CN204099323U - Proportional multi-way valve, jib hydraulic control system and concrete mixer - Google Patents
Proportional multi-way valve, jib hydraulic control system and concrete mixer Download PDFInfo
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- CN204099323U CN204099323U CN201420454948.XU CN201420454948U CN204099323U CN 204099323 U CN204099323 U CN 204099323U CN 201420454948 U CN201420454948 U CN 201420454948U CN 204099323 U CN204099323 U CN 204099323U
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Abstract
The utility model relates to a kind of proportional multi-way valve, jib hydraulic control system and concrete mixer, proportional multi-way valve comprises first valve body, tail connection valve body and at least one the work connection valve body be arranged between described first valve body and tail connection valve body, it is characterized in that, reduction valve is provided with in described tail connection valve body, the entrance of described reduction valve is communicated with described main oil feeding line, the outlet of described reduction valve is communicated with the pilot control oil circuit of at least one main reversing valve joined in valve body that works described, pilot control oil is provided to the main reversing valve in each work connection valve body, realize electrichydraulic control.The reduction valve arranged during the utility model is joined by tail can save the configuration of external guide's oil pump for proportional multi-way valve, and avoid arranging guide structure in first as far as possible, and cause valve volume comparatively large, the problem of processed complex, thus the pilot control structure optimizing proportional multi-way valve.
Description
Technical field
The utility model relates to engineering machinery field, particularly relates to a kind of proportional multi-way valve, jib hydraulic control system and concrete mixer.
Background technique
Concrete mixer is special-purpose vehicle pumping mechanism and boom system are integrated on automobile chassis.And the boom system of concrete mixer is mainly used in concrete conveying and cloth, is namely controlled expansion and the gathering of jib by oil cylinder, coordinate the revolution of turntable, by concrete conveyance to building a little of specifying.
Proportional multi-way valve is the core parts of construction machinery hydraulic system, between pump and executive component.In the jib hydraulic control system of concrete mixer, have employed proportional multi-way valve at present more, and proportional multi-way valve often adopts Non-follow control to commutate or proportion electro-magnet electrichydraulic control commutation, make the change that the stroke of spool is proportional, so that the flow of accuracy-control system, thus jib can be launched by desirable speed.For the jib hydraulic control system that have employed load sensitive system; usually pressure-compensated valve can be utilized to play balanced load effect; make all valve rod inlet outlet pressure differentials equal; ensure that the work connection flow of proportional multi-way valve is only relevant with the stroke of this manipulation valve rod; operator easily controls its composite move by the hope of oneself, keeps the independence of each actuator motions.
In current proportional multi-way valve, guide structure has employing Non-follow control, hydraulic control, automatically controlled form, makes the change that the stroke of spool is proportional.Pilot control can adopt the mode of external pilot control oil, or in the first of valve body, guide structure is set, and then by the electrichydraulic control of guide, proportional control is carried out to spool stroke, but the mode of external pilot control oil needs to configure more oil hydraulic pump, and guide structure is set in first, valve volume then can be caused because of guide structure and multiple the coordinating of hydraulic element in first again comparatively large, process also more complicated.
In current load-sensitive proportional multi-way valve, during work connection work, pressure corresponding to A, B mouth of load is drawn by loaded work piece pressure from the different cooperation positions of valve body by spool, and feed back in system, the pressure of the work connection that compensating load is low, pressure reduction that main valve plug is imported and exported keeps constant, so make load flow and spool stroke proportional.Although pressure compensation valve arrangement can equally loaded, its respectively connection load feedback pressure be feed back to pressure-compensated valve one end by the cooperation position that spool, valve body are different, this can make spool, valve body structure very complicated, and then increases difficulty of processing.
Model utility content
The purpose of this utility model proposes a kind of proportional multi-way valve, jib hydraulic control system and concrete mixer, can the pilot control structure of optimized proportion multi-way valve.
