CN102155450A - Hydraulic system of crane and shock-resistance valve thereof - Google Patents
Hydraulic system of crane and shock-resistance valve thereof Download PDFInfo
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- CN102155450A CN102155450A CN2011100998298A CN201110099829A CN102155450A CN 102155450 A CN102155450 A CN 102155450A CN 2011100998298 A CN2011100998298 A CN 2011100998298A CN 201110099829 A CN201110099829 A CN 201110099829A CN 102155450 A CN102155450 A CN 102155450A
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Abstract
The invention discloses a shock-resistance valve. A valve body of the shock-resistance valve is provided with an oil inlet, an oil return opening and a feedback oil opening; a valve chamber of the shock-resistance valve is provided with a regulating valve plug internally which controls the connection and disconnection of the oil inlet and the oil return opening; the valve chamber comprises a left chamber and a right chamber which are formed by the separation of the regulating valve plug; the oil inlet is communicated with the left chamber; the feedback oil opening is communicated with the right chamber; and an elastic component is arranged between the regulating valve plug and the axial chamber wall of the right chamber. The oil inlet of the shock-resistance valve is communicated with a main oil way; the feedback oil opening is communicated with a feedback oil way; when the pressure of the main oil way is increased abruptly, the pressures which acts on two sides of the regulating valve plug are different, when the pressure difference exceeds a set value of a pressure-regulating spring, a communicated oil opening of the oil return opening and the oil inlet is opened, the hydraulic oil of the main oil way flows back the oil return tank from the oil return opening for unloading, thus the role of shock-resistance is played; and the shock-resistance valve is directly communicated with the main oil way, the pressure peak value of the main oil way can be timely cut down, and shock-resistance is realized timely. The invention also discloses a hydraulic system of a crane comprising the shock-resistance valve.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of shock resistance valve.The invention still further relates to a kind of crane hydraulic system that comprises above-mentioned shock resistance valve.
Background technique
Hydraulic system mainly is made up of dynamical element, control main valve, executive component and some auxiliary devices, for the stable hydraulic system, usually the feedback oil circuit need be set, and generally feeds back by the form of pressure.Dynamical element has the discharge capacity control unit, and the feedback oil circuit feeds back to the discharge capacity control unit with the feedback signal of system pressure value, and then the discharge capacity control unit can rationally be controlled the discharge capacity of dynamical element according to this feedback signal, and then the stable hydraulic system.
Connect by pipeline between each element of hydraulic system, based on multiple factor, system can produce pressure surge, as following cause: during load variations, because the signal transmission of feedback oil circuit needs the regular hour, then the variation of load can not be passed to the discharge capacity control unit of dynamical element timely, and the pressure of system may raise in this passing time, and then produces hydraulic shock; Even the feedback oil circuit in time is passed to feedback signal the discharge capacity control unit, the discharge capacity control unit also needs certain response time, can not be in time carry out the flow adjustment according to required, such as, work as system start-up, when working connection pressure is set up prior to feedback pressure, oil hydraulic pump as dynamical element can be swung toward maximum pump discharge, foundation along with feedback pressure, the hydraulic pressure pump delivery can adapt to the traffic demand of control main valve automatically, be that oil hydraulic pump can change the demand of controlling main valve to adapt to toward little discharge capacity, but because the restriction of oil hydraulic pump its own inertial may swing toward float amount direction in time, and flow and pressure is coupled relation, will set up elevated pressures this moment at working connection, produces hydraulic shock; Moreover also can there be certain output fluctuation in dynamical element itself based on its working principle, and for example, all there are certain pulsation problem in gear pump and plunger pump, and this problem can't be solved by the feedback oil circuit; In addition, the outsides such as variation of the variation of the amount of deformation of rigid mechanism and recovery, sound state change the variation that also can cause system pressure naturally, form hydraulic shock.
Therefore, how to provide a kind of response timely anti-impact device be those skilled in the art's technical issues that need to address.
Summary of the invention
An object of the present invention is to provide a kind of shock resistance valve, this shock resistance valve by working connection with the feedback oil circuit pressure ratio, can play the shock resistance effect, thereby keep the pressure stability of system in time with the surge pressure off-load of system.Another object of the present invention provides a kind of crane hydraulic system that comprises above-mentioned shock resistance valve.
