Hydraulic test system for railway vehicle

Abstract

The utility model provides a hydraulic test system for a railway vehicle, which relates to the technical field of hydraulic tests for railway vehicles and comprises an oil source, a hydraulic test system and a hydraulic test system, oil inlet pipelines of the hydraulic vibration tables are all communicated with an oil source; and the plurality of pressure reducing valve block assemblies are respectively arranged between the oil source and the oil inlet pipelines of the plurality of hydraulic vibration tables, and the plurality of pressure reducing valve block assemblies are configured to respectively adjust the oil inlet pressure of the plurality of hydraulic vibration tables according to the test loads of the plurality of hydraulic vibration tables so as to control the maximum output force of the actuators of the plurality of hydraulic vibration tables.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic testing of rail vehicles, and more particularly to a hydraulic testing system for rail vehicles. Background Art

[0002] Test vibration tables suitable for rail transit vehicle performance testing have large loads, a wide range of load weight variations, and relatively expensive test pieces. For example, a vehicle body vibration table can have a maximum load weight of 55 tons, but when the test piece is a body-in-white, it may weigh less than 20 tons. When constructing a vibration table, the relevant actuators, oil pressure, etc. must be selected based on the maximum load index to meet the maximum load index requirements. However, high oil pressure causes high output force of the actuator, which can easily damage the vibration table and test piece when the hydraulic test system loses control. Therefore, the safety protection of the hydraulic vibration table must be considered when constructing the hydraulic vibration table. In addition, some laboratories have multiple hydraulic vibration tables and vibration tables that use hydraulic loading devices. From a cost perspective, multiple hydraulic vibration tables use one oil source with a constant oil supply pressure.

[0003] Currently, the use of additional limit protection can protect the test piece, vibration table, and test personnel by implementing different protective actions when the hydraulic test system exceeds the limit. However, this method of additional limit protection can only work properly under the premise that all components of the hydraulic test system, such as the detection mechanism and the actuator, are functioning properly. If any component of the hydraulic test system fails, the protection mechanism will be ineffective. Therefore, under extreme working conditions and when the hydraulic test system loses control, the protection mechanism will also fail, still causing losses. Utility Model Content

[0004] In view of this, in order to solve at least one of the technical problems in the prior art, the utility model provides a hydraulic testing system for rail vehicles, which can control the maximum output force of the actuators of multiple hydraulic vibration tables to achieve protection for the hydraulic vibration tables or test pieces.

[0005] One aspect of the present invention provides a hydraulic testing system for rail vehicles, comprising: an oil source; a plurality of hydraulic vibration tables, wherein the oil inlet pipelines of the plurality of hydraulic vibration tables are all connected to the oil source; and a plurality of pressure reducing valve block assemblies, respectively arranged between the oil source and the oil inlet pipelines of the plurality of hydraulic vibration tables, wherein the plurality of pressure reducing valve block assemblies are configured to adjust the oil inlet pressure of the plurality of hydraulic vibration tables according to the test loads of the plurality of hydraulic vibration tables, so as to control the maximum output force of the actuators of the plurality of hydraulic vibration tables.

[0006] According to some embodiments of the present invention, each of the above-mentioned pressure reducing valve block assemblies includes: a valve block body, including an oil inlet hole and an oil outlet hole, the above-mentioned oil inlet hole is connected to the main oil supply pipeline of the above-mentioned oil source, and the above-mentioned oil outlet hole is connected to the oil inlet pipeline of the above-mentioned hydraulic vibration table; and an electromagnetic reversing mechanism, which is arranged on the above-mentioned valve block body, and the above-mentioned electromagnetic reversing mechanism includes a pressure control unit, and the above-mentioned pressure control unit is configured to connect the fluid channel between the above-mentioned oil inlet hole and the above-mentioned oil outlet hole according to the pressure of the above-mentioned oil outlet hole and limit the pressure of the above-mentioned oil outlet hole to not exceed a threshold pressure.

