CN103062147B - Hydraulic-control throttling valve, balance valve, engineering machine and hydraulic system for controlling winch - Google Patents

Hydraulic-control throttling valve, balance valve, engineering machine and hydraulic system for controlling winch Download PDF

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Publication number
CN103062147B
CN103062147B CN201310027043.4A CN201310027043A CN103062147B CN 103062147 B CN103062147 B CN 103062147B CN 201310027043 A CN201310027043 A CN 201310027043A CN 103062147 B CN103062147 B CN 103062147B
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China
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valve
hydraulic
control
throttling
spool
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CN201310027043.4A
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Chinese (zh)
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CN103062147A (en
Inventor
袁野
匡爱武
颜祯
张军花
胡道全
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中联重科股份有限公司
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Publication of CN103062147A publication Critical patent/CN103062147A/en
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Abstract

The invention discloses a hydraulic-control throttling valve, a balance valve, an engineering machine and a hydraulic system for controlling a winch. The hydraulic-control throttling valve of a slide valve structure comprises a valve body, a spool, an oil inlet, an oil outlet, a control port and a valve sleeve, control oil entering from the control port is capable of driving the valve spool to move axially, the valve sleeve is provided with a throttling window communicated with the oil outlet, and the spool is capable of moving axially in the valve sleeve to connect or disconnect a working oil way between the oil inlet and the throttling window. The balance valve uses the hydraulic-control throttling valve, the hydraulic system for controlling the winch uses the balance valve, and the engineering machine uses the hydraulic system. Therefore, the hydraulic-control throttling valve of the slide valve structure can be good in sealing stability and is convenient to process and manufacture.

Description

The hydraulic system of hydraulic-control throttling valve, equilibrium valve, control winch and engineering machinery

Technical field

The present invention relates to throttle valve field, particularly, the hydraulic system of the control winch of this equilibrium valve that relates to a kind of hydraulic-control throttling valve, uses the equilibrium valve of this hydraulic-control throttling valve, uses and use the engineering machinery of this hydraulic system.

Background technique

By in the hydraulic actuator loop of negative sense load (mainly gravity load), usual balance valve, in the luffing especially extensively seeing construction machinery hydraulic system and winding loop.Wherein typical equilibrium valve comprises one-way valve in parallel and hydraulic-control throttling valve.Such as, in the hydraulic system of the control elevator shown in Fig. 1, when be in transfer operating mode time, in order to control the speed that weight is transferred, enter the oily hydraulic-control throttling valve 1 can opened in equilibrium valve 9 of the control controlling mouth Y, and make working oil flow to oil outlet B from filler opening A by the restriction of hydraulic-control throttling valve, therefore can realize controlling the speed below weight under the effect of restriction.And when being in the lifting operating mode of weight, working oil can by flowing to filler opening A from oil outlet B via one-way valve 2, thus make equilibrium valve only play the effect of linking up oil circuit again after main reversing valve 81.

Can therefore, the effect of visible hydraulic-control throttling valve to equilibrium valve be most important, be the key that realize carrying out actuator speed governing.It should meet at least two technical requirementss:

1. good sealing.When restriction is not opened, the internal leakage of filler opening A to oil outlet B must control in indication range.

2. good fine motion characteristic.In the process that restriction is opened gradually, the changes in flow rate of filler opening A to oil outlet B must meet designing requirement, and usually require the flow trim when little opening and increase slowly, when middle big uncork, flow growth rate is greater than little opening, but still must be steadily controlled.

For meeting above-mentioned requirements, in the prior art, the spool design of hydraulic-control throttling valve is become conical surface seal form by widely used equilibrium valve usually, to ensure that equilibrium valve has good sealing property.On spool, drive the throttling groove of definite shape simultaneously, and valve port orifice size is changed with spool travel, to realize its fine motion characteristic.

But the equilibrium valve of existing common conical surface seal form has following shortcoming:

1. flow fine motion is poor.Comparatively greatly, the region that flow regulates with spool travel is short in the gain that conical surface orifice size changes with spool travel, and flow sudden change when starting that declines obviously, is unfavorable for mild whereabouts and the speed regulating control of weight.

2. conical surface seal poor effect under underload.This is because conical surface seal relies on spool closely to abut on valve seat under pressure, utilizes the self adaption of valve seat sharp edges to be out of shape and forms sealing area.And spool pressurized is more weak time low pressure (i.e. underload), its seating force that reclines is less, and sealing area forms deficiency, therefore sealing effect is poor.

3. complex process degree is higher.For ensureing good flow fine motion, directly at the conical surface of spool, or must offer throttling groove on the straightway of spool, these two kinds of modes all add the complexity that spool manufactures.

