CN102900716B - Feedback speed regulation device and engineering machinery - Google Patents

Feedback speed regulation device and engineering machinery Download PDF

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Publication number
CN102900716B
CN102900716B CN201210447208.9A CN201210447208A CN102900716B CN 102900716 B CN102900716 B CN 102900716B CN 201210447208 A CN201210447208 A CN 201210447208A CN 102900716 B CN102900716 B CN 102900716B
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valve
oil
pressure
pilot
feedback
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CN102900716A (en
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向治平
谭毅
潘文华
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CHANGDE ZHONGLIAN ZHONGKE HYDRAULIC Co Ltd
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CHANGDE ZHONGLIAN ZHONGKE HYDRAULIC Co Ltd
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Abstract

The invention provides a feedback speed regulation device and engineering machinery. The feedback speed regulation device comprises a reversing valve, a pressure-compensated valve, a speed control valve and a pilot control valve; an oil inlet is sequentially connected with the reversing valve and the pressure-compensated valve by virtue of a first oil way, and a first outlet of the pressure-compensated valve is connected with the reversing valve so as to cause the first outlet of the pressure-compensated valve to be connected with multiple working ports in a switchable manner by virtue of the reversing valve; the oil inlet is sequentially connected with the speed control valve and an oil return port by virtue of a second oil way; the pilot control valve controls load feedback pressure oil flowing into the control oil port of the speed control valve by virtue of the pilot control valve under the action of pressure oil of a second oil way and the load feedback pressure oil; and the aperture of the speed control valve is controlled by the pressure oil of the second oil way and the load feedback pressure oil from the pilot control valve. When the reversing valve is in a middle position, the pressure oil in the second oil way can open the speed control valve more easily, the power loss of a system is reduced, the heat productivity of the speed control valve is reduced, and a good energy-saving effect is achieved.

Description

Feedback arrangements for speed regulation and engineering machinery
Technical field
The present invention relates to Hydraulic Field, more specifically, relate to a kind of feedback arrangements for speed regulation and engineering machinery.
Background technique
Often load feedback arrangements for speed regulation can be used, to control the motion of actuator in engineering machinery (such as environmental sanitation machinery).
Fig. 1 shows the schematic diagram of feedback arrangements for speed regulation of the prior art.Fig. 2 shows the partial structurtes schematic diagram of the series flow control valve in Fig. 1.Fig. 3 shows the sectional view of selector valve in Fig. 1 and pressure-compensated valve.
As shown in Figure 1 to Figure 3, feedback arrangements for speed regulation of the prior art comprise oil inlet P, oil return inlet T, actuator port A, B and load feedback mouth LS.These feedback arrangements for speed regulation also comprise selector valve 10, pressure-compensated valve 20 and series flow control valve 30.Wherein, oil inlet P is connected with selector valve 10 and pressure-compensated valve 20 successively by the first oil circuit, first delivery outlet 21 of pressure-compensated valve 20 is connected with selector valve 10 to make the first delivery outlet 21 of pressure-compensated valve 20 switchably flow to actuator port A, B by selector valve 10, the second delivery outlet 22, second delivery outlet 22 that pressure-compensated valve 20 also comprises for output loading feedback pressure oil is connected with load feedback mouth LS.Oil inlet P is connected with series flow control valve 30 and oil return inlet T successively by the second oil circuit.In addition, feed back arrangements for speed regulation and also comprise flow stabilizer 60, relief valve 70 and one-way valve 80.
Please refer to Fig. 2 and Fig. 3, selector valve 10 comprises valve body 11 and valve rod 12.When valve rod 12 is positioned at meta, do not have pressure oil to flow to pressure-compensated valve 20, correspondingly, pressure-compensated valve 20 is not also to load feedback mouth LS output loading feedback pressure oil.Incorporated by reference to Fig. 3, the pressure oil of oil inlet P all flows to series flow control valve 30, and overcomes the elastic force of the elastic element 33 of series flow control valve 30, thus the valve rod 32 of series flow control valve 30 is moved, to open series flow control valve 30 to the left side of Fig. 3.Now, pump export flow after oil inlet P, through series flow control valve 30 and oil return inlet T oil return.In order to meet system when meta, the through-current capability of series flow control valve 30, the physical dimension of the valve rod 32 of series flow control valve 30 is larger, simultaneously in order to meet load variations larger time still can normally work, the rigidity of the elastic element 33 of series flow control valve 30 is comparatively large, and cause system power loss when meta large, heating is serious.