[0007] According to some embodiments of the present invention, the electromagnetic reversing mechanism further includes: an electromagnetic reversing valve, comprising: a first inlet, configured to be connected to the oil inlet hole through an oil pipeline; an electromagnetic coil, configured to be energized to generate a magnetic field; a first valve core, one end of the first valve core being connected to the electromagnetic coil, and the first valve core being configured to be connected to the oil pipeline and the first outlet connected to the pressure control unit under the drive of the magnetic field; and a first elastic member, connected to the other end of the first valve core, and the first elastic member being configured to drive the first valve core to move when the electromagnetic coil is de-energized to close the oil pipeline.

[0008] According to some embodiments of the present invention, the pressure control unit includes: a second valve core; a second inlet, configured to be connected to the first outlet; the second outlet, configured to be connected to an external oil storage device; a third inlet, configured to be connected to the oil outlet hole, so that a portion of the oil flowing out of the oil outlet hole enters the pressure control unit, thereby pushing the second valve core to move, wherein, when the pressure flowing out of the oil outlet hole is greater than the threshold pressure of the pressure control unit, the second valve core moves to open the second outlet; and a second elastic member, connected to the second valve core, and the second elastic member is configured to drive the second valve core to move when the pressure flowing out of the oil outlet hole is not greater than the threshold pressure of the pressure control unit, so that the second outlet is closed.

[0009] According to some embodiments of the present invention, the pressure control unit further includes: an adjusting screw, which is provided on the second elastic member, and the adjusting screw is configured to adjust the preload of the second elastic member according to the test loads of the plurality of hydraulic vibration tables so as to set the pressure control unit to have different threshold pressures.

[0010] According to some embodiments of the present invention, the valve block body includes: a third valve core, which is arranged in the fluid conduit between the oil inlet hole and the oil outlet hole; and a third elastic member, which is connected to the third valve core. The third elastic member is configured to use elastic force to drive the third valve core to move when the second outlet is opened, so that the fluid channel between the oil inlet hole and the oil outlet hole is connected and the pressure of the oil outlet hole is limited to not exceed a threshold pressure.

[0011] According to some embodiments of the present invention, when the pressure flowing out of the above-mentioned oil outlet hole is greater than the threshold pressure of the above-mentioned pressure control unit, the upper end surface of the above-mentioned third elastic member is connected to the above-mentioned external oil storage device through the above-mentioned electromagnetic reversing valve and the above-mentioned pressure control unit to form an oil leakage circuit to transport the oil on the upper end surface of the above-mentioned third elastic member to the above-mentioned external oil storage device.

[0012] According to some embodiments of the present invention, the hydraulic testing system further includes: a pilot oil circuit, one end of the pilot oil circuit being connected to the oil inlet hole, and the other end of the pilot oil circuit being connected to the upper end surface of the third elastic member, and the pilot oil circuit being configured to allow a portion of the oil in the main oil supply pipeline of the oil source to pass through and flow to the upper end surface of the third elastic member to form a first force.

[0013] According to some embodiments of the present invention, another part of the oil in the main oil supply pipeline of the above-mentioned oil source flows through the above-mentioned oil inlet hole to the bottom of the above-mentioned third valve core to form a second force. When the sum of the above-mentioned first force and the elastic force of the above-mentioned third elastic member is greater than the above-mentioned second force, the above-mentioned third valve core is located in the initial position, so that the fluid channel between the above-mentioned oil inlet hole and the above-mentioned oil outlet hole is cut off.

[0014] According to some embodiments of the present invention, the pilot oil circuit includes: a plurality of damping holes, which are suitable for reducing the pressure of the oil flowing through the pilot oil circuit.