Summary of the invention

An object of the present invention is to provide a kind of hydraulic-control throttling valve, this hydraulic-control throttling valve low pressure seal is more excellent, and flow fine motion is good, and structure is simple, easily manufactured.

Another object of the present invention is to provide a kind of equilibrium valve, and this equilibrium valve uses hydraulic-control throttling valve provided by the invention.

Another object of the present invention is to provide a kind of hydraulic system controlling winch, and this hydraulic system uses equilibrium valve provided by the invention.

An also object of the present invention is to provide a kind of engineering machinery, and this project machinery uses the hydraulic system of control winch provided by the invention.

To achieve these goals, according to an aspect of the present invention, a kind of hydraulic-control throttling valve is provided, comprise valve body and spool, and described hydraulic-control throttling valve comprises filler opening, oil outlet and control mouth, the control oil entered from described control mouth can drive described spool to move axially, wherein, described hydraulic-control throttling valve is sliding valve structure, and comprise the valve pocket be arranged in described valve body, this valve pocket offers the throttling window be communicated with described oil outlet, described spool can move axially with conducting or the working oil path that disconnects between described filler opening and described throttling window in described valve pocket.

Preferably, described spool comprises the first circular groove be communicated with described filler opening and the first convex shoulder being positioned at this first circular groove one end, when described working oil path disconnects, described first convex shoulder separates described first circular groove and described throttling window, when described working oil path conducting, described first circular groove is communicated with described throttling window.

Preferably, described valve pocket is removably mounted on described valve body, and described hydraulic-control throttling valve comprises Returnning spring, and one end of described Returnning spring is supported on described valve pocket, and the other end supports described spool.

Preferably, the sidewall of described valve pocket is circumferentially formed with multiple described throttling window, the plurality of throttling window is communicated with described oil outlet by the second circular groove be formed on described valve pocket outer wall.

Preferably, one end of described second circular groove is formed with valve pocket convex shoulder, is provided with the 3rd Sealing between this valve pocket convex shoulder and described valve body.

Preferably, described hydraulic-control throttling valve comprises the guide valve blocks with described control mouth, and this guide valve blocks is removably mounted on described valve body, and described guide valve blocks inside is provided with the guide valve blocks throttle orifice being communicated with described control mouth and described spool.

Preferably, described spool comprises the second convex shoulder separating described control mouth and described working oil path, and is provided with the first Sealing between this second convex shoulder and inwall of described valve body.

Preferably, described valve core inside forms axial hole, and this axial hole is near the first port closed of described throttling window, and the second port away from described throttling window is communicated with described control mouth, and this second port is formed with throttling spool hole.

Preferably, described axial hole comprises successively adjacent first paragraph, second segment and the 3rd section, and wherein said first paragraph is formed as described throttling spool hole, and the passage section of described first paragraph, second segment and the 3rd section becomes large successively.

Preferably, described valve pocket inside is provided with valve rod, and this valve rod stretches in described first port of described spool, and is provided with the second Sealing between the inwall of the outer wall of described valve rod and described spool.

According to a further aspect in the invention, a kind of equilibrium valve is provided, comprise hydraulic-control throttling valve in parallel and one-way valve, described hydraulic-control throttling valve is hydraulic-control throttling valve provided by the invention, the forward hydraulic fluid port of wherein said one-way valve is the described oil outlet of described hydraulic-control throttling valve, and reverse hydraulic fluid port is the described filler opening of described hydraulic-control throttling valve.

In accordance with a further aspect of the present invention, a kind of hydraulic system controlling winch is provided, comprise the oil hydraulic motor of the described winch of pressure oil-source, fuel tank, main reversing valve and driving, described main reversing valve can control the motion of described oil hydraulic motor, the at least side oil circuit of described oil hydraulic motor is provided with equilibrium valve provided by the invention, described filler opening is communicated with the actuator port of described oil hydraulic motor, described oil outlet is communicated with the actuator port of described main reversing valve, and described control mouth is communicated with the opposite side oil circuit of described oil hydraulic motor.

There is provided a kind of engineering machinery also on the one hand according to of the present invention, this project machinery comprises winch and controls the hydraulic system of this winch, and described hydraulic system is the hydraulic system of control winch provided by the invention.

