CN204003710U - A kind of load sensing multi-way valve for variable system - Google Patents

A kind of load sensing multi-way valve for variable system Download PDF

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Publication number
CN204003710U
CN204003710U CN201420359858.2U CN201420359858U CN204003710U CN 204003710 U CN204003710 U CN 204003710U CN 201420359858 U CN201420359858 U CN 201420359858U CN 204003710 U CN204003710 U CN 204003710U
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valve
oil
oil duct
valve block
way valve
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CN201420359858.2U
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张辉
王军
王奔
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ZHEJIANG HAIHONG HYDRAULIC TECHNOLOGY Co Ltd
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ZHEJIANG HAIHONG HYDRAULIC TECHNOLOGY Co Ltd
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Abstract

For a load sensing multi-way valve for variable system, belong to hydraulic components of construction machinery technical field.It comprises valve body, sets gradually oil-feed valve block, descending valve plate, inclination valve block, accessory valve block and oil return valve block in valve body, is provided with priority spool, overload relief valve and DLS relief valve in oil-feed valve block; Oil return valve block is provided with throttle valve and CF overload valve; Valve rod, compensating spool, the second one-way valve, overload oil compensating valve are set respectively in descending valve plate, inclination valve block and accessory valve block, in valve body, are provided with hydraulic fluid port and oil duct.The utlity model has good flow control performance, make the speed of actuator and load irrelevant; The output flow of multi-way valve and its spool stroke match; there is good fretting performance; when manipulation, there is good flow control performance; actuator's speed and induced pressure are irrelevant; when multiple actuators composite moves; flow is independent of each other, and has the functions such as flow control, pressure compensation, repairing automatically, safety protection.

Description

A kind of load sensing multi-way valve for variable system
Technical field
The invention belongs to hydraulic components of construction machinery technical field, be specifically related to a kind of load sensing multi-way valve for variable system that is applied to the variable systems such as fork truck and integrated pressure compensation.
Background technique
Multi-way valve is the core parts in hydraulic system, is used for operating and controlling the motion at mechanical each position, has influence on every technical performance of machinery.Now widely used hydraulic system is in the majority with quantitative system, the multi-way valve using belongs to traditional Kai center throttle valve, its control starting point is relevant with the variation of load with speed adjustable range, in the time that two and above mechanism work simultaneously, existence influences each other, and the mechanism speed with higher load may diminish even motionless.The fine motion characteristic of multi-way valve is poor, and output flow cannot form and mate with the stroke variation of valve rod, and operating characteristics is not good enough.In spool, logical throttling road can cause power loss, and especially in the time of high pressure cutting condition, power loss is larger.Can bring thus the relevant issues of actuator's working stability, reliability and harmony.
Summary of the invention
For the above-mentioned problems in the prior art, the object of the invention is to avoid above-mentioned the deficiencies in the prior art part, a kind of load sensing multi-way valve for variable system is provided, make it have good flow control performance, make the speed of actuator and load irrelevant, in the time that two and above actuator move, be independent of each other simultaneously, even in flow saturation state, the flow that still can make each mechanism obtain maintains proportionate relationship.The output flow of multi-way valve and its spool stroke match, and have good fretting performance.
Described a kind of load sensing multi-way valve for variable system, comprise valve body, in valve body, set gradually oil-feed valve block, descending valve plate, inclination valve block, accessory valve block and oil return valve block, it is characterized in that being provided with priority spool, overload relief valve and DLS relief valve in described oil-feed valve block, spring is set on priority spool; Described oil return valve block is provided with throttle valve and CF overload valve; Valve rod, compensating spool, the second one-way valve, overload oil compensating valve are set respectively in described descending valve plate, inclination valve block and accessory valve block, in valve body, are provided with hydraulic fluid port and oil duct.
