Subway train relay contact detecting and cleaning device

Abstract

The utility model provides a subway train relay contact detecting and cleaning device which comprises a distribution box body and a relay contact detecting and cleaning mechanism, and the relay contact detecting and cleaning mechanism is installed and integrated in the distribution box body. The relay contact detection and cleaning mechanism comprises a switching power supply module, a detection circuit module and a relay wire holder. Specifically, the detection circuit module comprises a contact resistance detection circuit, a pull-in and release voltage test circuit, a contact cleaning circuit, a high-frequency on-off detection circuit and a pull-in and release time test circuit. According to the utility model, the device integrates the functions of relay normally-closed contact resistance detection, normally-open contact resistance detection, pull-in and release voltage test, pull-in and release time test, high-frequency on-off detection and contact cleaning, and is simple in structure, relatively high in detection efficiency and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of relay testing technology, specifically to a device for testing and cleaning relay contacts in subway trains. Background Technology

[0002] In the control circuit of rail trains, B400, D-U204, and D8-U204 type relays are mainly used. According to the maintenance and operation manual and circuit technical requirements provided by the relay manufacturer, the relays should be inspected every 3 years. The inspection mainly includes visual inspection, coil resistance measurement, and contact resistance measurement.

[0003] The shortcomings and deficiencies of existing technologies: The equipment currently available on the market that can test related relays has limited testing capabilities. For example, it does not have the function of cleaning the oxidation of relay contacts, and the testing cost is high, the structure is complex, and the efficiency is low. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a device for detecting and cleaning relay contacts in subway trains.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A relay contact detection and cleaning device for subway trains includes: a distribution box housing; and a relay contact detection and cleaning mechanism integrated within the distribution box housing, comprising a switching power supply module, a detection circuit module, and a relay terminal block. The detection circuit module includes: a contact resistance detection circuit electrically connected to the switching power supply module and the relay terminal block, used to detect the resistance values ​​of normally closed contacts, normally open contacts, and coils; a pull-in and release voltage test circuit electrically connected to the switching power supply module and the relay terminal block, used to test the pull-in voltage of the relay when energized and the release voltage of the relay when de-energized; a contact cleaning circuit electrically connected to the switching power supply module and the relay terminal block, used to clean the relay contacts using current; a high-frequency on / off detection circuit electrically connected to the switching power supply module and the relay terminal block, used to detect the number of times the relay contacts pull in using high-frequency on / off switching; and a pull-in and release time test circuit electrically connected to the switching power supply module and the relay terminal block, used to test the pull-in and release times of the coil when the relay contacts are energized and de-energized.

[0007] The switching power supply module includes an AC220V to DC110V power supply module, an AC220V to DC24V power supply module, and an adjustable power supply module, wherein the adjustable power supply module is a digital display adjustable power supply module.

[0008] The relay terminal block includes a normally closed contact resistance measurement terminal block, a normally open contact resistance measurement terminal block, a pull-in and release voltage terminal block, a switching time test terminal block, a contact cleaning terminal block, and a high-frequency switching terminal block.

[0009] The contact resistance detection circuit includes multiple ohmmeters, which are electrically connected to the AC220V to DC24V power module. Each ohmmeter is also electrically connected to both the normally closed and normally open contact resistance measurement terminals, which are used to connect the relay to be tested. A normally open contact test button is electrically connected between the ohmmeter and the normally open contact resistance measurement terminal, and the normally open contact resistance measurement terminal is electrically connected to the AC220V to DC110V power module.

[0010] The pull-in and release voltage test circuit includes a pull-in indicator light, the AC220V to DC24V power supply module is electrically connected to the pull-in indicator light, the pull-in indicator light is electrically connected to the pull-in and release voltage terminal block, the pull-in and release voltage terminal block is used to connect the relay to be tested; the adjustable power supply module is electrically connected to the pull-in and release voltage terminal block.

[0011] The contact cleaning circuit includes an intermediate relay and a current-limiting resistor; the AC220V to DC24V power module is electrically connected to the current-limiting resistor, the current-limiting resistor is electrically connected to the intermediate relay, the intermediate relay is electrically connected to the contact cleaning terminal block, and the contact cleaning terminal block is used to connect the relay to be cleaned; the AC220V to DC110V power module is electrically connected to the intermediate relay, a cleaning button is electrically connected between the AC220V to DC110V power module and the intermediate relay, and a PLC is electrically connected between the AC220V to DC110V power module and the contact cleaning terminal block; the contact cleaning terminal block is also electrically connected to an air switch.

[0012] The high-frequency continuity detection circuit includes an intermediate relay two. The AC220V to DC24V power supply module is electrically connected to the intermediate relay two. The intermediate relay two is electrically connected to the high-frequency continuity terminal block, which is used to connect the relay to be tested. The PLC is electrically connected to the intermediate relay two and the high-frequency continuity terminal block, and the PLC is also electrically connected to a touch screen. The AC220V to DC110V power supply module is electrically connected to the intermediate relay two and the high-frequency continuity terminal block, respectively.

