阅读说明：本技术 一种公铁两用车、公铁两用车液压控制系统及方法 (Dual-purpose vehicle for road and railway, and hydraulic control system and method for dual-purpose vehicle for road and railway ) 是由 尹辉 方超 凌斌 马驰 张书林 眭维 于 2021-01-11 设计创作，主要内容包括：本发明公开了一种公铁两用车、公铁两用车液压控制系统及方法,涉及液压控制技术领域,解决了液压系统无法保证导向轮与轨道之间压力稳定的问题。该系统包括蓄能组件、油缸、第一换向阀和比例减压阀,比例减压阀包括减压阀与比例溢流阀,减压阀设置有进油口、出油口和控制口,蓄能组件连通进油口,第一换向阀连通出油口,比例溢流阀连通控制口。本发明通过在蓄能组件与第一换向阀之间设置比例减压阀,当减压阀出油口的压力较低时,蓄能组件对减压阀的进油口补充油液,以提高减压阀出油口的压力；当减压阀出油口的压力较高时,比例溢流阀通过减压阀的控制口溢出油液,以降低减压阀出油口的压力,从而使油缸的油液压力始终保持动态的平衡。(The invention discloses a dual-purpose vehicle for road and railway, a hydraulic control system and a hydraulic control method for the dual-purpose vehicle for road and railway, relates to the technical field of hydraulic control, and solves the problem that a hydraulic system cannot ensure stable pressure between a guide wheel and a track. The system comprises an energy storage assembly, an oil cylinder, a first reversing valve and a proportional pressure reducing valve, wherein the proportional pressure reducing valve comprises a pressure reducing valve and a proportional overflow valve, the pressure reducing valve is provided with an oil inlet, an oil outlet and a control port, the energy storage assembly is communicated with the oil inlet, the first reversing valve is communicated with the oil outlet, and the proportional overflow valve is communicated with the control port. According to the invention, the proportional pressure reducing valve is arranged between the energy storage component and the first reversing valve, and when the pressure of the oil outlet of the pressure reducing valve is lower, the energy storage component supplements oil to the oil inlet of the pressure reducing valve so as to improve the pressure of the oil outlet of the pressure reducing valve; when the pressure of the oil outlet of the pressure reducing valve is high, the oil overflows from the proportional overflow valve through the control port of the pressure reducing valve so as to reduce the pressure of the oil outlet of the pressure reducing valve, and therefore the oil pressure of the oil cylinder is kept in dynamic balance all the time.)

1. The utility model provides a combined car hydraulic control system which characterized in that includes:

an energy storage assembly;

the oil cylinder (1), the said oil cylinder (1) has cavity and rodless cavity of the pole;

the first reversing valve (2), the said first reversing valve (2) communicates with cavity and rodless cavity with pole of the said cylinder (1) separately; and the number of the first and second groups,

the oil-saving proportional pressure reducing valve comprises a proportional pressure reducing valve (3), wherein the proportional pressure reducing valve (3) comprises a pressure reducing valve (31) and a proportional overflow valve (32), the pressure reducing valve (31) is provided with an oil inlet, an oil outlet and a control port, an energy storage assembly is communicated with the oil inlet of the pressure reducing valve (31), a first reversing valve (2) is communicated with the oil outlet of the pressure reducing valve (31), and the proportional overflow valve (32) is communicated with the control port of the pressure reducing valve (31).

2. The convertible vehicle hydraulic control system of claim 1, characterized in that the energy storage assembly comprises at least two groups of energy accumulators (4), and each group of energy accumulators (4) is communicated with at least two groups of oil cylinders (1) through the proportional pressure reducing valve (3) and the first reversing valve (2) respectively.

3. The hydraulic control system of an convertible vehicle for roads and railways as claimed in claim 1, characterized in that a second check valve (12) for preventing oil from flowing back is arranged between the first reversing valve (2) and the oil cylinder (1), the energy storage assembly is connected with a first pressure sensor (13), and the oil cylinder (1) is connected with a second pressure sensor (14).

