CN105201946A - Multifunctional load pressure control valve of load sensing system - Google Patents
Multifunctional load pressure control valve of load sensing system Download PDFInfo
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- CN105201946A CN105201946A CN201510655963.XA CN201510655963A CN105201946A CN 105201946 A CN105201946 A CN 105201946A CN 201510655963 A CN201510655963 A CN 201510655963A CN 105201946 A CN105201946 A CN 105201946A
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Abstract
The invention discloses a multifunctional load pressure control valve of a load sensing system. The multifunctional load pressure control valve comprises an oil inlet LS1, an oil outlet LS2 and an oil drain hole L. The oil inlet LS1 is connected with a filter. The other end of the filter is connected with a one-way filtering valve and a flow-fixed valve. The other end of the one-way filtering valve is connected to the oil outlet LS2. The other end of the flow-fixed valve is connected to the oil inlet L. The two ends of the flow-fixed valve are connected with an electric proportional overflow valve in parallel. The multifunctional load pressure control valve is simple and reliable in structure and convenient to install and maintain; by installing the multifunctional load pressure control valve between a load sensing multi-way valve and a variable main pump, the safe reliability and response stability of the load sensing hydraulic system are improved, the application range of the load sensing system is widened, and the safety of a main machine is improved.
Description
Technical field
The present invention relates to a kind of valve assembly of hydraulic pressure installation, relate in particular to a kind of load sensing hydraulic system Multifunctional load stimulation pressure controlled valve.
Background technique
In modern project machinery hydraulic system, for energy-saving and cost-reducing consideration, widely apply load sensing hydraulic system, and more and more higher to the safety reliability of the response of system, stability requirement.Be the key factor of influential system safety reliability, stability to the control of the load feedback pressure of load sensing multi-way valve pickup, directly affect the performance of complete machine.There are the following problems for existing Load sensing system: (1), feedback pipe between load sensing multi-way valve and variable main pump do not have filtrating equipment, the pollutant (machining iron filings, particle etc.) that may remain of working connection inside often can damage the servo variable mechanism of variable main pump; (2), lack in a non-operative state, No Load Start protection motor, can prevent again the function of the executive component misoperation caused because of artificial incorrect operation; (3) although, load sensing multi-way valve can be implemented in feedback pressure off-load under off working state, but generally take valve inner feedback pressure mouth to lead directly to the mode of main return opening, off-load is too fast, the stability of variation main pump swash plate response, and then the stability of influential system; (4), install tubular type one-way throttle valve additional carry out filtering between load sensing multi-way valve and variable main pump, filter effect is poor, and easy response lag.This situation can cause main frame normally to work, and may cause larger security incident time serious.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of load sensing hydraulic system Multi-function pressure control valve.
The present invention is achieved through the following technical solutions: a kind of Load sensing system Multifunctional load stimulation pressure controlled valve, comprises filler opening LS1, oil outlet LS2 and drain tap L; Described filler opening LS1 is connected with filter; The described filter the other end is connected to unidirectional filtering valve and constant flow rate valve, and the unidirectional filtering valve the other end is connected to oil outlet LS2, and the constant flow rate valve the other end is connected to filler opening L; Described constant flow rate valve two ends are parallel with an electric proportional pressure control valve.
It is further: described constant flow rate valve two ends are also parallel with a solenoid directional control valve.
Described Load sensing system Multifunctional load stimulation pressure controlled valve also comprises valve body; Filler opening LS1 and oil outlet LS2 is offered at described valve body two ends respectively, offers feedback pressure feedback working connection between filler opening LS1 and oil outlet LS2; In described filler opening LS1, described filter is installed, in described oil outlet LS2, described unidirectional filtering valve is installed; Described feedback pressure feedback working connection side offers feeds back the branch oil circuit I and branch oil circuit II that working connection is communicated with respectively with feedback pressure; The other end of described branch oil circuit I offers electric proportional pressure control valve mounting hole, installs electric proportional pressure control valve in electric proportional pressure control valve mounting hole; The other end of described branch oil circuit II offers constant flow rate valve mounting hole, installs constant flow rate valve in constant flow rate valve mounting hole; Vent line is offered between described constant flow rate valve mounting hole and drain tap L; Offer between described electric proportional pressure control valve mounting hole and vent line and leak technique working connection.
