A detection device for individual modules of a locomotive air line system

Abstract

This invention relates to a testing device for individual modules of a locomotive air piping system, comprising a cabinet, a pressure testing mechanism and an electrical testing mechanism disposed inside the cabinet, and a test bench disposed outside the cabinet for placing the module under test. The pressure testing mechanism includes an air supply pipeline and multiple testing pipelines, and is used to perform airtightness testing on the module under test. The electrical testing mechanism includes a control unit and a drive unit, and is used to perform electrical logic testing on the module under test. An industrial control computer is connected to the electrical testing mechanism and the pressure testing mechanism, and the industrial control computer is used to generate and edit testing instructions. This invention can adapt to various independent module models, performing automatic testing on their airtightness, circuit and air circuit logic, pressure switches, and electric gates, and can also perform manual testing.

Description

Technical Field

[0001] This invention relates to the field of testing air piping systems for locomotives and rolling stock, and more particularly to a testing device for individual modules of a locomotive air piping system. Background Technology

[0002] The independent modules of the air piping system in locomotives and rolling stock are air piping systems that integrate components such as electro-pneumatic valves, pressure switches, and electric stop valves onto the air circuit board to achieve various functions (such as sand-spraying). The internal piping routing and logic are not visually apparent. After each independent module is assembled, its electrical logic and airtightness must be tested to verify its performance and ability to fulfill its designed functions. Currently, most independent module test benches are designed for specific models, with limited functionality. They can only test specific models of independent modules and cannot accommodate multiple models. Furthermore, newly developed independent modules require entirely new test benches.

[0003] For example, the airtightness testing device for an electro-pneumatic valve disclosed in patent publication number CN201910912004.X, entitled "An Electro-pneumatic Valve Testing Device", cannot meet the airtightness and circuit logic testing of the assembled independent modules. Taking the above-disclosed device as an example, the testing devices of individual components are applied sequentially to the testing of multiple indicators of the independent modules, which cannot simulate the actual working state of the independent modules. The testing devices are relatively discrete and cannot work together, resulting in the test data not being authentic. Summary of the Invention

[0004] This invention addresses the challenges of testing the electrical logic and airtightness of independent modules in locomotives. It provides a testing device for each independent module of a locomotive's air piping system, capable of accommodating various module models. The device automatically tests the airtightness, circuit and air circuit logic, pressure switches, and electric gates, while also enabling manual testing. The testing program is flexible and open, allowing users to edit the test programs and content according to different module models, enabling testing of opposing modules from different and newly developed models.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A testing device for each independent module of a locomotive air piping system includes a cabinet, a pressure testing mechanism and an electrical testing mechanism disposed inside the cabinet, and a test bench disposed outside the cabinet for placing the module under test. The pressure testing mechanism includes an air supply pipeline and multiple testing pipelines, and the pressure testing mechanism is used to perform air tightness testing on the module under test.

[0007] The electrical testing mechanism includes a control unit and a drive unit. The electrical testing mechanism is used to perform electrical logic testing on the module under test. The electrical testing mechanism is connected to the pressure testing mechanism by an industrial control computer, which is used to construct and edit testing instructions.

[0008] Furthermore, the air supply pipeline includes a main air cylinder, a proportional regulating valve, a first two-position two-way valve, a second two-position two-way valve, a secondary air cylinder, and a first pressure sensor. The air outlet of the main air cylinder is connected to the second two-position two-way valve via the proportional regulating valve and the first two-position two-way valve, and the air outlet of the second two-position two-way valve is connected to the secondary air cylinder.

[0009] Furthermore, the plurality of detection pipelines include a third two-way valve and a fourth two-way valve, a second pressure sensor and a pressure-holding air cylinder. The outlet of the secondary air cylinder is connected to the third two-way valve, and the outlet of the third two-way valve is connected to the pressure-holding air cylinder and the fourth two-way valve respectively. A second pressure sensor is provided between the pressure-holding air cylinder and the third two-way valve. A silencer is connected to the outlet of the fourth two-way valve. The first pressure sensor and the second pressure sensor are connected to a data acquisition card.

[0010] Furthermore, the control unit includes a lower-level machine, which is connected to the industrial control computer via a communication unit. The communication unit includes an RS232 serial port, and the lower-level machine is connected to multiple relays. The lower-level machine is connected to the pressure detection mechanism through the relays.

[0011] Furthermore, the driving unit includes multiple optocoupler relays, the coils of which are connected to the lower-level machine's I / O port. The optocoupler relays are grouped into sets of five, and are used to drive the tested module to power on.

