CN204284049U - Pressure controlled valve group, hydraulic system and engineering mechanical device - Google Patents
Pressure controlled valve group, hydraulic system and engineering mechanical device Download PDFInfo
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- CN204284049U CN204284049U CN201420306740.3U CN201420306740U CN204284049U CN 204284049 U CN204284049 U CN 204284049U CN 201420306740 U CN201420306740 U CN 201420306740U CN 204284049 U CN204284049 U CN 204284049U
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Abstract
The utility model relates to a kind of pressure controlled valve group, hydraulic system and engineering mechanical device, pressure controlled valve group comprises: based on being applied in the guide proportion pressure valve of electric current determination preset pressure and being opened the directional control valve of system oil return oil circuit by the hydraulic system switching to pressure controlled valve group to apply, and the switching of directional control valve is controlled by the preset pressure of guide proportion pressure valve and the height relation of system pressure.Pressure controlled valve group of the present utility model have employed the guide proportion pressure valve that can set multiple preset pressure by applying size of current, compared to existing pressure controlled valve group, the utility model can realize the control of multistage pressure on the basis using less element, only need to be electrically connected guide proportion pressure valve simultaneously, avoid the misconnection problem that existing pressure controlled valve group easily produces, and pressure adjusting point is less than existing pressure controlled valve group, therefore improve the debugging efficiency of pressure adjusting operation, save debug time.
Description
Technical field
The utility model relates to hydraulics, particularly relates to a kind of pressure controlled valve group, hydraulic system and engineering mechanical device.
Background technique
Hydraulic element are the necessary component forming oil hydraulic circuit, and the hydraulic element of multiple difference in functionality can form the oil hydraulic circuit with certain function.Pressure control circuit is exactly a kind of typical hydraulic elementary circuits, its objective is the maximum pressure set up or limit hydraulic power, realizes the adjustment of multistage pressure, control and switching.
As shown in Figure 1, be the schematic diagram of the pressure control circuit of existing system for hydraulic system of truck crane.In pressure control circuit shown in Fig. 1, after the remote control mouth A of main pressure valve a9 commutates by electromagnetic direction valve a3, a5, a7, be connected with guide's direct acting pressure valve a4, a6, a8 respectively, realize controlling three stage pressures of the rodless cavity pressure of hydraulic jack a2.
When electromagnetic direction valve a3, a5, a7 all must not electricity time, hydraulic system is pressure unloading condition, and the outlet pressure of pump a1 only needs the spring force overcoming main pressure valve a9, and namely main pressure valve a9 opens system oil return, makes hydraulic oil flow back to hydraulic oil container a10.So system pressure is only the spring force of main pressure valve a9, and this spring force is less, generally this state pressure is assumed to be 0.
When electromagnetic direction valve a3 obtains electric, the remote control mouth A of main pressure valve a9 is connected with guide's direct acting pressure valve a8, now pump a1 outlet pressure by first overcome guide's direct acting pressure valve a8 setting pressure after, main pressure valve a9 just can open and carry out system oil return, so system pressure is the setting pressure of sequence 8 guide direct acting pressure valve.
When only electromagnetic direction valve a5 obtains electric, the remote control mouth A of main pressure valve a9 is connected with guide's direct acting pressure valve a8, a4, after now the outlet pressure of pump a1 will overcome less setting pressure in guide's direct acting pressure valve a8, a4 (being generally set to guide's direct acting pressure valve a4 setting pressure to be less than the setting pressure of guide's direct acting pressure valve a8), main pressure valve a9 just can open and carry out system oil return, so system pressure is the setting pressure of guide's direct acting pressure valve a4.
When only electromagnetic direction valve a7 obtains electric, the remote control mouth A of main pressure valve a9 is connected with guide's direct acting pressure valve a8, a6, after now the outlet pressure of pump a1 will overcome less setting pressure in guide's direct acting pressure valve a8, a6 (being generally set to guide's direct acting pressure valve a6 setting pressure to be less than the setting pressure of guide's direct acting pressure valve a8), main pressure valve a9 just can open and carry out system oil return, so system pressure is the setting pressure of guide's direct acting pressure valve a6.
