Air cylinder buffering device with adjustable stroke
By designing a buffer device in the cylinder, using the combined structure of the throttle hole and the buffer chamber, the problem of high impact force of the piston rod during stroke retraction is solved, and the effect of slowing the piston rod movement, reducing noise and extending the cylinder life is achieved.
Patent Information
- Application Number
- CN202421287519.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The existing stroke adjustable cylinders are retracted when the piston and piston rod directly hit the end of the cylinder, resulting in high impact force, high noise and damage to the cylinder.
An adjustable stroke cylinder buffer device is designed, including a cylinder body, a piston rod, a stroke adjuster and a buffer ring. Through the design of the throttle hole and the buffer air chamber, when the piston rod is running to the end of the stroke, the buffer ring and the buffer seal ring are sealed, adjusting the gas in the air chamber to enter the buffer air chamber through the throttle hole, generating air pressure to slow down the movement of the piston rod.
Effectively reduces the end speed of the piston rod stroke, reduces impact force, reduces noise, and extends the service life of the cylinder.
Smart Images
Figure CN222479114U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of cylinders, and in particular to an adjustable stroke cylinder buffer device. Background Art
[0002] In order to adapt to different usage scenarios, sometimes it is necessary to use a cylinder with adjustable stroke. In existing adjustable stroke cylinders, the cylinder stroke is mostly adjusted by a screw structure. After the cylinder stroke of this type of cylinder is adjusted, during the working retraction stroke, the piston and piston rod directly hit the end structure of the cylinder, which is likely to cause problems such as large impact force, loud noise, and cylinder damage. Utility Model Content
[0003] The purpose of the present application is to provide an adjustable stroke cylinder buffer device, which can effectively slow down the movement speed of the piston rod, reduce the impact force, reduce noise, and extend the service life of the cylinder when the piston rod in the retracted stroke adjustable cylinder is retracted to the end of the stroke.
[0004] The technical solution of the present application provides an adjustable stroke cylinder buffer device, comprising: a cylinder body, the cylinder body comprising: a cylinder barrel and an end cover located at the end of the cylinder barrel, the end cover being provided with an air hole connected to the outside; a piston rod, the piston rod being slidably arranged in the cylinder barrel, and a piston and a buffer ring being arranged on the side of the piston rod; a stroke adjusting member, the stroke adjusting member being located in the cylinder barrel, the stroke adjusting member being provided with a connected throttle hole and a buffer air chamber, a buffer sealing ring being embedded on the inner wall of the buffer air chamber, and the buffer air chamber being connected to the air hole; when the piston rod moves toward the direction approaching the end cover until the outer side surface of the buffer ring is sealed and abutted against the buffer sealing ring, a closed adjusting air chamber is defined between the piston and the stroke adjusting member, and the adjusting air chamber is connected to the throttle hole through the gap between the cylinder barrel and the stroke adjusting member.
[0005] Optionally, the adjustable stroke cylinder buffer device also includes a limit piece installed on the piston rod, and the buffer ring includes a first limit surface and a second limit surface arranged opposite to each other along the axial direction of the piston rod, the first limit surface abuts against the piston, and the second limit surface abuts against the limit piece.
[0006] Optionally, the buffer ring includes a mounting hole and a limit hole connected along the axial direction of the piston rod, the inner diameter of the limit hole is larger than the mounting hole, the limit hole and the mounting hole define the second limit surface at the connection, the limit member abuts against the second limit surface, and the limit member is at least partially located in the limit hole.
[0007] Optionally, the limiting member is threadedly connected to the piston rod.
[0008] Optionally, the outer diameter of one end of the buffer ring facing the end cover gradually decreases towards the end cover.
[0009] Optionally, an elastic buffer pad is arranged on the end surface of the piston facing the stroke adjusting member.
[0010] Optionally, the adjustable stroke cylinder buffer device further comprises an adjusting stud, wherein the adjusting stud is threadedly mounted in a threaded hole of the end cover, one end of the adjusting stud abuts against the stroke adjusting member along the axial direction of the piston rod and is movable and adjustable along the axial direction.
[0011] Optionally, an air path connecting the buffer air chamber and the air hole is opened on the adjusting screw.
