CN104929999A - Full-hydraulic driving control system - Google Patents
Full-hydraulic driving control system Download PDFInfo
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- CN104929999A CN104929999A CN201510366049.3A CN201510366049A CN104929999A CN 104929999 A CN104929999 A CN 104929999A CN 201510366049 A CN201510366049 A CN 201510366049A CN 104929999 A CN104929999 A CN 104929999A
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- 239000003921 oil Substances 0.000 claims description 157
- 238000013016 damping Methods 0.000 claims description 97
- 230000003139 buffering effect Effects 0.000 claims description 40
- 239000012530 fluid Substances 0.000 claims description 39
- 239000010720 hydraulic oil Substances 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 17
- 239000013589 supplement Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000003032 molecular docking Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a full-hydraulic driving control system. The full-hydraulic driving control system comprises a hydraulic motor, a hydraulic pump, a brake and an air pump. The brake controls a switching valve in a pedal pressing manner, the air pump is connected to the switching valve through an air passage, and the hydraulic pump is equipped with an operation valve. The full-hydraulic driving control system also comprises a full-hydraulic driving integrated valve. A balance valve provided with a damper, a one-way throttle valve set provided with detachable dampers, a buffer unloading valve set, a large-diameter oil supplement valve, a reversing valve and a high-pressure selector valve are integrally assembled in the valve body of the full-hydraulic driving integrated valve. The valve body of the full-hydraulic driving integrated valve is at least provided with an A1 port and a B1 port which are used for connecting the hydraulic motor, an A port and a B port which are used for connecting the operation valve, and a C port, an MU port, a T port and a K port which are used for connecting the switching valve. According to the invention, problems that the hydraulic impact is large, oil is fully absorbed, and the noise is loud in a braking process of a full-hydraulic wheel excavator and a loader can be effectively solved, and the system is wild in vehicle starting and stopping, is safe and energy-saving, and is high in controllability.
Description
Technical field
The present invention relates to the hydraulic control technology of engineering machinery, in particular for a kind of hydraulic moving control system of hydraulic moving wheel excavator, loader, specifically a kind of all-hydraulic traveling control system.
Background technique
What current most wheel excavator and loader adopted is all machine-walking pattern, and both tire passed through ransaxle, gearbox etc. by diesel engine Direct driver.Because it exists large, the handling shortcoming such as bad of energy consumption, therefore producer is all in the controlling method of seeking a kind of all-hydraulic walking pattern both at home and abroad, and all-hydraulic walking had both adopted variable piston motor to carry out the pattern of tire on the drive wheels walking by ransaxle.But in prior art, because the combination lacking respective valve in all-hydraulic traveling control system controls, thus also following problem is easily caused: one is that hydraulic system is separated completely with mechanical braking sytem in equipment docking process, causes the parking poor stability of equipment.Two is cause in brake (parkings) process that hydraulic shock is large, fluid inhales sky and noise is large.Above Problems existing not only reduces the maneuverability of system, but also leaves very large potential safety hazard can to excavator or loader, causes the development of current all hydraulic wheel type excavator and loader to receive very large impact.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned prior art present situation, and provides and start soft, the energy-saving safe of stopping, handling good and motor hydraulic pressure can be avoided to inhale the empty all-hydraulic traveling control system of one.
The present invention solves the problems of the technologies described above adopted technological scheme: all-hydraulic traveling control system, comprise for the oil hydraulic motor of hoofing part and provide the oil hydraulic pump of hydraulic power for oil hydraulic motor, and break and air pump, break trampling controls there is switching valve, air pump is connected with switching valve through gas circuit, and oil hydraulic pump is furnished with control valve; The all-hydraulic walking integrated valve by height integrated formation small-sized hydraulic system control unit is also provided with in all-hydraulic traveling control system, in the valve body of this all-hydraulic walking integrated valve, integrated being assembled with is with the equilibrium valve of damping, the one-way throttle valve group with detachable damping, buffering unloading valve group, heavy caliber Fill valve, selector valve and high selector relay, and the valve body of all-hydraulic walking integrated valve is at least shaped with A1 mouth for connecting fluid pressure motor with B1 mouth, for being connected the A mouth of control valve with B mouth, for being connected C mouth and MU mouth, T mouth and the K mouth of switching valve.
