Control valve group for grinding head of steel rail grinding wagon and steel rail grinding wagon

Abstract

According to the control valve set for the grinding head of the steel rail grinding wagon and the steel rail grinding wagon, when a reversing valve is powered on, a rodless cavity or a rod cavity of a hydraulic oil cylinder is controlled to communicate with an output oil port of a proportional pressure control valve, and the proportional pressure control valve outputs pressure to control the pressure of the rodless cavity or the rod cavity of the hydraulic oil cylinder; the output pressure of the proportional pressure control valve is adjusted through an electric signal, and the proportional pressure control valve and a constant-pressure source of a rod cavity or a rodless cavity of the hydraulic oil cylinder act together to jointly control the output force of the hydraulic oil cylinder, so that accurate control over the polishing head is achieved, and the output power of the polishing head is stable. When the reversing valve loses power, the rodless cavity or the rod cavity of the hydraulic oil cylinder is communicated with a pressure oil source, the hydraulic oil cylinder can be driven to stretch out and draw back through a constant pressure source, pressure control over the polishing head can be achieved during power losing, danger caused by falling of the polishing head is prevented, and the safety of a valve set is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic control, in particular to a control valve group for a rail grinding head of a rail grinding vehicle and the rail grinding vehicle. BACKGROUND

[0002] The current main methods for the down pressure control of the rail grinding head of a rail grinding vehicle are pneumatic and hydraulic. The SPENO company adopts a pneumatic system to drive a cylinder to provide down pressure, and the HARSCO company adopts a hydraulic system to control the down pressure cylinder to provide equivalent oil pressure, and the lift pressure difference is generated by the area difference of the down pressure cylinder, and the final cylinder acting force is the down pressure, and the size of the final cylinder acting force can be adjusted by a front proportional pressure reducing valve.

[0003] The above-mentioned down pressure control scheme of the rail grinding head of the rail grinding vehicle is adjusted by a single proportional pressure reducing valve, and the output force cannot be accurately controlled, the output power of the grinding head is unbalanced, and the grinding quality of the rail grinding vehicle is unstable. SUMMARY

[0004] The control valve group for the rail grinding head of the rail grinding vehicle and the rail grinding vehicle provided in the embodiments of the present application solve the problem that the output force adjustment by the cylinder and the proportional pressure reducing valve is not accurate and the output power of the grinding head cannot be stably output.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A control valve group for a rail grinding head of a rail grinding vehicle, comprising a control valve assembly connected with a hydraulic cylinder for driving a grinding head to perform a grinding action, the control valve assembly comprising:

[0007] a proportional pressure control valve and a reversing valve, an input oil port of the proportional pressure control valve being connected with a pressure oil source and a return oil source respectively, an output oil port of the proportional pressure control valve being connected with an input oil port of the reversing valve, an output oil port of the reversing valve being connected with one of a rodless cavity and a rod cavity of the hydraulic cylinder, the other of the rodless cavity and the rod cavity of the hydraulic cylinder being connected with a constant pressure source;

[0008] when the reversing valve is powered, the hydraulic cylinder is controlled to communicate with the output oil port of the proportional pressure control valve; when the reversing valve is not powered, the hydraulic cylinder is controlled to communicate with the return oil source.

[0009] Optionally, a valve body is further included, and a plurality of groups of the control valve assemblies are integrated on the valve body, and each of the control valve assemblies corresponds to the hydraulic cylinder one by one.

[0010] Optionally, a pressure detection assembly is further included, and the pressure detection assembly is integrated on the valve body and is used for detecting the oil pressure of the output oil port of each of the proportional pressure control valves.

[0011] Optionally, the reversing valve is a two-position four-way reversing valve.

[0012] Optionally, the pressure oil source is connected with an oil tank.

[0013] Optionally, the pressure oil source is connected with the constant pressure source.

[0014] The constant pressure source is provided with an energy storage device.

[0015] Optionally, the pressure regulating range of the proportional pressure control valve is 0-175 bar.

[0016] Optionally, the control valve assembly is 1-12 groups.

[0017] The application provides a rail grinding car, which comprises the control valve group for the rail grinding car grinding head according to any one of the above embodiments.

[0018] The control valve group for the rail grinding car grinding head provided by the application comprises a control valve assembly, which is connected with a hydraulic cylinder for driving the grinding head to perform a grinding action, and the control valve assembly comprises a proportional pressure control valve and a reversing valve, an input oil port of the proportional pressure control valve is connected with a pressure oil source and a return oil source respectively, an output oil port of the proportional pressure control valve is connected with an input oil port of the reversing valve, an output oil port of the reversing valve is connected with one of a rodless cavity and a rod cavity of the hydraulic cylinder, and the other of the rodless cavity and the rod cavity of the hydraulic cylinder is connected with a constant pressure source; when the reversing valve is powered, the hydraulic cylinder is in communication with the output oil port of the proportional pressure control valve; when the reversing valve loses power, the hydraulic cylinder is in communication with the return oil source.