[0015] According to an embodiment of the utility model, a hydraulic test system for rail vehicles, multiple hydraulic vibration table oil inlet pipelines are connected to the oil source. By arranging multiple pressure reducing valve block assemblies between the oil source and the oil inlet pipelines of the multiple hydraulic vibration tables, the multiple pressure reducing valve block assemblies are constructed to adjust the oil inlet pressure of the multiple hydraulic vibration tables according to the test loads of the multiple hydraulic vibration tables. When the hydraulic test system is in an extreme working condition or even out of control, the maximum output force of the actuators of the multiple hydraulic vibration tables can be controlled, thereby achieving a protective effect on the hydraulic vibration tables or test pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 is a block diagram of a hydraulic test system for a rail vehicle according to an illustrative embodiment of the present utility model;

[0018] Figure 2 is a perspective view of a pressure reducing valve block assembly according to an exemplary embodiment of the present invention;

[0019] Figure 3 This is an oil circuit diagram of the pressure reducing function of the pressure reducing valve block assembly according to an exemplary embodiment of the present utility model;

[0020] Figure 4 This is an oil circuit diagram of the cut-off function of a pressure reducing valve block assembly according to an illustrative embodiment of the present utility model.

[0021] In the drawings, the meanings of the reference numerals are as follows:

[0022] 100. Oil source;

[0023] 200. Hydraulic vibration table;

[0024] 300, pressure reducing valve block assembly;

[0025] 1. Solenoid reversing valve;

[0026] 11. Electromagnetic coil;

[0027] 12. First valve core;

[0028] 13. a first elastic member;

[0029] 2. Pressure control unit;

[0030] 21. Second valve core;

[0031] 22. second elastic member;

[0032] 3. Valve block body;

[0033] 31. The third valve core;

[0034] 32. a third elastic member;

[0035] 4. First damping hole;

[0036] 5. Second damping hole;

[0037] A1, oil inlet hole;

[0038] B1, oil outlet hole;

[0039] P, first import;

[0040] A2, first exit;

[0041] B2, second working position;

[0042] T, oil drain port;

[0043] A3, second import;

[0044] B3, third import;

[0045] N, Second Exit;

[0046] Z2, external oil storage equipment;

[0047] X. Pilot oil circuit. DETAILED DESCRIPTION

[0048] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion in the concepts of the present invention.

[0049] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the presence of the features, steps, operations and / or components, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[0050] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0051] When expressions such as "at least one of A, B, and C, etc." are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0052] In order to solve the problem that the hydraulic test system is in extreme working conditions or even out of control and the test piece is damaged due to excessive oil inlet pressure of the hydraulic vibration table, the oil inlet pipelines of multiple hydraulic vibration tables are connected to the oil source. By arranging multiple pressure reducing valve block assemblies between the oil source and the oil inlet pipelines of the multiple hydraulic vibration tables, the multiple pressure reducing valve block assemblies are constructed to adjust the oil inlet pressure of the multiple hydraulic vibration tables according to the test loads of the multiple hydraulic vibration tables. When the hydraulic test system is in extreme working conditions or even out of control, the maximum output force of the actuators of the multiple hydraulic vibration tables can be controlled, thereby achieving the protection of the hydraulic vibration table or the test piece.

[0053] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0054] Figure 1 It is a block diagram of a hydraulic test system for a rail vehicle according to an illustrative embodiment of the present utility model.

[0055] The embodiment of the present utility model provides a hydraulic test system for rail vehicles, such as Figure 1 As shown, the hydraulic testing system includes an oil source 100, multiple hydraulic vibration tables 200 suitable for performing hydraulic tests on rail vehicles, and multiple pressure reducing valve block assemblies 300. The oil inlet lines of the multiple hydraulic vibration tables 200 are connected to the oil source 100. The multiple pressure reducing valve block assemblies 300 are respectively disposed between the oil source 100 and the oil inlet lines of the multiple hydraulic vibration tables 200. The multiple pressure reducing valve block assemblies 300 are configured to adjust the oil inlet pressure of the multiple hydraulic vibration tables 200 according to the test load of the multiple hydraulic vibration tables 200, thereby controlling the maximum output force of the actuators of the multiple hydraulic vibration tables 200.