For reaching first purpose of the present invention, the invention provides a kind of shock resistance valve, have filler opening, return opening and feedback hydraulic fluid port on its valve body; Be provided with in its valve pocket along described valve pocket and move axially to control the regulating spool of described filler opening and described return opening break-make, described valve pocket comprises by described regulating spool cuts apart left chamber and the right chamber that forms, described filler opening is communicated with described left chamber, described feedback hydraulic fluid port is communicated with described right chamber, is provided with elastic member between the axial cavity wall of described regulating spool and described right chamber.
Preferably, described regulating spool has the big footpath of left end section, middle part path section and the big footpath of right-hand member section, described middle part path section is communicated with described filler opening with the intermediate cavity that described valve body forms, and the big footpath of described right-hand member section moves axially the break-make of described return opening of control and described intermediate cavity along described valve pocket.
Preferably, the big footpath of described right-hand member section is provided with throttling groove near an end of described intermediate cavity, and the cross-section area of described throttling groove is successively decreasing on the direction of described right chamber.
Preferably, the number of described throttling groove is more than two, and described throttling groove circumferentially uniform along the big footpath of described right-hand member section.
Preferably, described elastic member is a pressure adjusting spring.
Shock resistance valve provided by the present invention has filler opening, return opening and feedback hydraulic fluid port, filler opening is communicated with working connection, the feedback hydraulic fluid port is communicated with the feedback oil circuit, and regulating spool and pressure adjusting spring are set in the valve pocket, when working connection pressure rises sharply, there is pressure difference in the pressure that working connection hydraulic oil acts on regulating spool one side with the pressure that feedback oil circuit hydraulic oil acts on the regulating spool opposite side, when this pressure difference exceeds the setting value of pressure adjusting spring, return opening is opened with the hydraulic fluid port that is communicated with of filler opening, working connection hydraulic oil flows back to fuel tank from return opening, carry out off-load, thereby play shock proof effect.The shock resistance valve directly is communicated with working connection, and response is very fast, can in time the working connection pressure peak be cut down, thus shock resistance in time.
In a kind of embodiment, the structure of regulating spool is divided into the big footpath of left end section, middle part path section and the big footpath of right-hand member section, connecting port by the big footpath of right-hand member section shutoff filler opening and return opening, the regulating spool of this structure is in the process of regulating the connecting port aperture, can move comparatively reposefully, compact more with cooperating of valve body, possess the power strength of surging preferably, thereby can increase the service life.
In another kind of embodiment, the big footpath of right-hand member section is provided with throttling groove near an end of intermediate cavity, throttling groove moves regulating spool to open the process of connecting port to have transition stage, avoids the unexpected unlatching of connecting port to cause the working connection pressure drop, thereby avoids the generation impacted.
For reaching another object of the present invention, the present invention also provides a kind of crane hydraulic system, comprise dynamical element and executive component, described dynamical element to the path of described executive component is provided with the control main valve, it is characterized in that, also be provided with the shock resistance valve, described shock resistance valve is above-mentioned each described shock resistance valve, the filler opening of described shock resistance valve is communicated with the working connection of described dynamical element to described control main valve, and the feedback hydraulic fluid port of described shock resistance valve is communicated with the feedback oil circuit of described control main valve.
Preferably, the feedback oil circuit of described control main valve is provided with the filtering damping.
Crane hydraulic system provided by the present invention has used above-mentioned shock resistance valve, because above-mentioned shock resistance valve has above-mentioned technique effect, the crane hydraulic system with this shock resistance valve also has identical technique effect.
In a kind of concrete mode of execution, in the feedback oil circuit, be provided with the filtering damping, can carry out filtering to unusual crest, eliminate the impact of feedback oil circuit, thus the pressure stability of indirect adjustments and controls system.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of shock resistance valve provided by the present invention;
Fig. 2 is the local enlarged diagram at A position among Fig. 1;
Fig. 3 is for using the hydraulic system schematic representation of shock resistance valve shown in Figure 1;
Fig. 4 is the structural representation of the another kind of embodiment of shock resistance valve provided by the present invention.