[0019] Compared with the prior art, the control valve group for the rail grinding car grinding head and the rail grinding car provided in the application have the following technical effects:

[0020] When the reversing valve is powered, the rodless cavity or the rod cavity of the hydraulic cylinder is in communication with the output oil port of the proportional pressure control valve, the proportional pressure control valve outputs pressure to control the rodless cavity of the hydraulic cylinder, the output pressure of the proportional pressure control valve is adjusted through an electric signal, and the constant pressure source of the rodless cavity or the rod cavity of the hydraulic cylinder is used to jointly control the output force of the hydraulic cylinder, so as to realize accurate control of the grinding head and stabilize the output power of the grinding head.

[0021] When the reversing valve loses power, the rodless cavity or the rod cavity of the hydraulic cylinder is in communication with the pressure oil source, and the constant pressure source can drive the hydraulic cylinder to extend and retract, so as to realize pressure control of the grinding head when the power is lost, prevent the grinding head from falling and causing danger, and improve the safety of the valve group. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0023] Figure 1 A hydraulic control principle diagram of a control valve group for a rail grinding head is provided for the embodiments of the application;

[0024] Figure 2 A structural schematic diagram of a valve body is provided for the application.

[0025] The reference signs in the drawings are as follows:

[0026] Proportional pressure control valve 1, reversing valve 2, valve body 4, pressure detection assembly 5. DETAILED DESCRIPTION

[0027] The embodiments of the application disclose a control valve group for a rail grinding head and a rail grinding vehicle, which adjusts the output force through an oil cylinder and a proportional pressure reducing valve, solves the problem of inaccurate output force adjustment and unstable output of the grinding head output power.

[0028] In order to make the technical solutions and advantages of the embodiments of the application clearer, the exemplary embodiments of the application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0029] Please refer to Figures 1-2 , Figure 1 A hydraulic control principle diagram of a control valve group for a rail grinding head is provided for the embodiments of the application; wherein 1 / 1, 1 / 2, 1 / 3, 1 / 4, 1 / 5… are proportional pressure control valves 1 respectively, 2 / 1, 2 / 2, 2 / 3, 2 / 4, 2 / 5… are reversing valves 2 respectively, 3 / 1, 3 / 2, 3 / 3, 3 / 4, 3 / 5… are hydraulic oil cylinders respectively. Figure 2 A structural schematic diagram of a valve body 4 is provided for the application.

[0030] In a specific embodiment, the control valve group for a rail grinding head provided by the application comprises a control valve assembly, which is connected with a hydraulic oil cylinder for driving the grinding head to perform a grinding action, and the control valve assembly comprises:

[0031] The proportional pressure control valve 1 and the reversing valve 2, the input oil port of the proportional pressure control valve 1 is connected with the pressure oil source and the return oil source respectively, the output oil port of the proportional pressure control valve 1 is connected with the input oil port of the reversing valve 2, the output oil port of the reversing valve 2 is connected with one of the rodless cavity or the rod cavity of the hydraulic cylinder, and the other of the rodless cavity and the rod cavity of the hydraulic cylinder is connected with the constant pressure source;

[0032] The input oil port of the proportional pressure control valve 1 is connected with the pressure oil source P and the return oil source T respectively, the output oil port of the proportional pressure control valve 1 is connected with the input oil port of the reversing valve 2, the output oil port of the reversing valve 2 is connected with the rodless cavity (the rod cavity) of the hydraulic cylinder, and the rodless cavity (the rod cavity) of the hydraulic cylinder is communicated with the output oil port of the proportional pressure control valve 1 or the return oil source T by the energization or de-energization of the electromagnet of the reversing valve 2; specifically, when the reversing valve 2 is energized, the rodless cavity (the rod cavity) of the hydraulic cylinder is communicated with the output oil port of the proportional pressure control valve 1, the output oil port of the proportional pressure control valve 1 controls the pressure of the rodless cavity (the rod) of the hydraulic cylinder, the output pressure of the proportional pressure control valve 1 is adjusted by the electric signal, and the output force control of the hydraulic cylinder is realized by the joint action of the constant pressure source S communicated with the cylinder cavity of the hydraulic cylinder; when the reversing valve 2 is de-energized, the rodless cavity (the rod cavity) of the hydraulic cylinder is communicated with the return oil source T, the hydraulic cylinder can be driven to stretch and retract by the constant pressure source S, the pressure control of the polishing head is realized at the time of de-energization, the danger caused by the falling of the polishing head is prevented, and the safety of the valve group is improved.

[0033] Compared with the prior art, the control valve group for the polishing head of the rail polishing vehicle and the rail polishing vehicle provided in the embodiments have the following technical effects:

[0034] When the reversing valve 2 is energized, the rodless cavity or the rod cavity of the hydraulic cylinder is communicated with the output oil port of the proportional pressure control valve 1, the output pressure of the proportional pressure control valve 1 controls the pressure of the rodless cavity or the rod cavity of the hydraulic cylinder, the output pressure of the proportional pressure control valve 1 is adjusted by the electric signal, and the output force control of the hydraulic cylinder is realized by the joint action of the constant pressure source of the rodless cavity or the rod cavity of the hydraulic cylinder, so as to realize the accurate control of the polishing head and stabilize the output power of the polishing head.

