CN103697000A - Hydraulic control system for realizing stepless speed change of actuating mechanism - Google Patents
Hydraulic control system for realizing stepless speed change of actuating mechanism Download PDFInfo
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- CN103697000A CN103697000A CN201310643364.7A CN201310643364A CN103697000A CN 103697000 A CN103697000 A CN 103697000A CN 201310643364 A CN201310643364 A CN 201310643364A CN 103697000 A CN103697000 A CN 103697000A
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Abstract
A hydraulic control system for realizing the stepless speed change of an actuating mechanism comprises a fixed displacement pump, a main valve, an oil tank, a first oil passage, the actuating mechanism and a second oil passage, the fixed displacement pump is connected with the oil tank, the main valve is connected with the fixed displacement pump, a first proportional reversing valve is arranged on the first oil passage, and a first switching valve is arranged on the second oil passage; the hydraulic control system also comprises a speed change control oil passage, the speed change control oil passage is connected with the control port of the first proportional reversing valve, a proportional reducing valve and a pilot oil source are connected with the speed change control oil passage, the proportional reducing valve is connected between the control port of the first proportional reversing valve and the pilot oil source, the pilot oil of the pilot oil source gets to the control port of the first proportional reversing valve via the proportional reducing valve, the proportional reducing valve controls the control pressure applied on the control port of the first proportional reversing valve to gradually change between a lower limit value and an upper limit value, and the first proportional reversing valve is correspondingly controlled at different positions between full closing and full opening. The hydraulic control system can realize the stepless speed change of the actuating mechanism only with the fixed displacement pump.
Description
Technical field
The present invention relates to hydraulic control system, relate in particular to a kind of infinite variable speed hydraulic control system of actuator that realizes.
Background technique
At present, engineering machinery is more and more towards high efficiency, high-power, large-tonnage, highi degree of accuracy, the future development such as steady.Engineering machinery, for raising the efficiency, generally adopts composite move, for example revolution, lifting, equipment work (take continuous wall trench machine as example, its equipment is grab bucket, and grab bucket needs to open and close) etc.Wherein, with the rotation motion of engineering machinery, because rotary inertia is larger, car body shaking amplitude is larger, particularly, in rotating process, is starting and the anxious stopping time, easily impact phenomenon large, galloping, this just needs swirl gear can realize stepless speed regulation control.
Referring to Fig. 1, is a kind of existing hydraulic control system that is applied to swirl gear, and it comprises rotary reducer 11, break 12, motor 13, sequence valve 14,15, equilibrium valve 16,17 and brake circuit 18.Described motor 13 drives rotary reducer 11 to rotate, and described break 12 is for braking the rotation of motor 13.Described swirl gear also comprises the first working oil path 19a and the second working oil path 19b, described the first working oil path 19a connects the actuator port A of main valve (not shown) and one end of motor 13, and described the second working oil path 19b connects the actuator port B of main valve and the other end of motor 13.Described sequence valve 14,15 is connected between the two ends of motor 13 separately, and two sequence valve 14,15 Opposite direction connections.Described equilibrium valve 16,17 is separately positioned on described the first working oil path 19a and the second working oil path 19b.It is upper that described brake circuit 18 is connected to described the first working oil path 19a and the second working oil path 19b by shuttle valve, with the pressure oil by described the first working oil path 19a or the second working oil path 19b to break 12 brake offs.When actuator port A fuel feeding, pressure oil carries out fuel feeding through the one-way valve in equilibrium valve 16 to the left end of motor 13, and the pressure oil that actuator port A provides simultaneously can be opened the sequence valve of equilibrium valve 17, thereby opens oil circuit, the second working oil path 19b, realizes the smooth oil return of motor 13.Described sequence valve 14,15 is overflow Protective valve, plays shock-resistant and effect overload protection.
In above-mentioned swirl gear, for realizing stepless speed regulation, generally adopting variable displacement pump is hydraulic system fuel feeding, by changing pump delivery, realizes speed governing, and for guaranteeing the stability of hydraulic system, need main valve, variable displacement pump, the guide proportion control valve of employing often expensive; In addition, because at present a lot of engineering machinery tonnages is larger, therefore its rotary inertia is larger, therefore it is larger that revolution starts, the anxious stopping time will cause engineering machinery integral body to rock, affect working life, and because rotary inertia causes more greatly hydraulic shock also larger, the linkage structure of mechanism's part of meeting spoiled work machinery.
Summary of the invention
In view of the above, be necessary to provide a kind of and realize the infinite variable speed hydraulic control system of actuator without what adopt variable displacement pump.