When the valve rod 12 promoting selector valve 10 is in open, the pressure oil of oil inlet P acts on the upper end of the valve rod 24 of pressure-compensated valve 20 after the restriction 13 of valve rod 12 produces a pressure drop, and overcome the spring force of the elastic element 23 of pressure-compensated valve 20, the valve rod 24 of pressure-compensated valve 20 is moved down.Like this, the pressure oil of oil inlet P just can be passed through actuator port A or B and flows into corresponding actuator.Now, induced pressure aperture on the valve rod 24 of pressure-compensated valve 20 pushes the lower end that steel ball 25 enters into the valve rod 24 of pressure-compensated valve 20 open, feed back to the left end of the valve rod 33 of series flow control valve 30 through its second delivery outlet 22, and the pressure of oil inlet P also acts on the right-hand member of the valve rod 33 of series flow control valve 30 simultaneously simultaneously.When actuator's smooth motion, the valve rod 24 of pressure-compensated valve 20 is in equilibrium position, and the valve rod 32 of series flow control valve 30 is also in equilibrium position.Now, the spring force of the elastic element 33 of the pressure difference that produces through the restriction 13 of valve rod 12 of fluid and series flow control valve 30 is equal.Therefore, the spring force of elastic element 33 is less, then the pressure difference before and after restriction 13 place is just less.But the spring force of elastic element 23 is limited, thus when causing load higher, the pressure at oil inlet P place and the pressure of load more close, like this, cause the pressure of oil inlet P that pressure-compensated valve 20 can not be made to open, actuator cannot action.
When the valve rod 12 of selector valve 10 is in little aperture position, the flow through the restriction 13 of valve rod 12 reduces, and the pressure difference before and after the restriction 13 of valve rod 12 increases, and the elastic element 33 of series flow control valve 30 is compressed, and the opening of the valve rod 32 of series flow control valve 30 increases.Because the spring rate of elastic element 33 is larger, its spring force also changes greatly, therefore, the valve rod 32 of series flow control valve 30 can not be made to tend to balance fast, cause the changes in flow rate through series flow control valve 30 larger, thus cause the flow at restriction 13 place through valve rod 12 constantly to change, produce when selector valve 10 is in little opening, its action discontinuous and shake phenomenon.
Summary of the invention
The present invention aims to provide a kind of feedback arrangements for speed regulation and engineering machinery, and to solve in prior art, the power loss when meta is large, serious problem of generating heat.
For solving the problems of the technologies described above, according to a first aspect of the invention, provide a kind of feedback arrangements for speed regulation, feedback arrangements for speed regulation comprise filler opening, return opening, multiple actuator port and load feedback mouth, and feedback arrangements for speed regulation also comprise selector valve, pressure-compensated valve, series flow control valve and pilot-actuated valve; Filler opening is connected with selector valve and pressure-compensated valve successively by the first oil circuit, first delivery outlet of pressure-compensated valve is connected with selector valve the first delivery outlet of pressure-compensated valve is switchably connected with multiple actuator port by selector valve, pressure-compensated valve also comprises the second delivery outlet for output loading feedback pressure oil, and the second delivery outlet is connected with load feedback mouth; A part for load feedback pressure oil flows into the control port of series flow control valve by pilot-actuated valve; Filler opening is connected with series flow control valve and return opening successively by the second oil circuit; Pilot-actuated valve, under the pressure oil of the second oil circuit and the effect of load feedback pressure oil, controls the load feedback pressure oil flowing into the control port of series flow control valve through pilot-actuated valve; The aperture of series flow control valve is subject to the control of the pressure oil of the second oil circuit and the load feedback pressure oil from pilot-actuated valve.
Further, series flow control valve comprises inlet opening, delivery outlet and control mouth; Pilot-actuated valve comprises the first filler opening, controls mouth and load feedback mouth; The filler opening of feedback adjustment device is connected with the first filler opening of the inlet opening of series flow control valve and pilot-actuated valve, the delivery outlet of series flow control valve is connected by the return opening of one-way valve with feedback adjustment device, the control mouth of pilot-actuated valve is connected with the control mouth of series flow control valve, and the load feedback mouth of pilot-actuated valve is connected with the load feedback mouth of feedback adjustment device.
Further, feedback arrangements for speed regulation also comprise flow stabilizer, and the load feedback pressure oil from the second delivery outlet of pressure-compensated valve flows to series flow control valve successively after flow stabilizer and pilot-actuated valve.
Further, feed back arrangements for speed regulation and also comprise the relief valve be connected with filler opening.
Further, pilot-actuated valve comprises valve body, valve rod and elastic element, the pressure oil of the second oil circuit provides the first active force to valve rod, elastic element provides the second active force to valve rod, load feedback pressure oil provides the 3rd active force to valve rod, second active force is identical with the direction of the 3rd active force, and the first active force is contrary with the direction of the second active force.
Further, pilot-actuated valve also comprises control oil pocket, and series flow control valve comprises spring chamber, and the second oil circuit is connected with control oil pocket through the spring chamber of series flow control valve, control oil pocket provides the 4th active force to the valve rod of pilot-actuated valve, and the direction of the 4th active force is identical with the direction of the second active force.
Further, pilot-actuated valve also comprises oil back chamber, and when controlling the pressure increase in oil pocket to the first predetermined value, oil back chamber is communicated with control oil pocket or spring chamber.