For achieving the above object, the utility model provides a kind of proportional multi-way valve, comprise first valve body, tail connection valve body and be arranged at least one the work connection valve body between described first valve body and tail connection valve body, wherein, reduction valve is provided with in described tail connection valve body, the entrance of described reduction valve is communicated with described main oil feeding line, the outlet of described reduction valve is communicated with the pilot control oil circuit of at least one main reversing valve joined in valve body that works described, there is provided pilot control oil to the main reversing valve in each work connection valve body, realize electrichydraulic control.
Further, described work connection valve body comprises valve body body, be arranged on the intrinsic main reversing valve of described valve body, pressure-compensated valve and the first shuttle valve, described pressure-compensated valve carries out valve precompensation to described main reversing valve, described valve body body has valve body filler opening, valve body return opening and two load hydraulic fluid ports, two filler openings of described first shuttle valve are in the in running order lower input receiving the induced pressure of two load hydraulic fluid ports of described valve body body respectively of described work connection, the induced pressure filtered out is exported to the spring side control chamber of described pressure-compensated valve by the oil outlet of described first shuttle valve.
Further, described valve body body also has load-sensitive hydraulic fluid port and induced pressure inlet opening, the second shuttle valve is also provided with in described valve body body, a filler opening of described second shuttle valve receives the input of the oil outlet of described first shuttle valve, another filler opening receives the induced pressure from operated adjacent connection valve body by the input of described induced pressure inlet opening, and the induced pressure filtered out is outputted to described load-sensitive hydraulic fluid port by the oil outlet of described second shuttle valve.
Further, be also provided with two dampings in described valve body body, the induced pressure of two load hydraulic fluid ports of described valve body body inputs to two filler openings of described first shuttle valve respectively through described two dampings.
Further, two the first relief valves are also provided with in described valve body body, can at the in running order lower induced pressure limiting two load hydraulic fluid ports respectively of described work connection valve body, the import of described two the first relief valves is communicated with two filler openings of described first shuttle valve respectively, and outlet is all communicated with the valve body return opening of described valve body body.
Further, the valve body body of described first valve body is provided with the filler opening for connecting oil feeding line and the return opening for being connected oil return circuit, the valve body body of described first valve body is also provided with for the load-sensitive output oil port of pump variable control mechanism output loading sensitive pressure and the drain tap of described load-sensitive pressure, the second relief valve is also provided with in described first valve body, the import of described second relief valve is communicated with return opening with the filler opening on the valve body body of described first valve body respectively with outlet, the load-sensitive hydraulic fluid port that described load-sensitive output oil port and operated adjacent join valve body is communicated with, and be also provided with damping between the load-sensitive hydraulic fluid port joining valve body at described load-sensitive output oil port and operated adjacent, the drain tap of described load-sensitive pressure is communicated with the load-sensitive hydraulic fluid port that operated adjacent joins valve body by the solenoid directional control valve be arranged in described first valve body, and by the off-load of described solenoid directional control valve control load sensitive pressure.
Further, the load-sensitive output oil port place on the valve body body of described first valve body is also provided with dynamic antivibration.
Further, the 3rd relief valve is also provided with in described first valve body, the import of described 3rd relief valve is communicated with the return opening in the control port of described second relief valve and the valve body body of described first valve body respectively with outlet, is also provided with damping between the filler opening in the import of described 3rd relief valve and the valve body body of described first valve body.
Further, described work connection valve body is also provided with manual control knobs, realizes the Non-follow control of the main reversing valve in described work connection valve body.
Further, described first valve body, tail connection valve body and at least one work connection valve body are connected by stud nut, and between each valve body, arrange the O shape circle of sealing.
For achieving the above object, the utility model provides a kind of jib hydraulic control system, comprise the variable displacement pump assembly with pump control mechanism and hydraulic oil container, wherein, also comprise aforesaid proportional multi-way valve, each relevant executive component that described proportional multi-way valve is jib by the load hydraulic fluid port of each work connection valve body provides work fluid.