Pass through technique scheme, because hydraulic-control throttling valve provided by the invention adopts sliding valve structure, when spool starts, by controlling the axial seal length of spool and valve pocket with consecutive damper valve internal leakage, thus the accurate control of flow fine motion when realizing the little opening started at spool, when spool big uncork, flow fine motion is then realized by the specific throttling window under coordinating with spool, therefore the scope of whole Flow-rate adjustment is expanded, especially, this segmented gain regulative mode realized by designing different throttle window mouth-shapeds is highly suitable for equilibrium valve smooth starting, the accurate application characteristic of speed governing, cone valve form throttle valve of the prior art then cannot the change of good control valve internal leakage, therefore it is when starting, namely during little opening, fine motion is difficult to control, when being applied to equilibrium valve, unfavorable to the stability of hydraulic system.In addition, when high low pressure load variations, than existing cone valve structure throttle valve, the axis seal length between sliding valve structure throttle valve through hole spool provided by the invention and valve pocket, can obtain and seal stability preferably.In addition, because the throttling window with throttling action is opened on valve pocket, facilitate manufacturing, there is good manufacturability.Above-mentioned advantage makes equilibrium valve provided by the invention, hydraulic system and engineering machinery all have higher practicability.

Other features and advantages of the present invention are described in detail in embodiment part subsequently.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:

Fig. 1 is the structural principle schematic diagram of the hydraulic system controlling winch;

Fig. 2 is the sectional structure schematic diagram of equilibrium valve provided by the invention;

Fig. 3 to Fig. 5 is the broken section structural representation of hydraulic-control throttling valve provided by the invention in the process realizing throttling action;

Fig. 6 is the portion of external structural representation of hydraulic-control throttling valve provided by the invention, and wherein throttling window is rectangle;

Fig. 7 is the portion of external structural representation of hydraulic-control throttling valve provided by the invention, and wherein throttling window is triangle;

Fig. 8 is the portion of external structural representation of hydraulic-control throttling valve provided by the invention, and wherein throttling window is circular;

Fig. 9 is under difformity throttling window, and hydraulic-control throttling valve provided by the invention is from filler opening A to the change curve that the flow of oil outlet B realizes with the change in displacement of spool.

Description of reference numerals

1 hydraulic-control throttling valve 2 one-way valve

3 throttling window 5 axial holes

7 Returnning spring 9 equilibrium valves

11 spool 12 valve pockets

13 valve rod 14 valve bodies

15 guide valve blocks 21 inner elements of check valves

22 check valve spring 23 radial direction through hole

31 first circular groove 32 second circular grooves

41 first convex shoulder 42 second convex shoulders

43 valve pocket convex shoulder 51 first paragraphs

52 second segments 53 the 3rd section

61 first Sealing 62 second Sealings

63 the 3rd Sealing 81 main reversing valves

82 winch 83 oil hydraulic motors

15a guide valve blocks throttle orifice 5a throttling spool hole

A filler opening B oil outlet

Y controls mouth

Embodiment

Below in conjunction with accompanying drawing and for equilibrium valve provided by the invention, the embodiment of hydraulic-control throttling valve provided by the invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.Such as, this hydraulic-control throttling valve, except being applied in except in equilibrium valve, can also be applied to other field, and the distortion of this application drops in protection scope of the present invention equally.In addition, the filler opening A mentioned herein and oil outlet B is the relative concept of hydraulic-control throttling valve 1 provided by the invention for convenience of description, in equilibrium valve, fluid can also be entered from oil outlet B by one-way valve 9 and flow out from filler opening A, therefore, the implication of the term in the present invention is not limited to its dictionary meanings, but is construed as the implication that those skilled in the art can expect based on design of the present invention.

First, Fig. 1 show comprise that can be used by engineering machinery provided by the invention with schematic diagram that is a kind of typical structure of the hydraulic system of control winch of the prior art.Wherein, in the whereabouts operating mode of weight, by the throttling action of the hydraulic-control throttling valve 1 in the equilibrium valve 9 of setting, the object controlling weight-drop speed can be realized.And when weight hoists, be then communicated with working oil path by the one-way valve 2 in the equilibrium valve 9 that arranges, so that the operating mode that hoists of weight can be realized, and can prevent from occurring to prevent weight from falling in the decompression situation that such as oil pipe burst causes.Therefore equilibrium valve 9 can play speed limit and locked effect.

As shown in Figure 2, the invention provides a kind of hydraulic-control throttling valve, comprise valve body 14 and spool 11, and hydraulic-control throttling valve comprises filler opening A, oil outlet B and controls mouth Y, the control oil entered from control mouth Y can drive spool 11 to move axially, to make the working oil path between filler opening A and oil outlet B be turned on or off, thus realize the function of hydraulic control valve.Wherein, in order to make the structure of hydraulic-control throttling valve simple, normally, one end of spool is provided with Returnning spring 7, thus after the oily off-load of control, can be automatically reset by this Returnning spring 7.In addition, in some hydraulic control valve, all can arrange in the both sides of spool and control mouth Y, to control moving back and forth of spool respectively.Should drop on equally in protection scope of the present invention for this type of distortion.