[0056] According to an embodiment of the present invention, a single oil source 100 simultaneously supplies oil to multiple hydraulic vibrating tables 200, with the oil supply pressure to each of the multiple hydraulic vibrating tables 200 being constant. Multiple pressure reducing valve block assemblies 300 are provided between the oil source 100 and the oil inlet lines of the multiple hydraulic vibrating tables 200, allowing the oil inlet pressures of the multiple hydraulic vibrating tables 200 to be adjusted individually according to the test loads of the multiple hydraulic vibrating tables 200. Due to the isolation provided by the pressure reducing valve block assemblies 300, the operating element of each hydraulic vibrating table is not affected by the operating elements of the other hydraulic vibrating tables. While meeting test parameters, this prevents the actuators of the multiple hydraulic vibrating tables 200 from exerting excessive force, which could damage the hydraulic vibrating tables 200 and the test piece.

[0057] Figure 2 It is a three-dimensional diagram of a pressure reducing valve block assembly 300 according to an exemplary embodiment of the present invention. Figure 31 is an oil circuit diagram of the pressure reducing function of the pressure reducing valve block assembly 300 according to an exemplary embodiment of the present invention.

[0058] According to the embodiment of the present utility model, Figure 2 and Figure 3 As shown, each pressure reducing valve block assembly 300 includes a valve block body 3 and an electromagnetic reversing mechanism. The valve block body 3 includes an oil inlet A1 and an oil outlet B1. The oil inlet A1 communicates with the main oil supply line of the oil source 100, while the oil outlet B1 communicates with the oil inlet line of the hydraulic vibration table 200. The electromagnetic reversing mechanism is mounted on the valve block body 3 and includes a pressure control unit 2. The pressure control unit 2 is configured to connect the fluid passage between the oil inlet A1 and the oil outlet B1 based on the pressure at the oil outlet B1 and to limit the pressure at the oil outlet B1 to a threshold pressure.

[0059] According to an embodiment of the present invention, the surface where the oil inlet hole A1 is located is perpendicular to the surface where the oil outlet hole B1 is located.

[0060] According to an embodiment of the present invention, the main oil supply pipeline of the oil source 100 is connected to the oil inlet A1 through a throttle hole.

[0061] According to an embodiment of the present invention, the exterior of the valve block body 3 is encapsulated with a plurality of cover plates.

[0062] According to an embodiment of the present utility model, the pressure control unit 2 connects the fluid channel between the oil inlet hole A1 and the oil outlet hole B1 according to the pressure of the oil outlet hole B1 and limits the pressure of the oil outlet hole B1 to not exceed the threshold pressure, thereby avoiding excessive output force of the actuators of multiple hydraulic vibration tables 200, thereby achieving a protective effect on the hydraulic vibration table 200 and the test piece.

[0063] According to the embodiment of the present utility model, Figure 2 and Figure 3 As shown, the electromagnetic reversing mechanism also includes an electromagnetic reversing valve 1, which includes a first inlet P, an electromagnetic coil 11, a first valve core 12 and a first elastic member 13. The first inlet P is configured to be connected to the oil inlet hole A1 through the oil pipeline. The electromagnetic coil 11 is configured to be energized to generate a magnetic field. One end of the first valve core 12 is connected to the electromagnetic coil 11, and the first valve core 12 is configured to be connected to the oil pipeline and the first outlet A2 connected to the pressure control unit 2 under the drive of the magnetic field. The first elastic member 13 is connected to the other end of the first valve core 12, and the first elastic member 13 is configured to drive the first valve core 12 to move when the electromagnetic coil 11 is de-energized to close the oil pipeline.

[0064] According to an embodiment of the present invention, the solenoid reversing valve 1 can be configured as a two-position, two-way valve. Driven by a magnetic field, the first valve core 12 connects the oil pipeline connected to the first inlet P and the first outlet A2 connected to the pressure control unit 2, indicating that the solenoid reversing valve 1 is in the first working position. When the electromagnetic coil 11 is de-energized, the first elastic member 13 drives the first valve core 12 to move, closing the oil pipeline. This places the solenoid reversing valve 1 in the second working position B2.

