Testing device for pressure type water level display system of passenger train

Abstract

The utility model discloses a railway carriage pressure type water level display system test device comprising a box body, and a to-be-tested display instrument panel plug wire and a to-be-tested pressure sensor plug wire are arranged above the box body; a pressure pump and a pressure gauge are arranged on the upper surface of the box body; a power supply circuit is arranged in the box body, the input end of the power supply circuit is connected with AC 220V commercial power, and the output end is connected in parallel with a standard display instrument panel and a to-be-tested display instrument panel plug wire; a control panel for controlling circuit connection of the device is arranged on the upper surface of the box body, a standard display instrument panel and a standard pressure sensor are arranged above the box body, the standard display instrument panel is connected with the standard pressure sensor and a to-be-tested pressure sensor in a plug wire parallel mode, and the pressure end of the standard pressure sensor is communicated with the output end of a pressure pump. The to-be-tested display instrument panel plug wire is connected in parallel with the standard pressure sensor and the to-be-tested pressure sensor plug wire.

Description

Technical Field

[0001] The utility model relates to the technical field of water level display system testing, in particular to a test device for a pressure type water level display system of a railway passenger car. Background Art

[0002] Water level display systems are installed for different types of vehicles such as dining cars and power cars. The pressure water level meter is a device currently used in ordinary passenger cars and power-centralized EMUs to detect the water level in the car. The main components are pressure water level sensors, water level display panels, and intermediate connecting wires. It can monitor the water level changes in the car in real time and display the water level of the water tank on the water level display panel. When the train is running, it can provide the crew with relevant information on the water storage capacity of the car to ensure that passengers have comfortable riding conditions.

[0003] When the water level sensor or the water level display panel fails, the train crew will make incorrect judgments about the water level reserves in the vehicle, which will seriously affect the passengers' riding experience and even affect the safety of train operation. Therefore, according to the regulations of the China Railway Corporation, the water level display system must be tested and repaired when railway passenger vehicles enter the depot for maintenance.

[0004] At present, there is no corresponding test device, and the only way to take the current vehicle test is to add water and drain water. During the current vehicle test, the tap water in the water tank needs to be drained or filled up, and the water level on the water level display panel needs to be checked in sequence. Since the railway passenger car is not equipped with a quick drain valve, the drainage time is long (more than 1.5 hours), resulting in low efficiency in water level meter maintenance and testing. And the drained water cannot be recycled, resulting in waste of water resources and low test efficiency. When the water level display system fails, it is necessary to repeat the drainage test to find and confirm the fault point, which is a waste of resources. In the existing detection device of the water level display system, such as the Chinese utility model patent with patent number CN201520394514.X, a tester for detecting the filter water level sensor is disclosed. The tester connects the water level sensor to be tested to the USB interface on the tester through a USB test harness, displays the voltage, current value and test time through a voltage and current dual display meter and a timer, and detects different types of water level sensors by adjusting the dial switch and using different USB test harnesses. However, the device can only test the sensor, but not the water level display. If the water level display is to be tested, a test device for the display needs to be designed and manufactured separately. Moreover, the water level sensor and the water level display can only be tested separately, but not at the same time. Summary of the invention

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a test device for a pressure type water level display system of a railway passenger car.

[0006] The utility model is realized by the following technical solutions:

[0007] Railway passenger car pressure water level display system test device, including:

[0008] The box body 1 is provided with a display panel plug wire 11 to be tested and a pressure sensor plug wire 12 to be tested above the box body 1. The display panel plug wire 11 to be tested is used to connect the display panel 8 to be tested, and the pressure sensor plug wire 12 to be tested is used to connect the pressure sensor 9 to be tested;

[0009] A pressure pump 2 is arranged on the upper surface of the box body 1 and is used to provide a pressure source;

[0010] The pressure gauge 3 is arranged on the upper surface of the box body 1 and is connected to the output end of the pressure pump 2 to detect the pressure value output by the pressure pump 2;

[0011] The power supply circuit 4 is arranged in the box 1, the input end is connected to the AC220V mains, and the output end is connected in parallel to the standard display panel 6 and the display panel plug 11 to be tested, and is used to convert the 220V AC power into 48V DC power or 110V DC power;

[0012] A control panel 5 is provided on the upper surface of the housing 1 and is used to control the connection of the circuit of the device;

[0013] The standard display panel 6 is arranged above the box 1, connected in parallel with the standard pressure sensor 7 and the plug wire 12 of the pressure sensor to be tested, and is used to display the water level value corresponding to the pressure;

[0014] The standard pressure sensor 7 is arranged above the box 1, and the pressure end is connected to the output end of the pressure pump 2. The display panel plug 11 to be tested is connected in parallel with the standard pressure sensor 7 and the pressure sensor plug 12 to be tested.

