Summary of the invention
In order to overcome the deficiency of existing control oil channel form, the disclosed balanced type load feedback of the utility model multiple directional control valve group adopts the balanced type load feedback valve that will improve after designing directly to be integrated in the commutation valve body, combine together with original commutation function, constitute balanced type load feedback control oil channel and have the function of Pilot operated check valve.
The utility model is specifically by the following technical solutions:
A kind of balanced type load feedback multiple directional control valve group, it is that balanced type load feedback valve directly is integrated in the commutation valve body, combines together with the commutation valve body, constitutes balanced type load feedback control oil channel.The valve body of described balanced type load feedback multiple directional control valve group has top main aperture and bottom main aperture, and slide valve assembly is contained in the main aperture of bottom, and is sealed at both ends; Balanced type load feedback valve is contained in the top main aperture of valve body, and is sealed at both ends; On the bi-side of described valve body, have public oil inlet hole, special pressure oilhole, public spill port and be connected screw; The oil duct of commutation position communicates with the advancing of balanced type load feedback valve, oil circuit respectively in the valve body; Valve body top has actuator port, is connected with the hydraulic actuator of being controlled.
By handling reversing slide valve realization oil circuit conversion and the adjusting of operating cylinder or elevator oil hydraulic motor rising or falling speed being controlled.Owing to have the hydraulic control overload protection function; guaranteed the sealing of the driving fit line between one-way valve under the effect of the spring of unblanking and mobile valve pocket when multiple directional control valve is in the neutral position; closed the oil back chamber that connects operating cylinder or elevator oil hydraulic motor, operating cylinder or elevator oil hydraulic motor can not glide voluntarily under the rated load effect.When surpassing rated load, return pressure acts on and overcomes the spring pressure of unblanking on the useful area of mobile valve pocket and make the driving fit line crack, eliminates the overload factor under the situation of slow speed limit, guarantees the Security of complete machine; When producing hydraulic shock, driving fit line moment opens, and eliminates the surge pressure peak value, guarantees hydraulic system safety.
This multiple directional control valve group have delicate structure, configuration rationally, feedback is sensitive, volume is little, in light weight, it is convenient to safeguard, can realize that the step-less adjustment of movement velocity, control accuracy are higher, easy for installation, the advantage of applied range.
1, defectives such as to add inconvenience and volume that equilibrium valve brings big, and the pipeline connection reliability is poor, and feedback sensitivity lags behind, and installation conditions is limited have been changed;
2, changed original multiple directional control valve because of there being intrinsic leakage-gap, when reversing slide valve was in the neutral position, rated load can glide voluntarily, and operating mode is caused security risk and the relatively poor defective of speed governing sensitivity.
This balanced type load feedback multiple directional control valve group can be widely used in truck crane, truck-mounted crane, pile pressing machine, high-altitude operation vehicle, fork truck, refuse collection vehicle and other place that need carry out rising or falling speed control to the hydraulic actuator of vertical motion or oblique movement and need overload protection.
Description of drawings
Figure 1 shows that hydraulic work schematic diagram of the present utility model;
Figure 2 shows that the longitudinal section tectonic maps of bidirectional balanced formula load feedback multiple directional control valve group example of the present utility model.
Wherein, 1-guiding valve, 2-support, the 3-valve body, 4-first screw plug, 18-second screw plug, 5-first one-way valve, 17-second one-way valve, 6 first moves valve pocket, and 16-second moves valve pocket, and 7-first is valve pocket fixedly, 15-second is valve pocket fixedly, 8-first check valve spring, 14-second check valve spring, 9-first collar, 13-second collar, 10-first spring of unblanking, 12-second unblank spring, the two-way joint of 11-, 19-baffle plate, 20-end cap, 21-Returnning spring, 22-spring seat, 23-locating column.
Embodiment
According to Figure of description the technical solution of the utility model is described in further detail below.