[0013] The engagement and release time test circuit includes a time test button and an intermediate relay three; the AC220V to DC24V power supply module is electrically connected to the time test button, the time test button is electrically connected to the intermediate relay three, the intermediate relay three is electrically connected to the on / off time test terminal block, and the on / off time test terminal block is used to connect the relay to be tested; the AC220V to DC110V power supply module is electrically connected to the intermediate relay three; the PLC is electrically connected to the intermediate relay three and the on / off time test terminal block respectively.

[0014] The beneficial effects of this utility model are:

[0015] This utility model relates to a subway train relay contact detection and cleaning device, which integrates the detection of normally closed contact resistance, normally open contact resistance, pull-in and release voltage testing, pull-in and release time testing, high-frequency continuity testing, and contact cleaning. It features a simple structure, high detection efficiency, and ease of use. Specifically, this utility model uses a high-precision ohmmeter to accurately detect the resistance of the relay's normally closed and normally open contacts and coil, resulting in minimal detection error. The adjustable voltage module can quickly determine the relay's pull-in and release voltage range. Arc cleaning of the relay contacts effectively removes oxides from the contact surface. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the subway train relay contact detection and cleaning device according to an embodiment of the present utility model;

[0017] Figure 2 This is a block diagram of a contact resistance detection circuit according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the contact resistance detection circuit connection according to one embodiment of the present invention;

[0019] Figure 4 This is a block diagram of the pull-in and release voltage test circuit according to one embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the connection of the pull-in and release voltage test circuit according to an embodiment of the present invention;

[0021] Figure 6 This is a block diagram of the contact cleaning circuit according to one embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the contact cleaning circuit connection according to one embodiment of the present invention;

[0023] Figure 8 This is a block diagram of a high-frequency on / off detection circuit according to an embodiment of the present invention;

[0024] Figure 9 This is a schematic diagram of the high-frequency on / off detection circuit connection according to an embodiment of the present invention;

[0025] Figure 10 This is a block diagram of the connection of the attraction and release time test circuit according to an embodiment of the present invention;

[0026] Figure 11 This is a schematic diagram of the connection of the suction and release time test circuit according to one embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10-Distribution box enclosure; 20-Ohmmeter; 30-Relay terminal block; 40-Activation indicator light; 50-Normally open contact test button; 60-Cleaning button; 70-Time test button; 80-Touch screen; 90-Air switch; 100-Adjustable power module. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1-11 As shown in the figure, a subway train relay contact detection and cleaning device according to an embodiment of the present invention includes a power distribution box 10 and a relay contact detection and cleaning mechanism, wherein the relay contact detection and cleaning mechanism is installed and integrated inside the power distribution box 10.

[0031] The relay contact detection and cleaning mechanism includes a switching power supply module, a detection circuit module, and a relay terminal block 30. Specifically, the detection circuit module includes: a contact resistance detection circuit, a pull-in and release voltage test circuit, a contact cleaning circuit, a high-frequency continuity detection circuit, and a pull-in and release time test circuit.

[0032] The contact resistance detection circuit is electrically connected to the switching power supply module and relay terminal 30 to detect the resistance values ​​of normally closed contacts, normally open contacts, and coils. The pull-in and release voltage test circuit is electrically connected to the switching power supply module and relay terminal 30 to test the pull-in voltage of the relay when energized and the release voltage of the relay when de-energized. The contact cleaning circuit is electrically connected to the switching power supply module and relay terminal 30 to clean the relay contacts using current. The high-frequency on / off detection circuit is electrically connected to the switching power supply module and relay terminal 30 to detect the number of times the relay contacts pull in using high-frequency on / off switching. The pull-in and release time test circuit is electrically connected to the switching power supply module and relay terminal 30 to test the pull-in and release times of the coil when the relay contacts are energized and de-energized.

[0033] In one embodiment of the present invention, the switching power supply module includes an AC220V to DC110V power supply module, an AC220V to DC24V power supply module, and an adjustable power supply module 100.

[0034] In one embodiment of this utility model, the relay terminal block 30 includes a normally closed contact resistance measurement terminal block, a normally open contact resistance measurement terminal block, a pull-in and release voltage terminal block, a switching time test terminal block, a contact cleaning terminal block, and a high-frequency switching terminal block. By providing six different functional terminal blocks, the use of one function is prevented from affecting the detection data of other functions.

[0035] like Figure 2 and Figure 3 As shown, in one embodiment of this utility model, the contact resistance detection circuit includes multiple ohmmeters 20, which are electrically connected to an AC220V to DC24V power module. The ohmmeters 20 are also electrically connected to normally closed contact resistance measurement terminals and normally open contact resistance measurement terminals, which are used to connect the relay to be tested. A normally open contact test button 50 is electrically connected between the ohmmeters 20 and the normally open contact resistance measurement terminals, and the normally open contact resistance measurement terminals are electrically connected to the AC220V to DC110V power module.

[0036] In a specific embodiment of this utility model, the ohmmeter 20 is a Feiyang Measurement and Control AD4R type automatic range ohmmeter 20, with a measurement range of 1mΩ-10Ω, a resolution of 1mΩ, and an accuracy of 0.5%.