For achieving the above object, the utility model provides a kind of concrete mixer, comprises jib and executive component, wherein, also comprises aforesaid jib hydraulic control system.
Based on technique scheme, the utility model adds reduction valve in tail connection, reduction valve is utilized to carry out decompression to obtain satisfactory pilot control oil to the hydraulic oil carrying out autonomous oil feeding line, and pilot control oil is supplied to the main reversing valve of each work connection valve body, to realize electrichydraulic control function.The reduction valve arranged during the utility model is joined by tail can save the configuration of external guide's oil pump for proportional multi-way valve, and avoid arranging guide structure in first as far as possible, and cause valve volume comparatively large, the problem of processed complex, thus the pilot control structure optimizing proportional multi-way valve.
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 hydraulic principle schematic diagram of an embodiment of the utility model proportional multi-way valve.
Fig. 2 is the valve body form structure schematic diagram of the utility model proportional multi-way valve embodiment.
Fig. 3 is the form structure schematic diagram of an instantiation of tail connection valve body in the utility model proportional multi-way valve embodiment.
Fig. 4 is the internal galleries schematic diagram of an instantiation of first valve body in the utility model proportional multi-way valve embodiment.
Embodiment
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
As shown in Figure 1, be the hydraulic principle schematic diagram of an embodiment of the utility model proportional multi-way valve.Valve body form structure shown in composition graphs 2, the proportional multi-way valve in the present embodiment comprises first valve body 21, tail connection valve body 23 and is arranged at least one the work connection valve body 22 between first valve body 21 and tail connection valve body 23.In the present embodiment, tail connection valve body 23 not simple cover plate structure, but the reduction valve 14 that can provide pilot control oil is set in tail connection valve body, the entrance of reduction valve 14 is communicated with main oil feeding line, and the outlet of reduction valve 14 is communicated with the pilot control oil circuit of at least one main reversing valve 12 joined in valve body 22 that works, there is provided pilot control oil to the main reversing valve 12 in each work connection valve body 22, realize electrichydraulic control.
In above-mentioned tail connection structure, the pressure oil that pump 1 exports first arrives the entrance of the reduction valve 14 in tail connection valve body 23 through the oil duct of P1 hydraulic fluid port in each work connection valve body, through the decompression of reduction valve 14, the pilot control oil meeting the requirement of pilot control oil pressure after decompression is delivered to by tail connection valve body 23 and each work oil duct joined between valve body 22 pilot control opening that each work joins valve body 22 by outlet by reduction valve 14.And all can adoption rate reduction valve a, b coordinate the size of input current signal to carry out proportional control at the main reversing valve 12 of each work connection valve body 22, the stroke of the spool of main reversing valve 12 can with being in proportion of current signal, thus reach the proportional control hydraulic fluid flow rate by this main reversing valve 12.On tail connection valve body 23 except reduction valve 14 is set, the drain tap L of whole proportional multi-way valve, oil return inlet T 2 and external guide's hydraulic fluid port A0 etc. can also be set.
Installing at proportional pressure-reducing valve, can cover installation two proportional pressure-reducing valves a, b at the spring terminal of commutation connection valve body, and be in tilted layout.The internal galleries that pilot control oil can be covered by spring terminal arrives proportional pressure-reducing valve, and when proportional pressure-reducing valve no electric circuit, pressure oil ends.When proportional pressure-reducing valve is given electrical signal, control pilot control oil that can be proportional, thus the displacement of proportional control spool.In the layout of proportional pressure-reducing valve, two proportional pressure-reducing valves a, b can be arranged on proportional multi-way valve side, thus make structure compacter, be also convenient to electric wire on proportional pressure-reducing valve a, b and arrange.