In order to realize object of the present invention, hydraulic-control throttling valve 1 provided by the invention is sliding valve structure, and comprise the valve pocket 12 be arranged in valve body 14, this valve pocket 12 offers the throttling window 3 be communicated with oil outlet B, spool 11 can move axially with the working oil path between conducting or disconnection filler opening A and throttling window B in valve pocket 12.Therefore, by above-mentioned sliding valve structure, hydraulic-control throttling valve 1 provided by the invention can ensure the sealing effect of hydraulic-control throttling valve by the axial length of spool 11 and radial clearance, even therefore when low-voltage load, also can avoid the poorly sealed problem that cone valve occurs, thus make the sealing effect of hydraulic-control throttling valve provided by the invention under high low pressure load all comparatively stable.And importantly, in the present invention, because the throttling window 3 with throttling action is opened on valve pocket 12, therefore, when the throttling fine motion that can ensure hydraulic-control throttling valve, manufacturing is facilitated, wherein, do not need to carry out complicated processing to spool, on spool, such as process the throttling groove etc. of various complexity, thus there is good manufacturability, only need to complete offering of throttling window 3 on valve pocket 12 by equipment such as linear cutting machines.Wherein follow-up 3 to Fig. 9 is by reference to the accompanying drawings introduced the fine motion adjustment process of hydraulic-control throttling valve provided by the invention in detail

It should be noted that, the mode of execution that can realize technique scheme has multiple, set-up mode of such as spool 11, valve pocket 12 and throttling window 3 etc., the present invention for convenience of description, in this introduction preferred implementation wherein, this preferred implementation, only for illustration of the present invention, is not limited to the present invention.

In preferred implementation as shown in Figures 2 to 6, spool 11 comprises the first circular groove 31 be communicated with filler opening A and the first convex shoulder 41 being positioned at this first circular groove 31 one end, when working oil path disconnects, first convex shoulder 41 separates the first circular groove 31 and throttling window 3, when working oil path conducting, the first circular groove 31 is communicated with throttling window 3.Thus realize conducting and the disconnection of working oil path.Wherein the first convex shoulder 41 is preferably formed in spool 11 end, and to facilitate processing, other first circular groove 31 and the first convex shoulder 41 are arc transition, thus make the energy loss of the hydraulic oil in working oil path few.And wherein, first convex shoulder 41 forms clearance seal with valve pocket 12 inwall, sealing effect is subject to the axial seal length of the first convex shoulder 41 in valve pocket 12, and first convex shoulder 41 affect with the radial clearance of valve pocket 12 inwall, especially, the present invention controls the seal length of the first convex shoulder 41 and valve pocket 12 by the displacement of change spool 11, thus it is interior from filler opening A to the leakage rate of oil outlet B to change valve, realizes the flow fine motion when spool starts.

In addition, in a preferred embodiment of the invention, the sidewall of valve pocket 12 is circumferentially formed with multiple throttling window 3, the plurality of throttling window 3 is communicated with oil outlet B by the second circular groove 32 be formed on valve pocket 12 outer wall, improving flow.Particularly, in the present invention, throttling window 3 is four that circumferentially arrange at equal intervals, and certainly, in other NM mode of executions, the quantity of window can also be less or more, all should drop in protection scope of the present invention for this distortion.In addition, as shown in Figure 6 to 8, the shape of throttling window 3 can be rectangle, circle, triangle or other various shapes, and the present invention does not limit this.Wherein as shown in Figure 6, for throttling window in the preferred embodiment of the present invention 3 for rectangle, this wherein can make rectangular window length vertically be Xc, width is k, wherein spool 11 is under the driving controlling oil, can by regulate length Xc and the working oil path of rectangular window be communicated with number realize the different restriction effects of hydraulic-control throttling valve 1, namely realize flow fine motion adjustment.Wherein width k, then for spool move time, by the flow gain of hydraulic-control throttling valve 1.Now this flow gain keeps constant, namely as shown in Figure 9, changes in flow rate is line style change, and when throttling window 3 be triangle (see Fig. 7) or circular (see Fig. 8) or etc. shape time, to be changed at any time by the flow increase of hydraulic-control throttling valve 1, particularly, as shown in Figure 9, when throttling window 3 is triangle, the curved change of changes in flow rate from filler opening A to oil outlet B, and when throttling window 3 is circular, this changes in flow rate then presents waveform change, in addition, also different changes in flow rate can be presented when adopting the shapes such as other such as rhombuses, the present invention does not do at this and too much repeats, various designs for throttling window 3 all should drop in protection scope of the present invention.Concrete Variations in Flow Changes describes in detail in follow-up for the form of rectangular window.

