Buffering mechanism for guide sleeve of hydraulic oil cylinder

Abstract

The utility model discloses a hydraulic oil cylinder guide sleeve buffering mechanism which comprises a cylinder body, a guide sleeve is fixedly installed on the inner wall of the upper end of the cylinder body, a piston rod is movably connected to the inner wall of the guide sleeve in an attached mode, and a movable piston is fixedly installed on the outer curved surface of the lower end of the piston rod. The front sides of the upper and lower ends of the cylinder body are fixedly communicated with an upper oil port and a lower oil port in a penetrating manner; an annular oil groove is formed in the middle of the lower end of the guide sleeve, upper buffer grooves are formed in the two sides of the lower end of the guide sleeve, upper communicating openings are formed in the inner sides of the upper ends of the upper buffer grooves, upper adjusting openings are formed in the outer sides of the upper ends of the upper buffer grooves, and upper adjusting pipes fixedly communicate with the outer sides of the upper adjusting openings. The inner wall of the upper adjusting pipe is in threaded connection with an upper adjusting bolt, and the outer curved surface of the outer side of the upper adjusting bolt is in threaded connection with an upper adjusting nut used for locking and fastening the upper adjusting bolt. When the piston rod stretches out and draws back to the end point for buffering, the buffering resistance can be adjusted conveniently.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a hydraulic cylinder guide sleeve buffer mechanism. Background Technology

[0002] A hydraulic cylinder is a linear motion actuator that converts hydraulic energy into mechanical energy, and is a core component of a hydraulic system. Its working principle is based on Pascal's law (pressure is uniformly transmitted in a closed fluid). By injecting high-pressure oil into the cylinder, the piston is driven to move, thereby outputting linear thrust or pull force.

[0003] Hydraulic cylinders achieve high-load, high-precision, and smooth linear motion through the efficient conversion of hydraulic energy, making them an indispensable power component in modern industry. Their core value lies in: a balance between power and control: irreplaceable in scenarios requiring high thrust and precise control; system integration: capable of forming complete hydraulic systems with hydraulic pumps, valve assemblies, etc., adapting to complex working conditions; and technological scalability: continuously expanding application boundaries through innovative designs such as buffer mechanisms and servo control.

[0004] However, in actual use, traditional hydraulic cylinders are prone to rigid collisions with the cylinder head when the piston rod approaches the end of its stroke during high-speed movement, resulting in noise, vibration, and mechanical damage. Existing buffer devices mostly rely on fixed throttle orifices or single spring structures. When the throttle orifice size is fixed, it cannot adapt to the buffering requirements under different load conditions, making it impossible to adjust the buffering force according to the load, thus affecting the performance of the hydraulic cylinder. Utility Model Content

[0005] The purpose of this utility model is to provide a hydraulic cylinder guide sleeve buffer mechanism to solve the problem mentioned in the background art that when the piston rod of a traditional hydraulic cylinder moves at high speed, it is easy to have a rigid collision with the cylinder head when it approaches the end of its stroke, resulting in noise, vibration and mechanical damage. Existing buffer devices mostly rely on fixed throttle orifices or single spring structures. When the size of the throttle orifice is fixed, it cannot adapt to the buffering requirements under different load conditions, so the buffering force cannot be adjusted according to the load, thus affecting the performance of the hydraulic cylinder.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cylinder body is included, a guide sleeve is fixedly installed on the inner wall of the upper end of the cylinder body, a piston rod is movably connected to the inner wall of the guide sleeve, a movable piston is fixedly installed on the outer curved surface of the lower end of the piston rod, and an upper oil port and a lower oil port are respectively fixedly connected through the front sides of the upper and lower ends of the cylinder body.

[0007] An annular oil groove is formed in the middle of the lower end of the guide sleeve. Upper buffer grooves are formed on both sides of the lower end of the guide sleeve. An upper connecting port is formed on the inner side of the upper end of the upper buffer groove. An upper adjusting port is formed on the outer side of the upper end of the upper buffer groove. An upper adjusting pipe is fixedly connected to the outer side of the upper adjusting port. An upper adjusting bolt is threadedly connected to the inner wall of the upper adjusting pipe. An upper adjusting nut for locking and tightening the upper adjusting bolt is threadedly connected to the outer curved surface of the upper adjusting bolt. An annular sealing sleeve is fixedly installed on the outer curved surface of the lower end of the piston rod. A buffer seat is fixedly installed at the bottom of the cylinder body. A cylindrical oil groove is formed in the middle of the upper end of the buffer seat. Lower buffer grooves are formed on both sides of the upper end of the buffer seat. A lower connecting port is formed on the inner side of the lower end of the lower buffer groove. A lower adjusting port is formed on the outer side of the lower end of the lower buffer groove. A lower adjusting pipe is fixedly connected to the outer side of the lower adjusting port. A lower adjusting bolt is threadedly connected to the inner wall of the lower adjusting pipe. A lower adjusting nut for locking and tightening the lower adjusting bolt is threadedly connected to the outer curved surface of the lower adjusting bolt. A sealing column is fixedly installed at the bottom of the piston rod.