As can see from Figure 1, the proportional multi-way valve of the present embodiment can have multiple work connection valve body corresponding to different executive components, such as, in Fig. 1, three executive components joining valve body corresponding respectively that work are oil cylinder 8,9,10, and the different application occasion of proportional multi-way valve according to the present embodiment, the induced pressure of the kind of executive component and number and correspondence requires to select as required, and each work connection valve body can adopt identical or close internal structure and principle.
For the work of oil cylinder in Fig. 19 correspondence connection valve body, this work connection valve body comprises valve body body, is arranged on the intrinsic main reversing valve 12 of valve body, pressure-compensated valve 17 and the first shuttle valve 16, pressure-compensated valve 17 can carry out valve precompensation to main reversing valve 12, make the front and back pressure reduction of main reversing valve 12 constant, and then it is only proportional with the stroke of the spool of main reversing valve 12 to make work join flow, and have nothing to do with load.And the valve body body of this work connection valve body has valve body filler opening, valve body return opening and two load hydraulic fluid ports A, B, two filler openings of the first shuttle valve 16 are in the in running order lower input receiving the induced pressure of two load hydraulic fluid ports A, B of valve body body respectively of work connection, and the induced pressure filtered out is exported to the spring side control chamber of pressure-compensated valve 17 by the oil outlet of the first shuttle valve 16.What the first shuttle valve 16 played is the pressure that relatively this work joins two load hydraulic fluid ports A, B of valve body structure, and take out and carry out compared with heavy load pressure the effect that exports, and export the spring side control chamber of larger induced pressure to pressure-compensated valve 17, pressure-compensated valve 17 two ends pressure reduction can be made to stablize, guarantee that the compensate function of pressure-compensated valve 17 is stablized, reduce to impact.
Mention existing work connection valve body structure above often to need to export corresponding loaded work piece pressure by spool from the different cooperation positions of valve body, such as when A mouth is in load condition at present, when needing to export A mouth induced pressure, spool is needed to move to special position, and the structure on spool will carry out coordinating and the induced pressure of A mouth can be drawn with the structure on valve body, and when B mouth is in load condition, spool is then needed again to move another special position, the cooperating structure of spool and valve body is utilized to draw the induced pressure of B mouth, in order to realize the extraction of above-mentioned certain loads pressure under certain working state, often need on valve body and spool, design complicated structure, thus add difficulty of processing.And by comparison, the pressure of two load hydraulic fluid ports is all drawn by the screening structure of the induced pressure of the first shuttle valve that the present embodiment adopts under work connection is in loaded state simultaneously, recycle the first shuttle valve to filter out larger the carrying out of induced pressure and export, the complexity that this function corresponds to the cooperating structure of spool and valve body is much lower, reduces difficulty of processing accordingly.
Except adopting except the mode and structure of single work connection valve body extraction induced pressure, shuttle valve network can also be adopted to be compared by each work connection valve body induced pressure of drawing, to filter out maximum induced pressure to be supplied to pump variable control mechanism as load-sensitive signal.For realizing this function, load-sensitive hydraulic fluid port and induced pressure inlet opening can be set on the body of each work connection valve body, accordingly, second shuttle valve 18 is set in valve body body, a filler opening of the second shuttle valve 18 receives the input of the oil outlet of the first shuttle valve 16, another filler opening receives and joins the induced pressure of valve body by what input from induced pressure inlet opening from operated adjacent, the oil outlet of the second shuttle valve 18 using the induced pressure that filters out as load-sensitive Output pressure to load-sensitive hydraulic fluid port.
As can see from Figure 1, the oil return circuit pressure of the second shuttle valve 18 to the maximum load pressure (the maximum load pressure of this connection A, B mouth namely filtered out by the first shuttle valve 16) of this connection and tail connection of leftmost work connection valve body compares, filter out maximum induced pressure and pass to the second shuttle valve 18 in the adjacent work connection in right side as load-sensitive pressure, compare by connection like this, the work connection in the rightmost side exports maximum load-sensitive pressure feeds back to pump 1 variable control mechanism through first.