A kind of infinite variable speed hydraulic control system of actuator that realizes, comprise metering pump, main valve, fuel tank, the first oil circuit, actuator, and second oil circuit, the filler opening of described metering pump is connected with described fuel tank, described main valve is connected with the oil outlet of described metering pump, described main valve has the first actuator port and the second actuator port, described the first oil circuit connects one end of described the first actuator port and described actuator, described the second oil circuit connects the other end of described the second actuator port and described actuator, described the first oil circuit is provided with the first proportional reversing valve, described the second oil circuit is provided with the first switch valve, described hydraulic control system also comprises speed Control oil circuit, described speed Control oil circuit connects the control mouth of described the first proportional reversing valve, on described speed Control oil circuit, be connected with proportional pressure-reducing valve and pilot control, described proportional pressure-reducing valve is connected between the control mouth and described pilot control of described the first proportional reversing valve, the guide oil of described pilot control arrives the control mouth of described the first proportional reversing valve through described proportional pressure-reducing valve, the pilot pressure that described proportional pressure-relief valve control is applied on the control mouth of described the first proportional reversing valve gradually changes between lower limit and CLV ceiling limit value, described the first proportional reversing valve is correspondingly controlled in cut-off and the completely diverse location between conducting completely.
Further, described hydraulic control system also comprises three oil circuit in parallel with described the first oil circuit and four oil circuit in parallel with described the second oil circuit, described the 3rd oil circuit is provided with second switch valve, described the 4th oil circuit is provided with the second proportional reversing valve, described speed Control oil circuit also connects the control mouth of described the second proportional reversing valve, on described speed Control oil circuit, be also connected with selector valve, described selector valve is connected with described proportional pressure-reducing valve, described selector valve has two actuator ports, two actuator ports of described selector valve are connected with the control mouth of described the first proportional reversing valve and the control mouth of described the second proportional reversing valve respectively.
Further, described selector valve is 3-position 4-way pilot operated directional control valve, described selector valve has the first control mouth and second and controls mouth, first of described selector valve control mouthful be connected on described the first oil circuit and be connected to described the first proportional reversing valve and described the first actuator port between, second of described selector valve is controlled mouth and is connected on described the 4th oil circuit and is connected between described the second proportional reversing valve and described the second actuator port, the filler opening of described selector valve is connected with the oil outlet of described proportional pressure-reducing valve, and the return opening of described selector valve is connected with fuel tank.
Further, first of described selector valve is controlled between mouth and described the first oil circuit and is provided with the first one-way throttle valve, second of described selector valve is controlled between mouth and described the 4th oil circuit and is provided with the second one-way throttle valve, one-way valve in described the first one-way throttle valve allows fluid to flow to described the first oil circuit from described selector valve, and the one-way valve in described the second one-way throttle valve allows fluid to flow to described the 4th oil circuit from described selector valve.
Further, described the first switch valve and second switch valve are 2/2-way hydraulic control valve, the second control mouthful that first of described the first switch valve is controlled mouth and described second switch valve is all connected with described the first oil circuit, and the second control of described the first switch valve mouthful is all connected with described the 4th oil circuit with the first control mouth of described second switch valve; Described in when described the first switch valve is controlled the first state in cut-off or conducting, second switch valve is controlled in the second contrary state.
Further, first of described the first switch valve control mouthful and described second switch valve second control mouthful be all connected on described the first oil circuit and be connected to described the first proportional reversing valve with described the first actuator port between, second of described the first switch valve is controlled mouthful and first the controlling mouth and be all connected on described the 4th oil circuit and be connected between described the second proportional reversing valve and described the second actuator port of described second switch valve.
Further, described hydraulic control system also comprises the first one-way valve, the second one-way valve and relief valve, in parallel with described actuator again after described the first one-way valve and the series connection of the second one-way valve, the filler opening of described relief valve is connected between the first one-way valve and the second one-way valve, the oil outlet of described relief valve connects fuel tank, described the first one-way valve is installed in the mode that allows fluid to flow to described relief valve from described the first oil circuit, and described the second one-way valve is installed in the mode that allows fluid to flow to described relief valve from described the 4th oil circuit.
Further, described hydraulic control system also comprises the 3rd one-way valve and the 4th one-way valve, in parallel with described actuator again after described the 3rd one-way valve and the series connection of the 4th one-way valve, fuel tank is connected between described the 3rd one-way valve and the 4th one-way valve, described the 3rd one-way valve is installed in the mode that allows fluid to flow to described the first oil circuit from fuel tank, and described the 4th one-way valve is installed in the mode that allows fluid to flow to described the 4th oil circuit from fuel tank.
Further, described hydraulic control system also comprises brake circuit, described brake circuit is provided with break and selector valve, the filler opening of described selector valve is connected with described the 4th oil circuit with described the first oil circuit, the oil outlet of described selector valve is connected with the oil pocket of described break, and described selector valve is alternatively communicated with described the first oil circuit or described the 4th oil circuit.
Further, described proportional pressure-reducing valve comprises electric control handle, and the aperture of described electric control handle is directly proportional to the delivery pressure of described proportional pressure-reducing valve.