Further, pilot-actuated valve also comprises plunger; Form the first acting chamber between the end of the first end of plunger and the valve rod of pilot-actuated valve, the second end of plunger is formed with the second acting chamber; Second oil circuit is connected with the first acting chamber after the first damper, and the second oil circuit provides the first active force by the first acting chamber to valve rod; Second oil circuit is connected with the second acting chamber, and the pressure of the second acting chamber is greater than the pressure of the first acting chamber, there is provided the 5th active force to the valve rod of pilot-actuated valve under the effect of the pressure difference of plunger between the second acting chamber and the first acting chamber, the direction of the 5th active force is identical with the direction of the first active force.
According to a first aspect of the invention, provide a kind of engineering machinery, comprise feedback arrangements for speed regulation, these feedback arrangements for speed regulation are above-mentioned feedback arrangements for speed regulation.
Further, engineering machinery is environmental sanitation machinery.
Series flow control valve in the present invention is subject to load feedback pressure oil, from the pressure oil of the second oil circuit and the effect of the elastic element of self simultaneously, its elastic element only needs to overcome load feedback pressure oil and the pressure difference from the pressure oil of the second oil circuit, and this makes the elastic element of series flow control valve not need to have larger rigidity.When selector valve is in meta, series flow control valve can be opened by pressure oil in the second oil circuit relatively easily, thus decreases the power loss of system, also reduces the heating value of series flow control valve, serves good energy-saving effect.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the schematic diagram of feedback arrangements for speed regulation of the prior art;
Fig. 2 diagrammatically illustrates the partial structurtes schematic diagram of the series flow control valve in Fig. 1;
Fig. 3 diagrammatically illustrates the sectional view of selector valve in Fig. 1 and pressure-compensated valve;
Fig. 4 diagrammatically illustrates the schematic diagram of the feedback arrangements for speed regulation in the present invention;
Fig. 5 diagrammatically illustrates the partial sectional view of pilot-actuated valve in the present invention and series flow control valve; And
Fig. 6 diagrammatically illustrates the sectional view of selector valve in the present invention and pressure-compensated valve.
Reference character in figure: 10, selector valve; 11, valve body; 12, valve rod; 13, restriction; 20, pressure-compensated valve; 21, the first delivery outlet; 22, the second delivery outlet; 23, elastic element; 24, valve rod; 25, steel ball; 30, series flow control valve; 31, spring chamber; 32, valve rod; 33, elastic element; 34, inlet opening; 35, delivery outlet; 36, mouth is controlled; 40, pilot-actuated valve; 41, valve body; 42, valve rod; 43, elastic element; 44, oil pocket is controlled; 45, oil back chamber; 46, plunger; 47, the first acting chamber; 48, the second acting chamber; 49, the first damper; 50, the second damper; 52, back oil road; 53, screw plug; 54, oil groove; 55, load feedback chamber; 60, flow stabilizer; 70, relief valve; 80, one-way valve; 91, the first oil duct; 92, the second oil duct; 93, the 3rd oil duct; 401, the first filler opening; 402, mouth is controlled; 403, load feedback mouth; P, filler opening; T, return opening; A, actuator port; B, actuator port; LS, load feedback mouth.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As a first aspect of the present invention, provide a kind of feedback arrangements for speed regulation, it can be used for the Constant Pump System with proportional multi-way valve Constant Pump System or load-sensitive, especially, also can be applicable in the engineering machinery such as environmental sanitation machinery.Incorporated by reference to shown in Fig. 4 to Fig. 6, the feedback arrangements for speed regulation in the present invention comprise oil inlet P, oil return inlet T, multiple actuator port A, B and load feedback mouth LS.
As shown in Figures 4 to 6, feed back arrangements for speed regulation and also comprise selector valve 10, pressure-compensated valve 20, series flow control valve 30 and pilot-actuated valve 40.Wherein, oil inlet P is connected with selector valve 10 and pressure-compensated valve 20 successively by the first oil circuit, first delivery outlet 21 of pressure-compensated valve 20 is connected with selector valve 10 first delivery outlet 21 of pressure-compensated valve 20 is switchably connected with multiple actuator port A, B, the second delivery outlet 22, second delivery outlet 22 that pressure-compensated valve 20 also comprises for output loading feedback pressure oil is connected with load feedback mouth LS.Oil inlet P is connected with series flow control valve 30 and oil return inlet T successively by the second oil circuit.A part for load feedback pressure oil flows into the control port of series flow control valve 30 by pilot-actuated valve 40, such as, can flow into its spring chamber 31 further.