Described filter comprises joint and is fixed on the filter screen on joint; Described joint is fixed in valve body filler opening LS1 near feedback pressure feedback working connection port position.
Described filter screen is circular filter net; Described joint cylindrical is step type secondary cylindrical body, and endoporus has the groove and through hole that coordinate with filter screen; Described filter screen riveting is in joint.
Described unidirectional filtering valve comprises the valve seat be fixed in oil outlet LS2; Be provided with cone valve in described valve seat, valve seat outer end is provided with damping screw I; Described cone valve inside is provided with damping screw II, is provided with spring I between bottom cone valve rear end and oil outlet LS2; Seal ring I is provided with between bottom described valve seat interior edge face and oil outlet LS2.
Described oil outlet LS2 has internal thread; Described valve seat cylindrical has outside thread and chamfering, and outer one section of valve seat endoporus has internal thread, and valve seat the inner has stepped counterbore, and valve seat interior edge face has a circle deep gouge; One end of described cone valve cylindrical and valve seat inner hole is cone, one end bottom oil outlet LS2 is cylindrical body, have annular pass between cone valve surrounding and valve seat endoporus, the middle part of cone valve endoporus has one section of internal thread, and cone valve one end bottom oil outlet LS2 has stepped counterbore; There is damping hole at described damping screw I center, and cylindrical has outside thread, and damping screw I is threaded connection and is fixed on valve seat endoporus; There is damping hole at described damping screw II center, and cylindrical has outside thread, and damping screw II is threaded connection the middle part being fixed on cone valve endoporus; Described spring I one end is arranged in cone valve stepped counterbore, and the other end is against bottom oil outlet LS2; Described seal ring I is arranged in the deep gouge on valve seat interior edge face.
Described constant flow rate valve comprises the damping screw III be arranged on successively from inside to outside in constant flow rate valve mounting hole, flow setting type spool, spring II, spring seat and adjustment seat; Described spring seat and constant flow rate valve mounting hole are slidably matched, and are provided with seal ring II between spring seat surrounding and constant flow rate valve mounting hole inwall; Described adjustment seat is fixed on constant flow rate valve mounting hole outer end, and adjustment seat center has tapped hole, is provided with adjusting screw in adjustment seat tapped hole; Described adjusting screw the inner is against spring seat outer end, and adjusting screw outer end is provided with set screw nut.
The described constant flow rate valve mandrel heart has axial hole, and axial hole is communicated with flow setting type spool oil inlet end and spring terminal; Flow setting type spool cylindrical has the balancing slit and valve port control flume that reduce hydraulic card clamping force; Flow setting type spool also has the aperture of radial equipartition, aperture one end is communicated with flow setting type spool oil inlet end, and the other end is communicated with the valve port control flume of flow setting type spool cylindrical, and is communicated with the vent line of valve body by valve port control flume; Constant flow rate valve core axial hole the inner has internal thread, and there is damping hole at damping screw III center, and cylindrical has outside thread, and damping screw III is fixed on flow setting type spool near branch oil circuit II port position.
The standard piece that can be directly installed on valve body for the described electric proportional pressure control valve of regulating load feedback pressure and solenoid directional control valve.
Meaning of the present invention is, it is more and more higher to the safety reliability of the response of system, stability requirement that modern project machinery (hoist, pump truck etc.) closes core load sensing hydraulic system.The present invention can: the safety reliability of (1), elevator system: 1. by filter, the load sensing pressure oil that load sensing hydraulic system multi-way valve picks up is filtered, preventing pollution thing damages the servo variable mechanism of variable main pump; 2. can be controlled the load feedback pressure of load sensing hydraulic system by electric proportional pressure control valve (or solenoid directional control valve), motor can be realized in a non-operative state, No Load Start protection motor, can prevent again the executive component misoperation caused because of artificial incorrect operation; 3., under can realizing load sensing hydraulic system off working state by constant flow rate valve, the automatic deloading of load feedback pressure, avoids load sensing main pump still pressure oil output, causes system to build the pressure; (2) by unidirectional filtering valve and constant flow rate valve composition hydraulic pressure by-pass throttle filtering system, filtering and voltage stabilizing are carried out to the load sensing pressure of lotus sensing hydraulic system multi-way valve pickup, the stability of guaranteed load sensed system response.