Embodiment
A core of the present invention is for providing a kind of shock resistance valve, and the pressure ratio of this shock resistance valve by working connection and feedback oil circuit can play the shock resistance effect, thereby keep the pressure stability of system in time with the surge pressure off-load of system.Another core of the present invention is for providing a kind of crane hydraulic system that comprises above-mentioned shock resistance valve.
In order to make those skilled in the art understand technological scheme of the present invention better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.For the ease of understanding, following embodiment is combined in the shock resistance valve in the whole crane hydraulic system and is described, for crane hydraulic system provided by the present invention, its specific embodiment and beneficial effect are embodied in the lump in the following embodiments, discuss no longer separately.Certainly, this shock resistance valve also goes for other hydraulic system, is not limited to crane hydraulic system.
Please refer to Fig. 1 to Fig. 3, Fig. 1 is the structural representation of a kind of embodiment of shock resistance valve provided by the present invention; Fig. 2 is the local enlarged diagram at A position among Fig. 1; Fig. 3 is for using the crane hydraulic system schematic representation of shock resistance valve shown in Figure 1.
Hydraulic pressure shock resistance valve 1 in this embodiment has oil inlet P, oil return inlet T and feedback hydraulic fluid port LS on its valve body 11.Oil inlet P is communicated with the working connection between dynamical element and the control main valve, and as shown in Figure 2, the oil inlet P of shock resistance valve 1 is communicated with the path between oil hydraulic pump 2 and the commutation main valve 3; Oil return inlet T is communicated with fuel tank; Feedback hydraulic fluid port LS is communicated with the feedback oil circuit of this hydraulic system, the feedback oil circuit is passed to the pressure feedback signal of system the control unit of dynamical element, be generally the discharge capacity control unit of oil hydraulic pump 2, the discharge capacity control unit is adjusted the discharge capacity of oil hydraulic pump 2 according to this feedback signal, adapting to the traffic demand of the main valve 3 that commutates, thus the stable hydraulic system.
Be provided with in the valve pocket of shock resistance valve 1 along valve pocket and move axially to control the regulating spool 12 of oil inlet P and oil return inlet T break-make, valve pocket comprises by regulating spool 12 cuts apart left chamber 131 and the right chamber 132 that forms, be that left chamber 131 and right chamber 132 are not connected, the cross-section area of regulating spool 12 left and right sides end faces equates, oil inlet P is communicated with left chamber 131, on valve body 11, offered oil-feed oil duct 111 among Fig. 1, hydraulic oil enters left chamber 131 from oil-feed oil duct 111, feedback hydraulic fluid port LS is communicated with right chamber 132, can on valve body 11, offer feedback oil duct 112, hydraulic oil self feed back oil duct 112 enters right chamber 132, is provided with elastic member between the axial cavity wall of regulating spool 12 and right chamber 132.As shown in Figure 1, elastic member preferably adopts pressure adjusting spring 14, and regulating spool 12 is sealed the connecting port 15 of oil return inlet T and left chamber 131, the i.e. path of shutoff oil return inlet T and oil inlet P under the reset response of pressure adjusting spring 14.When the discharge capacity of dynamical element is changed from small to big rapidly or from large to small the time, the situation of moment greater than feedback oil circuit pressure can appear in the pressure of working connection, be that working connection pressure rises sharply, produce and impact, at this moment, working connection hydraulic oil acts on the pressure in regulating spool 12 left sides greater than feeding back the pressure that oil circuit hydraulic oil acts on regulating spool 12 right sides, the elastic force that the pressure reduction of the two can overcome pressure adjusting spring 14 moves to right regulating spool 12, then the connecting port 15 of oil return inlet T and left chamber 131 will be opened gradually, oil inlet P is communicated with oil return inlet T, and the hydraulic oil that oil inlet P enters left chamber 131 can flow back to fuel tank from oil return inlet T.As shown in the above, the distance that regulating spool 12 moves to right is directly proportional with the size of spring force, and the distance that regulating spool 12 moves to right has determined the size of connecting port 15 apertures, therefore, the pressure difference that overcomes spring force is corresponding with the aperture size of connecting port 15, the corresponding again certain hydraulic fluid flow rate of the aperture of connecting port 15, increase along with flow, the pressure of working connection can correspondingly reduce, when working connection pressure is reduced to a certain degree, flow is metastable value, at this moment, pressure difference and flow can reach the state of a transient equiliblium, and the aperture of shock resistance valve 1 (aperture of connecting port 15) is one to stablize aperture, i.e. pressure difference, flow, connecting port 15 aperture threes are in the state of a transient equiliblium.