For optimizing technique scheme, the measure taked also comprises:
Above-mentioned control valve is 3-position 4-way control valve, and the pump hydraulic fluid port of oil hydraulic pump is connected with the first port of control valve, and the second port of this control valve is connected with oil sump tank, and the third connectivity mouth of control valve is communicated with A mouth, and the 4th port of control valve is communicated with B mouth; The hydraulic tubing of oil hydraulic pump connection control valve is provided with unloading valve.
Above-mentioned switching valve is two-position three-way switching valve, the compressed air outlet of air pump is connected with the first ventilating hole of switching valve, second ventilating hole of switching valve is air vent, 3rd ventilating hole of this switching valve is connected with C mouth, and the pressurized air that air pump pumps is trampled after switching valve switches at break and promoted selector valve slip commutation integrated in all-hydraulic walking integrated valve through switching valve and C implication successively; In gas circuit between this air pump connection switching valve, safety air release valve is installed.
Above-mentioned heavy caliber Fill valve is made up of the first bore one-way valve be oppositely arranged and second largest bore one-way valve; The public oil inlet end of first bore one-way valve and second largest bore one-way valve is communicated with oil feeding reservoir through MU mouth, and the oil outlet end of first bore one-way valve is communicated with A1 mouth, and the oil outlet end of second largest bore one-way valve is connected with B1 mouth.
Above-mentioned selector valve is two two logical selector valves, first hydraulic fluid port of this selector valve communicates with A1 mouth, second hydraulic fluid port of selector valve communicates with B1 mouth, and when pressurized air that air pump pumps promotes selector valve commutation, A1 mouth and B1 mouth are interconnected through the first hydraulic fluid port of selector valve and the second hydraulic fluid port; Selector valve has the drain tap preventing from affecting selector valve cracking pressure in hydraulic fluid leak to selector valve valve pocket, and this drain tap is connected with oil sump tank through T mouth.
Above-mentioned buffering unloading valve group be included in when oil hydraulic motor transfers pump condition to by motor operating conditions for cushion the high pressure oil that off-load A1 mouth produces the first buffering unloading valve and when oil hydraulic motor is transferred to pump condition by motor operating conditions for cushioning the second buffering unloading valve of the high pressure oil that off-load B1 mouth produces, first pressure oil port of the first buffering unloading valve communicates with A1 mouth, first off-load hydraulic fluid port of this first buffering unloading valve communicates with B1 mouth, second pressure oil port of the second buffering unloading valve communicates with B1 mouth, and the second off-load hydraulic fluid port of this second buffering unloading valve communicates with A1 mouth; First buffering unloading valve and the second buffering unloading valve are set up in parallel the two-stage buffering unloading valve constituting control system.
The equilibrium valve of above-mentioned band damping is the 3-position 4-way equilibrium valve being processed with guide oil damping hole in balance valve core, and guide oil damping hole comprises left guide oil damping hole and right guide oil damping hole; First balance valve of the equilibrium valve of this band damping is connected with A mouth, second balance valve of the equilibrium valve with damping is connected with B mouth, 3rd balance valve of the equilibrium valve with damping is connected with A1, and the 4th balance valve of the equilibrium valve of band damping is connected with B1 mouth; Left guide's hydraulic fluid port of the equilibrium valve with damping is connected with A mouth, and right guide's hydraulic fluid port of the equilibrium valve of band damping is connected with B mouth.
The one-way throttle valve group of the detachable damping of above-mentioned band comprises hydraulic channel between energy one-way conduction A mouth to A1 mouth and the hydraulic oil that oil hydraulic pump exports is delivered to the one-way throttle valve of the detachable damping of the first band of oil hydraulic motor, and between energy one-way conduction B mouth to B1 mouth, the hydraulic oil that oil hydraulic pump exports is delivered to the one-way throttle valve of the detachable damping of the second band of oil hydraulic motor by hydraulic channel; First is with the one-way throttle valve of the one-way throttle valve of detachable damping and the detachable damping of the second band to be arranged in the spool of one-way valve the replaceable damping carrying out changing can be needed to form according to system damping size by one-way valve and employing spiral way.
The center control port of above-mentioned high selector relay is interlinked by the first damping and K mouth, and the left control port of this high selector relay is connected with A mouth, and the right control port of high selector relay is connected with B mouth.
Above-mentioned all-hydraulic walking integrated valve is also processed with for exporting the Ma mouth and Mb mouth that control oil, and Ma mouth is connected with A mouth, and Mb mouth is connected with B mouth.
