A high-precision cylinder head

Abstract

The present invention discloses a high-precision oil cylinder head, comprising a cylinder, one end face of the cylinder being fixedly connected to a fixed limit block, a liquid inlet being provided on the fixed limit block, the liquid inlet being connected to the interior of the cylinder, a support block being fixedly connected to the inner side wall of the end of the cylinder having the liquid inlet, and a first high-pressure shock-absorbing spring being fixedly connected to the piston on one side of the support block. The high-precision oil cylinder head described in the present invention is provided with a joint connected to the piston rod through a cylindrical fixed block and a threaded connecting rod by providing a first threaded hole, a second threaded hole and a thread on the piston rod, so that the joint is not easily damaged and is easy to replace and repair. A support block is provided inside the cylinder, and a high-pressure shock-absorbing spring is provided on the piston to reduce the impact force and reduce damage to the cylinder and the connector. The structure is simple and reasonable, replacement is light and labor-saving, and operation is convenient, saving the economic cost of repair and replacement.

Description

Technical Field

[0001] The present invention relates to the field of oil cylinder heads, in particular to a high-precision oil cylinder head. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It features a simple structure and reliable operation. However, the cylinder needs to be fixed while operating. With the development of my country's industry, hydraulic transmission and control have been widely used in various types of heavy machinery and equipment. As hydraulic technology advances toward higher pressures and higher speeds, the starting and reversing shocks of hydraulic cylinders cause significant hydraulic shocks to the main machine. This impact, particularly the cylinder head, a key component that secures the cylinder, suffers from severe wear. Most existing cylinder heads are integrally designed. Over long periods of operation, the head, which is fixed to the end of the piston rod, often suffers damage from repeated impact and vibration. This integral design increases the cost of replacing the connector. Furthermore, during operation, the piston rod of an existing hydraulic cylinder reciprocates within the cylinder body. Due to its inherent mass, the piston rod generates significant kinetic energy under pressure. When the piston rod reaches its terminal point, it often mechanically collides with the cylinder head and cylinder bottom, generating significant impact pressure. These impacts are not buffered, resulting in a high damage rate for the connector, making it difficult to replace and significantly impacting the performance of the machinery. Summary of the Invention

[0003] The main purpose of the present invention is to provide a high-precision cylinder head, which can effectively solve the problem in the background technology that the impact force of the hydraulic cylinder is too large, resulting in high damage to the connecting head and difficulty in replacement.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] The cam is secured to the piston rod and is accessible through the cam face and is adapted to engage said piston rod and is accessible through the cam face of said piston rod. A second main seal is provided on one side of the first dust ring, and a second dust ring is provided on one side of the second main seal, the piston rod passes through the center of the stop block and the output end cylinder cover, and two grooves are provided on the inner wall of the stop block that contacts the piston rod, and a third main seal and a third dust ring are tightly installed in the two grooves respectively. One end surface of the piston rod is provided with a second threaded hole, and the middle of the second threaded hole is provided with several first threaded holes communicating with the outer wall of the piston rod, and the first threaded hole is located on both sides of the port of the piston rod outside. The thread cooperates with the cylindrical fixing block, and the cylindrical fixing block is fixedly connected to the joint, and a through hole is provided in the center of the joint, and a cavity is provided inside the cylindrical fixing block, and a threaded connecting rod fixedly connected to the joint is provided in the cavity, and the threaded connecting rod cooperates with the second threaded hole provided in the end surface of the piston rod, and the cylindrical fixing block is provided with several fixing holes that cooperate with the first threaded hole, and several of the fixing holes are tightly connected to the first threaded hole by limiting screws.

[0006] Preferably, the outer surface of the piston rod is provided with a nickel plating layer with a thickness of 0.02 mm, and a chrome plating layer with a thickness of 0.04 mm is provided outside the nickel plating layer.

[0007] Preferably, the first primary seal is lip-shaped.

[0008] Preferably, a threaded slot is provided at the center of one end surface of the piston, and the threaded slot is tightly connected to the piston rod thread.

