CN101634319B

CN101634319B - Single-acting rapid-pressurizing hydraulic cylinder

Info

Publication number: CN101634319B
Application number: CN2009100636158A
Authority: CN
Inventors: 黄金平
Original assignee: Yichang Dongfang Printing Machinery Co Ltd
Current assignee: Yichang Dongfang Printing Machinery Co Ltd
Priority date: 2009-08-14
Filing date: 2009-08-14
Publication date: 2012-05-30
Anticipated expiration: 2029-08-14
Also published as: CN101634319A

Abstract

The invention discloses a single-acting rapid-pressurizing hydraulic cylinder, comprising a large cylinder sleeve, a large piston, a small cylinder sleeve, a small piston and a cylinder bottom head; wherein the large cylinder sleeve is coupled with the cylinder bottom head in an integrating way, the large piston is coupled with the large cylinder sleeve in a sliding way, the small cylinder sleeve is coupled with the cylinder bottom head in the integrating way, the small piston is coupled with the small cylinder sleeve in the sliding way, the small piston forms a small oil chamber with the small cylinder sleeve and the cylinder bottom head, the large piston forms a large oil chamber with the large cylinder sleeve, the small cylinder sleeve and the cylinder bottom head, the small oil chamber is communicated with a hydraulic change-over valve oil inlet, a control oil inlet and a magnetic exchange valve oil outlet, and the large oil chamber is connected with a hydraulic change-over valve oil outlet. The invention adopts the small piston and the small cylinder sleeve to substitute the piston rod in the prior art and changes oil-taking direction, skilfully overcomes the problem that coaxiality and end face runout are required to be ensured in piston processing, reduces processing difficulty of cylinder, has simple structure and good workability and improves production efficiency.

Description

Single-acting rapid-pressurizing hydraulic cylinder

Technical field

The present invention relates to a kind of improvement of oil hydraulic cylinder, especially a kind of single-acting rapid-pressurizing hydraulic cylinder.

Background technique

State Intellectual Property Office discloses a kind of sequential composite oil cylinder (patent No. ZL200620078682.9); This housing structure is complicated; Adopt the flange-type piston rod, need guarantee the coaxality and the end face run-out degree of piston rod size external diameter and endoporus in actual use, cause great difficulty to processing.

Summary of the invention

The objective of the invention is defective, a kind of single-acting rapid-pressurizing hydraulic cylinder is provided, overcome the problem that needs to guarantee coaxality and end face run-out degree in the piston processing to above-mentioned existing technology, simple in structure, be prone to processing.

The technological scheme taked of the present invention is to achieve these goals: a kind of single-acting rapid-pressurizing hydraulic cylinder; Include big cylinder sleeve, big piston, little cylinder sleeve, small piston, cylinder bottom head, big cylinder sleeve and cylinder bottom head are fixedly connected, and big piston is slidingly connected with big cylinder sleeve; Little cylinder sleeve and cylinder bottom head are fixedly connected; Small piston and little cylinder sleeve are slidingly connected, and small piston and little cylinder sleeve and cylinder bottom head form small oil cavity, and big piston forms big oil pocket with big cylinder sleeve, little cylinder sleeve and cylinder bottom head; Small oil cavity communicates with hydraulicchange-over valve filler opening, control oil inlet and solenoid directional control valve oil outlet, and big oil pocket is connected with the hydraulicchange-over valve oil outlet.

Above-mentioned single-acting rapid-pressurizing hydraulic cylinder, described hydraulicchange-over valve comprise spool, top cover, spring seat, spring and the hollow bolt that is installed in cylinder bottom head, and hollow bolt is connected with oil sump through pipeline; Spool, top cover can slide up and down; When spool was in initial position, oil sump communicated with big oil pocket through spool, when spool pressurized during to lower slider; Oil sump is communicated with big oil pocket with big oil pocket sealing, small oil cavity.

Adopt said structure, hydraulic oil at first promotes small piston and is moved to the left, and at this moment the oil in the oil sump is inhaled into big oil pocket through hydraulicchange-over valve; Realized the fast moving function of piston, when big piston touches by the pressure thing, when the small oil cavity hydraulic fluid pressure increases to a certain degree; Pressure oil promotes valve core movement; Large and small oil pocket is communicated with, has broken off oil circuit simultaneously, the function of increasing pressure of having realized from oil sump.Owing to adopt small piston and little cylinder sleeve to replace the piston rod of existing technology; And changed the oil-feed direction; Overcome the problem that needs to guarantee coaxality and end face run-out degree in the piston processing dexterously, so it is the present invention has reduced the difficulty of processing of oil cylinder, simple in structure; Be prone to processing, improved manufacturing efficiency.