4. The station wagon hydraulic control system as claimed in claim 3, wherein the first pressure sensor (13), the second pressure sensor (14), the first reversing valve (2) and the proportional pressure reducing valve (3) are all electrically connected with a processor.

5. A convertible bus or train, characterized by comprising an oil pump (5), an oil tank (6) and the hydraulic control system of the convertible bus or train of any of claims 1 to 4, the oil pump (5) being in communication with the oil tank (6), the energy storage assembly being in communication with the oil pump (5).

6. The convertible vehicle for roads and railways as claimed in claim 5, characterized in that the oil pump (5) is directly electrically connected to the DC power supply system of the convertible vehicle for roads and railways.

7. An amphibian as claimed in claim 5, wherein a first check valve (7) for preventing oil backflow and a filter valve (8) for filtering oil are further provided between the energy storage assembly and the oil pump (5).

8. An intersection vehicle as claimed in claim 7, wherein a second reversing valve (9) is arranged between the filter valve (8) and the energy storage assembly, the second reversing valve (9) is connected with an overflow valve (10) used for controlling oil pressure, and the overflow valve (10) is communicated with the oil tank (6).

9. An amphibian as claimed in claim 8, wherein a reverse shuttle valve (11) is connected to the second direction valve (9), the energy storage assembly comprises at least two groups of accumulators (4), and the reverse shuttle valve (11) communicates with the at least two groups of accumulators (4) respectively.

10. An intersection vehicle as claimed in claim 9, further comprising a manifold block (15), wherein the first reversing valve (2), the proportional pressure reducing valve (3), the first check valve (7), the filter valve (8), the second reversing valve (9), the overflow valve (10) and the reverse shuttle valve (11) are all inserted into the manifold block (15).

11. A hydraulic control method for a combined vehicle for roads and railways is characterized in that the hydraulic control system for the combined vehicle for roads and railways is adopted, and the pressure reducing valve (31) is provided with a preset pressure;

when the pressure of an oil outlet of the pressure reducing valve (31) is lower than the preset pressure, an oil inlet of the pressure reducing valve (31) is supplemented with oil through the energy storage assembly; alternatively, the first and second electrodes may be,

when the pressure of an oil outlet of the reducing valve (31) is higher than the preset pressure, the control port of the reducing valve (31) overflows oil through the proportional overflow valve (32).

Technical Field

The invention relates to the technical field of hydraulic control, in particular to a dual-purpose vehicle for road and railway, a hydraulic control system of the dual-purpose vehicle for road and railway and a method thereof.

Background

The rail-road vehicle can run on a railway track and can also run on a common road. The highway-railway dual-purpose vehicle is generally provided with guide wheels on a chassis of the vehicle, and the guide wheels can be lifted or fallen at any time under the control of a hydraulic system, so that the highway-railway dual-purpose function of the vehicle is realized. However, the pressure between the guide wheels and the rail is too large or too small, which easily causes a problem of derailment of the vehicle.

In the prior art, an overflow valve is arranged on a main pipeline of a hydraulic system to control the extension and retraction of an oil cylinder, so that the lifting of a guide wheel is controlled. However, as the oil cylinder continuously does work, the oil pressure in the pipeline is gradually reduced, so that the pressure between the guide wheel and the track is smaller and smaller. If the opening degree of the overflow valve is increased, the initial pressure between the guide wheel and the track is too large. Therefore, the hydraulic system in the prior art cannot ensure a stable pressure between the guide wheel and the rail. In addition, in the prior art, the oil pump is driven by the fuel engine, the oil pump needs to work for a long time, and if the oil pump is powered by a storage battery, the electric energy consumption is too high due to the long-time work of the hydraulic system, so that the energy policy of energy conservation and emission reduction cannot be met.