The present invention is simple and reliable for structure, I&M is convenient; By installing this valve between load sensing multi-way valve and variable main pump, improving the safety reliability of load sensing hydraulic system and the stability of response, having widened the application area of Load sensing system, having improved the Security of main frame.
Accompanying drawing explanation
Fig. 1 is hydraulic schematic diagram of the present invention;
Fig. 2 is structural representation of the present invention;
Fig. 3 is left view in Fig. 2;
Fig. 4 is A-A direction view in Fig. 3;
Fig. 5 is the enlarged view at I place in Fig. 4;
Fig. 6 is the enlarged view at II place in Fig. 4;
Fig. 7 is the enlarged view at III place in Fig. 4;
Fig. 8 is the hydraulic schematic diagram of the present invention when applying in load sensing hydraulic system.
In figure: 1, unidirectional filtering valve; 2, filter; 3, constant flow rate valve; 4, electric proportional pressure control valve; 5, solenoid directional control valve.6, filter screen; 7, joint; 8, filler opening LS1; 9, feedback pressure feedback working connection; 10, branch's oil circuit I; 11, branch's oil circuit II; 12, oil outlet LS2; 13, vent line; 14, drain tap L; 15, valve body; 16, technique working connection is leaked; 17, constant flow rate valve mounting hole; 18, electric proportional pressure control valve mounting hole; 19, the auxiliary oil circuit I of technique is leaked; 20, ball rises plug; 21, the auxiliary oil circuit II of technique is leaked; 22, damping screw III; 23, flow setting type spool; 24, spring II; 25, seal ring II; 26, spring seat; 27, seal ring III; 28, adjustment seat; 29, set screw nut; 30, adjusting screw; 31, electric proportional pressure control valve; 32, damping screw I; 33, valve seat; 34, cone valve; 35, damping screw II; 36, spring I; 37, seal ring I.38, hydraulic jack; 39, load sensing multi-way valve; 40, Multifunctional load stimulation pressure controlled valve; 41, variable main pump.
Embodiment
Be below a specific embodiment of the present invention, existing the invention will be further described by reference to the accompanying drawings.
As shown in Figure 1, a kind of Load sensing system Multifunctional load stimulation pressure controlled valve; Filler opening LS18 is connected with filter 2; Filter 2 the other end is connected to unidirectional filtering valve 1 and constant flow rate valve 3, and unidirectional filtering valve 1 the other end is connected to oil outlet LS212, and constant flow rate valve 3 the other end is connected to filler opening L14; Constant flow rate valve 3 two ends are parallel with an electric proportional pressure control valve 4.Constant flow rate valve 3 two ends are also parallel with a solenoid directional control valve 5, and in actual applications, electric proportional pressure control valve 4 and solenoid directional control valve 5 also only can select one of them.As shown in Figure 8, Load sensing system Multifunctional load stimulation pressure controlled valve 40 is arranged between load sensing multi-way valve 39 and variable main pump 41; When hydraulic jack 38 in running order (stretch out or reclaim), load feedback pressure enters Load sensing system Multifunctional load stimulation pressure controlled valve 40 filler opening LS1 from load sensing multi-way valve 39, then from Load sensing system Multifunctional load stimulation pressure controlled valve 40 oil outlet LS2 to the spring chamber transmission of the servo variable mechanism of variable main pump 41, and then controlled variable main pump is according to the pressure of hydraulic jack and traffic demand fuel feeding.