In addition, in a preferred embodiment of the invention, valve pocket 12 is removably mounted on valve body 14, particularly, installs by fastening pieces such as screws.Wherein, one end of the Returnning spring 7 in hydraulic-control throttling valve 1 is supported on valve pocket 12, and the other end then supports spool 11, thus realizes the self-return of spool 11.

Particularly, in housing configuration, one end of the second above-mentioned circular groove 32 is formed with valve pocket convex shoulder 43, this valve pocket convex shoulder 43 contacts with the inner tight of valve body 14, and more preferably, be provided with the 3rd Sealing 63 between this valve pocket convex shoulder 43 and valve body 14, so that the sealing of hydraulic-control throttling valve provided by the invention can be increased further, reduce the leakage of fluid.Wherein the Sealing such as first, second, and third Sealing provided by the present invention can be the Sealings well known in the art such as O type circle, can be significantly improved the sealing of hydraulic-control throttling valve by these Sealings.In addition, preferably, the flange that the other end of the second circular groove 32 can be utilized to be formed supports valve body 14, is fixed by fastening piece to facilitate.Make hydraulic-control throttling valve provided by the invention and the convenient processing of equilibrium valve and assemble.

In a preferred embodiment of the invention, filler opening A and oil outlet B is formed on valve body 14, in order to convenient assembling and maintenance, hydraulic-control throttling valve 1 comprises the guide valve blocks 15 having and control mouth Y, that is, control mouth Y shape to become on the guide valve blocks 15 that can disassemble, wherein guide valve blocks 15 and valve body 14 can adopt grafting etc. removably mode be connected, and be provided with all kinds of Sealing each other, to make the working oil in control oil and working oil path mutually isolated.Wherein.Importantly, guide valve blocks 15 inside provided by the invention is provided with the guide valve blocks throttle orifice 15a being communicated with and controlling mouth Y and spool 11, therefore, first the control oil entered from control mouth Y will enter throttling by guide valve blocks throttle orifice 15a, its effect is more similar to wave filter, can alleviate and control oily fluctuation to the impact of spool 11, improve the stability of motions of spool 11.

In addition, in order to seal the working oil controlled in oil and working oil path further, preferably, spool 11 comprises the second convex shoulder 42 separating and control mouth Y and working oil path, this second convex shoulder 42 contacts with the inner tight of valve body 14, and more preferably, the first Sealing 61 is provided with between this second convex shoulder 42 and inwall of valve body 14, to promote the sealing of hydraulic-control throttling valve 1, wherein more preferably, in order to the integrity of poppe tvalve core 11, and convenient manufacture, this second convex shoulder 42 is the other end of the first circular groove 31.That is, the first circular groove 31 is formed by the first convex shoulder 41 and the second convex shoulder 42.

Wherein, in order to the stability of motions of further poppe tvalve core, preferably, spool 11 inside forms axial hole 5, this axial hole 5 is near the first port closed of throttling window 3, the second port away from throttling window 3 is communicated with control mouth Y, therefore, control oil can first enter in axial hole 5 before driving spool 11, thus the impact alleviated spool 11, and more preferably, throttling spool hole 5a is formed in this second port, therefore when the speed Rapid Variable Design of spool 4, this throttling spool hole 5a can produce hypotensive effect, make the motion stabilization of spool.Wherein in order to this antihypertensive effect auxiliary, preferably, valve pocket 12 inside is provided with valve rod 13, this valve rod 13 can stretch in the first port of spool 11, and be provided with the second Sealing 62 between the inwall of the outer wall of valve rod 13 and spool 11, therefore the first port of this spool 11 can be closed by valve rod 13, but with common closed mode unlike, valve rod 13 can produce relative movement with spool 11, namely when spool 11 rapid movement, oil is controlled owing to being full of in axial hole 5, this control oil can by throttling spool hole 5a discrepancy axial hole 5, thus the resistance produced in contrast to spool 11 movement velocity, make the motion of spool 11 more reliable and more stable, to strengthen hydraulic-control throttling valve 1 further when being applied to equilibrium valve 9 grade, the motion of actuator can be made more stable, there will not be the problems such as out of control, reliability is higher.

Wherein more specifically, axial hole 5 comprises successively adjacent first paragraph 51, second segment 52 and the 3rd section 53, and wherein first paragraph 51 is formed as throttling spool hole 5a, and the passage section of first paragraph 51, second segment 52 and the 3rd section 53 becomes large successively.Therefore due to the design of this variable cross section, make to control the motion of oil in axial hole more stable, thus also can the stability of poppe tvalve core motion.