[0015] Furthermore, the power supply circuit 4 includes a DC48V module 41 and a DC110V module 42 connected in parallel, and fuses are provided on the positive circuits of the input and output ends of the DC48V module 41 and the DC110V module 42.

[0016] Furthermore, the control panel 5 is provided with:

[0017] The conversion switch ZK1 is arranged on the parallel circuit of the standard display panel 6, the standard pressure sensor 7 and the plug wire 12 of the pressure sensor to be tested;

[0018] The conversion switch ZK2 is arranged on the parallel circuit of the display panel plug wire 11 to be tested, the standard pressure sensor 7 and the pressure sensor plug wire 12 to be tested;

[0019] The conversion switch ZK3 is arranged on the parallel circuit of the input ends of the DC48V module 41 and the DC110V module 42;

[0020] A power indicator light 51 is connected in parallel to the circuit at the input end of the power circuit 4;

[0021] The 48V indicator light 52 is connected in parallel to the circuit at the input end of the DC48V module 41;

[0022] The 110V indicator light 53 is connected in parallel to the circuit at the input end of the DC110V module 42.

[0023] Furthermore, the transfer switch ZK1, transfer switch ZK2 and transfer switch ZK3 are double-connected four-way transfer switches;

[0024] When the conversion switch ZK1 is placed on the left side, the standard display panel 6 is connected to the pressure sensor plug wire 12, and when the conversion switch ZK1 is placed on the right side, the standard display panel 6 is connected to the standard pressure sensor 7;

[0025] When the conversion switch ZK2 is placed on the left side, the panel plug 11 of the display instrument to be tested is connected to the plug 12 of the pressure sensor to be tested. When the conversion switch ZK2 is placed on the right side, the panel plug 11 of the display instrument to be tested is connected to the standard pressure sensor 7.

[0026] When the conversion switch ZK3 is placed on the left, the DC48V module 41 is turned on, and when the conversion switch ZK3 is placed on the right, the DC110V module 42 is turned on.

[0027] Furthermore, the box body 1 is provided with a pressure sensor seat 13 , and the pressure sensor seat 13 is provided with two slots, and the standard pressure sensor 7 and the pressure sensor to be tested 9 are placed in the two slots.

[0028] Furthermore, the pressure pump 2 is a hand-cranked micro-pressure power source.

[0029] The working principle of this utility model:

[0030] The utility model uses the air pressure generated by the pressure pump 2 to output pressure to the water level pressure sensors 7 and 9 instead of the water pressure. The standard pressure sensor 7 or the pressure sensor to be tested 9 converts the pressure signal into an electrical signal, and displays the water level through the standard display panel 6 or the display panel to be tested 8.

[0031] During the test, the pressure sensor 9 to be tested or the display panel 8 to be tested is replaced into the test device. The display panel 8 to be tested is plugged into the display panel plug wire 11, the pressure sensor 9 to be tested is placed in the pressure sensor seat 13, and the circuit end of the pressure sensor 9 to be tested is plugged into the pressure sensor plug wire 12 to be tested. Then, according to the model of the pressure sensor 9 to be tested or the display panel 8 to be tested, use the conversion switch ZK3 to select the DC48V module 41 or the DC110V module 42, and then connect the device to the AC220V power supply. The initial value of the standard display panel 6 is 0 water level. The tester turns the handle 21 of the pressure pump 2, and checks the changes in the liquid level on the standard display panel 6 and the display panel 8 to be tested according to the changes in the value of the pressure gauge 3, and judges whether the water level display panel 6, 8 or the pressure sensor 7, 9 is good or bad. Finally, when the water level is full, slowly shake the handle 21 of the pressure pump 2 in the opposite direction to return the pressure value to zero, and the liquid level is also returned to zero synchronously. During the process, the operator observes the pressure value displayed by the pressure gauge 3 and the liquid level value on the liquid level display panel in real time for synchronous comparison. If the full water level or 0 water level is always displayed during the process, it is judged that the pressure sensor is faulty; when it is found that the liquid level displays of the two display panels are inconsistent, it is concluded that the test panel is faulty.

