CN222479114U - Stroke-adjustable cylinder buffer device - Google Patents

Abstract

The application discloses a stroke-adjustable cylinder buffer device. The cylinder body comprises a cylinder barrel and an end cover, wherein an air hole is formed in the end cover, a piston rod is arranged in the cylinder barrel in a sliding mode, a piston and a buffer ring are arranged on the side face of the piston rod, a stroke adjusting piece is arranged in the cylinder barrel, an orifice and a buffer air chamber which are communicated are formed in the stroke adjusting piece, a buffer sealing ring is embedded in the inner wall of the buffer air chamber, the buffer air chamber is communicated with the air hole, and when the piston rod moves to the outer side face of the buffer ring, which is close to the end cover, to be in sealing abutting joint with the buffer sealing ring, a closed adjusting air chamber is defined between the piston and the stroke adjusting piece, and the adjusting air chamber is communicated with the orifice through a hole between the cylinder barrel and the stroke adjusting piece. According to the stroke-adjustable cylinder buffer device, when the piston rod is retracted to the stroke end in the stroke-adjustable cylinder, the movement speed of the piston rod can be effectively slowed down, the impact force is reduced, the noise is reduced, and the service life of the cylinder is prolonged.

Description

Stroke-adjustable cylinder buffer device

Technical Field

The application relates to the technical field of cylinders, in particular to a stroke-adjustable cylinder buffer device.

Background

In order to accommodate different usage scenarios, it is sometimes necessary to use a stroke adjustable cylinder. In the existing stroke-adjustable air cylinder, the stroke of the air cylinder is mostly adjusted through a screw structure. After the cylinder stroke is adjusted, in the working retraction stroke, the piston and the piston rod directly impact the end structure of the cylinder, so that the problems of large impact force, large noise, cylinder damage and the like are easily caused.

Disclosure of utility model

The application aims to provide the stroke-adjustable cylinder buffer device, which can effectively slow down the movement speed of a piston rod when the piston rod in a stroke-adjustable cylinder is retracted to the stroke end, reduce the impact force, reduce the noise and prolong the service life of the cylinder.

The cylinder body comprises a cylinder barrel and an end cover positioned at the end part of the cylinder barrel, wherein an air hole communicated with the outside is formed in the end cover, a piston rod is slidably arranged in the cylinder barrel, a piston and a buffer ring are arranged on the side face of the piston rod, a stroke adjusting piece is positioned in the cylinder barrel, an orifice and a buffer air chamber which are communicated are formed in the stroke adjusting piece, a buffer sealing ring is embedded in the inner wall of the buffer air chamber, the buffer air chamber is communicated with the air hole, and a closed adjusting air chamber is defined between the piston and the stroke adjusting piece when the piston rod moves to the outer side face of the buffer ring close to the end cover and is in sealing abutting joint with the buffer sealing ring, and the adjusting air chamber is communicated with the orifice through the air hole between the cylinder barrel and the stroke adjusting piece.

Optionally, the stroke-adjustable cylinder buffer device further comprises a limiting piece mounted on the piston rod, the buffer ring comprises a first limiting surface and a second limiting surface which are oppositely arranged along the axial direction of the piston rod, the first limiting surface is abutted to the piston, and the second limiting surface is abutted to the limiting piece.

Optionally, the buffer ring includes along the axial of piston rod is linked together mounting hole and spacing hole, the internal diameter of spacing hole is greater than the mounting hole, spacing hole with the mounting hole is limited in the junction the second spacing face, the locating part butt is in on the second spacing face, the locating part is located at least partially in the spacing hole.

Optionally, the limiting piece is connected to the piston rod in a threaded mode.

Optionally, the outer diameter of the end of the buffer ring towards the end cap gradually decreases towards the direction approaching the end cap.

Optionally, an elastic buffer pad is arranged on the end surface of the piston facing the stroke adjusting piece.

Optionally, the stroke-adjustable cylinder buffer device further comprises an adjusting stud, wherein the adjusting stud is installed in a threaded hole of the end cover in a threaded mode, and one end of the adjusting stud is abutted to the stroke adjusting piece along the axial direction of the piston rod and can be adjusted in a movable mode along the axial direction.

