Cylinder for lowering buffer stability and working method thereof

Abstract

The present invention discloses a stable oil cylinder with descending buffer and a working method thereof, comprising a cylinder cover, a cylinder body, a cylinder bottom, a piston rod, a piston, a sealing ring, and a steel back bearing. A hollow buffer shaft is provided on the inner side of the piston, the inner hole of the hollow buffer shaft corresponds to the oil port position on the cylinder bottom, a buffer sleeve is provided at the bottom of the piston, a limiting ring is provided at the front end of the hollow buffer shaft, a buffer spring matching the buffer sleeve is sleeved on the hollow buffer shaft, an oil passage is formed between the buffer sleeve and the hollow buffer shaft, and two bevels are provided on the outer surface of the hollow buffer shaft, namely a first bevel close to the limiting ring and a second bevel close to the cylinder bottom, when the buffer sleeve is located at the first bevel, the inlet of the oil passage is larger than the outlet, and when the buffer sleeve is located at the second bevel, the inlet of the oil passage is smaller than the outlet. The present invention enables the oil cylinder to steadily reduce its speed when it descends to the bottom quickly, can well protect the oil cylinder, improve the safety of use, has a clever and reasonable structure, is convenient to process, is easy to install, and has a good user experience.

Description

Technical Field

[0001] The invention relates to an oil cylinder, in particular to an oil cylinder with stable descending buffering and a working method thereof. Background Art

[0002] At present, the lifting cylinders used in transport trucks, forklifts and engineering vehicles are difficult to control when they are almost at the bottom, resulting in a lack of stability. Long-term use not only easily damages the cylinders and increases costs, but also poses a safety hazard. Summary of the Invention

[0003] In order to solve the defects and shortcomings of the above-mentioned prior art, the present invention provides a buffer assembly composed of a hollow buffer shaft, a buffer sleeve and a buffer spring to provide good buffering for the oil cylinder (piston) when it is about to descend to the bottom, so that the speed of the oil cylinder can be steadily reduced when it is about to descend to the bottom. It can not only protect the oil cylinder well and improve the safety of use, but also has an ingenious and reasonable structure, is easy to process, easy to install, and has a stable descending buffer and a working method for the oil cylinder, which has a good user experience.

[0004] The technical solution of the present invention is as follows: a descending buffer stable oil cylinder, comprising a cylinder head, a cylinder body, a cylinder bottom, a piston rod, a piston, a sealing ring between the piston and the cylinder body, and a steel back bearing between the piston rod and the cylinder head. A hollow buffer shaft is provided on the inner side of the piston, and the inner hole of the hollow buffer shaft corresponds to the oil port position on the cylinder bottom. A buffer sleeve is provided at the bottom of the piston to match the hollow buffer shaft, a limiting ring is provided at the front end of the hollow buffer shaft to match the buffer sleeve, and a buffer spring is provided on the hollow buffer shaft to match the buffer sleeve, and a buffer sleeve is provided A spring groove cooperates with the buffer spring, and the interior of the piston is provided with a buffer cavity that cooperates with the hollow buffer shaft. An oil passage is formed between the buffer sleeve and the hollow buffer shaft. The outer surface of the hollow buffer shaft is provided with two bevels, namely a first bevel close to the limit ring and a second bevel close to the bottom of the cylinder. When the buffer sleeve is located at the first bevel, the inlet of the oil passage is larger than the outlet. When the buffer sleeve is located at the second bevel, the inlet of the oil passage is smaller than the outlet, and the oil passage when the buffer sleeve is located at the first bevel is larger than the oil passage when the buffer sleeve is located at the second bevel.

[0005] The present invention adopts a buffer assembly consisting of a hollow buffer shaft, a buffer sleeve and a buffer spring to provide good buffering when the oil cylinder (piston) is about to descend to the bottom, so that the speed of the oil cylinder is steadily reduced when it is about to descend to the bottom. It can not only protect the oil cylinder well and improve the safety of use, but also has an ingenious and reasonable structure, convenient processing, easy installation, and a good user experience.