Disclosure of Invention

In view of the above, the present invention is to overcome the defects in the prior art, and in a first aspect, a hydraulic control system for a convertible car for highway and railway is provided to solve a technical problem that an existing hydraulic system cannot ensure stable pressure between a guide wheel and a track.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a hydraulic control system of a convertible vehicle for road and railway comprises:

an energy storage assembly;

the oil cylinder is provided with a rod cavity and a rodless cavity;

the first reversing valve is respectively communicated with the rod cavity and the rodless cavity of the oil cylinder; and the number of the first and second groups,

the proportional pressure reducing valve comprises a pressure reducing valve and a proportional overflow valve, the pressure reducing valve is provided with an oil inlet, an oil outlet and a control port, the energy storage assembly is communicated with the oil inlet of the pressure reducing valve, the first reversing valve is communicated with the oil outlet of the pressure reducing valve, and the proportional overflow valve is communicated with the control port of the pressure reducing valve.

On the basis of the technical scheme, the hydraulic control system of the combined car can be further improved as follows.

Optionally, the energy storage assembly comprises at least two groups of energy accumulators, and each group of energy accumulators is communicated with at least two groups of oil cylinders through the proportional pressure reducing valve and the first reversing valve respectively.

Optionally, a second check valve for preventing oil from flowing back is arranged between the first reversing valve and the oil cylinder, the energy storage assembly is connected with a first pressure sensor, and the oil cylinder is connected with a second pressure sensor.

Optionally, the first pressure sensor, the second pressure sensor, the first reversing valve and the proportional pressure reducing valve are all electrically connected to a processor.

In a second aspect, the invention further provides a convertible bus for roads and railways, which comprises an oil pump, an oil tank and the hydraulic control system for the convertible bus for roads and railways, wherein the oil pump is communicated with the oil tank, and the energy storage assembly is communicated with the oil pump.

On the basis of the technical scheme, the combined car for the highway and the railway can be further improved as follows.

Optionally, the oil pump is directly connected with a direct current power supply system of the combined car.

Optionally, a first check valve for preventing oil from flowing back and a filter valve for filtering the oil are further arranged between the energy storage assembly and the oil pump.

Optionally, a second reversing valve is arranged between the filter valve and the energy storage assembly, the second reversing valve is connected with an overflow valve used for controlling the pressure of the oil liquid, and the overflow valve is communicated with the oil tank.

Optionally, the second reversing valve is connected to a reverse shuttle valve, the energy storage assembly includes at least two groups of energy accumulators, and the reverse shuttle valve is respectively communicated with the at least two groups of energy accumulators.

Optionally, the system further comprises an integrated block, and the first reversing valve, the proportional pressure reducing valve, the first one-way valve, the filter valve, the second reversing valve, the overflow valve and the reverse shuttle valve are all inserted into the integrated block.

In a third aspect, the invention also provides a hydraulic control method for a combined vehicle, which adopts the hydraulic control system for the combined vehicle, wherein the pressure reducing valve is provided with a preset pressure;

when the pressure of the oil outlet of the pressure reducing valve is lower than the preset pressure, the oil inlet of the pressure reducing valve is supplemented with oil through the energy storage assembly; alternatively, the first and second electrodes may be,

when the pressure of the oil outlet of the pressure reducing valve is higher than the preset pressure, the control port of the pressure reducing valve overflows oil through the proportional overflow valve.

Compared with the prior art, the hydraulic control system of the combined car for the highway and the railway provided by the invention has the beneficial effects that:

according to the invention, the proportional pressure reducing valve is arranged between the energy storage component and the first reversing valve, and when the pressure of the oil outlet of the pressure reducing valve is lower, the energy storage component supplements oil to the oil inlet of the pressure reducing valve so as to improve the pressure of the oil outlet of the pressure reducing valve; when the pressure of the oil outlet of the pressure reducing valve is high, the proportional overflow valve overflows oil through the control port of the pressure reducing valve to reduce the pressure of the oil outlet of the pressure reducing valve, so that the oil pressure of the oil cylinder is kept in dynamic balance all the time, and the pressure stability between the guide wheel and the rail is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a hydraulic control system of a combined vehicle for road and railway;

fig. 2 is a flow chart of a hydraulic control method of the combined car for road and railway of the invention.