Please refer to Fig. 4, the pressure oil that pump exports flows to selector valve 10 and series flow control valve 30 after flowing into feedback arrangements for speed regulation from oil inlet P respectively.Wherein, the pressure oil flowing to series flow control valve 30 is finally flowed out by oil return inlet T.Further, the pressure oil flowing through series flow control valve 30 is subject to the control of the aperture of series flow control valve 30, by regulating the aperture of series flow control valve 30, just can control flow check to the pressure oil of oil return inlet T.When the pressure oil flowed out by oil return inlet T is increased, the pressure oil flowing to selector valve 10 will correspondingly reduce, thus can control, after selector valve 10, to be flowed to the pressure of the pressure oil of load by actuator port A and B.Especially, when series flow control valve 30 leaves full-time, the pressure oil of oil inlet P, all after series flow control valve 30, is flowed out by oil return inlet T.
In addition, when pressure oil is through selector valve 10 feed pressure recuperation valve 20, pressure-compensated valve 20 is fed back to load feedback mouth LS.Meanwhile, the load feedback pressure oil that pressure-compensated valve 20 exports, also flows to pilot-actuated valve 40.Like this, pilot-actuated valve 40 is subject to the pressure oil of the second oil circuit and the effect of load feedback pressure oil simultaneously, so this load feedback pressure oil just can be utilized to control the aperture of pilot-actuated valve 40.In addition, load feedback pressure oil is also connected with the control port of series flow control valve 30 by pilot-actuated valve 40, like this, pilot-actuated valve 40, under the pressure oil of the second oil circuit and the effect of load feedback pressure oil, just can control the load feedback pressure oil flowing into the control port of series flow control valve 30 through pilot-actuated valve 40.So the aperture of series flow control valve 30 is subject to the control of the pressure oil of the second oil circuit and the load feedback pressure oil from pilot-actuated valve 40.
Visible, the present invention controls series flow control valve 30 by load feedback pressure oil further to the control of pilot-actuated valve 40, and therefore, pilot-actuated valve 40 does not need to have larger through-current capability, its physical dimension does not need to design larger yet, and the elastic element of its inside also can design less.
In addition, series flow control valve 30 is subject to load feedback pressure oil, from the pressure oil of the second oil circuit and the effect of the elastic element of self simultaneously, wherein, load feedback pressure oil is contrary with the direction of active force produced from the pressure oil of the second oil circuit, therefore, elastic element only needs the pressure difference overcoming load feedback pressure oil and the pressure oil from the second oil circuit, and this makes the elastic element 33 of series flow control valve 30 not need to have larger rigidity.When selector valve 10 is in meta, series flow control valve 30 can be opened by pressure oil in the second oil circuit relatively easily, thus decreases the power loss of system, also reduces the heating value of series flow control valve 30, serves good energy-saving effect.
Please refer to Fig. 4, preferably, series flow control valve 30 comprises inlet opening 34, delivery outlet 35 and controls mouth 36; Pilot-actuated valve 40 comprises the first filler opening 401, controls mouth 402 and load feedback mouth 403; The oil inlet P of feedback adjustment device is connected with the first filler opening 401 of the inlet opening 34 of series flow control valve 30 and pilot-actuated valve 40, the delivery outlet of series flow control valve 30 is connected with the oil return inlet T of feedback adjustment device by one-way valve 80, the control mouth 402 of pilot-actuated valve 40 is connected with the control mouth 36 of series flow control valve 30, and the load feedback mouth 403 of pilot-actuated valve 40 is connected with the load feedback mouth LS of feedback adjustment device.
Please refer to Fig. 4, preferably, feedback arrangements for speed regulation also comprise flow stabilizer 60, and the load feedback pressure oil from the second delivery outlet 22 of pressure-compensated valve 20 flows to series flow control valve 30 successively after flow stabilizer 60 and pilot-actuated valve 40.The flow of the pressure oil flowing into pilot-actuated valve 40 can be stablized by flow stabilizer 60, thus further increase the service behaviour of feedback arrangements for speed regulation, prevent it from producing the problem of shake.Preferably, feed back arrangements for speed regulation and also comprise the relief valve 70 be connected with oil inlet P, to be protected whole feedback arrangements for speed regulation by relief valve 70.Preferably, feedback arrangements for speed regulation also comprise one-way valve 80, and series flow control valve 30 is connected with oil return inlet T by one-way valve 80.Preferably, the oil outlet of relief valve 70 is connected with oil return inlet T by one-way valve 80.
Please refer to Fig. 4 and Fig. 5, preferably, pilot-actuated valve 40 comprises valve body 41, valve rod 42 and elastic element 43, the pressure oil of the second oil circuit provides the first active force to valve rod 42, elastic element 43 provides the second active force to valve rod 42, load feedback pressure oil provides the 3rd active force to valve rod 42, and the second active force is identical with the direction of the 3rd active force, and the first active force is contrary with the direction of the second active force.As Fig. 5, the active force that elastic element 43 and load feedback pressure oil make valve rod 42 be subject to upwards, and the pressure oil of the second oil circuit makes valve rod 42 be subject to downward active force.When active force is upwards greater than downward active force, valve rod 42 moves upward, otherwise valve rod 42 moves downward.Like this, just by the motion of valve rod 42, control the load feedback pressure oil being flowed to series flow control valve 30 by pilot-actuated valve 40, thus reach the object of the aperture controlling series flow control valve 30.