Described a kind of load sensing multi-way valve for variable system, it is characterized in that, in described oil-feed valve block, the first one-way valve and joint are set, hydraulic fluid port P1, hydraulic fluid port P2, the first oil duct, a DLS oil duct, a LS oil duct, an EF oil duct and CF oil duct are also set, described hydraulic fluid port P1, hydraulic fluid port P2 are pump filler opening, described CF oil duct is connected with commutator filler opening, the one EF oil duct communicates with work valve block, the one DLS oil duct is connected with the control mouth of commutator, the one LS oil duct is connected with the feedback port of variable displacement pump, and the first oil duct is safety valve return opening.
Described a kind of load sensing multi-way valve for variable system, is characterized in that described oil return valve block is provided with the 3rd LS oil duct, and the feedback oil of described the 3rd LS oil duct is by throttle valve oil sump tank, and the maximum pressure of the 3rd LS oil duct is by the control of CF overload valve.
Described a kind of load sensing multi-way valve for variable system, is characterized in that the DLS oil duct on described oil-feed valve block communicates with the 3rd LS oil duct on oil return valve block.
Described a kind of load sensing multi-way valve for variable system, it is characterized in that, in described inclination valve block, inclination valve rod is set, compensating spool, the second one-way valve, overload oil compensating valve, described compensating spool is vertical with the second one-way valve to be arranged, the first Returnning spring is set on compensating spool, the second Returnning spring is set on the second one-way valve, in described inclination valve block, the first back oil road is set, the first work oil duct, the second oil duct, the 3rd oil duct, the 2nd EF oil duct, the 2nd LS oil duct, the 4th oil duct, the second work oil duct and the second back oil road, a described LS oil duct, the 2nd LS oil duct and the 3rd LS oil duct communicate.
Described a kind of load sensing multi-way valve for variable system, it is characterized in that arranging in described descending valve plate lifting valve rod, compensating spool, the second one-way valve, overload oil compensating valve, described compensating spool is vertical with the second one-way valve to be arranged, the first Returnning spring is set on compensating spool, the second Returnning spring is set on the second one-way valve.
Described a kind of load sensing multi-way valve for variable system, is characterized in that described accessory valve block is two, is set up in parallel between inclination valve block and oil return valve block.
Described a kind of load sensing multi-way valve for variable system, it is characterized in that arranging in described accessory valve block accessory valve rod, compensating spool, the second one-way valve, overload oil compensating valve, described compensating spool is vertical with the second one-way valve to be arranged, the first Returnning spring is set on compensating spool, the second Returnning spring is set on the second one-way valve.
Described a kind of load sensing multi-way valve for variable system, is characterized in that being equipped with the pressure compensation mechanism being made up of compensating spool and Returnning spring on described descending valve plate, inclination valve block and accessory valve block.
Described a kind of load sensing multi-way valve for variable system, is characterized in that being equipped with in line check valve on described descending valve plate, inclination valve block and accessory valve block, and described in line check valve is made up of the second one-way valve and the second Returnning spring.
By adopting above-mentioned technology, a kind of load sensing multi-way valve for variable system obtaining of the present invention, there is good flow control performance, make speed and the load of actuator irrelevant, in the time that two and above actuator move simultaneously, be independent of each other, even in flow saturation state, the flow that still can make each mechanism obtain maintains proportionate relationship; The output flow of multi-way valve and its spool stroke match; there is good fretting performance; when manipulation, there is good flow control performance; actuator's speed and induced pressure are irrelevant; when multiple actuators composite moves; flow is independent of each other, and has the functions such as flow control, pressure compensation, repairing automatically, safety protection.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is hydraulic principle schematic diagram of the present invention;
Fig. 3 is oiling valve chip architecture schematic diagram of the present invention;
Fig. 4 is the A-A sectional structure schematic diagram of Fig. 3;
Fig. 5 is descending valve plate structural representation of the present invention;
Fig. 6 is inclination valve block meta structural representation of the present invention;
Fig. 7 is inclination valve block commutating structure schematic diagram of the present invention;
Fig. 8 is accessory valve structure schematic diagram of the present invention;
Fig. 9 is scavenger valve chip architecture schematic diagram of the present invention.