[0009] Preferably, the piston is formed by integrally casting two cylinders, one large and one small, and has a convex shape.

[0010] Preferably, the support block is annular, and the fixed position of the annular support block is such that after the first high-pressure shock-absorbing spring is compressed to 70%, the piston contacts the bottom of the cylinder.

[0011] Preferably, the thread provided on the end of the piston rod is threadedly connected to the cavity wall on the cylindrical fixing block.

[0012] Preferably, the length of the threaded connecting rod is greater than the length of the cylindrical fixing block.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the high-precision cylinder head:

[0014] By opening a second threaded hole at the end of the piston rod, opening several first threaded holes connected to the outer wall of the piston rod in the middle of the second threaded hole, and opening threads on the sides of the first threaded holes, a joint fixedly connected to a cylindrical fixing block and a threaded connecting rod is provided. The threaded connecting rod is located in the middle of the cavity opened on the cylindrical fixing block. The joint is tightly connected to the piston rod through the cylindrical fixing block and the threaded connecting rod. If the joint is damaged, the tightness is reduced, which makes it easy to directly replace the joint without the need for overall disassembly and maintenance.

[0015] By fixing a circular support block inside the cylinder and fixing a high-pressure shock-absorbing spring on the piston of the piston rod, the impact force of the piston rod repeatedly moving in the cylinder on the oil inlet end of the cylinder is reduced, thereby reducing damage to the cylinder and the connecting head.

[0016] The entire joint connection structure is simple and reasonable, replacement is light and labor-saving, easy to operate, the effect is better than the traditional one, it is easier to maintain, and the economic cost of maintenance and replacement is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall connection structure of a high-precision cylinder head of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the overall connection structure of a high-precision cylinder head of the present invention;

[0019] Figure 3 This is a partial structural diagram of the internal schematic diagram of the overall connection structure of a high-precision cylinder head of the present invention;

[0020] Figure 4 This is a partial structural diagram of a high-precision cylinder head of the present invention;

[0021] Figure 5 This is a schematic diagram of the overall structure of the joint part of a high-precision cylinder head of the present invention;

[0022] Figure 6 This is a schematic structural diagram of a joint connection of a high-precision cylinder head of the present invention;

[0023] Figure 7 This is a cross-sectional view of a joint of a high-precision cylinder head according to the present invention.

