CN212717444U - Hydraulic control system and work vehicle - Google Patents
Hydraulic control system and work vehicle Download PDFInfo
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- CN212717444U CN212717444U CN202021518399.XU CN202021518399U CN212717444U CN 212717444 U CN212717444 U CN 212717444U CN 202021518399 U CN202021518399 U CN 202021518399U CN 212717444 U CN212717444 U CN 212717444U
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Abstract
The utility model provides a hydraulic control system and working vehicle. Wherein, hydraulic control system includes: the oil cylinder comprises a rod cavity and a rodless cavity; the reversing valve group is communicated with a rod cavity and a rodless cavity; the liquid supply device is communicated with the reversing valve group; and the speed regulating valve is connected with a pipeline between the liquid supply device and the reversing valve group. The utility model provides a hydraulic control system sets up the governing valve through the pipeline between liquid supply device and switching-over valves, utilizes the governing valve to adjust the flow of the hydraulic medium of hydro-cylinder of flowing through the switching-over valves, is favorable to keeping the flow of the hydraulic medium of hydro-cylinder of flowing through in certain extent or certain threshold value for hydraulic medium is through the hydro-cylinder with the flow of relative invariant, and then makes the stretching out speed of hydro-cylinder and the change that the speed of contracting can not follow the load that contracts of returning change.
Description
Technical Field
The utility model relates to an engineering machine tool technical field particularly, relates to a hydraulic control system and an operating vehicle.
Background
The working platform is used as an aerial working platform of the engineering machinery, and guarantees are provided for the operation safety of workers, and the working platform can be a manned and rescue platform of a climbing platform fire truck and an aerial working truck. At present, the left-right swing of the operation platform is controlled by two control modes, one mode is to control the left-right swing of the operation platform by adopting an electromagnetic proportional valve, and the other mode is to control the left-right swing of the operation platform by adopting a mode of matching a switch valve with a damping.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to at least one of solving or improving the problems of the prior art or related art.
To this end, according to a first aspect of the present invention, a hydraulic control system is provided.
According to a second aspect of the present invention, a work vehicle is provided.
In view of this, according to the first aspect of the present invention, there is provided a hydraulic control system, including: the oil cylinder comprises a rod cavity and a rodless cavity; the reversing valve group is communicated with a rod cavity and a rodless cavity; the liquid supply device is communicated with the reversing valve group; and the speed regulating valve is connected with a pipeline between the liquid supply device and the reversing valve group.
The utility model provides a hydraulic control system, including hydro-cylinder, switching-over valves, supply liquid device and governing valve, wherein, the hydro-cylinder is including pole chamber and rodless chamber, and switching-over valves intercommunication has pole chamber and rodless chamber to be linked together with supplying the liquid device, and then provide the hydro-cylinder with the orientation of difference through supplying the liquid device with hydraulic medium through the switching-over valves, in order to realize the flexible operation of hydro-cylinder, and then drive the operation platform horizontal hunting. The speed regulating valve is arranged on the pipeline between the liquid supply device and the reversing valve group, the flow of the hydraulic medium flowing through the oil cylinder through the reversing valve group is regulated through the speed regulating valve, the flow of the hydraulic medium flowing through the oil cylinder is favorably kept in a certain range or a certain threshold value, the hydraulic medium flows through the oil cylinder at a relatively constant flow, the extending speed and the retracting speed of the oil cylinder are further enabled not to change along with the change of the load, the stability of the movement of an operation platform connected with the oil cylinder is improved, the operation efficiency and the operation safety are further favorably improved, and the device is suitable for popularization and application.
Additionally, the utility model provides an among the above-mentioned technical scheme hydraulic control system can also have following additional technical characteristics:
in the above technical solution, further, the method further includes: the liquid supply device is communicated with the first liquid storage device; the switching-over valves includes: the first switch valve is provided with a first liquid inlet, a first working port and a first liquid outlet, the first liquid inlet is communicated with the speed regulating valve, the first working port is communicated with the rod cavity, and the first liquid outlet is communicated with the first liquid storage device; and the second switch valve is provided with a second liquid inlet, a second working port and a second liquid outlet, the second liquid inlet is connected to a pipeline between the speed regulating valve and the first liquid inlet, the second working port is communicated with the rodless cavity, and the second liquid outlet is communicated with the first liquid storage device.
In the technical scheme, the hydraulic system further comprises a first liquid storage device, the first liquid storage device is used for storing hydraulic media, the liquid supply device is communicated with the first liquid storage device, namely the liquid supply device is connected with the first liquid storage device and the speed regulating valve, and then the hydraulic media in the first liquid storage device flows into the reversing valve group at a constant flow rate after being regulated by the speed regulating valve.
The reversing valve group comprises a first switch valve and a second switch valve, a first liquid inlet of the first switch valve is communicated with the speed regulating valve, a first working port of the first switch valve is communicated with the rod cavity, a first liquid outlet of the first switch valve is communicated with the first liquid storage device, a second liquid inlet of the second switch valve is communicated with a pipeline between the speed regulating valve and the first liquid inlet, a second working port of the second switch valve is communicated with the rodless cavity, and a second liquid outlet of the second switch valve is communicated with the first liquid storage device.
When the first switch valve is electrified and the second switch valve is not electrified, the hydraulic medium in the first liquid storage device enters the rod cavity through the speed regulating valve, the first liquid inlet and the first working port of the first switch valve under the action of the liquid supply device, and the hydraulic medium in the rodless cavity flows back to the first liquid storage device through the second working port and the second liquid outlet of the second switch valve, so that the circulation of the hydraulic medium is realized, and the contraction action of the oil cylinder is realized.