Referring to Fig. 2, the valve body 3 of this bidirectional balanced formula load feedback multiple directional control valve group has top main aperture and bottom main aperture, and slide valve assembly is contained in the main aperture of bottom, and balanced type load feedback valve is contained in the top main aperture of valve body.Wherein the assembling of slide valve assembly is to utilize the outside thread of locating column 23 that spring seat 22, Returnning spring 21 are connected as one with the internal thread of guiding valve 1, and in the bottom main aperture of the valve body 3 of packing into, two ends are loaded onto end cap 20 and support 2 respectively, and the Sealing of packing into.The main dress of balanced type load feedback valve is: first fixedly valve pocket 7 and second fixedly the endoporus of valve pocket 15 be respectively charged into first and move valve pocket 6 and second and move valve pocket 16, move in the endoporus that valve pocket 6 and second moves valve pocket 16 first and to reinstall first one-way valve 5 and second one-way valve 17, be respectively charged into first check valve spring 8 and second one-way valve 14 again, and be separately fixed on first one-way valve 5 and second one-way valve 17 with collar, be respectively charged into first spring 10 and second spring 12 of unblanking of unblanking again, first the unblank end of spring 12 of spring 10 and second of unblanking is against first respectively and moves valve pocket 6 and second and move on the valve pocket 16, the other end is against respectively on the two-way joint 11, the two ends outside thread of two-way joint 11 respectively with first fixedly valve pocket 7 and second fixedly the internal thread of valve pocket 15 connect as one, in the top main aperture of the whole valve body 3 of packing into, two ends are loaded onto first screw plug 4 and second screw plug 18 and the Sealing of packing into respectively then.On the bi-side of valve body 3, have public oil inlet hole, special pressure oilhole, public spill port, connect screw, with realize the combination between the valve body and publicly advance, transmission and the introducing of this valve group pressure oil and the drainage of oil return of drainback passage.In the valve body lower portion main aperture, be designed to the arrangement of nine slot type oil ducts, to realize the commutation function of multiple slide valve function.The oil duct of commutation position in the valve body is communicated with the advancing of balanced type load feedback valve, oil circuit respectively, to realize balanced type load feedback function.Valve body top has actuator port, with realize with the hydraulic actuator of being controlled between be connected.
In conjunction with Fig. 1 and Fig. 2, when reversing slide valve 1 moves right, pressure oil is crossed second channel T2 from the logical T1 of first passage and is entered third channel T3 and promote first one-way valve, 5 compressions, first spring 8 and form opening to left movement, and pressure oil enters oil cylinder rodless cavity through four-way T4 and left end actuator port A.The cylinder rod chamber oil return enters the five-way road through right-hand member actuator port B, its return pressure acts on the end face of second one-way valve 17, promote second one-way valve 17 and drive second to move valve pocket 16 compression second check valve springs 14 and second spring 12 of unblanking and move to the end left, make second to move valve pocket 16 and second and fixedly form the gap between the valve pocket 15.While five-way road T5 return pressure acts on second and moves on the effective push area of valve pocket 16 and 17 driving fits place of second one-way valve, entering second with third channel T3 pressure oil by the tenth passage T10 through first one-way valve, 5 endoporus and two-way joint oil duct moves in valve pocket 16 and second gap that fixedly valve pocket 15 forms, utilize thrust that the second front-back product moment that moves valve pocket 16 produces and making a concerted effort of forming, promoting second moves valve pocket 16 compressions second spring 12 of unblanking and continues left to move, second driving fit place of moving the valve pocket 16 and second one-way valve 17 is thrown off form opening, the cylinder rod chamber oil return enters valve body the 8th passage T8 oil return by this open channels through the reversing slide valve opening, realizes the oil cylinder upstroke.When five-way road T5 return pressure increases, to third channel T3 working pressure is increased by load feedback, second move valve pocket 16 compression second unblank spring 12 make a concerted effort increase, the second driving fit place opening that moves the valve pocket 16 and second one-way valve 17 is strengthened, thereby return oil pressure is reduced, and the oil cylinder movement velocity is accelerated.When compression second unblank spring 12 make a concerted effort to reduce the time, second moves valve pocket 16 unblanks under the thrust of spring 12 to reduce with the driving fit place opening of second one-way valve 17 second, the oil cylinder movement velocity reduces.Can regulate the opening of oil inlet and oil return flow by the move distance of handling reversing slide valve, five-way road T5, four-way T4 oil inlet and oil return pressure are changed, make to act on second and move changing with second equilibrium of forces of unblanking spring 12 with joint efforts on the valve pocket 16, be implemented under the load behavior stepless speed regulation oil cylinder upstroke speed.