Design by regulating spool 12, can obtain the different pressure differences and the characteristic curve of flow, promptly by designing the structure of regulating spool 12, can change regulating spool 12 move to right the distance and connecting port 15 apertures between corresponding relation, the characteristic curve of pressure difference and flow can be realized the adjustable of shock resistance response time.Too short meeting of response time causes the reduction suddenly of working connection pressure, and the response time longly can't realize shock resistance timely and effectively, can reasonably design regulating spool 12 according to actual needs, the control response time.The setting of pressure adjusting spring 14 makes working connection pressure not exceed system pressure and spring force sum, then by regulating pressure adjusting spring 14, the crest size that can regulate the 1 required filtering of shock resistance valve.
Need to prove, the cross-section area of regulating spool 12 left ends and right-hand member equates, thereby pressure and the feedback oil circuit pressure with working connection hydraulic oil is converted into pressure difference equivalently, certainly, based on problems such as machining errors, the cross-section area at two ends, the left and right sides also may as benchmark, be convenient to the design of regulating spool 12 and pressure adjusting spring 14 only for about equally.Certainly, when the cross-section area at two ends, the left and right sides does not wait, also can realize purpose of the present invention, in such cases, the ratio of two ends, left and right sides cross-section area and the cracking pressure of shock resistance valve 1 are linear.
Working connection pressure jump or bust all can cause the compression shock of working connection, for ease of understanding the shock resistance process of this shock resistance valve 1, can illustrate from the situation of following two kinds of working connection pressure jumps and bust: when oil hydraulic pump 2 is in the original state of beginning pump oil, working connection pressure and feedback pressure all can be set up, usually working connection pressure can be prior to the foundation of feedback oil circuit pressure, this moment, oil hydraulic pump 2 had the trend that past maximum pump discharge direction is swung, foundation along with feedback oil circuit pressure, under the effect of discharge capacity control unit, the discharge capacity of oil hydraulic pump 2 can adapt to the traffic demand of control main valve automatically, be that oil hydraulic pump 2 has the trend that past float amount direction is swung, yet, because oil hydraulic pump 2 its own inertial, may be timely toward the swing of float amount direction, be converted in the response time of little discharge capacity in oil hydraulic pump 2 arrogant discharge capacities, can set up elevated pressures at working connection, even be provided with relief valve, pressure also still has part and rises, produce overshoot, then the pressure reduction of working connection pressure and feedback oil circuit pressure can be opened shock resistance valve 1 (connecting port 15 is opened), shock resistance valve 1 carries out off-load in time with this impact, reduce working connection pressure, overshoot is cut down, play shock proof effect; When load does not need hydraulic oil, when the control main valve is closed, working connection between oil hydraulic pump 2 and the control main valve is cut off at control main valve place, the whole cavity volume of oil hydraulic pump 2 is closed, require oil hydraulic pump 2 to stop pump oil, the discharge capacity control unit is by the work of the pressure loss stop solution press pump 2 of perceptible feedback oil circuit, and the transmission of feedback oil circuit, the response of discharge capacity control unit and oil hydraulic pump 2 all needs the regular hour, at this moment the section in, oil hydraulic pump 2 is still worked, and causes the working connection between oil hydraulic pump 2 and the control main valve to produce tangible soaring pressure, feedback oil circuit pressure loss, this pressure difference is opened shock resistance valve 1, carries out off-load shock resistance in time.