[0065] According to an embodiment of the present invention, the electromagnetic reversing valve 1 further includes an oil drain port T, through which the electromagnetic reversing valve 1 delivers oil to an external oil storage device Z2 (the external oil storage device Z2 is described in detail below).

[0066] According to an embodiment of the present invention, the electromagnetic coil 11 is controlled to be energized or de-energized to realize the connection or closure of the oil pipeline and the first outlet A2 connected to the pressure control unit 2. This automated control method has a fast response speed, convenient control and compact structure.

[0067] According to the embodiment of the present utility model, Figure 3 As shown, the pressure control unit 2 includes a second valve core 21, a second inlet A3, a second outlet N, a third inlet B3 and a second elastic member 22. The second inlet A3 is configured to communicate with the first outlet A2. The second outlet N is configured to communicate with the external oil storage device Z2. The third inlet B3 is configured to communicate with the oil outlet hole B1 so that a portion of the oil flowing out of the oil outlet hole B1 enters the pressure control unit 2, thereby pushing the second valve core 21 to move, wherein, when the pressure flowing out of the oil outlet hole B1 is greater than the threshold pressure of the pressure control unit 2, the second valve core 21 moves to open the second outlet N. The second elastic member 22 is connected to the second valve core 21, and the second elastic member 22 is configured to drive the second valve core 21 to move when the pressure flowing out of the oil outlet hole B1 is not greater than the threshold pressure of the pressure control unit 2, so that the second outlet N is closed.

[0068] In an illustrative embodiment, the pressure control unit 2 may be a stacked pressure reducing valve.

[0069] According to an embodiment of the present invention, a portion of the oil flowing out of the oil outlet hole B1 enters the pressure control unit 2, providing feedback control for the pressure control unit 2. When the pressure flowing out of the oil outlet hole B1 exceeds the threshold pressure of the pressure control unit 2, the second valve core 21 moves to open the second outlet N, thereby connecting the first outlet A2, the second inlet A3, the second outlet N, and the external oil reservoir Z2, thereby draining oil to the external oil reservoir Z2. When the pressure flowing out of the oil outlet hole B1 does not exceed the threshold pressure of the pressure control unit 2, the second valve core 21 is driven to move, closing the second outlet N and preventing oil from draining to the external oil reservoir Z2.

[0070] According to an embodiment of the present invention, the pressure control unit 2 further includes an adjustment screw. The adjustment screw is disposed on the second elastic member 22 and is configured to adjust the preload of the second elastic member 22 according to the test loads of the plurality of hydraulic vibration tables 200, so as to set the pressure control unit 2 to have different threshold pressures.

[0071] According to an embodiment of the present invention, when the pressure of the oil source 100 is relatively high and the test load of the hydraulic vibration table 200 does not require high-pressure operation, the preload force of the second elastic member 22 is adjusted according to the respective test loads of the multiple hydraulic vibration tables 200 to set the pressure control unit 2 to have different threshold pressures. This can prevent the output force of the actuators of the multiple hydraulic vibration tables 200 from being too large, thereby preventing damage to the hydraulic vibration tables 200 and the test piece.

[0072] According to the embodiment of the present utility model, Figure 3 As shown, the valve block body 3 includes a third valve core 31 and a third elastic member 32. The third valve core 31 is disposed in the fluid conduit between the oil inlet A1 and the oil outlet B1. The third elastic member 32 is connected to the third valve core 31. When the second outlet N is open, the third elastic member 32 is configured to use its elastic force to drive the third valve core 31 to move, thereby connecting the fluid passage between the oil inlet A1 and the oil outlet B1 and limiting the pressure in the oil outlet B1 to not exceed a threshold pressure.

[0073] According to an embodiment of the present invention, the third valve core 31 and the third elastic member 32 constitute a cartridge valve.