In addition, two dampings are also provided with in the valve body body of work connection valve body, be respectively damping 15 and damping 19, correspond respectively to load hydraulic fluid port A, B, the induced pressure of load hydraulic fluid port A, B inputs to two filler openings of the first shuttle valve 16 respectively through damping 15 and damping 19.Damping 15 and damping 19 can cushion the compression shock from load hydraulic fluid port A, B.
In order to the spool that the limits main reversing valve 12 the highest system pressure when working position, left and right, two the first relief valves 13,11 can also be set in valve body body further, can at the in running order lower induced pressure limiting two load hydraulic fluid ports A, B respectively of work connection valve body, the import of two the first relief valves 13,11 is communicated with two filler openings of the first shuttle valve 16 respectively, and outlet is all communicated with the valve body return opening of valve body body.First relief valve 13,11 can join the difference of the load corresponding to valve body according to each work, set up different preset pressure.
For the main reversing valve 12 of middle work connection valve body embodiment illustrated in fig. 1, when spool is switched to the work of left position, the filler opening of work connection valve body is communicated with load hydraulic fluid port A, the hydraulic oil carrying out autonomous oil-feed oil circuit can enter into the rodless cavity of oil cylinder 9, and the return opening of work connection valve body is communicated with load hydraulic fluid port B, the hydraulic oil of the rod chamber of oil cylinder 9 will flow back to fuel tank by return opening, now load hydraulic fluid port A also by damping 15 respectively with a filler opening of the first shuttle valve 16 and the inlet communication of the first relief valve 13, and load hydraulic fluid port B by damping 19 respectively with another filler opening of the first shuttle valve 16 and the inlet communication of the first relief valve 11.And when spool is switched to the work of right position, the filler opening of work connection valve body is communicated with load hydraulic fluid port B, the hydraulic oil carrying out autonomous oil-feed oil circuit can enter into the rod chamber of oil cylinder 9, and the return opening of work connection valve body is communicated with load hydraulic fluid port A, the hydraulic oil of the rodless cavity of oil cylinder 9 will flow back to fuel tank by return opening, now load hydraulic fluid port A still by damping 15 respectively with a filler opening of the first shuttle valve 16 and the inlet communication of the first relief valve 13, and load hydraulic fluid port B still by damping 19 respectively with another filler opening of the first shuttle valve 16 and the inlet communication of the first relief valve 11.When the spool of main reversing valve 12 is in meta, load hydraulic fluid port A, B are all in the state of disconnection, and two filler openings of the first shuttle valve 16 are interconnected, and receive the return opening of valve body body, the load-sensitive pressure that now this work connection valve body exports is return pressure.
Composition graphs 1 carrys out illustratively first valve body 21 more below.The valve body body of first valve body 21 is provided with the oil inlet P 1 for connecting oil feeding line and the oil return inlet T 1 for being connected oil return circuit, the valve body body of first valve body 21 is also provided with for the load-sensitive output oil port LS of variable control mechanism output loading sensitive pressure of pump 1 and the drain tap of load-sensitive pressure, the drain tap L that this drain tap is joined on valve body by the oil duct in each valve body and tail communicates.The second relief valve 5 is also provided with in first valve body 21, the import of the second relief valve 5 is communicated with oil return inlet T 1 with the oil inlet P 1 on the valve body body of first valve body 21 respectively with outlet, the load-sensitive hydraulic fluid port that load-sensitive output oil port LS and operated adjacent join valve body is communicated with, and be also provided with damping 3 between the load-sensitive hydraulic fluid port joining valve body at load-sensitive output oil port LS and operated adjacent, the drain tap of load-sensitive pressure is communicated with the load-sensitive hydraulic fluid port that operated adjacent joins valve body by the solenoid directional control valve 7 be arranged in first valve body 21, and pass through the off-load of solenoid directional control valve 7 control load sensitive pressure.