[0024] In the figure: 1. Cylinder; 2. Fixed limit block; 3. Piston rod; 4. Liquid inlet; 5. Piston; 6. Anti-pollution oil seal; 7. First main seal; 8. Guide ring; 9. Liquid outlet; 10. Second main seal; 11. First dust ring; 12. Output end cylinder cover; 13. First high-pressure shock-absorbing spring; 14. Support block; 15. Wear-resistant ring; 16. Guide block; 17. Second dust ring; 18. Second high-pressure shock-absorbing spring; 19. Stop block; 20. Joint; 21. Through hole; 22. Cylindrical fixed block; 23. Limit screw; 24. First threaded hole; 25. Second threaded hole; 26. Cavity; 27. Threaded connecting rod; 28. Third main seal; 29. ​​Third dust ring. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] like Figure 1-7As shown, a high-precision cylinder head includes a cylinder barrel 1. One end face of the cylinder barrel 1 is fixedly connected to a fixed limit block 2 by a plurality of bolts. A liquid inlet 4 is provided on the fixed limit block 2. The liquid inlet 4 is connected to the interior of the cylinder barrel 1. A threaded groove for connecting to a hydraulic oil input pipe is provided on the liquid inlet 4. A support block 14 is fixedly connected to the inner side wall of the end of the cylinder barrel 1 where the liquid inlet 4 is provided. A first high-pressure shock-absorbing spring 13 fixedly connected to a piston 5 is provided on one side of the support block 14. The piston 5 is tightly connected to the end of the piston rod 3. An anti-pollution oil seal 6 is provided on one side of the first high-pressure shock-absorbing spring 13. The anti-pollution oil seal 6 One side of the piston 5 is tightly connected with the first main seal 7, one side of the first main seal 7 is provided with a wear-resistant ring 15, one side of the wear-resistant ring 15 is installed with a guide ring 8, one side of the guide ring 8 is provided with a guide block 16, the anti-pollution oil seal 6, the first main seal 7, the wear-resistant ring 15, the guide ring 8 and the guide block 16 are all arranged on the surface of the piston 5 and are tightly connected to the inner wall of the cylinder 1, the other end of the cylinder 1 is provided with an output end cylinder cover 12, one side of the output end cylinder cover 12 is provided with a liquid outlet 9, the inner side of the output end cylinder cover 12 is provided with a stopper 19 fixedly connected by a second high-pressure shock-absorbing spring 18, and the surface of the stopper 19 is tightly connected. A first dust ring 11 is tightly installed, a second main seal 10 is provided on one side of the first dust ring 11, a second dust ring 17 is provided on one side of the second main seal 10, the piston rod 3 passes through the center of the stopper 19 and the output end cylinder cover 12, and two grooves are provided on the inner wall of the stopper 19 in contact with the piston rod 3, and a third main seal 28 and a third dust ring 29 are tightly installed in the two grooves respectively. A second threaded hole 25 is provided on one end face of the piston rod 3, and a plurality of first threaded holes 24 communicating with the outer wall of the piston rod 3 are provided in the middle of the second threaded hole 25. The first threaded hole 24 is located at the piston rod 3. Both sides of the external port are provided with threads, which cooperate with the cylindrical fixing block 22. The cylindrical fixing block 22 is fixedly connected to the joint 20. A through hole 21 is provided at the center of the joint 20. A cavity 26 is provided inside the cylindrical fixing block 22. A threaded connecting rod 27 fixedly connected to the joint 20 is provided in the cavity 26. The threaded connecting rod 27 cooperates with the second threaded hole 25 provided on the end face of the piston rod 3. Several fixing holes that cooperate with the first threaded hole 24 are provided on the cylindrical fixing block 22. Several fixing holes are tightly connected to the first threaded hole 24 through a limiting screw 23;

[0029] The outer surface of the piston rod 3 is provided with a nickel plating layer of 0.02 mm thick, and a chrome plating layer of 0.04 mm thick is provided on the nickel plating layer to increase the surface smoothness of the piston rod 3, increase the hardness of the piston rod 3, and reduce the wear of the piston rod 3; the first main seal 7 is lip-shaped, which can effectively block the flow of hydraulic oil and enhance the sealing effect; a threaded slot is provided at the center of one end face of the piston 5, and the threaded slot is tightly connected to the piston rod 3 thread; the piston 5 is cast as one piece of two cylinders, one large and one small, in the shape of a convex character; the support block 14 is annular, and the fixed position of the annular support block 14 is after the first high-pressure shock-absorbing spring 13 is compressed by 70%, The piston 5 contacts the bottom of the cylinder 1, avoiding repeated extreme compression of the first high-pressure shock-absorbing spring 13, reducing the degree of reduction in the rebound force of the first high-pressure shock-absorbing spring 13, and avoiding opening the cylinder 1 to replace the first high-pressure shock-absorbing spring 13 fixedly connected to the piston 5; the thread opened at the end of the piston rod 3 is threadedly connected to the wall of the cavity 26 on the cylindrical fixing block 22; the length of the threaded connecting rod 27 is greater than the length of the cylindrical fixing block 22, avoiding the complete overlap of the contact force points of the cylindrical fixing block 22 and the threaded connecting rod 27 with the end of the piston rod 3, which is conducive to sharing the pulling force at the end of the piston rod 3 and reducing damage such as cracking at the end of the piston rod 3.