[0012] Furthermore, the cabinet side panel has a cable outlet and multiple air vents. The drive unit cable is connected to the test bench through the cable outlet. The test bench is a hollow rectangular plate. The side wall of the test bench has multiple air inlets corresponding to the air outlet of the cabinet. The air outlet and air inlets are connected by pressure hoses. Multiple air ducts are set inside the test bench corresponding to the number of air inlets. Multiple fixing holes are opened on the upper surface of the test bench. Threads are opened in the fixing holes. The test bench and the module under test are fixedly connected by threads.

[0013] The beneficial effects of this invention are:

[0014] 1. This invention includes a pressure testing mechanism and an electrical testing mechanism, as well as a test bench located outside the cabinet for placing the module under test. The pressure testing mechanism includes an air supply pipeline and multiple testing pipelines, and is used to perform airtightness testing on the module under test. The electrical testing mechanism includes a control unit and a drive unit, and is used to perform electrical logic testing on the module under test. An industrial control computer is connected to the electrical testing mechanism and the pressure testing mechanism, and the industrial control computer is used to construct and edit testing instructions.

[0015] During use, the pressure detection mechanism is started sequentially by an industrial control computer. The program written in the industrial control computer performs airtightness testing on the module under test through the sensors in the detection pipeline. Combined with the control unit, the air inlet and outlet of the detection pipeline are switched. When the output is an air inlet, it is connected to the module under test as the air source for the module. When it is an outlet, it is connected to the module under test as the air source and returns air to the test bench through the internal pipeline of the module. The industrial control computer program is flexible and can perform airtightness testing on each component in the module under test.

[0016] At the same time, the industrial control computer controls the electrical testing mechanism. The drive unit is connected to each component in the module under test through cables via relays or solenoid valves. The industrial control computer makes each contact of the module under test simulate the actual operating conditions and perform sequential actions according to the program settings, thereby judging whether the triggering logic of each contact is accurate. Attached Figure Description

[0017] Figure 1 This is one of the structural schematic diagrams of a detection device for each independent module of a locomotive air piping system according to the present invention.

[0018] Figure 2 This is the second schematic diagram of the structure of the detection device for each independent module of the locomotive air piping system of the present invention.

[0019] Figure 3 This is the third schematic diagram of the structure of the detection device for each independent module of the locomotive air piping system of the present invention.

[0020] Figure 4 This is a schematic diagram of the test bench structure for a testing device for each independent module of a locomotive air piping system according to the present invention.

[0021] Figure 5 This is a schematic diagram of the air circuit of the pressure detection mechanism of the detection device for each independent module of the locomotive air pipeline system of the present invention.

[0022] Figure 6 This is a system detection principle diagram of a detection device for each independent module of a locomotive air piping system according to the present invention.

[0023] The attached diagram is labeled as follows: 1 is the cabinet, 2 is the test bench, 3 is the industrial computer, 4 is the main air cylinder, 5 is the proportional regulating valve, 6 is the third two-position two-way valve, 7 is the first two-position two-way valve, 8 is the second two-position two-way valve, 9 is the secondary air cylinder, 10 is the first pressure sensor, 11 is the fourth two-position two-way valve, 12 is the second pressure sensor, 13 is the pressure-holding air cylinder, 14 is the lower-level machine, 15 is the relay, and 16 is the optocoupler relay. Detailed Implementation

[0024] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0025] like Figures 1-6 As shown, a testing device for each independent module of a locomotive air piping system includes a cabinet 1, a pressure testing mechanism and an electrical testing mechanism disposed inside the cabinet 1, and a test bench 2 disposed outside the cabinet 1 for placing the module under test. The pressure testing mechanism includes an air supply pipeline and multiple testing pipelines, and the pressure testing mechanism is used to test the air tightness of the module under test.

[0026] The electrical testing mechanism includes a control unit and a drive unit. The electrical testing mechanism is used to perform electrical logic testing on the module under test. The electrical testing mechanism is connected to the pressure testing mechanism by an industrial control computer 3, which is used to construct and edit testing instructions.

[0027] To optimize the product structure, the air supply pipeline includes a main air cylinder 4, a proportional regulating valve 5, a first two-position two-way valve 7, a second two-position two-way valve 8, a secondary air cylinder 9, and a first pressure sensor 10. The air outlet of the main air cylinder 4 is connected to the second two-position two-way valve 8 via the proportional regulating valve 5 and the first two-position two-way valve 7. The air outlet of the second two-position two-way valve 8 is connected to the secondary air cylinder 9.