The hydraulic element that surround of double dot dash line and oil circuit can be realized by pressure controlled valve group in FIG.Wherein, electromagnetic direction valve a3, a5, a7 and guide's direct acting pressure valve a4, a6, a8 are screw-in cartridge valve, screw into valve body by element, then main pressure valve a9 is superimposed to plane on valve body by bolts assemblies, is commonly referred to as board-like installation.And there are between main pressure valve a9 and valve body three ditch oil canals, namely the A/B/C shown in Fig. 1, its fluid flows into the B mouth of main pressure valve a9 from valve body, flow out from the C mouth of main pressure valve a9 again, the fluid simultaneously flowing into the B mouth of main pressure valve a9 also can flow out from A mouth, each electromagnetic direction valve and guide's direct acting relief valve is flow to again, which form the Stress control principle of aforementioned fluid flowing after entering valve body.
Although existing pressure control circuit and valve group can realize the Stress control of hydraulic system, but still there is following defect:
1, existing pressure control circuit is in order to realize three stage pressures controls of hydraulic system, need 7 hydraulic parts, cause loop structure complicated, because flow path during system overflow is tortuous, cause system relief power loss large, and the power of loss is transformed into heat, hydraulic oil can be caused again further to generate heat perishable;
2, existing pressure control circuit can only realize three Stress control, cannot meet the more pressure spot of system and control;
3, the main pressure valve cost of existing pressure control circuit is high, volume is large, because main pressure valve a9 and valve body are board-like installation, the corresponding valve volume superposed with it is excessive too, finally makes that the volume of pressure controlled valve group entirety is large, weight is large, cost is high;
4, existing pressure controlled valve group is when products application, owing to having 3 electrical control points of electromagnetic direction valve a3, a5, a7,4 pressure adjusting points of guide's direct acting pressure valve a4, a6, a8 and main pressure valve a9, therefore when actual product assembles, the easy connection error of electrical control point; And when actual product is debugged, pressure adjusting process efficiency is low, the time is long.
Model utility content
The purpose of this utility model proposes a kind of pressure controlled valve group, hydraulic system and engineering mechanical device, can realize multistage pressure control with more succinct structure.
For achieving the above object, the utility model provides a kind of pressure controlled valve group, comprise: based on being applied in the guide proportion pressure valve of electric current determination preset pressure and being opened the directional control valve of system oil return oil circuit by the hydraulic system switching to described pressure controlled valve group to apply, the switching of described directional control valve is controlled by the preset pressure of described guide proportion pressure valve and the height relation of described system pressure.
Further, also comprise: based on guide's direct acting pressure valve of spring force determination preset pressure with by switching the manual directional control valve changing described directional control valve Controlled vocabulary, under the different switching states of described manual directional control valve, switching in of described directional control valve is controlled by the preset pressure of described guide proportion pressure valve and the height relation of described system pressure, and is controlled by between the preset pressure of guide's direct acting pressure valve and the height relation of described system pressure and selects a selection.
Further, comprise the valve body that inside is provided with many oil ducts, described guide proportion pressure valve and directional control valve each other, and are communicated with by the oil duct in described valve body between the hydraulic system applied with described pressure controlled valve group.
Further, described guide proportion pressure valve and directional control valve are screw-in cartridge valve, screw into described valve body by valve member.