When reversing slide valve is moved to the left, pressure oil is crossed the 7th passage T7 from the logical T1 of first passage and is entered the 8th passage T8 and promote second one-way valve, 17 compressions second spring 12 of unblanking and move right the formation opening, and pressure oil enters cylinder rod chamber through five-way road T5 and right-hand member actuator port B.The oil cylinder rodless cavity oil return enters four-way T4 by left end actuator port A, its return pressure acts on the end face of first one-way valve 5, promote first one-way valve 5 and drive first to move valve pocket 6 compression first check valve springs 14 and first spring 10 of unblanking and move right on earth, make first to move valve pocket 6 and first and fixedly form the gap between the valve pocket 7.While four-way T4 return pressure acts on first and moves on the effective push area of valve pocket 6 and 5 driving fits place of first one-way valve, entering first with the 6th passage T6 pressure oil by the 11 passage T11 through second one-way valve, 17 endoporus and two-way joint 11 moves in valve pocket 6 and first gap that fixedly valve pocket 7 forms, utilize thrust that the first front-back product moment that moves valve pocket 6 produces and making a concerted effort of forming, promoting first moves valve pocket 6 compressions first spring 10 of unblanking and continues to the right to move, first driving fit place of moving the valve pocket 6 and first one-way valve 5 is thrown off form opening, the oil cylinder rodless cavity oil return enters valve body the 9th passage T chamber oil return by this open channels through the reversing slide valve opening, realizes the oil cylinder downward movement.When four-way T4 return pressure increases, six passage T6 increase working pressure by load feedback to the, first move valve pocket 6 compression first unblank spring 10 make a concerted effort increase, the first driving fit place opening that moves the valve pocket 6 and first one-way valve 5 is strengthened, thereby return oil pressure is reduced, and the oil cylinder movement velocity is accelerated.When compression first unblank spring 10 make a concerted effort to reduce the time, first moves valve pocket 6 unblanks under the thrust of spring 10 to reduce with the driving fit place opening of first one-way valve 5 first, the oil cylinder movement velocity reduces.Can regulate the opening of oil inlet and oil return flow by the move distance of handling reversing slide valve, four-way T4, five-way road oil inlet and oil return pressure are changed, make to act on first and move changing with first equilibrium of forces of unblanking spring 10 with joint efforts on the valve pocket 6, be implemented under the load behavior stepless speed regulation oil cylinder downward movement speed.
Be illustrated in figure 2 as the longitudinal section tectonic maps of the disclosed bidirectional balanced formula load feedback multiple directional control valve group example of the utility model.
Form commutation function by guiding valve 1, support 2, valve body 3, locating column 23, Returnning spring 21, spring seat 22, end cap 20, O shape circle, dust ring, by the change in location between the flow path groove in sealed step on the guiding valve 1 and the valve body 3, realize to advance, the unlatching of oil return flow path direction or close; By valve body 3 and first and second fixedly valve pocket 7 and 15, first and second move valve pocket 6 and 16, first and second one-way valves 5 and 17, two-way joint 11, first and second check valve springs 8 and 14, the first and second balanced type load feedback function that spring 10 and 12, first and second screw plugs 4 and 18, O shape circle form of unblanking.By adjusting to commutation sliding valve movement distance, under the effect of control fluid, make and act on the equilibrium of forces that movement of valve puts and change by pressure feedback, make driving fit line between one-way valve and the mobile valve pocket produce the variation of openings of sizes or close fully, to realize the control of load movement speed and to guarantee the steady safe operation of load.
(reversing slide valve 1 oil inlet and oil return mouth under the effect of Returnning spring 21 is in closure state when multiple directional control valve is in the neutral position, pressure oil can not be to this valve group generation function), move driving fit line sealing between valve pocket 6 and 16 at first and second unblank first and second one-way valves 5 and 17 and first and second under the effect of spring 10 and 12, closed the oil back chamber that connects operating cylinder, operating cylinder can not glide voluntarily under the rated load effect.When surpassing rated load, return pressure acts on first and second and moves and overcome first and second spring forces of unblanking spring 10 and 12 on the useful area of valve pocket 6 and 16 and make the driving fit line crack, under the situation of slow speed limit, eliminate the overload factor, guarantee the Security of complete machine; When producing hydraulic shock, driving fit line moment opens, and eliminates the surge pressure peak value, guarantees security of system.
When multiple directional control valve is in the neutral position, for improving under the severe duty, because of causing oil cylinder, balanced type load feedback valve fault do not have the danger that control is glided fast, adopt O type reversing slide valve sealed step place to add the design of throttling groove, both guaranteed to be in unloading condition behind the one-way valve of balanced type load feedback valve, can when breaking down, balanced type load feedback valve guarantee that load low speed steadily descends, and eliminates safe hidden trouble again.