When the first switch valve is electrified and the second switch valve is electrified, the hydraulic medium in the first liquid storage device enters the rod cavity through the speed regulating valve, the first liquid inlet of the first switch valve and the first working port under the action of the liquid supply device, and the hydraulic medium in the first liquid storage device enters the rodless cavity through the speed regulating valve, the second liquid inlet of the second switch valve and the second working port under the action of the liquid supply device.
In any of the above technical solutions, further, the first switch valve is a two-position three-way electromagnetic valve; and/or the second switch valve is a two-position three-way electromagnetic valve.
In the technical scheme, the two-position three-way electromagnetic valve is low in cost and high in universality, the first switch valve is the two-position three-way electromagnetic valve, and/or the second switch valve is the two-position three-way electromagnetic valve, so that differential control can be realized by utilizing the two universal two-position three-way electromagnetic valves, the differential control is realized without a specially manufactured differential valve, the manufacturing cost is greatly reduced, the realization is easy, and the two-position three-way electromagnetic valve is suitable for popularization and application.
In any of the above technical solutions, further, the method further includes: the hydraulic lock is connected with a pipeline between the oil cylinder and the reversing valve group; the hydraulic lock includes: the first one-way valve is provided with a third working port and a fourth working port, the third working port is communicated with the rod cavity, and the fourth working port is communicated with the first working port of the first switch valve; the second one-way valve is provided with a fifth working port and a sixth working port, the fifth working port is communicated with the rodless cavity, and the sixth working port is communicated with the second working port of the second switch valve; and the third working port of the first one-way valve is communicated with the sixth working port of the second one-way valve, and the fourth working port of the second one-way valve is communicated with the fifth working port of the second one-way valve.
In the technical scheme, the hydraulic system further comprises a hydraulic lock, the hydraulic lock is connected to a pipeline between the oil cylinder and the reversing valve group, so that after the reversing valve group is used for enabling the oil cylinder to extend out or retract to the designated position, the liquid supply device stops working, the hydraulic lock can be used for enabling a hydraulic medium in the hydraulic system to be maintained in a balanced state, the oil cylinder can be stably and reliably stopped at the current position, the operation platform can be stably and reliably kept at the current swing position, and the safety and the reliability of operation are improved.
Furthermore, the hydraulic lock comprises a first one-way valve and a second one-way valve, a third working port of the first one-way valve is communicated with the rod cavity, a fourth working port of the first one-way valve is communicated with the first working port of the first switch valve, a fifth working port of the second one-way valve is communicated with the rodless cavity, a sixth working port of the second one-way valve is communicated with the second working port of the second switch valve, and is communicated with a sixth working port of the second one-way valve through a third working port of the first one-way valve, a fourth working port of the second one-way valve is communicated with a fifth working port of the second one-way valve, the first one-way valve and the second one-way valve are matched to realize the function of bidirectional locking, so that after the oil cylinder extends out or retracts to a designated position, the condition of backflow of hydraulic medium in the hydraulic system can not occur, and the oil cylinder can stably and reliably stay at the current position.
In any one of the above technical solutions, further, the hydraulic lock further includes: and the second liquid storage device is communicated with the first one-way valve or the second one-way valve through a pipeline.
In this technical scheme, the hydraulic pressure lock still includes second stock solution device, on the one hand, second stock solution device passes through the pipeline intercommunication with first check valve, on the other hand, second stock solution device passes through the pipeline intercommunication with the second check valve, the different setting positions of second stock solution device, can satisfy the demand of the different pipeline intercommunications of hydraulic system, the application range of product has been enlarged, the setting of second stock solution device can make first check valve and second check valve reverse opening smoothly, be favorable to improving the reliability of hydraulic pressure lock.
In any of the above technical solutions, further, the method further includes: and the overflow valve is connected to a pipeline between the speed regulating valve and the first liquid storage device.
In the technical scheme, the hydraulic system further comprises an overflow valve, the overflow valve is connected to a pipeline between the speed regulating valve and the first liquid storage device, the overflow valve is arranged and can limit the pressure of the hydraulic system, the excess flow of the hydraulic medium is returned to the first liquid storage device from the overflow valve on the basis that the hydraulic medium flows through the speed regulating valve at constant flow, the flow of the hydraulic medium flowing through the speed regulating valve is further guaranteed to be constant, the extending speed and the retracting speed of the oil cylinder are enabled not to change along with the change of the load, meanwhile, the extending speed and the retracting speed of the oil cylinder are enabled not to change along with the change of the temperature, and the left-right swinging speed of the operation platform is.
In any of the above technical solutions, further, the liquid supply device includes a first working end and a second working end, the first working end is communicated with the reversing valve set, and the second working end is communicated with the first liquid storage device; the first liquid storage device comprises a liquid supply port and a liquid return port, and the liquid supply device is communicated with the liquid supply port; the overflow valve comprises a third liquid inlet and a third liquid outlet, the third liquid inlet is connected to a pipeline between the speed regulating valve and the liquid supply port, and the third liquid outlet is communicated with the liquid return port.
In the technical scheme, the first working end of the liquid supply device is communicated with the reversing valve group by reasonably arranging a matching structure of the liquid supply device and the reversing valve group, so that the reversing valve group is communicated with a rod cavity and a rodless cavity and is communicated with the first working end of the liquid supply device, and then the liquid supply device supplies the hydraulic medium to the swing oil cylinder in different directions through the reversing valve group, so that the telescopic operation of the swing oil cylinder is realized, and the operation platform is driven to swing left and right.