Compared to prior art, the setting of passing ratio reduction valve of the present invention and proportional reversing valve, adopts metering pump can realize the stepless change of actuator, has reduced to a certain extent cost.Can carry out by electric control handle the delivery pressure of control ratio reduction valve, make proportional reversing valve be open at arbitrary position, corresponding proportional reversing valve aperture minimum state during the minimum aperture of handle, corresponding proportional reversing valve aperture maximum rating during handle maximum opening, and the increase along with handle aperture, the aperture of proportional reversing valve also increases gradually, realizes the stepless speed regulation to swirl gear, has simplified control mode.In actuator, start and the anxious stopping time, because the open degree of proportional reversing valve has one from the large process of little change (being open time delay), can compensator or trimmer pressure, when opening completely, can accomplish again the output in full of flow, can too much not increase the pressure loss of whole oil circuit.Because proportional pressure-reducing valve can adopt electric control handle, control, for reducing the anxious impact that stops bringing, when realizing the requiring of location, can make slowly electric ratio handle return, reduce hydraulic shock, realize the buffering while stopping; In the situation that needs are located, make handle returning quickly, the anxious stopping time is realized location fast.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of hydraulic control system of the swirl gear of prior art; And
Fig. 2 is the schematic diagram of realizing the infinite variable speed hydraulic control system of actuator of the embodiment of the present invention.
Embodiment
By describing technology contents of the present invention, structure characteristics in detail, being realized object and effect, below in conjunction with mode of execution and coordinate accompanying drawing to be explained in detail.
Refer to Fig. 2, the infinite variable speed hydraulic control system of actuator that realizes of the present invention comprises the first actuator port C, the second actuator port D, the first oil circuit 20, actuator 30, the second oil circuit 40 and speed Control oil circuit 50.Described the first actuator port C is connected Yi Dui actuator 30 fuel feeding with oil supply system 90 with the second actuator port D.Described the first oil circuit 20 connects respectively one end of described the first actuator port C and described actuator 30, and the first oil circuit 20 is provided with the first proportional reversing valve 22; Described the second oil circuit 40 connects respectively the other end of described the second actuator port D and described actuator 30, and the second oil circuit 40 is provided with the first switch valve 42 to control the break-make of the second oil circuit 40.Described speed Control oil circuit 50 connects the control mouth of described the first proportional reversing valve 22, on described speed Control oil circuit 50, be connected with proportional pressure-reducing valve 55 and pilot control 58, wherein proportional pressure-reducing valve 55 is connected between the control mouth and pilot control 58 of the first proportional reversing valve 22.
In above-mentioned hydraulic control system, the delivery pressure of speed Control oil circuit 50 described in proportional pressure-reducing valve 55 capable of regulatings, the pilot pressure of realizing the control mouth of adjusting the first proportional reversing valve 22 gradually changes between lower limit and CLV ceiling limit value, and (wherein lower limit can be zero, CLV ceiling limit value required force value for the first proportional reversing valve 22 can be opened completely time, specifically according to the characteristic of proportional reversing valve, determine), and then the first proportional reversing valve 22 is correspondingly controlled in cut-off and the completely different position between conducting completely, reach and regulate the restriction size of the first proportional reversing valve 22 and the object of through-current capacity.Like this, the oil mass that enters actuator 30 from the first oil circuit 20 also just changes thereupon, realizes the stepless speed regulation of Liao Dui actuator 30.Meanwhile, described the first switch valve 42 is opened, and the fluid of described actuator 30 the other ends flows back to fuel tank by the second oil circuit 40.
Described actuator 30 can be motor or oil cylinder etc.For example, when actuator 30 is motor, it can rotate and reverse, so the two ends of actuator 30 all can be used as oil inlet end or oil outlet end; When actuator 30 is oil cylinder, it can be two-way cylinder, so its rodless cavity and rod chamber all can be used as oil suction chamber or go out oil pocket.Take below described actuator 30 be can clockwise and anticlockwise motor be illustrated as example, described actuator 30 is for driving rotary reducer 31 to rotate, thereby realizes the rotation motion of engineering machinery.
Further, described stepless speed changing hydraulic control system also comprises three oil circuit 70 in parallel with the first oil circuit 20 and four oil circuit 60 in parallel with the second oil circuit 40, described the 3rd oil circuit 70 is provided with second switch valve 72 to control the break-make of the 3rd oil circuit 70, described the 4th oil circuit 60 is provided with the second proportional reversing valve 62, described speed Control oil circuit 50 also connects the control mouth of described the second proportional reversing valve 62, on described speed Control oil circuit 50, be also connected with selector valve 52, described selector valve 52 is connected with described proportional pressure-reducing valve 55, described selector valve 52 has two actuator ports, two actuator ports of described selector valve 52 are connected with the control mouth of described the second proportional reversing valve 62 with the control mouth of described the first proportional reversing valve 22 respectively, and described selector valve 52 can optionally be communicated with described the first proportional reversing valve 22 or the second proportional reversing valve 62 when commutation, the delivery pressure of proportional pressure-reducing valve 55 is optionally applied on the control mouth of the first proportional reversing valve 22 or the second proportional reversing valve 62.