[0032] Compared with the prior art, the utility model has the following beneficial effects:

[0033] The utility model can perform functional tests on pressure-type water level display panels 8 of different manufacturers and types equipped on current railway passenger cars by switching the switch control circuit, and can also meet the test needs of maintenance personnel for accessories.

[0034] The utility model adopts the method of ground tooling equipment testing, replaces water pressure with air pressure, meets the test requirements, and solves the problems of waste of water resources in loading tests and lack of unified test equipment.

[0035] The utility model tests the damaged water level sensor 7, 9 or the water level display panel 6, 8, which is convenient for the tester to make a fault diagnosis for the fault point appearing during the test. It can effectively reduce the time cost of repairing the water level sensor 7, 9 and the water level display panel 6, 8 of the railway passenger car and improve the repair efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0037] Figure 2 This is one of the usage state diagrams of the utility model;

[0038] Figure 3 This is the second usage state diagram of the utility model;

[0039] Figure 4 A circuit diagram of the utility model;

[0040] Figure 5 A circuit diagram of the power supply circuit of the utility model;

[0041] Figure 6 It is a schematic diagram of the connection between the display panel and the pressure sensor of the utility model.

[0042] Numbers in the figure:

[0043] 1- box body, 11- plug wire of the display panel to be tested, 12- plug wire of the pressure sensor to be tested, 13- pressure sensor seat;

[0044] 2-pressure pump, 21-handle;

[0045] 3- Pressure gauge;

[0046] 4-power supply circuit, 41-DC48V module, 42-DC110V module;

[0047] 5- control panel, 51- power indicator light, 52- 48V indicator light, 53- 110V indicator light;

[0048] 6-Standard display panel;

[0049] 7-Standard pressure sensor;

[0050] 8- Display panel to be tested;

[0051] 9-pressure sensor to be tested;

[0052] Changeover switch - ZK1, ZK2, ZK3. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solution of the utility model, its specific implementation method is described in detail below with reference to the accompanying drawings.

[0054] like Figure 1-6As shown, a test device for a pressure-type water level display system for a railway passenger car comprises a box body 1, on top of which a display panel plug 11 to be tested and a pressure sensor plug 12 to be tested are arranged; a pressure pump 2 and a pressure gauge 3 are arranged on the upper surface of the box body 1, and the pressure gauge 3 is connected to the output end of the pressure pump 2; a power supply circuit 4 is arranged in the box body 1, the input end of the power supply circuit 4 is connected to AC220V mains electricity, and the output end is connected in parallel with a standard display panel 6 and a display panel plug 11 to be tested; a control panel 5 for controlling the circuit connection of the device is arranged on the upper surface of the box body 1, and a standard display panel 6 and a standard pressure sensor 7 are arranged on the top of the box body 1, the standard display panel 6 is connected in parallel with the standard pressure sensor 7 and the pressure sensor plug 12 to be tested, the pressure end of the standard pressure sensor 7 is connected to the output end of the pressure pump 2, and the display panel plug 11 to be tested is connected in parallel with the standard pressure sensor 7 and the pressure sensor plug 12 to be tested.

[0055] In an embodiment, Figure 4 , 5 As shown, the power supply circuit 4 includes a DC48V module 41 and a DC110V module 42 connected in parallel, and fuses are provided on the positive circuits of the input and output ends of the DC48V module 41 and the DC110V module 42.

[0056] In an embodiment, Figure 1 , 2 As shown in FIG. 4 , the control panel 5 is provided with a conversion switch ZK1, a conversion switch ZK2, a conversion switch ZK3, a power indicator light 51, a 48V indicator light 52 and a 110V indicator light 53. The conversion switch ZK1, the conversion switch ZK2 and the conversion switch ZK3 are double-connected four-way conversion switches.

[0057] like Figure 6 As shown, the conversion switch ZK1 is set on the parallel circuit of the standard display panel 6, the standard pressure sensor 7, and the pressure sensor to be tested plug line 12. Among the four-way contacts at the conversion end of the conversion switch ZK1, the two left-side contacts are connected to the BP+ terminal and the 15V+ terminal of the pressure sensor to be tested 9, and the two right-side contacts are connected to the BP+ terminal and the 15V+ terminal of the standard pressure sensor 7; among the four-way contacts at the other end of the conversion switch ZK1, the two terminals corresponding to the BP+ poles of the two pressure sensors 7 and 9 are connected in parallel to the BP+ terminal of the standard display panel 6, and the two terminals corresponding to the 15V+ poles of the two pressure sensors 7 and 9 are connected in parallel to the 15V+ terminal of the standard display panel 6.

