CN204493324U - Load sensing multi-way valve and construction machinery hydraulic system - Google Patents

Load sensing multi-way valve and construction machinery hydraulic system Download PDF

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Publication number
CN204493324U
CN204493324U CN201520032890.4U CN201520032890U CN204493324U CN 204493324 U CN204493324 U CN 204493324U CN 201520032890 U CN201520032890 U CN 201520032890U CN 204493324 U CN204493324 U CN 204493324U
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China
Prior art keywords
valve
communicated
oil
pressure
load sensing
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CN201520032890.4U
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Chinese (zh)
Inventor
景军清
孙辉
刘莹莹
翟亚楠
杜璇
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Construction Machinery Branch of XCMG
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Construction Machinery Branch of XCMG
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Abstract

The utility model relates to a kind of load sensing multi-way valve and construction machinery hydraulic system, wherein, load sensing multi-way valve comprises first and tail connection, and one or more commutation the be arranged in parallel between first and tail join joins, also comprise total filler opening, the first return opening and total load feedback hydraulic fluid port; Commutation connection comprises selector valve, commutation connection pressure-compensated valve and commutation connection one-way valve; Commutation connection pressure-compensated valve is communicated with the filler opening of total filler opening and selector valve, and the actuator port of selector valve is communicated with actuator, and the return opening of selector valve is communicated with the first return opening; The load feedback hydraulic fluid port of commutation connection one-way valve connection total load feedback hydraulic fluid port and selector valve, on the oil circuit that commutation connection one-way valve is communicated with the load feedback hydraulic fluid port of selector valve, also side is connected to the first oil circuit being communicated with the spring chamber joining pressure-compensated valve that commutates.The utility model adopts modular design, and internal oil passages is simple, and extensibility is strong.

Description

Load sensing multi-way valve and construction machinery hydraulic system
Technical field
The utility model relates to engineering machinery field, particularly relates to a kind of load sensing multi-way valve and construction machinery hydraulic system.
Background technique
Multiple directional control valve is the core parts of construction machinery hydraulic system, between oil hydraulic pump and executive component, for hydraulic control oil uninterrupted and the flow direction, thus the moving direction of centralized control engineering machinery actuating element and speed.Current load sensitive system utilizes pressure-compensated valve to play balanced load effect usually, make all valve rod inlet outlet pressure differentials equal, ensure by the flow of selector valve only relevant with the opening area of this spool, not by the impact of actuator load size, operator easily controls its composite move by the hope of oneself, keeps the independence of each actuator motions.Wherein, pressure compensated implication is: in load sensitive system, is used for the work connection low to induced pressure to realize compensate function, thus keeps main valve plug two ends pressure reduction constant, thus make work join flow and spool stroke proportional.
Current load sensing multi-way valve is special valve, is divided into metering pump load sensing multi-way valve and variable displacement pump load sensing multi-way valve, and the function requirement design according to engineering machinery main frame becomes special load sensing multi-way valve.Current existing variable displacement pump load sensing multi-way valve is used in the load sensitive system of employing load-reacting pump, and multi-way valve adopts screw thread inserting type main safety valve protective system maximum pressure; When the connection that commutates commutates, the maximum pressure of all commutation connection is selected to feed back to load-reacting pump by shuttle valve.Metering pump load sensitive system is used in the load sensitive system of employing metering pump, and multi-way valve adopts first pressure-compensated valve by flow overflow unnecessary for system to fuel tank; When the connection that commutates commutates, the maximum pressure of all commutation connection is selected to feed back to first pressure-compensated valve by shuttle valve.The pilot control of current load sensing multi-way valve commutation is arranged on the both sides of commutation connection valve body, realizes the control of multi-way valve different direction.
Above-mentioned current load sensing multi-way valve Problems existing is as follows:
1) current load sensing multi-way valve is special valve, and its function is few, and only in specific engineering machinery main computer boxes, extensibility is not strong, as needs change system needs to redesign whole load sensing multi-way valve.
2) current load sensing multi-way valve adopts screw thread inserting type main safety valve, and rated flow is little, cannot meet the load sensing multi-way valve of more rated flow, and the screw thread inserting type relief valve pressure loss is large, and open and shut characteristic is poor.
3) due to when load sensing multi-way valve meta, load-reacting pump work is in minimum swash angle, pump exports a less flow, the Median Function of existing load sensing multi-way valve is for closing center, therefore, load sensitive pump now pressure cannot unload, and build-up of pressure is too high, easily causes engineering machinery easily to stop working when engine start.
4) the current the highest Ls of load sensing multi-way valve (Load Sensing, load-sensitive) pressure signal selection adopt shuttle valve realize, adopt shuttle valve to select Ls signal maximum pressure, make multi-way valve oil duct very complicated, and be not easy to make integral multitandem valve.
5) load sensing multi-way valve Ls pressure surge in commutation process is at present comparatively large, and easily produces impact.
6) load sensing multi-way valve can only be metering pump load sensing multi-way valve or be variable displacement pump load sensing multi-way valve at present, freely can not switch between metering pump load sensing multi-way valve and variable displacement pump load sensing multi-way valve.
7) in current load sensing multi-way valve, the pilot control opening of commutation connection is arranged on valve body both sides, and pipeline is installed and safeguarded inconvenient.
Model utility content
The purpose of this utility model proposes a kind of load sensing multi-way valve and construction machinery hydraulic system, and wherein, load sensing multi-way valve internal oil passages is simple, and extensibility is strong.
For achieving the above object, the utility model provides a kind of load sensing multi-way valve, it comprises first and tail connection, and one or more commutation the be arranged in parallel between described first and described tail join joins, and also comprises total filler opening, the first return opening and total load feedback hydraulic fluid port;
Described commutation connection comprises selector valve, commutation connection pressure-compensated valve and commutation connection one-way valve;
Described commutation connection pressure-compensated valve is communicated with the filler opening of described total filler opening and described selector valve, and the actuator port of described selector valve is communicated with actuator, and the return opening of described selector valve is communicated with described first return opening; Described commutation joins the load feedback hydraulic fluid port that one-way valve is communicated with described total load feedback hydraulic fluid port and described selector valve, and on the oil circuit that described commutation connection one-way valve is communicated with the load feedback hydraulic fluid port of described selector valve, also side is connected to the first oil circuit being communicated with the described spring chamber joining pressure-compensated valve that commutates.
One preferably or in embodiment, described first comprises first pressure-compensated valve and safety valve; The filler opening of described first pressure-compensated valve is communicated with described total filler opening, and the oil outlet of described first pressure-compensated valve is communicated with described first return opening with the oil outlet of described safety valve;
Described total filler opening is also communicated with the spring chamber of described first pressure-compensated valve and the filler opening of described safety valve by the second oil circuit; Described total load feedback hydraulic fluid port is also communicated with the spring chamber of described first pressure-compensated valve and the filler opening of described safety valve by the 3rd oil circuit;
Different according to from the pump that total filler opening is communicated with, selectivity is arranged as follows:
Described second oil circuit arranges the first damping, corresponding, described 3rd oil circuit is arranged stifled;
Or,
Described second oil circuit is arranged stifled, corresponding, described 3rd oil circuit arranges the first damping.
Preferably or in embodiment, described first oil circuit is provided with the second damping one.
Preferably or in embodiment one, be connected to the 4th oil circuit being communicated with described first return opening by the oil circuit that the actuator port of described selector valve is communicated with actuator, described 4th oil circuit arranges screwed plug, unidirectional Fill valve or overload oil compensating valve.