Further, described selector valve 52 is 3-position 4-way pilot operated directional control valve, described selector valve 52 has the first control mouth and second and controls mouth, control mouth and be connected on the first oil circuit 20 and the 4th oil circuit 60 for two of described selector valve 52, the filler opening of described selector valve 52 is connected with the oil outlet of described proportional pressure-reducing valve 55, and the filler opening of described proportional pressure-reducing valve 55 is connected with described pilot control 58.When the first oil circuit 20 oil-feed, the left end pressure of selector valve 52 is greater than right-hand member pressure, the primary importance of selector valve 52 in left position is also communicated with proportional pressure-reducing valve 55 with the control mouth of the first proportional reversing valve 22, the control mouth that flows to the first proportional reversing valve 22 from the fluid of proportional pressure-reducing valve 55 makes the first proportional reversing valve 22 to conduction position, move gradually from rest position, and along with the delivery pressure of proportional pressure-reducing valve 55 increases gradually, the pilot pressure being applied on the control mouth of the first proportional reversing valve 22 also increases gradually, the restriction of the first proportional reversing valve 22 in turn on process also correspondingly increases gradually, flow increases gradually, the left end oil-feed of described actuator 30 is also rotated towards first direction, otherwise, when the 4th oil circuit 60 oil-feed, the right-hand member pressure of selector valve 52 is greater than left end pressure, the second place of selector valve 52 in right position is also communicated with proportional pressure-reducing valve 55 with the control mouth of the second proportional reversing valve 62, the control mouth that flows to the second proportional reversing valve 62 from the fluid of proportional pressure-reducing valve 55 makes the second proportional reversing valve 62 to conduction position, move gradually from rest position, and along with the delivery pressure of proportional pressure-reducing valve 55 increases gradually, the pilot pressure being applied on the control mouth of the second proportional reversing valve 62 also increases gradually, the second proportional reversing valve 62 orifice size in turn on process increases gradually, flow increases gradually, the right-hand member oil-feed of actuator 30 rotating towards contrary second direction.Described selector valve 52 is when meta, two actuator ports of described selector valve 52 are all communicated with fuel tank, the filler opening of described selector valve 52 ends not oil-feed, the control mouth of described the first proportional reversing valve 22 and the second proportional reversing valve 62 is directly communicated with and oil return with the return opening of selector valve 52, described the first proportional reversing valve 22 and the second proportional reversing valve 62 are all in rest position, do not have pressure oil to supply with described actuator 30, described actuator 30 is failure to actuate.
Further, first of described selector valve 52 is controlled mouth and is connected on described the first oil circuit 20 and is connected between the first proportional reversing valve 22 and the first actuator port C, and second of described selector valve 52 is controlled mouth and is connected on described the 4th oil circuit 60 and is connected between the second proportional reversing valve 62 and the second actuator port D.
Further, first of described selector valve 52 is controlled between mouth and the first oil circuit 20 and is provided with the first one-way throttle valve 53a, second of described selector valve 52 is controlled between mouth and the 4th oil circuit 60 and is provided with the second one-way throttle valve 53b, one-way valve in described the first one-way throttle valve 53a allows fluid to flow to the first oil circuit 20 from selector valve 52, and the one-way valve in described the second one-way throttle valve 53b allows fluid to flow to the 4th oil circuit 60 from selector valve 52.
Further, described switch valve 42,72 is 2/2-way hydraulic control valve, the second control mouthful that first of described the first switch valve 42 is controlled mouth and second switch valve 72 is all connected with the first oil circuit 20, and the second control of described the first switch valve 42 mouthful is all connected with the 4th oil circuit 60 with the first control mouth of second switch valve 72; Described in when described the first switch valve 42 is controlled the first state in cut-off or conducting, second switch valve 72 is controlled in the second contrary state.When the first control mouthful of switch valve 42,72 has pressure oil, described switch valve 42,72 becomes on state from cut-off state, and when the second control mouthful of switch valve 42,72 has pressure oil, described switch valve 42,72 becomes cut-off state from state.
Further, second of the first control mouth of described the first switch valve 42 and second switch valve 72 controlled mouth and is all connected on described the first oil circuit 20 and is connected between the first proportional reversing valve 22 and the first actuator port C, and the first control mouthful that second of described the first switch valve 42 is controlled mouth and second switch valve 72 is all connected on described the 4th oil circuit 60 and is connected between the second proportional reversing valve 62 and the second actuator port D.
Further, described hydraulic control system also comprises the first one-way valve 23a, the second one-way valve 23b and relief valve 24, in parallel with described actuator 30 again after described the first one-way valve 23a and the second one-way valve 23b series connection, the filler opening of described relief valve 24 is connected between the first one-way valve 23a and the second one-way valve 23b, the oil outlet of described relief valve 24 connects fuel tank, described the first one-way valve 23a installs in the mode that allows fluid to flow to relief valve 24 from the first oil circuit 20, described the second one-way valve 23a installs in the mode that allows fluid to flow to relief valve 24 from the 4th oil circuit 60.When surpassing predefined value, the induced pressure in two chambeies of actuator 30 can open the first one-way valve 23a or the second one-way valve 23b, and by relief valve 24 overflows, thereby play protection actuator 30, the effect that buffering hydraulic impacts.