Above describe the structure of the hydraulic-control throttling valve that the preferred embodiment for the present invention provides, the throttling window 3 below in conjunction with Fig. 3 to Fig. 9 rectangle introduces its specific works process for example.

First, as shown in Figure 3, when the pretightening force of the control-oil pressure controlling mouth Y higher than Returnning spring 7, the right motion of spool 11 will be promoted.If spool 4 displacement X≤Xd, because the first convex shoulder 41 being now positioned at spool 11 end does not also enter throttling window 3, the fluid of filler opening A flows to oil outlet B by the first convex shoulder 41 with the gap of valve pocket 12 inwall, and now, this small internal leakage can be used as the vernier control of actuator.In fig .9, internal leakage is now first flow qc, and this first flow qc is a horizontal linear substantially.

Then, as shown in Figure 4, when the control-oil pressure controlling mouth Y continues to raise, during the displacement Xd < X < Xd+Xs of spool 11, now the first convex shoulder 41 progresses into throttling window 3 along with the growth of the displacement X of spool 11, namely, axial seal length between spool 11 and valve pocket 14 reduces, now, filler opening A increases gradually to the internal leakage of oil outlet B, thus realizes flow fine motion when spool starts.Particularly, now the displacement x of this internal leakage and spool 11 meets formula below:

q x = &pi;d &delta; 3 12 &mu; [ x d + x s - x ] &Delta; p f

Wherein: qx is interior amount of leakage; Δ pf is the pressure drop between filler opening A and oil outlet B; δ is the matching gap of spool 11 and valve pocket 12; μ is the kinetic viscosity of fluid; D is spool 11 external diameter.

Therefore, the linear change from first flow qc to the second flow qd is substantially rendered as from filler opening A to the internal leakage of oil outlet B.Namely increase with x, then internal leakage also increases.

As shown in Figure 5 and Figure 6, when the control-oil pressure controlling mouth Y mouth raises further, during spool 11 displacement X > Xd+Xs, now the first convex shoulder 41 enters throttling window 3 completely, sealing between spool 11 and valve pocket 14 is disappeared, and the length that the first convex shoulder 41 enters throttling window 3 is Xw.Now, the working oil path between filler opening A to oil outlet B is by throttling window 3 conducting, and now, at the throttling window 3 times of this rectangle, the displacement X of flow area Sw and spool 11 meets relation below:

Sw=4 × k × Xw=4 × k × (X-Xd-Xs), and Xd+Xs < X < Xd+Xs+Xc

Wherein: k-be rectangle throttling window width, i.e. flow gain

Simultaneously, for sharp edge throttling, (sharp edge throttling is specialized vocabulary in related domain, specifically can with reference to all kinds of document, such as: " sharp edge throttling cellular type liquid damping device "-" detection and control journal " the 03rd phase author: Lei Cunfang in 1984, Kang Lingyong, Lu Chongxi, Yang Shixing), flow meets formula below:

Q = C d S w 2 &Delta;P &rho; = 4 C d k ( x - x d - x s ) 2 P L &rho;

Wherein: Cd-sharp edge restriction coefficient, Δ P-restriction pressure drop, PL-induced pressure, ρ-fluid density.

Can find out except spool travel X, in a flow restriction control, other parameters remain unchanged substantially.Therefore, can be regulated by spool travel X by the flow Q of restriction, make flow progressively be elevated to peak rate of flow Qm, thus realize carrying out throttle grverning operation to the working oil of working oil path.It should be noted that, as shown in Figure 9, inventive flow fine motion is respectively by 0 to Xd, Xd to Xd+Xs, Xd+Xs to Xd+Xs+Xc three sections realization, every section all has different flow gains, and first paragraph gain is 0 substantially, is applicable to finely tune operating mode, such as hoisting mechanism, now elevator brake is opened, and hoist motor slowly transfers object to certain immovable point because of the internal leakage of spool 11, realizes precisely controlling; Second segment gain is risen gently, is beneficial to very much the mild startup of motor, and the 3rd section of gain can be arranged according to the throttling window of particular form (rectangle, circle, triangle, rhombus etc.), can extensively be adapted to all kinds of operating mode.Therefore the internal leakage of hydraulic-control throttling valve provided by the invention is by the throttling window of design on valve pocket 12, micro-positioning regulators function admirable.Be particularly useful in equilibrium valve.