Description of drawings

Fig. 1 is a structural representation of the present invention

Fig. 2 is embodiments of the invention.

The double accompanying drawing that makes an abstract of Fig. 1 wherein.

Embodiment

Below in conjunction with accompanying drawing and instance the present invention is further described.

As shown in the figure, a kind of single-acting rapid-pressurizing hydraulic cylinder comprises big cylinder sleeve 1, big piston 2, little cylinder sleeve 3, small piston 4, cylinder bottom head 5; Big cylinder sleeve 1 is fixedly connected with cylinder bottom head 5, and big piston 2 is slidingly connected with big cylinder sleeve 1, and little cylinder sleeve 3 is fixedly connected with cylinder bottom head 5; Small piston 4 is slidingly connected with little cylinder sleeve 3, and small piston 4 forms small oil cavity 7 with little cylinder sleeve 3 and cylinder bottom head 5, and big piston 2 forms big oil pocket 6 with big cylinder sleeve 1, little cylinder sleeve 3 and cylinder bottom head 5; The spool 13, top cover 14, spring seat 17, spring 15 and the hollow bolt 16 that are installed in cylinder bottom head are formed hydraulicchange-over valve, and hollow bolt is connected with oil sump 12 through pipeline, and spool, top cover can slide up and down; When spool 13 is in initial position; Oil sump 12 communicates with big oil pocket 6 through spool 13, when spool 13 pressurizeds during to lower slider, and oil sump 12 and big oil pocket 6 sealings; Small oil cavity 7 is communicated with big oil pocket 6, and small oil cavity 7 is connected with solenoid directional control valve 11.

Working principle of the present invention is: when solenoid directional control valve 11 spools are in position, a left side; Hydraulic oil gets into small oil cavity 7 through the oil inlet hole of cylinder bottom head 5; Promoting small piston 4 is moved to the left; Promote big piston 2 when small piston 4 is moved to the left to left movement, at this moment the oil in the oil sump is inhaled into big oil pocket 6 through the hydraulicchange-over valve of spool 13, top cover 14, spring seat 17, spring 15 and hollow bolt 16 compositions, has realized the fast moving function of big piston.When big piston 2 touched by the pressure thing, small oil cavity 7 hydraulic fluid pressures increased, when acquiring a certain degree; Pressure oil promotes spool 13 and moves downward, and big oil pocket 6 is communicated with small oil cavity 7, has broken off the oil circuit from oil sump simultaneously; At this moment oil pump is given the oiling simultaneously of big small oil cavity; Because of lifting surface area increases,, so just realized function of increasing pressure so the pressure that acts on the big piston has also just increased.

When the electromagnetic switch valve core is in right; Hydraulic oil from oil pump flows into oil sump, and spool 13 is depressed into the topmost part under the effect of spring 15, and this moment, big oil pocket 6 communicated with oil sump; Small oil cavity 7 communicates with oil sump through oil inlet hole, solenoid directional control valve, and system is in unloading condition.Big piston 2 moves right under external force and promotes small piston 4 simultaneously and move right, and big small piston sets back.

Claims

1. single-acting rapid-pressurizing hydraulic cylinder; Comprise big cylinder sleeve (1), big piston (2), little cylinder sleeve (3), small piston (4), cylinder bottom head (5); It is characterized in that: big cylinder sleeve (1) is fixedly connected with cylinder bottom head (5); Big piston (2) is slidingly connected with big cylinder sleeve (1), and little cylinder sleeve (3) is fixedly connected with cylinder bottom head (5), and small piston (4) is slidingly connected with little cylinder sleeve (3); Small piston (4) forms small oil cavity (7) with little cylinder sleeve (3) and cylinder bottom head (5); Big piston (2) forms big oil pocket (6) with big cylinder sleeve (1), little cylinder sleeve (3) and cylinder bottom head (5), and small oil cavity (7) communicates with hydraulicchange-over valve (10) oil inlet P, control oil inlet K, solenoid directional control valve (11) oil outlet A1, and big oil pocket (6) is connected with hydraulicchange-over valve (10) oil outlet A;

Described hydraulicchange-over valve (10) comprises spool (13), top cover (14), spring seat (17), spring (15) and the hollow bolt (16) that is installed in cylinder bottom head; Hollow bolt is connected with oil sump (12) through pipeline, spool, pushes up and overlaps and can slide up and down, when spool (13) when being in initial position; Oil sump (12) communicates with big oil pocket (6) through spool (13); When spool (13) pressurized during to lower slider, oil sump (12) and big oil pocket (6) sealing, small oil cavity (7) is communicated with oil pocket (6) greatly.