As shown in Figure 5, preferably, pilot-actuated valve 40 also comprises control oil pocket 44, series flow control valve 30 comprises spring chamber 31, second oil circuit is connected with control oil pocket 44 through the spring chamber 31 of series flow control valve 30, control oil pocket 44 provides the 4th active force to the valve rod 42 of pilot-actuated valve 40, and the direction of the 4th active force is identical with the direction of the second active force.Wherein, series flow control valve 30 also comprises the elastic element 33 be arranged in spring chamber 31.Please refer to Fig. 5, from the pressure oil of oil inlet P after the first filler opening 401, first oil duct 91 of the inlet opening 34 of series flow control valve 30, pilot-actuated valve 30, flow into the spring chamber 31 of series flow control valve 30 successively through control mouth 402, second damper 50 of the first damper 49, pilot-actuated valve 40 and the control mouth 36 of series flow control valve 30, and further by spring chamber 31 through the second oil duct 92 ramp metering oil pocket 44.Meanwhile, from the pressure oil of oil inlet P after the first oil duct 91, flow to the upper end of valve rod 42 through the 3rd oil duct 93, be subject to the first downward active force to make valve rod 42.Wherein, the pressure oil controlled in oil pocket 44 applies the 4th active force upwards to valve rod 42.Meanwhile, when valve rod 42 moves downward, the volume controlling oil pocket 44 reduces, and the pressure oil in it flows to spring chamber 31 by the second oil duct 92, makes the valve rod 32 of series flow control valve 30 have the trend moved right.Controlling oil pocket 44 and the second damper 50 can suppress because system pressure change or load variations cause the change of series flow control valve 30 aperture effectively, play degenerative effect, like this, by the stability contorting to series flow control valve 30 flow, the stability contorting of the flow of the restriction 13 to the valve rod 12 through selector valve 10 can be realized, improve the valve rod 12 of selector valve 10 when fine motion is done, the stability of actuator, decreases shake.
Such as: when valve rod 32 is to left movement, under the effect of the second damper 50, the pressure in spring chamber 31 and the pressure controlled in oil pocket 44 raise, thus stop valve rod 32 further to left movement; When valve rod 32 moves right, under the effect of the second damper 50, spring chamber 31 can not carry out repairing fully, therefore, valve rod 32 can be stoped to move further to the right.Like this, above-mentioned negative feedback is just achieved.
In order to reach better control effects, preferably, pilot-actuated valve 40 also comprises oil back chamber 45, and when controlling the pressure increase in oil pocket 44 to the first predetermined value, oil back chamber 45 is communicated with control oil pocket 44 or spring chamber 31.Preferably, valve rod 42 is provided with the back oil road 52 for control oil pocket 44 or spring chamber 31 being communicated with oil back chamber 45.Please refer to Fig. 5, oil inlet P pressure increase and in the process that valve rod 42 is moved downward, when back oil road 52 moves downwardly to the position corresponding with spring chamber 31 along with valve rod 42, pressure oil in spring chamber 31 just flows to oil back chamber 45 by back oil road 52, thus the pressure in spring chamber 31 must be discharged, like this, the power that valve rod 32 left end of series flow control valve 30 provides reduces, thus make valve rod to left movement, namely increase the aperture of series flow control valve 30, make more pressure oil by series flow control valve 30 oil return.
Preferably, as shown in Figure 5, pilot-actuated valve 40 also comprises plunger 46.Form the first acting chamber 47 between the end of the first end of plunger 46 and the valve rod 42 of pilot-actuated valve 40, the second end of plunger 46 is formed with the second acting chamber 48.Second oil circuit is connected with the first acting chamber 47 after the first damper 49, and the second oil circuit provides the first active force by the first acting chamber 47 to valve rod 42.Second oil circuit is connected with the second acting chamber 48, and the pressure of the second acting chamber 48 is greater than the pressure of the first acting chamber 47, valve rod 42 to pilot-actuated valve 40 under the effect of the pressure difference of plunger 46 between the second acting chamber 48 and the first acting chamber 47 provides the 5th active force, and the direction of the 5th active force is identical with the direction of the first active force.
Please refer to Fig. 5, from the pressure oil of oil inlet P after the first oil duct 91, the oil groove 54 on screw plug 53 flows to the upper end of plunger 46 downwards.Meanwhile, be positioned at the pressure oil of the first acting chamber 47, apply the first downward active force to valve rod 42 on the one hand, also apply an active force upwards to plunger 46 simultaneously.Like this, plunger 46 is actual, and what be subject to is act on making a concerted effort of two power thereon, and effect downward active force is thereon greater than active force upwards, and that is, plunger 46 is subject to downward making a concerted effort.Therefore, can apply the 5th downward active force to valve rod 42 by plunger 46, the pressure difference produced by the first damper 49 due to the 5th active force realizes, and therefore, the 5th active force is less.Like this, by the 5th less active force, the motion of valve rod 42 can be made more steady, further mitigate the problem of shake.
