are provided on the outer wall of the upper end of the wear-resistant layer (10), the upper end of the oil guide groove (16) is connected to the oil outlet ring (15), and two through holes (5) are symmetrically provided at the inner end of the oil outlet ring (15). After the wear-resistant layer (10) is installed, the wear-resistant layer (10), the reinforcing cylinder (8) and the through hole (5) at the upper end of the pin body (1) are connected to form an oil channel, and an oil outlet pipe (31) is inserted into the oil channel and fixed by an adhesive layer (30).

5. A process for manufacturing a high-strength pin according to any one of claims 1 to 4, characterized in that: The specific steps include: S1. First, a connecting groove (4) is formed on the outer wall of the upper end of the pin body (1), a threaded groove (7) is formed on the outer wall of the lower end of the lower pin body (1), a threaded hole (3) is formed on the upper end of the pin body (1), a rotation groove (2) is formed on the lower end, and a cavity (18) is formed inside. The reinforcing tube (8) is placed on the outer side of the connecting groove (4) and welded. Then, the wear-resistant layer (10) is threadedly connected to the lower end of the pin body (1). At this time, the rubber pad (11) on the upper end of the wear-resistant layer (10) is in close contact with the outer wall of the upper end of the pin body (1); S2, then symmetrically open through holes (5) on the left and right sides of the upper end of the installed pin shaft, and symmetrically open movable hole 2 (13) and movable hole 1 (6) on the left and right side walls of the lower end; S3, threading the threaded sleeve (25) and the long screw barrel (23) together at the upper end of the rotating rod (22), and fixing the piston (24) at the upper end of the long screw barrel (23), rotating the rotating rod (22) into the cavity (18), and making the outer wall of the piston (24) contact the inner wall of the cavity (18); S4, one end of the insertion rod (27) is connected to one end of the driving rod (26) by rotation, and then passed through the second movable hole (13) and inserted into the first movable hole (6), the inner end of the insertion rod (27) is located in the cavity (18) and the driving rod (26) and the threaded sleeve (25) are connected by rotation; S5. Finally, lubricating oil is injected into the cavity (18) through the threaded hole (3), and then a sealing cover (19) is installed in the threaded hole (3).

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