[0030] It should be noted that the present invention is a high-precision oil cylinder head. When in use, the fixed limit block 2 fixedly connected to one end of the cylinder barrel 1 is connected to a fixed object, the hydraulic oil pipe is threadedly connected to the liquid inlet 4 opened on the fixed limit block 2, the other hydraulic oil pipe is threadedly connected to the liquid outlet 9 provided at the output end of the cylinder barrel 1, the joint 20 fixedly connected with the threaded connecting rod 27 is threadedly connected to the second threaded hole 25 opened on the end face of the piston rod 3, the rotation of the threaded connecting rod 27 causes the cylindrical fixed block 22 fixedly connected by the joint 20 to rotate, the cavity 26 opened inside the cylindrical fixed block 22 is threadedly connected in conjunction with the thread opened on the end of the piston rod 3, and the joint 20 is threadedly connected through the fixed cylindrical fixed block 22 and the threaded connecting rod 2 After 7 is fastened to the piston rod 3, several fixing holes provided on the cylindrical fixing block 22 cooperate with several first threaded holes 24 provided on the piston rod 3, and the limiting screw 23 is fixed and limited through several fixing holes provided on the cylindrical fixing block 22 and several first threaded holes 24 provided on the piston rod 3. The cylindrical fixing block 22 and the threaded connecting rod 27 cannot be rotated and displaced from the piston rod 3. By adjusting the hydraulic pump, the hydraulic oil flows through the hydraulic oil pipe and enters the interior of the cylinder 1 through the liquid inlet 4. Under the sealing action of the anti-pollution oil seal 6 and the first main seal 7 provided on the piston 5, the hydraulic oil entering the confined space continuously squeezes the piston 5 forward, and the piston rod 3 tightly connected to the piston 5 thread is thrust forward, and the guide valve provided on the piston 5 Under the action of the ring 8 and the guide block 16, the piston rod 3 moves forward in a two-dimensional straight line in the cylinder 1. When the piston rod 3 extends to a certain length, the piston 5 contacts the block 19. The second high-pressure shock-absorbing spring 18 provided between the position where the other side of the block 19 contacts the output end cylinder cover 12 is compressed to form a gradually resisting thrust, so that the block 19 subjected to the instantaneous impact will not contact the output end cylinder cover 12 in an instant, thereby reducing the instantaneous impact force and the generated sound. The hydraulic oil in the cylinder 1 is discharged through the liquid outlet 9, and the piston rod 3 is pressed downward into the cylinder 1 under the action of the pressure at the output end. The first high-pressure shock-absorbing spring 13 fixedly provided on the convex piston 5 contacts the support block 14 fixedly connected to the inner side wall of the end of the cylinder 1, and the second high-pressure shock-absorbing spring 1 8 is compressed, and the piston rod 3 fixedly connected to the second high-pressure shock-absorbing spring 18 through the piston 5 is decelerated and pressed until the piston 5 contacts and stops with the end of the cylinder 1, reducing the collision between the piston 5 and the bottom of the cylinder 1, so that the vibration of the joint 20 at the end of the piston rod 3 and the fixed limit block 2 at the end of the cylinder 1 is reduced, and the connection objects closely connected with them are subjected to less pressure. The hydraulic oil continuously circulates back and forth in the cylinder 1 through the liquid inlet 4 and the liquid outlet 9 from the outside, so that the piston rod 3 in the cylinder 1 also continuously performs linear reciprocating motion. When the joint 20 is worn out due to long-term movement, resulting in insufficient connection precision, it is only necessary to rotate the cylindrical fixing block 22 and the limiting screw 23 on the piston rod 3, and loosen and remove several limiting screws 23 connecting the cylindrical fixing block 22 and the piston rod 3.After that, the joint 20 is rotated, and the cylindrical fixing block 22 and the threaded connecting rod 27 fixedly connected to the joint 20 are rotated to loosen the end of the piston rod 3. The joint 20 can be directly removed and replaced, and a new joint 20 is fixedly connected to the end of the piston rod 3. There is no need to open the cylinder 1 to replace the piston rod 3. Different sizes of joints 20 can be replaced to meet different usage requirements. The entire structure is easy to install and tighten.