As shown in Figures 2 to 4, filler opening LS18 and oil outlet LS212 is offered at described valve body 15 two ends respectively, offers feedback pressure feedback working connection 9 between filler opening LS18 and oil outlet LS212; In described filler opening LS18, described filter 2 is installed, in described oil outlet LS212, described unidirectional filtering valve 1 is installed; Described feedback pressure feedback working connection 9 side offers feeds back the branch oil circuit I10 and branch oil circuit II11 that working connection 9 is communicated with respectively with feedback pressure; The other end of described branch oil circuit I10 offers electric proportional pressure control valve mounting hole 18, installs electric proportional pressure control valve 4 in electric proportional pressure control valve mounting hole 18; The other end of described branch oil circuit II11 offers constant flow rate valve mounting hole 17, installs constant flow rate valve 3 in constant flow rate valve mounting hole 17; Vent line 3 is offered between described constant flow rate valve mounting hole 17 and drain tap L14; Offer between described electric proportional pressure control valve mounting hole 18 and vent line 3 and leak technique working connection 16.As shown in Figure 3, leak technique working connection 16 and be communicated with vent line 13 by leaking the auxiliary oil circuit I19 of technique, leak technique working connection 16 and be communicated with electric proportional pressure control valve mounting hole by leaking technique auxiliary oil circuit II21, leak technique working connection 16, leak technique auxiliary oil circuit II21, leak and the auxiliary oil circuit I19 of technique is provided with ball and rises plug 20, the ball plug 20 that rises is standard piece, can be directly installed on valve body (15), for plugging technology oil circuit.
Composition graphs 2 to Fig. 4, and shown in Fig. 5, the filter screen 6 that filter 2 comprises joint 7 and is fixed on joint 7; Described joint 7 is fixed in valve body 15 filler opening LS18 near feedback pressure feedback working connection 9 port position.Filter screen 6 is circular filter nets; Described joint 7 cylindrical is step type secondary cylindrical body, and endoporus has the groove and through hole that coordinate with filter screen 6; Described filter screen 6 riveting is in joint 7.
Composition graphs 2 to Fig. 4, and shown in Fig. 6, unidirectional filtering valve 1 comprises the valve seat 33 be fixed in oil outlet LS212; Be provided with cone valve 34 in described valve seat 33, valve seat 33 outer end is provided with damping screw I32; Described cone valve 34 inside is provided with damping screw II35, is provided with spring I36 between bottom cone valve 34 rear end and oil outlet LS212; Seal ring I37 is provided with between bottom described valve seat 33 interior edge face and oil outlet LS212.Oil outlet LS212 has internal thread; Described valve seat 33 cylindrical has outside thread and chamfering, and outer one section of valve seat 33 endoporus has internal thread, and valve seat 33 the inner has stepped counterbore, and valve seat 33 interior edge face has a circle deep gouge; One end of described cone valve 34 cylindrical and valve seat 33 inner hole is cone, one end bottom oil outlet LS212 is cylindrical body, annular pass is had between cone valve 34 surrounding and valve seat 33 endoporus, the middle part of cone valve 34 endoporus has one section of internal thread, and cone valve 34 one end bottom oil outlet LS212 has stepped counterbore; There is damping hole at described damping screw I32 center, and cylindrical has outside thread, and damping screw I32 is threaded connection and is fixed on valve seat 33 endoporus; There is damping hole at described damping screw II35 center, and cylindrical has outside thread, and damping screw II35 is threaded connection the middle part being fixed on cone valve 34 endoporus; Described spring I36 one end is arranged in cone valve 34 stepped counterbore, and the other end is against bottom oil outlet LS212; Described seal ring I37 is arranged in the deep gouge on valve seat 33 interior edge face.
Composition graphs 2 to Fig. 4, and shown in Fig. 7, constant flow rate valve 3 comprises the damping screw III22 be arranged on successively from inside to outside in constant flow rate valve mounting hole 17, flow setting type spool 23, spring II24, spring seat 26 and adjustment seat 28; Described spring seat 26 is slidably matched with constant flow rate valve mounting hole 17, and spring seat 26 is secondary cylindrical body, and the one-level Excircle machining larger at diameter has seal groove, is provided with seal ring II25 in seal groove; Described adjustment seat 28 is fixed on constant flow rate valve mounting hole 17 outer end, adjustment seat 28 center has tapped hole, in adjustment seat 28 tapped hole, adjusting screw 30 is installed, adjustment seat is provided with radial flange, flange and valve body fitting surface are processed with seal groove, and seal ring III27 is arranged in the flange face sealing groove of adjustment seat 28; Described adjusting screw 30 the inner is against spring seat 26 outer end, and adjusting screw 30 outer end is provided with set screw nut 29, and adjustment seat 28 set screw nut 29, adjusting screw 30 form the decrement of controlling device Regulation spring II24.Flow setting type spool 23 axle center has axial hole, and axial hole is communicated with flow setting type spool 23 oil inlet end and spring terminal; Flow setting type spool 23 cylindrical has the balancing slit and valve port control flume that reduce hydraulic card clamping force; Flow setting type spool 23 also has the aperture of radial equipartition, aperture one end is communicated with flow setting type spool 23 oil inlet end, and the other end is communicated with the valve port control flume of flow setting type spool 23 cylindrical, and is communicated with the vent line 3 of valve body 15 by valve port control flume; Flow setting type spool 23 axial hole the inner has internal thread, and there is damping hole at damping screw III22 center, and cylindrical has outside thread, and damping screw III22 is fixed on flow setting type spool 23 near branch oil circuit II11 port position.