Optionally, an air path communicated between the buffer air chamber and the air hole is formed in the adjusting stud.

Optionally, a threaded hole is formed in the end cover, and one end of the adjusting stud is in driving connection with the stroke adjusting piece and is movable along the axial direction of the piston rod.

Optionally, the stroke-adjustable cylinder buffer device further comprises a nut, the adjusting stud is in threaded connection with the nut, and the sealing gasket is arranged between the end cover and the nut in a sealing manner.

By adopting the technical scheme, the method has the following beneficial effects:

According to the stroke-adjustable cylinder buffer device provided by the application, when the piston rod moves to the end of the stroke, the buffer ring moves to be attached to the buffer sealing ring, the end of the piston rod is sealed at the opening of the buffer air chamber, and air in the air chamber can only enter the throttle hole through the hole between the cylinder barrel and the stroke adjusting piece and enter the buffer air chamber through the throttle hole, and then is discharged outside through the air hole on the end cover. In this process, because the throttle effect of orifice, the gas in the buffer gas chamber can't discharge fast, will produce certain atmospheric pressure to slow down the motion of piston rod, and then reach the cushioning effect, effectively reduce piston rod stroke terminal speed, reduce the impact force of piston rod, noise reduction, extension cylinder's life.

Drawings

Fig. 1 is a schematic structural diagram of a stroke-adjustable cylinder buffer according to an embodiment of the present application.

Fig. 2 is a schematic view of a structure in which an elastic cushion is disposed on a piston of a stroke-adjustable cylinder buffer according to an embodiment of the present application.

Reference numerals and signs

1-A cylinder body.

2-Cylinder.

3-Piston rod, 301-limiting piece.

4-Piston, 401-elastic buffer pad, 402-regulating air chamber, 403-piston sealing ring.

5-Buffer ring.

6-Stroke adjusting piece, 601-buffer sealing ring, 602-sealing ring, 603-orifice, 604-buffer air chamber.

7-End cover, 701-air holes.

8-Adjusting studs, 801-sealing gaskets, 802-gas paths and 803-milling planes.

9-Nut.

Detailed Description

Specific embodiments of the present utility model will be further described below with reference to the accompanying drawings.

It is to be readily understood that, according to the technical solutions of the present utility model, those skilled in the art may replace various structural modes and implementation modes with each other without changing the true spirit of the present utility model. Accordingly, the following detailed description and drawings are merely illustrative of the utility model and are not intended to be exhaustive or to limit the utility model to the precise form disclosed.

Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms.

The application provides a stroke-adjustable cylinder buffer device which comprises a cylinder body 1, wherein the cylinder body 1 comprises a cylinder barrel 2, an end cover 7 positioned at the end part of the cylinder barrel 2, a piston rod 3 and a stroke adjusting piece 6.

Referring to fig. 1 and 2, the end cover 7 is provided with an air hole 701 communicated with the outside, the piston rod 3 is slidably disposed in the cylinder 2, a piston 4 and a buffer ring 5 are disposed on a side surface of the piston rod 3, the stroke adjusting member 6 is disposed in the cylinder 2, the stroke adjusting member 6 is provided with an orifice 603 and a buffer air chamber 604 which are communicated with each other, a buffer sealing ring 601 is embedded on an inner wall of the buffer air chamber 604, the buffer air chamber 604 is communicated with the air hole 701, and when the piston rod 3 moves to a direction approaching to the end cover 7 until an outer side surface of the buffer ring 5 is in sealing contact with the buffer sealing ring 601, a closed adjusting air chamber 402 is defined between the piston 4 and the stroke adjusting member 6, and the adjusting air chamber 402 is communicated with the orifice 603 through an aperture between the cylinder 2 and the stroke adjusting member 6.

The orifice 603 in the embodiment of the application may be a small hole with an inner diameter of 0.5 mm-2 mm, or may be a hole with a hole diameter of more than 4mm and a flow-limiting piece arranged in the hole to achieve the effect of throttling. As shown in fig. 1, a piston seal 403 is provided on the outer side of the piston 4 to provide a sealing effect between the piston 4 and the cylinder 2, and a seal 602 is provided on the outer side of the stroke adjuster 6, the seal 602 being located between the orifice 603 and the end cap 7 to prevent gas from escaping from between the stroke adjuster 6 and the cylinder 2.