[0074] According to an embodiment of the present invention, when the pressure flowing out of oil outlet B1 exceeds the threshold pressure of pressure control unit 2, second valve core 21 moves to open second outlet N, thereby draining oil to external oil storage device Z2. After second outlet N opens and oil is drained, third elastic member 32 uses its elastic force to drive third valve core 31 to move, thereby connecting the fluid passage between oil inlet A1 and oil outlet B1 and limiting the pressure of oil outlet B1 to not exceed the threshold pressure. At this time, the pressure of oil outlet B1 remains at the threshold pressure. When the pressure flowing out of oil outlet B1 does not exceed the threshold pressure of pressure control unit 2, second valve core 21 moves to close second outlet N. With second outlet N closed, third elastic member 32 resets, thereby driving third valve core 31 to move. At this time, the pressure of oil outlet B1 is equal to the pressure of oil inlet A1.

[0075] According to an embodiment of the present utility model, the second valve core 21 of the pressure control unit 2 moves so that the second outlet N switches between opening and closing, so that the third elastic member 32 drives the third valve core 31 to switch between movement and reset, thereby maintaining the pressure of the oil outlet B1 not exceeding the threshold pressure.

[0076] According to an embodiment of the present utility model, when the pressure flowing out of the oil outlet B1 is greater than the threshold pressure of the pressure control unit 2, the upper end surface of the third elastic member 32 is connected to the external oil storage device Z2 through the electromagnetic reversing valve 1 and the pressure control unit 2 to form an oil leakage circuit to transport the oil on the upper end surface of the third elastic member 32 to the external oil storage device Z2.

[0077] According to an embodiment of the present utility model, when the pressure flowing out of the oil outlet hole B1 is greater than the threshold pressure of the pressure control unit 2, the upper end surface of the third elastic member 32 is connected to the external oil storage device Z2 through the first inlet P, the first outlet A2 and the second inlet A3 of the pressure control unit 2 of the electromagnetic reversing valve 1 and form an oil leakage circuit to transport the oil on the upper end surface of the third elastic member 32 to the external oil storage device Z2 until the pressure on the upper end surface of the third elastic member 32 is less than the pressure of the oil inlet hole A1. The third elastic member 32 uses elastic force to drive the third valve core 31 to move, so that the fluid channel between the oil inlet hole A1 and the oil outlet hole B1 is connected, thereby achieving pressure reduction.

[0078] Figure 4 1 is an oil circuit diagram of the cut-off function of the pressure reducing valve block assembly 300 according to an exemplary embodiment of the present invention.

[0079] According to the embodiment of the present utility model, Figure 4 As shown, the hydraulic test system further includes a pilot oil circuit X. One end of the pilot oil circuit X is connected to the oil inlet hole A1, and the other end of the pilot oil circuit X is connected to the upper end surface of the third elastic member 32. The pilot oil circuit X is configured to allow a portion of the oil in the main oil supply line of the oil source 100 to pass through and flow to the upper end surface of the third elastic member 32, thereby generating a first acting force.

[0080] According to an embodiment of the present utility model, when the electromagnetic coil 11 is de-energized, the oil delivery pipeline and the first outlet A2 connected to the pressure control unit 2 are closed, and a portion of the oil in the main oil supply pipeline of the oil source 100 passes through the pilot oil circuit X and flows to the upper end surface of the third elastic member 32 to form a first acting force. Due to its small flow rate, the pilot oil circuit X can quickly respond to changes in oil pressure, thereby ensuring the stability and responsiveness of the pressure reducing valve block assembly 300.

[0081] According to an embodiment of the present utility model, another part of the oil in the main oil supply pipeline of the oil source 100 flows through the oil inlet hole A1 to the bottom of the third valve core 31 to form a second force. When the sum of the first force and the elastic force of the third elastic member 32 is greater than the second force, the third valve core 31 is located in the initial position, so that the fluid channel between the oil inlet hole A1 and the oil outlet hole B1 is cut off.

