CN102654153A

CN102654153A - Buffering device for plunger hydraulic cylinder

Info

Publication number: CN102654153A
Application number: CN2012101638097A
Authority: CN
Inventors: 邓江涛; 杨发虎; 潘昌财
Original assignee: CHONGQING DIMA INDUSTRY Co Ltd
Current assignee: CHONGQING DIMA INDUSTRY Co Ltd
Priority date: 2012-05-24
Filing date: 2012-05-24
Publication date: 2012-09-05
Anticipated expiration: 2032-05-24
Also published as: CN102654153B

Abstract

The invention discloses a buffering device for a plunger hydraulic cylinder. The buffering device comprises a cylinder barrel, a front end cover and a back end cover, wherein a piston and a piston rod are arranged in the cylinder barrel; the piston rod extends out from the cylinder barrel and is welded with a check valve base; a check valve hole capable of mounting of a check valve is arranged in the check valve base; the piston rod is a hollow piston rod; an oil inlet and a first through hole communicated with the check valve hole are arranged on the check valve base; a first hole is communicated with an inner hole of the piston rod; a second through hole communicated with the inner hole of the piston rod is arranged at the center of the piston; a one-way valve base is fixedly connected with the inner side of the back end cover; a one-way valve core is arranged in the one-way valve base; the head of the one-way valve core can block the second through hole; a spring is arranged between the head of the one-way valve core and the one-way valve base; a third through hole which is parallel to the second through hole is arranged on the piston; and a throttling device is internally threaded to a third through hole. The buffering device for the plunger hydraulic cylinder disclosed by the invention has the advantages of good buffering effect, simple manufacturing process, adjustable buffering time and high reliability.

Description

A kind of plunger piston fluid pressure cylinder damping device

Technical field

The present invention relates to a kind of cylinder cushion device, particularly relate to a kind of compression garbage truck lift ram hydraulic pressure cylinder cushion that is used for.

Background technique

Compression garbage truck lift ram oil hydraulic cylinder is when Bottom Of Descent, and the new oil hydraulic cylinder cushioning effect that has is just undesirable, and cushioning effect reduces the oil hydraulic cylinder that has with increasing service time, causes the compression garbage truck vibrations very big.

Therefore those skilled in the art are devoted to develop a kind of good buffer effect and stable plunger piston fluid pressure cylinder damping device, reduce the vibrations of compression garbage truck when the lift ram oil hydraulic cylinder Bottom Of Descent to satisfy.

Summary of the invention

Because the above-mentioned defective of existing technology, technical problem to be solved by this invention provides a kind of good buffer effect and stable plunger piston fluid pressure cylinder damping device.

For realizing above-mentioned purpose, the invention provides a kind of plunger piston fluid pressure cylinder damping device, comprise cylinder barrel, front cover and rear end cover; Be provided with piston and piston rod in the said cylinder barrel; Said piston rod stretches out said cylinder barrel and is welded with Boilor check valve seat at external part; Be provided with the safety check valve opening that safety check can be installed in the said Boilor check valve seat; Said piston rod is the box type piston bar; Said Boilor check valve seat is provided with the oil inlet hole and first through hole that communicates with said check valve hole; Said first hole communicates with the endoporus of said piston rod;

The center of said piston is provided with second through hole that communicates with the endoporus of said piston rod; The inboard of said rear end cover is fixedly connected with unidirectional valve seat; Be provided with nonreturn valve core in the said unidirectional valve seat; But said second through hole of the head shutoff of said nonreturn valve core; Be provided with spring between the head of said nonreturn valve core and the said unidirectional valve seat;

Said piston is provided with and the parallel third through-hole of said second through hole; Said third through-hole internal thread is connected with throttling.

Preferable, for further improving cushioning effect, said spring is a tapered coil spring.

Preferable, the head of said nonreturn valve core is provided with conical structure.

Preferable, said piston rod is connected with said piston thread; Said cylinder barrel is threaded with said front cover and rear end cover; Said unidirectional valve seat is threaded with said rear end cover.

Rock for avoiding piston rod to produce at the volley, it is stepped to be two-stage on the appearance integral of said piston; The smaller diameter end of said piston stretches in the said piston rod and with said piston rod thread and cooperates; The internal surface of said cylinder barrel is fixed with guide ring; Said guide ring cooperates than larger diameter end with said piston; Said piston is provided with at least one plane vertically than the outer surface of larger diameter end; Said plane and said guide ring constitute oil groove.

Preferable, the internal surface of said cylinder barrel is arranged at intervals with two said guide rings; The outer surface of said piston is uniformly distributed with and is provided with 6 said planes.

The invention has the beneficial effects as follows:

(1) owing to do not cooperate the buffer gap, therefore can significantly reduce the processing technology cost;

Throttling that (2) can pass through the different apertures of replacing is to adjust buffer time;

(3) be 100,000 the working life owing to one-way valve, so cushioning effect is durable in use, can not reduce with oil hydraulic cylinder lengthening service time;

(4) overall structure is simple, makes simple.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the invention.

Fig. 2 is the A-A sectional view of Fig. 1.

Fig. 3 is the partial enlarged drawing at I place among Fig. 1.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further:

To shown in Figure 3, a kind of plunger piston fluid pressure cylinder damping device comprises cylinder barrel 7, front cover 18 and rear end cover 15 like Fig. 1.Be provided with piston 4 and piston rod 8 in the cylinder barrel 7, piston rod 8 stretches out cylinder barrel 7 and is welded with Boilor check valve seat 9 at external part, is provided with the safety check valve opening 10 that safety check can be installed in the Boilor check valve seat 9.