To be directly installed on the standard piece on valve body 15 for the electric proportional pressure control valve 4 of regulating load feedback pressure and solenoid directional control valve 5.
Shown in composition graphs 8, load feedback pressure then by filter 2, then separates 3 tunnels by feedback pressure feedback working connection 9 through filler opening LS1; 1 tunnel, by unidirectional filtering valve 1, is then communicated with the spring chamber of the servo variable mechanism of variable main pump 41 by oil outlet LS2; 1 tunnel, by constant flow rate valve 3, is then communicated with drain tap L, towards hydraulic oil container by vent line 13; 1 tunnel, by electric proportional pressure control valve 4 [or solenoid directional control valve 5], then by leaking technique auxiliary oil circuit II21, leaking technique working connection 16, leaking the auxiliary oil circuit I19 of technique, is communicated with drain tap L, towards hydraulic oil container.
Function one (is filtered the load sensing pressure oil that load sensing hydraulic system multi-way valve picks up by filter, preventing pollution thing damages the servo variable mechanism of variable main pump) mode of execution: when load pressure feedback fluid flows from filler opening LS1 to oil outlet LS2 and drain tap L, the filter screen 6 of filter 2 just can filter the pollutant (machining iron filings, particle etc.) that may remain of working connection inside timely.
Function two [can be controlled the load feedback pressure of load sensing hydraulic system by electric proportional pressure control valve (or solenoid directional control valve), motor can be realized in a non-operative state, No Load Start protection motor, the executive component misoperation caused because of artificial incorrect operation can be prevented again] mode of execution: as mentioned above--1 tunnel is by electric proportional pressure control valve 4 [or solenoid directional control valve 5], then by leaking technique auxiliary oil circuit II21, leaking technique working connection 16, leaking the auxiliary oil circuit I19 of technique, be communicated with drain tap 14, towards hydraulic oil container; Namely load feedback pressure is controlled by electric proportional pressure control valve 4 [or solenoid directional control valve 5], by controller command signal, can realize the artificial of feedback pressure or automatically control off-load or adjustment, thus practical function two.
The mode of execution of function three (under can realizing load sensing hydraulic system off working state by constant flow rate valve, the automatic deloading of load feedback pressure, avoids load sensing main pump still pressure oil output, cause system to build the pressure):
As mentioned above--1 tunnel, by constant flow rate valve 3, is then communicated with drain tap L, towards hydraulic oil container by vent line 13; Namely when hydraulic jack 38 is in off working state, load feedback pressure oil from the endoporus 23 of the damping screw III22 of constant flow rate valve 3, flow setting type spool, be then communicated with drain tap 14 by vent line 13, towards hydraulic oil container, practical function three;
Function four is (by unidirectional filtering valve 1 and constant flow rate valve composition hydraulic pressure by-pass throttle filtering system, filtering and voltage stabilizing are carried out to the load sensing pressure of lotus sensing hydraulic system multi-way valve pickup, guaranteed load sensed system response stability) mode of execution: when load pressure feedback fluid is flowed by unidirectional filtering valve 1, oil outlet LS2 to variable main pump 41 and transmits load feedback pressure, fluid is communicated with hydraulic oil container by constant flow rate valve 3 simultaneously; The pressure surge of load feedback pressure oil is while being filtered (peak of pressure surge and low ebb) by 2 damping holes of the damping screw II35 of unidirectional filtering valve 1 and damping screw I32, in addition the load feedback pressure oil liquid of a part of constant flow rate continue the damping screw III22 from constant flow rate valve 3, flow setting type spool 23 endoporus 23, be then communicated with drain tap L by vent line 13, be diverted to hydraulic oil container; Unidirectional filtering valve 1 and constant flow rate valve 3 form hydraulic pressure by-pass throttle filtering system, carry out filtering and voltage stabilizing to load sensing pressure; Constant flow rate shunting mode of execution: when fluid flows from damping screw III, the front and back pressure reduction of the damping hole of damping screw III keeps constant by spring II.According to the pressure reduction-Flow characteristics of damping hole, the damping hole of damping screw III substantially keep constant by flow.