[0031] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision cylinder head, characterized by: The invention comprises a cylinder (1), wherein one end face of the cylinder (1) is fixedly connected to a fixed limit block (2), a liquid inlet (4) is provided on the fixed limit block (2), the liquid inlet (4) is connected to the interior of the cylinder (1), a support block (14) is fixedly connected to the inner side wall of the end of the cylinder (1) where the liquid inlet (4) is provided, a first high-pressure damping spring (13) fixedly connected to the piston (5) is provided on one side of the support block (14), the piston (5) is tightly connected to the end of the piston rod (3), an anti-pollution oil seal (6) is provided on one side of the first high-pressure damping spring (13), a first main seal (7) is tightly connected to one side of the anti-pollution oil seal (6), and a first main seal (7) is provided on one side of the first main seal (7). A wear-resistant ring (15), a guide ring (8) is installed on one side of the wear-resistant ring (15), a guide block (16) is provided on one side of the guide ring (8), the anti-pollution oil seal (6), the first main seal (7), the wear-resistant ring (15), the guide ring (8) and the guide block (16) are all arranged on the surface of the piston (5) and are tightly connected to the inner wall of the cylinder (1), the other end of the cylinder (1) is provided with an output end cylinder cover (12), one side of the output end cylinder cover (12) is provided with a liquid outlet (9), the inner side of the output end cylinder cover (12) is provided with a stopper (19) fixedly connected through a second high-pressure shock-absorbing spring (18), the surface of the stopper (19) is tightly installed with a first dust ring (11), the A second main seal (10) is provided on one side of the first dustproof ring (11), and a second dustproof ring (17) is provided on one side of the second main seal (10). The piston rod (3) passes through the center of the stopper (19) and the output end cylinder cover (12). Two grooves are provided on the inner wall of the center of the stopper (19) in contact with the piston rod (3). A third main seal (28) and a third dustproof ring (29) are tightly installed in the two grooves respectively. A second threaded hole (25) is provided on one end surface of the piston rod (3). A plurality of first threaded holes (24) connected to the outer wall of the piston rod (3) are provided in the middle of the second threaded hole (25). The first threaded holes (24) are located on both sides of the port outside the piston rod (3). The sides are provided with threads, the threads cooperate with the cylindrical fixing block (22), the cylindrical fixing block (22) is fixedly connected to the joint (20), the center of the joint (20) is provided with a through hole (21), the cylindrical fixing block (22) is provided with a cavity (26), the cavity (26) is provided with a threaded connecting rod (27) fixedly connected to the joint (20), the threaded connecting rod (27) cooperates with the second threaded hole (25) provided on the end face of the piston rod (3), the cylindrical fixing block (22) is provided with a plurality of fixing holes that cooperate with the first threaded hole (24), and the plurality of fixing holes are tightly connected to the first threaded hole (24) through a limiting screw (23).

2. A high-precision cylinder head according to claim 1, characterized in that: The outer surface of the piston rod (3) is provided with a nickel plating layer with a thickness of 0.02 mm, and a chrome plating layer with a thickness of 0.04 mm is provided outside the nickel plating layer.

3. The high-precision cylinder head according to claim 1, characterized in that: The first main seal (7) is lip-shaped.

4. The high-precision cylinder head according to claim 1, characterized in that: A threaded slot is provided at the center of one end surface of the piston (5), and the threaded slot is tightly connected to the piston rod (3) by thread.

5. The high-precision cylinder head according to claim 1, characterized in that: The piston (5) is formed by integrally casting two cylinders, one large and one small, and has a convex shape.

6. The high-precision cylinder head according to claim 1, characterized in that: The support block (14) is annular, and the fixed position of the annular support block (14) is such that after the first high-pressure damping spring (13) is compressed to 70%, the piston (5) contacts the bottom of the cylinder (1).

7. The high-precision cylinder head according to claim 1, characterized in that: The thread formed on the end of the piston rod (3) is threadedly connected to the wall of the cavity (26) on the cylindrical fixing block (22).

8. The high-precision cylinder head according to claim 1, characterized in that: The length of the threaded connecting rod (27) is greater than the length of the cylindrical fixing block (22).

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