Portable railway vehicle relay automatic detection and contact cleaning device

Abstract

A portable railway vehicle relay automatic detection and contact cleaning device comprises an air circuit breaker, a time relay and a relay test panel. The upper part of the test panel is provided with an ammeter, a voltmeter, a ZN48 type measuring device, an AC / DC power indicating lamp, a manual test button, an ammeter bypass switch, a relay coil connection button, a relay contact indicating lamp connection button, a relay normally-closed contact indicating lamp, a relay normally-open contact indicating lamp, a connecting wire and a relay socket. The lower part of the test panel is provided with an AC 220V-to-DC 110V module. The ZN48 type measuring device is matched with the time relay, and the AC220V-to-DC110V module provides a direct-current power supply for the circuit. According to the utility model, three series of relays can be detected at the same time, each channel of the relay is flexibly switched, and the detection efficiency of the vehicle relay is greatly improved. The number of actions is set through the ZN48 type measuring device, and cleaning of the relay contact is achieved.

Description

Technical Field

[0001] This utility model relates to the field of relay testing technology for electrical control circuits of rail vehicles, and more specifically to a portable automatic detection and contact cleaning device for rail vehicle relays. Background Technology

[0002] Relays are used for logic control in circuits. They possess logic memory capabilities and can form complex logic control circuits. Relays convert changes in electrical or non-electrical quantities into switching signals to achieve automatic circuit control. Relays are widely used as primary control components in the electrical control circuits of rail vehicles, with the type of relay selected based on actual control needs. There are many types of relays, which can be categorized by input quantity as voltage relays, current relays, time relays, speed relays, and pressure relays. Rail vehicles widely use DC 110V voltage relays and time relays as control components in various systems, including traction systems, braking systems, signaling and automatic driving systems, network systems, head and tail control systems, battery control systems, air compressor control systems, and door control systems. During on-site maintenance and repair of operating vehicles in after-sales service, vehicle malfunctions caused by poor relay contact or faults are frequently encountered, sometimes requiring vehicle rescue and negatively impacting vehicle quality. Relays, as fundamental control units in rail vehicles, are characterized by their large quantity, concealed faults, and unstable contact. When a relay experiences contact malfunction or oxidation, subsequent operation may temporarily resolve the fault, but it will recur at some point. Therefore, locating the fault is difficult, requiring vehicle impoundment, wasting manpower and resources, and introducing instability and safety hazards into vehicle operation. Sometimes, the fault disappears after the vehicle returns to the depot, and to ensure operation, all suspected relays in the faulty circuit are replaced with new ones, resulting in significant relay waste over time. Currently, there is no such detection and cleaning device in China, and foreign equipment is very expensive. Therefore, this invention provides a portable automatic detection and contact cleaning device for rail vehicle relays. Using this device to detect relays and clean contacts effectively eliminates the potential for relay malfunction, allows for relay reuse, effectively avoids relay waste, and significantly improves vehicle operational stability. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a portable automatic detection and contact cleaning device for rail vehicle relays to solve the problems existing in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A portable automatic detection and contact cleaning device for railway vehicle relays includes a main housing, an air circuit breaker and a time relay installed inside, a relay test panel, and an AC220V to DC110V power supply module at the bottom of the test panel. The test panel, from left to right, includes an ammeter, a voltmeter, a manual test button; AC power indicator lights, DC power indicator lights, an ammeter bypass switch, a ZN48 type measuring instrument; various types of relay sockets, normally open relay contact indicator lights, normally closed relay contact indicator lights, and relay coil activation buttons and relay contact indicator activation buttons. The relay sockets are used to fix and connect the relay to be tested. The ZN48 type measuring instrument and the time relay work together to control and set various actions of the relay to be tested and to clean the relay contacts.

[0006] Furthermore, the air circuit breaker includes an AC power switch QF1, a DC power switch QF2, and a DC power switch QF3 located on the left side inside the main body of the enclosure. The DC power switch QF3 is located to the left of the AC power switch QF1, and the DC power switch QF2 is located to the right of the AC power switch QF1. These switches serve as control switches for both AC220V and DC110V input power and provide short-circuit and overload protection for the entire circuit.

[0007] Furthermore, a time relay KT is provided on the lower side of the AC power switch QF1. The time relay KT is equipped with a working indicator light and has a delay range of 0-100 minutes. One end of the normally closed contact of the time relay KT, which opens after a delay, is connected to the AC power switch QF1 after passing through the SB8 switch, and the other end is connected to the coil of the ZN48 meter to control the working time of the ZN48 meter.