In order to the change alleviating load-sensitive pressure causes the impact of the variable control mechanism to pump 1, dynamic antivibration 2 can be set the load-sensitive output oil port LS place on the valve body body of first valve body 21.In addition, can also arrange the 3rd relief valve 6 in first valve body, and be main relief valve with the second relief valve 5, the 3rd relief valve 6 is secondary relief valve.Wherein, the import of the 3rd relief valve 6 is communicated with the oil return inlet T 1 in the control port of the second relief valve 5 and the valve body body of first valve body 21 respectively with outlet, is also provided with damping 4 between the oil inlet P 1 in the import of the 3rd relief valve 6 and the valve body body of first valve body 21.
When pump 1 is input in first valve body 21 by the oil inlet P 1 of first valve body 21, the pressure of oil inlet P 1 connects the second relief valve 5, the pressure of oil inlet P 1 is by connecing the 3rd relief valve 6 after damping 4 simultaneously, by the 3rd relief valve 6 off-load, thus controlling the second relief valve 5 off-load, after off-load, hydraulic oil arrives oil return inlet T 1.The load-sensitive pressure (i.e. LS pressure) obtained from operated adjacent connection valve body is drawn through damping 3, dynamic antivibration 2, be connected to the control mouth of the variable control mechanism of pump 1, thus the displacement variation of control pump 1, pump 1 output flow is made to meet flow needed for system, and dynamic antivibration 2 pairs of LS compression shocks alleviate after guide to pump 1 again and control mouth, improve the stability of system and handling.On the other hand, LS pressure arrives solenoid directional control valve 7, by the off-load of the break-make control LS pressure of solenoid directional control valve 7.
With reference to figure 2, manual control knobs can also be set on work connection valve body 22, to realize the Non-follow control of the main reversing valve 12 in work connection valve body 22.The concrete structure of handle can comprise handle end cap, handle, handle set, axle, ball head connecting rod, push rod etc., and structure is simple, easy to operate, and also sealing is reliable.The quantity of work connection valve body can be determined according to the system requirements of practical application, and first valve body 21, tail connection valve body 23 and at least one work connection valve body 22 can be connected by stud nut, such as stud 24 one end is screwed in first valve body 21, one end is tightened by nut 25.The O shape circle of sealing can also be set between each adjacent valve body of first valve body 21, tail connection valve body 23 and each work connection valve body 22.
As shown in Figure 3, be the form structure schematic diagram of an instantiation of tail connection valve body in the utility model proportional multi-way valve embodiment.In the form structure of this tail connection valve body, the valve body body 41 of tail connection valve body has through hole 42,44,47, be used for stud is installed, and reduction valve 45 can be installed on the end face of tail connection valve body, pressure oil enters from the oil inlet P the valve body body 41 of tail connection valve body, after reduction valve 45, provide pilot pressure to each, reduction valve 45 can adopt cartridge valve structure.In figure 3 label be 43,46 element be plug on valve body body 41.
As shown in Figure 4, be the internal galleries schematic diagram of an instantiation of first valve body in the utility model proportional multi-way valve embodiment.The hydraulic schematic diagram of the first valve body on right side in composition graphs 1, can see that the pressure oil carrying out self-pumping 1 enters from oil inlet P 1, by spool 33 internal galleries of the second relief valve 5, arrive its left end, pressure oil arrives the right-hand member of main relief valve spool 33 with spring 35 side by damping 4 simultaneously, plug 36 plays the effect of spring end cap, simultaneously pressure oil arrives one end of the 3rd relief valve 6 through the internal galleries of the valve body body 32 of first valve body 21 from spool 33 right-hand member of the second relief valve 5, when pressure reaches the set pressure of the 3rd relief valve 6, pressure off-load, thus the second relief valve 5 off-load.The pressure oil simultaneously entered from oil inlet P 1 is drawn from the inside hydraulic fluid port of the valve body body 32 of first valve body 21, provides pressure oil to each work connection valve body.Oil return inlet T 1 is communicated with the return opening that each work joins valve body by the inside hydraulic fluid port of the valve body body 32 of first valve body 21.And LS pressure arrives solenoid directional control valve 7, commutated by solenoid directional control valve 7, control LS pressure carries out off-load.Solenoid directional control valve 7 also can adopt screw-in cartridge valve form.In the diagram label be 31,34 element be plug on valve body body 32.