Furthermore, a second working end of the liquid supply device is communicated with the first liquid storage device, namely the liquid supply device is connected with the first liquid storage device and the speed regulating valve, so that the hydraulic medium in the first liquid storage device flows into the reversing valve group at a constant flow rate after being regulated by the speed regulating valve.
Furthermore, the liquid supply device is communicated with a liquid supply port of the first liquid storage device, a third liquid inlet of the overflow valve is communicated with a pipeline between the speed regulating valve and the liquid supply port, and a third liquid outlet of the overflow valve is communicated with a liquid return port of the first liquid storage device, so that after the liquid supply device pumps out the hydraulic medium in the first liquid storage device, the hydraulic medium with a certain flow rate flows into the reversing valve group through the speed regulating valve, the extending speed and the retracting speed of the oil cylinder are not changed along with the change of the load, and the hydraulic medium with a surplus flow rate returns to the first liquid storage device through the overflow valve, and the energy conservation is facilitated.
In any of the above technical solutions, further, the effective active area of the rod chamber of the cylinder is 2 times larger than that of the rodless chamber.
In the technical scheme, the effective action area of the rod cavity of the oil cylinder is 2 times that of the rodless cavity, namely, the effective action area of the rod cavity is larger than that of the rodless cavity, so that the swing oil cylinder extends outwards, namely, the hydraulic medium in the rod cavity enters the rodless cavity through the first working port of the first switch valve, the first liquid inlet, the second liquid inlet of the second switch valve and the second working port, namely, the hydraulic medium in the rodless cavity at the moment comprises the hydraulic medium which flows back to the rodless cavity through the rod cavity through the first switch valve and the second switch valve, and the hydraulic medium which flows into the rodless cavity through the speed regulating valve and the second switch valve by the first liquid storage device.
Furthermore, the effective action area of the rod cavity is 2 times that of the rodless cavity, namely the effective action volume of the hydraulic medium in the rodless cavity is 2 times that of the hydraulic medium in the rod cavity, so that the extending speed and the retracting speed of the swing oil cylinder are approximately equal, the left-right swing speed of the operation platform is approximately the same, the swing stability and reliability of the operation platform are improved, and the operation efficiency and the operation safety are improved.
In any of the above technical solutions, further, the liquid supply device is a hydraulic pump.
In the technical scheme, the liquid supply device is a hydraulic pump, a first working end of the hydraulic pump is communicated with the speed regulating valve, and a second working end of the hydraulic pump is communicated with the first liquid storage device, so that a hydraulic medium in the first liquid storage device is pumped into the reversing valve group through the speed regulating valve by the hydraulic pump, and a power source is provided for extension or retraction of the oil cylinder.
According to a second aspect of the present invention, there is provided an operating vehicle, comprising: an operation platform; and in the hydraulic control system of any technical scheme of the first aspect, the oil cylinder is a swing oil cylinder and is connected to the operation platform, and the hydraulic control system is used for driving the operation platform to swing.
The utility model provides an operation vehicle, including the hydraulic control system of any technical scheme of operation platform and the above-mentioned first aspect, hydraulic system is used for driving the swing of operation platform, because operation vehicle includes the hydraulic control system of any technical scheme of the aforesaid, consequently has this hydraulic control system's whole beneficial effect, no longer gives unnecessary details here.
Specifically, the oil cylinder is a swing oil cylinder and is connected to the operation platform.
The utility model provides a hydraulic control system, replace the proportional valve with switch solenoid valve, realize differential control with two general two three-way valves, low cost, easily realize, and can guarantee through increasing the governing valve at the oil inlet way that swing hydro-cylinder speed does not receive the load influence, be favorable to improving work platform wobbling stationarity and reliability, and simultaneously, differential circuit has guaranteed that the asymmetric swing hydro-cylinder of two effects stretches out and return the velocity substantially the same with contracting, work platform wobbling stability and reliability have further been improved, be favorable to improving the security of operating efficiency and operation.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram illustrating a hydraulic control system according to a first embodiment of the related art;
fig. 2 is a schematic structural diagram showing a hydraulic control system provided in a second embodiment of the related art;
fig. 3 shows a schematic structural diagram of a hydraulic control system according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a hydraulic control system according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a hydraulic control system according to a third embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a reversing valve group provided according to an embodiment of the present invention;
fig. 7 shows a schematic structural diagram of a speed regulating valve provided according to an embodiment of the present invention;
fig. 8 shows a schematic structural diagram of a hydraulic lock provided according to an embodiment of the present invention;
fig. 9 shows a schematic structural diagram of an overflow valve provided according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
100 ' hydraulic system, 110 ' cylinder, 112 ' rod chamber, 114 ' rodless chamber, 121 ' first electromagnetic proportional valve, 122 ' first on-off valve, 123 ' second electromagnetic proportional valve, 124 ' second on-off valve, 125 ' damping.
Wherein, the correspondence between the reference numbers and the part names in fig. 3 to 9 is:
100, 110, 112, having a rod cavity, 114, no rod cavity, 120, a reversing valve set, 122, a first on-off valve, 1222, a first fluid inlet, 1224, a first working port, 1226, a first fluid outlet, 124, a second on-off valve, 1242, a second fluid inlet, 1244, a second fluid outlet, 1246, a fluid supply device 130, 132, a first working port, 134, a second working port, 140, 150, a first fluid reservoir, 160, a hydraulic lock, 162, 1622, a third working port, 1624, a fourth working port, 164, a second one-way valve, 1642, a fifth working port, 1644, a sixth working port, 166, a second fluid reservoir, 170, a relief valve 172, a third fluid inlet, and 174 a third fluid outlet.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A hydraulic control system 100 and a work vehicle provided according to some embodiments of the present invention are described below with reference to fig. 3 to 9.