Advantage and the beneficial effect thereof of control system of the present invention are as follows:
1, Operation system setting has K mouth, Ma mouth, Mb mouth and high selector relay, quotes high pressure oil provide conveniently as control oil needs.
2, the equilibrium valve being provided with band damping in system makes system more steady in handoff procedure, avoid the compression shock of hydraulic pressure, by being with the equilibrium valve of damping to combinationally use with the one-way throttle valve group of the detachable damping of band in simultaneity factor, the pressure vibration problem that systematic evaluation causes can be eliminated further.
3, be provided with the two-stage be made up of the first buffering unloading valve and the second buffering unloading valve in system and cushion unloading valve; can better protect system oil-way; particularly in startup and stopped process, effectively can weaken pressure peak, make whole system stability better.
4, the heavy caliber Fill valve of the present invention by arranging in system, thoroughly can solve the confession shortage of oil problem occurred in the process that oil hydraulic motor changes to pump condition at motor operating conditions, thus avoid the emptying phenomenon of oil hydraulic motor.
5, control system of the present invention adopts the mechanical brake on switching valve and vehicle to link, when brake stops, selector valve can promote to commutate down by the pressurized air of air pump again, realize the directly through of A1 mouth and B1 mouth, thus whole docking process can be made more steady, and the fluid well avoiding oil hydraulic motor inhales empty problem.
Accompanying drawing explanation
Fig. 1 is hydraulic principle schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
Fig. 1 is hydraulic principle schematic diagram of the present invention.
Reference character is wherein: all-hydraulic walking integrated valve F, air pump Q, oil hydraulic motor M, safety air release valve N, unloading valve X, oil hydraulic pump Y, break Z, switching valve 1, control valve 2, equilibrium valve 3 with damping, left guide oil damping hole 3a, right guide oil damping hole 3b, the one-way throttle valve 41 of the detachable damping of the first band, the one-way throttle valve 42 of the detachable damping of the second band, first buffering unloading valve 51, second buffering unloading valve 52, heavy caliber Fill valve 6, first bore one-way valve 61, second bore one-way valve 62, selector valve 7, high selector relay 8, first damping 81.
As shown in Figure 1, all-hydraulic traveling control system of the present invention, comprise for the oil hydraulic motor M of hoofing part and provide the oil hydraulic pump Y of hydraulic power for oil hydraulic motor M, and break Z and air pump Q, rotate under the effect of the hydraulic oil that oil hydraulic motor M pumps at oil hydraulic pump Y, oil hydraulic motor M is rotary actuation wheel excavator or loader again, to realize the all-hydraulic walking mode of wheel excavator or loader, break Z be wheel excavator or loader stop or brake time the mechanical braking parts that use, break Z adopts the foot-operated mode jammed on to control, break Z trampling controls there is switching valve 1, air pump Q is connected with switching valve 1 through gas circuit, oil hydraulic pump Y is furnished with control valve 2, the all-hydraulic walking integrated valve F by height integrated formation small-sized hydraulic system control unit is also provided with in all-hydraulic traveling control system, in the valve body of this all-hydraulic walking integrated valve F, integrated being assembled with is with the equilibrium valve 3 of damping, the one-way throttle valve group with detachable damping, buffering unloading valve group, heavy caliber Fill valve 6, selector valve 7 and high selector relay 8, and the valve body of all-hydraulic walking integrated valve F is at least shaped with A1 mouth for connecting fluid pressure motor M with B1 mouth, for being connected the A mouth of control valve 2 with B mouth, for being connected C mouth and MU mouth, T mouth and the K mouth of switching valve 1.Main hydraulic pressure runner and auxiliary oil channel is also processed with, to ensure to be integrated in the connection needs between each corresponding valve in valve body or between its corresponding connection mouth of each valve in the valve body of all-hydraulic walking integrated valve F.