Further, described hydraulic control system also comprises the 3rd one-way valve 25a and the 4th one-way valve 25b, in parallel with described actuator 30 again after described the 3rd one-way valve 25a and the 4th one-way valve 25b series connection, fuel tank is connected between described the 3rd one-way valve 25a and the 4th one-way valve 25b, described the 3rd one-way valve 25a installs in the mode that allows fluid to flow to the first oil circuit 20 from fuel tank, and described the 4th one-way valve 25b installs in the mode that allows fluid to flow to the 4th oil circuit 60 from fuel tank.The two ends repairing of described the 3rd one-way valve 25a and the 4th one-way valve 25bNeng Gei actuator 30, thus prevent that actuator's 30 suctions are empty.
Further, described hydraulic control system also comprises brake circuit 80, described brake circuit 80 is provided with break 81 and selector valve 82, the filler opening of described selector valve 82 is connected with described the 4th oil circuit 60 with described the first oil circuit 20 respectively, its oil outlet is connected with the oil pocket of described break 81, and described selector valve 82 is alternatively communicated with described the first oil circuit 20 or the 4th oil circuit 60.Particularly, described selector valve 82 is shuttle valves, when the first oil circuit 20 and the 4th oil circuit 60 any one of them while connecting high pressure oil, this high-pressure oil passage of shuttle valve conducting and break 81, make high pressure oil enter break 81 brake offs, allow actuator's 30 runnings, when the first oil circuit 20 and the 4th oil circuit 60 are not all connected high pressure oil, break 81Dui actuator 30 brakes.Break 81 can be brake cylinder.
Further, on described brake circuit 80, be also provided with pilot operated directional control valve 84, described pilot operated directional control valve 84 comprises cut-off and two states of connection, and the filler opening of described pilot operated directional control valve 84, oil outlet and control mouth are connected with oil outlet, break 81 and the oil outlet of selector valve 82 of described selector valve 82 respectively.When the first oil circuit 20 and the 4th oil circuit 60 are not all connected high pressure oil, described pilot operated directional control valve 84 is in cut-off state, and it can guarantee that now break 81 is in braking state.When the arbitrary oil circuit in the first oil circuit 20 and the 4th oil circuit 60 is connected high pressure oil, high pressure oil is switched to the control mouth of described pilot operated directional control valve 84 to open described pilot operated directional control valve 84, make described pilot operated directional control valve 84 on state, high pressure oil is through described pilot operated directional control valve 84 and be positioned at reduction valve (figure is mark) after described pilot operated directional control valve 84 to arrive break 81(be brake cylinder in the present embodiment), with the braking state of brake off device 81.In the present embodiment, described pilot operated directional control valve 84 is by adopting the method for hydraulic control to control conducting and the disconnection of described pilot operated directional control valve 84, can also realize a kind of braking retardation effect, at the hydraulic control end of described pilot operated directional control valve 84, set up in the process of certain oil pressure, allow described actuator 30 within a certain period of time first fuel feeding open again described break 81, prevent that described break 81 is prior to described actuator 30 brake offs, and cause the mechanisms such as turntable to have the uncertain motion states such as slippery.
Further, described hydraulic control system also comprises oil supply system 90, described oil supply system 90 comprises metering pump 91, main valve 92, relief valve 94 and fuel tank 96, described the first actuator port C and the second actuator port D are the actuator port of main valve 92, described main valve 92 also comprises filler opening and return opening, described metering pump 91 is arranged between described filler opening and fuel tank 96, and described return opening and fuel tank are communicated with, and described relief valve 94 is connected between the outlet and described fuel tank 96 of described metering pump 91; The filler opening of described main valve 92 and oil outlet are all optionally communicated with the first actuator port C or the second actuator port D.Particularly, described main valve 92 is 3-position 4-way solenoid directional control valve, when main valve 92 is during in primary importance, metering pump 91 is given the first oil circuit 20 fuel feeding, when main valve 92 is positioned at the second place, metering pump 91 is given the 4th oil circuit 60 fuel feeding, when main valve 92 is positioned at meta, and the direct oil sump tank of metering pump 91 oil out.
Further, described proportional pressure-reducing valve 55 comprises electric control handle, and the aperture of described electric control handle is directly proportional to the delivery pressure of described proportional pressure-reducing valve 55, therefore can control by this electric control handle the delivery pressure of described proportional pressure-reducing valve 55.For reducing the anxious impact that stops bringing, when realizing the requiring of location, can make slowly electric ratio handle return, reduce hydraulic shock, realize the buffering while stopping; In the situation that needs are located, make handle returning quickly, the anxious stopping time is realized location fast.