[0006] Preferably, a mounting ring is provided at one end of the piston, the mounting ring and the piston are integrally formed, a mounting cavity matching the mounting ring is provided at one end of the piston rod, and the mounting ring is inserted into the mounting cavity and limited by a first wire retaining ring.

[0007] This structure ensures the firmness and reliability of the installation of the piston and the piston rod, and ensures the stability and reliability of the piston rod's pushing and pulling of the piston.

[0008] Preferably, a mounting groove matching the buffer sleeve is provided on the inner side of the other end of the piston, the buffer sleeve is inserted into the mounting groove and limited by an elastic retaining ring through the hole, and a second steel wire retaining ring matching the buffer sleeve is provided on the inner side of the limiting ring.

[0009] This structure ensures the installation firmness and reliability of the buffer sleeve.

[0010] Preferably, a support ring and a baffle matching the sealing ring are further provided between the piston and the cylinder body, and the support ring is located in the middle of the outer ring of the piston.

[0011] This structure ensures the stability and reliability of the movement of the piston in the cylinder, while ensuring the sealing between the piston and the cylinder.

[0012] Preferably, the steel back bearing is located between the piston rod and the inner side of the cylinder head, and a dust ring is further provided between the piston rod and the outer side of the cylinder head.

[0013] This structure ensures the dust-proof effect of the oil cylinder.

[0014] Preferably, a spring seat cooperating with a buffer spring is provided at the bottom of the hollow buffer shaft, and the spring seat and the hollow buffer shaft are integrally formed.

[0015] This structure ensures the buffering effect of the buffer spring.

[0016] A working method for a hydraulic cylinder with stable descending buffering, when the hydraulic cylinder descends to the beginning of buffering, the rear end of the hollow buffer shaft presses against the cylinder bottom, so that the inner hole of the hollow buffer shaft is connected with the oil port on the cylinder bottom. At this time, the buffer sleeve is located at the first oblique angle of the hollow buffer shaft, and the hydraulic oil flows into the piston cavity through the oil passage between the hollow buffer shaft and the buffer sleeve, and then flows to the oil port on the cylinder bottom through the inner hole of the hollow buffer shaft. At this time, the oil passage is larger, and its inlet is larger than the outlet, which increases the flow rate, makes the speed drop smoothly, and avoids a sense of pause; when the buffer sleeve reaches the second oblique angle of the hollow buffer shaft, the oil passage becomes smaller, and its inlet is smaller than the outlet, the flow rate begins to decrease, and the speed decreases steadily. When the hydraulic cylinder descends to the bottom, the oil passage is the smallest, the descending speed is the lowest, and there is no sense of pause during the entire buffering process.

[0017] The present invention adopts a buffer assembly consisting of a hollow buffer shaft, a buffer sleeve and a buffer spring to provide good buffering when the oil cylinder (piston) is about to descend to the bottom, so that the speed of the oil cylinder is steadily reduced when it is about to descend to the bottom. It can not only protect the oil cylinder well and improve the safety of use, but also has an ingenious and reasonable structure, convenient processing, easy installation, and a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of the buffer starting position of the present invention;

[0019] Figure 2 This is a structural schematic diagram of the buffer end position of the present invention;

[0020] Figure 3 for Figure 1 An enlarged schematic diagram of point I in the middle;

[0021] In the figure, 1. piston rod, 2. dust ring, 3. steel back bearing, 4. cylinder head, 5. cylinder body, 6. piston, 7. first steel wire retaining ring, 8. buffer sleeve, 9. support ring, 10. baffle, 11. sealing ring, 12. elastic retaining ring for hole, 13. hollow buffer shaft, 14. buffer spring, 15. second steel wire retaining ring, 16. cylinder bottom, 17. oil port, 18. limit ring, 19. spring groove, 20. buffer cavity, 21. first bevel, 22. second bevel, 23. oil passage, 24. mounting ring, 25. mounting cavity, 26. mounting groove, 27. spring seat. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings, but this does not limit the scope of protection of the present invention.