Further, described valve body has valve body filler opening and valve body return opening, described directional control valve has filler opening, the left and right control chamber at return opening and spool two ends, described guide proportion pressure valve has filler opening and return opening, the filler opening of described directional control valve and return opening communicate with described valve body filler opening and valve body return opening respectively, the left and right control chamber of described directional control valve communicates with the filler opening of described valve body filler opening and described guide proportion pressure valve respectively, the return opening of described guide proportion pressure valve communicates with described valve body return opening, oil duct between the filler opening of described guide proportion pressure valve and described valve body filler opening is provided with damping, by switching described directional control valve, be switched on or switched off the straight-through oil duct between described valve body filler opening and valve body return opening.
Further, the oil duct between the filler opening of described guide proportion pressure valve and the control chamber of described directional control valve is also provided with damping.
Further, comprise the valve body that inside is provided with many oil ducts, described guide proportion pressure valve, directional control valve, guide's direct acting pressure valve and manual directional control valve each other, and are communicated with by the oil duct in described valve body between the hydraulic system applied with described pressure controlled valve group.
Further, described guide proportion pressure valve, directional control valve, guide's direct acting pressure valve and manual directional control valve are screw-in cartridge valve, screw into described valve body by valve member.
Further, described valve body has valve body filler opening and valve body return opening, described directional control valve has filler opening, the left and right control chamber at return opening and spool two ends, described guide proportion pressure valve and guide's direct acting pressure valve all have filler opening and return opening, described manual directional control valve has filler opening, return opening and an actuator port, the filler opening of described directional control valve and return opening communicate with described valve body filler opening and valve body return opening respectively, the left and right control chamber of described directional control valve communicates with the filler opening of described valve body filler opening and described manual directional control valve respectively, the return opening of described guide proportion pressure valve and guide's direct acting pressure valve all communicates with described valve body return opening, the filler opening of described guide proportion pressure valve and guide's direct acting pressure valve communicates with the return opening of described manual directional control valve and actuator port respectively, oil duct between the filler opening of described manual directional control valve and described valve body filler opening is provided with damping, by switching described directional control valve, be switched on or switched off the straight-through oil duct between described valve body filler opening and valve body return opening, by switching described manual directional control valve, straight-through oil duct between the filler opening connecting described valve body filler opening and described guide proportion pressure valve or guide's direct acting pressure valve.
Further, the oil duct between the filler opening of described manual directional control valve and the control chamber of described directional control valve is also provided with damping.
For achieving the above object, the utility model additionally provides a kind of hydraulic system, comprises pump, hydraulic oil container and executive component, wherein, also comprises aforesaid pressure controlled valve group.
For achieving the above object, the utility model additionally provides a kind of engineering mechanical device, comprises aforesaid hydraulic system, or comprises aforesaid pressure controlled valve group.
Based on technique scheme, pressure controlled valve group of the present utility model have employed the guide proportion pressure valve that can set multiple preset pressure by applying size of current, compared to existing pressure controlled valve group, the utility model can realize the control of multistage pressure on the basis using less element, only need to be electrically connected guide proportion pressure valve simultaneously, avoid the misconnection problem that existing pressure controlled valve group easily produces, and pressure adjusting point is less than existing pressure controlled valve group, therefore improve the debugging efficiency of pressure adjusting operation, save debug time.
In another embodiment, the utility model pressure controlled valve group also comprises: based on guide's direct acting pressure valve of spring force determination preset pressure with by switching the manual directional control valve changing described directional control valve Controlled vocabulary, under the different switching states of described manual directional control valve, switching in of described directional control valve is controlled by the preset pressure of described guide proportion pressure valve and the height relation of described system pressure, and is controlled by between the preset pressure of guide's direct acting pressure valve and the height relation of described system pressure and selects a selection.Wherein guide's direct acting pressure valve only can set a preset pressure, its effect is when guide's proportional pressure valve lost efficacy or electrical control was lost efficacy, can the switching of manually directional control valve the pressure on directional control valve spool be made to switch to guide's direct acting pressure valve, realize the Emergency use of system, or for fault verification.
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:
Fig. 1 is the schematic diagram of the pressure control circuit of existing system for hydraulic system of truck crane.