In figure: 1-oil-feed valve block, 2-descending valve plate, 3-inclination valve block, 4-accessory valve block, 5-oil return valve block, 6-transships relief valve, 7-DLS relief valve, 8-spring, 9-priority spool, 10-the first oil duct, 11-the one DLS oil duct, 12-the one LS oil duct, 13-the one EF oil duct, 14-CF oil duct, 15-the first one-way valve, 16-joint, 17-compensating spool, 18-the first Returnning spring, 19-the second one-way valve, 20-the second Returnning spring, 21-lifting valve rod, 22-overload oil compensating valve, 23-inclination valve rod, 24-the first back oil road, 25-first oil duct of working, 26-the second oil duct, 27-the 3rd oil duct, 28-the 2nd EF oil duct, 29-the 2nd LS oil duct, 30-the 4th oil duct, 31-second oil duct of working, 32-the second back oil road, 33-accessory valve rod, 34-throttle valve, 35-the 3rd LS oil duct, 36-CF overload valve.
Embodiment
Below in conjunction with Figure of description, the invention will be further described:
As shown in Figure 1, a kind of load sensing multi-way valve for variable system of the present invention, comprise oil-feed valve block 1, oil return valve block 5, descending valve plate 2, inclination valve block 3 and for controlling the accessory valve block 4 of other actions, described accessory valve block 4 is two, be set up in parallel between inclination valve block 3 and oil return valve block 5, descending valve plate 2, on inclination valve block 3 and accessory valve block 4, be equipped with pressure compensation mechanism and in line check valve, described pressure compensation mechanism is made up of compensating spool 17 and Returnning spring 18, described in line check valve is made up of the second one-way valve 19 and the second Returnning spring 20.
As in Figure 2-4, interior priority spool 9, overload relief valve 6, DLS relief valve 7, the first one-way valve 15 and the joint 16 of arranging of described oil-feed valve block 1, arranges spring 8 on priority spool 9; Oil-feed valve block 1 also arranges hydraulic fluid port P1, hydraulic fluid port P2, the first oil duct 10, a DLS oil duct 11, a LS oil duct 12, an EF oil duct 13 and CF oil duct 14, described hydraulic fluid port P1, hydraulic fluid port P2 are pump filler opening, described CF oil duct 14 is connected with commutator filler opening, the one EF oil duct 13 communicates with work valve block, the one DLS oil duct 11 is connected with the control mouth of commutator, the one LS oil duct 12 is connected with the feedback port of variable displacement pump, and the first oil duct 10 is safety valve return opening, and P1, P2 mouth are pump filler opening.
As in Figure 2-4, in the time of hydraulic fluid port P1, hydraulic fluid port P2 oil-feed, hydraulic oil through priority spool 9 priority of supplys to CF oil duct 14.In the time that commutator is not worked, now the pressure of a DLS oil duct 11 is zero, priority spool 9 right-hand member oil-feeds, action of hydraulic force is at priority spool 9 right-hand members, overcome the precompression of spring 8, priority spool 9 is moved to the left, and now hydraulic fluid port P1, hydraulic fluid port P2 are communicated with an EF oil duct 13, and pump carrys out oily going and goes in work system;
In the time that commutator is worked, fluid is opened the first one-way valve 15 and is arrived a LS oil duct 12, then feeds back to variable displacement pump, thereby gives system fuel feeding; Simultaneously the fluid of a DLS oil duct 11 enters commutator through the throttle orifice on joint 16, and build-up pressure regulates priority spool 9, by priority spool 9 toward moving right, thereby make that pump is oily preferentially enters steering cylinder by CF oil duct 14, turn to.Overload relief valve 6 on this oil-feed valve block 1 prevents overload for the protection of system, and DLS relief valve 7 limits DLS oil circuit pressure simultaneously.