[0023] like Figure 1-3As shown, a descending buffering and stable oil cylinder includes a cylinder head 4, a cylinder body 5, a cylinder bottom 16, a piston rod 1, a piston 6, a sealing ring 11 between the piston 6 and the cylinder body 5, and a steel back bearing 3 between the piston rod 1 and the cylinder head 4. A hollow buffer shaft 13 is provided on the inner side of the piston 6, and the inner hole of the hollow buffer shaft 13 corresponds to the position of the oil port 17 on the cylinder bottom 16. A buffer sleeve 8 is provided at the bottom of the piston 6 to match the hollow buffer shaft 13, and a limiting ring 18 is provided at the front end of the hollow buffer shaft 13 to match the buffer sleeve 8, and a buffer spring 14 is sleeved on the hollow buffer shaft 13 to match the buffer sleeve 8, and a spring groove 19 is provided on the buffer sleeve 8 to match the buffer spring 14. A buffer cavity 20 is provided inside the piston 6 to match the hollow buffer shaft 13, and the buffer sleeve 8 An oil passage 23 is formed between the piston 6 and the hollow buffer shaft 13. The outer surface of the hollow buffer shaft 13 is provided with two bevels: a first bevel 21 near the retaining ring 18 and a second bevel 22 near the cylinder bottom 16. When the buffer sleeve 8 is at the first bevel 21, the inlet of the oil passage is larger than the outlet. When the buffer sleeve 8 is at the second bevel 22, the inlet of the oil passage is smaller than the outlet. Furthermore, the oil passage when the buffer sleeve 8 is at the first bevel 21 is larger than when the buffer sleeve 8 is at the second bevel 22. A mounting ring 24 is provided at one end of the piston 6. The mounting ring 24 and the piston 6 are integrally formed. A mounting cavity 25 is provided at one end of the piston rod 1 for mating with the mounting ring 24. The mounting ring 24 is inserted into the mounting cavity 25 and is retained in place by the first wire retaining ring 7. A mounting groove 26 is provided on the inside of the other end of the piston 6 for mating with the buffer sleeve 8. The buffer sleeve 8 is inserted into the mounting groove 26 and retained in place by the elastic retaining ring 12 through the hole. The retaining ring 18 is provided on the inside with a second wire retaining ring 15 for mating with the buffer sleeve 8. A support ring 9 and a baffle 10, which mates with a sealing ring 11, are positioned between the piston 6 and the cylinder body 16. The support ring 9 is located in the middle of the outer ring of the piston 6. A steel-backed bearing 3 is positioned between the piston rod 1 and the inner side of the cylinder head 4. A dust seal 2 is also positioned between the outer sides of the piston rod 1 and the cylinder head 4. A spring seat 27, which mates with the buffer spring 14, is provided at the bottom of the hollow buffer shaft 13. The spring seat 27 is integrally formed with the hollow buffer shaft 13.

[0024] A working method for a hydraulic cylinder with stable descending buffering, when the hydraulic cylinder descends to the beginning of buffering, the rear end of the hollow buffer shaft presses against the cylinder bottom, so that the inner hole of the hollow buffer shaft is connected with the oil port on the cylinder bottom. At this time, the buffer sleeve is located at the first oblique angle of the hollow buffer shaft, and the hydraulic oil flows into the piston cavity through the oil passage between the hollow buffer shaft and the buffer sleeve, and then flows to the oil port on the cylinder bottom through the inner hole of the hollow buffer shaft. At this time, the oil passage is larger, and its inlet is larger than the outlet, which increases the flow rate, makes the speed drop smoothly, and avoids a sense of pause; when the buffer sleeve reaches the second oblique angle of the hollow buffer shaft, the oil passage becomes smaller, and its inlet is smaller than the outlet, the flow rate begins to decrease, and the speed decreases steadily. When the hydraulic cylinder descends to the bottom, the oil passage is the smallest, the descending speed is the lowest, and there is no sense of pause during the entire buffering process.

[0025] The present invention controls flow rate changes through two bevel angles on the hollow buffer shaft, and can also adjust the required oil cylinder descending speed by adjusting the size of the bevel angle.

