Multi-stage throttling buffer oil cylinder
By designing a multi-stage throttling buffer cylinder, and utilizing the axial buffer hole and radial throttling hole at the bottom of the cylinder, combined with a throttling plate and a sealing ring, multi-stage buffering is achieved. This solves the problems of limited buffering effect and high pressure resistance in existing technologies, ensuring the safety and stability of the system.
Patent Information
- Application Number
- CN202520295976.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Existing buffer structures can only achieve single-level buffering, with limited buffering effect, and subject the hydraulic system to high pressure, which is not conducive to the long-term safe operation of the system.
A multi-stage throttling buffer cylinder is designed. Through the cooperation of the axial buffer hole and the radial throttling hole at the bottom of the cylinder, the buffering is achieved in stages. Combined with the use of throttling plates and sealing rings, the impact force of the piston rod descending is reduced in stages.
This achieves a multi-stage buffering effect, reducing the instantaneous impact during the piston rod's descent, preventing the hydraulic system from bearing high pressure, and ensuring the system's long-term safe operation.
Smart Images
Figure CN223563160U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a throttling buffer oil cylinder, in particular to a self-retracting multistage throttling buffer oil cylinder. BACKGROUND
[0002] The piston rod of the lifting oil cylinder for the cutter suction dredger or the self-unloading truck is retracted by the dead weight of the load, and a buffer structure is arranged to prevent the instantaneous impact of the retracted end of the piston rod, wherein the existing buffer structure usually adopts a one-way throttling device arranged in the extension cavity oil port, but only one-stage buffer can be realized, the buffer effect is limited, and the hydraulic system bears high pressure, which is not conducive to the long-term safe operation of the system. SUMMARY
[0003] The utility model aims at the above-mentioned insufficient of prior art, provides a multistage throttling buffer oil cylinder, which can realize step-by-step buffer, not only has good buffer effect, but also avoids that the hydraulic system bears high pressure, which is conducive to the long-term safe operation of the system.
[0004] To achieve the above-mentioned purpose, the multistage throttling buffer oil cylinder of the utility model, including cylinder bottom, cylinder barrel, guide sleeve, piston rod and piston, characterized by that the cylinder bottom is provided with an extension cavity oil port, the front end of the cylinder bottom is located in the cylinder barrel, the outer circle of the front end of the cylinder bottom is arranged in a gap with the inner circle of the cylinder barrel, the front end of the cylinder bottom is internally provided with an axial buffer hole connected with the extension cavity oil port, and the rear end of the piston rod is fixedly connected with a buffer shaft matched with the axial buffer hole; the front end of the cylinder bottom is internally provided with a plurality of radial throttling holes communicating the outer circle thereof with the axial buffer hole.
[0005] In work, when the piston rod descends, the buffer shaft enters the axial buffer hole to start compressing oil and slow down, at this time, the radial throttling holes continue to return oil, the instantaneous impact is small, when the buffer shaft continues to enter the axial buffer hole, the radial throttling holes are slowly closed, the speed continues to slow down, two-stage throttling is realized, through step-by-step buffer, not only the buffer effect is good, but also the buffer of high pressure is limited in the cylinder bottom, the hydraulic system avoids bearing high pressure, which is conducive to the long-term safe operation of the system;
[0006] As a further improvement of the utility model, the front end of the cylinder bottom is internally provided with a throttling oil way communicating the axial buffer hole with the front end face thereof, the end of the throttling oil way is located on the axial rear side of the end of the buffer shaft; a throttling plate axially sliding in the throttling oil way is arranged, the throttling plate is provided with a plurality of throttling through holes, a baffle fixedly arranged in the throttling oil way on the front side of the throttling plate is arranged, the baffle is provided with a center hole, the sectional area of the center hole is greater than the sum of the sectional areas of all the throttling through holes; a sealing ring is arranged in the inner circle of the axial buffer hole between the end of the throttling oil way and the axial rear side of all the radial throttling holes; when the buffer shaft continues to enter and passes through the sealing ring, the axial buffer hole and the radial throttling holes are all sealed, at this time, the remaining part of the oil all returns through the throttling plate, three-stage buffer is realized, which is conducive to reducing the instantaneous impact in the descending process of the piston rod and avoiding causing violent vibration;
[0007] As a further improvement of this utility model, the piston is provided with an oil passage hole connecting its two end faces; when the piston rod descends, some oil can be discharged to the upper chamber of the piston, further improving the buffering effect.
[0008] In summary, this invention can achieve step-by-step buffering, which not only provides good buffering effect but also avoids the hydraulic system from bearing high pressure, thus contributing to the long-term safe operation of the system. Attached Figure Description
[0009] Figure 1 This is a front view of an embodiment of the present utility model.