As shown in Figure 5, interior lifting valve rod 21, compensating spool 17, the second one-way valve 19, the overload oil compensating valve 22 of arranging of described descending valve plate 2, described compensating spool 17 and the vertical setting of the second one-way valve 19, the first Returnning spring 18 is set on compensating spool 17, the second Returnning spring 20 is set on the second one-way valve 19, and descending valve plate 2 is provided with LS oil duct.
As shown in Fig. 6-7, the interior inclination valve rod 23 that arranges of described inclination valve block 3, compensating spool 17, the second one-way valve 19, overload oil compensating valve 22, described compensating spool 17 and the vertical setting of the second one-way valve 19, the first Returnning spring 18 is set on compensating spool 17, the second Returnning spring 20 is set on the second one-way valve 19, interior first back oil road 24 that arranges of described inclination valve block 3, the first work oil duct 25, the second oil duct 26, the 3rd oil duct 27, the 2nd EF oil duct 28, the 2nd LS oil duct 29, the 4th oil duct 30, the second work oil duct 31 and the second back oil road 32, a described LS oil duct 12, the 2nd LS oil duct 29 and the 3rd LS oil duct 35 communicate.
As shown in Figure 2 and Figure 6, when inclination valve block 3 is in neutral position, the 2nd EF oil duct 28 communicates with the oil outlet of variable displacement pump, the first back oil road 24 in inclination valve block 3, the first work oil duct 25, the second oil duct 26, the 3rd oil duct 27, the 2nd EF oil duct 28, the 2nd LS oil duct 29, the 4th oil duct 30, the second work oil duct 31 and the second back oil road 32 are tilted valve rod 23 and cut off, now, do not select pressure feedback to the two LS oil ducts 29 for pressure compensated compensating spool 17, the 2nd LS oil duct 29 pressure are 0, the pressure that feeds back to pump this time is 0, the delivery pressure of variable displacement pump is the pressure reduction of its setting, export few flow, can be by overload relief valve 6 oil sump tanks on leakage and oil-feed valve block 1.
As shown in Figure 2 and Figure 7, when inclination valve block 3 is in commutation position, fluid enters the 3rd oil duct 27 from the 2nd EF oil duct 28 through the throttling groove inclination valve rod 23, compensating spool 17 is up pushed away simultaneously, now the 4th oil duct 30 communicates with the second work oil duct 31, working hole has load, pressure is delivered to the second one-way valve 19 of oil-feed, be delivered to the 2nd LS oil duct 29 by the aperture of compensating spool 17 and feed back to variable displacement pump, improve variable displacement pump pressure, thereby making fluid open the second one-way valve 19 enters the second work oil duct 31 and arrives oil cylinder, and another work oil duct the first work oil duct 25 now communicate with the first back oil road 24, fluid oil sump tank, move, now, the pressure that feeds back to pump by the 2nd LS oil duct 29 is exactly the pressure of the 3rd oil duct 27, and the pressure of the 2nd EF oil duct 28 is exactly the delivery pressure of variable displacement pump, the pressure reduction that is to say the 2nd EF oil duct 28 and the 3rd oil duct 27 is the pressure reduction at variable displacement pump two ends, be a definite value, this just makes flow and the proportional relation of flow area passed through.So, the flow passing through is only relevant to the opening area of inclination valve rod 23, irrelevant with induced pressure, makes the speed of actuator and stroke obtain relation one to one, can reach the anticipation of operation.
As shown in Figure 8, interior accessory valve rod 33, compensating spool 17, the second one-way valve 19, the overload oil compensating valve 22 of arranging respectively of described accessory valve block 4, described compensating spool 17 and the vertical setting of the second one-way valve 19, on compensating spool 17, arrange on the first Returnning spring 18, the second one-way valves 19 the second Returnning spring 20 is set.
As shown in Figure 9, described oil return valve block 5 is provided with throttle valve 34, CF overload valve 36 and the 3rd LS oil duct 35, and the feedback oil of described the 3rd LS oil duct 35 is by throttle valve 34 oil sump tanks, and the maximum pressure of the 3rd LS oil duct 35 is controlled by CF overload valve 36.