According to the stroke-adjustable cylinder buffer device provided by the embodiment of the application, when the piston rod 3 moves to the end of the stroke, the buffer ring 5 moves to be attached to the buffer sealing ring 601, the end of the piston rod 3 is sealed at the opening of the buffer air chamber 604, and the air in the adjusting air chamber 402 can only enter the throttle hole 603 through the hole between the cylinder barrel 2 and the stroke adjusting piece 6 and enter the buffer air chamber 604 through the throttle hole 603, and then is discharged out through the air hole 701 on the end cover 7. In this process, because the throttling effect of the throttle hole 603, the gas in the buffer air chamber 604 can not be discharged quickly, and a certain air pressure can be generated, so that the movement of the piston rod 3 is slowed down, the buffer effect is further achieved, the stroke end speed of the piston rod 3 is effectively reduced, the impact force of the piston rod 3 is reduced, the noise is reduced, and the service life of the cylinder is prolonged.

As an alternative embodiment, the stroke-adjustable cylinder buffer further includes a limiting member 301 mounted on the piston rod 3, and the buffer ring 5 includes a first limiting surface and a second limiting surface that are disposed opposite to each other along the axial direction of the piston rod 3, where the first limiting surface abuts against the piston 4, and the second limiting surface abuts against the limiting member 301. The limiting piece 301 in the embodiment of the application plays a role in axially limiting the buffer ring 5, so that the structural stability of the buffer ring 5 on the piston rod 3 is ensured.

As an alternative embodiment, the buffer ring 5 includes a mounting hole and a limiting hole that are communicated along an axial direction of the piston rod 3, an inner diameter of the limiting hole is larger than that of the mounting hole, the limiting hole and the mounting hole define the second limiting surface at a connection position, the limiting piece 301 abuts against the second limiting surface, and the limiting piece 301 is at least partially located in the limiting hole. The second limiting surface in the embodiment of the application forms a step structure in the buffer ring 5, and the limiting piece 301 is abutted on the second limiting surface and at least partially positioned in the limiting hole, so that the buffer ring 5 can be limited in the axial direction, and the buffer ring 5 can be supported in the radial direction.

As an alternative embodiment, the limiting member 301 is screwed to the piston rod 3. The threaded connection facilitates removal and adjustment of the position of stop 301.

As an alternative embodiment, the outer diameter of the end of the buffer ring 5 facing the end cap 7 gradually decreases in a direction approaching the end cap 7. As shown in fig. 1 to 2, the gradual decrease in the outer diameter of the end of the buffer ring 5 toward the end cap 7 is beneficial for the end of the buffer ring 5 to smoothly pass through the buffer seal 601, so as to prevent the buffer seal 601 from being scratched.

As an alternative embodiment, an elastic buffer 401 is provided on the end surface of the piston 4 facing the stroke adjuster 6. As shown in fig. 2, the elastic cushion 401 may be a sheet rubber member, and combines with the stroke adjuster 6 to form a combination of air cushion and rubber cushion, thereby enhancing the cushioning effect.

As an alternative embodiment, the adjustable stroke cylinder buffer further comprises an adjusting stud 8, wherein the adjusting stud 8 is threadedly mounted in a threaded hole of the end cover 7, and one end of the adjusting stud 8 is in driving connection with 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 application, the stroke adjusting piece 6 is driven by the adjusting stud 8 to axially move relative to the end cover 7, so that the stroke of the piston rod 3 is adjustable.

As an alternative embodiment, the adjusting stud is provided with a gas path 802 that is communicated between the buffer chamber 604 and the air hole 701. As shown in fig. 1 to 2, the path of the air path 802 is L-shaped, a sunk circular hole is formed in the end face of the end cover 7, an air outlet hole is formed in the side face of the end cover 7, the circular hole is communicated with the air outlet hole to form an air hole 701, and two ends of the path air path 802 of the air hole 701 are respectively connected with the buffer air chamber 604 and the air hole 701 to realize the communication between the buffer air chamber 604 and the air hole 701.