[0028] To enable the detection pipelines to construct corresponding air paths with independent module components, multiple detection pipelines include a third two-position two-way valve 18 and a fourth two-position two-way valve 11, a second pressure sensor 12, and a pressure-holding air cylinder 13. The air outlet of the secondary air cylinder 9 is connected to the third two-position two-way valve 18. The air outlet of the third two-position two-way valve 18 is connected to the pressure-holding air cylinder 13 and the fourth two-position two-way valve 11 respectively. The second pressure sensor 12 is installed between the pressure-holding air cylinder 13 and the third two-position two-way valve 18. The air outlet of the fourth two-position two-way valve 11 is connected to a silencer. The first pressure sensor 10 and the second pressure sensor 12 are connected to a data acquisition card.

[0029] In this embodiment, the number of detection pipelines is 6. The air outlet and air return port can be defined according to actual needs. The module under test is connected to the 6 detection pipelines through quick connectors and flexible hoses. The quick connectors at the module connection end are designed with different specifications of G1 / 4, G3 / 8, G1 / 2, and G1 to meet the connection of different interface diameters of the module. The data acquisition card model is PCI-1710, and the sampling frequency of the acquisition card is 100KHz.

[0030] To enable electrical logic testing and debugging of the module under test, the control unit includes a lower-level machine 14. The lower-level machine 14 is connected to the industrial control computer 3 via a communication unit, which includes an RS232 serial port. The lower-level machine 14 is connected to multiple relays 15, and the lower-level machine is connected to the pressure detection mechanism through the relays 15. The drive unit includes multiple optocoupler relays 16, and the coils of the optocoupler relays 16 are connected to the I / O ports of the lower-level machine 14. The optocoupler relays 16 are grouped in sets of five, and the optocoupler relays 16 are used to drive the module under test to power on.

[0031] In this example, there are 185 optocoupler relays 16. By combining them, 37 freely definable pins can be output. Each pin can be freely defined as: 110V (74)+, 110V (74)-, 24V+, 24V-, as a switching quantity detection signal.

[0032] To facilitate the testing of the module under test, the side panel of the cabinet 1 is provided with a cable outlet and multiple air vents. The cable from the drive unit is connected to the test bench 2 through the cable outlet. The test bench 2 is a hollow rectangular plate. The side wall of the test bench 2 is provided with multiple air inlets corresponding to the air outlet of the cabinet 1. The air outlet and air inlets are connected by pressure hoses. Multiple air ducts are provided inside the test bench 2 corresponding to the number of air inlets. Multiple fixing holes are provided on the upper surface of the test bench 2. Threads are provided in the fixing holes. The test bench 2 and the module under test are fixedly connected by threads.

[0033] 1. Air tightness test of the module under test:

[0034] The industrial control computer controls the corresponding solenoid valves of the test bench to make the test pipelines "pipe 1-pipe 6" either air inlets or outlets. The signal control terminal of the 37-core connecting wire of the drive circuit is connected to the corresponding solenoid valve on the module under test. After the air cylinder pressure stabilizes, the solenoid valves of each test pipeline are closed, and the initial pressure of the air cylinder is recorded. After a specified time (which can be set by the user, such as 10 minutes), the pressure of each air cylinder is collected and compared with the initial pressure to give the air tightness performance at the corresponding position.

[0035] 2. Pressure switch test:

[0036] by Figure 4Taking the test pipeline as an example, the air source is supplied through the main air cylinder 4, then through the proportional regulating valve 5 (labeled CA2 in the figure) to the secondary air cylinder 9, and finally into the pressure holding air cylinder 13 to supply air to the test bench 2. The industrial control computer 3 controls the lower computer 14 and the solenoid valve corresponding to the module under test, so that the branch (test pipeline) connected upstream of the pressure switch in the test bench 2 and the module under test becomes the air inlet, and the branch downstream of the pressure switch (air duct of test bench 2) is closed. The industrial control computer 3 adjusts the proportional coefficient C2 to keep the air pressure below the specified action value of the pressure switch, and then gradually increases the pressure. At the same time, the pressure value is monitored by the second pressure sensor 12 (labeled CA1 in the figure), and the data acquisition card detects the change of the pressure switch contact. When the pressure switch is activated, the pressure value at this moment is transmitted to the industrial control computer 3. This action value is the pressure switch's upward action value. The industrial control computer 3 compares the action pressure value with the program setting value to determine the pressure switch detection parameters.