[0058] When the conversion switch ZK1 is placed on the left side, the standard display panel 6 is connected to the pressure sensor plug wire 12, and when the conversion switch ZK1 is placed on the right side, the standard display panel 6 is connected to the standard pressure sensor 7.

[0059] like Figure 6As shown, the conversion switch ZK2 is set on the parallel circuit of the display panel plug 11 to be tested and the standard pressure sensor 7 and the pressure sensor plug 12 to be tested. Among the four-way contacts at the conversion end of the conversion switch ZK2, the two left-side contacts are connected to the BP+ terminal and 15V+ terminal of the pressure sensor 9 to be tested, and the two right-side contacts are connected to the BP+ terminal and 15V+ terminal of the standard pressure sensor 7; among the four-way contacts at the other end of the conversion switch ZK2, the two terminals corresponding to the BP+ poles of the two pressure sensors 7 and 9 are connected in parallel to the BP+ terminal of the display panel 8 to be tested, and the two terminals corresponding to the 15V+ poles of the two pressure sensors 7 and 9 are connected in parallel to the 15V+ terminal of the display panel 8 to be tested.

[0060] When the conversion switch ZK2 is placed on the left side, the panel plug 11 of the display instrument to be tested is connected to the plug 12 of the pressure sensor to be tested. When the conversion switch ZK2 is placed on the right side, the panel plug 11 of the display instrument to be tested is connected to the standard pressure sensor 7.

[0061] like Figure 5 As shown, the conversion switch ZK3 is arranged on the parallel circuit of the DC48V module 41 and the DC110V module 42. Among the four contacts at the conversion end of the conversion switch ZK3, the two contacts on the left are respectively connected to the input end and the output end of the positive pole of the DC48V module 41, and the two contacts on the right are respectively connected to the input end and the output end of the positive pole of the DC110V module 42; among the four contacts at the other end of the conversion switch ZK3, the two terminals corresponding to the positive input ends of the DC48V module 41 and the DC110V module 42 are connected in parallel with the AC220V power supply, and the two terminals corresponding to the positive output ends of the DC48V module 41 and the DC110V module 42 are connected to the positive input terminals of the power supply of the standard display panel 6 and the display panel 8 to be tested.

[0062] When the conversion switch ZK3 is placed on the left, the DC48V module 41 is turned on, and when the conversion switch ZK3 is placed on the right, the DC110V module 42 is turned on.

[0063] A power indicator light 51 is connected in parallel to the circuit at the input end of the power circuit 4;

[0064] The 48V indicator light 52 is connected in parallel to the circuit at the input end of the DC48V module 41;

[0065] The 110V indicator light 53 is connected in parallel to the circuit at the input end of the DC110V module 42.

[0066] In the embodiment, a pressure sensor seat 13 is provided on the box body 1 , and two slots are provided on the pressure sensor seat 13 , and the standard pressure sensor 7 and the pressure sensor to be tested 9 are placed in the two slots.

[0067] Furthermore, the pressure pump 2 is a hand-cranked micro-pressure power source. Its main function is to replace water pressure with air pressure, adjust the pressure change by rotating the handle 21, and give different pressure values ​​to the pressure sensor. The pressure pump 2 is connected to the pressure gauge 3 and the pressure sensors 7 and 9 through a three-way pipeline.

[0068] Before using the equipment for testing, calibrate the water level meter device according to the following reference values.

[0069] The value of pressure gauge 3 is >1Kpa, and the water level display panel shows 1 / 4;

[0070] The value of pressure gauge 3 is >2Kpa, and the water level display panel shows 1 / 2;

[0071] The value of pressure gauge 3 is >3Kpa, and the water level display panel shows 3 / 4;

[0072] The value of pressure gauge 3 is >4Kpa, and the water level display panel shows 1 / 1.

[0073] Because there are many types of water level meters for railway passenger cars, their accuracy and proportional values ​​are also different. At the same time, the inspection of the water level meter on the current car is only for reference. Therefore, when the pressure value of the pressure gauge 3 rises or falls in proportion to the water level value on the water level meter display board, it is judged that the equipment is normal and the test can be carried out.