Control valve 2 is 3-position 4-way control valve, and the pump hydraulic fluid port of oil hydraulic pump Y is connected with the first port of control valve 2, and the second port of this control valve 2 is connected with oil sump tank, and the third connectivity mouth of control valve 2 is communicated with A mouth, and the 4th port of control valve 2 is communicated with B mouth.As can be seen from Figure 1, when control valve 2 is in meta, A mouth and B mouth are all communicated with oil sump tank through the second port of control valve 2, and the pump hydraulic fluid port of oil hydraulic pump Y is now in turnoff state, i.e. the state of fuel cut-off.When control valve 2 is in left position, the pump hydraulic fluid port of oil hydraulic pump Y is then communicated with A mouth through control valve 2, and B mouth then connects oil sump tank through the second port, when control valve 2 is in right position, the pump hydraulic fluid port of oil hydraulic pump Y is then communicated with B mouth through control valve 2, and A mouth then connects oil sump tank through the second port.The present invention can change the hydraulic oil that oil hydraulic pump Y pumps supplier by the left and right action of control valve 2 to, thus forward and reverse rotation of oil hydraulic motor M can be realized, with the needs of the advance or retrogressing that realize wheel excavator and loader.In order to improve the Security of system; the hydraulic tubing of oil hydraulic pump Y connection control valve 2 is provided with and prevents the too high unloading valve X be without prejudice with element each in protective system of system hydraulic pressure; hydraulic pressure is too high exceed the value of setting time, hydraulic oil can directly flow back in oil sump tank after unloading valve X off-load.
Switching valve 1 in this control system is two-position three-way switching valve, the compressed air outlet of air pump Q is connected with the first ventilating hole of switching valve 1, second ventilating hole of switching valve 1 is air vent, 3rd ventilating hole of this switching valve 1 is connected with C mouth, and the pressurized air that air pump Q pumps is trampled after switching valve 1 switches at break Z and promoted selector valve 7 slip commutation integrated in all-hydraulic walking integrated valve F through switching valve 1 and C implication successively; In gas circuit between this air pump Q connection switching valve 1, safety air release valve N is installed.As can be seen from Figure 1, under normal shape, C mouth is communicated with the second ventilating hole through the 3rd ventilating hole of switching valve 1, thus connection external ambient atmosphere, now the first ventilating hole of switching valve 1 is then off state, when break Z tramples braking, the push rod of break Z can promote switching valve 1 action commutation, first ventilating hole of switching valve 1 is communicated with the 3rd ventilating hole of switching valve 1, thus make pressurized air can enter C mouth through switching valve 1, promote selector valve 7 action in pneumatic mode, thus achieve the commutation of selector valve 7.The air flue being communicated with selector valve 7 and C mouth is processed with in the valve body of all-hydraulic walking integrated valve F.In order to ensure that air pump Q can normally work, prevent that air pressure is too high causes danger or infringement equipment, the safety air release valve N that can ensure Security is installed in gas circuit.
Equilibrium valve 3 with damping in native system is the 3-position 4-way equilibrium valve being processed with guide oil damping hole in balance valve core, left guide's oil pocket that the balance valve core that equilibrium valve 3 with damping is formed with the equilibrium valve 3 of energy push belt damping moves right and right guide's oil pocket that promotion balance valve core moves right, above-mentioned guide oil damping hole is included in the left guide oil damping hole 3a of the connection that balance valve core is shaped with left guide oil pocket and is communicated with the right guide oil damping hole 3b of right guide's oil pocket; First balance valve of the equilibrium valve 3 of this band damping is connected with A mouth, second balance valve of the equilibrium valve 3 with damping is connected with B mouth, 3rd balance valve of the equilibrium valve 3 with damping is connected with A1, and the 4th balance valve of the equilibrium valve 3 of band damping is connected with B1 mouth; Left guide's hydraulic fluid port of the equilibrium valve 3 with damping is connected with A mouth, and right guide's hydraulic fluid port of the equilibrium valve 3 of band damping is connected with B mouth.Equilibrium valve 3 with damping can make system more steady in handoff procedure, avoids the compression shock of hydraulic pressure, ensure that the soft smoothness that system starts and stops.Can see from Fig. 1 of the present invention, when being with the equilibrium valve 3 of damping to mediate, first balance valve, the second balance valve, the 3rd balance valve, the 4th balance valve are off state, when being with the equilibrium valve 3 of damping to be in left position, now the 4th balance valve is communicated with the second balance valve, makes oil hydraulic motor M be in the equilibrium valve 3 of the pressure oil energy band damping of B1 mouth, B mouth and control valve 2 and gets back in oil sump tank.When being with the equilibrium valve 3 of damping to be in right position, equilibrium valve 3 and control valve 2 now by being with damping can make the pressure oil of A1 mouth flow back in oil sump tank.