When metering pump 91 is given the first oil circuit 20 fuel feeding, main valve 92 is in primary importance, i.e. left position shown in Fig. 2, and the filler opening of main valve 92 and described the first actuator port C are communicated with, the return opening of main valve 92 and described the second actuator port D are communicated with, and metering pump 91 is given the first oil circuit 20 fuel feeding.The second pressure of controlling mouthful (being the left end in Fig. 2) of described second switch valve 72 is greater than its first control mouthful (being the right-hand member in Fig. 2), the rest position of second switch valve 72 in left position, makes the pressure oil in the first oil circuit 20 lead to actuator 30 by the first proportional reversing valve 22.The pressure at the first one-way throttle valve 53a place is greater than the second one-way throttle valve 53b, make the first pressure of controlling mouth of the left end of selector valve 52 be greater than the pressure that second of right-hand member is controlled mouth, so selector valve 52 commutates to left position, the oil outlet of proportional pressure-reducing valve 55 is communicated with the control mouth of the first proportional reversing valve 22, the control mouth of the second proportional reversing valve 62 is communicated with fuel tank, the guide oil of pilot control 58 arrives the control mouth of the first proportional reversing valve 22 through proportional pressure-reducing valve 55, by changing the curtage (realizing by handling its electric control handle) of proportional pressure-reducing valve 55, change the delivery pressure of proportional pressure-reducing valve 55, thereby change the pressure on the control mouth that is applied to the first proportional reversing valve 22, the first proportional reversing valve 22 is controlled in from cut-off completely to the diverse location of conducting completely, and along with the pilot pressure being applied on the control mouth of the first proportional reversing valve 22 changes, also (minimum is zero to the respective change of the restriction size of the first proportional reversing valve 22, be full flow to the maximum), thereby realize stepless speed regulation.Simultaneously, first of the first switch valve 42 is controlled mouthful (being the left end shown in Fig. 2) owing to connecting with the first oil circuit 20, its pressure is greater than second of the first switch valve 42 and controls mouthful (being the right-hand member shown in Fig. 2), so the conduction position of the first switch valve 42 in left position, the fluid of actuator's 30 right-hand members is through the second oil circuit 40 oil returns.In addition, the high pressure oil of the first oil circuit 20 also enters break 81 through selector valve 82 and pilot operated directional control valve 84, and the braking of brake off device 81 allows actuator's 30 runnings.
When metering pump 91 is given the 4th oil circuit 60 fuel feeding, main valve 92 is in the second place, i.e. right position shown in Fig. 2, and the filler opening of main valve 92 and described the second actuator port D are communicated with, the return opening of main valve 92 and described the first actuator port C are communicated with, and metering pump 91 is given the 4th oil circuit 60 fuel feeding.The second pressure of controlling mouthful (being the right-hand member in Fig. 2) of described the first switch valve 42 is greater than its first control mouthful (being the left end in Fig. 2), the rest position of the first switch valve 42 in right position, makes the pressure oil in the 4th oil circuit 60 lead to actuator 30 by the second proportional reversing valve 62.The pressure at the second one-way throttle valve 53b place is greater than the first one-way throttle valve 53a, make the second pressure of controlling mouth of the right-hand member of selector valve 52 be greater than the pressure that first of left end is controlled mouth, so selector valve 52 commutates to right position, the oil outlet of proportional pressure-reducing valve 55 is communicated with the control mouth of the second proportional reversing valve 62, the control mouth of the first proportional reversing valve 22 is communicated with fuel tank, the guide oil of pilot control 58 arrives the control mouth of the second proportional reversing valve 62 through proportional pressure-reducing valve 55, by changing the curtage (realizing by handling its electric control handle) of proportional pressure-reducing valve 55, change the delivery pressure of proportional pressure-reducing valve 55, thereby change the pressure on the control mouth that is applied to the second proportional reversing valve 62, the second proportional reversing valve 62 is controlled in from cut-off completely to the diverse location of conducting completely, and along with the pilot pressure being applied on the control mouth of the second proportional reversing valve 62 changes, also (minimum is zero to the respective change of the restriction size of the second proportional reversing valve 62, be full flow to the maximum), thereby realize stepless speed regulation.Simultaneously, first of second switch valve 72 is controlled mouthful (being the right-hand member shown in Fig. 2) owing to connecting with the 4th oil circuit 60, its pressure is greater than second of second switch valve 72 and controls mouthful (being the left end shown in Fig. 2), so the conduction position of second switch valve 72 in right position, the fluid of actuator's 30 left ends is through the 3rd oil circuit 70 oil returns.In addition, the high pressure oil of the 4th oil circuit 60 also enters break 81 through selector valve 82 and pilot operated directional control valve 84, and the braking of brake off device 81 allows actuator's 30 runnings.