Example 1:
as shown in fig. 3 to 5, according to a first aspect of the present invention, a hydraulic control system 100 is provided, which includes a cylinder 110, a valve group 120, a liquid supply device 130 and a speed control valve 140.
Specifically, as shown in fig. 3, 4, 5 and 7, the cylinder 110 includes a rod cavity 112 and a rod-less cavity 114, the reversing valve set 120 is communicated with the rod cavity 112 and the rod-less cavity 114 and is communicated with the liquid supply device 130, so that the liquid supply device 130 supplies the hydraulic medium to the cylinder 110 through the reversing valve set 120 in different directions, thereby realizing the telescopic operation of the cylinder 110 and further driving the work platform to swing left and right. The speed regulating valve 140 is arranged on a pipeline between the liquid supply device 130 and the reversing valve group 120, and the flow rate of the hydraulic medium flowing through the oil cylinder 110 through the reversing valve group 120 is regulated through the speed regulating valve 140, so that the flow rate of the hydraulic medium flowing through the oil cylinder 110 is favorably kept within a certain range or within a certain threshold value, the hydraulic medium flows through the oil cylinder 110 at a relatively constant flow rate, the extending speed and the retracting speed of the oil cylinder 110 are further enabled not to change along with the change of a load, the moving stability of an operation platform connected with the oil cylinder 110 is improved, the operation efficiency and the operation safety are further favorably improved, and the device is suitable for popularization and application.
Specifically, in the hydraulic system 100 ' adopting the electromagnetic proportional valve in the related art, as shown in fig. 1, the first electromagnetic proportional valve 121 ' is powered, the second electromagnetic proportional valve 123 ' is not powered, the rod chamber 112 ' of the oil cylinder 110 ' feeds oil into the rodless chamber 114 ', and the oil cylinder 110 ' retracts. The second electromagnetic proportional valve 123 'is electrified, the first electromagnetic proportional valve 121' is not electrified, the oil in the rodless cavity 114 'of the oil cylinder 110' returns oil in the rod cavity 112 ', and the oil cylinder 110' extends outwards. In order to ensure that the extending or retracting speed of the oil cylinder 110 ' is the same, namely the left-right swinging speed of the working platform is the same, the current on the side of the first electromagnetic proportional valve 121 ' is smaller than the current on the side of the second electromagnetic proportional valve 123 '. However, the above-described hydraulic system 100' still has the following disadvantages:
(1) the swing speed of the working platform changes along with the change of the load, the load is increased, the swing speed is slowed down, the load is reduced, and the swing speed is increased. Due to the flow through the electromagnetic proportional valve
In the formula, a1 represents the opening size of the electromagnetic proportional valve, C is the flow coefficient, and Δ P is the pressure difference between the inlet end and the outlet end of the electromagnetic proportional valve. When the control current is constant, that is, when a1 is fixed, if the work platform load increases, the pressure difference Δ P across the electromagnetic proportional valve decreases, that is, the flow rate Q supplied to the cylinder 110 'by the electromagnetic proportional valve decreases, and the work platform swing speed becomes slow, whereas if the work platform load decreases, the pressure difference Δ P across the electromagnetic proportional valve increases, the flow rate Q supplied to the cylinder 110' by the electromagnetic proportional valve increases, and the work platform swing speed becomes fast.
(2) The swing speed of the operation platform changes along with the temperature change, the swing speed is high at high temperature, and the swing speed is low at low temperature. Specifically, at a low temperature, the viscosity of the oil increases, so that the flow rate of the hydraulic oil entering the electromagnetic proportional valve decreases, and further, the retraction speed or the extension speed of the oil cylinder 110' decreases, that is, the swing speed of the work platform decreases. At high temperature, the viscosity of the oil is reduced, so that the flow rate of the hydraulic oil entering the electromagnetic proportional valve is increased, and further the retraction speed or the extension speed of the oil cylinder 110' is changed, namely the swing speed of the operation platform is increased.
Similarly, in the related art hydraulic system 100 'employing the on-off valve and the damping 125' in cooperation, as shown in fig. 2, the first on-off valve 122 'is powered, the second on-off valve 124' is not powered, the rod chamber 112 'of the cylinder 110' is fed with oil and the rodless chamber 114 'is fed with oil, and the cylinder 110' is retracted. The second switch valve 124 'is powered, the first switch valve 122' is not powered, the rod-less chamber 114 'of the oil cylinder 110' is filled with oil, the rod chamber 112 'is filled with oil, and the oil cylinder 110' is extended outwards. In order to control the swing speed of the oil cylinder 110 ', the damping 125 ' is added to the oil port of the oil cylinder 110 '. However, the above-described hydraulic system 100' still has the following disadvantages:
(1) the swing speed of the working platform changes along with the change of the load, the load is increased, the swing speed is slowed down, the load is reduced, and the swing speed is increased. Due to the flow through the orifice of the damping 125
Where A2 represents the orifice size of the damper 125 ', C is the flow coefficient, and Δ P is the pressure difference between the inlet and outlet ends of the damper 125'. Since a2 is fixed, when the work platform load increases, the pressure difference Δ P across the damper 125 'decreases, the flow Q supplied to the cylinder 110' through the damper hole decreases, the work platform swing speed becomes slower, whereas when the work platform load decreases, the pressure difference Δ P across the damper 125 'increases, the flow Q supplied to the cylinder 110' through the damper hole increases, and the work platform swing speed becomes faster.