One preferably or in embodiment, described 4th oil circuit arranges unidirectional Fill valve, on the oil circuit that described unidirectional Fill valve is communicated with described first return opening, side is connected to the 5th oil circuit, described 5th oil circuit is communicated with the load feedback oil circuit between described actuator and described selector valve, and described 5th oil circuit is provided with Ls relief valve.
One preferably or in embodiment, described overload oil compensating valve comprises the precursor overflow valve of parallel communication and unidirectional Fill valve, the filler opening of described precursor overflow valve and the oil outlet of described unidirectional Fill valve are communicated with the oil circuit between the actuator port of described selector valve and described actuator, and the oil outlet of described precursor overflow valve is communicated with described first return opening with the filler opening of described unidirectional Fill valve.
One preferably or in embodiment, described commutation joins pressure-compensated valve and comprises reduction valve, and the filler opening of described reduction valve is communicated with described total filler opening, and the oil outlet of described reduction valve is communicated with the filler opening of described selector valve.
One preferably or in embodiment, the oil circuit that the filler opening of described reduction valve is communicated with oil outlet also arranges one-way valve.
One preferably or in embodiment, described first also comprises meta unloading valve, the filler opening of described meta unloading valve is communicated with described total filler opening, the oil outlet of described meta unloading valve is communicated with described first return opening, and spring chamber and the described total load of described meta unloading valve are fed back hydraulic fluid port and be communicated with.
One preferably or in embodiment, described first also comprises dynamic antivibration valve, filler opening and the described total load of described dynamic antivibration valve are fed back hydraulic fluid port and are communicated with, the oil outlet of described dynamic antivibration valve is communicated with described first return opening, feed back on oil circuit that hydraulic fluid port is communicated with in described dynamic antivibration valve and described total load and be provided with the 3rd damping, the spring chamber of described dynamic antivibration valve is communicated with the oil circuit between described 3rd damping and the filler opening of described dynamic antivibration valve, being communicated with described 3rd damping and described total load without spring chamber and feeding back oil circuit between hydraulic fluid port of described dynamic antivibration valve.
One preferably or in embodiment, the oil circuit that the oil outlet of described first pressure-compensated valve is communicated with described first return opening is provided with the first one-way valve, the oil outlet of described first pressure-compensated valve is also communicated with the second return opening, and the oil circuit that the oil outlet of described first pressure-compensated valve is communicated with described second return opening also arranges the second one-way valve; The oil outlet of described safety valve is also communicated with the filler opening of described first one-way valve and the second one-way valve.
One preferably or in embodiment, described tail connection comprises two tails connection one-way valves, the filler opening of two described tail connection one-way valves is communicated with the return opening of each described described selector valve in joining that commutate, and two described tails join the oil outlet connection fuel tank of one-way valves.
One preferably or in embodiment, described selector valve is hand-operated direction valve, electric change valve, pilot operated directional control valve or electric proportional reversing valve.
One preferably or in embodiment, when selector valve is electric proportional reversing valve, also comprise reduction valve in described tail connection, the filler opening of described reduction valve is communicated with total filler opening, and the oil outlet of described reduction valve is communicated with the pilot port of the electric proportional reversing valve in described commutation connection.
One preferably or in embodiment, described first, described commutation connection and described tail connection are integrated valve body structure, described first, described commutation connection and stud is crossed by described tail UNICOM and nut is fixed as one.
One preferably or in embodiment, described commutation connection comprises commutation connection valve body, be provided with selector valve main valve core bore in described commutation connection valve body, be provided with selector valve main valve plug in described selector valve main valve core bore, in described selector valve main valve plug, be provided with internal galleries.
One preferably or in embodiment, the internal galleries arranged in described selector valve main valve plug is communicated with the load feedback groove of described selector valve, and at described internal galleries the oil circuit be communicated with the load feedback groove of described selector valve is provided with filter screen.
One preferably or in embodiment, described commutation connection valve body is provided with guide structure, described guide structure comprises the first end cap, second end cap and the guide's hydraulic fluid port be arranged on described first end cap or described second end cap, described first end cap and described commutation join between valve body and form the first guide oil chamber, described second end cap and described commutation join between valve body and form the second guide oil chamber, described guide's hydraulic fluid port comprises first guide's hydraulic fluid port and second guide's hydraulic fluid port, the hydraulic oil entering described first guide oil chamber by described first guide's hydraulic fluid port or the hydraulic oil entering described second guide oil chamber by described second guide's hydraulic fluid port and the described guide oil passage joined on valve body that commutates can drive the selector valve main valve plug of described selector valve to move in selector valve main valve core bore, realize the conversion of described selector valve working position and meta.
One preferably or in embodiment, described guide structure also comprises and is arranged on spring in described first guide oil chamber and spring seat, wherein one end of described spring and described spring seat deviate from the described part that joins valve body of commutating and to abut against and the elastic force of described spring drives the end of described spring seat and described selector valve main valve plug to abut against, and described spring seat is provided with spring seat close to the position at arris place, described selector valve main valve plug end and leads to oil groove.
One preferably or in embodiment, described selector valve main valve plug is provided with logical oil groove, when described selector valve main valve plug moves, described logical oil groove and described commutation can be made to join to be formed between valve body to allow the gas in the hydraulic oil in described first guide oil chamber or described second guide oil chamber by and the air be communicated with the return opening of described selector valve gets rid of passage.
One preferably or in embodiment, described first end cap or described second end cap are removably connected with stroke adjustment parts, described stroke adjustment parts can be locked in the diverse location place of described first end cap or described second end cap along the movement direction of described selector valve main valve plug, when described selector valve main valve plug moves to left position or right position and described stroke adjustment parts abut against.
For achieving the above object, the utility model additionally provides a kind of construction machinery hydraulic system, and it comprises the load sensing multi-way valve in above-mentioned any embodiment.
Based on technique scheme, the utility model at least has following beneficial effect:
The load sensing multi-way valve that the utility model provides adopts modular design, commutation connection quantity can be determined according to engineering machinery host computer system demand, for system layout is provided convenience, and in commutation connection, adopt one-way valve to replace shuttle valve to select the highest Ls pressure signal of load sensing multi-way valve, simplify multi-way valve oil duct, structurally both can adopt slice structure, more easily adopt monolithic construction again.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
The hydraulic principle schematic diagram of the load sensing multi-way valve that Fig. 1 provides for the utility model;
The valve body structure schematic diagram of the load sensing multi-way valve that Fig. 2 provides for the utility model;
Fig. 3 bears the structural profile schematic diagram of the commutation connection of year sensing multi-way valve provided for the utility model;
Fig. 4 is the close-up schematic view at I place in Fig. 3;
Fig. 5 is the close-up schematic view at II place in Fig. 3.
Attached number in the figure:
1-first pressure-compensated valve; 2-first damping; 3-blocks up; 4-safety valve; 5-first one-way valve; 6-second one-way valve; 7-dynamic antivibration valve; 8-meta unloading valve; 9-first commutates and joins one-way valve; 10-first commutates and joins pressure-compensated valve; 11-hand-operated direction valve; 12-first screwed plug; 13-second screwed plug; 14-second commutates and joins one-way valve; 15-second commutates and joins pressure-compensated valve; 16-pilot operated directional control valve; 17-first overload oil compensating valve; 18-second overload oil compensating valve; 19-the 3rd commutates and joins one-way valve; 20-the 3rd commutates and joins pressure-compensated valve; The electric proportional reversing valve of 21-first; 22-first repairing one-way valve; 23-second repairing one-way valve; 24-the one Ls relief valve; 25-the 2nd Ls relief valve; 26-the 4th commutates and joins one-way valve; 27-the 4th commutates and joins pressure-compensated valve; The electric proportional reversing valve of 28-second; 29-the 3rd screwed plug; 30-the 4th screwed plug; 31-reduction valve; 32-the 3rd one-way valve; 33-the 4th one-way valve;
102a-first commutates connection; 102b-second commutates connection; 102c-the 3rd commutates connection; 102d-the 4th commutates connection;
101-first; 102-commutates connection; 103-tail joins; 104-stud; 105-nut; 106-first guide hydraulic fluid port; 107-second guide hydraulic fluid port;
201-commutation connection valve body; 202-pressure compensation spool; 203-second damping; 204-first end cap; 214-second end cap; 205,215-sealing nut; 206,216-stroke regulating screw; 207,210-spring seat; 208-spring; 209-clamping bolt; 211,212-filter screen; 213-selector valve main valve plug; 217,218-throttling groove; 301,302,303-main valve hole groove;
219-end cap leads to oil groove; 220,221-spool leads to oil groove.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technological scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on embodiment of the present utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore the restriction to the utility model protection domain can not be interpreted as.
