CN218207294U - Long-stroke high-speed buffer hydraulic cylinder - Google Patents

Abstract

The utility model discloses a long-stroke high-speed buffer hydraulic cylinder, which comprises a cylinder barrel, a cylinder bottom, a guide sleeve, a rod cavity oil port, a piston rod and a piston; a middle spacer sleeve and a buffer sleeve are fixedly arranged on the piston rod in front of the piston in sequence, an annular groove is formed in the excircle of the middle spacer sleeve, and a buffer conical surface is arranged at the front end of the buffer sleeve; the cylinder bottom is fixedly connected with a rodless cavity oil port seat, the rodless cavity oil port seat is provided with a rodless cavity oil port, the rear end of the piston rod is fixedly provided with a buffer shaft, the rear end of the buffer shaft is provided with a buffer conical surface, and the buffer conical surface penetrates through a central hole of the cylinder bottom and is positioned in the rodless cavity oil port; an extending starting oil port communicated with the central hole of the cylinder bottom is arranged in the cylinder bottom; a flange plate is fixedly connected outside the cylinder barrel in front of the oil port of the rod cavity, and a retraction starting oil port communicated with the rod cavity is arranged in the flange plate and the cylinder barrel; the utility model discloses have good buffering effect and reduce the shake, and can improve sealed effect, keep sealed long-term effect, prolong the life of sealing member.

Description

Long-stroke high-speed buffer hydraulic cylinder

Technical Field

The utility model relates to a buffer hydraulic cylinder, especially a long stroke high speed buffer hydraulic cylinder.

Background

The hydraulic cylinder is an actuating element which can do linear reciprocating motion and bear large load, and in the actual use process, the stroke is often needed to be very long, the running speed is high, and leakage does not need to be caused as much as possible; the existing buffer oil cylinder buffers the oil cylinder at high speed, so that impact is easily caused, shaking is caused, normal work of the oil cylinder is influenced, machining errors caused by long stroke and severe abrasion are caused to a guide sleeve, a corresponding support seal and a sealing piece on a piston, the sealing effect is influenced, the service life of the sealing piece is short, and the sealing piece is frequently replaced.

Disclosure of Invention

The utility model aims at the above-mentioned not enough of prior art, provide a long stroke high-speed buffer pneumatic cylinder, it has good buffering effect and reduces the shake, and can improve sealed effect, keep sealed long-term effect, the life of extension sealing member.

In order to achieve the above object, the utility model discloses a long stroke high-speed buffer hydraulic cylinder, include cylinder, cylinder bottom, uide bushing, have pole chamber hydraulic fluid port, piston rod and piston, its characterized in that: a middle spacer sleeve and a buffer sleeve are fixedly arranged on the piston rod in front of the piston in sequence, an annular groove is formed in the excircle of the middle spacer sleeve, and a buffer conical surface is arranged at the front end of the buffer sleeve; the cylinder bottom is fixedly connected with a rodless cavity oil port seat, the rodless cavity oil port seat is provided with a rodless cavity oil port, the rear end of the piston rod is fixedly provided with a buffer shaft, the rear end of the buffer shaft is provided with a buffer conical surface, and the buffer conical surface penetrates through a central hole of the cylinder bottom and is positioned in the rodless cavity oil port; an extending starting oil port communicated with a central hole of the cylinder bottom is arranged in the cylinder bottom; a flange plate is fixedly connected outside the cylinder barrel in front of the oil port of the rod cavity, and a retraction starting oil port communicated with the rod cavity is arranged in the flange plate and the cylinder barrel;

when in work: in the initial stage of extending the piston rod, the oil port of the rodless cavity and the oil port of the extension starting are simultaneously fed with oil, the rodless cavity and the oil port of the extension starting can be rapidly extended out, when the buffer sleeve at the tail end of the stroke plays a role in buffering, the oil feeding is stopped by extending the oil port of the extension starting, a small amount of hydraulic oil enters the annular groove of the middle spacer sleeve, the buffering pressure build-up is reduced, the good buffering effect is realized, the jitter can be reduced, and the normal work of the oil cylinder is ensured; similarly, in the initial stage of retraction of the piston rod, the oil port of the rod cavity and the retraction starting oil port simultaneously feed oil, the retraction can be rapidly retracted, and when the buffer shaft at the tail end of the stroke plays a role in buffering, the retraction starting oil port stops feeding oil;

as a further improvement of the utility model, the center hole of the cylinder bottom is a stepped hole, a copper sleeve is arranged in the rear section of the stepped hole, the copper sleeve is in small clearance fit with a buffer shaft in the copper sleeve, and a starting oil port is extended out to be communicated with the center hole in front of the copper sleeve; the copper sleeve is matched with the buffer shaft, so that the buffer effect can be improved;