Piston rod 8 is the box type piston bar, and Boilor check valve seat 9 is provided with the oil inlet hole 11 and first through hole, 12, the first holes 12 that communicate with check valve hole 10 and communicates with the endoporus 8a of piston rod 8.

The center of piston 4 is provided with second through hole 13 that communicates with the endoporus 8a of piston rod; The inboard of rear end cover 15 is fixedly connected with unidirectional valve seat 6; Be provided with nonreturn valve core 3 in the unidirectional valve seat 6; But head 3a shutoff second through hole 13 of nonreturn valve core is provided with tapered coil spring 5 between the head 3a of nonreturn valve core and the unidirectional valve seat 6.

Piston 4 is provided with the third through-hole 14 parallel with second through hole 13, and third through-hole 14 internal threads are connected with throttling 2.

In the present embodiment, the head 3a of nonreturn valve core is a conical structure.

In the present embodiment, piston rod 8 is threaded with piston 4, and cylinder barrel 7 is threaded with front cover 18 and rear end cover 15, and unidirectional valve seat 6 is threaded with rear end cover 15.

It is stepped to be two-stage on the appearance integral of piston 4.The smaller diameter end of piston 4 stretches in the piston rod 8 and with piston rod thread and cooperates.The internal surface fixed interval of cylinder barrel 7 has two guide rings 16, and guide ring 16 cooperates than larger diameter end with piston 4.Piston 4 is uniformly distributed with vertically than the outer surface of larger diameter end and is provided with 6 plane 4a, and plane 4a and guide ring 16 constitute oil grooves 17.

Solenoid check valve is inserted safety check valve opening 10.During hydraulic cylinder works; Piston rod 8 stretches out movement process: hydraulic oil from oil inlet hole 11 to slotting formula solenoid check valve (normally closed) through first through hole 12; Through box type piston bar 8 to second through holes 13 and throttling 2, promote piston rod 8 and start fast, piston rod 8 is done stretched out motion.

Piston rod recovery movement process is: insert formula solenoid check valve (normally closed) electric after; Hydraulic oil to box type piston bar 8, arrives oil inlet hole 11 through slotting formula solenoid check valve (normally closed) through the aperture of second through hole 13 (this moment one-way valve spool throw off) and throttling 2 again; When piston 4 moved to nonreturn valve core 3, second through hole 13 was closed gradually, and hydraulic oil only passes through from the aperture of throttling 2, thereby piston rod 8 is slowed down.

More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art need not creative work and just can design according to the present invention make many modifications and variation.Therefore, all technician in the art all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology through the available technological scheme of logical analysis, reasoning, or a limited experiment.

Claims

1. a plunger piston fluid pressure cylinder damping device comprises cylinder barrel (7), front cover (18) and rear end cover (15); Be provided with piston (4) and piston rod (8) in the said cylinder barrel (7); Said piston rod (8) stretches out said cylinder barrel (7) and is welded with Boilor check valve seat (9) at external part; Be provided with the safety check valve opening (10) that safety check can be installed in the said Boilor check valve seat (9); It is characterized in that: said piston rod (8) is the box type piston bar; Said Boilor check valve seat (9) is provided with oil inlet hole (11) and first through hole (12) that communicates with said check valve hole (10); Said first hole (12) communicates with the endoporus (8a) of said piston rod (8);

The center of the said piston of said piston (4) is provided with second through hole (13) that communicates with the endoporus (8a) of said piston rod; The inboard of said rear end cover (15) is fixedly connected with unidirectional valve seat (6); Be provided with nonreturn valve core (3) in the said unidirectional valve seat (6); The head of said nonreturn valve core (3a) but said second through hole of shutoff (13); Be provided with spring (5) between head of said nonreturn valve core (3a) and the said unidirectional valve seat (6);

Said piston (4) is provided with the third through-hole (14) parallel with said second through hole (13); Said third through-hole (14) internal thread is connected with throttling (2).

2. plunger piston fluid pressure cylinder damping device as claimed in claim 1 is characterized in that: said spring (5) is a tapered coil spring.

3. according to claim 1 or claim 2 plunger piston fluid pressure cylinder damping device, it is characterized in that: the head of said nonreturn valve core (3) is provided with conical structure.

4. according to claim 1 or claim 2 plunger piston fluid pressure cylinder damping device, it is characterized in that: said piston rod (8) is threaded with said piston (4); Said cylinder barrel (7) is threaded with said front cover (18) and rear end cover (15); Said unidirectional valve seat (6) is threaded with said rear end cover (15).

5. according to claim 1 or claim 2 plunger piston fluid pressure cylinder damping device, it is characterized in that: it is stepped to be two-stage on the appearance integral of said piston (4); The smaller diameter end of said piston (4) stretches in the said piston rod (8) and with said piston rod thread and cooperates; The internal surface of said cylinder barrel (7) is fixed with guide ring (16); Said guide ring (16) cooperates than larger diameter end with said piston (4); Said piston (4) is provided with at least one plane (4a) vertically than the outer surface of larger diameter end; Said plane (4a) constitutes oil groove (17) with said guide ring (16).

6. plunger piston fluid pressure cylinder damping device as claimed in claim 5 is characterized in that: the internal surface of said cylinder barrel (7) is arranged at intervals with two said guide rings (16); The outer surface of said piston (4) is uniformly distributed with and is provided with 6 said planes (4a).