As shown in Figure 1, for the illustrative examples of the load sensing multi-way valve that the utility model provides, in this illustrative examples, load sensing multi-way valve comprises first 101, commutation connection 102 and tail connection 103, wherein, commutation connection 102 can arrange one or more, and the magnitude setting of commutation connection 102 can be determined according to the needs of hydraulic system, and several commutation connection 102 is arranged in parallel between first 101 and tail connection 103 (as shown in Figure 2).Load sensing multi-way valve also comprises total oil inlet P, the first oil return inlet T and total load feedback hydraulic fluid port Ls.
The first 101 of the load sensing multi-way valve that the utility model provides at least can comprise first pressure-compensated valve 1 and safety valve 4, can also comprise the first damping 2, stifled 3, first one-way valve 5, second one-way valve 6, dynamic antivibration valve 7 and meta unloading valve 8.
The filler opening of first pressure-compensated valve 1 is communicated with total oil inlet P, and the oil outlet of first pressure-compensated valve 1 is communicated with the first oil return inlet T with the oil outlet of safety valve 4.Total oil inlet P is also communicated with the spring chamber of first pressure-compensated valve 1 and the filler opening of safety valve 4 by the second oil circuit; Total load feedback hydraulic fluid port Ls is also communicated with the spring chamber of first pressure-compensated valve 1 and the filler opening of safety valve 4 by the 3rd oil circuit.
Different according to from the pump that total oil inlet P is communicated with, can selectivity be arranged as follows:
Second oil circuit arranges the first damping 2, and the spring chamber of first pressure-compensated valve 1 is connected with the first damping 2 and safety valve 4 simultaneously; Corresponding, the 3rd oil circuit arranges stifled 3; Be applicable to variable displacement pump load sensitive system.
Or,
Second oil circuit arranges stifled 3, corresponding, the 3rd oil circuit arranges the first damping 2, is applicable to metering pump load sensitive system.
The utility model, by the conversion of damping and stifled position, can change the break-make of oil circuit, realizes freely switching of variable displacement pump load sensing multi-way valve and metering pump load sensing multi-way valve.
In above-mentioned illustrative examples, in the utility model, first pressure-compensated valve 1 is as the main of main safety valve, slide-valve structure can be adopted, safety valve 4 can adopt thread cartridge valve type structure as the pilot stage of main safety valve, meet the demand of the load sensing multi-way valve of more rated flow, and the pressure loss is little, open and shut characteristic is good.When pump is impacted or pressure raises suddenly, the pressure oil of total oil inlet P flows to the lower end of safety valve 4 through the first damping 2, safety valve 4 is opened, be communicated with the first oil return inlet T, make the first damping 2 two ends produce pressure difference, first pressure-compensated valve 1 is opened, pressure oil stream first oil return inlet T of total oil inlet P, reduce the pressure of pumping hole, make hydraulic system recover stable.
One preferably or in embodiment, the oil circuit that the oil outlet of first pressure-compensated valve 1 is communicated with the first oil return inlet T is provided with the first one-way valve 5, the oil outlet of first pressure-compensated valve 1 can also connect the second return opening K, and the oil circuit that the oil outlet of first pressure-compensated valve 1 is communicated with the second return opening K can also arrange the second one-way valve 6.The oil outlet of safety valve 4 also can be communicated with the filler opening of the first one-way valve 5 and the filler opening of the second one-way valve 6.Oil outlet and the oil outlet of the second one-way valve 6 of the first one-way valve 5 are communicated with the first oil return inlet T and the second return opening K respectively.
The utility model is at the first one-way valve 5 and the second one-way valve 6 of integrated two different pressures of the first 101 of load sensing multi-way valve, first one-way valve 5 and the second one-way valve 6 can provide two kinds of different back pressures according to system requirements, when oil liquid temperature height, oil return enters cooler cooling by the one-way valve that pressure set points is low, when oil liquid temperature is low, the high direct oil sump tank of one-way valve of setting value is passed through in oil return, and prevent because oil viscosity is large, flow resistance is large and damage cooler.
In the illustrative examples of the load sensing multi-way valve provided at the utility model, first 101 can also comprise meta unloading valve 8, the filler opening of meta unloading valve 8 is communicated with total oil inlet P, the oil outlet of meta unloading valve 8 is communicated with the second return opening K with the first oil return inlet T, spring chamber and the total load of meta unloading valve 8 are fed back hydraulic fluid port Ls and are communicated with, being communicated with without the filler opening of spring chamber with meta unloading valve 8 of meta unloading valve 8.
The utility model arranges meta unloading valve 8 in the first 101 of load sensing multi-way valve, when load sensing multi-way valve is at meta, Ls (load-sensitive) pressure acting on the spring chamber of meta unloading valve 8 is almost nil, the pressure that the pressure of the total oil inlet P of load-reacting pump overcomes spring makes meta unloading valve 8 open, the flow of load-reacting pump is uninstalled, keep pump to be in low-pressure state, avoid engineering machinery flame-out when engine start.
The first 101 of the load sensing multi-way valve that the utility model provides can also comprise dynamic antivibration valve 7, filler opening and the total load of dynamic antivibration valve 7 are fed back hydraulic fluid port Ls and are communicated with, the oil outlet of dynamic antivibration valve 7 is communicated with the second return opening K with the first oil return inlet T, feed back on oil circuit that hydraulic fluid port Ls is communicated with in dynamic antivibration valve 7 and total load and be provided with the 3rd damping, the spring chamber of dynamic antivibration valve 7 is by the oil circuit between oil circuit connection the 3rd damping and the filler opening of dynamic antivibration valve 7, being communicated with the 3rd damping and total load without spring chamber by oil circuit and feeding back oil circuit between hydraulic fluid port Ls of dynamic antivibration valve 7.
The commutation connection 102 of the load sensing multi-way valve that the utility model provides at least can comprise selector valve, commutation connection pressure-compensated valve and commutation connection one-way valve.The filler opening of commutation connection pressure-compensated valve is communicated with total oil inlet P, and the oil outlet of commutation connection pressure-compensated valve is communicated with the filler opening of selector valve, and the actuator port of selector valve is communicated with actuator, and the return opening of selector valve is communicated with the first oil return inlet T and the second return opening K; The load feedback hydraulic fluid port of selector valve is communicated with the filler opening of commutation connection one-way valve and the spring chamber of commutation connection pressure-compensated valve side by side, and the oil outlet of commutation connection one-way valve is communicated with total load feedback hydraulic fluid port Ls; Be communicated with by arranging the first oil circuit between the spring chamber that the load feedback hydraulic fluid port of selector valve and commutation join pressure-compensated valve, the first oil circuit is provided with the second damping 203 (as shown in Figure 3).