Utilize hydraulic control system of the present invention, adopt metering pump 91 can realize the stepless change of actuator 30, reduced to a certain extent cost.Can carry out by electric control handle the delivery pressure of control ratio reduction valve 55, make proportional reversing valve 22,62 be open at arbitrary position, corresponding proportional reversing valve 22,62 aperture minimum states during the minimum aperture of handle, corresponding proportional reversing valve 22,62 aperture maximum ratings during handle maximum opening, and the increase along with handle aperture, the aperture of proportional reversing valve 22,62 also increases gradually, realizes the stepless speed regulation to swirl gear, has simplified control mode.In actuator 30, start and the anxious stopping time, because the open degree of proportional reversing valve 22,62 has one from the large process of little change (being open time delay), can compensator or trimmer pressure, when opening completely, can accomplish again the output in full of flow, can too much not increase the pressure loss of whole oil circuit.Because proportional pressure-reducing valve 55 can adopt electric control handle, control, for reducing the anxious impact that stops bringing, when realizing the requiring of location, can make slowly electric ratio handle return, reduce hydraulic shock, realize the buffering while stopping; In the situation that needs are located, make handle returning quickly, the anxious stopping time is realized location fast.
In this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, except comprising those listed key elements, but also can comprise other key elements of clearly not listing.
In this article, the related noun of locality such as forward and backward, upper and lower is to be arranged in figure and component position each other defines with component in accompanying drawing, just clear and convenient for expression technology scheme.The use that should be appreciated that the described noun of locality should not limit the scope that the application asks for protection.
In this article, unless otherwise specifically indicated, otherwise, for sequence adjective " first ", " second " of describing element etc., be only used to distinguish similar elements, and the element that does not mean that such description must be according to given order, or time, space, grade or other restriction.
In the situation that not conflicting, the feature in above-described embodiment and embodiment can mutually combine herein.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. realize the infinite variable speed hydraulic control system of actuator for one kind, comprise metering pump (91), main valve (92), fuel tank (96), the first oil circuit (20), actuator (30), and second oil circuit (40), the filler opening of described metering pump (91) is connected with described fuel tank (96), described main valve (92) is connected with the oil outlet of described metering pump (91), described main valve (92) has the first actuator port (C) and the second actuator port (D), described the first oil circuit (20) connects one end of described the first actuator port (C) and described actuator (30), described the second oil circuit (40) connects the other end of described the second actuator port (D) and described actuator (30), it is characterized in that: described the first oil circuit (20) is provided with the first proportional reversing valve (22), described the second oil circuit (40) is provided with the first switch valve (42), described hydraulic control system also comprises speed Control oil circuit (50), described speed Control oil circuit (50) connects the control mouth of described the first proportional reversing valve (22), on described speed Control oil circuit (50), be connected with proportional pressure-reducing valve (55) and pilot control (58), described proportional pressure-reducing valve (55) is connected between the control mouth and described pilot control (58) of described the first proportional reversing valve (22), the guide oil of described pilot control (58) arrives the control mouth of described the first proportional reversing valve (22) through described proportional pressure-reducing valve (55), the pilot pressure that described proportional pressure-reducing valve (55) is controlled on the control mouth that is applied to described the first proportional reversing valve (22) gradually changes between lower limit and CLV ceiling limit value, described the first proportional reversing valve (22) is correspondingly controlled in cut-off and the completely diverse location between conducting completely.
2. hydraulic control system according to claim 1, it is characterized in that: described hydraulic control system also comprises three oil circuit (70) in parallel with described the first oil circuit (20) and four oil circuit (60) in parallel with described the second oil circuit (40), described the 3rd oil circuit (70) is provided with second switch valve (72), described the 4th oil circuit (60) is provided with the second proportional reversing valve (62), described speed Control oil circuit (50) also connects the control mouth of described the second proportional reversing valve (62), on described speed Control oil circuit (50), be also connected with selector valve (52), described selector valve (52) is connected with described proportional pressure-reducing valve (55), described selector valve (52) has two actuator ports, two actuator ports of described selector valve (52) are connected with the control mouth of described the second proportional reversing valve (62) with the control mouth of described the first proportional reversing valve (22) respectively.
3. hydraulic control system according to claim 2, it is characterized in that: described selector valve (52) is 3-position 4-way pilot operated directional control valve, described selector valve (52) has the first control mouth and second and controls mouth, first of described selector valve (52) is controlled mouth and is connected to described the first oil circuit (20) above and is connected between described the first proportional reversing valve (22) and described the first actuator port (C), second of described selector valve (52) is controlled mouth and is connected to described the 4th oil circuit (60) above and is connected between described the second proportional reversing valve (62) and described the second actuator port (D), the filler opening of described selector valve (52) is connected with the oil outlet of described proportional pressure-reducing valve (55), the return opening of described selector valve (52) is connected with fuel tank.
4. hydraulic control system according to claim 3, it is characterized in that: first of described selector valve (52) is controlled between mouth and described the first oil circuit (20) and is provided with the first one-way throttle valve (53a), second of described selector valve (52) is controlled between mouth and described the 4th oil circuit (60) and is provided with the second one-way throttle valve (53b), one-way valve in described the first one-way throttle valve (53a) allows fluid to flow to described the first oil circuit (20) from described selector valve (52), one-way valve in described the second one-way throttle valve (53b) allows fluid to flow to described the 4th oil circuit (60) from described selector valve (52).