[0010] Figure 2 for Figure 1 A magnified view of part A. Detailed Implementation
[0011] The present invention will now be described in further detail with reference to the accompanying drawings.
[0012] like Figure 1 , Figure 2 As shown, the multi-stage throttling buffer cylinder of this embodiment includes a cylinder bottom 1, a cylinder barrel 2, a guide sleeve 3, a piston rod 4, and a piston 5. The cylinder bottom 1 is provided with an extension port 6, and the front end of the cylinder bottom 1 is located inside the cylinder barrel 2. The outer circle of the front end of the cylinder bottom 1 is spaced apart from the inner circle of the cylinder barrel. An axial buffer hole 7 connected to the extension port 6 is provided inside the front end of the cylinder bottom 1. A buffer shaft 8 that mates with the axial buffer hole 7 is integrally fixed to the rear end of the piston rod 4. Several radial throttling holes 9 are provided inside the front end of the cylinder bottom 1, connecting its outer circle and the axial buffer hole 7. The front end of the cylinder bottom 1 is provided with a connection between the axial buffer hole 7 and its front end face. The throttling oil passage 10 has its end located on the axial rear side of the buffer shaft 8. A throttling plate 11 is axially sliding inside the throttling oil passage 10. The throttling plate 11 has several throttling holes 12. A baffle 13 is threadedly fixed inside the throttling oil passage on the front side of the throttling plate 11. The baffle 13 has a central hole 14, and the cross-sectional area of the central hole 14 is greater than the sum of the cross-sectional areas of all the throttling holes 12. A sealing ring 15 is provided in the inner circle of the axial buffer hole between the end of the throttling oil passage 10 and the axial rear side of all the radial throttling holes 9. An oil passage 16 is provided inside the piston 5, connecting its two end faces.
[0013] In work, the piston rod 4 is extended by oil inlet 6; after use, when the piston rod 4 is lowered due to the weight of the load, the buffer shaft 8 enters the axial buffer hole 7 to start compressing oil, and the speed is reduced, at this time, the radial throttle hole 9 and the throttle plate 11 continue to return oil, part of the oil is discharged to the upper chamber of the piston through the oil hole 16, the instantaneous impact is small, when the buffer shaft 8 continues to enter the axial buffer hole 7, the radial throttle hole 7 is slowly closed, the speed continues to slow down, and two-stage throttling is realized; when the buffer shaft 8 continues to enter and passes through the sealing ring 15, the axial buffer hole 7 and the radial throttle hole 9 are completely sealed, at this time, the remaining part of the oil is completely returned through the throttle plate 11, and three-stage buffering is realized; through step-by-step buffering, the instantaneous impact in the process of lowering the piston rod is reduced, and violent vibration is avoided; not only the buffering effect is good, but also the high-pressure buffering is limited in the cylinder bottom, the hydraulic system is prevented from bearing high pressure, and the long-term safe operation of the system is facilitated.
Claims
1. A multi-stage throttling cushion cylinder, comprising a cylinder bottom, a cylinder barrel, a guide sleeve, a piston rod and a piston; characterized in that The cylinder bottom is provided with an extension cavity oil port, the front end of the cylinder bottom is located in the cylinder barrel, the outer circle of the front end of the cylinder bottom is arranged in a gap with the inner circle of the cylinder barrel, the front end of the cylinder bottom is internally provided with an axial buffer hole connected with the extension cavity oil port, and the rear end of the piston rod is fixedly connected with a buffer shaft matched with the axial buffer hole; the front end of the cylinder bottom is internally provided with a plurality of radial throttle holes communicating the outer circle thereof with the axial buffer hole.
2. The multi-stage throttling cushion cylinder of claim 1, wherein The front end of the cylinder bottom is internally provided with a throttle oil path communicating the axial buffer hole with the front end face thereof, the end of the throttle oil path is located on the axial rear side of the end of the buffer shaft; a throttle plate is axially slidably arranged in the throttle oil path, the throttle plate is provided with a plurality of throttle through holes, a baffle is fixedly arranged in the throttle oil path on the front side of the throttle plate, the baffle is provided with a central hole, the sectional area of the central hole is greater than the sum of the sectional areas of all the throttle through holes; a sealing ring is arranged on the inner circle of the axial buffer hole between the end of the throttle oil path and the axial rear side of all the radial throttle holes.
3. A multi-stage throttling cushion cylinder as claimed in claim 1 or 2, characterized in that The piston is internally provided with an oil passing hole communicating the two end faces thereof.