[0008] Preferably, the movable piston is movably connected to the inner wall of the lower end of the cylinder, and the upper oil port and the lower oil port are respectively connected to an external hydraulic control pump through hydraulic oil pipes.

[0009] Preferably, the inner side of the upper oil port is connected to the upper end of the annular oil groove, and there are two upper buffer grooves, which are symmetrically distributed on both sides of the lower end of the guide sleeve.

[0010] Preferably, the inner side of the upper connecting port extends into the interior of the annular oil groove, and the upper adjusting port extends outward to the outer side of the upper end of the cylinder body.

[0011] Preferably, the inner wall of the upper adjusting tube is provided with internal threads, the inner side of the upper adjusting bolt extends to the inside of the upper adjusting port, the upper end of the annular sealing sleeve fits into the inner wall of the annular oil groove, and the upper end of the annular sealing sleeve is provided with rounded corners.

[0012] Preferably, the inner side of the lower oil port is connected to the lower end of the cylindrical oil groove, the inner side of the lower connecting port extends into the interior of the cylindrical oil groove, the inner wall of the lower adjusting pipe is provided with internal threads, and the lower adjusting bolt extends into the interior of the lower adjusting port.

[0013] Preferably, the outer curved surface of the sealing column fits into the inner wall of the cylindrical oil groove, and the lower end of the sealing column is provided with a rounded corner.

[0014] Preferably, a positioning ring is fixedly installed on the upper end of the buffer seat, a buffer spring is fixedly installed on the inner side of the positioning ring, a buffer ring is fixedly installed on the upper end of the buffer spring, and the buffer ring is movably connected to the inner wall of the lower end of the cylinder body. A flow hole for hydraulic oil is opened through the outer side of the buffer ring, and there are several flow holes, which are symmetrically distributed on the outer side of the buffer ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] When hydraulic oil cannot smoothly pass through the lower end of the annular oil groove and directly enter the upper oil port for outward discharge, the hydraulic oil will enter the upper connecting port through the upper buffer grooves opened on both sides of the lower end of the guide sleeve. When the hydraulic oil enters the upper connecting port, it will be discharged into the inner wall of the upper end of the annular oil groove through the upper connecting port, and then discharged outward through the upper oil port. Compared with the hydraulic oil being discharged directly from the lower end of the annular oil groove into the upper oil port, the upper buffer groove reduces the flow area of ​​the hydraulic oil, thereby increasing the flow resistance of the hydraulic oil. When the flow resistance of the hydraulic oil increases, it will have a buffering effect when the piston rod moves upward in a straight line and approaches the end point. Similarly, when the piston rod moves downward in a straight line, it will drive the lower end of the sealing column to move downward in a straight line and block it to the inner wall of the upper end of the cylindrical oil groove, so that the hydraulic oil passes through the lower buffer groove, thereby increasing the flow resistance of the hydraulic oil and having a buffering effect when the piston rod moves downward in a straight line and approaches the end point, thus realizing the buffering effect of facilitating the extension and retraction of the piston rod to the end point.

[0017] This invention also allows for adjustment of the piston rod's buffering effect when the upper and lower adjusting bolts are rotated. As the upper and lower adjusting bolts rotate, they move inward and outward due to the force generated by their threaded connection with the inner walls of the upper and lower adjusting pipes. This movement adjusts the flow space within the upper and lower buffer grooves, increasing or decreasing the flow resistance of the hydraulic oil within them. This achieves buffering at the piston rod's extension and retraction point while simultaneously facilitating adjustment of the buffering resistance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a hydraulic cylinder guide sleeve buffer mechanism according to the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of the overall structure of a hydraulic cylinder guide sleeve buffer mechanism according to this utility model;

[0020] Figure 3 This is a partial cross-sectional view of a hydraulic cylinder guide sleeve buffer mechanism according to the present invention. Figure 1 ;

[0021] Figure 4 This is a partial cross-sectional view of a hydraulic cylinder guide sleeve buffer mechanism according to the present invention. Figure 2 .

