Hydraulic support control valve group

Abstract

The utility model discloses a hydraulic support control valve group relates to railway maintenance machinery hydraulic control technical field, it includes valve body, and the pressure reducing valve, throttle valve, reversing valve, hydraulic control check valve, pressure tap and pressure sensor are installed on the valve body, the valve body includes six external oil port, is oil port A, oil port B, oil port P, oil port T, oil port X and oil port M respectively, oil port A of valve body with the oil outlet of hydraulic control check valve intercommunication, and the oil channel between oil port A and the oil outlet of hydraulic control check valve still with oil port X of valve body intercommunication, oil port P of valve body with the oil inlet of pressure reducing valve intercommunication, oil port T of valve body is connected with the oil outlet of pressure reducing valve, throttle valve's oil port T1 intercommunication respectively, the oil outlet of pressure reducing valve is connected with oil port M of valve body, throttle valve's oil inlet intercommunication respectively, oil port A1 of reversing valve with the oil inlet of hydraulic control check valve intercommunication, oil port B1 of reversing valve with the control port of hydraulic control check valve intercommunication, oil port P1 of reversing valve with the oil outlet of throttle valve intercommunication.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology for railway maintenance machinery, specifically a hydraulic support control valve group. Background Technology

[0002] Due to the requirements for operational stability and safety, railway engineering machinery bogies are equipped with elastic support elements to absorb vibrations during high-speed operation. However, these elastic support elements can alter the working reference during operation, affecting performance. Therefore, a support cylinder is needed between the rigid bogie structure and the car body to shield the elastic support elements during operation. Most support cylinders are single-acting. During operation, oil enters the rodless chamber of the hydraulic cylinder, pushing the piston rod to extend and transform the bogie and car body into a rigid, integrated structure. During high-speed operation, the rodless chamber is connected to the oil tank, and the piston rod retracts under the weight of the car body or the action of a return spring, engaging the elastic support elements of the bogie to improve operational stability.

[0003] Traditional hydraulic cylinder control uses two-position two-way, two-position three-way, or two-position four-way directional valves to control the pressure build-up and unloading of the hydraulic cylinder. A check valve is added to the oil inlet of the solenoid valve for locking, and the oil return from the cylinder goes directly to the hydraulic oil tank when depressurization occurs. This control method has two problems: first, if the solenoid valve is suddenly de-energized, the hydraulic cylinder will descend rapidly under the weight of the vehicle, damaging the working equipment; second, if the directional valve core locks or the control circuit malfunctions, the vehicle may be driven without unloading the hydraulic cylinder, posing a safety risk.

[0004] Therefore, it is necessary to design a hydraulic support control valve group to ensure that the support cylinder remains locked when the electromagnetic system is de-energized in case of abnormal conditions. At the same time, it can interlock the support cylinder with the electrical program stroke to prevent high-speed driving when the support cylinder is not retracted. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a hydraulic support control valve group that prevents the support cylinder from suddenly falling due to control signal failure during operation, and can be interlocked with the travel mechanism to improve vehicle operation safety.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hydraulic support control valve assembly, comprising a valve body, on which a pressure reducing valve, a throttle valve, a reversing valve, a hydraulically controlled check valve, a pressure testing connector, and a pressure sensor are mounted; the valve body includes six external oil ports, namely oil port A, oil port B, oil port P, oil port T, oil port X, and oil port M; oil port A of the valve body is connected to the oil outlet of the hydraulically controlled check valve, and the oil between oil port A and the oil outlet of the hydraulically controlled check valve is... The valve body is also connected to the oil port X of the valve body; the oil port P of the valve body is connected to the oil inlet of the pressure reducing valve; the oil port T of the valve body is connected to the drain port of the pressure reducing valve and the oil port T1 of the directional valve respectively; the oil outlet of the pressure reducing valve is connected to the oil port M of the valve body and the oil inlet of the throttle valve respectively; the oil port A1 of the directional valve is connected to the oil inlet of the hydraulic check valve, the oil port B1 of the directional valve is connected to the control port of the hydraulic check valve, and the oil port P1 of the directional valve is connected to the oil outlet of the throttle valve.

[0007] A further improvement is that it also includes a pressure testing connector, which is connected to the oil port of the valve body via an M-thread.

[0008] A further improvement is that it also includes a pressure sensor, which is threadedly connected to the oil port X of the valve body.

[0009] A further improvement is that the pressure reducing valve is inserted into the oil port P of the valve body, and the throttle valve, the hydraulic check valve, and the directional valve are stacked sequentially on the pressure reducing valve.

[0010] A further improvement is that the directional valve is a three-position four-way solenoid directional valve or a three-position four-way electro-hydraulic directional valve with a Y-position function in the middle position.

[0011] A further improvement is that the oil port A of the valve body is connected to the rodless chamber of the support cylinder.