By foregoing as can be known, the shock resistance valve 1 in this embodiment directly is communicated with working connection, and response is very fast, can in time the working connection pressure peak be cut down, thus shock resistance in time; In addition, in conjunction with the anti-impact device of feedback oil circuit, the time lag that the shock resistance of feedback oil circuit can be brought, the anti-impact device by working connection remedied, and played stable in advance effect.The anti-impact device of feedback oil circuit can be filtering damping as shown in Figure 2, cuts down unusual crest, stable system, also can in the feedback oil circuit, parts such as pressure compensator or duplex one-way throttle valve be set, regulate the balance of feedback oil circuit pressure, and then regulate indirectly, keep the stable of system.
Regulating spool 12 in this embodiment has the big footpath of left end section 121, middle part path section 122 and the big footpath of right-hand member section 123, the big footpath of left end section 121 and the big footpath of right-hand member section 123 opposing end faces areas equate, the left and right sides face area that is integrally-regulated spool 12 equates, in foregoing, discuss, can guarantee that left chamber 131 and right chamber 132 pressure differences can pass regulating spool 12 its cause is existing; Middle part path section 122 forms intermediate cavity 133 with valve body 11, oil inlet P also is communicated with this intermediate cavity 133, the big footpath of the right-hand member of regulating spool 12 section 123 is sealed connecting port 15, during design, the face area of the big footpath of left end section 121 and the big footpath of right-hand member section 123 relative intermediate cavity 133 is equated, then the hydraulic oil of intermediate cavity 133 applies equal left and right sides active force to regulating spool 12, balance to regulating spool 12 does not have influence, the pressure difference that still relies on left chamber 131 and right chamber 132 that moves of regulating spool 12 realizes, be convenient to integrally-built design, regulating spool 12 is when integral body moves to right vertically, and connecting port 15 is opened.The regulating spool 12 of this structure is compact more with cooperating of valve body 11, has the stronger power of surging strength.
Further, can be provided with throttling groove 1231 at an end of the big footpath of right-hand member section 123 close intermediate cavity 133 shutoff connecting ports 15, throttling groove 1231 is a variable-diameter structure, the cross-section area that is throttling groove 1231 is along successively decreasing towards the direction of right chamber 132, as shown in Figure 3, the cross section of throttling groove 1231 is a triangle, promptly process wedge slot in this position, when the big footpath of right-hand member section 123 moves to right, when opening connecting port 15, hydraulic oil is from the oil return inlet T draining, under the effect of throttling groove 1231, draining flow through connecting port 15 can increase progressively lenitively, then there is the buffer stage of transition in the draining process, and when avoiding the working connection pressure jump, shock resistance valve 1 is opened suddenly, cause the rapid drawdown of working connection pressure again, form certain impact.
Please refer to Fig. 4, Fig. 4 is the structural representation of the another kind of embodiment of shock resistance valve provided by the present invention.
The structure of shock resistance valve 1 is comparatively simplified among this embodiment, roughly the same with the working principle of the foregoing description, have oil inlet P, oil return inlet T and feedback hydraulic fluid port LS on the valve body 11, regulating spool 12 is divided into valve pocket left chamber 131 and right chamber 132 equally, difference is, this shock resistance valve 1 direct left part shutoff connecting port 15 by regulating spool 12, when working connection pressure is higher, equally also can realize the purpose of off-load, yet, this structure is than the foregoing description, and the intensity of its regulating spool 12 and the validity of adjusting are taken second place.
More than a kind of crane hydraulic system provided by the present invention and shock resistance valve thereof are described in detail.Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (7)
1. a shock resistance valve is characterized in that, has filler opening (P), return opening (T) and feedback hydraulic fluid port (LS) on its valve body (11); Be provided with in its valve pocket along described valve pocket and move axially to control the regulating spool (12) of described filler opening (P) and described return opening (T) break-make, described valve pocket comprises by described regulating spool (12) cuts apart left chamber (131) and the right chamber (132) that forms, described filler opening (P) is communicated with described left chamber (131), described feedback hydraulic fluid port (LS) is communicated with described right chamber (132), is provided with elastic member between the axial cavity wall of described regulating spool (12) and described right chamber (132).
2. shock resistance valve according to claim 1, it is characterized in that, described regulating spool (12) has the big footpath of left end section (121), middle part path section (122) and the big footpath of right-hand member section (123), described middle part path section (122) is communicated with described filler opening (P) with the intermediate cavity (133) that described valve body (11) forms, and the big footpath of described right-hand member section (123) moves axially the break-make of described return opening of control (T) and described intermediate cavity (133) along described valve pocket.