[0012] Optionally, a threaded hole is provided on the end cover, and one end of the adjusting stud is drivingly connected to the stroke adjusting member and is movable along the axial direction of the piston rod.
[0013] Optionally, the adjustable stroke cylinder buffer device further comprises a nut, the adjusting stud is threadedly connected to the nut, and a sealing gasket is sealingly arranged between the end cover and the nut.
[0014] The above technical solution has the following beneficial effects:
[0015] The adjustable stroke cylinder buffer device provided by the present application, when the piston rod runs to the end of the stroke, the buffer ring moves to fit with the buffer sealing ring, the end of the piston rod is sealed at the opening of the buffer air chamber, and the gas in the adjustment air chamber can only enter the throttle hole through the gap between the cylinder barrel and the stroke adjustment member and enter the buffer air chamber through the throttle hole, and then be discharged to the outside through the air hole on the end cover. In this process, due to the throttling effect of the throttle hole, the gas in the buffer air chamber cannot be discharged quickly, and a certain air pressure will be generated, thereby slowing down the movement of the piston rod, thereby achieving a buffering effect, effectively reducing the speed at the end of the piston rod stroke, reducing the impact force of the piston rod, reducing noise, and extending the service life of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Schematic diagram of the structure of an adjustable stroke cylinder buffer device in one embodiment of the present application.
[0017] Figure 2 This is a structural schematic diagram of an elastic buffer pad provided on the piston of an adjustable stroke cylinder buffer device in one embodiment of the present application.
[0018] Reference Numbers
[0019] 1-Cylinder body.
[0020] 2-Cylinder barrel.
[0021] 3-piston rod, 301-limiting piece.
[0022] 4-piston, 401-elastic buffer pad, 402-adjusting air chamber, 403-piston sealing ring.
[0023] 5- Buffer ring.
[0024] 6-stroke adjustment member, 601-buffer sealing ring, 602-sealing ring, 603-throttle hole, 604-buffer air chamber.
[0025] 7-end cap, 701-air hole.
[0026] 8-adjusting stud, 801-sealing gasket, 802-air path, 803-milling plane.
[0027] 9-Nut. DETAILED DESCRIPTION
[0028] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.
[0029] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a variety of structural modes and implementation modes can be replaced by those skilled in the art. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction on the technical solution of the utility model.
[0030] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.
[0031] The present application provides an adjustable stroke cylinder buffer device, comprising: a cylinder body 1, wherein the cylinder body 1 comprises: a cylinder barrel 2 and an end cover 7 located at the end of the cylinder barrel 2, a piston rod 3 and a stroke adjusting member 6.
[0032] Please refer to Figure 1 and Figure 2, an air hole 701 connected to the outside is opened on the end cover 7; the piston rod 3 is slidably arranged in the cylinder barrel 2, and a piston 4 and a buffer ring 5 are arranged on the side of the piston rod 3; the stroke adjustment member 6 is located in the cylinder barrel 2, and a throttle hole 603 and a buffer air chamber 604 that are connected are provided on the stroke adjustment member 6, and a buffer sealing ring 601 is embedded on the inner wall of the buffer air chamber 604, and the buffer air chamber 604 is connected to the air hole 701; when the piston rod 3 moves toward the direction close to the end cover 7 until the outer side surface of the buffer ring 5 is sealed and abutted against the buffer sealing ring 601, a closed regulating air chamber 402 is defined between the piston 4 and the stroke adjustment member 6, and the regulating air chamber 402 is connected to the throttle hole 603 through the gap between the cylinder barrel 2 and the stroke adjustment member 6.
[0033] The throttling hole 603 in the embodiment of the present application can be a small hole with an inner diameter between 0.5 mm and 2 mm, or a hole with a diameter greater than 4 mm and a flow limiting element arranged in the hole to achieve a throttling effect. Figure 1 As shown, a piston sealing ring 403 is provided on the outer side surface of the piston 4 to achieve a sealing effect between the piston 4 and the cylinder 2, and a sealing ring 602 is provided on the outer side surface of the stroke adjustment member 6. The sealing ring 602 is located between the throttle hole 603 and the end cover 7 to prevent gas from escaping from between the stroke adjustment member 6 and the cylinder 2.