On the oil circuit that the actuator port of selector valve is communicated with actuator, other the 4th oil circuit being connected to connection first oil return inlet T and the second return opening K, the 4th oil circuit can be arranged screwed plug, unidirectional Fill valve or overload oil compensating valve.4th oil circuit arranges unidirectional Fill valve, on the oil circuit that unidirectional Fill valve and the first oil return inlet T are communicated with the second return opening K, side is connected to the 5th oil circuit, 5th oil circuit is communicated with the load feedback oil circuit between actuator and selector valve, and the 5th oil circuit can be provided with Ls relief valve.
Overload oil compensating valve in above-described embodiment can comprise the precursor overflow valve of parallel communication and unidirectional Fill valve, the filler opening of precursor overflow valve and the oil outlet of unidirectional Fill valve are communicated with the oil circuit between the actuator port of selector valve and actuator, and the oil outlet of precursor overflow valve is communicated with the first oil return inlet T and the second return opening K with the filler opening of unidirectional Fill valve.
Commutation connection pressure-compensated valve in above-described embodiment can be reduction valve, and the filler opening of reduction valve is communicated with total oil inlet P, and the oil outlet of reduction valve is communicated with the filler opening of selector valve.The oil circuit that the filler opening of reduction valve is communicated with oil outlet can also arrange one-way valve, and after arranging one-way valve, commutation connection pressure-compensated valve is that load keeps pressure-compensated valve.
The commutation connection of the load sensing multi-way valve that the utility model provides can comprise four commutation connection, be followed successively by the first commutation connection, the second commutation connection, the 3rd commutation connection and the 4th commutation connection, wherein, selector valve in first commutation connection can be hand-operated direction valve, selector valve in second commutation connection can be pilot operated directional control valve, and the 3rd commutation connection and the 4th selector valve commutated in connection can be all electric proportional reversing valve.
For four shown in Fig. 1 commutation connection, the utility model is described in detail below, actual when arranging, be not limited to arrange four commutation connection.
First commutation connection 102a can comprise the first commutation connection one-way valve 9 (commutation connection one-way valve), the first commutation connection pressure-compensated valve 10, hand-operated direction valve 11, first screwed plug 12 and the second screwed plug 13.The oil outlet of the first commutation connection pressure-compensated valve 10 is communicated with the filler opening of hand-operated direction valve 11, and first commutates joins the commutate load feedback hydraulic fluid port of the filler opening that joins one-way valve 9 and hand-operated direction valve 11 of the spring chamber and first of pressure-compensated valve 10 and be connected; The return opening of hand-operated direction valve 11 is communicated with the second one-way valve 6 with the first one-way valve 5 in first.All other the 4th oil circuit being connected to connection first oil return inlet T and the second return opening K on the oil circuit that two actuator ports of hand-operated direction valve 11 are communicated with actuator, two the 4th oil circuits are provided with screwed plug, be respectively the first screwed plug 12 and the second screwed plug 13, realize two actuator ports of hand-operated direction valve 11 and the partition of return opening by the first screwed plug 12 and the second screwed plug 13.The actuator port A1 of the first commutation connection 102a is communicated with actuator with actuator port B1.Oil circuit between the filler opening that first commutates joins pressure-compensated valve 10 to oil outlet can arrange one-way valve, make the first commutation connection pressure-compensated valve 10 for load maintenance pressure-compensated valve.
Second commutation connection 102b can comprise the second commutation connection one-way valve 14 (commutation connection one-way valve), the second commutation connection pressure-compensated valve 15, pilot operated directional control valve 16, first overload oil compensating valve 17 and the first overload oil compensating valve 18.The oil outlet of the second commutation connection pressure-compensated valve 15 is communicated with the filler opening of pilot operated directional control valve 16, and second commutates joins the spring chamber and second of pressure-compensated valve 15 filler opening joining one-way valve 14 that commutates and be communicated with the load feedback hydraulic fluid port of pilot operated directional control valve 16; The return opening of pilot operated directional control valve 16 is communicated with the second one-way valve 6 with the first one-way valve 5 in first 101.All other the 4th oil circuit being connected to connection first oil return inlet T and the second return opening K on the oil circuit that two actuator ports of pilot operated directional control valve 16 are communicated with actuator, two the 4th oil circuits are provided with overload oil compensating valve, be respectively the first overload oil compensating valve 17 and the first overload oil compensating valve 18, realize being communicated with of pilot operated directional control valve 16 and the first one-way valve 5 and the second one-way valve 6 by the first overload oil compensating valve 17 and the first overload oil compensating valve 18.The actuator port A2 of the second commutation connection 102b is communicated with actuator with actuator port B2.Oil circuit between the filler opening that second commutates joins pressure-compensated valve 14 to oil outlet can arrange one-way valve, make the second commutation connection pressure-compensated valve 14 for load maintenance pressure-compensated valve.
3rd commutation connection 102c can comprise the 3rd commutation connection one-way valve 19, electric proportional reversing valve 21, first repairing one-way valve 22, the second repairing one-way valve 23 of the 3rd commutation connection pressure-compensated valve 20, first, a Ls relief valve 24 and the 2nd Ls relief valve 25.The oil outlet of the 3rd commutation connection pressure-compensated valve 20 is communicated with the filler opening of the first electric proportional reversing valve 21, and the 3rd commutates joins the spring chamber and the 3rd of pressure-compensated valve 20 filler opening joining one-way valve 19 that commutates and be communicated with the load feedback hydraulic fluid port of the first electric proportional reversing valve 21; The return opening of the first electric proportional reversing valve 21 is communicated with the second one-way valve 6 with the first one-way valve 5 in first 101, all other the 4th oil circuit being connected to connection first oil return inlet T and the second return opening K on the oil circuit that two actuator ports of the first electric proportional reversing valve 21 are communicated with actuator, two the 4th oil circuits are provided with repairing one-way valve, be respectively the first repairing one-way valve 22 and the second repairing one-way valve 23, realize being communicated with of the first electric proportional reversing valve 21 and the first one-way valve 5 and the second one-way valve 6 by the first repairing one-way valve 22 and the second repairing one-way valve 23.On the oil circuit that the first repairing one-way valve 22 and the second repairing one-way valve 23 are communicated with return opening respectively, side is connected to the 5th oil circuit, two the 5th oil circuits corresponding two load feedback oil circuits be communicated with between actuator and the first electric proportional reversing valve 21 respectively, two the 5th oil circuits all arrange Ls relief valve, be respectively a Ls relief valve 24 and the 2nd Ls relief valve 25, one Ls relief valve 24 is communicated with the load feedback hydraulic fluid port of the first electric proportional reversing valve 21 with one end of the 2nd Ls relief valve 25, and the other end is communicated with the second one-way valve 6 with the first one-way valve 5.The actuator port A3 of the 3rd commutation connection is communicated with actuator with actuator port B3.
4th commutation connection 102d can comprise the 4th commutation connection one-way valve 26, the electric proportional reversing valve 28 of the 4th commutation connection pressure-compensated valve 27, second, the 3rd screwed plug 29 and the 4th screwed plug 30.The oil outlet of the 4th commutation connection pressure-compensated valve 27 is communicated with the filler opening of the second electric proportional reversing valve 28, and the 4th commutates joins the spring chamber and the 4th of pressure-compensated valve 27 filler opening joining one-way valve 26 that commutates and be communicated with the load feedback hydraulic fluid port of the second electric proportional reversing valve 28; The return opening of the second electric proportional reversing valve 28 is communicated with the second one-way valve 6 with the first one-way valve 5 in first 101, all other the 4th oil circuit being connected to connection first oil return inlet T and the second return opening K on the oil circuit that two actuator ports of the second electric proportional reversing valve 28 are communicated with actuator, two the 4th oil circuits are provided with screwed plug, be respectively the 3rd screwed plug 29 and the 4th screwed plug 30, by the 3rd screwed plug 29 and the 4th screwed plug 30, realize two actuator ports of the second electric proportional reversing valve 28 and the partition of return opening.The actuator port A4 of the 4th commutation connection is communicated with actuator with actuator port B4.