As shown in the figure, in the time that multiple actuators move simultaneously, by the adjusting of each valve block compensating spool 17, only have the fluid of that valve block that induced pressure is the highest can arrive the 2nd LS oil duct 29, and the compensating spool 17 of other valve blocks is all in throttle, between the second oil duct 26 and the 3rd oil duct 27, form a pressure reduction, make the 3rd oil duct 27 pressure be increased to the maximum pressure that whole multi-way valve load produces, compensating spool 17 is in an equilibrium position; Now, the pressure of the oil duct of each work valve block is all the same, therefore the 2nd EF oil duct 28 is all the same with the pressure reduction of the 3rd oil duct 27, thereby the flow passing through is only relevant to the corresponding valve rod opening area of each valve block, even therefore under the undersaturated state of flow, the flow proportional relation of each is still the ratio of opening area, each actuator still can move, the pressure reduction that just now the pressure reduction of the 2nd EF oil duct 28 and the 3rd oil duct 27 is set than variable displacement pump is little, and relative movement velocity will reduce.
As shown in the figure, inclination valve block 3 and accessory valve block 4 are all provided with overload oil compensating valve 22 and the second one-way valve 19, in the time that valve rod commutates, in the time that the 3rd oil duct 27 pressure are greater than the second work oil duct 31, open the second one-way valve 19, pump cause is opened with the second work being connected of oil duct 31 the first 25 of work oil ducts are connected fuel tank with the first back oil road 24, and action starts; As long as the pressure of the second work oil duct 31 is no more than the setting pressure of overload oil compensating valve 22, it is closed; Otherwise it is opened.Pump is next oily connects oil sump tank with the second back oil road 32.If sucker occurs in actuator,, by overload oil compensating valve 22, fluid enters the second work oil duct 31 from the second back oil road 32, then enters actuator.

Claims (10)

1. the load sensing multi-way valve for variable system, comprise valve body, in valve body, set gradually oil-feed valve block (1), descending valve plate (2), inclination valve block (3), accessory valve block (4) and oil return valve block (5), it is characterized in that being provided with priority spool (9), overload relief valve (6) and DLS relief valve (7) in described oil-feed valve block (1), spring (8) is set on priority spool (9); Described oil return valve block (5) is provided with throttle valve (34) and CF overload valve (36); Valve rod, compensating spool (17), the second one-way valve (19), overload oil compensating valve (22) are set respectively in described descending valve plate (2), inclination valve block (3) and accessory valve block (4), in valve body, are provided with hydraulic fluid port and oil duct.
2. a kind of load sensing multi-way valve for variable system according to claim 1, it is characterized in that, in described oil-feed valve block (1), the first one-way valve (15) and joint (16) are set, hydraulic fluid port P1 is also set, hydraulic fluid port P2, the first oil duct (10), the one DLS oil duct (11), the one LS oil duct (12), the one EF oil duct (13) and CF oil duct (14), described hydraulic fluid port P1, hydraulic fluid port P2 is pump filler opening, described CF oil duct (14) is connected with commutator filler opening, the one EF oil duct (13) communicates with work valve block, the one DLS oil duct (11) is connected with the control mouth of commutator, the one LS oil duct (12) is connected with the feedback port of variable displacement pump, the first oil duct (10) is safety valve return opening.
3. a kind of load sensing multi-way valve for variable system according to claim 2, it is characterized in that described oil return valve block (5) is provided with the 3rd LS oil duct (35), the feedback oil of described the 3rd LS oil duct (35) is by throttle valve (34) oil sump tank, and the maximum pressure of the 3rd LS oil duct (35) is controlled by CF overload valve (36).
4. a kind of load sensing multi-way valve for variable system according to claim 3, is characterized in that the DLS oil duct (11) on described oil-feed valve block (1) communicates with the 3rd LS oil duct (35) on oil return valve block (5).
