On-line detection device for railway freight car air pressure test equipment

Abstract

The utility model relates to railway freight car air pressure test equipment's on -line detection device relates to railway freight car air pressure test equipment inspection technical field, especially railway freight car air pressure test equipment's on -line detection device. Including railway freight car brake valve kind test board and reference pressure gauge, be provided with main air pipe line and branch pipe in the box of railway freight car brake valve kind test board, the upper end of railway freight car brake valve kind test board is provided with the pressure gauge of to be detected, one end of main air pipe line of railway freight car brake valve kind test board is connected pressure gauge of to be detected through branch pipe, the other end of main air pipe line is connected air compressor through explosion -proof air pipe, the air outlet of air compressor is provided with tee pipe, the upper end of tee pipe is connected reference pressure gauge, the other end of tee pipe is connected explosion -proof air pipe, the utility model need not to dismount pressure gauge, has the positive effect of improving calibration efficiency, reducing spare parts cost, guaranteeing the accuracy and reliability of calibration result simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of inspection technology for railway freight car wind pressure testing equipment, and in particular to an online testing device for railway freight car wind pressure testing equipment. Background Technology

[0002] According to relevant regulations and rules such as JJG52-2013 Verification Procedure for Elastic Element Type General Pressure Gauges, Pressure Vacuum Gauges and Vacuum Gauges, JJG882-2019 Verification Procedure for Pressure Transmitters, and TG / CL 225 Maintenance Rules for Railway Freight Car Braking Devices, pressure calibration and testing are required for railway freight car brake valve test benches and centralized control air testing systems. Currently, pressure gauges, pressure transmitters, and other measuring instruments used in railway freight car brake valve test benches and centralized control air testing systems need to be periodically disassembled and sent to the laboratory for pressure calibration and testing. This pressure calibration and testing method not only involves a large amount of disassembly and assembly work, affecting production efficiency, but also requires a large number of spare parts, resulting in high costs. Furthermore, only one pressure gauge can be tested at a time, and single-item calibration cannot guarantee overall error control when multiple instruments are used together. Utility Model Content

[0003] The purpose of this utility model is to provide an online testing device for railway freight car wind pressure testing equipment, so as to achieve the goal of eliminating the need to disassemble the pressure gauge, improving calibration efficiency, reducing spare parts costs, and ensuring the accuracy and reliability of calibration results.

[0004] The online testing device for railway freight car air pressure testing equipment provided by this utility model includes a railway freight car brake valve test bench and a reference pressure gauge. The test bench is equipped with a main air duct and branch air ducts. The pressure gauge to be tested is installed at the upper end of the test bench. One end of the main air duct is connected to the pressure gauge to be tested through a branch air duct, and the other end of the main air duct is connected to an air compressor through an explosion-proof air pipe. The air compressor has a T-junction at its outlet port. The upper end of the T-junction is connected to the reference pressure gauge, and the other end of the T-junction is connected to the explosion-proof air pipe.

[0005] Furthermore, one end of the explosion-proof air pipe is connected to a tee pipe via a quick-connect plug, and the other end of the explosion-proof air pipe is connected to the main air duct of a railway freight car brake valve test bench or a centralized control air test system via a tee pipe.

[0006] Furthermore, the air compressor is a box-type oil-free air compressor with a pressure output range of 0–1.0 MPa and an accuracy class of not less than 0.02. Furthermore, the air compressor is provided with a handle at the top and adjustable support legs at the bottom.

[0007] Furthermore, the air compressor is provided with an air outlet port and a backup port at the front end, and the air outlet port and the backup port are arranged side by side.

[0008] Furthermore, both the outlet port and the backup port are equipped with a switch valve, and a start switch is provided on the side of the backup port.

[0009] Furthermore, a main air switch is installed on the main air duct, and branch air switches are installed on the branch ducts.

[0010] The online testing device for railway freight car wind pressure testing equipment provided by this utility model has the following beneficial effects: 1. This utility model connects an air compressor to the main air duct of a railway freight car brake valve test bench via an explosion-proof air pipe. When the air compressor is started, it connects to the pressure gauges to be tested, reads the pressure values ​​of multiple pressure gauges, and compares them with the pressure values ​​on the reference pressure gauge. This allows for the simultaneous testing of multiple pressure gauges, ensuring the accuracy and reliability of the calibration results.