3. shock resistance valve according to claim 2, it is characterized in that, the big footpath of described right-hand member section (123) is provided with throttling groove (1231) near an end of described intermediate cavity (133), and the cross-section area of described throttling groove (1231) is successively decreasing on the direction of described right chamber (132).
4. shock resistance valve according to claim 3 is characterized in that, the number of described throttling groove (1231) is more than two, and described throttling groove (1231) circumferentially uniform along the big footpath of described right-hand member section (123).
5. according to each described shock resistance valve of claim 1 to 4, it is characterized in that described elastic member is pressure adjusting spring (14).
6. crane hydraulic system, comprise dynamical element and executive component, described dynamical element to the path of described executive component is provided with the control main valve, it is characterized in that, also be provided with the shock resistance valve, described shock resistance valve is each described shock resistance valve of claim 1 to 5, and the filler opening of described shock resistance valve (P) is communicated with the working connection of described dynamical element to described control main valve, and the feedback hydraulic fluid port (LS) of described shock resistance valve is communicated with the feedback oil circuit of described control main valve.
7. crane hydraulic system according to claim 6 is characterized in that, the feedback oil circuit of described control main valve is provided with the filtering damping.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100998298A CN102155450A (en) | 2011-04-20 | 2011-04-20 | Hydraulic system of crane and shock-resistance valve thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100998298A CN102155450A (en) | 2011-04-20 | 2011-04-20 | Hydraulic system of crane and shock-resistance valve thereof |
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| CN102155450A true CN102155450A (en) | 2011-08-17 |
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| CN2011100998298A Pending CN102155450A (en) | 2011-04-20 | 2011-04-20 | Hydraulic system of crane and shock-resistance valve thereof |
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| CN102661298A (en) * | 2012-05-04 | 2012-09-12 | 徐州重型机械有限公司 | Hydraulic valve and crane provided with same |
| CN102734249A (en) * | 2012-07-18 | 2012-10-17 | 严光贤 | Overload valve |
| CN108591177A (en) * | 2018-07-13 | 2018-09-28 | 徐州重型机械有限公司 | Turn round buffer unit, rotary control system and engineering machinery |
| CN109095368A (en) * | 2018-09-12 | 2018-12-28 | 北京起重运输机械设计研究院有限公司 | Brake apparatus and hoisting system |
| CN110410531A (en) * | 2019-07-18 | 2019-11-05 | 圣邦集团有限公司 | A kind of hydraulic multitandem valve |
| CN113606213A (en) * | 2021-08-12 | 2021-11-05 | 浙江苏强格液压股份有限公司 | Compensation valve |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661298A (en) * | 2012-05-04 | 2012-09-12 | 徐州重型机械有限公司 | Hydraulic valve and crane provided with same |
| CN102661298B (en) * | 2012-05-04 | 2016-02-24 | 徐州重型机械有限公司 | A kind of hydrovalve and there is this hydrovalve hoist |
| CN102734249A (en) * | 2012-07-18 | 2012-10-17 | 严光贤 | Overload valve |
| CN102734249B (en) * | 2012-07-18 | 2015-05-20 | 严光贤 | Overload valve |
| CN108591177A (en) * | 2018-07-13 | 2018-09-28 | 徐州重型机械有限公司 | Turn round buffer unit, rotary control system and engineering machinery |
| CN109095368A (en) * | 2018-09-12 | 2018-12-28 | 北京起重运输机械设计研究院有限公司 | Brake apparatus and hoisting system |
| CN109095368B (en) * | 2018-09-12 | 2024-04-02 | 北京起重运输机械设计研究院有限公司 | Braking device and winding system |
| CN110410531A (en) * | 2019-07-18 | 2019-11-05 | 圣邦集团有限公司 | A kind of hydraulic multitandem valve |
| CN113606213A (en) * | 2021-08-12 | 2021-11-05 | 浙江苏强格液压股份有限公司 | Compensation valve |
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Application publication date: 20110817 |