[0074] Working mode of the utility model:

[0075] Step 1: During the test, replace the pressure sensor 9 or the display panel 8 to be tested into the test device, and ensure that the test device must be of the same manufacturer and type. The display panel 8 to be tested is plugged into the display panel plug wire 11 to be tested, and the pressure sensor 9 to be tested is placed in the pressure sensor seat 13, and the circuit end of the pressure sensor 9 to be tested is plugged into the pressure sensor plug wire 12 to be tested.

[0076] Step 2: According to the model of the pressure sensor 9 to be tested or the display panel 8 to be tested, use the conversion switch ZK3 to select the DC48V module 41 or the DC110V module 42, and then connect the device to the AC220V power supply.

[0077] Step 3: The initial value of the standard display panel 6 is 0 water level. The tester turns the handle 21 of the pressure pump 2. At this time, the pressure value displayed by the pressure gauge 3 rises slowly and evenly, and the liquid level on the water level display panel rises synchronously. When the value of the pressure gauge 3 increases from 0 to 5Kp, the liquid level height of the display panel also rises from 0 water level to full water level. According to the change of the value of the pressure gauge 3, check the change of the liquid level on the standard display panel 6 and the display panel 8 to be tested, and judge whether the water level display panel 6, 8 or the pressure sensors 7, 9 are good or bad.

[0078] Step 4: Finally, when the water level is full, slowly shake the handle 21 of the pressure pump 2 in the opposite direction to return the pressure value to zero, and the liquid level is also returned to zero synchronously. During the process, the operator observes the pressure value displayed by the pressure gauge 3 and the liquid level value on the liquid level display panel in real time for synchronous comparison. If the full water level or 0 water level is always displayed during the process, it is judged that the pressure sensor is faulty; when the liquid level displays of the two display panels are inconsistent, it is concluded that the test panel is faulty.

[0079] 1. When the water level display and pressure sensor are tested simultaneously: take the DC48V water level meter as an example;

[0080] Connect the DC48V display panel 8 to the plug of the display panel plug wire 11 to be tested, connect the pressure sensor 9 to be tested to the plug of the pressure sensor plug wire 12 to be tested, turn the power conversion switch ZK3 to the left to DC48V, turn the conversion switch ZK2 to the left to connect with the standard pressure sensor 7, place the pressure sensor and the liquid level display panel in the specified position, and change the pressure value from 0 to 5kPa by turning the handle 21 of the pressure pump 2. The scale displayed on the water level meter panel changes from zero to full water level, thereby judging that the water level display and pressure sensor to be tested are good.

[0081] 2. When testing the water level display panel: take the DC110V power supply water level meter as an example;

[0082] Connect the DC110V display panel 8 to be tested with the plug of the display panel plug 11, turn the power switch ZK3 to the right to DC110V, turn the switch ZK2 to the left to connect with the standard pressure sensor 7, and turn the handle 21 of the pressure pump 2 to change the pressure value from 0 to 5kPa. The scale displayed on the water level meter panel changes from zero to full water level, so as to judge that the water level display to be tested is good. During the test, the standard display panel 6 is always compared with the display panel 8 to be tested. When it is found that the liquid level display of the two display panels is inconsistent, it is concluded that the display panel 8 to be tested has a fault.

[0083] 3. When testing the pressure sensor:

[0084] Connect the signal end of the pressure sensor 9 to be tested to the plug of the pressure sensor plug wire 12 to be tested, and connect the output end of the pressure pump 2 to the tail pressure sensing end of the pressure sensor 9 to be tested. After confirming that the connection is complete, select the power supply. After confirming that the power supply is properly plugged in, the AC220 power indicator 51 is on, turn the power conversion switch ZK3 to the DC48V module 41 or the DC110V module 42, turn the conversion switch ZK1 to the left to connect with the standard display panel 6, and turn the handle 21 of the pressure pump 2 to change the pressure value from 0 to 5kPa. The scale displayed on the standard display panel 6 changes from zero to full water level, so as to judge that the pressure sensor 9 to be tested is not damaged; if the full water level or 0 water level is displayed during the process, it is judged that the pressure sensor is faulty.

[0085] Note:

[0086] 1. Before use, make sure that the pressure sensors 7, 9 and the water level display panels 6, 8 are current type or voltage type.