[0012] A further improvement is made by sealing the oil port B of the valve body.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention enables the support cylinder to prevent it from suddenly falling off during operation due to control signal failure, and it can be interlocked with the travel mechanism to improve vehicle operation safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the hydraulic support control valve assembly in an embodiment of this utility model;

[0016] Figure 2 This is a perspective view of the hydraulic support control valve assembly in an embodiment of this utility model;

[0017] Figure 3 This is a front view of the hydraulic support control valve assembly in an embodiment of this utility model;

[0018] Figure 4 This is a side view of the hydraulic support control valve assembly in an embodiment of this utility model.

[0019] Figure label:

[0020] 1-Valve body; 2-Pressure reducing valve; 3-Throttle valve; 4-Directional control valve; 5-Hydraulic check valve; 6-Pressure test connector; 7-Pressure sensor. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0022] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this utility model, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0027] See Figures 1-4 As shown, this embodiment of the utility model provides a hydraulic support control valve assembly, including a valve body 1. A pressure reducing valve 2, a throttle valve 3, a directional valve 4, a hydraulically controlled check valve 5, a pressure testing connector 6, and a pressure sensor 7 are mounted on the valve body 1. Specifically, the pressure reducing valve 2 is inserted into the oil port P of the valve body 1, and the throttle valve 3, the hydraulically controlled check valve 5, and the directional valve 4 are sequentially stacked on the pressure reducing valve 2. The directional valve 4 is a three-position four-way solenoid directional valve or a three-position four-way electro-hydraulic directional valve with a neutral position of Y.

[0028] Valve body 1 includes six external oil ports: port A, port B, port P, port T, port X, and port M. Port A of valve body 1 is connected to the outlet of hydraulic check valve 5, and the oil passage between port A and the outlet of hydraulic check valve 5 is also connected to port X of valve body 1. Specifically, port A of valve body 1 is connected to the rodless chamber of the support cylinder. Port B of valve body 1 is blocked. Port P of valve body 1 is connected to the inlet of pressure reducing valve 2; port T of valve body 1 is connected to the drain port of pressure reducing valve 2 and port T1 of directional valve 4, respectively.

[0029] The outlet of pressure reducing valve 2 is connected to port M of valve body 1 and the inlet of throttle valve 3, respectively; port A1 of directional valve 4 is connected to the inlet of hydraulic check valve 5, port B1 of directional valve 4 is connected to the control port of hydraulic check valve 5, and port P1 of directional valve 4 is connected to the outlet of throttle valve 3. Specifically, the hydraulic support control valve assembly also includes a pressure testing connector 6, which is threadedly connected to port M of valve body 1. The hydraulic support control valve assembly also includes a pressure sensor 7, which is threadedly connected to port X of valve body 1.

[0030] The pressure reducing valve regulates the system pressure entering the support cylinder based on the working pressure of the support cylinder. The throttle valve is used to regulate the extension speed of the support cylinder. When the solenoid directional valve is in the parallel position, the support cylinder extends; when the solenoid valve is in the cross position, the support cylinder retracts; and when the solenoid directional valve is de-energized and in the neutral position, the support cylinder is locked. When the solenoid directional valve is in the parallel position, the pressure oil at port P1 flows through port A1 to open the hydraulic check valve and enter the support cylinder, pushing the piston rod out. When the solenoid directional valve is in the cross position, the pressure oil at port P1 flows through port B1 to the control port of the hydraulic check valve, opening the hydraulic check valve. The hydraulic oil in the rodless chamber of the support cylinder flows in the reverse direction through the opened hydraulic check valve, then through port A1 of the solenoid directional valve to port T1, and finally through port T of the valve body to the hydraulic oil tank, causing the piston rod of the support cylinder to retract. When the solenoid directional valve is in the neutral position, the pressure oil at port P1 is blocked, and both the control port and the inlet of the hydraulic check valve are connected to port T of the valve body. The hydraulic check valve is in a reverse locked state, preventing the hydraulic oil in the rodless chamber of the support cylinder from being discharged, and the cylinder is in a locked state. The pressure test connector is used for quick connection with a pressure gauge to display the pressure of the support cylinder system, facilitating pressure adjustment by the pressure reducing valve. The pressure sensor is used to monitor the pressure of the support cylinder and determine whether the support cylinder is in a supported state, thus forming a logical interlock with the operation and travel. When the pressure sensor detects that the cylinder is in a supported state, high-speed travel cannot be performed, and when the pressure sensor detects that the cylinder is in a non-supported state, operation cannot be performed.

[0031] When the oil supply pressure at port P of the hydraulic support control valve assembly 1 exceeds the working pressure of the support cylinder, the pressure reducing valve 2 lowers the supply pressure to its set value to prevent excessive pressure from damaging the support cylinder. The throttle valve 3 regulates the flow rate entering the support cylinder, thereby controlling the extension speed of the support cylinder. The solenoid directional valve 4 switches the oil circuit to control the filling and discharging of the support cylinder.