(2) The swing speed of the operation platform changes along with the temperature change, the swing speed is high at high temperature, and the swing speed is low at low temperature. Specifically, at a low temperature, the viscosity of the oil increases, so that the flow rate of the hydraulic oil flowing through the damper 125 'decreases, and further, the retraction speed or the extension speed of the cylinder 110' decreases, that is, the swing speed of the work platform decreases. At high temperature, the viscosity of the oil is reduced, so that the flow rate of the hydraulic oil flowing through the damping holes is increased, and further, the retraction speed or the extension speed of the oil cylinder 110' is changed, namely, the swing speed of the working platform is increased.
According to the utility model provides an embodiment, set up governing valve 140 between switching-over valves 120 and liquid supply device 130, the inlet circuit at switching-over valves 120 increases governing valve 140 promptly, governing valve 140 can make the flow of the hydraulic medium who gets into hydro-cylinder 110 invariable, and then make the stretching out speed of hydro-cylinder 110 or return the change that the speed does not follow the load and change, and simultaneously, the influence of temperature to the hydraulic medium viscosity has been avoided, make the stretching out speed of hydro-cylinder 110 or return the change that the speed does not follow the temperature and change, further improve operation platform wobbling stationarity and reliability.
It can be understood that under the low temperature working condition or the high temperature working condition, the flow rate of the hydraulic medium flowing into the reversing valve group 120 can be adjusted through the speed regulating valve 140, so that the flow rate of the hydraulic medium flowing into the reversing valve group 120 is adapted to the temperature of the working condition, and further under the low temperature working condition or the high temperature working condition, the extending speed and the retracting speed of the oil cylinder 110 are the same as those under the normal temperature working condition, and the swinging stability and the reliability of the working platform are further improved.
Example 2:
as shown in fig. 3 to fig. 6, according to an embodiment of the present invention, on the basis of the above embodiment 1, further, the present invention further includes: the first liquid storage device 150, the liquid supply device 130 is communicated with the first liquid storage device 150; the switching-over valves includes: a first on-off valve 122, the first on-off valve 122 having a first inlet 1222, a first working port 1224, and a first outlet 1226, the first inlet 1222 being in communication with the speed valve 140, the first working port 1224 being in communication with the rod chamber 112, the first outlet 1226 being in communication with the first reservoir 150; and the second switch valve 124, the second switch valve 124 has a second liquid inlet 1242, a second working port 1244 and a second liquid outlet 1246, the second liquid inlet 1242 is connected to the pipeline between the speed regulating valve 140 and the first liquid inlet 1222, the second working port 1244 is communicated with the rodless cavity 114, and the second liquid outlet 1246 is communicated with the first liquid storage device 150.
In this embodiment, as shown in fig. 5, the hydraulic system 100 further includes a first liquid storage device 150, the first liquid storage device 150 is used for storing the hydraulic medium, and the liquid supply device 130 is communicated with the first liquid storage device 150, that is, the liquid supply device 130 is connected to the first liquid storage device 150 and the speed regulating valve 140, so that the hydraulic medium in the first liquid storage device 150 flows into the direction changing valve set 120 at a constant flow rate after being regulated by the speed regulating valve 140.
As shown in fig. 7, the direction valve set 120 includes a first on-off valve 122 and a second on-off valve 124, a first inlet 1222 of the first on-off valve 122 is communicated with the speed valve 140, a first working port 1224 of the first on-off valve 122 is communicated with the rod chamber 112, a first outlet 1226 of the first on-off valve 122 is communicated with the first reservoir 150, a second inlet 1242 of the second on-off valve 124 is communicated with the pipeline between the speed valve 140 and the first inlet 1222, a second working port 1244 of the second on-off valve 124 is communicated with the rodless chamber 114, and a second outlet 1246 of the second on-off valve 124 is communicated with the first reservoir 150.
When the first on-off valve 122 is powered on and the second on-off valve 124 is not powered on, the hydraulic medium in the first reservoir 150 enters the rod chamber 112 through the speed control valve 140, the first inlet port 1222 and the first working port 1224 of the first on-off valve 122 under the action of the liquid supply device 130, and the hydraulic medium in the rodless chamber 114 flows back to the first reservoir 150 through the second working port 1244 and the second outlet port 1246 of the second on-off valve 124, so that the circulation of the hydraulic medium is realized, and the contraction action of the oil cylinder 110 is realized.
When the first switch valve 122 is energized and the second switch valve 124 is energized, the hydraulic medium in the first reservoir 150 enters the rod chamber 112 through the speed regulating valve 140, the first inlet 1222 and the first working port 1224 of the first switch valve 122 under the action of the liquid supply device 130, and the hydraulic medium in the first reservoir 150 enters the rodless chamber 114 through the speed regulating valve 140, the second inlet 1242 and the second working port 1244 of the second switch valve 124 under the action of the liquid supply device 130.
Further, the liquid supply device 130 includes a first working end 132 and a second working end 134, the first working end 132 is communicated with the direction valve set 120, and the second working end 134 is communicated with the first liquid storage device 150.
That is, by reasonably arranging the matching structure of the liquid supply device 130 and the reversing valve set 120, the first working end 132 of the liquid supply device 130 is communicated with the reversing valve set 120, and then the liquid supply device 130 supplies the hydraulic medium to the oil cylinder 110 through the reversing valve set 120 in different directions, so as to realize the telescopic operation of the oil cylinder 110 and further drive the operation platform to swing left and right.