Each embodiment of above-mentioned the utility model proportional multi-way valve can be applicable to all kinds of hydraulic control system, such as be applied in jib hydraulic control system, i.e. a kind of jib hydraulic control system, comprise the variable displacement pump assembly with pump control mechanism and hydraulic oil container, also comprise any one the embodiment of proportional multi-way valve noted earlier, and proportional multi-way valve provides work fluid by each relevant executive component that the load hydraulic fluid port of each work connection valve body is jib.This jib hydraulic control system also can be applicable to the engineering mechanical device of all kinds of use jib, such as concrete mixer, i.e. a kind of concrete mixer, comprises jib and executive component, also comprises aforesaid jib hydraulic control system.
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; 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 (12)
1. a proportional multi-way valve, comprise first valve body, tail connection valve body and be arranged at least one the work connection valve body between described first valve body and tail connection valve body, it is characterized in that, reduction valve is provided with in described tail connection valve body, the entrance of described reduction valve is communicated with described main oil feeding line, the outlet of described reduction valve is communicated with the pilot control oil circuit of at least one main reversing valve joined in valve body that works described, provides pilot control oil, realize electrichydraulic control to the main reversing valve in each work connection valve body.
2. proportional multi-way valve according to claim 1, it is characterized in that, described work connection valve body comprises valve body body, be arranged on the intrinsic main reversing valve of described valve body, pressure-compensated valve and the first shuttle valve, described pressure-compensated valve carries out valve precompensation to described main reversing valve, described valve body body has valve body filler opening, valve body return opening and two load hydraulic fluid ports, two filler openings of described first shuttle valve are in the in running order lower input receiving the induced pressure of two load hydraulic fluid ports of described valve body body respectively of described work connection, the induced pressure filtered out is exported to the spring side control chamber of described pressure-compensated valve by the oil outlet of described first shuttle valve.
3. proportional multi-way valve according to claim 2, it is characterized in that, described valve body body also has load-sensitive hydraulic fluid port and induced pressure inlet opening, the second shuttle valve is also provided with in described valve body body, a filler opening of described second shuttle valve receives the input of the oil outlet of described first shuttle valve, another filler opening receives the induced pressure from operated adjacent connection valve body by the input of described induced pressure inlet opening, and the induced pressure filtered out is outputted to described load-sensitive hydraulic fluid port by the oil outlet of described second shuttle valve.
4. the proportional multi-way valve according to Claims 2 or 3, it is characterized in that, in described valve body body, be also provided with two dampings, the induced pressure of two load hydraulic fluid ports of described valve body body inputs to two filler openings of described first shuttle valve respectively through described two dampings.
5. the proportional multi-way valve according to Claims 2 or 3, it is characterized in that, two the first relief valves are also provided with in described valve body body, can at the in running order lower induced pressure limiting two load hydraulic fluid ports respectively of described work connection valve body, the import of described two the first relief valves is communicated with two filler openings of described first shuttle valve respectively, and outlet is all communicated with the valve body return opening of described valve body body.