[0008] Furthermore, the first column on the left side of the relay test panel inside the main body of the enclosure is equipped with an ammeter, a voltmeter, and a manual test button. The ammeter has a full-scale range of DC 100mA and is used to indicate the coil current of the relay under test; the voltmeter has a full-scale range of DC 150V and is used to indicate the coil voltage of the relay under test; the manual test button is self-resetting and is used for the manual test mode of the relay under test.

[0009] Furthermore, the second column on the left side of the relay test panel is equipped with an AC power indicator light, a DC power indicator light, an ammeter bypass switch SB7, a time relay control button SB8, and a ZN48 measuring instrument. The AC power indicator light is AC220V, used for AC power indication; the DC power indicator light is DC110V, used for DC power indication; the ammeter bypass switch SB7 can be closed when the relay under test does not need to detect current, bypassing the ammeter, for example, when cleaning the relay contacts, thus improving the ammeter's lifespan; the time relay control button SB8 is connected to the AC power switch QF1 at one end and to the coil of the time relay KT at the other end, thus controlling when the time relay is activated; the ZN48 measuring instrument is connected to the normally closed contact of the time relay KT at one end and to the N pole of the AC power supply at the other end, and is the core component of the entire device. The ZN48 intelligent dual digital display measuring instrument can set the entire circuit's on and off time, with a time setting range of 0-9999 seconds, and simultaneously displays the number of on and off cycles. Combined with the electronic time relay KT, it allows for free setting of the operating time and number of cycles of the relay under test.

[0010] Furthermore, the third column on the left side of the relay test panel is equipped with a D-U204 series relay socket, a normally open relay contact indicator light, a normally closed relay contact indicator light, a relay coil energizing button SB1, and a relay contact indicator light energizing button SB4. The relay socket secures and connects the D-U204 series relays, and the socket wiring and control panel perforations are protected with insulating material. The normally open and normally closed relay contact indicator lights correspond to the output contact circuits of the relay under test, so that each output channel of the relay under test is connected in series with its corresponding indicator light to form an indicating circuit. The relay coil energizing button SB1 controls when the D-U204 series relay coil is engaged for testing; the relay contact indicator light energizing button SB4 controls when the corresponding indicator light in the D-U204 series relay contact circuit is engaged.

[0011] Furthermore, the fourth column on the left side of the relay test panel is equipped with a B400 series relay socket, a normally open relay contact indicator light, a normally closed relay contact indicator light, a relay coil energizing button SB2, and a relay contact indicator light energizing button SB5. The relay socket secures and connects the B400 series relays, and the socket wiring and control panel perforations are protected with insulating material. The normally open and normally closed relay contact indicator lights correspond to the output contact circuits of the relay under test, so that each output channel of the relay under test is connected in series with its corresponding indicator light to form an indicating circuit. The relay coil energizing button SB2 controls when the B400 series relay coil is engaged for testing. The relay contact indicator light energizing button SB5 controls when the corresponding indicator light of the B400 series electrical contact circuit is engaged.

[0012] Furthermore, the fifth column on the left side of the relay test panel is equipped with a TDE4-U204 series time relay socket, a normally open relay contact indicator light, a normally closed relay contact indicator light, a relay coil activation button SB3, and a relay contact indicator light activation button SB6. The relay socket secures and connects the TDE4-U204 series relays, and the socket wiring and control panel perforations are protected with insulating material. The normally open and normally closed relay contact indicator lights correspond to the output contact circuits of the relay under test, so that each output channel of the relay under test is connected in series with its corresponding indicator light to form an indication circuit. The relay coil activation button SB3 controls when the TDE4-U204 series relay coil is engaged for testing. The relay contact indicator light activation button SB6 controls when the corresponding indicator light of the TDE4-U204 series electrical contact circuit is activated.

[0013] Furthermore, the lower part of the relay test panel is equipped with an AC220V to DC110V power supply module to provide DC power for the entire device. When testing on a vehicle, since there is a DC110V power supply on the vehicle, it can be directly connected to the input terminal of the QF2 circuit breaker of the device via a cable. When testing on the ground, since there is generally no DC110V power supply on the ground, the AC220V power supply on the ground can be directly connected to the input terminal of the QF1 circuit breaker of the device. The AC220V to DC110V power supply module then converts the AC220V to DC110V power to provide DC power to the detection circuit, thereby enabling the device to perform testing work at any location on the ground or in a vehicle.