[0082] According to an embodiment of the present utility model, when the sum of the first force and the elastic force of the third elastic member 32 is greater than the second force, the third valve core 31 is located in the initial position, that is, the position where the third elastic member 32 does not use the elastic force to drive the third valve core 31 to move, so that the fluid channel between the oil inlet hole A1 and the oil outlet hole B1 is cut off.

[0083] Therefore, the pressure reducing valve block assembly 300 according to the embodiment of the present utility model has three working states, namely: when the electromagnetic coil 11 is powered off, the fluid channel between the oil inlet hole A1 and the oil outlet hole B1 is cut off, that is, the cut-off state; when the electromagnetic coil 11 is powered on, the pressure flowing out of the oil outlet hole B1 is greater than the threshold pressure of the pressure control unit 2, the pressure of the oil outlet hole B1 is limited not to exceed the threshold pressure, that is, the pressure reducing state; and when the electromagnetic coil 11 is powered on, the pressure flowing out of the oil outlet hole B1 is not greater than the threshold pressure of the pressure control unit 2, the pressure of the oil outlet hole B1 is equal to the pressure of the oil inlet hole A1, that is, the equal pressure output state.

[0084] According to an embodiment of the present utility model, when an oil source 100 supplies oil to multiple hydraulic vibration tables 200 at the same time, by de-energizing the electromagnetic reversing valve 1 of the pressure reducing valve block assembly 300 of one branch, the high-pressure oil supplied to the hydraulic vibration table 200 of this branch can be cut off, so that the oil source 100 continues to supply oil to the hydraulic vibration tables 200 of other branches, and the hydraulic vibration table 200 corresponding to the branch where the electromagnetic reversing valve 1 of the pressure reducing valve block assembly 300 is de-energized can be disassembled and maintained.

[0085] According to an embodiment of the present invention, the pilot oil circuit X includes a plurality of damping holes, which are suitable for reducing the pressure of the oil flowing through the pilot oil circuit X.

[0086] According to an embodiment of the present utility model, the multiple damping holes include a first damping hole 4 and a second damping hole 5. When the electromagnetic reversing valve 1 is energized and the oil pipeline is connected to the first outlet A2 connected to the pressure control unit 2, the first damping hole 4 can reduce the sudden change of oil, make the oil flow more stable, and prevent the first valve core 12 from vibrating or becoming unstable due to rapid changes in oil pressure or oil flow.

[0087] According to an embodiment of the present utility model, when the electromagnetic reversing valve 1 is powered off and the oil pipeline and the first outlet A2 connected to the pressure control unit 2 are closed, a portion of the oil in the main oil supply pipeline of the oil source 100 passes through the pilot oil circuit X and flows to the upper end surface of the third elastic member 32. The second damping hole 5 can reduce the sudden change of the oil, make the oil flow more stable, and prevent the third valve core 31 from vibrating or becoming unstable due to rapid changes in oil pressure or oil flow.

[0088] It should be noted that the data processing system part in the embodiment of the present invention corresponds to the data processing method part in the embodiment of the present invention. The description of the data processing system part specifically refers to the data processing method part and will not be repeated here.

[0089] The above describes the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although each embodiment has been described separately, this does not mean that the measures in each embodiment cannot be advantageously used in combination. The present invention does not depart from the scope of the present invention, and those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A hydraulic test system for a rail vehicle, characterized in that: include: Oil source; A plurality of hydraulic vibration tables, wherein the oil inlet pipelines of the plurality of hydraulic vibration tables are all connected to the oil source; as well as Multiple pressure reducing valve block assemblies are respectively arranged between the oil source and the oil inlet pipelines of the multiple hydraulic vibration tables. The multiple pressure reducing valve block assemblies are configured to adjust the oil inlet pressures of the multiple hydraulic vibration tables according to the test loads of the multiple hydraulic vibration tables to control the maximum output forces of the actuators of the multiple hydraulic vibration tables.