Obviously, pilot-actuated valve 40 in the present invention is not limited to the specific constructive form in the various embodiments described above, those skilled in the art can also adopt other existing pilot-actuated valve, as long as this pilot-actuated valve has two hydraulic control hydraulic fluid ports, and the elastic element of the pressure of these two hydraulic control hydraulic fluid ports and pilot-actuated valve 40 can be utilized to control the motion of valve rod.
Below in conjunction with Fig. 4, Fig. 5 and Fig. 6, the flowing of pressure oil is further described.
As shown in Figure 6, selector valve 10 comprises valve body 11 and valve rod 12.When valve rod 12 is positioned at meta, does not have pressure oil to flow through pressure-compensated valve 20, correspondingly, please refer to Fig. 4, the pressure of the load feedback pressure oil that pressure-compensated valve 20 exports is zero, and the pressure in the load feedback chamber 55 of pilot-actuated valve 40 is zero.Please refer to Fig. 4 and Fig. 5, the pressure oil from oil inlet P is divided into two-way to flow to series flow control valve 30 and pilot-actuated valve 40 respectively.
Please refer to Fig. 4 and Fig. 5, wherein a road flows directly to the right side of the valve rod 32 of series flow control valve 30; Another road flows in the second acting chamber 48 of plunger 46 upper end through the oil groove 54 of the first oil duct 91 and screw plug 53 successively, in addition, in the first acting chamber 47 also successively between the upper end that the first oil duct 91, first damper 49 and the 3rd oil duct 93 flow into the valve rod 42 of plunger 46 and pilot-actuated valve 40, meanwhile, also flow into the spring chamber 31 of series flow control valve 30 through the first oil duct 91, first damper 49 and the second damper 50 successively and flowed into the control oil pocket 44 of pilot-actuated valve 40 further by spring chamber 31 through the second oil duct 92.
Now, the valve rod 42 of pilot-actuated valve 40 is subject to the first active force, elastic element 43 the second active force upwards that the pressure oil in the first acting chamber 47 provides respectively, controls the 4th active force upwards that the pressure oil in oil pocket 44 provides and the 5th active force provided by plunger 46.Under the effect of above-mentioned several power, the valve rod 42 of pilot-actuated valve 40 moves down, thus the back oil road 52 on valve rod 42 is communicated with oil back chamber 45.So the pressure oil in the spring chamber 31 of series flow control valve 30 flows into oil back chamber 45 through the second damper 50 and back oil road 52.Because the rigidity of the elastic element 33 of series flow control valve 30 is less, therefore, only need the elastic force of the elastic element 33 overcoming series flow control valve 30, just the valve rod 32 of series flow control valve 30 can be opened, make the pressure oil entered by oil inlet P flow back to fuel tank through series flow control valve 30 by oil return inlet T, achieve the function of meta off-load.
Please refer to Fig. 6, when the valve rod 12 promoting selector valve 10 moves, and when making it be in little open state, be applied to the upper end of the valve rod 24 of pressure-compensated valve 20 after the restriction 13 of pressure oil on the valve rod 12 of selector valve 10 of oil inlet P produces pressure drop, and overcome the elastic element 23 of pressure-compensated valve 20 and valve rod 24 is moved downward.So pressure oil, after pressure-compensated valve 20, further by the left of the selector valve 10 in Fig. 6 or the branch on right side, flows to actuator port A or actuator port B, oily to export the induced pressure worked for actuator's (i.e. load).Now, the aperture of induced pressure oil on the valve rod 24 of pressure-compensated valve 20, pushes the steel ball 25 of pressure-compensated valve 20 open and enters the lower end of valve rod 24, and being output into load feedback pressure oil further across the second delivery outlet 22 on pressure-compensated valve 20.
Further, the load feedback pressure oil that the second delivery outlet 22 exports flows into the load feedback chamber 55 of pilot-actuated valve 40 through the load feedback mouth 403 of pilot-actuated valve 40.When the active force upwards that pilot-actuated valve 40 is subject to is greater than downward active force, the valve rod 42 of pilot-actuated valve 40 moves up, the aperture of the back oil road 52 on its valve rod 42 reduces, so, pressure in the spring chamber 31 of series flow control valve 30 raises, thus force the valve rod 32 of series flow control valve 30 to move right, even if the aperture of series flow control valve 30 reduces.Like this, the pressure of oil inlet P constantly raises, thus causes the pressure difference before and after the restriction 13 of the valve rod 12 of selector valve 10 to increase lentamente.When valve rod 42 stressed of pilot-actuated valve 40 reaches balance, valve rod 42 is in equilibrium position.Now, the valve rod 32 of series flow control valve 30 also tends to balance, thus makes the flow of the restriction 13 of the valve rod 12 flowing through selector valve 10 keep stable, therefore improves the stability of valve rod 12 when little opening.