Therefore, in a kind of equilibrium valve that the present invention also provides, comprise one-way valve 2, this one-way valve 2 is in parallel with hydraulic-control throttling valve 1 provided by the invention, and, in order to realize the principle of equilibrium valve, the forward hydraulic fluid port of one-way valve 1 is the oil outlet B of hydraulic-control throttling valve 1, and reverse hydraulic fluid port is the filler opening A of hydraulic-control throttling valve 1.Wherein those skilled in the art can know, the implication of the forward hydraulic fluid port of one-way valve is that the hydraulic oil that flows into from this forward hydraulic fluid port can by this one-way valve, and oppositely the implication of hydraulic fluid port is that the hydraulic oil that flows into from this reverse hydraulic fluid port is not by this one-way valve.Its specific works process can be introduced in conjunction with the hydraulic system of control winch provided by the invention.

Wherein in the hydraulic system of control winch provided by the invention, comprise pressure oil-source P, fuel tank T, the oil hydraulic motor 83 of main reversing valve 81 and driving winch 82, main reversing valve 81 can the motion of hydraulic control motor 83, this main reversing valve 81 can control actuator's work for various, quit work and the valve member in converting motion direction, H-shaped three position four-way directional control valve such as shown in Fig. 1, by the control of this three position four-way directional control valve, can hydraulic control motor 83 work whether or rotate forward, reversion, its controlling method is conventionally known to one of skill in the art, do not do at this and too much repeat, the braking members well known in the art such as rotary braking cylinder can also be set in addition and ensure the Security that hoist or fall of winch at weight.Wherein, in order to realize object of the present invention, the at least side oil circuit of oil hydraulic motor 83 is provided with equilibrium valve 9 provided by the invention, filler opening A is communicated with the actuator port of oil hydraulic motor 83, oil outlet B is communicated with the actuator port of main reversing valve 81, and controls mouth Y and be communicated with the opposite side oil circuit of oil hydraulic motor 83.

Therefore, in real work, when be in weight transfer operating mode time, in order to control the speed that weight is transferred, enter the oily hydraulic-control throttling valve 1 can opened in equilibrium valve 9 of the control controlling mouth Y, and make working oil flow to oil outlet B from filler opening A by the throttling window 3 of hydraulic-control throttling valve, therefore, under the effect of throttling window 3, the speed that control weight is transferred can be realized.And when being in the lifting operating mode of weight, working oil can flow to filler opening A from oil outlet B via one-way valve 2 again after main reversing valve 81, thus equilibrium valve is made only to play the effect of linking up oil circuit.Therefore, it is possible to make equilibrium valve 9 realize in hydraulic system the speed limit of actuator and the function such as locked.After particularly applying hydraulic-control throttling valve provided by the invention, effectively can promote the low pressure area sealing of equilibrium valve, and the micro-positioning regulators performance of flow has had larger lifting, therefore, it is possible to provide operational security and the reliability of the engineering machinery such as such as hoist, there is higher practicability and promotional value.

Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.

It should be noted that in addition, each concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.

In addition, also can carry out combination in any between various different mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (13)