In addition, since the second working end 134 of the liquid supply device 130 is communicated with the first liquid storage device 150, that is, the liquid supply device 130 is connected to the first liquid storage device 150 and the speed regulating valve 140, the hydraulic medium in the first liquid storage device 150 flows into the reversing valve set 120 at a constant flow rate after being regulated by the speed regulating valve 140.
Further, the effective active area of the rod chamber 112 is 2 times the effective active area of the rod-less chamber 114. Since the effective acting area of the rod chamber 112 is larger than that of the rodless chamber 114, the cylinder 110 is extended, that is, the hydraulic medium in the rod chamber 112 enters the rodless chamber 114 through the first working port 1224 of the first on-off valve 122, the first inlet port 1222, the second inlet port 1242 of the second on-off valve 124 and the second working port 1244, that is, the hydraulic medium in the rodless chamber 114 includes the hydraulic medium flowing back from the rod chamber 112 to the rodless chamber 114 through the first on-off valve 122 and the second on-off valve 124, and the hydraulic medium flowing from the first reservoir device 150 to the rodless chamber 114 through the speed control valve 140 and the second on-off valve 124.
The effective action area of the rod cavity 112 is 2 times that of the rodless cavity 114, namely the effective action volume of the hydraulic medium in the rodless cavity 114 is 2 times that of the hydraulic medium in the rod cavity 112, so that the extending speed and the retracting speed of the oil cylinder 110 are approximately equal, the left-right swinging speed of the working platform is approximately the same, the swinging stability and the reliability of the working platform are improved, and the improvement of the working efficiency and the working safety are further facilitated.
Specifically, the first liquid storage device 150 is an oil tank, and may have another structure that meets the requirement.
Specifically, because the two-position three-way solenoid valve is low in cost and high in universality, the two-position three-way solenoid valve is adopted as the first switch valve 122, and/or the second switch valve 124 is adopted as the two-position three-way solenoid valve, so that differential control can be realized by utilizing two universal two-position three-way solenoid valves, differential control is realized without a specially manufactured differential valve, the manufacturing cost is greatly reduced, and the two-position three-way solenoid valve is easy to realize and is suitable for popularization and application.
It is understood that the first and second on-off valves 122 and 124 may be other configurations as desired.
Specifically, the liquid supply device 130 is a hydraulic pump, a first working end 132 of the hydraulic pump is communicated with the speed regulating valve 140, and a second working end 134 of the hydraulic pump is communicated with the first liquid storage device 150, so that the hydraulic medium in the first liquid storage device 150 is pumped into the reversing valve set 120 through the speed regulating valve 140 by the hydraulic pump, and a power source is provided for extending or retracting the oil cylinder 110. It is understood that the liquid supply device 130 may be other liquid supply devices 130 that meet the requirements.
Example 3:
as shown in fig. 3 to 5, according to an embodiment of the present invention, on the basis of the above embodiment 2, further, the present invention further includes: and a hydraulic lock 160 connected to a pipe between the cylinder 110 and the direction valve block 120.
In this embodiment, as shown in fig. 3, 4, and 5, the hydraulic system 100 further includes a hydraulic lock 160, which connects the hydraulic lock 160 to a pipeline between the cylinder 110 and the reversing valve set 120, so that after the cylinder 110 is extended or retracted to a designated position by the reversing valve set 120 and the liquid supply device 130 stops working, the hydraulic lock 160 can maintain the hydraulic medium in the hydraulic system 100 in a balanced state, and further the cylinder 110 can stably and reliably stay at the current position, so that the work platform can stably and reliably remain at the current swing position, and the safety and reliability of the work can be improved.
Further, as shown in fig. 8, the hydraulic lock 160 includes a first check valve 162, a second check valve 164, a third working port 1622 of the first check valve 162 communicates with the rod chamber 112, a fourth working port 1624 of the first check valve 162 communicates with the first working port 1224 of the first on-off valve 122, a fifth working port 1642 of the second check valve 164 communicates with the rod chamber 114, a sixth working port 1644 of the second check valve 164 communicates with the second working port 1244 of the second on-off valve 124, and communicates with the third working port 1622 of the first check valve 162 and the sixth working port 1644 of the second check valve 164, and the fourth working port 1624 of the second check valve 164 communicates with the fifth working port 1642 of the second check valve 164, so that a function of bidirectional locking is implemented by cooperation of the first check valve 162 and the second check valve 164, so that a hydraulic medium in the hydraulic system 100 is not returned after the cylinder 110 is extended or retracted to a designated position, the cylinder 110 can stably and reliably stay at the current position.
The hydraulic lock 160 further comprises a second liquid storage device 166, on one hand, the second liquid storage device 166 is communicated with the first one-way valve 162 through a pipeline, on the other hand, the second liquid storage device 166 is communicated with the second one-way valve 164 through a pipeline, different setting positions of the second liquid storage device 166 can meet requirements for communication of different pipelines of the hydraulic system 100, the application range of products is enlarged, the first one-way valve 162 and the second one-way valve 164 can be smoothly opened reversely through setting of the second liquid storage device 166, and improvement of reliability of the hydraulic lock 160 is facilitated.
Specifically, the second reservoir 166 is a tank, and other configurations may be sufficient, it being understood that the arrangement of the second reservoir 166 provides a pressure relief circuit for the hydraulic lock 160 circuit formed by the first check valve 162 and the second check valve 164.
Example 4:
as shown in fig. 4 and 5, according to an embodiment of the present invention, on the basis of any one of the above embodiments 1 to 3, further, the present invention further includes: and the overflow valve 170, wherein the overflow valve 170 is connected to a pipeline between the speed regulating valve 140 and the first liquid storage device 150.