Then, when the pressure of oil inlet P raises, the pressure from oil inlet P that the upper end of the valve rod 42 of pilot-actuated valve 40 is subject to also increases, and the final valve rod 42 that promotes moves downward.Along with moving downward of valve rod 42, the pressure controlled in oil pocket 44 raises, thus forces the valve rod 32 of series flow control valve 30 to move right, to reduce the aperture of series flow control valve 30.In the process, the volume of the spring chamber 31 of series flow control valve 30 becomes large, and the pressure in control oil pocket 44 and spring chamber 31 is reduced.Like this, reduce oil liquid pressure in the elastic element 33 that the left side of the valve rod 32 of series flow control valve 30 is subject to and spring chamber 31 with joint efforts, the pressure from oil inlet P suffered by the right side of valve rod 32 is then constant, therefore, effectively inhibits the reduction amplitude of series flow control valve 30 aperture.Then, the valve rod 42 of pilot-actuated valve 40 moves up again, thus makes its valve rod 42 be in new equilibrium position, and correspondingly, the valve rod 32 of series flow control valve 30 is also in rapidly new state of equilibrium.
(mean the pressure increase of load feedback pressure oil) when load increases, the pressure in the load feedback chamber 55 of pilot-actuated valve 40 also increases, so the active force upwards that its valve rod 42 is subject to also increases gradually, and finally makes valve rod 42 move upward.In the process that valve rod 42 moves upward, the volume controlling oil pocket 44 increases, pressure reduces, so the valve rod 32 of series flow control valve 30 is to left movement, and to make, the aperture of series flow control valve 30 increases, its spring chamber 31 pressurized.Be subject to the effect of the pressure oil from the second damper 50, the pressure of the spring chamber 31 of series flow control valve 30 and the control oil pocket 44 of pilot-actuated valve 40 raises, thus effective increase amplitude that inhibit the aperture of series flow control valve 30, and the pressure at oil inlet P place is raised, until pilot-actuated valve 40 is in new equilibrium position again, correspondingly, series flow control valve 30 is also in rapidly new equilibrium position.
When load and flow (being namely supplied to the flow of oil inlet P by pump) increase suddenly simultaneously, if the valve rod 12 of selector valve 10 is in little open state, so the pressure rising of oil inlet P can cause the pressure difference before and after its restriction 13 to increase, to make the valve rod 32 of series flow control valve 30 be moved to the left, i.e. the aperture increase of series flow control valve 30, the pressure increase of its spring chamber 31.Like this, series flow control valve 30 just can be made to be in a certain aperture, thus ensure that the stable of the flow of the restriction 13 of the valve rod 12 flowing through selector valve 10, achieve under high capacity large discharge operating mode, even if when selector valve is in little opening, system also can regular event.
The present invention adopts the mode of local internal control load feedback pressure oil to be fed back to the bottom of the valve rod 42 of pilot-actuated valve 40, and by the top of system pressure feedback to the valve rod 42 of pilot-actuated valve 40, the position of the valve rod 42 of pilot-actuated valve 40 is changed by the pressure difference of the two pressure, thus change the position of the valve rod 32 of series flow control valve 30 further, ensure that the pressure of oil inlet P changes with the change of load, improve the action stability of valve rod 32 when little opening of series flow control valve 30, also reduce the energy loss of system when meta simultaneously.Feedback arrangements for speed regulation in the present invention are not only applicable to the proportional multi-way valve Constant Pump System of environmental sanitation machinery etc., are also applicable to the Constant Pump System etc. of load-sensitive.
As a second aspect of the present invention, provide a kind of engineering machinery, comprise feedback arrangements for speed regulation, these feedback arrangements for speed regulation are the feedback arrangements for speed regulation in the various embodiments described above.Especially, engineering machinery can be environmental sanitation machinery etc.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. feedback arrangements for speed regulation, described feedback arrangements for speed regulation comprise filler opening (P), return opening (T), multiple actuator port (A, B) and load feedback mouth (LS), it is characterized in that,
Described feedback arrangements for speed regulation also comprise selector valve (10), pressure-compensated valve (20), series flow control valve (30) and pilot-actuated valve (40);
Described filler opening (P) is connected with described selector valve (10) and described pressure-compensated valve (20) successively by the first oil circuit, first delivery outlet (21) of described pressure-compensated valve (20) is connected with described selector valve (10) to make first delivery outlet (21) of described pressure-compensated valve (20) by described selector valve (10) and described multiple actuator port (A, B) switchably connect, described pressure-compensated valve (20) also comprises the second delivery outlet (22) for output loading feedback pressure oil, described second delivery outlet (22) is connected with described load feedback mouth (LS), a part for described load feedback pressure oil flows into the control port of described series flow control valve (30) by described pilot-actuated valve (40),
Described filler opening (P) is connected with described series flow control valve (30) and described return opening (T) successively by the second oil circuit;
Described pilot-actuated valve (40), under the pressure oil of described second oil circuit and the effect of described load feedback pressure oil, controls the load feedback pressure oil flowing into the control port of described series flow control valve (30) through described pilot-actuated valve (40);
The aperture of described series flow control valve (30) is subject to the control of the pressure oil of described second oil circuit and the described load feedback pressure oil from described pilot-actuated valve (40);
Wherein, described pilot-actuated valve (40) comprises valve body (41), valve rod (42) and elastic element (43), the pressure oil of described second oil circuit provides the first active force to described valve rod (42), described elastic element (43) provides the second active force to described valve rod (42), described load feedback pressure oil provides the 3rd active force to described valve rod (42), described second active force is identical with the direction of described 3rd active force, and described first active force is contrary with the direction of described second active force.