[0035] When the reversing valve 2 is de-energized, the rodless cavity or the rod cavity of the hydraulic cylinder is communicated with the pressure oil source, the hydraulic cylinder can be driven to stretch and retract by the constant pressure source, the pressure control of the polishing head is realized at the time of de-energization, the danger caused by the falling of the polishing head is prevented, and the safety of the valve group is improved.

[0036] Specifically, the control valve group further comprises a valve body 4, a plurality of control valve assemblies are integrated through the valve body 4 to realize the integration of the control valve, and each control valve assembly corresponds to a hydraulic cylinder. Thus, the integration degree of the device is improved, all control components are installed on the valve block, the volume is small, space is saved, and layout is facilitated; and the modular design can be applied to different grinding heads of the polishing device.

[0037] In an alternative embodiment, the control valve group further comprises a pressure detection assembly 5 corresponding to each proportional pressure control valve 1, which is integrated on the valve body 4, preferably with the pressure measuring point integrated on the valve body 4, to detect the oil pressure of the output port of each proportional pressure control valve 1 to achieve accurate control. In this embodiment, the pressure detection assembly 5 is a pressure sensor to detect the oil pressure.

[0038] In an alternative embodiment, the reversing valve 2 is a two-position four-way reversing valve 2, each proportional pressure control valve 1, two-position four-way electromagnetic valve and hydraulic cylinder can form a down pressure circuit, the pressure oil source P is connected with the oil tank, the pressure oil source P is connected with the constant pressure source S, and the constant pressure source S is provided with an energy storage device. In other embodiments, the reversing valve 2 can be set as needed as long as the same technical effect is achieved, and the specific type of the reversing valve 2 is not limited.

[0039] In an alternative embodiment, the pressure regulating range of the proportional pressure control valve 1 is 0-175 bar, which can be applied to different hydraulic control scenarios to improve the versatility of the valve group; at the same time, the number of control valve assemblies is 1-12, preferably 10, and the number of control valve assemblies can be set as needed.

[0040] When the above-mentioned control valve group is used in different hydraulic cylinder systems of the same pump source, the valve group controls the output force of the hydraulic cylinder to make the power of the polishing head stable and ensure the polishing quality of the rail polishing vehicle stable.

[0041] Based on the control valve group for the rail polishing vehicle head provided in the above-mentioned embodiments, the application further provides a rail polishing vehicle comprising any one of the control valve groups for the rail polishing vehicle head in the above-mentioned embodiments. Since the rail polishing vehicle adopts the control valve group for the rail polishing vehicle head in the above-mentioned embodiments, the beneficial effects of the rail polishing vehicle are described with reference to the above-mentioned embodiments.

[0042] Although the preferred embodiments of the application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the application.

[0043] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A control valve group for a rail grinding head of a rail grinding vehicle, characterized in that The control valve assembly is connected with a hydraulic cylinder for driving a grinding head to perform a grinding action, and comprises: a proportional pressure control valve and a reversing valve, an input port of the proportional pressure control valve is connected with a pressure oil source and an oil return source respectively, an output port of the proportional pressure control valve is connected with an input port of the reversing valve, an output port of the reversing valve is connected with one of a rodless chamber and a rod chamber of the hydraulic cylinder, and the other of the rodless chamber and the rod chamber of the hydraulic cylinder is connected with a constant pressure source; when the reversing valve is powered, the hydraulic cylinder is controlled to communicate with the output port of the proportional pressure control valve; and when the reversing valve is not powered, the hydraulic cylinder is controlled to communicate with the oil return source.

2. The control valve group for the grinding head of the rail grinding car according to claim 1, characterized in that, The valve body is further provided with a plurality of groups of the control valve assemblies, and each of the control valve assemblies corresponds to one of the hydraulic cylinders.

3. The control valve group for the grinding head of the rail grinding car according to claim 2, characterized in that, A pressure detection assembly is further integrated on the valve body, and is used for detecting the oil pressure of the output port of each of the proportional pressure control valves.

4. The control valve group for the grinding head of the rail grinding car according to claim 1, characterized in that, The reversing valve is a two-position four-way reversing valve.

5. The control valve group for the grinding head of the rail grinding car according to claim 4, characterized in that, The pressure oil source is connected with an oil tank.

6. The control valve group for the grinding head of the rail grinding car according to claim 5, characterized in that, The pressure oil source is connected with the constant pressure source. An energy storage device is arranged in the constant pressure source.

7. The control valve group for the grinding head of the rail grinding car according to claim 1, characterized in that, The pressure regulating range of the proportional pressure control valve is 0-175 bar.

8. The control valve group for the grinding head of the rail grinding car according to claim 1, characterized in that, The control valve assembly is 1-12 groups.

9. A rail grinding vehicle characterized by, The control valve assembly is 1-12 groups.

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