Fig. 2 is the Hydraulic System Principle schematic diagram of the embodiment adopting the utility model pressure controlled valve group.
Fig. 3 is the Hydraulic System Principle schematic diagram of another embodiment adopting the utility model pressure controlled valve group.
Embodiment
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
As shown in Figure 2, for adopting the Hydraulic System Principle schematic diagram of an embodiment of the utility model pressure controlled valve group.Pump 1, hydraulic oil container 8 and executive component 2 (linear oil cylinder such as shown in Fig. 2) is included in the hydraulic system of Fig. 2.Part wherein in Fig. 2 corresponding to double dot dash line is pressure controlled valve group embodiment of the present utility model.At least comprise in this pressure controlled valve group: guide proportion pressure valve 3 and directional control valve 6.Wherein, guide proportion pressure valve 3 can based on being applied in electric current determination preset pressure, the setting of multistage preset pressure just can be realized by the electric current electromagnet in guide proportion pressure valve being applied to different size, than many groups guide direct acting pressure valve that the existing pressure controlled valve group shown in Fig. 1 uses, save number of elements, and the requirement of multistage preset pressure can be adapted to; From electrical control and pressure adjusting aspect, this pressure controlled valve group only needs an electrical control point, without the need to needing 3 electrical control points and 4 pressure adjusting points as existing pressure controlled valve group, therefore the misconnection problem that existing pressure controlled valve group easily produces can be avoided, also can improve the debugging efficiency of pressure adjusting operation, save debug time.Guide proportion pressure valve can select the various control valve by Current adjustment preset pressure, such as proportional pressure control valve etc.Guide proportion pressure valve can select preset pressure with being applied in the increase of electric current and the type increased, such guide proportion pressure valve can at the situation of the guide's proportional pressure valve dead electricity (executive component such as corresponding to this pressure controlled valve group of not enabled, or there is the system failure) under maintain the oil return of low system pressure, reduce the problem of fluid heating.Guide proportion pressure valve also can select preset pressure with being applied in the increase of electric current and the type reduced, and can maintain maximum preset pressure, meet the need of work of executive component under the state of dead electricity.
Directional control valve 6 comprises switchable at least two working positions, can open system oil return oil circuit by being switched at least one working position for the hydraulic system that pressure controlled valve group is applied.The switching of directional control valve 6 is then controlled by the preset pressure of guide proportion pressure valve 3 and the height relation of system pressure.For the hydraulic system shown in Fig. 2, if system pressure is in a less numerical value, then directional control valve 6 is in the state of cut out under the effect of guide's proportional pressure valve 3 and self spring, now hydraulic system is not by directional control valve 6 oil return, when system pressure reaches a larger numerical value, when can mate with the preset pressure of guide proportion pressure valve 3, now system pressure exceedes the inlet pressure of guide proportion pressure valve and the active force of self spring of directional control valve 6, then pushing direction valve 6 is switched to another working position, open system oil return, hydraulic oil in such hydraulic system just flows back to hydraulic oil container 8 by the passage in directional control valve 6.Directional control valve can select the various control valve that can switch different operating position, such as stop valve or selector valve etc.
Here the Controlled vocabulary of indication not only simply compares the preset pressure of guide proportion pressure valve 3 and the numerical values recited of system pressure, if directional control valve self is not with spring, then directly can compare both numerical values recited; If directional control valve self is with spring, then also need the factor of the active force considering spring.
Pressure controlled valve group manufacture formal, inside can be adopted to be provided with the valve body of many oil ducts, and guide proportion pressure valve 3 and directional control valve 6 are each other, and be communicated with by the oil duct in valve body between the hydraulic system to apply with pressure controlled valve group, and do not adopt valve body external streams to circulate, the flow path of overflow can be made so more smooth and easy, reduce system relief power loss, and then the problem avoiding the power lost to cause hydraulic oil heating rotten.