2. feedback arrangements for speed regulation according to claim 1, is characterized in that,
Described series flow control valve (30) comprises inlet opening (34), delivery outlet (35) and controls mouth (36);
Described pilot-actuated valve (40) comprises the first filler opening (401), controls mouth (402) and load feedback mouth (403);
The filler opening (P) of described feedback arrangements for speed regulation is connected with first filler opening (401) of the inlet opening (34) of described series flow control valve (30) and described pilot-actuated valve (40), the delivery outlet of described series flow control valve (30) is connected with the return opening (T) of described feedback arrangements for speed regulation by one-way valve (80), the control mouth (402) of described pilot-actuated valve (40) is connected with the control mouth (36) of described series flow control valve (30), the load feedback mouth (403) of described pilot-actuated valve (40) is connected with the load feedback mouth (LS) of described feedback arrangements for speed regulation.
3. feedback arrangements for speed regulation according to claim 1, it is characterized in that, described feedback arrangements for speed regulation also comprise flow stabilizer (60), and the load feedback pressure oil from second delivery outlet (22) of described pressure-compensated valve (20) flows to described series flow control valve (30) successively after described flow stabilizer (60) and described pilot-actuated valve (40).
4. feedback arrangements for speed regulation according to claim 1, is characterized in that, described feedback arrangements for speed regulation also comprise the relief valve (70) be connected with described filler opening (P).
5. feedback arrangements for speed regulation according to claim 1, it is characterized in that, described pilot-actuated valve (40) also comprises control oil pocket (44), described series flow control valve (30) comprises spring chamber (31), the spring chamber (31) of described second oil circuit through described series flow control valve (30) is connected with described control oil pocket (44), described control oil pocket (44) provides the 4th active force to the valve rod (42) of described pilot-actuated valve (40), and the direction of described 4th active force is identical with the direction of described second active force.
6. feedback arrangements for speed regulation according to claim 5, it is characterized in that, described pilot-actuated valve (40) also comprises oil back chamber (45), when the pressure increase in described control oil pocket (44) is to the first predetermined value, described oil back chamber (45) is communicated with described control oil pocket (44) or described spring chamber (31).
7. feedback arrangements for speed regulation according to claim 1, is characterized in that, described pilot-actuated valve (40) also comprises plunger (46); Form the first acting chamber (47) between the end of the first end of described plunger (46) and the valve rod (42) of described pilot-actuated valve (40), the second end of described plunger (46) is formed with the second acting chamber (48);
Described second oil circuit is connected with described first acting chamber (47) after the first damper (49), and described second oil circuit provides described first active force by described first acting chamber (47) to described valve rod (42);
Described second oil circuit is connected with described second acting chamber (48), and the pressure of described second acting chamber (48) is greater than the pressure of described first acting chamber (47), valve rod (42) to described pilot-actuated valve (40) under the effect of the pressure difference of described plunger (46) between described second acting chamber (48) and described first acting chamber (47) provides the 5th active force, and the direction of described 5th active force is identical with the direction of described first active force.
8. an engineering machinery, comprises feedback arrangements for speed regulation, it is characterized in that, described feedback arrangements for speed regulation are the feedback arrangements for speed regulation according to any one of claim 1 to 7.
9. engineering machinery according to claim 8, is characterized in that, described engineering machinery is environmental sanitation machinery.
CN201210447208.9A 2012-11-09 2012-11-09 Feedback speed regulation device and engineering machinery Active CN102900716B (en)

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CN102506030A (en) * 2011-09-26 2012-06-20 三一重型装备有限公司 Multi-way valve and tunnel boring machine

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JP3264651B2 (en) * 1998-04-28 2002-03-11 東芝機械株式会社 Hydraulic control device
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CN102506030A (en) * 2011-09-26 2012-06-20 三一重型装备有限公司 Multi-way valve and tunnel boring machine
CN102287413A (en) * 2011-09-29 2011-12-21 卢宇 Proportional multi-way valve with turning load feedback function
CN202251199U (en) * 2011-10-20 2012-05-30 常德中联重科液压有限公司 Electro-hydraulic proportional combined maneuvering valve

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