[0022] In the diagram: 1. Cylinder block; 2. Guide sleeve; 3. Piston rod; 4. Upper oil port; 5. Lower oil port; 6. Annular oil groove; 7. Upper buffer groove; 8. Upper connecting port; 9. Upper adjusting port; 10. Upper adjusting pipe; 11. Upper adjusting bolt; 12. Upper adjusting nut; 13. Annular sealing sleeve; 14. Buffer seat; 15. Cylindrical oil groove; 16. Lower buffer groove; 17. Lower connecting port; 18. Lower adjusting port; 19. Lower adjusting pipe; 20. Moving piston; 21. Lower adjusting bolt; 22. Lower adjusting nut; 23. Sealing column; 24. Positioning ring; 25. Buffer spring; 26. Buffer ring; 27. Flow hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution for a hydraulic cylinder guide sleeve buffer mechanism: it includes a cylinder body 1, a guide sleeve 2 is fixedly installed on the inner wall of the upper end of the cylinder body 1, a piston rod 3 is movably connected to the inner wall of the guide sleeve 2, a movable piston 20 is fixedly installed on the outer curved surface of the lower end of the piston rod 3, and the movable piston 20 is movably connected to the inner wall of the lower end of the cylinder body 1. The upper oil port 4 and the lower oil port 5 are respectively fixedly connected through the front sides of the upper and lower ends of the cylinder body 1, and the upper oil port 4 and the lower oil port 5 are respectively connected to an external hydraulic control pump through hydraulic oil pipes.

[0025] An annular oil groove 6 is provided in the middle of the lower end of the guide sleeve 2, and the inner side of the upper oil port 4 is connected to the upper end of the annular oil groove 6. Upper buffer grooves 7 are provided on both sides of the lower end of the guide sleeve 2, and there are two upper buffer grooves 7, symmetrically distributed on both sides of the lower end of the guide sleeve 2. An upper connecting port 8 is provided on the inner side of the upper end of the upper buffer groove 7, and the inner side of the upper connecting port 8 extends into the interior of the annular oil groove 6. An upper adjusting port 9 is provided on the outer side of the upper end of the upper buffer groove 7, and the upper adjusting port 9 extends outward to the outer side of the upper end of the cylinder block 1. The outer side of the upper adjusting port 9 is fixedly connected. There is an upper adjusting tube 10, and the inner wall of the upper adjusting tube 10 is provided with internal threads. The inner wall of the upper adjusting tube 10 is threadedly connected to an upper adjusting bolt 11, and the inner side of the upper adjusting bolt 11 extends into the upper adjusting port 9. The outer curved surface of the upper adjusting bolt 11 is threadedly connected to an upper adjusting nut 12 for locking and tightening the upper adjusting bolt 11. The lower end of the piston rod 3 is fixedly installed with an annular sealing sleeve 13, and the upper end of the annular sealing sleeve 13 fits into the inner wall of the annular oil groove 6. The upper end of the annular sealing sleeve 13 is provided with a rounded corner.

[0026] A buffer seat 14 is fixedly installed at the bottom of the cylinder body 1. A cylindrical oil groove 15 is opened in the middle of the upper end, and the inner side of the lower oil port 5 is connected to the lower end of the cylindrical oil groove 15. Lower buffer grooves 16 are opened on both sides of the upper end of the buffer seat 14. A lower connecting port 17 is opened on the inner side of the lower end of the lower buffer groove 16, and the inner side of the lower connecting port 17 extends into the interior of the cylindrical oil groove 15. A lower adjusting port 18 is opened on the outer side of the lower end of the lower buffer groove 16. A lower adjusting pipe 19 is fixedly connected to the outer side of the lower adjusting port 18. The inner wall of the lower adjusting pipe 19 is threaded, and a lower adjusting bolt 21 is threaded to the inner wall of the lower adjusting pipe 19. The lower adjusting bolt 21 extends into the interior of the lower adjusting port 18. A locking bolt 21 is threaded to the outer curved surface of the lower adjusting bolt 21. The lower adjusting nut 22 is used. A sealing column 23 is fixedly installed at the bottom of the piston rod 3, and the outer curved surface of the sealing column 23 fits with the inner wall of the cylindrical oil groove 15. The lower end of the sealing column 23 has a rounded corner. A positioning ring 24 is fixedly installed at the upper end of the buffer seat 14. A buffer spring 25 is fixedly installed inside the positioning ring 24. A buffer ring 26 is fixedly installed at the upper end of the buffer spring 25. The buffer ring 26 is movably connected to the lower inner wall of the cylinder body 1, so that the cylinder body 1 can limit the linear movement of the buffer ring 26. A flow hole 27 for hydraulic oil to flow through is opened on the outer side of the buffer ring 26. The flow hole 27 reduces the resistance of the buffer ring 26 to the hydraulic oil inside the cylinder body 1. There are several flow holes 27, which are symmetrically distributed on the outer side of the buffer ring 26.