5. hydraulic control system according to claim 2, it is characterized in that: described the first switch valve (42) and second switch valve (72) are 2/2-way hydraulic control valve, the second control mouthful that first of described the first switch valve (42) is controlled mouth and described second switch valve (72) is all connected with described the first oil circuit (20), and the second control of described the first switch valve (42) mouthful is all connected with described the 4th oil circuit (60) with the first control mouth of described second switch valve (72); Described in when described the first switch valve (42) is controlled the first state in cut-off or conducting, second switch valve (72) is controlled in the second contrary state.
6. hydraulic control system according to claim 5, it is characterized in that: the second control mouth that first of described the first switch valve (42) is controlled mouth and described second switch valve (72) is all connected to described the first oil circuit (20) above and is connected between described the first proportional reversing valve (22) and described the first actuator port (C), the first control mouth that second of described the first switch valve (42) is controlled mouth and described second switch valve (72) is all connected to described the 4th oil circuit (60) above and is connected between described the second proportional reversing valve (62) and described the second actuator port (D).
7. according to the hydraulic control system described in any one in claim 1-6, it is characterized in that: described hydraulic control system also comprises the first one-way valve (23a), the second one-way valve (23b) and relief valve (24), in parallel with described actuator (30) again after described the first one-way valve (23a) and the second one-way valve (23b) series connection, the filler opening of described relief valve (24) is connected between the first one-way valve (23a) and the second one-way valve (23b), the oil outlet of described relief valve (24) connects fuel tank, described the first one-way valve (23a) is installed in the mode that allows fluid to flow to described relief valve (24) from described the first oil circuit (20), described the second one-way valve (23a) is installed in the mode that allows fluid to flow to described relief valve (24) from described the 4th oil circuit (60).
8. hydraulic control system according to claim 7, it is characterized in that: described hydraulic control system also comprises the 3rd one-way valve (25a) and the 4th one-way valve (25b), in parallel with described actuator (30) again after described the 3rd one-way valve (25a) and the series connection of the 4th one-way valve (25b), fuel tank is connected between described the 3rd one-way valve (25a) and the 4th one-way valve (25b), described the 3rd one-way valve (25a) is installed in the mode that allows fluid to flow to described the first oil circuit (20) from fuel tank, described the 4th one-way valve (25b) is installed in the mode that allows fluid to flow to described the 4th oil circuit (60) from fuel tank.
9. according to the hydraulic control system described in any one in claim 1-6, it is characterized in that: described hydraulic control system also comprises brake circuit (80), described brake circuit (80) is provided with break (81) and selector valve (82), the filler opening of described selector valve (82) is connected with described the 4th oil circuit (60) with described the first oil circuit (20), the oil outlet of described selector valve (82) is connected with the oil pocket of described break (81), and described selector valve (82) is alternatively communicated with described the first oil circuit (20) or described the 4th oil circuit (60).
10. according to the hydraulic control system described in any one in claim 1-6, it is characterized in that: described proportional pressure-reducing valve (55) comprises electric control handle, the aperture of described electric control handle is directly proportional to the delivery pressure of described proportional pressure-reducing valve (55).
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| CN104291214A (en) * | 2014-08-26 | 2015-01-21 | 上海港怡动力系统有限公司 | Remote control grab bucket capable of discharging in stable mode |
| CN104343433A (en) * | 2014-10-31 | 2015-02-11 | 山河智能装备股份有限公司 | Full-hydraulic adaptive coupling control loop for rotation and propelling of rock drilling machine and control method |
| CN104389579A (en) * | 2014-10-31 | 2015-03-04 | 山河智能装备股份有限公司 | Rotating and boosting EHC (Electric Hydraulic Control) method of rock drilling machine and control circuit for realizing rotating and boosting EHC method |
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| CN108302079A (en) * | 2018-04-04 | 2018-07-20 | 徐工集团工程机械股份有限公司科技分公司 | A kind of gearbox dynamic output control system and control method |
| CN108302079B (en) * | 2018-04-04 | 2023-08-11 | 徐工集团工程机械股份有限公司科技分公司 | Gearbox power output control system and control method |
| CN109798271A (en) * | 2019-01-31 | 2019-05-24 | 江苏佳煤机械有限公司 | A kind of shovel board raise-lower hydraulic control integrated valve block and continuous miner |
| CN109809311A (en) * | 2019-01-31 | 2019-05-28 | 武汉船用机械有限责任公司 | The Hydraulic slewing system and crane of crane |
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| CN111664135A (en) * | 2020-04-23 | 2020-09-15 | 武汉船用机械有限责任公司 | Hydraulic system of gear rack lifting platform |
| CN112145490A (en) * | 2020-09-03 | 2020-12-29 | 四川宏华石油设备有限公司 | Automatic control system for catwalk sliding shoes |
| CN112145490B (en) * | 2020-09-03 | 2022-01-11 | 四川宏华石油设备有限公司 | Automatic control system for catwalk sliding shoes |
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