One-way throttle valve group with detachable damping in native system comprises hydraulic channel between energy one-way conduction A mouth to A1 mouth and the hydraulic oil that oil hydraulic pump Y exports is delivered to the one-way throttle valve 41 of the detachable damping of the first band of oil hydraulic motor M, and between energy one-way conduction B mouth to B1 mouth, the hydraulic oil that oil hydraulic pump Y exports is delivered to the one-way throttle valve 42 of the detachable damping of the second band of oil hydraulic motor M by hydraulic channel; First is with the one-way throttle valve 41 of detachable damping and the one-way throttle valve 42 of the detachable damping of the second band to be arranged in the spool of one-way valve the replaceable damping carrying out changing can be needed to form according to system damping size by one-way valve and employing spiral way.By being with the equilibrium valve of damping to combinationally use with the one-way throttle valve group of the detachable damping of band in system of the present invention, the pressure vibration problem that systematic evaluation causes can be eliminated further.
Heavy caliber Fill valve 6 of the present invention is made up of the first bore one-way valve 61 be oppositely arranged and second largest bore one-way valve 62; Heavy caliber one-way valve can better work the effect of falling repairing, prevents oil hydraulic motor M from inhaling empty.The public oil inlet end of first bore one-way valve 61 and second largest bore one-way valve 62 is communicated with oil feeding reservoir through MU mouth, and the oil outlet end of first bore one-way valve 61 is communicated with A1 mouth, and the oil outlet end of second largest bore one-way valve 62 is connected with B1 mouth.As shown in Figure 1, when there is negative pressure in the A1 mouth of oil hydraulic motor M, hydraulic oil now in oil feeding reservoir can through the repairing of first bore one-way valve 61, and when negative pressure appears in the B1 mouth of oil hydraulic motor M, the hydraulic oil now in oil feeding reservoir can through the repairing of second largest bore one-way valve 62.The present invention is provided with bigbore Fill valve, thoroughly can solve the confession shortage of oil problem occurred in the process that oil hydraulic motor M changes to pump condition at motor operating conditions, thus avoid the emptying phenomenon of oil hydraulic motor M.
Selector valve 7 is two two logical selector valves, first hydraulic fluid port of this selector valve 7 communicates with A1 mouth, second hydraulic fluid port of selector valve 7 communicates with B1 mouth, and pressurized air that air pump Q pumps promotes selector valve 7 when commutating, and A1 mouth and B1 mouth are interconnected through the first hydraulic fluid port of selector valve 7 and the second hydraulic fluid port; Selector valve 7 has the drain tap preventing from affecting selector valve 7 cracking pressure in hydraulic fluid leak to selector valve 7 valve pocket, and this drain tap is connected with oil sump tank through T mouth.Control system of the present invention adopts switching valve 1 to link with the mechanical brake Z on vehicle, when break Z Brake stop, selector valve 1 can promote to commutate down by the pressurized air of air pump Q again, realize the directly through of A1 mouth and B1 mouth, thus whole docking process can be made more steady, and the fluid well avoiding oil hydraulic motor M inhales empty problem.
Buffering unloading valve group of the present invention be included in when oil hydraulic motor transfers pump condition to by motor operating conditions for cushion the high pressure oil that off-load A1 mouth produces the first buffering unloading valve 51 and when oil hydraulic motor is transferred to pump condition by motor operating conditions for cushioning the second buffering unloading valve 52 of the high pressure oil that off-load B1 mouth produces, first pressure oil port of the first buffering unloading valve 51 communicates with A1 mouth, first off-load hydraulic fluid port of this first buffering unloading valve 51 communicates with B1 mouth, second pressure oil port of the second buffering unloading valve 52 communicates with B1 mouth, second off-load hydraulic fluid port of this second buffering unloading valve 52 communicates with A1 mouth, first buffering unloading valve 51 and the second buffering unloading valve 52 are set up in parallel the two-stage buffering unloading valve constituting control system.Be provided with the two-stage be made up of the first buffering unloading valve and the second buffering unloading valve in system of the present invention and cushion unloading valve; can better protect system oil-way; particularly in startup and stopped process, effectively can weaken pressure peak, make whole system stability better.