[0014] Compared with the prior art, the technical effects and advantages of this utility model are as follows:

[0015] 1. The portable automatic performance testing box for urban rail vehicle relays can perform performance tests on the three most commonly used relay series in rail vehicles: B400, D-U204, and TDE4-U204. It can also test relays that use sockets compatible with these three series. Its features include simple structure, easy operation, and the ability to simultaneously test and individually test the three series of relays. It is particularly effective for individually adjusting and testing the time setting accuracy of the TDE4-U204 series time relays.

[0016] 2. It has two detection modes: manual and automatic. The automatic detection mode adopts the advanced ZN48 intelligent dual digital display measuring instrument combined with electronic time relay, so as to realize the free setting of relay action time and action number, which greatly improves detection efficiency.

[0017] 3. The different states of the indicator lights indicate whether the relay contacts are engaged or disengaged. The observation method is simple and intuitive, and the stability of the relay operation can be quickly determined. At the same time, the coil voltage and current values ​​of the relay under test can be observed in real time during use, which improves the versatility of the detection device and expands the detection range.

[0018] 4. By setting the ZN48 intelligent dual-digital display tester, the relay contacts are continuously engaged and disengaged, achieving a relay contact cleaning function. This eliminates potential problems with poor relay contact and ensures that the contact resistance meets standards. The ZN48 intelligent dual-digital display tester is simple to set up, displays the action time and number of actions in real time, facilitates observation, and improves the functional stability of the tested rail vehicle relays, thereby enhancing the overall functional stability of the rail vehicle.

[0019] 5. The testing box is equipped with both AC220V and DC110V input power supplies. It is portable and mobile, and can be used for testing in or out of vehicles, greatly increasing the practicality of the device.

[0020] 6. After testing with this device, the faulty relays can be located and replaced with good ones. All relays in the faulty circuit of the rail vehicle can be reused after passing inspection, avoiding previous erroneous replacements and enabling preventive replacements. This effectively avoids relay waste and improves overall economic efficiency. Attached Figure Description

[0021] Figure 1 This is a physical image of the outer casing of the box according to the present invention.

[0022] Figure 2 This is a physical diagram showing the installation location of the internal electrical components of the present invention.

[0023] Figure 3 This is a schematic diagram of the relay coil control circuit of the present invention.

[0024] Figure 4 This is a schematic diagram of the relay contact indicator control circuit of the present invention.

[0025] The attached diagram is labeled as follows: 1. Main body of the enclosure; 2. Cover; 3. Cover locking hook; 4. Armature handle; 5. AC power switch QF1; 6. DC power switch QF2; 7. DC power switch QF3; 8. Relay test panel; 9. Time relay KT; 10. External power cord; 11. Ammeter; 12. Voltmeter; 13. AC power indicator light; 14. DC power indicator light; 15. Manual test button; 16. Ammeter bypass switch SB7; 17. Time relay control switch SB8; 18. ZN48 type measuring instrument; 21. D-U204 series relay socket; 22. D-U204 series relay; 23. D-U204 series relay normally open contact indicator light; 24. D-U204 series relay normally closed contact indicator light; 25. Relay coil energizing button SB. 1. 26. Relay contact indicator light on button SB4; 31. B400 series relay socket; 32. B400 series relay; 33. B400 series relay normally open contact indicator light; 34. B400 series relay normally closed contact indicator light; 35. Relay coil on button SB2; 36. Relay contact indicator light on button SB5; 41. TDE4-U204 series time relay socket; 42. TDE4-U204 series time relay; 43. TDE4-U204 series relay normally open contact indicator light; 44. TDE4-U204 series relay normally closed contact indicator light; 45. Relay coil on button SB3; 46. Relay contact indicator light on button SB6; 51. Connecting wire; 52. Connecting wire control panel perforated protective sleeve. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments.

[0027] See Figure 1-4 This invention provides a portable automatic detection and contact cleaning device for rail vehicle relays, including a detection housing body 1 and an external power cord 10. An AC power switch QF15, a DC power switch QF26, and a DC power switch QF37 are arranged on the left side inside the housing body 1. A time relay KT9 is arranged on the lower left side inside the housing body 1. The time relay KT9 is equipped with a working indicator light and has a delay range of 0-100 minutes. A relay test panel 8 is arranged on the right side inside the housing body 1.