In this embodiment, as shown in fig. 4, 5, and 9, the hydraulic system 100 further includes an overflow valve 170, the overflow valve 170 is connected to a pipeline between the speed control valve 140 and the first liquid storage device 150, and the overflow valve 170 is configured to limit the pressure of the hydraulic system 100, so that on the basis of ensuring that the hydraulic medium flows through the speed control valve 140 at a constant flow rate, the excess flow rate of the hydraulic medium is returned from the overflow valve 170 to the first liquid storage device 150, and further ensuring that the flow rate of the hydraulic medium flowing through the speed control valve 140 is constant, so that the extension speed and the retraction speed of the cylinder 110 do not change with changes in load, and at the same time, do not change with changes in temperature, and the left-right swing speed of the working platform is stable.
Further, the first liquid storage device 150 includes a liquid supply port and a liquid return port, and the liquid supply device 130 is communicated with the liquid supply port; the overflow valve 170 includes a third liquid inlet 172 and a third liquid outlet 174, the third liquid inlet 172 is connected to a pipeline between the speed control valve 140 and the liquid supply port, and the third liquid outlet 174 is communicated with the liquid return port.
Specifically, as shown in fig. 5 and 9, the liquid supply device 130 is communicated with a liquid supply port of the first liquid storage device 150, the third liquid inlet 172 of the overflow valve 170 is communicated with a pipeline between the speed regulating valve 140 and the liquid supply port, and the third liquid outlet 174 of the overflow valve 170 is communicated with a liquid return port of the first liquid storage device 150, so that after the liquid supply device 130 pumps out the hydraulic medium in the first liquid storage device 150, a certain flow of the hydraulic medium flows into the direction changing valve set 120 through the speed regulating valve 140 so that the extension speed and the retraction speed of the oil cylinder 110 do not change with the change of the load, and an excess flow of the hydraulic medium returns to the first liquid storage device 150 through the overflow valve 170, which is beneficial to saving energy.
Example 5:
as shown in fig. 3 to 9, according to the second aspect of the present invention, there is provided a working vehicle, including the hydraulic control system 100 of any one of the above-mentioned first aspect and the working platform, the oil cylinder 110 is a swing oil cylinder, and is connected to the working platform, the hydraulic control system 100 is used for driving the working platform to swing, and since the working vehicle includes the hydraulic control system 100 of any one of the above-mentioned technical schemes, the hydraulic control system 100 has all the advantages, and is not described herein again.
Furthermore, the working vehicle is a climbing platform fire truck and an aerial working vehicle.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As shown in fig. 3 to 9, the working vehicle is an elevating platform fire truck or an aerial work vehicle. As shown in fig. 3 to 5, the working vehicle includes a working platform and a hydraulic system 100, the hydraulic system 100 is used for driving the working platform to swing, the hydraulic system 100 includes an oil cylinder 110, a reversing valve set, a liquid supply device 130, a speed regulating valve 140, a hydraulic lock 160, an overflow valve 170 and a first liquid storage device 150, wherein the oil cylinder 110 is connected to the working platform, a second working end 134 of the liquid supply device 130 is communicated with the first liquid storage device 150, a first working end 132 of the liquid supply device 130 is communicated with the reversing valve set, and the speed regulating valve 140 is connected to a pipeline between the first working end 132 of the liquid supply device 130 and the reversing valve set. The excess flow valve 170 is connected in line between the speed valve 140 and the first reservoir 150.
As shown in fig. 6, the direction valve set includes a first on-off valve 122 and a second on-off valve 124, a first inlet 1222 of the first on-off valve 122 is communicated with the speed control valve 140, a first working port 1224 of the first on-off valve 122 is communicated with the rod chamber 112, a first outlet 1226 of the first on-off valve 122 is communicated with the first reservoir 150, a second inlet 1242 of the second on-off valve 124 is communicated with the pipeline between the speed control valve 140 and the first inlet 1222, a second working port 1244 of the second on-off valve 124 is communicated with the rodless chamber 114, and a second outlet 1246 of the second on-off valve 124 is communicated with the first reservoir 150.
As shown in fig. 8, the hydraulic lock 160 is connected to the line between the cylinder 110 and the reversing valve block 120.
The first working end 132 (shown as port P in fig. 5) of the liquid supply device 130 is a port for supplying a hydraulic medium, such as pressure oil, to the direction valve set 120, and is a power source for the swing of the cylinder 110.
As shown in fig. 5 and 9, the relief valve 170 may be configured to limit the pressure in the hydraulic system 100 and allow excess hydraulic medium to flow from the relief valve 170 back to the first reservoir 150 (e.g., the tank).
As shown in fig. 3, 4, 5 and 7, the governor valve 140 can ensure that the hydraulic medium flows through the governor valve 140 at a constant flow rate so that the extension speed and the retraction speed of the cylinder 110 are not changed according to the external load.
The first switching valve 122 (e.g., a solenoid valve) and the second switching valve 124 (e.g., a solenoid valve), which are hydraulic medium direction control valves, control the flow direction of the hydraulic medium.
Oil cylinder 110: and the actuating element extends or retracts under the action of the pressure oil to push the working platform to swing left and right.