All-hydraulic walking integrated valve F is also processed with for exporting the Ma mouth and Mb mouth that control oil, Ma mouth is connected with A mouth, Mb mouth is connected with B mouth, the center control port of high selector relay 8 is interlinked with K mouth by the first damping 81, the left control port of this high selector relay 8 is connected with A mouth, and the right control port of high selector relay 8 is connected with B mouth.Operation system setting has K mouth, Ma mouth, Mb mouth and high selector relay, can quote high pressure oil provide conveniently as control oil needs.
Control principle of the present invention is as follows:
When 1, starting when the left position of control valve 2 is switched to working position, oil hydraulic pump Y hydraulic oil out enters the A mouth of all-hydraulic walking integrated valve F by the left position of control valve 2, hydraulic oil enters into the A1 mouth of oil hydraulic motor M through the one-way throttle valve 41 that the inner flow passage of all-hydraulic walking integrated valve F pushes the detachable damping of the first band open, promotes oil hydraulic motor M and rotates; The left guide oil damping hole 3a of the equilibrium valve 3 of a part of hydraulic oil band damping enters left guide's oil pocket simultaneously, promotes balance valve core and moves right, make the left position of the equilibrium valve 3 of band damping be in working position.Promote the hydraulic oil after oil hydraulic motor M rotary work by B1 mouth, then get back to the B mouth of all-hydraulic walking integrated valve F through the left position of the equilibrium valve 3 of band damping, get back to fuel tank by control valve 2.Owing to being provided with guide oil damping hole in system, therefore the movement of balance valve core is slightly later than oil hydraulic motor M rotary work, makes the pressure that the hydraulic energy of B1 mouth keeps certain, thus the stationarity that the system that ensure that starts, and mildness.When being switched to working position when the right position of control valve 2, it is identical when its working principle and the left position of control valve 2 are switched to working position, time different oil inlet and oil return move towards different, the sense of rotation of oil hydraulic motor M is different, thus makes wheel excavator and load function advance or retreat.
2, advance middle braking time: control valve 2 returns to meta, control valve 2 when meta because A mouth is also connected with oil sump tank, left guide's oil pocket of the equilibrium valve 3 therefore with damping also makes thrust because oil sump tank connects, balance valve core is caused also to return to meta, now A1 and A mouth and B1 mouth and B mouth oil circuit under first is with the one-way throttle valve 41 of detachable damping and second is with the one-way throttle valve 42 of detachable damping to act on is cut off, and now has two kinds of situations:
A, mechanical brake Z does not step down: hydraulic oil is under the effect of balance valve core with the one-way throttle valve group of the detachable damping of band, A1 mouth and the B1 mouth oil circuit of oil hydraulic motor M are closed, oil hydraulic motor M is due to rotator inertia, oil hydraulic motor M is converted to pump condition by motor operating conditions, now the B1 degree of lip-rounding becomes hyperbaric chamber, under the effect of hyperbaric chamber, oil hydraulic motor M stops slowly, in this process, partial high pressure oil is by the second buffering unloading valve 52 off-load, simultaneity factor carries out repairing by the first bore one-way valve 61 of MU mouth and heavy caliber Fill valve 6 to A1 mouth, oil circuit is avoided to inhale empty.
B, mechanical brake steps down: hydraulic oil is under the effect of balance valve core with the one-way throttle valve group of the detachable damping of band, the A1 mouth of oil hydraulic motor M and B1 mouth oil circuit and A mouth and B mouth disconnect, oil hydraulic motor M is due to rotator inertia, oil hydraulic motor M is converted to pump condition by motor operating conditions, after mechanical brake Z steps down, switching valve 1 starts commutation, the pressurized air of air pump Q promotes selector valve 7 by C mouth and commutates, now the A1 mouth of oil hydraulic motor M and B1 mouth are directly connected, under the effect of mechanical brake Z, oil hydraulic motor M stops slowly, in this process, high pressure oil can not be formed, simultaneity factor carries out repairing by the first bore one-way valve 61 of MU mouth and heavy caliber Fill valve 6 to A1 mouth, oil circuit is avoided to inhale empty.
3, stop: after a stoppage, under the equilibrium valve 3 of band damping and the one-way throttle valve group effect of the detachable damping of band, the A1 mouth of oil hydraulic motor M and the oil circuit of B1 mouth are cut off whole loom, what can ensure that whole loom can be very stable is parked in original place.