[0028] Furthermore, in order to make the device easy to carry and move, in this embodiment, the main body 1 of the box is provided with a cover 2, a cover locking hook 3, and a box handle 4.

[0029] Furthermore, the first column on the left side of the relay test panel 8 is equipped with an ammeter 11, a voltmeter 12, and a manual test button 15. The ammeter 11 has a full-scale range of DC 100mA and is used to indicate the coil current of the relay under test; the voltmeter 12 has a full-scale range of DC 150V and is used to indicate the coil voltage of the relay under test; the manual test button 15 is self-resetting and is used for the manual test mode of the relay under test.

[0030] Furthermore, the second column on the left side of the relay test panel 8 is equipped with an AC power indicator light 13, a DC power indicator light 14, an ammeter bypass switch SB716, a time relay control button SB817, and a ZN48 type measuring instrument 18. The AC power indicator 13 is AC220V and is used for AC power indication; the DC power indicator 14 is DC110V and is used for DC power indication; the ammeter bypass switch SB716 can be closed when the relay under test does not need to detect current, bypassing the ammeter, for example, when cleaning the relay contacts, thus improving the ammeter's service life; the time relay control button SB817 is connected to the AC power switch QF1 at one end and to the coil of the time relay KT at the other end, thereby controlling when the time relay is activated; the ZN48 type measuring instrument 18 is connected to the normally closed contact of the time relay KT9 at one end and to the N pole of the AC power supply at the other end, and is the core component of the entire device. The ZN48 type intelligent dual digital display measuring instrument 18 can set the entire circuit's on and off time, with a time setting range of 0-9999 seconds, and simultaneously displays the number of on and off times. Combined with the electronic time relay KT9, it can freely set the action time and number of actions of the relay under test.

[0031] Furthermore, the third column on the left side of the relay test panel 8 is equipped with a D-U204 series relay socket 21, a normally open relay contact indicator 23, a normally closed relay contact indicator 24, a relay coil energizing button SB1 25, a relay contact indicator energizing button SB4 26, a socket wiring 51, and a perforated protective sleeve 52. The relay socket 21 fixes and connects to the D-U204 series relay 22 under test. The socket wiring 51 and the perforated area of ​​the control panel are both protected by the perforated protective sleeve 52. The normally open relay contact indicator 23 and the normally closed relay contact indicator 24 correspond to the output contact circuit of the relay under test 22, so that each output channel of the relay under test 22 is connected in series with the corresponding indicator 23 / 24 to form an indicator circuit. The relay coil energizing button SB1 controls the timing of the D-U204 series relay 22 coil activation for testing. The relay contact indicator energizing button SB4 controls the timing of the corresponding indicator 23 / 24 activation for the D-U204 series relay 22 contact circuit.

[0032] Furthermore, the fourth column on the left side of the relay test panel 8 is equipped with a B400 series relay socket 31, a normally open relay contact indicator light 33, a normally closed relay contact indicator light 34, a relay coil energizing button SB2, a relay contact indicator light energizing button SB5, a socket wiring 51, and a perforated protective sleeve 52. The relay socket 31 secures and connects to the B400 series relay 32 under test. The socket wiring 51 and the perforated area on the control panel are both protected by the perforated protective sleeve 52. The normally open and normally closed relay contact indicator lights 33 and 34 correspond to the output contact circuits of the relay 32 under test, so that each output channel of the relay 32 under test is connected in series with the corresponding indicator light 33 / 34 to form an indicator circuit. The relay coil energizing button SB2 controls when the B400 series relay 32 coil is engaged for testing. The relay contact indicator light energizing button SB5 controls when the corresponding indicator light 33 / 34 in the contact circuit of the B400 series relay 32 is engaged.

[0033] Furthermore, the fifth column on the left side of the relay test panel 8 is equipped with a TDE4-U204 series time relay socket 41, a normally open relay contact indicator 43, a normally closed relay contact indicator 44, a relay coil energizing button SB3, a relay contact indicator energizing button SB6, a socket wiring 51, and a perforated protective sleeve 52. The relay socket 41 fixes and connects to the TDE4-U204 series relay 42 under test. The socket wiring 51 and the perforated area of ​​the control panel are both protected by the perforated protective sleeve 52. The normally open and normally closed relay contact indicator lights 43 and 44 correspond to the output contact circuits of the relay under test 42, so that each output channel of the relay under test 42 is connected in series with the corresponding indicator lights 43 / 44 to form an indicator circuit. The relay coil energizing button SB3 controls when the TDE4-U204 series relay 42 coil is engaged for testing. The relay contact indicator energizing button SB6 controls when the corresponding indicator lights 43 / 44 in the contact circuit of the TDE4-U204 series relay 42 are engaged.