As an alternative embodiment, the end cover 7 is provided with a threaded hole, and the adjusting stud 8 is in threaded connection with the threaded hole of the end cover 7. The threaded connection can enable the adjusting stud 8 to rotate in the threaded hole of the end cover 7, and when the adjusting stud is screwed in, the stroke adjusting piece 6 is driven to move in the direction away from the end cover 7, and when the adjusting stud is screwed out, the stroke adjusting piece 6 is driven to move in the direction close to the end cover 7. Milling planes 803 can be formed in the outer end face of the adjusting stud 8 so as to be convenient for clamping an adjusting tool and convenient for adjusting the screwing-in or screwing-out of the stud 8.

As an alternative embodiment, the stroke-adjustable cylinder buffer further comprises a nut 9, the adjusting stud 8 is screwed on the nut 9, and a sealing gasket 801 is arranged between the end cover 7 and the nut 9 in a sealing manner. The nut 9 in the embodiment of the present application plays a role of locking and fixing the adjusting screw to limit the positions of the retraction stroke ends of the piston rod 3 and the piston 4. The gasket 801 is arranged on the outer side of the end cover 7 in a sealing way, and has a sealing effect on the threaded hole on the end cover 7, so that air flow is prevented from escaping from the threaded hole on the end cover 7.

The above technical schemes can be combined according to the need to achieve the best technical effect.

The foregoing is only illustrative of the principles and preferred embodiments of the present utility model. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the utility model and should also be considered as the scope of protection of the present utility model.

Claims (10)

1. The stroke-adjustable cylinder buffer device is characterized by comprising a cylinder body, wherein the cylinder body comprises:

The cylinder barrel and the end cover positioned at the end part of the cylinder barrel are provided with air holes communicated with the outside;

the piston rod is arranged in the cylinder barrel in a sliding manner, and a piston and a buffer ring are arranged on the side face of the piston rod;

The stroke adjusting piece is positioned in the cylinder barrel, an orifice and a buffer air chamber which are communicated are arranged on the stroke adjusting piece, a buffer sealing ring is embedded on the inner wall of the buffer air chamber, and the buffer air chamber is communicated with the air hole;

When the piston rod moves to the outer side face of the buffer ring to be in sealing abutting joint with the buffer sealing ring in the direction close to the end cover, a closed adjusting air chamber is defined between the piston and the stroke adjusting piece, and the adjusting air chamber is communicated with the throttling hole through a hole between the cylinder barrel and the stroke adjusting piece.

2. The stroke-adjustable cylinder buffering device according to claim 1, wherein an elastic buffer pad is arranged on an end surface of the piston facing the stroke adjusting member.

3. The adjustable stroke cylinder damping device of claim 1, further comprising an adjustment stud threadedly mounted in a threaded bore of the end cap, one end of the adjustment stud drivingly connected to the stroke adjuster and movable in an axial direction of the piston rod.

4. The stroke-adjustable cylinder buffer as recited in claim 3 wherein said adjustment stud is provided with a gas path communicating between said buffer chamber and said gas vent.

5. The stroke-adjustable cylinder buffering apparatus of claim 4, wherein the end cap is provided with a threaded hole, and the adjusting stud is in threaded connection with the threaded hole of the end cap.

6. The adjustable stroke cylinder damping device as recited in claim 5, further comprising a nut, said adjustment stud being threadably connected to said nut, a gasket seal being disposed between said end cap and said nut.

7. The adjustable stroke cylinder damper as recited in claim 1, further comprising a stop mounted on said piston rod, said damper ring including first and second stop surfaces disposed opposite one another in an axial direction of said piston rod, said first stop surface abutting said piston and said second stop surface abutting said stop.

8. The adjustable stroke cylinder cushioning device of claim 7, wherein said cushioning ring includes a mounting bore and a limiting bore in communication along an axial direction of said piston rod, said limiting bore having an inner diameter greater than said mounting bore, said limiting bore and said mounting bore defining said second limiting surface at a junction, said limiter abutting said second limiting surface, said limiter being at least partially disposed within said limiting bore.

9. The adjustable stroke cylinder damping device as recited in claim 7, wherein said stop is threadably connected to said piston rod.

10. The adjustable stroke cylinder damping device of claim 2, wherein an outer diameter of an end of the damping ring toward the end cap is gradually reduced toward a direction approaching the end cap.