In the figure:

1-oil cylinder; 2-a first reversing valve; 3-proportional pressure reducing valve; 31-a pressure reducing valve; 32-proportional relief valve; 4-an accumulator; 5-an oil pump; 6, an oil tank; 7-a first one-way valve; 8-a filter valve; 9-a second reversing valve; 10-an overflow valve; 11-shuttle valve reversal; 12-a second one-way valve; 13 — a first pressure sensor; 14 — a second pressure sensor; 15-integrated block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the invention and are not to be taken as a comprehensive embodiment. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Example 1:

the invention provides a hydraulic control system of a road-rail vehicle, which comprises an energy storage assembly, an oil cylinder 1, a first reversing valve 2 and a proportional pressure reducing valve 3, as shown in figure 1. The energy storage component comprises an energy accumulator 4, the oil cylinder 1 is provided with a rod cavity and a rodless cavity, and the proportional pressure reducing valve 3 comprises a pressure reducing valve 31 and a proportional overflow valve 32. The pressure reducing valve 31 is provided with an oil inlet, an oil outlet and a control port, the energy accumulator 4 is communicated with the oil inlet of the pressure reducing valve 31, the first reversing valve 2 is communicated with the oil outlet of the pressure reducing valve 31, and the proportional overflow valve 32 is communicated with the control port of the pressure reducing valve 31. The first reversing valve 2 is respectively communicated with a rod cavity and a rodless cavity of the oil cylinder 1 to control the telescopic action of the oil cylinder 1, and the oil cylinder 1 is connected with a guide wheel of the combined car.

Along with the continuous work of the oil cylinder 1, the pressure of oil in the oil cylinder 1 is gradually reduced, so that the pressure between the guide wheel and the rail is smaller and smaller. The oil in the accumulator 4 continuously flows into the oil inlet of the pressure reducing valve 31 to continuously supplement the pressure of the oil in the pressure reducing valve 31, so that the pressure of the oil flowing from the oil outlet of the pressure reducing valve 31 into the first reversing valve 2 is ensured. Meanwhile, the pressure of the pressure reducing valve 31 is increased along with the continuous pressure compensation of the accumulator 4, when the pressure of the oil at the oil outlet of the pressure reducing valve 31 exceeds a standard value, the oil flows into the proportional overflow valve 32 through the control port of the pressure reducing valve 31, and the redundant oil overflows from the proportional overflow valve 32.

According to the invention, through the pressure compensation of the energy accumulator 4 and the pressure relief of the proportional overflow valve 32, the oil pressure at the oil outlet of the pressure reducing valve 31 is kept in dynamic balance all the time, so that the oil pressure balance in the oil cylinder 1 can be ensured, the pressure error range between the guide wheel and the rail is controlled within 0.3Mpa, and the pressure stability between the guide wheel and the rail of the rail-road vehicle is ensured.

Example 2:

the invention also provides a combined car for road and railway, which comprises an oil pump 5, an oil tank 6, a first one-way valve 7, a filter valve 8 and the combined car for road and railway hydraulic control system in the embodiment shown in fig. 1. The oil tank 6 is communicated with the oil pump 5, the oil pump 5 is sequentially connected with the first check valve 7, the filter valve 8 and the energy accumulator 4, so that oil flows into the filter valve 8 to be filtered, and the first check valve 7 avoids backflow of the oil.

Wherein, the direct current power supply system electric connection with the combined car of highway and railway of oil pump 5 need not to set up fuel engine alone, reduces the consumption of the energy and the pollution of environment. The oil pump 5 is started, oil in the oil tank 6 is filtered by the first check valve 7 through the filter valve 8 and then flows into the energy accumulator 4 to be stored, and the oil has certain pressure in the energy accumulator 4. Of course, the oil pump 5 may also be driven by a dc motor.