[0034] Testing process

[0035] Taking the B400 model appliance as an example, all switches are in the off state before power is applied.

[0036] Preparation: Install the B400 series relay 32 to be tested on the relay socket 31. Connect the DC power supply QF2 and AC power supplies QF1 and QF3 to power on the device according to the actual conditions. The voltmeter 12 indicates the real-time voltage value; the DC power indicator light 14 lights up.

[0037] 1. Manual testing mode:

[0038] Close the relay coil energizing button SB2 and the relay contact indicator light energizing button SB5. At this time, all normally closed contact indicator lights 34 of the B400 series relay 32 should be illuminated. Press the manual test button 15. The coil of the B400 series relay 32 should be energized. At this time, the ammeter 11 should indicate the current value, its normally closed contact should open, and then all normally closed contact indicator lights 34 should go out. Subsequently, its normally open contact should close, and then all normally open contact indicator lights 33 should be illuminated. Then, disconnect the manual test button 15. The coil of the B400 series relay 32 should be de-energized. Subsequently, its normally open contact should open, and all normally open contact indicator lights 33 should go out. Its normally closed contact should close, and then all normally closed contact indicator lights 34 should be illuminated. The indications of the ammeter 11 and voltmeter 12 are used to determine whether the coil of relay 32 is normal. Since each output channel of the relay 32 under test is connected in series with the corresponding indicator lights 33 / 34 to form an indicating circuit, the normal operation of its normally open and normally closed contacts can be determined.

[0039] 2. Automatic testing mode:

[0040] Close the relay coil energizing button SB2 and the relay contact indicator light energizing button SB5. At this time, all indicator lights 34 of the normally closed contacts of the B400 series relay 32 should be lit. Close the time relay control switch SB8 and set the delay time of the time relay KT9 to 5 minutes, which can be set according to actual needs. The time relay KT9 has a working indicator light, with a setting range of 0-100 minutes. Then set the contact opening and closing action time of the ZN48 type measuring instrument 18 to 5 seconds each time, which can be set according to actual needs, with a time setting range of 0-9999 seconds. After setting, the coil of the B400 series relay 32 should automatically energize and de-energize 60 times within 5 minutes. During this process, observe its coil energizing indicator light, normally closed contact indicator light 34, and normally open contact indicator light 33 to determine whether its normally open and normally closed contact operation functions are normal. The test will automatically stop after 5 minutes. This function avoids manually pressing the manual test button 15, thus saving manpower, improving work efficiency, and the wide time setting range increases the practicality of the device.

[0041] 3. Contact cleaning mode:

[0042] When the contacts of the relay 32 under test oxidize due to low usage frequency or poor operating environment, the contact resistance increases, affecting the overall functional stability of the relay 32. In this case, the relay 32 can be installed on this device, and the automatic test mode can be activated. The delay time of the time relay KT9 and the required number of actions of the ZN48 measuring instrument 18 can be set. This allows the contacts of the relay 32 to be cleaned through multiple engagement and disengagement. In this mode, because the relay needs to operate frequently, the relay contact indicator light on / off button SB5 can be disconnected, which can extend the service life of the normally open contact indicator light 33 and the normally closed contact indicator light 34. This function can significantly improve the contact stability of the relay and complete the test in automatic mode, saving manpower and improving work efficiency.

[0043] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A portable track vehicle relay auto-test and contact cleaning device, characterized by, The air circuit breaker and the time relay, the relay test panel, the AC220V to DC110V power module under the test panel are installed in the box body, wherein the relay test panel comprises, from left to right, an ammeter, a voltmeter, a manual test button, an AC power indicator, a DC power indicator, a current meter bypass switch, a ZN48 type meter, various types of relay sockets, a relay normally open contact indicator, a relay normally closed contact indicator, a relay coil on button and a relay contact indicator on button; the relay socket is used for fixing and connecting the relay to be detected; the ZN48 type meter cooperates with the time relay and is used for controlling and setting various actions of the relay to be detected and cleaning the relay contact.