[0034] The adjustable stroke cylinder buffer device provided in the embodiment of the present application is such that when the piston rod 3 runs to the end of the stroke, the buffer ring 5 moves to fit with the buffer seal ring 601, and the end of the piston rod 3 is sealed at the opening of the buffer air chamber 604. The gas in the adjustment air chamber 402 can only enter the throttle hole 603 through the gap between the cylinder barrel 2 and the stroke adjustment member 6, and enter the buffer air chamber 604 through the throttle hole 603, and then be discharged to the outside through the air hole 701 on the end cover 7. In this process, due to the throttling effect of the throttle hole 603, the gas in the buffer air chamber 604 cannot be discharged quickly, and a certain air pressure will be generated, thereby slowing down the movement of the piston rod 3, thereby achieving a buffering effect, effectively reducing the speed of the piston rod 3 at the end of the stroke, reducing the impact force of the piston rod 3, reducing noise, and extending the service life of the cylinder.
[0035] As an optional embodiment, the adjustable stroke cylinder buffer device further includes a stopper 301 mounted on the piston rod 3, and the buffer ring 5 includes a first stopper surface and a second stopper surface that are relatively arranged along the axial direction of the piston rod 3, the first stopper surface abuts against the piston 4, and the second stopper surface abuts against the stopper 301. The stopper 301 in the embodiment of the present application plays a role of axially limiting the buffer ring 5, ensuring the structural stability of the buffer ring 5 on the piston rod 3.
[0036] As an optional embodiment, the buffer ring 5 includes a mounting hole and a limiting hole that are connected along the axial direction of the piston rod 3, the inner diameter of the limiting hole is larger than the mounting hole, the limiting hole and the mounting hole define the second limiting surface at the connection, the limiting member 301 abuts on the second limiting surface, and the limiting member 301 is at least partially located in the limiting hole. The second limiting surface in the embodiment of the present application forms a step structure in the buffer ring 5, the limiting member 301 abuts on the second limiting surface and is at least partially located in the limiting hole, which can not only limit the buffer ring 5 in the axial direction, but also support the buffer ring 5 in the radial direction.
[0037] As an optional embodiment, the stopper 301 is threadedly connected to the piston rod 3. The threaded connection facilitates the disassembly and adjustment of the position of the stopper 301.
[0038] As an optional embodiment, the outer diameter of the end of the buffer ring 5 facing the end cover 7 gradually decreases toward the end cover 7. Figure 1 to Figure 2 As shown, the outer diameter of the end of the buffer ring 5 facing the end cover 7 gradually decreases, which is beneficial for the end of the buffer ring 5 to smoothly pass through the buffer sealing ring 601 and prevent the buffer sealing ring 601 from being scratched.
[0039] As an optional embodiment, an elastic buffer pad 401 is provided on the end surface of the piston 4 facing the stroke adjustment member 6. Figure 2 As shown, the elastic buffer pad 401 can be a sheet-like rubber piece, which is combined with the stroke adjustment piece 6 to form a combination of air buffer and rubber buffer to enhance the buffer effect.
[0040] As an optional embodiment, the adjustable stroke cylinder buffer device further includes an adjusting stud 8, the adjusting stud 8 is threadedly mounted in the threaded hole of the end cover 7, one end of the adjusting stud 8 is drivingly connected to the stroke adjusting member 6 and is movable along the axial direction of the piston rod 3. The end of the adjusting stud 8 can be fixedly mounted on the stroke adjusting member 6. In the embodiment of the present application, the stroke adjusting member 6 is driven by the adjusting stud 8 to achieve axial movement relative to the end cover 7, thereby achieving adjustable stroke of the piston rod 3.
[0041] As an optional embodiment, the adjusting screw is provided with an air path 802 connecting the buffer air chamber 604 and the air hole 701. Figure 1 to Figure 2 As shown, the path of the gas path 802 is L-shaped, a sunken circular hole is opened on the end face of the end cover 7, and an air outlet hole is opened on the side of the end cover 7. The circular hole is connected with the air outlet hole to form a path of the air hole 701. The two ends of the gas path 802 are respectively connected to the buffer air chamber 604 and the air hole 701 to achieve the connection between the buffer air chamber 604 and the air hole 701.