[0037] After the pressure switch is activated, the pressure of the pressure-holding air cylinder 13 is reduced by adjusting C2 until the pressure switch is reset, and the value of the pressure switch reduction action is measured.

[0038] 3. Electric plug door test:

[0039] An electric stop valve is a combination of valves with attached electrical contacts that open or close when the valve handle is turned by hand.

[0040] During testing, the lower-level machine 14 is controlled by the program set in the industrial control computer 3. The 37-core connecting wire of the drive circuit is connected to the electric contact of the electric plug door. It operates according to normal operation, detects the change of the switch signal, and judges whether the logic is accurate.

[0041] The testing process is as follows:

[0042] The first step involves engineers setting up a program on the industrial control computer 3, editing and defining the signals for the inlet and outlet ports of the six detection pipelines and the 37 output pins of the drive circuit, and editing the test conditions and judgment criteria for each step, so that the test program can be called during automatic testing. The definitions of the air circuits and electrical pins can be freely defined according to the model of the independent module, meeting the test requirements of different models and newly developed models of independent modules.

[0043] The second step is to connect the program-defined test pipeline interface and the 16-pin optocoupler relay to the module under test via a pressure hose and a 37-core connecting wire. Enter the automatic test program, configure the test program for the corresponding model, start the automatic test, and automatically perform the test according to the test steps edited in the first step, and output the corresponding test report.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A detection device for each independent module of a locomotive air piping system, characterized in that, It includes a cabinet (1), a pressure testing mechanism and an electrical testing mechanism installed inside the cabinet (1), and a test bench (2) installed outside the cabinet (1) for placing the module under test. The pressure testing mechanism includes an air supply pipeline and multiple testing pipelines. The pressure testing mechanism is used to test the air tightness of the module under test. The electrical testing mechanism includes a control unit and a drive unit. The electrical testing mechanism is used to perform electrical logic testing on the module under test. The electrical testing mechanism is connected to the pressure testing mechanism by an industrial control computer (3). The industrial control computer (3) is used to construct and edit testing instructions. The air supply pipeline includes a main air cylinder (4), a proportional regulating valve (5), a first two-position two-way valve (7), a second two-position two-way valve (8), a secondary air cylinder (9), and a first pressure sensor (10). The multiple detection pipelines include a third two-way valve (6) and a fourth two-way valve (11), a second pressure sensor (12) and a pressure-holding cylinder (13). The outlet of the secondary cylinder (9) is connected to the third two-way valve (6). The outlet of the third two-way valve (6) is connected to the pressure-holding cylinder (13) and the fourth two-way valve (11) respectively. A second pressure sensor (12) is provided between the pressure-holding cylinder (13) and the third two-way valve (6). A silencer is connected to the outlet of the fourth two-way valve (11). A data acquisition card is connected to the first pressure sensor (10) and the second pressure sensor (12). The control unit includes a lower-level machine (14), and the lower-level machine (14) is connected to the industrial control computer (3) by a communication unit. The communication unit includes an RS232 serial port. The lower-level machine (14) is connected to multiple relays (15), and the lower-level machine is connected to the pressure detection mechanism through the relays (15). The driving unit includes multiple optocoupler relays (16). The coils of the optocoupler relays (16) are connected to the I / O ports of the lower-level machine (14). The optocoupler relays (16) are grouped into sets of five. The optocoupler relays (16) are used to drive the module under test to power on.

2. The detection device for each independent module of a locomotive air piping system according to claim 1, characterized in that, The main air cylinder (4) outlet is connected to the second two-position two-way valve (8) via the proportional regulating valve (5) and the first two-position two-way valve (7), and the outlet of the second two-position two-way valve (8) is connected to the secondary air cylinder (9). The cabinet (1) has a cable outlet and multiple air holes on its side panel. The cable outlet of the drive unit is connected to the test bench (2) through the cable outlet. The test bench (2) is a rectangular plate with a hollow interior. The side wall of the test bench (2) has multiple air inlets corresponding to the air outlet of the cabinet (1). The air outlet and the air inlets are connected by a pressure hose.

3. The detection device for each independent module of a locomotive air piping system according to claim 1, characterized in that, The test bench (2) has multiple air ducts inside corresponding to the number of air inlets. Multiple fixing holes are opened on the upper surface of the test bench (2). Threads are opened in the fixing holes. The test bench (2) and the module under test are fixedly connected by threads.

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