2. The hydraulic test system according to claim 1, characterized in that: Each of the pressure reducing valve block assemblies comprises: a valve block body, comprising an oil inlet and an oil outlet, wherein the oil inlet is connected to a main oil supply line of the oil source, and the oil outlet is connected to an oil inlet line of the hydraulic vibration table; and An electromagnetic reversing mechanism is arranged on the valve block body, and the electromagnetic reversing mechanism includes a pressure control unit. The pressure control unit is configured to connect the fluid channel between the oil inlet hole and the oil outlet hole according to the pressure of the oil outlet hole and limit the pressure of the oil outlet hole to not exceed a threshold pressure.

3. The hydraulic test system according to claim 2, characterized in that: The electromagnetic reversing mechanism further comprises: Solenoid reversing valve, including: a first inlet, configured to communicate with the oil inlet hole through an oil pipeline; an electromagnetic coil configured to be energized to generate a magnetic field; a first valve core, one end of which is connected to the electromagnetic coil, and the first valve core is configured to connect the oil pipeline and a first outlet connected to the pressure control unit under the drive of the magnetic field; and The first elastic member is connected to the other end of the first valve core. The first elastic member is configured to drive the first valve core to move when the electromagnetic coil is powered off, so as to close the oil pipeline.

4. The hydraulic test system according to claim 3, characterized in that: The pressure control unit comprises: Second valve core; a second inlet configured to communicate with the first outlet; a second outlet configured to communicate with an external oil storage device; a third inlet configured to communicate with the oil outlet hole so that a portion of the oil flowing out of the oil outlet hole enters the pressure control unit, thereby pushing the second valve core to move, wherein when the pressure flowing out of the oil outlet hole is greater than a threshold pressure of the pressure control unit, the second valve core moves to open the second outlet; and The second elastic member is connected to the second valve core. The second elastic member is configured to drive the second valve core to move so that the second outlet is closed when the pressure flowing out of the oil outlet hole is not greater than the threshold pressure of the pressure control unit.

5. The hydraulic test system according to claim 4, characterized in that: The pressure control unit further comprises: An adjusting screw is provided on the second elastic member, and is configured to adjust the preload of the second elastic member according to a plurality of test loads of the hydraulic vibration tables, so as to set the pressure control unit to have different threshold pressures.

6. The hydraulic test system according to claim 4, characterized in that: The valve block body comprises: a third valve core, disposed in the fluid conduit between the oil inlet and the oil outlet; and a third elastic member connected to the third valve core, and configured to drive the third valve core to move by utilizing elastic force when the second outlet is opened, so as to connect the fluid passage between the oil inlet hole and the oil outlet hole and limit the pressure of the oil outlet hole to not exceed a threshold pressure.

7. The hydraulic test system according to claim 6, characterized in that: When the pressure flowing out of the oil outlet is greater than the threshold pressure of the pressure control unit, the upper end surface of the third elastic member is connected to the external oil storage device through the electromagnetic reversing valve and the pressure control unit to form an oil leakage circuit to transport the oil on the upper end surface of the third elastic member to the external oil storage device.

8. The hydraulic test system according to claim 6, characterized in that: Also includes: A pilot oil circuit, one end of which is connected to the oil inlet hole, and the other end of which is connected to the upper end surface of the third elastic member, wherein the pilot oil circuit is configured to allow a portion of the oil in the main oil supply pipeline of the oil source to pass through and flow to the upper end surface of the third elastic member to form a first force.

9. The hydraulic test system according to claim 8, characterized in that: Another part of the oil in the main oil supply pipeline of the oil source flows through the oil inlet hole to the bottom of the third valve core to form a second force. When the sum of the first force and the elastic force of the third elastic member is greater than the second force, the third valve core is located in the initial position, so that the fluid channel between the oil inlet hole and the oil outlet hole is cut off.

10. The hydraulic test system according to claim 8, characterized in that: The pilot oil circuit includes: A plurality of damping holes are adapted to reduce the pressure of the oil flowing through the pilot oil passage.

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