Guide proportion pressure valve 3 and directional control valve 6 all can adopt screw-in cartridge valve, screw in valve body by valve member, it is more convenient that the selection of this valve arrangement form and installation form makes valve inner stream recirculates realize, the spatial volume that simultaneously pressure controlled valve group also can be made to take and weight significantly reduce, and also reduce cost accordingly.
The detailed description concrete structure of pressure controlled valve group of the present embodiment and the connected relation of inside is once carried out below in conjunction with Fig. 2.Wherein, valve body has valve body oil inlet P and valve body oil return inlet T (can be more than), directional control valve 6 has filler opening, the left and right control chamber A at return opening and spool two ends, B, guide proportion pressure valve 3 has filler opening C and return opening, the filler opening of directional control valve 6 and return opening communicate with valve body oil inlet P and valve body oil return inlet T respectively, left control chamber A and the right control chamber B of directional control valve 6 communicate with the filler opening C of valve body oil inlet P and guide proportion pressure valve 3 respectively, the return opening of guide proportion pressure valve 3 communicates with valve body oil return inlet T, oil duct between the filler opening C of guide proportion pressure valve 3 and valve body oil inlet P is provided with damping 7, by switching direction valve 6, the straight-through oil duct between valve body oil inlet P and valve body oil return inlet T can be switched on or switched off.
From figure, valve body oil inlet P has been communicated with the left control chamber A of directional control valve 6 and right control chamber B respectively, the oil circuit of itself and right control chamber B is provided with damping 7, an effect of damping 7 is the pressure reduction of formation two control chambers, to enable the move under influence of spool at pressure reduction of directional control valve 6, another effect is the flow system flow controlling to enter the less guide proportion pressure valve 3 of latus rectum.Oil duct between the filler opening C and the right control chamber B of directional control valve 6 of guide's proportional pressure valve 3 also can arrange damping 9, and the effect of this damping 9 makes directional control valve 6 switching action more steady, avoids system to produce compression shock.
Suppose that executive component 2 is for the linear oil cylinder shown in Fig. 2, the oil outlet of pump 1 is communicated to the large chamber of this linear oil cylinder, stretched out to the right by the piston rod promoting linear oil cylinder to large chamber fuel feeding, and the loculus of linear oil cylinder is received on oil return circuit, the fluid in the process loculus stretched out to the right along with piston rod flows back to hydraulic oil container 8.The utility model pressure controlled valve group is embodiment be just arranged between oil feeding line and oil return circuit, when not enabled linear oil cylinder, power without the need to giving guide proportion pressure valve 3, now the preset pressure of guide proportion pressure valve 3 is in fact very little or be 0, therefore the pressure of the left control chamber A of directional control valve 6 is greater than pressure and the spring force of right control chamber B, therefore directional control valve 6 is now opened, and the hydraulic oil that pump 1 exports can pass through directional control valve 6 oil return.And when enabling this linear oil cylinder, need to be provided with specific current value to guide proportion pressure valve 3, to set the preset pressure of guide proportion pressure valve 3.In piston rod movement process, system pressure is the induced pressure of executive component 2, do not reach the preset pressure of guide proportion pressure valve 3, now directional control valve 6 is in closed condition, after piston rod runs to the position of the rightmost side, system pressure starts accumulation, when reaching the preset pressure of guide proportion pressure valve 3, open the oil return of guide proportion pressure valve 3, thus make the pressure drop of the right control chamber B of directional control valve 6, when causing the system pressure of the left control chamber A of directional control valve 6 to exceed pressure and the spring force sum of the right control chamber B be communicated with at the filler opening of guide's proportional pressure valve 3, under the effect of system pressure, the spool of pushing direction valve 6 is switched to the state of directional control valve 6 conducting, the oil-feed oil circuit of hydraulic system is by directional control valve 6 directly oil return.
