CN200999772Y

CN200999772Y - Double-beat drop valve

Info

Publication number: CN200999772Y
Application number: CNU2007200370748U
Authority: CN
Inventors: 陈锦富
Original assignee: JIANGSU DINGSHENG HYDRAULIC CO Ltd
Current assignee: JIANGSU DINGSHENG HYDRAULIC CO Ltd
Priority date: 2007-04-30
Filing date: 2007-04-30
Publication date: 2008-01-02
Anticipated expiration: 2017-04-30

Abstract

A balancing valve. The utility model comprises a valve body, a controlling cover plate and an adjusting seat arranged on the both sides of the valve body, the valve is a separated element, A, B, and X oil mouths are respectively arranged on the valve body, two upper and lower transverse ducts are arranged between the A and B oil ducts, a single-way valve is arranged in the upper duct, a balancing valve is arranged in the lower duct, and a controlling valve is arranged on one side of the balancing valve facing the A duct. The valve body of the utility model adopts an integrated structure, the processing and installment are convenient, and the precision is high; a filtering device and a damper are arranged at the controlling mouth, effectively controlling the hydraulic oil flow amount, and not enabling the hanging arm to tremble during the work when an heavy object is declined. The structure of the utility model is reasonable, the precision is high, the motion is steady, and the reliability is high.

Description

Equilibrium valve

Technical field

The utility model relates to a kind of hydrovalve, relates in particular to the hydraulic control equilibrium valve that is used for crane system oil hydraulic circuit lifting gear.

Background technique

Engineering machinery in the modern times, in the machinery such as building machinery, widely applied the hydraulic pressure load bearing system, wherein equilibrium valve is the crucial hydraulic element of this type systematic, the quality of its performance directly affects machine performance, and existing hydraulically balanced valve mainly is made of control valve and equilibrium valve, common have two kinds of single-stage and leading types, single-stage equilibrium valve and control valve are for to connect side by side, the leading type equilibrium valve is nested the connection with control valve, but above-mentioned two kinds of hydraulically balanced valves are that the hydraulic pressure load bearing system is when load is descending in the common shortcoming that exists on the performance, the valve core opening of equilibrium valve is difficult to be stabilized on the definite openings of sizes, make and load on the phenomenon that produces low-frequency jitter in the decline process, cause system extremely unstable, have a strong impact on the safety reliability of complete machine, for this reason, a kind of new equilibrium valve is devised, as Chinese patent 95236163.9 " combined type integrated package hydraulically balanced valve ", this patent increases by a maintaining valve above original equilibrium valve and control valve, be combined into a hydraulic manifold block, be total to same valve body, and in hydraulic manifold block, be provided with some damping holes dexterously, eliminated the low-frequency jitter in the decline weight process, strengthened Security, made action more reliable.But this patent exists above defective to be: (1) in the operating mode that weight rises, flow flows out through the restriction of maintaining valve through opening degree, the pipeline of equilibrium valve again, makes flow resistance increase in the weight uphill process, and energy loss is serious, and efficient is low; (2) damping hole all is to decide the hole, so flow can only change with pressure, reacts relatively slow; (3) adjusting that the maximum opening degree of equilibrium valve can not be artificial has influenced its using scope.

The model utility content

Technical problem to be solved in the utility model is to overcome above-mentioned defective, and it is overall structure that a kind of valve body is provided, easily processing, highly sensitive, steady, the reliable equilibrium valve of taking action.

The technical solution of the utility model is: comprise valve body, be connected to the control cover plate and the adjustment seat of valve body both sides, described valve body is an independent component, on valve body, be respectively equipped with A, B, X hydraulic fluid port, be provided with upper and lower two horizontal passages between A, B oil duct, be provided with one-way valve in the upper channel, be provided with equilibrium valve in the lower channel, equilibrium valve is provided with control valve towards a side of A mouth passage.

On the oil inlet passage of control valve oil circuit, be provided with filtrating equipment, damping successively.