Have in the specific embodiment of the load sensing multi-way valve of four commutation connection above-mentioned, hydraulic oil from load sensitive pump enters from total oil inlet P of load sensing multi-way valve near first 101 position, and commutating with first pressure-compensated valve 1, meta unloading valve 8, first joins pressure-compensated valve 10, second and commutate and join pressure-compensated valve 15, the 3rd and commutate and join pressure-compensated valve 20 and the 4th filler opening joining pressure-compensated valve 27 that commutates and be communicated with.
The load sensing multi-way valve that the utility model provides, one group of connection one-way valve that commutates (such as: the first commutation connection one-way valve 9, second commutation connection one-way valve 14, the 3rd commutation connection one-way valve 19 and the 4th commutation join one-way valve 26) is adopted to replace shuttle valve to select the highest Ls pressure signal of load sensing multi-way valve, simplify multi-way valve internal galleries, structurally more easily make integral multitandem valve.
When the commutation connection work of the load sensing multi-way valve that the utility model provides, pressure oil enters from total oil inlet P, arrive the first commutation connection pressure-compensated valve 10, second commutation connection pressure-compensated valve 15, the filler opening of the 3rd commutation connection pressure-compensated valve 20 and the 4th commutation connection pressure-compensated valve 27, first commutation connection pressure-compensated valve 10, second commutation connection pressure-compensated valve 15, the other end effect Ls pressure of the 3rd commutation connection pressure-compensated valve 20 and the 4th commutation connection pressure-compensated valve 27, first commutation connection pressure-compensated valve 10, second commutation connection pressure-compensated valve 15, the spring of the spring chamber of the 3rd commutation connection pressure-compensated valve 20 and the 4th commutation connection pressure-compensated valve 27 makes hand-operated direction valve 11, pilot operated directional control valve 16, before and after the spool of the first electric proportional reversing valve 21 and the second electric proportional reversing valve 28, pressure reduction keeps constant, thus make the throttling groove opening of each selector valve working flow only with selector valve main valve plug relevant, and have nothing to do with load, and by the first commutation connection pressure-compensated valve 10, second commutation connection pressure-compensated valve 15, the pressure surge of Ls signal is filtered in second damping 203 (as shown in Figure 3) of the 3rd commutation connection pressure-compensated valve 20 and the 4th commutation connection pressure-compensated valve 27 left end, increase the stationarity of hydraulic system.
The utility model adopts the first commutation connection one-way valve 9, second commutation connection one-way valve 14, the 3rd commutation connection one-way valve 19 and the 4th commutation to join one-way valve 26, the Ls pressure of each commutation connection is compared, thus obtaining maximum Ls pressure, the first 101 through load sensing multi-way valve feeds back to pump load sensitivity and controls mouth.When hand-operated direction valve 11, pilot operated directional control valve 16, when the main valve plug of the first electric proportional reversing valve 21 and the second electric proportional reversing valve 28 is worked by working position commutation meta, the pressure of actuator port is through hand-operated direction valve 11, pilot operated directional control valve 16, the throttle orifice of the first electric proportional reversing valve 21 and the second electric proportional reversing valve 28 valve core inside flows back to return opening, and the endoceliac Ls pressure of valve flows back to return opening through the dynamic antivibration valve 7 that load sensing multi-way valve first 101 is arranged, meta Ls oil circuit is avoided to produce pocketed oil, filter the fluctuation of Ls pressure in commutation process, slow down the impact of Ls pressure.
In the illustrative examples of the load sensing multi-way valve provided at the utility model, in tail connection 103, can comprise that reduction valve 31, the 3rd one-way valve 32 and the 4th one-way valve 33, L are drain tap, T3, T4 are return opening, A0 is electric proportional reversing valve guide hydraulic fluid port.The pressure oil of pump discharge is through total oil inlet P, through each work connection oil duct, arrive the reduction valve 31 of tail connection 103, to be arrived the pilot port of the second electric proportional reversing valve 28 in the pilot port of the first electric proportional reversing valve 21 in the 3rd commutation connection 102c and the 4th commutation connection 102d by tail connection oil duct through post-decompression pressure oil, thus control the motion of spool; 3rd one-way valve 32 is communicated with the return opening of the second electric proportional reversing valve 28 with hand-operated direction valve 11, the electric proportional reversing valve 21 of pilot operated directional control valve 16, first with the filler opening of the 4th one-way valve 33, and the 3rd one-way valve 32 is communicated with oil return inlet T 4 with oil return inlet T 3 with the oil outlet of the 4th one-way valve 33 is corresponding respectively.
In the illustrated embodiment of the load sensing multi-way valve provided at above-mentioned the utility model, the position of installing the first damping 2 in first can be arranged to stifled 3, the first damping 2 is arranged in the position of installing stifled 3, hydraulic system can be switched to metering pump load sensing multi-way valve control system by variable displacement pump load sensing multi-way valve control system.First pressure-compensated valve 1 and first commutates and joins pressure-compensated valve 10, second commutation connection pressure-compensated valve 15, 3rd commutation connection pressure-compensated valve 20 and the 4th commutation connection pressure-compensated valve 27 parallel connection control system, can ensure to adapt between the delivery pressure of oil hydraulic pump and highest load pressure, when hand-operated direction valve 11, pilot operated directional control valve 16, when the throttling spool channel opening of the first electric proportional reversing valve 21 and the second electric proportional reversing valve 28 is constant, load feedback is realized by automatically regulating the flow of first pressure-compensated valve 1 opening, thus the pressure difference stablized before and after each selector valve, its flow is kept to change with load needs.
Based on the principle of the load sensing multi-way valve that above-mentioned the utility model provides, the utility model additionally provides the valve body structure of load sensing multi-way valve.
As shown in Figure 2, for the valve body structure illustrative examples of the hydraulic control leading type load sensing multi-way valve that the utility model provides, in this illustrative examples, load sensing multi-way valve comprises first 101, commutation connection 102, tail connection 103, stud 104 and nut 105 etc.First 101, commutation connection 102 and tail connection 103 are integrated valve body structure.Commutation connection 102 adopts modular design, its quantity is determined according to requirement in practical systems, for system layout is provided convenience, and commutation first guide's hydraulic fluid port 106 of connection 102 and second guide's hydraulic fluid port 107 are installed in the same side of valve body, facilitate pipeline to install and safeguard.The load sensing multi-way valve that the utility model provides is connected with nut 105 by stud 104, one end of stud 104 is screwed in first valve body, commutation connection valve body and tail connection valve body and is tightened by nut 105, and first 101, commutation connection 102 and tail connection 103 are fixed as one by several stud 104 and nut 105.Between each valve body of first 101, commutation connection 102, tail connection 103, O shape circle is installed, seals.
As shown in Figure 3, for the illustrative examples of the connection that commutates in the load sensing multi-way valve that the utility model provides, in this illustrative examples, commutation connection comprises commutation connection valve body 201, selector valve main valve core bore is provided with in commutation connection valve body 201, be provided with selector valve main valve plug 213 in selector valve main valve core bore, in selector valve main valve plug 213, be provided with internal galleries.Selector valve main valve plug 213 moves in selector valve main valve core bore, realize selector valve in left position, the conversion of right position and meta, wherein, left position and right position are the working position of selector valve.