As shown in Figure 3, for adopting the Hydraulic System Principle schematic diagram of another embodiment of the utility model pressure controlled valve group.Compared with a upper embodiment, the pressure controlled valve group of the present embodiment also comprises: guide's direct acting pressure valve 5 and manual directional control valve 4.Wherein, guide's direct acting pressure valve determines preset pressure based on spring force, this preset pressure is determined, manual directional control valve 4 is then by switching the Controlled vocabulary changing directional control valve 6, manual directional control valve 4 also has can at least two working positions of manual switchover, corresponding to different switching states, under a kind of switching state, the switching of directional control valve 6 is controlled by the preset pressure of guide proportion pressure valve 3 and the height relation of system pressure, under another kind of switching state, the switching of directional control valve 6 is controlled by the preset pressure of guide's direct acting pressure valve 5 and the height relation of system pressure.
In the present embodiment, guide's direct acting pressure valve 5 only can set a preset pressure, its effect is when guide's proportional pressure valve 3 lost efficacy or electrical control was lost efficacy, can the switching of manually directional control valve 4 pressure on the spool of directional control valve 6 be made to switch to guide's direct acting pressure valve, realize the Emergency use of system, or for fault verification.
Accordingly, the pressure controlled valve group of the present embodiment also can be provided with the valve body realization of many oil ducts by inside, guide proportion pressure valve 3, directional control valve 6, guide's direct acting pressure valve 5 and manual directional control valve 4 are each other, and can be communicated with by the oil duct in valve body between the hydraulic system to apply with pressure controlled valve group, and do not adopt valve body external streams to circulate, the flow path of overflow can be made so more smooth and easy, reduction system relief power loss, and then the problem avoiding the power lost to cause hydraulic oil heating rotten.
And guide proportion pressure valve, directional control valve, guide's direct acting pressure valve and manual directional control valve all can adopt screw-in cartridge valve, described valve body is screwed into by valve member, more convenient to make valve inner stream recirculates realize, the spatial volume that simultaneously pressure controlled valve group also can be made to take and weight significantly reduce, and also reduce cost accordingly.
In the specific implementation structure of the present embodiment, with reference to figure 3.Valve body has valve body oil inlet P and valve body oil return inlet T, directional control valve 6 has filler opening, the left and right control chamber A at return opening and spool two ends, B, guide proportion pressure valve 3 and guide's direct acting pressure valve 5 all have filler opening C, D and return opening, manual directional control valve 4 has filler opening, return opening and an actuator port, the filler opening of directional control valve 6 and return opening communicate with valve body oil inlet P and valve body oil return inlet T respectively, left control chamber A and the right control chamber B of directional control valve 6 communicate with the filler opening of valve body oil inlet P and manual directional control valve 4 respectively, the return opening of guide proportion pressure valve 3 and guide's direct acting pressure valve 5 all communicates with valve body oil return inlet T (a more than valve body oil return inlet T), the filler opening C of guide proportion the pressure valve 3 and filler opening D of guide's direct acting pressure valve 5 communicates with the return opening of manual directional control valve 4 and actuator port respectively, oil duct between the filler opening of manual directional control valve 4 and valve body oil inlet P is provided with damping 7, by switching direction valve 6, be switched on or switched off the straight-through oil duct between valve body oil inlet P and valve body oil return inlet T, by switching manual directional control valve 4, connect the straight-through oil duct between valve body oil inlet P and the filler opening C of guide proportion the pressure valve 3 or filler opening D of guide's direct acting pressure valve 5.
From figure, valve body oil inlet P has been communicated with the left control chamber A of directional control valve 6 and right control chamber B respectively, the oil circuit of itself and right control chamber B is provided with damping 7, an effect of damping 7 is the pressure reduction of formation two control chambers, to enable the move under influence of spool at pressure reduction of directional control valve 6, another effect is the flow system flow controlling to enter the less guide proportion pressure valve 3 of latus rectum, guide's direct acting pressure valve 5 and manual directional control valve 4.Oil duct between the filler opening and the right control chamber B of directional control valve of manual directional control valve 4 can also arrange damping 9.The effect of this damping 9 makes directional control valve 6 switching action more steady, avoids system to produce compression shock.