Claims (10)
1. a Load sensing system Multifunctional load stimulation pressure controlled valve, is characterized in that: comprise filler opening LS1(8), oil outlet LS2(12) and drain tap L(14); Described filler opening LS1(8) be connected with filter (2); Described filter (2) the other end is connected to unidirectional filtering valve (1) and constant flow rate valve (3), and unidirectional filtering valve (1) the other end is connected to oil outlet LS2(12), constant flow rate valve (3) the other end is connected to filler opening L(14); Described constant flow rate valve (3) two ends are parallel with an electric proportional pressure control valve (4).
2. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 1, is characterized in that: described constant flow rate valve (3) two ends are also parallel with a solenoid directional control valve (5).
3. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 1, is characterized in that: described Load sensing system Multifunctional load stimulation pressure controlled valve also comprises valve body (15); Filler opening LS1(8 is offered at described valve body (15) two ends respectively) and oil outlet LS2(12), filler opening LS1(8) and oil outlet LS2(12) between offer feedback pressure feedback working connection (9); Described filler opening LS1(8) the described filter of interior installation (2), described oil outlet LS2(12) the described unidirectional filtering valve (1) of interior installation; Described feedback pressure feedback working connection (9) side offers the branch oil circuit I(10 feeding back working connection (9) respectively with feedback pressure and be communicated with) and branch oil circuit II(11); Described branch oil circuit I(10) the other end offer electric proportional pressure control valve mounting hole (18), electric proportional pressure control valve (4) is installed in electric proportional pressure control valve mounting hole (18); Described branch oil circuit II(11) the other end offer constant flow rate valve mounting hole (17), constant flow rate valve (3) is installed in constant flow rate valve mounting hole (17); Described constant flow rate valve mounting hole (17) and drain tap L(14) between offer vent line (3); Offer between described electric proportional pressure control valve mounting hole (18) and vent line (3) and leak technique working connection (16).
4. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 3, is characterized in that: described filter (2) comprises joint (7) and is fixed on the filter screen (6) on joint (7); Described joint (7) is fixed on valve body (15) filler opening LS1(8) near feedback pressure feedback working connection (9) port position.
5. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 4, is characterized in that: described filter screen (6) is circular filter net; Described joint (7) cylindrical is step type secondary cylindrical body, and endoporus has the groove and through hole that coordinate with filter screen (6); Described filter screen (6) riveting is in joint (7).
6. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 4, is characterized in that: described unidirectional filtering valve (1) comprise be fixed on oil outlet LS2(12) in valve seat (33); Be provided with cone valve (34) in described valve seat (33), valve seat (33) outer end is provided with damping screw I(32); Described cone valve (34) inside is provided with damping screw II(35), cone valve (34) rear end and oil outlet LS2(12) bottom between be provided with spring I(36); Described valve seat (33) interior edge face and oil outlet LS2(12) bottom between be provided with seal ring I(37).
7. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 6, is characterized in that: described oil outlet LS2(12) have internal thread; Described valve seat (33) cylindrical has outside thread and chamfering, and outer one section of valve seat (33) endoporus has internal thread, and valve seat (33) the inner has stepped counterbore, and valve seat (33) interior edge face has a circle deep gouge; One end of described cone valve (34) cylindrical and valve seat (33) inner hole is cone, near oil outlet LS2(12) one end of bottom is cylindrical body, annular pass is had between cone valve (34) surrounding and valve seat (33) endoporus, the middle part of cone valve (34) endoporus has one section of internal thread, and cone valve (34) is near oil outlet LS2(12) one end of bottom has stepped counterbore; Described damping screw I(32) there is damping hole at center, cylindrical has outside thread, damping screw I(32) be threaded connection and be fixed on valve seat (33) endoporus; Described damping screw II(35) there is damping hole at center, cylindrical has outside thread, damping screw II(35) be threaded connection the middle part being fixed on cone valve (34) endoporus; Described spring I(36) one end is arranged in cone valve (34) stepped counterbore, the other end is against oil outlet LS2(12) bottom; Described seal ring I(37) be arranged on valve seat (33) interior edge face deep gouge in.
8. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 4, is characterized in that: described constant flow rate valve (3) comprises the damping screw III(22 be arranged on successively from inside to outside in constant flow rate valve mounting hole (17)), flow setting type spool (23), spring II(24), spring seat (26) and adjustment seat (28); Described spring seat (26) and constant flow rate valve mounting hole (17) are slidably matched, and are provided with seal ring II(25 between spring seat (26) surrounding and constant flow rate valve mounting hole (17) inwall); Described adjustment seat (28) is fixed on constant flow rate valve mounting hole (17) outer end, and adjustment seat (28) center has tapped hole, is provided with adjusting screw (30) in adjustment seat (28) tapped hole; Described adjusting screw (30) the inner is against spring seat (26) outer end, and adjusting screw (30) outer end is provided with set screw nut (29).
9. Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 8, is characterized in that: described flow setting type spool (23) axle center has axial hole, and axial hole is communicated with flow setting type spool (23) oil inlet end and spring terminal; Flow setting type spool (23) cylindrical has the balancing slit and valve port control flume that reduce hydraulic card clamping force; Flow setting type spool (23) also has the aperture of radial equipartition, aperture one end is communicated with flow setting type spool (23) oil inlet end, the other end is communicated with the valve port control flume of flow setting type spool (23) cylindrical, and is communicated with the vent line (3) of valve body (15) by valve port control flume; Flow setting type spool (23) axial hole the inner has internal thread, damping screw III(22) there is damping hole at center, cylindrical has outside thread, damping screw III(22) be fixed on flow setting type spool (23) near branch oil circuit II(11) port position.
10. a kind of Load sensing system Multifunctional load stimulation pressure controlled valve according to claim 2, is characterized in that: be to be directly installed on the standard piece on valve body (15) for the described electric proportional pressure control valve (4) of regulating load feedback pressure and solenoid directional control valve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510655963.XA CN105201946B (en) | 2015-10-13 | 2015-10-13 | Load sensing system Multifunctional load stimulation pressure-control valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510655963.XA CN105201946B (en) | 2015-10-13 | 2015-10-13 | Load sensing system Multifunctional load stimulation pressure-control valve |
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| CN105201946A true CN105201946A (en) | 2015-12-30 |
| CN105201946B CN105201946B (en) | 2017-06-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894925A (en) * | 2020-07-07 | 2020-11-06 | 南京中船绿洲机器有限公司 | Hydraulic integrated control safety valve group for anchor twisting equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107989840B (en) * | 2017-11-23 | 2020-08-04 | 台州市路桥区嘉伟鞋帽厂 | Damping control valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101725589B (en) * | 2009-11-11 | 2013-07-17 | 北京市三一重机有限公司 | Hydraulic system and rotary drilling rig comprising same |
| CN101748969B (en) * | 2009-12-23 | 2012-11-14 | 三一重型装备有限公司 | Hydraulic control loop used for jackdrill and control system thereof |
| CN102588357B (en) * | 2011-12-20 | 2014-08-13 | 徐州重型机械有限公司 | Load sensitive hydraulic system and crane with hydraulic system |
| CN102747949B (en) * | 2012-07-19 | 2014-06-11 | 山河智能装备股份有限公司 | Fast propulsion hydraulic control loop of down-the-hole drill rig |
| CN103671336B (en) * | 2013-12-12 | 2016-03-30 | 中联重科股份有限公司 | Load-sensitive hydraulic system and power matching control method, device and system |
| CN104047917B (en) * | 2014-06-23 | 2016-08-24 | 柳州柳工液压件有限公司 | Flow distributor for construction machinery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894925A (en) * | 2020-07-07 | 2020-11-06 | 南京中船绿洲机器有限公司 | Hydraulic integrated control safety valve group for anchor twisting equipment |
| CN111894925B (en) * | 2020-07-07 | 2022-05-10 | 南京中船绿洲机器有限公司 | Hydraulic integrated control safety valve group for anchor twisting equipment |
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