5. a kind of load sensing multi-way valve for variable system according to claim 3, it is characterized in that arranging in described inclination valve block (3) inclination valve rod (23), compensating spool (17), the second one-way valve (19), overload oil compensating valve (22), the setting vertical with the second one-way valve (19) of described compensating spool (17), the first Returnning spring (18) is set on compensating spool (17), the second Returnning spring (20) is set on the second one-way valve (19), in described inclination valve block (3), the first back oil road (24) is set, the first work oil duct (25), the second oil duct (26), the 3rd oil duct (27), the 2nd EF oil duct (28), the 2nd LS oil duct (29), the 4th oil duct (30), the second work oil duct (31) and the second back oil road (32), a described LS oil duct (12), the 2nd LS oil duct (29) and the 3rd LS oil duct (35) communicate.
6. a kind of load sensing multi-way valve for variable system according to claim 1, it is characterized in that arranging in described descending valve plate (2) lifting valve rod (21), compensating spool (17), the second one-way valve (19), overload oil compensating valve (22), the setting vertical with the second one-way valve (19) of described compensating spool (17), the first Returnning spring (18) is set on compensating spool (17), the second Returnning spring (20) is set on the second one-way valve (19).
7. a kind of load sensing multi-way valve for variable system according to claim 1, is characterized in that described accessory valve block (4) is two, is set up in parallel between inclination valve block (3) and oil return valve block (5).
8. a kind of load sensing multi-way valve for variable system according to claim 1, it is characterized in that arranging in described accessory valve block (4) accessory valve rod (33), compensating spool (17), the second one-way valve (19), overload oil compensating valve (22), the setting vertical with the second one-way valve (19) of described compensating spool (17), the first Returnning spring (18) is set on compensating spool (17), the second Returnning spring (20) is set on the second one-way valve (19).
9. a kind of load sensing multi-way valve for variable system according to claim 1, is characterized in that being equipped with on described descending valve plate (2), inclination valve block (3) and accessory valve block (4) pressure compensation mechanism being made up of compensating spool (17) and Returnning spring (18).
10. a kind of load sensing multi-way valve for variable system according to claim 1, it is characterized in that being equipped with in line check valve on described descending valve plate (2), inclination valve block (3) and accessory valve block (4), described in line check valve is made up of the second one-way valve (19) and the second Returnning spring (20).
CN201420359858.2U 2014-07-01 2014-07-01 A kind of load sensing multi-way valve for variable system Active CN204003710U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840571A (en) * 2015-01-16 2016-08-10 徐工集团工程机械股份有限公司 Valve body of load-sensitive multi-way valve reversing link and load-sensitive multi-way valve reversing link
CN108131348A (en) * 2018-02-05 2018-06-08 江苏恒立液压科技有限公司 Load sensing multi-way valve
CN111520368A (en) * 2020-04-21 2020-08-11 中联重科股份有限公司 Flow distribution control method of load sensitive system
CN112524294A (en) * 2020-10-28 2021-03-19 武汉船用机械有限责任公司 Multi-way valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840571A (en) * 2015-01-16 2016-08-10 徐工集团工程机械股份有限公司 Valve body of load-sensitive multi-way valve reversing link and load-sensitive multi-way valve reversing link
CN108131348A (en) * 2018-02-05 2018-06-08 江苏恒立液压科技有限公司 Load sensing multi-way valve
CN111520368A (en) * 2020-04-21 2020-08-11 中联重科股份有限公司 Flow distribution control method of load sensitive system
CN111520368B (en) * 2020-04-21 2022-03-04 中联重科股份有限公司 Flow distribution control method of load sensitive system
CN112524294A (en) * 2020-10-28 2021-03-19 武汉船用机械有限责任公司 Multi-way valve
CN112524294B (en) * 2020-10-28 2022-04-29 武汉船用机械有限责任公司 Multi-way valve

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