[0027] Working principle: In use, this utility model connects the upper oil port 4 and the lower oil port 5 to an external hydraulic control pump through hydraulic oil pipes. When the upper oil port 4 and the lower oil port 5 are connected to the external hydraulic control pump, the hydraulic oil can be discharged into or out of the upper and lower ends of the cylinder 1 by the upper oil port 4 and the lower oil port 5 respectively cooperating with the annular oil groove 6 and the cylindrical oil groove 15. When the hydraulic oil is discharged into or out of the upper and lower ends of the cylinder 1, the moving piston 20 is driven to move up and down linearly along the inner wall of the cylinder 1 under the thrust of the hydraulic oil. When the moving piston 20 moves up and down linearly, it will drive the piston rod 3 to extend and retract up and down.

[0028] When the piston rod 3 extends upward, it will cause the annular sealing sleeve 13 to move upward in a straight line. When the annular sealing sleeve 13 moves upward in a straight line near the end position, it will cause the upper end of the annular sealing sleeve 13 to move to the lower inner wall of the annular oil groove 6, and the upper end of the annular sealing sleeve 13 and the inner wall of the annular oil groove 6 will fit together. When the upper end of the annular sealing sleeve 13 moves to the lower inner wall of the annular oil groove 6, it will block the lower inner wall of the annular oil groove 6, so that the hydraulic oil inside the upper end of the cylinder 1 cannot smoothly pass through the lower end of the annular oil groove 6 to directly enter the upper oil port 4 for discharge. When the hydraulic oil cannot smoothly pass through the lower end of the annular oil groove 6 to directly enter the upper oil port 4 for discharge, the hydraulic oil will enter the upper connecting port 8 through the upper buffer grooves 7 opened on both sides of the lower end of the guide sleeve 2. When the hydraulic oil is connected to the inside of the upper connecting port 8, it will be discharged into the inner wall of the upper end of the annular oil groove 6 through the upper connecting port 8, and then discharged outward through the upper oil port 4. Compared with the hydraulic oil being discharged directly from the lower end of the annular oil groove 6 into the upper oil port 4, the hydraulic oil flow area will be reduced through the upper buffer groove 7, which will increase the flow resistance of the hydraulic oil. When the flow resistance of the hydraulic oil increases, it will have a buffering effect when the piston rod 3 moves upward in a straight line and approaches the end point. Similarly, when the piston rod 3 moves downward in a straight line, it will drive the lower end of the sealing column 23 to move downward in a straight line to the inner wall of the upper end of the cylindrical oil groove 15 to block it, so that the hydraulic oil passes through the lower buffer groove 16, thereby increasing the flow resistance of the hydraulic oil and having a buffering effect when the piston rod 3 moves downward in a straight line and approaches the end point, thus realizing the buffering effect of facilitating the extension and retraction of the piston rod 3 to the end point.