When the pressure of the oil in the energy accumulator 4 is greater than the pressure of the oil outlet of the pressure reducing valve 31, the oil pump 5 can stop working, and the energy accumulator 4 stores higher pressure of the oil and can also be provided for other oil cylinders or parts such as a brake cylinder, a parking cylinder and the like. When the pressure of the oil in the energy accumulator 4 is smaller than the pressure of the oil outlet of the pressure reducing valve 31, the oil pump 5 is continuously started, the oil is supplemented to the energy accumulator 4 through the oil pump 5, the energy consumption can be reduced, and the energy is saved by more than 70%, so that the hydraulic control system of the rail-road dual-purpose vehicle has the characteristics of environmental friendliness, energy conservation and accurate control.

It can be understood that the energy storage assembly may also continuously deliver oil to the pressure reducing valve 31 in a manner that the oil pump 5 continuously applies work without using the energy storage 4, so as to ensure the oil pressure at the oil inlet of the pressure reducing valve 31. However, this method requires the oil pump 5 to continuously apply work, which is not favorable for saving energy, and also easily results in shortening the service life of the oil pump 5.

As shown in fig. 1, a second reversing valve 9 is arranged between the filter valve 8 and the energy accumulator 4, and the second reversing valve 9 is connected with an overflow valve 10 for controlling the pressure of the whole oil in the hydraulic control system of the combined rail-road vehicle, so as to avoid the safety problem of bursting of the system due to overlarge pressure. The overflow valve 10 is communicated with the oil tank 6, and the oil which enters the overflow valve 10 through the second reversing valve 9 flows back to the oil tank 6.

As shown in fig. 1, in particular, a first pressure sensor 13 is connected to the energy store 4 for monitoring the pressure of the oil in the energy store 4. An oil outlet of the proportional pressure reducing valve 3 is connected with a second pressure sensor 14 for monitoring the pressure of the oil in the oil cylinder 1. First pressure sensor 13, second pressure sensor 14, first switching-over valve 2, the equal electrically connected of proportional pressure reducing valve 3 and oil pump 5 has the treater, the treater is according to the oil hydraulic pressure force in the oil cylinder 1 of the oil pressure force of the energy storage ware 4 of first pressure sensor 13 feedback and the 14 feedback of second pressure sensor, control first switching-over valve 2, the action of parts such as proportional pressure reducing valve 3 and oil pump 5, thereby realize the remote control of dual-purpose car hydraulic control system of highway-railway, be convenient for the driver can directly adjust dual-purpose car hydraulic control system of highway-railway in the driver's cabin. The processor includes but is not limited to a processor such as a PLC or an MCU.

As shown in fig. 1, since the vehicle has at least four steerable wheels, the second directional control valve 9 is connected to a shuttle valve 11, and the shuttle valve 11 communicates with the two accumulators 4 and distributes the oil preferentially to the accumulators 4 having a lower pressure. Each group of energy accumulators 4 is respectively communicated with the two groups of oil cylinders 1 through a group of proportional pressure reducing valves 3 and a group of first reversing valves 2. A second check valve 12 for preventing oil from flowing back is provided between the first direction valve 2 and the cylinder 1.

It will be appreciated that depending on the number of steerable wheels and the driving conditions of the vehicle, for example the cornering situation, a greater number of sets of accumulators 4 may be connected through the shuttle valve 11, and a greater number of sets of proportional pressure reducing valves 3, first reversing valves 2 and cylinders 1 may also be connected per set of accumulators 4. The oil cylinder 1 can be an oil cylinder 1 for controlling guide wheels on the same side of the track, and can also be an oil cylinder 1 for controlling guide wheels on the same axle on two sides of the track.