Described equilibrium valve is made up of a pair of valve pocket, balance valve seat, spring seat, spring, unidirectional valve seat, steel ball, and the balance valve seat is taper towards an end outer surface of A channel, and conical surface is provided with the multiple tracks skewed slot.

Described control valve comprises the control valve spool, and spool is provided with push rod towards an end of equilibrium valve, the push rod end face to the distance of steel ball less than the distance of spool end face to balance valve seat end face.

Valve body of the present utility model is an overall structure, and installation and processing is convenient, the precision height; Be provided with filtrating equipment, damping on the control mouth, can control the hydraulic oil flow momentum effectively, can not make arm at work, jitter phenomenon appears in weight when descending.The utility model is rational in infrastructure, the precision height, and action is steady, reliable rows is high.

Description of drawings

Fig. 1 is a structural representation of the present utility model

1 is valve body among the figure, the 2nd, and equilibrium valve, the 3rd, one-way valve, the 4th, B oil duct, the 5th, A oil duct, the 6th, control spool, the 7th, control cover plate;

Fig. 2 is the plan view of Fig. 1

Fig. 3 is a M-M view among Fig. 1

8 is dampings among the figure, the 9th, and filtrating equipment.

Fig. 4 is a schematic diagram of the present utility model

Embodiment

As Fig. 1,2,3, the utility model comprises valve body 1, is connected to the control cover plate 7 and the adjustment seat of valve body 1 both sides, and valve body 1 is different from combined type splicing structure in the prior art, is an independent component.Be respectively equipped with A, B, X hydraulic fluid port on valve body 1, A

oil duct

5,4 of B oil ducts are provided with upper and lower two passages, are provided with one-way valve 3 in the upper channel, are provided with equilibrium valve 2 in the lower channel, and the side towards A mouth passage of equilibrium valve 2 is provided with control valve.

On the oil inlet passage of control valve oil circuit, be provided with filtrating equipment 9, damping 8 successively.

Equilibrium valve 2 is made up of a pair of valve pocket, balance valve seat, spring seat, spring, unidirectional valve seat, steel ball, and the balance valve seat is taper towards an end outer surface of A channel 5, and conical surface is provided with the multiple tracks skewed slot.

Control valve comprises control valve spool 6, and spool 6 is provided with push rod towards an end of equilibrium valve 2, the push rod end face to the distance of steel ball less than the distance of spool end face to balance valve seat end face.

As Fig. 4, working principle of the present utility model is:

When the oil-feed of B hydraulic fluid port, promptly suspension hook rises by the A hydraulic fluid port, and hydraulic oil is directly by one-way valve 3.

When the oil return of A hydraulic fluid port, promptly suspension hook descends by the B hydraulic fluid port, by controlling control valve to X confession oil, by the control valve spool, makes the commutation of equilibrium valve main valve plug.

Because suspension hook need move balance when descending, and control rate of descent, on control mouthful oil circuit, be provided with filtrating equipment, damping, can held stationary when loading to guarantee suspension hook.

Claims

1, equilibrium valve, comprise valve body, be connected to the control cover plate and the adjustment seat of valve body both sides, it is characterized in that, described valve body is an independent component, on valve body, be respectively equipped with A, B, X hydraulic fluid port, be provided with upper and lower two horizontal passages between A, B oil duct, be provided with one-way valve in the upper channel, be provided with equilibrium valve in the lower channel, equilibrium valve is provided with control valve towards a side of A mouth passage.

2, equilibrium valve according to claim 1 is characterized in that, is provided with filtrating equipment, damping on the oil inlet passage of control valve oil circuit successively.

3, equilibrium valve according to claim 1, it is characterized in that, described equilibrium valve is made up of a pair of valve pocket, balance valve seat, spring seat, spring, unidirectional valve seat, steel ball, and the balance valve seat is taper towards an end outer surface of A channel, and conical surface is provided with the multiple tracks skewed slot.

4, equilibrium valve according to claim 3 is characterized in that, described control valve comprises the control valve spool, and spool is provided with push rod towards an end of equilibrium valve, the push rod end face to the distance of steel ball less than the distance of spool end face to balance valve seat end face.