as a further improvement of the utility model, the excircle of the piston is provided with two combined sealing rings and two Y-shaped sealing rings positioned at two sides of the two combined sealing rings, and the piston is internally provided with two oil passing holes for communicating the front end surface with the front Y-shaped sealing ring and the rear end surface with the rear Y-shaped sealing ring; hydraulic oil is introduced into the two oil passing holes to enable the lip edges of the Y-direction sealing rings to expand and cling to the cylinder barrel, so that the sealing is reliable under the condition that the inner wall roundness and coaxiality errors are large due to the fact that the ultra-long cylinder barrel is machined, and the sealing effect is improved;

as a further improvement of the utility model, a gasket and a sleeve body are sequentially arranged in the cylinder barrel in front of the guide sleeve, a plurality of O-shaped sealing rings are arranged on the excircle of the sleeve body, a rear sealing filler, a spacer bush, a front sealing filler and a compression ring are sequentially arranged in the sleeve body in front of the gasket, the front end of the cylinder barrel is connected with a pressing sleeve through a thread, and the pressing sleeve is contacted with the compression ring; the sleeve body outside the spacer sleeve is provided with a plurality of oil passing holes and a ring groove communicated with all the oil passing holes, and the cylinder barrel is provided with a recovered oil port communicated with the ring groove; when the sealing filler is worn, the pressing sleeve is fastened and adjusted, the prepressing of the pressing ring on the sealing filler is improved, the sealing fit of the piston rod is increased, the sealing compensation is realized, the sealing effect is improved, the long-term sealing effect is kept, and the service life of a sealing element is prolonged; a small amount of leakage generated by buffering pressure building can be collected through a recovered oil port;

to sum up, the utility model discloses have good buffering effect and reduce the shake, and can improve sealed effect, keep sealed long-term, prolong the life of sealing member.

Drawings

Fig. 1 is a front view of an embodiment of the present invention.

Fig. 2 is a view from direction K of fig. 1.

Fig. 3 is a cross-sectional view N-N of fig. 1.

Fig. 4 is a partially enlarged view of a portion a of fig. 1.

Fig. 5 is a partially enlarged view of fig. 1 at B.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 5, the long-stroke high-speed buffer hydraulic cylinder of this embodiment includes a cylinder barrel 1, a cylinder bottom 2, a guide sleeve 3, a rod cavity port 4, a piston rod 5, a piston 6, and a flange 7 welded and fixedly connected to the outside of the cylinder barrel 1 in front of the rod cavity port 4; a middle spacer sleeve 8 and a buffer sleeve 9 are fixedly arranged on the piston rod 5 in front of the piston 6 in sequence, two ring grooves 10 are arranged on the excircle of the middle spacer sleeve 8, and a buffer conical surface is arranged at the front end of the buffer sleeve 9; the cylinder bottom 2 is fixedly connected with a rodless cavity oil port seat 11 through a bolt, the rodless cavity oil port seat 11 is provided with a rodless cavity oil port 12, the rear end of the piston rod 5 is fixedly provided with a buffer shaft 13, the buffer shaft 13 penetrates through a stepped hole of the cylinder bottom 2, the rear end of the buffer shaft 13 is provided with a buffer conical surface, the buffer conical surface is positioned in the rodless cavity oil port 12, a copper sleeve 14 is arranged in the rear section of the stepped hole, and the copper sleeve 14 is in small clearance fit with the buffer shaft 13 in the copper sleeve; a start oil port 15 which is extended out and communicated with a stepped hole in front of the copper bush 14 is arranged in the cylinder bottom 2; a retraction starting oil port 16 communicated with the rod cavity is arranged in the flange plate 7 and the cylinder barrel 1; the excircle of the piston 6 is provided with two combined sealing rings 17 and two Y- shaped sealing rings 18 and 19 positioned at two sides of the two combined sealing rings, and the piston 6 is internally provided with an oil passing hole 20 for communicating the front end surface with the front Y-shaped sealing ring 18 and an oil passing hole 21 for communicating the rear end surface with the rear Y-shaped sealing ring 19; a gasket 22 and a sleeve body 23 are sequentially arranged in the cylinder barrel 1 in front of the guide sleeve 3, a plurality of O-shaped sealing rings 24 are arranged on the outer circle of the sleeve body 23, a rear sealing filler 25, a spacer bush 26, a front sealing filler 27 and a pressing ring 28 are sequentially arranged in the sleeve body 23 in front of the gasket 22, a pressing sleeve 29 is connected to the front end of the cylinder barrel 1 through threads, and the pressing sleeve 29 is in contact with the pressing ring 28; the sleeve body 23 outside the spacer 26 is provided with a plurality of oil passing holes 30 and a ring groove 31 communicated with all the oil passing holes 30, and the cylinder barrel 1 is provided with a recovery oil port 32 communicated with the ring groove 31;