[0011] 2. This utility model allows for online calibration of the pressure gauge without disassembling it, which not only significantly reduces the workload of disassembling and assembling the pressure gauge, but also reduces spare parts inventory and lowers equipment maintenance costs.

[0012] 3. This utility model provides more accurate overall calibration, avoids errors caused by the coordination of multiple instruments, and has higher calibration efficiency.

[0013] Therefore, this invention eliminates the need to disassemble the pressure gauge, thus improving calibration efficiency, reducing spare parts costs, and ensuring the accuracy and reliability of calibration results. Attached Figure Description

[0014] The accompanying drawings disclose specific embodiments of this utility model, wherein, Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram of the air compressor of this utility model; Figure 3 This is a schematic diagram of the air pressure structure of the railway freight car brake valve test bench of this utility model; Figure label: 1. Air compressor; 11. T-joint; 12. Adjustable support leg; 13. Handle; 14. Spare port; 15. Switch valve; 16. Start switch; 2. Reference pressure gauge; 3. Explosion-proof gas pipe; 4. Railway freight car brake valve test bench; 41. Main air duct; 42. Branch air duct; 43. Main air switch; 44. Branch air switch; 5. Pressure gauge to be tested. Detailed Implementation

[0015] like Figure 1-3 As shown, the online testing device for railway freight car air pressure testing equipment provided by this utility model includes a railway freight car brake valve test bench 4 and a reference pressure gauge 2. The test bench 4 is equipped with a main air duct 41 and a branch air duct 42. The upper end of the test bench 4 is equipped with a pressure gauge 5 to be tested. One end of the main air duct 41 of the test bench 4 is connected to the pressure gauge 5 to be tested through the branch air duct 42, and the other end of the main air duct 41 is connected to an air compressor through an explosion-proof air pipe 3. The air compressor 1 is equipped with a three-way pipe 11 at its outlet port. The upper end of the three-way pipe 11 is connected to the reference pressure gauge 2, and the other end of the three-way pipe 11 is connected to the explosion-proof air pipe 3.

[0016] In use, this invention involves first connecting an air compressor 1 to the main air duct 41 of a railway freight car brake valve test bench 4 via an explosion-proof air pipe 3. Then, an external power supply is connected, and the air compressor 1 is started. The air compressor 1 connects to the pressure gauge 5 to be tested via the main air duct 41 and branch pipes 42, and maintains pressure for 3 minutes. The pressure drop in the last minute should not exceed 1 kPa. Finally, the pressure values ​​on multiple test pressure gauges 5 and the reference pressure gauge 2 are read. The pressure values ​​of the multiple test pressure gauges 5 are compared with the pressure value on the reference pressure gauge 2 to check whether the pressure values ​​of the multiple test pressure gauges 5 are within the allowable error range. This process eliminates the need to disassemble the test pressure gauges 5 and allows for simultaneous testing of multiple test pressure gauges 5, ensuring the accuracy and reliability of the calibration results.

[0017] like Figure 1-3 As shown, one end of the explosion-proof air pipe 3 is connected to the tee pipe 11 via a quick-connect plug, and the other end of the explosion-proof air pipe 3 is connected to the main air duct of the railway freight car brake valve test bench 4 or the centralized control air test system equipment via a tee. The online testing device for railway freight car air pressure testing equipment provided by this utility model is not only suitable for the calibration and testing of pressure gauges on the railway freight car brake valve test bench 4, the centralized control air test system equipment, the railway freight car loaded test bench, and the railway freight car 120 valve test bench, but also suitable for the calibration and testing of pressure gauges in the railway freight car centralized control air test system. One end of the explosion-proof air pipe 3 can be quickly connected to the outlet port of the air compressor 1, and the other end of the explosion-proof air pipe 3 can be quickly connected to the main air duct of the railway freight car brake valve test bench 4, the centralized control air test system equipment, the railway freight car loaded test bench, the railway freight car 120 valve test bench, and the railway freight car centralized control air test system for pressure gauge calibration and testing.

[0018] like Figure 1-2 As shown, the air compressor 1 is equipped with a handle 13 at its upper end and adjustable support legs 12 at its bottom. The handle 13 facilitates the movement of the air compressor 1, and the adjustable support legs 12 can be used to adjust the height of the air compressor 1 according to the site of use, thereby improving calibration efficiency.