6. proportional multi-way valve according to claim 3, it is characterized in that, the valve body body of described first valve body is provided with the filler opening for connecting oil feeding line and the return opening for being connected oil return circuit, the valve body body of described first valve body is also provided with for the load-sensitive output oil port of pump variable control mechanism output loading sensitive pressure and the drain tap of described load-sensitive pressure, the second relief valve is also provided with in described first valve body, the import of described second relief valve is communicated with return opening with the filler opening on the valve body body of described first valve body respectively with outlet, the load-sensitive hydraulic fluid port that described load-sensitive output oil port and operated adjacent join valve body is communicated with, and be also provided with damping between the load-sensitive hydraulic fluid port joining valve body at described load-sensitive output oil port and operated adjacent, the drain tap of described load-sensitive pressure is communicated with the load-sensitive hydraulic fluid port that operated adjacent joins valve body by the solenoid directional control valve be arranged in described first valve body, and by the off-load of described solenoid directional control valve control load sensitive pressure.
7. proportional multi-way valve according to claim 6, is characterized in that, the load-sensitive output oil port place on the valve body body of described first valve body is also provided with dynamic antivibration.
8. proportional multi-way valve according to claim 6, it is characterized in that, the 3rd relief valve is also provided with in described first valve body, the import of described 3rd relief valve is communicated with the return opening in the control port of described second relief valve and the valve body body of described first valve body respectively with outlet, is also provided with damping between the filler opening in the import of described 3rd relief valve and the valve body body of described first valve body.
9. proportional multi-way valve according to claim 1, is characterized in that, described work connection valve body is also provided with manual control knobs, realizes the Non-follow control of the main reversing valve in described work connection valve body.
10. proportional multi-way valve according to claim 1, is characterized in that, described first valve body, tail connection valve body and at least one work connection valve body are connected by stud nut, and between each valve body, arrange the O shape circle of sealing.
11. 1 kinds of jib hydraulic control systems, comprise the variable displacement pump assembly with pump control mechanism and hydraulic oil container, it is characterized in that, also comprise the arbitrary described proportional multi-way valve of claim 1 ~ 10, each relevant executive component that described proportional multi-way valve is jib by the load hydraulic fluid port of each work connection valve body provides work fluid.
12. 1 kinds of concrete mixers, comprise jib and executive component, it is characterized in that, also comprise jib hydraulic control system according to claim 11.
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| CN201420454948.XU CN204099323U (en) | 2014-08-12 | 2014-08-12 | Proportional multi-way valve, jib hydraulic control system and concrete mixer |
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| CN201420454948.XU CN204099323U (en) | 2014-08-12 | 2014-08-12 | Proportional multi-way valve, jib hydraulic control system and concrete mixer |
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| CN105402180A (en) * | 2014-08-12 | 2016-03-16 | 徐工集团工程机械股份有限公司 | Proportion multi-way valve, cantilever crane hydraulic control system and concrete pump vehicle |
| CN106762916A (en) * | 2017-02-28 | 2017-05-31 | 徐工集团工程机械有限公司 | Work connection, load sensing multi-way valve and engineering machinery |
| CN107762995A (en) * | 2017-09-13 | 2018-03-06 | 江苏恒立液压科技有限公司 | Novel electric proportional overflow device |
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2014
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| CN105402180A (en) * | 2014-08-12 | 2016-03-16 | 徐工集团工程机械股份有限公司 | Proportion multi-way valve, cantilever crane hydraulic control system and concrete pump vehicle |
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| CN106762916A (en) * | 2017-02-28 | 2017-05-31 | 徐工集团工程机械有限公司 | Work connection, load sensing multi-way valve and engineering machinery |
| CN107762995A (en) * | 2017-09-13 | 2018-03-06 | 江苏恒立液压科技有限公司 | Novel electric proportional overflow device |
| CN107762995B (en) * | 2017-09-13 | 2023-12-22 | 江苏恒立液压科技有限公司 | Novel electric proportion overflow device |
| CN113464514A (en) * | 2021-07-30 | 2021-10-01 | 湖南三一中型起重机械有限公司 | Integrated electric control multi-way valve and crane |
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