1. a hydraulic-control throttling valve, comprise valve body (14) and spool (11), and described hydraulic-control throttling valve comprises filler opening (A), oil outlet (B) and control mouth (Y), the control oil entered from described control mouth (Y) can drive described spool (11) to move axially, it is characterized in that, described hydraulic-control throttling valve (1) is sliding valve structure, and comprise the valve pocket (12) be arranged in described valve body (14), this valve pocket (12) offers the throttling window (3) be communicated with described oil outlet (B), described spool (11) can move axially with conducting or the working oil path that disconnects between described filler opening (A) and described throttling window (3) in described valve pocket (12).
2. hydraulic-control throttling valve according to claim 1, it is characterized in that, described spool (11) comprises the first circular groove (31) be communicated with described filler opening (A) and the first convex shoulder (41) being positioned at this first circular groove (31) one end, when described working oil path disconnects, described first convex shoulder (41) separates described first circular groove (31) and described throttling window (3), when described working oil path conducting, described first circular groove (31) is communicated with described throttling window (3).
3. hydraulic-control throttling valve according to claim 1, it is characterized in that, described valve pocket (12) is removably mounted on described valve body (14), and described hydraulic-control throttling valve (1) comprises Returnning spring (7), one end of described Returnning spring (7) is supported on described valve pocket (12), and the other end supports described spool (11).
4. hydraulic-control throttling valve according to claim 1, it is characterized in that, the sidewall of described valve pocket (12) is circumferentially formed with multiple described throttling window (3), the plurality of throttling window (3) is communicated with described oil outlet (B) by the second circular groove (32) be formed on described valve pocket (12) outer wall.
5. hydraulic-control throttling valve according to claim 4, it is characterized in that, one end of described second circular groove (32) is formed with valve pocket convex shoulder (43), is provided with the 3rd Sealing (63) between this valve pocket convex shoulder (43) and described valve body (14).
6. hydraulic-control throttling valve according to claim 1, it is characterized in that, described hydraulic-control throttling valve (1) comprises the guide valve blocks (15) with described control mouth (Y), this guide valve blocks (15) is removably mounted on described valve body (14), and described guide valve blocks (15) inside is provided with the guide valve blocks throttle orifice (15a) being communicated with described control mouth (Y) and described spool (11).
7. hydraulic-control throttling valve according to claim 1, it is characterized in that, described spool (11) comprises the second convex shoulder (42) separating described control mouth (Y) and described working oil path, and is provided with the first Sealing (61) between the inwall of this second convex shoulder (42) and described valve body (14).
8. hydraulic-control throttling valve according to claim 1, it is characterized in that, described spool (11) inside forms axial hole (5), this axial hole (5) is near the first port closed of described throttling window (3), the second port away from described throttling window (3) is communicated with described control mouth (Y), and this second port is formed with throttling spool hole (5a).
9. hydraulic-control throttling valve according to claim 8, it is characterized in that, described axial hole (5) comprises successively adjacent first paragraph (51), second segment (52) and the 3rd section (53), wherein said first paragraph (51) is formed as described throttling spool hole (5a), and the passage section of described first paragraph (51), second segment (52) and the 3rd section (53) becomes large successively.
10. hydraulic-control throttling valve according to claim 8, it is characterized in that, described valve pocket (12) inside is provided with valve rod (13), this valve rod (13) stretches in described first port of described spool (11), and is provided with the second Sealing (62) between the inwall of the outer wall of described valve rod (13) and described spool (11).
11. 1 kinds of equilibrium valves, comprise hydraulic-control throttling valve (1) in parallel and one-way valve (2), it is characterized in that, described hydraulic-control throttling valve (1) is for according to the hydraulic-control throttling valve (1) in claim 1-10 described in any one, the forward hydraulic fluid port of wherein said one-way valve (2) is the described oil outlet (B) of described hydraulic-control throttling valve (1), and reverse hydraulic fluid port is the described filler opening (A) of described hydraulic-control throttling valve (1).
12. 1 kinds of hydraulic systems controlling winch, comprise pressure oil-source (P), fuel tank (T), the oil hydraulic motor (83) of main reversing valve (81) and the described winch of driving (82), described main reversing valve (81) can control the motion of described oil hydraulic motor (83), it is characterized in that, the at least side oil circuit of described oil hydraulic motor (83) is provided with equilibrium valve according to claim 11 (9), described filler opening (A) is communicated with the actuator port of described oil hydraulic motor (83), described oil outlet (B) is communicated with the actuator port of described main reversing valve (81), described control mouth (Y) is communicated with the opposite side oil circuit of described oil hydraulic motor (83).
13. 1 kinds of engineering machinery, this project machinery comprises winch (82) and controls the hydraulic system of this winch, and it is characterized in that, described hydraulic system is the hydraulic system of control winch according to claim 12.
CN201310027043.4A 2013-01-24 2013-01-24 Hydraulic-control throttling valve, balance valve, engineering machine and hydraulic system for controlling winch CN103062147B (en)

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CN104653539B (en) * 2015-03-02 2016-08-24 郑州宇通重工有限公司 A kind of proportional hydraulic balanced valve
CN104963905B (en) * 2015-06-29 2017-04-12 象山盛韵汽配科技有限公司 Two-stage overflow unloading valve
CN105135019B (en) * 2015-10-13 2018-03-16 徐州重型机械有限公司 Balanced valve and engineering machinery
CN106949110B (en) * 2017-04-10 2018-10-19 四川长江液压件有限责任公司 A kind of pump flow stabilizing valve
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CN202575822U (en) * 2012-06-04 2012-12-05 中联重科股份有限公司 Engineering machinery and hoisting hydraulic control system thereof
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CN2173318Y (en) * 1993-09-21 1994-08-03 机械电子工业部西安重型机械研究所 Moving valve sleeve slide valve type valve for stopping flow
CN2218859Y (en) * 1995-06-06 1996-01-31 李红军 Column throttling valve
DE19755120A1 (en) * 1997-02-27 1998-09-03 Mannesmann Rexroth Ag Pilot operated check valve
CN1356481A (en) * 2001-12-27 2002-07-03 卢永松 Balancing valve
CN200999772Y (en) * 2007-04-30 2008-01-02 江苏鼎晟液压有限公司 Double-beat drop valve
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CN102889261A (en) * 2012-10-15 2013-01-23 常德中联重科液压有限公司 Balancing valve, hydraulic cylinder telescoping control loop and hydraulic device

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