[0019] like Figure 1-2 As shown, the air compressor 1 has an outlet port and a spare port 14 at its front end, and the outlet port and spare port 14 are arranged side by side. The air compressor 1 is a box-type oil-free air compressor with a pressure output range of 0 to 1.0 MPa, an accuracy class of not less than 0.02, a maximum pressure of 12 bar, a flow rate of 98 L / min, a rated voltage of 220 V, a volume of 6 L, a power of 750 W, and a motor speed of 1400 r / min. It can meet the requirements of the air compressor 1 for calibrating and testing the pressure gauge 5 to be tested.

[0020] like Figure 1-2 As shown, both the outlet port and the standby port 14 are equipped with a switching valve 15, and a start switch 16 is located on the side of the standby port 14. The switching valve 15 and the start switch 16 are located at the front end of the air compressor 1, making it easy to start the air compressor 1. At the same time, the switching valve 15 allows the outlet port and the standby port 14 to be used separately without affecting each other, thus improving calibration efficiency.

[0021] like Figure 3 As shown, a main air switch 43 is installed on the main air duct 41, and a branch switch 44 is installed on the branch duct 42. The railway freight car brake valve test bench 4, the railway freight car heavy vehicle test bench, and the railway freight car 120 valve test bench, etc., are equipped with built-in control switches. These switches can simultaneously open the main air switch 43 and the branch switch 44 to calibrate and test multiple pressure gauges 5 at the same time. They can also close some pressure gauges 5 and test the remaining pressure gauge 5 individually, ensuring the accuracy and reliability of the calibration results.

[0022] The online testing device for railway freight car wind pressure testing equipment provided by this utility model can not only calibrate and test the pressure gauges 5 of equipment such as the railway freight car brake valve test bench 4, the railway freight car heavy vehicle test bench, and the railway freight car 120 valve test bench, but also calibrate and test their pressure sensors. If the values ​​of the reference pressure gauge 2 and the pressure sensor are basically consistent and within the error range, it indicates that the pressure sensor is not faulty.

[0023] The technical solution of this utility model is not limited to the scope of the embodiments described in this utility model. All technical contents not described in detail in this utility model are known technologies.

Claims

1. An online testing device for railway freight car air pressure testing equipment, comprising a railway freight car brake valve test bench (4) and a reference pressure gauge (2), wherein the railway freight car brake valve test bench (4) is equipped with a main air duct (41) and branch air ducts (42) inside its housing, and a pressure gauge (5) to be tested is installed at the upper end of the railway freight car brake valve test bench (4), characterized in that, One end of the main air duct (41) of the railway freight car brake valve test bench (4) is connected to the pressure gauge (5) to be tested through a branch pipe (42), and the other end of the main air duct (41) is connected to the air compressor (1) through the explosion-proof air pipe (3); the air compressor (1) is provided with a three-way pipe (11) at the air outlet, the upper end of the three-way pipe (11) is connected to the reference pressure gauge (2), and the other end of the three-way pipe (11) is connected to the explosion-proof air pipe (3).

2. The online detection device for railway freight car wind pressure testing equipment according to claim 1, characterized in that, One end of the explosion-proof air pipe (3) is connected to a tee pipe (11) via a quick-connect plug, and the other end of the explosion-proof air pipe (3) is connected to the main air duct of the railway freight car brake valve test bench (4) or the centralized control test air system equipment via a tee.

3. The online detection device for railway freight car wind pressure testing equipment according to claim 1, characterized in that, The air compressor (1) is a box-type oil-free air compressor. The pressure output range of the air compressor (1) is 0 to 1.0 MPa, and the accuracy class is not lower than 0.

02.

4. The online detection device for railway freight car wind pressure testing equipment according to claim 1, characterized in that, The air compressor (1) is provided with a handle (13) at the top and an adjustable support leg (12) at the bottom.

5. The online detection device for railway freight car wind pressure testing equipment according to claim 1, characterized in that, The air compressor (1) is provided with an air outlet port and a spare port (14) at the front end, and the air outlet port and the spare port (14) are arranged side by side.

6. The online detection device for railway freight car wind pressure testing equipment according to claim 5, characterized in that, Both the outlet port and the backup port (14) are equipped with a switch valve (15), and the backup port (14) is equipped with a start switch (16) on its side.

7. The online detection device for railway freight car wind pressure testing equipment according to claim 1, characterized in that, The main air duct (41) is equipped with a main air switch (43), and the branch duct (42) is equipped with a branch switch (44).

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