[0032] The working principle of this utility model is as follows:

[0033] During the vehicle body support operation, solenoid directional valve 4's electromagnet a is energized and b is de-energized, and the solenoid directional valve operates in the parallel position. Hydraulic oil from port P of valve body 1 is depressurized by pressure reducing valve 2 and throttle valve 3 before entering port P1 of solenoid directional valve 1. It then passes through port A1 to hydraulic check valve 5 and enters the rodless chamber of the support cylinder from the A inlet pipe of valve body 1. Under the action of pressurized oil, the support cylinder pushes the piston rod to extend and support the vehicle body, thus disabling the elastic support function of the bogie. Pressure sensor 7 transmits the pressure signal to the control module, allowing the working mechanism to proceed to the next action. Simultaneously, the high-speed travel gear shifting program receives a control signal indicating that the support cylinder is in the supported state, preventing high-speed gear shifting and ensuring the vehicle cannot travel at high speed, thus preventing safety accidents caused by high-speed travel under rigid support.

[0034] When the vehicle body is not under support, the solenoid valve 4 de-energizes electromagnet a and energizes electromagnet b, and the solenoid valve operates in the cross position. The hydraulic oil at port P of valve body 1 is de-energized by pressure reducing valve 2 and throttle valve 3, and then enters port P1 of solenoid valve 1. It then goes through port B1 to the control port of hydraulic check valve 5 to open hydraulic check valve 5. The pressure oil in the rodless chamber of the support cylinder goes through the pipeline to port A of valve body 1, then through hydraulic check valve 5, port A1 of solenoid valve 4 to port T1, and then through port T of valve body back to the hydraulic oil tank. Under the weight of the vehicle body or the action of the cylinder return spring, the support cylinder pushes the piston rod to retract, the vehicle body falls, and the elastic support function of the bogie is unlocked.

[0035] When the electromagnet of the solenoid directional valve 4 suddenly loses power, the valve core returns to the neutral position under the action of the return springs at both ends. Both oil ports A1 and B1 of the solenoid directional valve 4 are connected to the oil tank, the hydraulic control check valve 5 is in the closed state, the hydraulic oil in the rodless chamber of the support cylinder cannot be discharged, and the cylinder piston rod will not retract under the weight of the vehicle or the action of the cylinder return spring, preventing the frame from suddenly falling and damaging the working equipment when the working mechanism is not retracted.

[0036] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. A hydraulic support control valve assembly, comprising a valve body (1), characterized in that: The valve body (1) is equipped with a pressure reducing valve (2), a throttle valve (3), a reversing valve (4), a hydraulic check valve (5), a pressure testing connector (6), and a pressure sensor (7); The valve body (1) includes six external oil ports, namely oil port A, oil port B, oil port P, oil port T, oil port X and oil port M; The oil port A of the valve body (1) is connected to the oil outlet of the hydraulic control check valve (5), and the oil passage between the oil port A and the oil outlet of the hydraulic control check valve (5) is also connected to the oil port X of the valve body (1). The oil port P of the valve body (1) is connected to the oil inlet of the pressure reducing valve (2); The oil port T of the valve body (1) is connected to the oil drain port of the pressure reducing valve (2) and the oil port T1 of the reversing valve (4), respectively. The oil outlet of the pressure reducing valve (2) is connected to the oil port M of the valve body (1) and the oil inlet of the throttle valve (3), respectively. The oil port A1 of the reversing valve (4) is connected to the oil inlet of the hydraulic control check valve (5), the oil port B1 of the reversing valve (4) is connected to the control port of the hydraulic control check valve (5), and the oil port P1 of the reversing valve (4) is connected to the oil outlet of the throttle valve (3).

2. The hydraulic support control valve assembly according to claim 1, characterized in that: It also includes a pressure test connector (6), which is threaded to the oil port of the valve body (1).

3. The hydraulic support control valve assembly according to claim 1, characterized in that: It also includes a pressure sensor (7), which is threaded to the oil port X of the valve body (1).

4. The hydraulic support control valve assembly according to claim 1, characterized in that: The pressure reducing valve (2) is inserted into the oil port P of the valve body (1), and the throttle valve (3), the hydraulic check valve (5) and the reversing valve (4) are stacked on the pressure reducing valve (2) in sequence.

5. The hydraulic support control valve assembly according to claim 1, characterized in that: The reversing valve (4) is a three-position four-way solenoid reversing valve or a three-position four-way electro-hydraulic reversing valve with a Y-position function in the middle position.

6. The hydraulic support control valve assembly according to claim 1, characterized in that: The oil port A of the valve body (1) is connected to the rodless chamber of the support cylinder.

7. The hydraulic support control valve assembly according to claim 1, characterized in that: The oil port B of the valve body (1) is sealed.

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