4, to advance middle descending: in this process, combinationally using of the equilibrium valve 3 of band damping and the one-way throttle valve group of the detachable damping of band, can the rotational speed of effective hydraulic control motor M, guarantees that oil hydraulic motor M does not exceed the speed limit, does not inhale sky.
Claims (10)
1. all-hydraulic traveling control system, comprise for the oil hydraulic motor (M) of hoofing part and provide the oil hydraulic pump (Y) of hydraulic power for oil hydraulic motor (M), and break (Z) and air pump (Q), it is characterized in that: described break (Z) trampling controls there is switching valve (1), described air pump (Q) is connected with switching valve (1) through gas circuit, and described oil hydraulic pump (Y) is furnished with control valve (2), the all-hydraulic walking integrated valve (F) by height integrated formation small-sized hydraulic system control unit is also provided with in all-hydraulic traveling control system, the integrated equilibrium valve (3) being assembled with band damping in the valve body of this all-hydraulic walking integrated valve (F), with the one-way throttle valve group of detachable damping, buffering unloading valve group, heavy caliber Fill valve (6), selector valve (7) and high selector relay (8), and the valve body of all-hydraulic walking integrated valve (F) is at least shaped with A1 mouth for connecting fluid pressure motor (M) and B1 mouth, for connecting A mouth and the B mouth of control valve (2), for connecting C mouth and the MU mouth of switching valve (1), T mouth and K mouth.
2. all-hydraulic traveling control system according to claim 1, it is characterized in that: described control valve (2) is 3-position 4-way control valve, the pump hydraulic fluid port of described oil hydraulic pump (Y) is connected with the first port of control valve (2), second port of this control valve (2) is connected with oil sump tank, the third connectivity mouth of described control valve (2) is communicated with A mouth, and the 4th port of control valve (2) is communicated with B mouth; The hydraulic tubing that described oil hydraulic pump (Y) connects control valve (2) is provided with unloading valve (X).
3. all-hydraulic traveling control system according to claim 1, it is characterized in that: described switching valve (1) is two-position three-way switching valve, the compressed air outlet of described air pump (Q) is connected with the first ventilating hole of switching valve (1), second ventilating hole of described switching valve (1) is air vent, 3rd ventilating hole of this switching valve (1) is connected with C mouth, the pressurized air that described air pump (Q) pumps is trampled after switching valve (1) switches at break (Z) and is promoted selector valve (7) slip commutation integrated in all-hydraulic walking integrated valve (F) through switching valve (1) and C implication successively, this air pump (Q) connects in the gas circuit between switching valve (1) and is provided with safety air release valve (N).
4. all-hydraulic traveling control system according to claim 1, is characterized in that: described heavy caliber Fill valve (6) is made up of the first bore one-way valve (61) be oppositely arranged and second largest bore one-way valve (62); The public oil inlet end of described first bore one-way valve (61) and second largest bore one-way valve (62) is communicated with oil feeding reservoir through MU mouth, the oil outlet end of described first bore one-way valve (61) is communicated with A1 mouth, and the oil outlet end of described second largest bore one-way valve (62) is connected with B1 mouth.
5. all-hydraulic traveling control system according to claim 1, it is characterized in that: described selector valve (7) is two two logical selector valves, first hydraulic fluid port of this selector valve (7) communicates with A1 mouth, second hydraulic fluid port of selector valve (7) communicates with B1 mouth, when pressurized air that described air pump (Q) pumps promotes selector valve (7) commutation, A1 mouth and B1 mouth are interconnected through the first hydraulic fluid port of selector valve (7) and the second hydraulic fluid port; Described selector valve (7) has the drain tap preventing from affecting selector valve (7) cracking pressure in hydraulic fluid leak to selector valve (7) valve pocket, and this drain tap is connected with oil sump tank through T mouth.
6. all-hydraulic traveling control system according to claim 1, it is characterized in that: described buffering unloading valve group be included in when oil hydraulic motor transfers pump condition to by motor operating conditions for cushion the high pressure oil that off-load A1 mouth produces the first buffering unloading valve (51) and when oil hydraulic motor is transferred to pump condition by motor operating conditions for cushioning the second buffering unloading valve (52) of the high pressure oil that off-load B1 mouth produces, first pressure oil port of the first described buffering unloading valve (51) communicates with A1 mouth, first off-load hydraulic fluid port of this first buffering unloading valve (51) communicates with B1 mouth, second pressure oil port of the second described buffering unloading valve (52) communicates with B1 mouth, second off-load hydraulic fluid port of this second buffering unloading valve (52) communicates with A1 mouth, the first described buffering unloading valve (51) and the second buffering unloading valve (52) are set up in parallel the two-stage buffering unloading valve constituting control system.