2. A portable track vehicle relay automatic detection and contact cleaning device according to claim 1, characterized in that The air circuit breaker comprises an AC power switch QF1, a DC power switch QF2 and a DC power switch QF3 arranged on the left side of the box body, the DC power switch QF3 is arranged on the left side of the AC power switch QF1, the DC power switch QF2 is arranged on the right side of the AC power switch QF1, the DC power switch QF3 and the DC power switch QF2 are used as the control switches of the AC220V and DC110V input power sources and simultaneously perform short circuit and overload protection on the entire circuit.

3. A portable railway vehicle relay automatic detection and contact cleaning device according to claim 2, characterized in that The time relay KT is arranged on the lower side of the AC power switch QF1, and the working indicator lamp is arranged on the time relay KT; one end of the delay break normally closed contact of the time relay KT is connected to the AC power switch QF1 through the SB8 switch, and the other end is connected to the ZN48 meter coil, so as to control the working time of the ZN48 meter.

4. The automatic detection and contact cleaning device for a relay of a portable railway vehicle according to claim 1, characterized in that The second column on the left side of the relay test panel is provided with an AC power indicator, a DC power indicator, a current meter bypass switch SB7, a time relay control button SB8 and a ZN48 type meter, the current meter bypass switch SB7 is closed when the detected relay does not need to detect current, so as to bypass the ammeter; one end of the time relay control button SB8 is connected to the AC power switch QF1, and the other end is connected to the coil of the time relay KT, so as to control when the time relay works; one end of the ZN48 type meter is connected to the normally closed contact of the time relay KT, and the other end is connected to the N pole of the AC power source, which is the core element of the entire device, the ZN48 type intelligent double digital display meter can set the on and off time of the entire circuit and simultaneously display the on and off times, and the ZN48 type intelligent double digital display meter can realize the free setting of the action time and the action times of the detected relay in combination with the electronic time relay KT.

5. The portable railcar relay automatic detection and contact cleaning device of claim 1, wherein , The third column on the left side of the relay test panel is respectively provided with a D-U204 series relay socket, a relay normally open contact indicator lamp, a relay normally closed contact indicator lamp, a relay coil on button SB1, and a relay contact indicator lamp on button SB4. The relay socket is fixed and connected with a D-U204 series relay, and the socket wiring and the control panel perforation are protected by insulation materials. The relay normally open contact indicator lamp and the normally closed contact indicator lamp correspond to the output contact loop of the measured relay, so that each output channel of the measured relay and the corresponding indicator lamp form an indication loop in series. The relay coil on button SB1 controls the D-U204 series relay coil detection time. The relay contact indicator lamp on button SB4 controls the D-U204 series relay contact loop corresponding indicator lamp.

6. A portable track vehicle relay automatic detection and contact cleaning device according to claim 1, characterized in that , The fourth column on the left side of the relay test panel is respectively provided with a B400 series relay socket, a relay normally open contact indicator lamp, a relay normally closed contact indicator lamp, a relay coil on button SB2, and a relay contact indicator lamp on button SB5. The relay socket is fixed and connected with a B400 series relay, and the socket wiring and the control panel perforation are protected by insulation materials. The relay normally open contact indicator lamp and the normally closed contact indicator lamp correspond to the output contact loop of the measured relay, so that each output channel of the measured relay and the corresponding indicator lamp form an indication loop in series. The relay coil on button SB2 controls the B400 series relay coil detection time. The relay contact indicator lamp on button SB5 controls the B400 series relay contact loop corresponding indicator lamp.

7. The portable railcar relay automatic detection and contact cleaning device of claim 1, wherein , The fifth column on the left side of the relay test panel is respectively provided with a TDE4-U204 series time relay socket, a relay normally open contact indicator lamp, a relay normally closed contact indicator lamp, a relay coil on button SB3, and a relay contact indicator lamp on button SB6. The relay socket is fixed and connected with a TDE4-U204 series relay, and the socket wiring and the control panel perforation are protected by insulation materials. The relay normally open contact indicator lamp and the normally closed contact indicator lamp correspond to the output contact loop of the measured relay, so that each output channel of the measured relay and the corresponding indicator lamp form an indication loop in series. The relay coil on button SB3 controls the TDE4-U204 series relay coil detection time. The relay contact indicator lamp on button SB6 controls the TDE4-U204 series relay contact loop corresponding indicator lamp.

Images