The internal galleries arranged in selector valve main valve plug 213 is communicated with the load feedback groove 203 (load feedback hydraulic fluid port) of selector valve, and the oil circuit be communicated with the load feedback groove 203 of selector valve at internal galleries is provided with filter screen 211,212.
When commutation is turned right or turned left to selector valve main valve plug 213, the induced pressure of actuator port A or actuator port B arrives the filter screen 211 arranged in selector valve main valve plug 213 internal galleries by the internal galleries of selector valve main valve plug 213, 212, by filter screen 211, 212 filter the pollutant in working connection, prevent from blocking the damping hole in load feedback loop, then load feedback groove 302 is arrived, one end of the second damping 203 is arrived by commutation connection valve body 201 internal galleries, second damping 203 is for filtering the load shock of Ls pressure feedback to commutation connection pressure-compensated valve spring chamber, reduce load sensing multi-way valve pressure surge in the course of the work.The induced pressure of actuator port A or actuator port B passes through combination throttling groove 218 or the combination throttling groove 217 of setting on selector valve main valve plug 213 simultaneously, then through the right-hand member of the internal galleries arrival pressure compensation spool 202 of commutation connection valve body 201.Pump discharge pressure oil joins the left end of oil inlet P through pressure compensation spool 202 internal galleries arrival pressure compensation spool 202 of valve body 201 from commutation, the Ls pressure initiation constant pressure difference of oil inlet P pressure and actuator port feedback, namely selector valve main valve plug 213 pressure reduction is constant, then working hole flow is only relevant with the throttling groove opening of selector valve main valve plug 213.
Commutate in the illustrative examples of the valve body structure joined in the load sensing multi-way valve that the utility model provides, commutation connection valve body can also be provided with guide structure, guide structure can comprise the first end cap 204, second end cap 214 and the guide's hydraulic fluid port be arranged on the first end cap 204 or the second end cap 214, first end cap 204 and commutation join between valve body 201 and form the first guide oil chamber, second end cap 214 and commutation join between valve body 201 and form the second guide oil chamber, guide's hydraulic fluid port comprises first guide's hydraulic fluid port and second guide's hydraulic fluid port, the hydraulic oil entering the first guide oil chamber by first guide's hydraulic fluid port or the hydraulic oil entering the second guide oil chamber by second guide's hydraulic fluid port and the commutation guide oil passage joined on valve body 201 can drive the selector valve main valve plug 213 of selector valve to move in selector valve main valve core bore, realize the conversion of selector valve working position and meta.
In above-mentioned illustrative examples, first end cap 204 or the second end cap 214 can also be removably connected with stroke adjustment parts, stroke adjustment parts can be locked in the diverse location place of the first end cap 204 or the second end cap 214 along the movement direction of selector valve main valve plug 213, when selector valve main valve plug 213 moves to left position or right position and stroke adjustment parts abut against.
In above-mentioned illustrative examples, the guide structure of commutation connection can also comprise and is arranged on spring in the first guide oil chamber and spring seat, wherein one end of spring and spring seat deviate from the part joining valve body that commutates and abut against, and the end of the elastic force driving spring seat of spring and selector valve main valve plug 213 abuts against, spring seat is provided with spring seat close to the position at arris place, selector valve main valve plug 213 end and leads to oil groove.
In above-mentioned illustrative examples, selector valve main valve plug 213 is provided with logical oil groove, when selector valve main valve plug moves, logical oil groove and commutation can be made to join to be formed between valve body gas in the hydraulic oil in permission first guide oil chamber or the second guide oil chamber by and the air be communicated with the return opening of selector valve gets rid of passage.
Enumerate a specific embodiment of the guide structure of commutation connection below, in this specific embodiment, the guide structure of commutation connection can comprise the first end cap 204 and the second end cap 214 being arranged on commutation connection valve body 201 two ends, and sealing nut 205, stroke regulating screw 206 (stroke adjustment parts), spring seat 207, spring 208, fastening screw trip bolt 209, spring seat 210, sealing nut 215, stroke regulating screw 216 (stroke adjustment parts) etc.First end cap 204, second end cap 214 is arranged on commutation connection valve body 201 by screw, and its surface of contact adopts O shape circle to seal.The stroke of selector valve main valve plug 213 is controlled by stroke regulating screw 206, stroke regulating screw 216, stroke regulating screw 206 is threaded connection and is arranged on the first end cap 204, sealed by sealing nut 205, stroke regulating screw 216 is threaded connection and is arranged on the second end cap 214, is sealed by sealing nut 215.
Spring seat 207,210 and spring 208 are connected to selector valve main valve plug 213 one end by fastening screw trip bolt 209, fastening screw trip bolt 209 is connected to the end face of selector valve main valve plug 213, the pre-compression force of spring 208 makes the end face of spring one end contact spring seat 207, the end face of end thereof contacts spring seat 210.
As Fig. 4, shown in Fig. 5, the two ends of selector valve main valve plug 213 are provided with logical oil groove 220 and logical oil groove 221, spring seat 210 is also provided with logical oil groove 219, when selector valve main valve plug 213 starts to turn right commutation work, guide oil in first end cap 204 chamber arrives logical oil groove 219, and flow into groove 301 by the logical oil groove 220 on selector valve main valve plug 213, then groove 303 is flowed into by the throttling groove on selector valve main valve plug 213, be communicated with the commutation oil return inlet T joined on valve body 201, when selector valve main valve plug 213 starts to turn left commutation work, guide oil in second end cap 214 chamber is communicated to the oil return inlet T on change valve 201 by the logical oil groove 221 on selector valve main valve plug 213, not only the air in first guide cavity can be got rid of but also compression shock when commutation connection commutates can be slowed down.
In sum, the load sensing multi-way valve that the utility model provides adopts modular design, commutation connection quantity can be determined according to engineering machinery host computer system demand, for system layout is provided convenience, variable mode both can realize variable displacement pump load sensitive system, can realize metering pump load sensitive system again.
Wherein, the load sensing multi-way valve that variable displacement pump controls is a kind of multiple directional control valve with pressure compensation, during load sensing multi-way valve commutation connection work, pressure reduction before and after main valve plug is made to keep constant by the pressure compensator before valve, when carrying out composite move, each work connection can be separate, and the flow of system is only relevant with the throttling groove opening of spool, and has nothing to do with induced pressure.The pressure compensator parallel operation that the load sensing multi-way valve that metering pump controls is arranged before joining valve by the first pressure-compensated valve that first is arranged with commutation, the flow of the first pressure-compensated valve opening arranged by automatically regulating first realizes load feedback, thus the pressure difference stablized before and after each selector valve, keep its flow to change with load needs.
The utility model load sensing multi-way valve adopts one group of one-way valve to replace shuttle valve to select the highest Ls pressure signal of load sensing multi-way valve, simplifies multi-way valve oil duct, structurally both can adopt slice structure, more easily adopt monolithic construction again; Functionally can select the functions such as Ls dynamic antivibration function, meta unloading function, relief valve function, overload oil compensating valve/Fill valve, Ls relief valve, pilot control can need to adopt manually according to engineering machinery main frame, hydraulic control, electric control operation, and change-over valve core is provided with the structure such as filter screen, logical oil groove, the HYDRAULIC CONTROL SYSTEM demand of different main frame can be realized by the combination of above difference in functionality, realize multi-purpose valve, reduce the manufacturing cost of multiple directional control valve.