7. all-hydraulic traveling control system according to claim 1, it is characterized in that: the equilibrium valve (3) of described band damping is for being processed with the 3-position 4-way equilibrium valve of guide oil damping hole in balance valve core, described guide oil damping hole comprises left guide oil damping hole (3a) and right guide oil damping hole (3b); First balance valve of the equilibrium valve (3) of this band damping is connected with A mouth, second balance valve of the equilibrium valve (3) with damping is connected with B mouth, 3rd balance valve of the equilibrium valve (3) of described band damping is connected with A1, and the 4th balance valve of the equilibrium valve (3) of band damping is connected with B1 mouth; Left guide's hydraulic fluid port of the equilibrium valve (3) of described band damping is connected with A mouth, and right guide's hydraulic fluid port of the equilibrium valve (3) of described band damping is connected with B mouth.
8. all-hydraulic traveling control system according to claim 1, it is characterized in that: the one-way throttle valve group of the detachable damping of described band comprises hydraulic channel between energy one-way conduction A mouth to A1 mouth and the hydraulic oil that oil hydraulic pump (Y) exports is delivered to the one-way throttle valve (41) of the detachable damping of the first band of oil hydraulic motor (M), and between energy one-way conduction B mouth to B1 mouth, the hydraulic oil that oil hydraulic pump (Y) exports is delivered to the one-way throttle valve (42) of the detachable damping of the second band of oil hydraulic motor (M) by hydraulic channel; Described first is with the one-way throttle valve (42) of the one-way throttle valve (41) of detachable damping and the detachable damping of the second band to be arranged in the spool of one-way valve the replaceable damping carrying out changing can be needed to form according to system damping size by one-way valve and employing spiral way.
9. all-hydraulic traveling control system according to claim 1, it is characterized in that: the center control port of described high selector relay (8) is interlinked by the first damping (81) and K mouth, the left control port of this high selector relay (8) is connected with A mouth, and the right control port of high selector relay (8) is connected with B mouth.
10. all-hydraulic traveling control system according to claim 1, it is characterized in that: described all-hydraulic walking integrated valve (F) is also processed with for exporting the Ma mouth and Mb mouth that control oil, described Ma mouth is connected with A mouth, and described Mb mouth is connected with B mouth.
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| CN201510366049.3A CN104929999B (en) | 2015-06-29 | 2015-06-29 | Full-hydraulic driving control system |
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| CN201510366049.3A CN104929999B (en) | 2015-06-29 | 2015-06-29 | Full-hydraulic driving control system |
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| CN105909578A (en) * | 2016-06-02 | 2016-08-31 | 江苏大学 | Hydraulic system of stern operation platform |
| CN106321536A (en) * | 2016-11-08 | 2017-01-11 | 江苏柳工机械有限公司 | Self-walking shears-fork type high-altitude operation platform walking hydraulic system |
| CN110043523A (en) * | 2018-01-17 | 2019-07-23 | 雷沃重工股份有限公司 | Prevent that being emptied hydraulic system and hydraulic system prevents being emptied method |
| CN110593345A (en) * | 2019-09-24 | 2019-12-20 | 符鹏 | Rotation buffering device for excavator |
| CN110671496A (en) * | 2019-10-16 | 2020-01-10 | 福建晋工机械有限公司 | Automatic variable travel motor assembly, hydraulic drive travel control system and its application |
| CN113653695A (en) * | 2021-08-30 | 2021-11-16 | 杭州力龙液压有限公司 | Balance valve structure and engineering machinery |
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|---|---|
| CN104929999B (en) | 2017-02-01 |
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Effective date of registration: 20230105 Address after: No. 128, Linyu North Road, Jiaochuan Street, Zhenhai District, Ningbo, Zhejiang 315000 Patentee after: Zhejiang Hongsheng Precision Machinery Co.,Ltd. Address before: No. 21, Chuang e Huigu, No. 777, Zhongguan West Road, Zhuangshi Street, Zhenhai District, Ningbo City, Zhejiang Province 315200 Patentee before: NINGBO JINGKEN HYDRAULIC PRESSURE CO.,LTD. |