[0087] 2. When the pressure sensors 7, 9 and the water level display panels 6, 8 are disconnected, the full water level should be displayed.

[0088] 3. When using, please note that the value of pressure gauge 3 changes linearly with the water level of the water level meter.

[0089] It should be noted that the above detailed introduction of the technical solution of the utility model and the description of the principle of the utility model are provided, and the above description of the working principle is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0090] The technical personnel in the technical field of the utility model can make modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, which shall fall within the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. Railway passenger car pressure water level display system test device, characterized in that: include: A box body (1), a display panel plug wire (11) to be tested and a pressure sensor plug wire (12) to be tested are arranged above the box body (1), the display panel plug wire (11) to be tested is used to connect to the display panel (8) to be tested, and the pressure sensor plug wire (12) to be tested is used to connect to the pressure sensor (9) to be tested; A pressure pump (2) is arranged on the upper surface of the box body (1) and is used to provide a pressure source; A pressure gauge (3) is arranged on the upper surface of the box body (1) and is connected to the output end of the pressure pump (2) and is used to detect the pressure value output by the pressure pump (2); The power supply circuit (4) is arranged in the box (1), the input end is connected to the AC220V mains, and the output end is connected in parallel to the standard display panel (6) and the display panel plug wire (11) to be tested, and is used to convert the 220V AC power into 48V DC power or 110V DC power; A control panel (5), arranged on the upper surface of the box (1), and used for controlling the connection of the circuit of the device; A standard display panel (6) is arranged above the box (1), connected in parallel with the standard pressure sensor (7) and the plug wire (12) of the pressure sensor to be tested, and is used to display the water level value corresponding to the pressure; The standard pressure sensor (7) is arranged above the box (1), and the pressure end is connected to the output end of the pressure pump (2). The display panel plug wire (11) to be tested is connected in parallel with the standard pressure sensor (7) and the pressure sensor plug wire (12) to be tested.

2. The railway passenger car pressure water level display system test device according to claim 1, characterized in that: The power supply circuit (4) comprises a DC48V module (41) and a DC110V module (42) connected in parallel, and fuses are provided on the positive circuits at the input and output ends of the DC48V module (41) and the DC110V module (42).

3. The railway passenger car pressure water level display system test device according to claim 2 is characterized in that: The control panel (5) is provided with: The conversion switch ZK1 is arranged on a parallel circuit of a standard display panel (6), a standard pressure sensor (7), and a plug wire (12) of a pressure sensor to be tested; The conversion switch ZK2 is arranged on a parallel circuit of a display panel plug wire (11) to be tested, a standard pressure sensor (7) and a pressure sensor plug wire (12) to be tested; A conversion switch ZK3 is arranged on a parallel circuit between the input ends of the DC48V module (41) and the DC110V module (42); A power indicator light (51) is connected in parallel to the circuit at the input end of the power circuit (4); A 48V indicator light (52) is connected in parallel to the circuit at the input end of the DC48V module (41); The 110V indicator light (53) is connected in parallel to the circuit at the input end of the DC110V module (42).

4. The railway passenger car pressure water level display system test device according to claim 3 is characterized in that: The transfer switch ZK1, transfer switch ZK2 and transfer switch ZK3 are double-connected four-way transfer switches; When the conversion switch ZK1 is placed on the left side, the standard display panel (6) is connected to the plug wire (12) of the pressure sensor to be tested; when the conversion switch ZK1 is placed on the right side, the standard display panel (6) is connected to the standard pressure sensor (7); When the conversion switch ZK2 is placed on the left side, the panel plug wire (11) of the display instrument to be tested is connected to the plug wire (12) of the pressure sensor to be tested; when the conversion switch ZK2 is placed on the right side, the panel plug wire (11) of the display instrument to be tested is connected to the standard pressure sensor (7); When the conversion switch ZK3 is placed on the left side, the DC48V module (41) is turned on, and when the conversion switch ZK3 is placed on the right side, the DC110V module (42) is turned on.

5. The railway passenger car pressure water level display system test device according to claim 1, characterized in that: The box body (1) is provided with a pressure sensor seat (13), and the pressure sensor seat (13) is provided with two card slots, and the standard pressure sensor (7) and the pressure sensor to be tested (9) are placed in the two card slots.

6. The railway passenger car pressure water level display system test device according to claim 1, characterized in that: The pressure pump (2) is a hand-cranked micro-pressure power source.

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