[0029] Simultaneously, when the piston rod 3 retracts to its end point, the moving piston 20 pushes the buffer ring 26 to move linearly downward along the inner wall of the cylinder 1. When the buffer ring 26 moves linearly downward, it pushes and compresses the buffer spring 25. When the buffer spring 25 is pushed and compressed, the elastic potential energy generated by the compression deformation of the buffer spring 25 further plays a buffering role for the piston rod 3. At the same time, when it is necessary to adjust the buffering effect of the piston rod 3, the upper adjusting bolt 11 and the lower adjusting bolt 21 are rotated respectively. When the upper adjusting bolt 11 and the lower adjusting bolt 21 are rotated, they will move inward and outward due to the force generated by the threaded connection with the inner wall of the upper adjusting pipe 10 and the lower adjusting pipe 19. When the upper adjusting bolt 11 and the lower adjusting bolt 21 move inward and outward, they will adjust the size of the flow space inside the upper buffer groove 7 and the lower buffer groove 16, so that the flow resistance of the hydraulic oil inside the upper buffer groove 7 and the lower buffer groove 16 increases or decreases. Thus, while the piston rod 3 extends and retracts to its end point for buffering, it is easy to adjust the size of the buffering resistance.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder guide sleeve buffer mechanism, characterized in that: The cylinder includes a cylinder body (1), a guide sleeve (2) is fixedly installed on the inner wall of the upper end of the cylinder body (1), a piston rod (3) is movably connected to the inner wall of the guide sleeve (2), a movable piston (20) is fixedly installed on the outer curved surface of the lower end of the piston rod (3), and an upper oil port (4) and a lower oil port (5) are respectively fixedly connected through the front sides of the upper and lower ends of the cylinder body (1). The guide sleeve (2) has an annular oil groove (6) in the middle of its lower end. The guide sleeve (2) has upper buffer grooves (7) on both sides of its lower end. The upper buffer groove (7) has an upper connecting port (8) on the inner side of its upper end. The upper buffer groove (7) has an upper adjusting port (9) on the outer side of its upper end. An upper adjusting pipe (10) is fixedly connected to the outer side of the upper adjusting port (9). An upper adjusting bolt (11) is threadedly connected to the inner wall of the upper adjusting pipe (10). An upper adjusting nut (12) for locking and tightening the upper adjusting bolt (11) is threadedly connected to the outer curved surface of the upper adjusting bolt (11). An annular sealing sleeve (13) is fixedly installed on the outer curved surface of the lower end of the piston rod (3). The bottom of the cylinder body (1) A buffer seat (14) is fixedly installed. A cylindrical oil groove (15) is opened in the middle of the upper end. Lower buffer grooves (16) are opened on both sides of the upper end of the buffer seat (14). A lower connecting port (17) is opened on the inner side of the lower end of the lower buffer groove (16). A lower adjustment port (18) is opened on the outer side of the lower end of the lower buffer groove (16). A lower adjustment pipe (19) is fixedly connected to the outer side of the lower adjustment port (18). A lower adjustment bolt (21) is threadedly connected to the inner wall of the lower adjustment pipe (19). A lower adjustment nut (22) for locking and tightening the lower adjustment bolt (21) is threadedly connected to the outer curved surface of the lower adjustment bolt (21). A sealing column (23) is fixedly installed at the bottom of the piston rod (3).

2. The hydraulic cylinder guide sleeve buffer mechanism according to claim 1, characterized in that: The movable piston (20) is attached to the inner wall of the lower end of the cylinder (1), and the upper oil port (4) and the lower oil port (5) are respectively connected to the external hydraulic control pump through hydraulic oil pipes.

3. The hydraulic cylinder guide sleeve buffer mechanism according to claim 2, characterized in that: The inner side of the upper oil port (4) is connected to the upper end of the annular oil groove (6), and there are two upper buffer grooves (7), which are symmetrically distributed on both sides of the lower end of the guide sleeve (2).

4. The hydraulic cylinder guide sleeve buffer mechanism according to claim 3, characterized in that: The upper connecting port (8) extends into the annular oil groove (6) from the inside, and the upper adjusting port (9) extends outward to the outer side of the upper end of the cylinder body (1).

5. A hydraulic cylinder guide sleeve buffer mechanism according to claim 4, characterized in that: The inner wall of the upper adjusting tube (10) is provided with an internal thread, the inner side of the upper adjusting bolt (11) extends to the inside of the upper adjusting port (9), the upper end of the annular sealing sleeve (13) fits into the inner wall of the annular oil groove (6), and the upper end of the annular sealing sleeve (13) is provided with a rounded corner.

6. A hydraulic cylinder guide sleeve buffer mechanism according to claim 5, characterized in that: The inner side of the lower oil port (5) is connected to the lower end of the cylindrical oil groove (15), the inner side of the lower connecting port (17) extends into the interior of the cylindrical oil groove (15), the inner wall of the lower adjusting pipe (19) is provided with internal threads, and the lower adjusting bolt (21) extends into the interior of the lower adjusting port (18).

7. A hydraulic cylinder guide sleeve buffer mechanism according to claim 6, characterized in that: The outer curved surface of the sealing column (23) fits into the inner wall of the cylindrical oil groove (15), and the lower end of the sealing column (23) is provided with a rounded corner.

8. A hydraulic cylinder guide sleeve buffer mechanism according to claim 7, characterized in that: A positioning ring (24) is fixedly installed on the upper end of the buffer seat (14). A buffer spring (25) is fixedly installed on the inner side of the positioning ring (24). A buffer ring (26) is fixedly installed on the upper end of the buffer spring (25). The buffer ring (26) is movably connected to the lower inner wall of the cylinder body (1). A flow hole (27) for hydraulic oil flow is opened through the outer side of the buffer ring (26). There are several flow holes (27), which are symmetrically distributed on the outer side of the buffer ring (26).

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