Also show multiple hydraulic fluid port in Fig. 1, wherein, P2 is filler opening; T3 and T4 is return opening; MP1 and MP2 is oil-feed pressure tap; MLs is Ls pressure tap; A2 and b2 is the pilot control opening of selector valve in the second commutation connection.
According to the description of each embodiment above-mentioned, the utility model can be derived at least there is following beneficial effect:
1) the utility model is by adopting modular design, the several functions of load sensing multi-way valve is merged, according to the function requirement of hydraulic system, different function modules is combined, just can be combined into the load sensing multi-way valve required for hydraulic system, decrease the quantity of load sensing multi-way valve, and the HYDRAULIC CONTROL SYSTEM demand of different main frame can be realized by the combination of above difference in functionality, realize multi-purpose valve, reduce the manufacturing cost of multiple directional control valve.
2) the utility model is by the conversion of damping and stifled position, and the break-make that can change oil circuit realizes freely switching of variable displacement pump load sensing multi-way valve and metering pump load sensing multi-way valve.
3) the utility model load sensing multi-way valve first is provided with main safety valve, the main of main safety valve adopts sliding valve style, and pilot stage adopts thread cartridge valve type, meets the demand of the load sensing multi-way valve of more rated flow, and the pressure loss is little, open and shut characteristic is good.
4) in the utility model load sensing multi-way valve, first arranges meta unloading valve, when load sensing multi-way valve meta, the flow of load-reacting pump is uninstalled, keep pump to be in low-pressure state, avoid engineering machinery flame-out when engine start.
5) the utility model load sensing multi-way valve first arranges dynamic antivibration valve, when each commutation connection spool is commutated meta work by working position, pressure in multi-way valve Ls oil circuit flows back to return opening through dynamic antivibration valve, meta Ls oil circuit is avoided to produce pocketed oil, and filter the fluctuation of Ls pressure in commutation process, slow down the impact of Ls pressure.
6) the utility model is at the one-way valve of integrated two different pressures of multi-way valve first, when oil liquid temperature height, oil return enters cooler cooling by the one-way valve that pressure set points is low, when oil liquid temperature is low, by the direct oil sump tank of one-way valve that setting value is high, prevent because oil viscosity is large, flow resistance is large and damage cooler.
7) the utility model load sensing multi-way valve is when each commutation connection work, the operations such as pilot control functionally can realize manually according to engineering machinery host requirements, hydraulic control, electrical-liquid control, and the pilot control opening of load sensing multi-way valve can be arranged on valve body the same side, facilitate pipeline to install and safeguard.
8) the utility model is when each commutation connection work, the oil circuit that Ls enters pressure-compensated valve spring chamber arranges a damping, filter Ls pressure feedback to the load shock of spring chamber, decrease the fluctuation of pressure-compensated valve, reduce multi-way valve pressure surge in the course of the work.
9) the utility model arranges reduction valve at tail connection, after the pressure of multi-way valve major loop is reduced pressure by reduction valve, directly can provide pilot control for pilot handle, not need to increase the pioneer pump that pilot control is additionally provided again, and greatly can simplify hydraulic pipe line connection.
10) in the utility model, selector valve main valve plug load feedback oil circuit control is provided with filter screen, when each commutation connection work, the filter structure that selector valve main valve plug is arranged can prevent because working connection pollutant enters load feedback loop, damping hole blocking in load feedback oil circuit control, filter structure is simple, install and change conveniently, cost is low.
11) the utility model is when each commutation connection work, and the different throttling groove combinations that main valve plug is arranged, make the induced pressure of A/B mouth communicate with Ls feedback channel, eliminate the shuttle valve of A/B hydraulic fluid port pressure selection.
12) end face that in the utility model, load sensing multi-way valve commutation connection valve core spring seat coordinates with guide's end cap and valve body is processed with logical oil groove, increase selector valve main valve plug starts pilot pressure active area when commutating, when selector valve main valve plug meta, and by the groove that selector valve main valve plug is processed, pilot pressure is communicated with return opening, both the gas in guide's end cap chamber can have been discharged, the compression shock during commutation of commutation connection can be slowed down again, increase spool commutation responsiveness.
13) the utility model arranges stroke regulating screw on end cap, and easily by the stroke of adjustment stroke adjusting screw restriction valve core of multiway valve, thus can regulate the flow of commutation connection, structure is simple, and cost is low.
In description of the present utility model; it will be appreciated that; the word such as " first ", " second ", " the 3rd ", " the 4th " is used to limit component; be only used to be convenient to distinguish above-mentioned parts; as there is no Stated otherwise; above-mentioned word does not have particular meaning, therefore can not be interpreted as the restriction to the utility model protection domain.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; All employings are equal to the load sensing multi-way valve theory and structure of replacement or equivalent transformation formation; all drop in the protection domain of the utility model requirement; and not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technological scheme scope of the utility model request protection.

Claims (22)

1. a load sensing multi-way valve, it is characterized in that: comprise first (101) and tail connection (103), and be arranged in parallel one or more commutation theed join between (103) in described first (101) and described tail and join (102), also comprise total filler opening, the first return opening and total load feedback hydraulic fluid port;
Described commutation connection (102) comprises selector valve, commutation connection pressure-compensated valve and commutation connection one-way valve;
Described commutation connection pressure-compensated valve is communicated with the filler opening of described total filler opening and described selector valve, and the actuator port of described selector valve is communicated with actuator, and the return opening of described selector valve is communicated with described first return opening; Described commutation joins the load feedback hydraulic fluid port that one-way valve is communicated with described total load feedback hydraulic fluid port and described selector valve, and on the oil circuit that described commutation connection one-way valve is communicated with the load feedback hydraulic fluid port of described selector valve, also side is connected to the first oil circuit being communicated with the described spring chamber joining pressure-compensated valve that commutates.
2. load sensing multi-way valve as claimed in claim 1, is characterized in that: described first (101) comprises first pressure-compensated valve (1) and safety valve (4); The filler opening of described first pressure-compensated valve (1) is communicated with described total filler opening, and the oil outlet of described first pressure-compensated valve (1) is communicated with described first return opening with the oil outlet of described safety valve (4);
Described total filler opening is also communicated with the spring chamber of described first pressure-compensated valve (1) and the filler opening of described safety valve (4) by the second oil circuit; Described total load feedback hydraulic fluid port is also communicated with the spring chamber of described first pressure-compensated valve (1) and the filler opening of described safety valve (4) by the 3rd oil circuit;
Different according to from the pump that total filler opening is communicated with, selectivity is arranged as follows:
Described second oil circuit arranges the first damping (2), corresponding, described 3rd oil circuit is arranged stifled (3);
Or,
Described second oil circuit is arranged stifled (3), corresponding, described 3rd oil circuit arranges the first damping (2).
3. load sensing multi-way valve as claimed in claim 1, is characterized in that: described first oil circuit is provided with the second damping.
4. load sensing multi-way valve as claimed in claim 1, it is characterized in that: on the oil circuit that the actuator port of described selector valve is communicated with actuator, side is connected to the 4th oil circuit being communicated with described first return opening, and described 4th oil circuit arranges screwed plug, unidirectional Fill valve or overload oil compensating valve.
5. load sensing multi-way valve as claimed in claim 4, it is characterized in that: on described 4th oil circuit, unidirectional Fill valve is set, on the oil circuit that described unidirectional Fill valve is communicated with described first return opening, side is connected to the 5th oil circuit, described 5th oil circuit is communicated with the load feedback oil circuit between described actuator and described selector valve, and described 5th oil circuit is provided with Ls relief valve.