[0042] As an optional embodiment, a threaded hole is provided on the end cover 7, and the adjusting stud 8 is threadedly connected in the threaded hole of the end cover 7. The threaded connection allows the adjusting stud 8 to rotate in the threaded hole of the end cover 7, and when screwed in, the stroke adjusting member 6 is driven to move in a direction away from the end cover 7, and when screwed out, the stroke adjusting member 6 is driven to move in a direction close to the end cover 7. A milling plane 803 may be provided on the outer end surface of the adjusting stud 8 to facilitate the clamping of the adjustment tool and facilitate the screwing in or screwing out of the adjusting stud 8.
[0043] As an optional embodiment, the adjustable stroke cylinder buffer device further includes a nut 9, the adjusting stud 8 is threadedly connected to the nut 9, and the sealing gasket 801 is sealingly arranged between the end cover 7 and the nut 9. The nut 9 in the embodiment of the present application plays a role of locking and fixing the adjusting screw to limit the position of the piston rod 3 and the piston 4 retracting to the end of the stroke. The sealing gasket 801 is sealingly arranged on the outside of the end cover 7, and plays a role of sealing the threaded hole on the end cover 7 to prevent the airflow from escaping from the threaded hole on the end cover 7.
[0044] As needed, the above technical solutions can be combined to achieve the best technical effect.
[0045] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.
Claims
1. An adjustable stroke cylinder buffer device, characterized in that: include: A cylinder body, the cylinder body comprising: A cylinder and an end cover at the end of the cylinder, wherein the end cover is provided with an air hole connected to the outside; A piston rod, the piston rod is slidably disposed in the cylinder, and a piston and a buffer ring are disposed on the side of the piston rod; A stroke adjusting member, the stroke adjusting member is located in the cylinder, the stroke adjusting member is provided with a throttle hole and a buffer air chamber which are connected, a buffer sealing ring is embedded on the inner wall of the buffer air chamber, and the buffer air chamber is connected with the air hole; When the piston rod moves toward the end cover until the outer side surface of the buffer ring is in sealing contact with the buffer sealing ring, a closed regulating air chamber is defined between the piston and the stroke adjusting member, and the regulating air chamber is connected to the throttling hole through the gap between the cylinder barrel and the stroke adjusting member.
2. The adjustable stroke cylinder buffer device according to claim 1, characterized in that: An elastic buffer pad is arranged on the end surface of the piston facing the stroke adjusting member.
3. The adjustable stroke cylinder buffer device according to claim 1, characterized in that: The adjustable stroke cylinder buffer device also includes an adjusting stud, which is threadedly installed in the threaded hole of the end cover. One end of the adjusting stud is drivingly connected to the stroke adjusting member and is movable along the axial direction of the piston rod.
4. The adjustable stroke cylinder buffer device according to claim 3, characterized in that: The adjusting screw is provided with an air path connecting the buffer air chamber and the air hole.
5. The adjustable stroke cylinder buffer device according to claim 4, characterized in that: The end cover is provided with a threaded hole, and the adjusting stud is threadedly connected in the threaded hole of the end cover.
6. The adjustable stroke cylinder buffer device according to claim 5, characterized in that: The adjustable stroke cylinder buffer device also includes a nut, the adjusting stud is threadedly connected to the nut, and a sealing gasket is sealingly arranged between the end cover and the nut.
7. The adjustable stroke cylinder buffer device according to claim 1, characterized in that: The adjustable stroke cylinder buffer device also includes a limit piece installed on the piston rod, and the buffer ring includes a first limit surface and a second limit surface arranged opposite to each other along the axial direction of the piston rod, the first limit surface abuts against the piston, and the second limit surface abuts against the limit piece.
8. The adjustable stroke cylinder buffer device according to claim 7, characterized in that: The buffer ring includes a mounting hole and a limiting hole which are connected along the axial direction of the piston rod. The inner diameter of the limiting hole is larger than the mounting hole. The limiting hole and the mounting hole define the second limiting surface at the connection. The limiting member abuts against the second limiting surface. The limiting member is at least partially located in the limiting hole.
9. The adjustable stroke cylinder buffer device according to claim 7, characterized in that: The limiting member is threadedly connected to the piston rod.
10. The adjustable stroke cylinder buffer device according to claim 2, characterized in that: The outer diameter of one end of the buffer ring facing the end cover gradually decreases toward the direction approaching the end cover.