The main working process of the present embodiment can with reference to a upper embodiment, when guide's proportional control valve 3 breaks down, in order to the pressure of hydraulic control internal system, operator can carry out emergency operation, under system pressure being switched to the control of guide's direct acting pressure valve 5 by the manual directional control valve 4 of manually-operable.
The utility model above-mentioned pressure controlled valve group embodiment is applicable to various needs and carries out pressure controlled hydraulic system, and these hydraulic systems comprise pump, hydraulic oil container and executive component, and pressure controlled valve group.The utility model above-mentioned pressure controlled valve group embodiment is also applicable to the pressure controlled engineering mechanical device of all kinds of needs, and such as truck crane, cement pump truck etc., above-mentioned hydraulic system also goes for the pressure controlled engineering mechanical device of all kinds of needs.
When introducing the element of each side of the present utility model or embodiment, article " ", " one ", " being somebody's turn to do " and " described " are intended to represent that to deposit in the component one or more.Term " comprises ", " comprising " and " having " mean comprising property, and represent other element that can to exist except listing element.
Describe in detail the exemplary embodiment of pressure controlled valve group, hydraulic system and engineering mechanical device above.But this pressure controlled valve group, hydraulic system and engineering mechanical device are not limited to specific embodiment as herein described, on the contrary, this valve group, system and/or equipment component can with other component as herein described independently and use dividually.In addition, described component also can be limited in other system, method and/or equipment, maybe can use in conjunction with it, and be not limited to only utilize pressure controlled valve group as herein described, hydraulic system and engineering mechanical device to implement.
This written explanation employs the example that comprises optimal mode to open the utility model, and also enables those skilled in the art to implement the utility model, comprises and makes and use any device or system, and perform the method for any combination.The scope of the claims of the present utility model limited by claim, and can comprise other example that those of ordinary skill in the art conceive.If these other examples there is no different from the written language in claim, if or these other examples comprise and the equivalent structural elements of the written language of claim without substantive difference, then will mean that such example is within the scope of claim.
Claims (12)
1. a pressure controlled valve group, it is characterized in that, comprise: based on being applied in the guide proportion pressure valve of electric current determination preset pressure and being opened the directional control valve of system oil return oil circuit by the hydraulic system switching to described pressure controlled valve group to apply, the switching of described directional control valve is controlled by the preset pressure of described guide proportion pressure valve and the height relation of described system pressure.
2. pressure controlled valve group according to claim 1, it is characterized in that, also comprise: based on guide's direct acting pressure valve of spring force determination preset pressure with by switching the manual directional control valve changing described directional control valve Controlled vocabulary, under the different switching states of described manual directional control valve, switching in of described directional control valve is controlled by the preset pressure of described guide proportion pressure valve and the height relation of described system pressure, and is controlled by between the preset pressure of guide's direct acting pressure valve and the height relation of described system pressure and selects a selection.
3. pressure controlled valve group according to claim 1, it is characterized in that, comprise the valve body that inside is provided with many oil ducts, described guide proportion pressure valve and directional control valve each other, and are communicated with by the oil duct in described valve body between the hydraulic system applied with described pressure controlled valve group.
4. pressure controlled valve group according to claim 3, is characterized in that, described guide proportion pressure valve and directional control valve are screw-in cartridge valve, screw into described valve body by valve member.