The utility model provides a hydraulic system 100's working process does: the hydraulic medium flows in from the first working end 132 (shown as port P in fig. 5) of the liquid supply device 130, and through the regulating action of the speed regulating valve 140, a fixed flow of the hydraulic medium is ensured to pass through, and an excess flow of the hydraulic medium flows back to the first liquid storage device 150 from the overflow valve 170. When the first on-off valve 122 is energized, high-pressure oil flows into the rod chamber 112 through the first battery valve, and the cylinder 110 is retracted. The hydraulic medium in the rodless chamber 114 of the cylinder 110 returns to the tank from the second switching valve 124. When the first switching valve 122 and the second switching valve 124 are both energized, high-pressure oil flows from the second switching valve 124 into the rod-less chamber 114 of the cylinder 110, and the cylinder 110 extends outward because the effective area of the rod-less chamber 114 is larger than the effective area of the rod chamber 112. At this time, the hydraulic medium in the rod chamber 112 of the cylinder 110 flows into the rodless chamber 114 through the first on-off valve 122 and the second on-off valve 124, i.e., the volume of the hydraulic medium entering the rodless chamber 114 is the sum of the volume of the hydraulic medium returning from the rod chamber 112 and the volume of the hydraulic medium supplied through the speed control valve 140. Since the ratio of the effective active volume of the rodless chamber 114 to the effective active volume of the rod chamber 112 is 2: 1, the extending speed of the cylinder 110 is approximately equal to the retracting speed, and the left-right swinging speed of the cylinder 110 is approximately equal. The left-right swinging speed of the oil cylinder 110 is only related to the set flow of the speed regulating valve 140. The speed valve 140 ensures that the flow rate is constant and does not change with load changes.
The utility model provides a hydraulic control system 100, replace the proportional valve with the on-off solenoid valve, realize differential control with two general two three-way valves, it is with low costs, easily realize, and can guarantee that hydro-cylinder 110 speed is not influenced by the load through increasing speed governing valve 140 at the oil inlet way, be favorable to improving work platform wobbling stationarity and reliability, and simultaneously, differential circuit has guaranteed that two effect asymmetric hydro-cylinder 110 stretch out speed and retraction velocity are the same basically, work platform wobbling stability and reliability have further been improved, be favorable to improving the security of operating efficiency and operation.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the drawings, which are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In the present disclosure, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A hydraulic control system, comprising:
the oil cylinder comprises a rod cavity and a rodless cavity;
the reversing valve group is communicated with the rod cavity and the rodless cavity;
the liquid supply device is communicated with the reversing valve group;
and the speed regulating valve is connected with a pipeline between the liquid supply device and the reversing valve group.
2. The hydraulic control system of claim 1, further comprising:
the liquid supply device is communicated with the first liquid storage device;
the reversing valve group comprises:
the first switch valve is provided with a first liquid inlet, a first working port and a first liquid outlet, the first liquid inlet is communicated with the speed regulating valve, the first working port is communicated with the rod cavity, and the first liquid outlet is communicated with the first liquid storage device;
the second switch valve is provided with a second liquid inlet, a second working port and a second liquid outlet, the second liquid inlet is connected with a pipeline between the speed regulating valve and the first liquid inlet, the second working port is communicated with the rodless cavity, and the second liquid outlet is communicated with the first liquid storage device.
3. The hydraulic control system of claim 2,
the first switch valve is a two-position three-way electromagnetic valve; and/or the presence of a gas in the gas,
the second switch valve is a two-position three-way electromagnetic valve.
4. The hydraulic control system of claim 2, further comprising:
the hydraulic lock is connected with a pipeline between the oil cylinder and the reversing valve group;
the hydraulic lock includes:
a first check valve having a third working port and a fourth working port, said third working port being in communication with said rod chamber, said fourth working port being in communication with said first working port of said first switch valve;
a second one-way valve having a fifth working port in communication with the rodless cavity and a sixth working port in communication with the second working port of the second switching valve;
the third working port of the first one-way valve is communicated with the sixth working port of the second one-way valve, and the fourth working port of the second one-way valve is communicated with the fifth working port of the second one-way valve.
5. The hydraulic control system of claim 4, wherein the hydraulic lock further comprises:
and the second liquid storage device is communicated with the first one-way valve or the second one-way valve through a pipeline.
6. The hydraulic control system according to any one of claims 2 to 5, characterized by further comprising:
and the overflow valve is connected to a pipeline between the speed regulating valve and the first liquid storage device.
7. The hydraulic control system of claim 6,
the liquid supply device comprises a first working end and a second working end, the first working end is communicated with the reversing valve group, and the second working end is communicated with the first liquid storage device;
the first liquid storage device comprises a liquid supply port and a liquid return port, and the liquid supply device is communicated with the liquid supply port;
the overflow valve comprises a third liquid inlet and a third liquid outlet, the third liquid inlet is connected to a pipeline between the speed regulating valve and the liquid supply port, and the third liquid outlet is communicated with the liquid return port.
8. The hydraulic control system of claim 7,
the effective acting area of the rod cavity of the oil cylinder is 2 times of that of the rodless cavity.
9. The hydraulic control system according to any one of claims 1 to 5,
the liquid supply device is a hydraulic pump.
10. A work vehicle, characterized by comprising:
an operation platform; and
a hydraulic control system as claimed in any one of claims 1 to 9, wherein the cylinder is a swing cylinder and is connected to the work platform for driving the work platform to swing.
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| CN202021518399.XU CN212717444U (en) | 2020-07-28 | 2020-07-28 | Hydraulic control system and work vehicle |
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| CN202021518399.XU CN212717444U (en) | 2020-07-28 | 2020-07-28 | Hydraulic control system and work vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530903A (en) * | 2021-08-24 | 2021-10-22 | 天津大学 | Hydraulic drive type rapid compression-expansion machine and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530903A (en) * | 2021-08-24 | 2021-10-22 | 天津大学 | Hydraulic drive type rapid compression-expansion machine and control method thereof |
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