As shown in fig. 1, in order to realize the miniaturization and modularization application of the hydraulic control system of the combined vehicle, the first reversing valve 2, the proportional pressure reducing valve 3, the first check valve 7, the filter valve 8, the second reversing valve 9, the overflow valve 10, the reverse shuttle valve 11 and the second check valve 12 are all inserted into the manifold block 15 by adopting the cartridge valve technology, so that the integration level of the hydraulic system is improved, and the volume of the hydraulic system is reduced.

Example 3:

the invention also provides a hydraulic control method for a combined car, as shown in fig. 2, by adopting the hydraulic control system for a combined car in the above embodiment, a preset pressure is set in the pressure reducing valve 31. And starting the oil pump 5, when the oil liquid of the energy accumulator 4 reaches an oil inlet of the pressure reducing valve 31, the valve core of the first reversing valve 2 is in the middle position, the oil cylinder 1 is at a stop fixed position, and at the moment, the oil cylinder 1 is in a first working state, namely the stop state.

When the left side of the first reversing valve 2 is electrified, the valve core moves to the right, oil at the oil outlet of the reducing valve 31 reaches the rod cavity of the oil cylinder 1 through the left oil port of the first reversing valve 2, a piston rod of the oil cylinder 1 is pushed to move upwards, and the guide wheel is driven to move upwards. The oil liquid in the rodless cavity of the oil cylinder 1 flows back to the oil tank 6 through the left oil port of the first reversing valve 2, and at the moment, the oil cylinder 1 is in a second working state, namely the lifting state.

When the right side of the first reversing valve 2 is electrified, the valve core moves leftwards, oil at the oil outlet of the reducing valve 31 reaches the rodless cavity of the oil cylinder 1 through the right oil port of the first reversing valve 2, a piston rod of the oil cylinder 1 is pushed to descend, and the guide wheel is driven to move downwards. The oil liquid in the rod cavity of the oil cylinder 1 flows back to the oil tank 6 through the right oil port of the first reversing valve 2, and the oil cylinder 1 is in a third working state at the moment, namely in a descending state.

When the guide wheel is lowered into contact with the rail, the cylinder 1 pressure begins to rise. When the pressure at the oil outlet of the pressure reducing valve 31 is higher than the preset pressure, the control port of the pressure reducing valve 31 overflows the oil through the proportional relief valve 32 to reduce the oil pressure in the oil cylinder 1. When the pressure of the oil outlet of the reducing valve 31 is lower than the preset pressure, the oil inlet of the reducing valve 31 is supplemented with oil through the energy accumulator 4, so that the pressure of the oil at the oil outlet of the reducing valve 31 is stabilized at the preset pressure, the fluctuation range is not more than 0.3Mpa, and the fourth working state is the pressure stabilization state of the oil cylinder 1.

The pressure of the energy storage 4 is monitored by a first pressure sensor 13, and the pressure of the oil cylinder 1 is monitored by a second pressure sensor 14. The monitored pressure value is fed back to the processor, the current or voltage value is provided for the proportional pressure reducing valve 3 through the processor, and the proportional pressure reducing valve 3 is opened, reduced or closed according to the current or voltage value, so that the function of stabilizing the working pressure of the oil cylinder 1 is achieved.

The hydraulic system adopts a direct-current power supply for control and driving, and is energy-saving and environment-friendly. The hydraulic control components and parts adopt a cartridge valve technology, and the hydraulic integration degree is high and the size is small. The pressure control of the oil cylinder 1 adopts the structural form of a proportional pressure reducing valve 3, which is different from the control mode of an overflow valve in the prior art, the invention can fully utilize the pressure of oil, avoid the problem of energy loss of the oil caused by the overflow of the overflow valve directly overflowing high-pressure oil, and ensure that the flow loss of the hydraulic oil is small. In addition, the pressure regulation and control of the invention are controlled and regulated by the processor and the electric appliance, and the operation is simple and convenient.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.