5. the pressure controlled valve group according to claim 3 or 4, it is characterized in that, described valve body has valve body filler opening and valve body return opening, described directional control valve has filler opening, the left and right control chamber at return opening and spool two ends, described guide proportion pressure valve has filler opening and return opening, the filler opening of described directional control valve and return opening communicate with described valve body filler opening and valve body return opening respectively, the left and right control chamber of described directional control valve communicates with the filler opening of described valve body filler opening and described guide proportion pressure valve respectively, the return opening of described guide proportion pressure valve communicates with described valve body return opening, oil duct between the filler opening of described guide proportion pressure valve and described valve body filler opening is provided with damping, by switching described directional control valve, be switched on or switched off the straight-through oil duct between described valve body filler opening and valve body return opening.
6. pressure controlled valve group according to claim 5, is characterized in that, the oil duct between the filler opening of described guide proportion pressure valve and the control chamber of described directional control valve is also provided with damping.
7. pressure controlled valve group according to claim 2, it is characterized in that, comprise the valve body that inside is provided with many oil ducts, described guide proportion pressure valve, directional control valve, guide's direct acting pressure valve and manual directional control valve each other, and are communicated with by the oil duct in described valve body between the hydraulic system applied with described pressure controlled valve group.
8. pressure controlled valve group according to claim 7, is characterized in that, described guide proportion pressure valve, directional control valve, guide's direct acting pressure valve and manual directional control valve are screw-in cartridge valve, screw into described valve body by valve member.
9. the pressure controlled valve group according to claim 7 or 8, it is characterized in that, described valve body has valve body filler opening and valve body return opening, described directional control valve has filler opening, the left and right control chamber at return opening and spool two ends, described guide proportion pressure valve and guide's direct acting pressure valve all have filler opening and return opening, described manual directional control valve has filler opening, return opening and an actuator port, the filler opening of described directional control valve and return opening communicate with described valve body filler opening and valve body return opening respectively, the left and right control chamber of described directional control valve communicates with the filler opening of described valve body filler opening and described manual directional control valve respectively, the return opening of described guide proportion pressure valve and guide's direct acting pressure valve all communicates with described valve body return opening, the filler opening of described guide proportion pressure valve and guide's direct acting pressure valve communicates with the return opening of described manual directional control valve and actuator port respectively, oil duct between the filler opening of described manual directional control valve and described valve body filler opening is provided with damping, by switching described directional control valve, be switched on or switched off the straight-through oil duct between described valve body filler opening and valve body return opening, by switching described manual directional control valve, straight-through oil duct between the filler opening connecting described valve body filler opening and described guide proportion pressure valve or guide's direct acting pressure valve.
10. pressure controlled valve group according to claim 9, is characterized in that, the oil duct between the filler opening of described manual directional control valve and the control chamber of described directional control valve is also provided with damping.
11. 1 kinds of hydraulic systems, comprise pump, hydraulic oil container and executive component, it is characterized in that, also comprise the arbitrary described pressure controlled valve group of claim 1 ~ 10.
12. 1 kinds of engineering mechanical devices, is characterized in that, comprise hydraulic system according to claim 11, or comprise the arbitrary described pressure controlled valve group of claim 1 ~ 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420306740.3U CN204284049U (en) | 2014-06-11 | 2014-06-11 | Pressure controlled valve group, hydraulic system and engineering mechanical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420306740.3U CN204284049U (en) | 2014-06-11 | 2014-06-11 | Pressure controlled valve group, hydraulic system and engineering mechanical device |
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| CN204284049U true CN204284049U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420306740.3U Withdrawn - After Issue CN204284049U (en) | 2014-06-11 | 2014-06-11 | Pressure controlled valve group, hydraulic system and engineering mechanical device |
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| CN (1) | CN204284049U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019073A (en) * | 2014-06-11 | 2014-09-03 | 徐州重型机械有限公司 | Pressure control valve set, hydraulic system and engineering mechanical equipment |
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2014
- 2014-06-11 CN CN201420306740.3U patent/CN204284049U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019073A (en) * | 2014-06-11 | 2014-09-03 | 徐州重型机械有限公司 | Pressure control valve set, hydraulic system and engineering mechanical equipment |
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