6. load sensing multi-way valve as claimed in claim 4, it is characterized in that: described overload oil compensating valve comprises the precursor overflow valve of parallel communication and unidirectional Fill valve, the filler opening of described precursor overflow valve and the oil outlet of described unidirectional Fill valve are communicated with the oil circuit between the actuator port of described selector valve and described actuator, and the oil outlet of described precursor overflow valve is communicated with described first return opening with the filler opening of described unidirectional Fill valve.
7. load sensing multi-way valve as claimed in claim 1, is characterized in that: described commutation connection pressure-compensated valve comprises reduction valve, and the filler opening of described reduction valve is communicated with described total filler opening, and the oil outlet of described reduction valve is communicated with the filler opening of described selector valve.
8. load sensing multi-way valve as claimed in claim 7, is characterized in that: the oil circuit that the filler opening of described reduction valve is communicated with oil outlet also arranges one-way valve.
9. load sensing multi-way valve as claimed in claim 2, it is characterized in that: described first (101) also comprises meta unloading valve (8), the filler opening of described meta unloading valve (8) is communicated with described total filler opening, the oil outlet of institute's rheme unloading valve (8) is communicated with described first return opening, and the spring chamber of described meta unloading valve (8) feeds back hydraulic fluid port with described total load and is communicated with.
10. the load sensing multi-way valve as described in claim 2 or 9, it is characterized in that: described first (101) also comprises dynamic antivibration valve (7), the filler opening of described dynamic antivibration valve (7) feeds back hydraulic fluid port with described total load and is communicated with, the oil outlet of described dynamic antivibration valve (7) is communicated with described first return opening, feed back on oil circuit that hydraulic fluid port is communicated with in described dynamic antivibration valve (7) and described total load and be provided with the 3rd damping, the spring chamber of described dynamic antivibration valve (7) is communicated with the oil circuit between described 3rd damping and the filler opening of described dynamic antivibration valve (7), being communicated with described 3rd damping and described total load without spring chamber and feeding back oil circuit between hydraulic fluid port of described dynamic antivibration valve (7).
11. load sensing multi-way valves as claimed in claim 2, it is characterized in that: on the oil circuit that the oil outlet of described first pressure-compensated valve (1) is communicated with described first return opening, be provided with the first one-way valve (5), the oil outlet of described first pressure-compensated valve (1) is also communicated with the second return opening, and the oil circuit that the oil outlet of described first pressure-compensated valve (1) is communicated with described second return opening also arranges the second one-way valve (6); The oil outlet of described safety valve (4) is also communicated with the filler opening of described first one-way valve (5) and the second one-way valve (6).
12. load sensing multi-way valves as claimed in claim 1, it is characterized in that: described tail connection (103) comprises two tail connection one-way valves, the filler opening of two described tail connection one-way valves is communicated with the return opening of each described described selector valve in joining that commutates, and the oil outlet of two described tail connection one-way valves is communicated with fuel tank.
13. load sensing multi-way valves as claimed in claim 1, is characterized in that: described selector valve is hand-operated direction valve (11), electric change valve, pilot operated directional control valve (16) or electric proportional reversing valve.
14. load sensing multi-way valves as claimed in claim 13, it is characterized in that: when selector valve is electric proportional reversing valve, also reduction valve is comprised in described tail connection, the filler opening of described reduction valve is communicated with total filler opening, and the oil outlet of described reduction valve is communicated with the pilot port of the electric proportional reversing valve in described commutation connection.
15. load sensing multi-way valves as claimed in claim 1, it is characterized in that: described first (101), described commutation connection (102) and described tail connection (103) are integrated valve body structure, described first (101), described commutation connection (102) and described tail connection (103) are fixed as one by stud and nut.
16. load sensing multi-way valves as claimed in claim 15, it is characterized in that: described commutation connection (102) comprises commutation connection valve body (201), selector valve main valve core bore is provided with in described commutation connection valve body (201), be provided with selector valve main valve plug (213) in described selector valve main valve core bore, in described selector valve main valve plug (213), be provided with internal galleries.
17. load sensing multi-way valves as claimed in claim 16, it is characterized in that: the internal galleries arranged in described selector valve main valve plug (213) is communicated with the load feedback groove of described selector valve, and the oil circuit be communicated with the load feedback groove of described selector valve at described internal galleries is provided with filter screen.
18. load sensing multi-way valves as claimed in claim 16, it is characterized in that: described commutation connection valve body (201) is provided with guide structure, described guide structure comprises the first end cap (204), second end cap (214) and the guide's hydraulic fluid port be arranged on described first end cap (204) or described second end cap (214), described first end cap (204) and described commutate to join between valve body (201) form the first guide oil chamber, described second end cap (214) and described commutate to join between valve body (201) form the second guide oil chamber, described guide's hydraulic fluid port comprises first guide's hydraulic fluid port and second guide's hydraulic fluid port, the hydraulic oil entering described first guide oil chamber by described first guide's hydraulic fluid port or the hydraulic oil entering described second guide oil chamber by described second guide's hydraulic fluid port and the described guide oil passage joined on valve body (201) that commutates can drive the selector valve main valve plug (213) of described selector valve to move in selector valve main valve core bore, realize the conversion of described selector valve working position and meta.
19. load sensing multi-way valves as claimed in claim 18, it is characterized in that: described guide structure also comprises and is arranged on spring in described first guide oil chamber and spring seat, wherein one end of described spring and described spring seat deviate from the described part that joins valve body (201) of commutating and to abut against and the elastic force of described spring drives the end of described spring seat and described selector valve main valve plug (213) to abut against, and described spring seat is provided with spring seat close to the position at arris place, described selector valve main valve plug (213) end and leads to oil groove.
20. load sensing multi-way valves as claimed in claim 18, it is characterized in that: described selector valve main valve plug (213) is provided with logical oil groove, when described selector valve main valve plug (213) is mobile, can make described logical oil groove with described commutate join to be formed between valve body (201) allow the gas in the hydraulic oil in described first guide oil chamber or described second guide oil chamber by and the air be communicated with the return opening of described selector valve gets rid of passage.
21. load sensing multi-way valves as claimed in claim 18, it is characterized in that: described first end cap (204) or described second end cap (214) are removably connected with stroke adjustment parts, described stroke adjustment parts can be locked in the diverse location place of described first end cap (204) or described second end cap (214) along the movement direction of described selector valve main valve plug (213), when described selector valve main valve plug (213) moves to left position or right position and described stroke adjustment parts abut against.
22. 1 kinds of construction machinery hydraulic systems, is characterized in that: comprise the load sensing multi-way valve as described in any one of claim 1-21.
CN201520032890.4U 2015-01-16 2015-01-16 Load sensing multi-way valve and construction machinery hydraulic system Withdrawn - After Issue CN204493324U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105422533A (en) * 2015-11-25 2016-03-23 贵州詹阳动力重工有限公司 Multi-functional hydraulic output platform of excavator
CN105840574A (en) * 2015-01-16 2016-08-10 徐工集团工程机械股份有限公司 Load-sensitive multi-way valve and hydraulic system of engineering machine
CN108150676A (en) * 2018-02-05 2018-06-12 江苏恒立液压科技有限公司 Multi-way valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840574A (en) * 2015-01-16 2016-08-10 徐工集团工程机械股份有限公司 Load-sensitive multi-way valve and hydraulic system of engineering machine
CN105840574B (en) * 2015-01-16 2018-04-06 徐工集团工程机械股份有限公司 Load sensing multi-way valve and construction machinery hydraulic system
CN105422533A (en) * 2015-11-25 2016-03-23 贵州詹阳动力重工有限公司 Multi-functional hydraulic output platform of excavator
CN108150676A (en) * 2018-02-05 2018-06-12 江苏恒立液压科技有限公司 Multi-way valve

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