when in work: in the initial stage of extending the piston rod 5, the rodless cavity oil port 12 and the extending starting oil port 15 simultaneously feed oil, the rodless cavity oil port can rapidly extend, when the buffer sleeve 9 at the tail end of the stroke acts for buffering, the extending starting oil port 15 stops feeding oil, a small amount of hydraulic oil enters the annular groove 10 of the middle spacer sleeve 8, the buffering pressure blocking and impact are reduced, the good buffering effect is realized, the jitter can be reduced, and the normal work of the oil cylinder is ensured; similarly, in the initial stage of retraction of the piston rod 5, the rod cavity oil port 4 and the retraction starting oil port 16 simultaneously feed oil, the retraction can be rapidly retracted, and when the buffer shaft 13 at the tail end of the stroke plays a role in buffering, the retraction starting oil port 16 stops feeding oil; the copper sleeve 14 is matched with the buffer shaft 13, so that the buffer effect can be improved; hydraulic oil can be introduced into the two oil passing holes 20 and 21 to enable the lip edges of the Y- direction sealing rings 18 and 19 to expand and cling to the inner wall of the cylinder barrel 1, so that the sealing reliability is guaranteed under the conditions that the roundness of the inner wall and the coaxiality error of the piston rod 5 and the cylinder barrel 1 are larger due to the processing of the overlong cylinder barrel, and the sealing effect is improved; when the sealing filler is worn, the pressing sleeve 29 is rotated to perform fastening adjustment, so that the prepressing of the pressing ring 28 on the sealing filler is improved, the sealing attachment of the piston rod 5 is increased, the sealing compensation is realized, the sealing effect is improved, the sealing long-term effect is kept, and the service life of the sealing element is prolonged; a small amount of leakage generated by buffering pressure building can enter a recovery oil port 32 through the oil passing hole 30 and the annular groove 31 for collection.

Claims (4)

1. The utility model provides a long stroke high speed buffer pneumatic cylinder, includes cylinder, the cylinder bottom, uide bushing, has pole chamber hydraulic fluid port, piston rod and piston, its characterized in that: a middle spacer sleeve and a buffer sleeve are fixedly arranged on the piston rod in front of the piston in sequence, an annular groove is formed in the excircle of the middle spacer sleeve, and a buffer conical surface is arranged at the front end of the buffer sleeve; the cylinder bottom is fixedly connected with a rodless cavity oil port seat, the rodless cavity oil port seat is provided with a rodless cavity oil port, the rear end of the piston rod is fixedly provided with a buffer shaft, the rear end of the buffer shaft is provided with a buffer conical surface, and the buffer conical surface penetrates through a central hole of the cylinder bottom and is positioned in the rodless cavity oil port; an extending starting oil port communicated with the central hole of the cylinder bottom is arranged in the cylinder bottom; the cylinder barrel in front of the oil port of the rod cavity is fixedly connected with a flange plate outside, and a retraction starting oil port communicated with the rod cavity is arranged in the flange plate and the cylinder barrel.

2. The long travel hydraulic cache cylinder of claim 1 wherein: the central hole of the cylinder bottom is a stepped hole, a copper sleeve is arranged in the rear section of the stepped hole, the copper sleeve is in small clearance fit with a buffer shaft in the copper sleeve, and the copper sleeve extends out of a starting oil port to be communicated with the central hole in front of the copper sleeve.

3. The long stroke high speed buffer hydraulic cylinder according to claim 1 or 2, wherein: the outer circle of the piston is provided with two combined sealing rings and two Y-shaped sealing rings positioned on two sides of the two combined sealing rings, and two oil passing holes communicated with the front end face and the front Y-shaped sealing ring and the rear end face and the rear Y-shaped sealing ring are formed in the piston.

4. The long travel hydraulic cache cylinder of claim 3, wherein: a gasket and a sleeve body are sequentially arranged in the cylinder barrel in front of the guide sleeve, a plurality of O-shaped sealing rings are arranged on the excircle of the sleeve body, rear sealing filler, a spacer bush, front sealing filler and a pressing ring are sequentially arranged in the sleeve body in front of the gasket, the front end of the cylinder barrel is connected with a pressing sleeve through threads, and the pressing sleeve is contacted with the pressing ring; the sleeve body outside the spacer sleeve is provided with a plurality of oil passing holes and an annular groove communicated with all the oil passing holes, and the cylinder barrel is provided with a recovered oil port communicated with the annular groove.

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