[0026] The present invention adopts a buffer assembly consisting of a hollow buffer shaft, a buffer sleeve and a buffer spring to provide good buffering when the oil cylinder (piston) is about to descend to the bottom, so that the speed of the oil cylinder is steadily reduced when it is about to descend to the bottom. It can not only protect the oil cylinder well and improve the safety of use, but also has an ingenious and reasonable structure, easy processing and easy installation, and provides a good experience when used on transport trucks, forklifts and engineering vehicles.

Claims

1. A working method of a descending buffering and stable oil cylinder, the oil cylinder comprising a cylinder head, a cylinder body, a cylinder bottom, a piston rod, a piston, a sealing ring between the piston and the cylinder body, and a steel back bearing between the piston rod and the cylinder head, characterized in that: A hollow buffer shaft is provided on the inner side of the piston, and the inner hole of the hollow buffer shaft corresponds to the oil port position on the bottom of the cylinder, a buffer sleeve matching the hollow buffer shaft is provided on the bottom of the piston, a limiting ring matching the buffer sleeve is provided at the front end of the hollow buffer shaft, and a buffer spring matching the buffer sleeve is sleeved on the hollow buffer shaft, and a spring groove matching the buffer spring is provided on the buffer sleeve, and a buffer cavity matching the hollow buffer shaft is provided inside the piston, and an oil passage is formed between the buffer sleeve and the hollow buffer shaft, and the outer surface of the hollow buffer shaft is provided with two bevels, which are a first bevel close to the limiting ring and a second bevel close to the bottom of the cylinder, when the buffer sleeve is located at the first bevel, the inlet of the oil passage is larger than the outlet, and when the buffer sleeve is located at the second bevel, the inlet of the oil passage is smaller than the outlet, and the oil passage when the buffer sleeve is located at the first bevel is larger than the oil passage when the buffer sleeve is located at the second bevel; The working method of the oil cylinder is as follows: when the oil cylinder descends to the beginning of buffering, the rear end of the hollow buffer shaft presses against the bottom of the cylinder, so that the inner hole of the hollow buffer shaft is connected with the oil port on the bottom of the cylinder. At this time, the buffer sleeve is located at the first oblique angle of the hollow buffer shaft, and the hydraulic oil flows into the inner cavity of the piston through the oil passage between the hollow buffer shaft and the buffer sleeve, and then flows to the oil port at the bottom of the cylinder through the inner hole of the hollow buffer shaft. At this time, the inlet of the oil passage is larger than the outlet, increasing the flow rate, making the speed drop smoothly, and avoiding a sense of pause; when the buffer sleeve reaches the second oblique angle of the hollow buffer shaft, the oil passage becomes smaller, and its inlet is smaller than the outlet, the flow rate begins to decrease, and the speed decreases steadily. When the oil cylinder drops to the bottom, the oil passage is the smallest and the descending speed is the lowest. There is no sense of pause in the entire buffering process.

2. The working method of the descent buffering and stabilizing oil cylinder according to claim 1, characterized in that: One end of the piston is provided with a mounting ring, the mounting ring and the piston are integrally formed, one end of the piston rod is provided with a mounting cavity matching the mounting ring, and the mounting ring is inserted into the mounting cavity and limited by a first steel wire retaining ring.

3. The working method of the descent buffering and stabilizing oil cylinder according to claim 2, characterized in that: The other end of the piston is provided with a mounting groove on the inner side thereof to match the buffer sleeve. The buffer sleeve is inserted into the mounting groove and is limited by an elastic retaining ring through a hole. A second steel wire retaining ring is provided on the inner side of the limiting ring to match the buffer sleeve.

4. The working method of the descent buffering and stabilizing oil cylinder according to claim 1, characterized in that: A support ring and a baffle matching the sealing ring are also provided between the piston and the cylinder body, and the support ring is located in the middle of the outer ring of the piston.

5. The working method of the descent buffering and stabilizing oil cylinder according to claim 1, characterized in that: The steel back bearing is located between the piston rod and the inner side of the cylinder cover, and a dust ring is also provided between the piston rod and the outer side of the cylinder cover.

6. The working method of the descent buffering and stabilizing oil cylinder according to claim 1, characterized in that: A spring seat matching the buffer spring is provided at the bottom of the hollow buffer shaft, and the spring seat and the hollow buffer shaft are integrally formed.

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