[0037] For the contact resistance detection function, a 24V power supply is used to power the ohmmeter 20. The measurement interface on the high-precision ohmmeter 20 is connected to the corresponding detection contacts on the terminal block via wires. The meter head measures the resistance values ​​of normally closed contacts, normally open contacts, and relay coils. This design avoids the influence of measuring the resistance of different contacts when measuring the same contact resistance value.

[0038] When measuring the resistance of normally closed contacts, connect the relay power supply plug to the power source and turn the main circuit breaker to the closed position. Correctly insert the relay into the terminal block corresponding to the normally closed contact. The resistance value of the normally closed contact can then be directly read using an ohmmeter.

[0039] When measuring the resistance of normally open contacts, insert the relay into the terminal block corresponding to the normally open contact, press the normally open contact test button 50, the relay is energized and the normally open contact becomes a normally closed contact, and the resistance value of the contact can be directly read by the ohmmeter 20.

[0040] like Figure 4 and Figure 5 As shown, in one embodiment of this utility model, the pull-in and release voltage test circuit includes a pull-in indicator light 40, an AC220V to DC24V power supply module electrically connected to the pull-in indicator light 40, the pull-in indicator light 40 electrically connected to the pull-in and release voltage terminal block, the pull-in and release voltage terminal block being used to connect the relay to be tested; and an adjustable power supply module 100 electrically connected to the pull-in and release voltage terminal block.

[0041] In this embodiment of the invention, the input voltage is adjusted by the adjustable power module 100 to energize and de-energize the relay coil, thereby testing the relay's pull-in and release voltages. When the relay is energized, the normally open contact closes, and the pull-in indicator light 40 illuminates. Specifically, the adjustable power module 100 is a digital display adjustable power module 100 with a voltage display function, allowing the pull-in voltage value to be recorded. When the relay is de-energized, the normally open contact opens, the pull-in indicator light 40 goes out, and the release voltage value can be recorded by the adjustable power module 100.

[0042] Specifically, during the pull-in and release voltage test, the relay is inserted into the pull-in and release voltage terminal block. Turning the voltage knob of the adjustable power module 100 clockwise energizes the relay coil, causing the normally open contact to become a normally closed contact. The pull-in indicator light 40 illuminates upon energization, and the pull-in voltage can be directly read at this point. Turning the voltage knob of the adjustable power module 100 counterclockwise de-energizes the relay coil, causing the pull-in indicator light 40 to extinguish. The release voltage can then be directly read.

[0043] like Figure 6 and Figure 7As shown, in one embodiment of this utility model, the contact cleaning circuit includes an intermediate relay and a current-limiting resistor; an AC220V to DC24V power module is electrically connected to the current-limiting resistor, the current-limiting resistor is electrically connected to the intermediate relay, the intermediate relay is electrically connected to the contact cleaning terminal block, and the contact cleaning terminal block is used to connect the relay to be cleaned; an AC220V to DC110V power module is electrically connected to the intermediate relay, a cleaning button 60 is electrically connected between the AC220V to DC110V power module and the intermediate relay, and a PLC is electrically connected between the AC220V to DC110V power module and the contact cleaning terminal block. In addition, the contact cleaning terminal block is also electrically connected to an air switch 90.

[0044] In its contact cleaning function design, this invention uses the closing of an air switch 90 to clean a specific contact. An AC220V to DC110V power module energizes the coil of intermediate relay one, while an AC220V to DC24V power module generates a 2A current to clean the contacts. Specifically, an AC220V to DC24V power module connected in series with a 12Ω current-limiting resistor R continuously provides a stable 2A current for 20 contact cleaning cycles, preventing resistance changes in other relay contacts due to prolonged power supply while cleaning a single contact.

[0045] like Figure 8 and Figure 9 As shown, in one embodiment of this utility model, the high-frequency on / off detection circuit includes an intermediate relay two, an AC220V to DC24V power supply module electrically connected to the intermediate relay two, the intermediate relay two electrically connected to the high-frequency on / off terminal block, the high-frequency on / off terminal block being used to connect the relay to be tested; a PLC electrically connected to the intermediate relay two and the high-frequency on / off terminal block respectively, and the PLC is also electrically connected to a touch screen 80; the AC220V to DC110V power supply module is electrically connected to the intermediate relay two and the high-frequency on / off terminal block respectively.

[0046] When performing high-frequency continuity testing, a PLC is used to control the number of relay actions. By setting the number of actions, the contact engagement status can be detected. By setting the number of actions, it is possible to detect which contacts on the relay are engaged normally and which contacts are not engaged normally.

[0047] Specifically, insert the relay into the high-frequency switching terminal block, set the "preset number of times" on the touch screen 80, and start it to perform high-frequency switching tests. The touch screen 80 can record the number of times each contact is engaged, so as to know whether there is a contact failure phenomenon.

[0048] like Figure 10 and Figure 11As shown, in one embodiment of this utility model, the engagement and release time test circuit includes a time test button 70 and an intermediate relay three; an AC220V to DC24V power supply module is electrically connected to the time test button 70, the time test button 70 is electrically connected to the intermediate relay three, the intermediate relay three is electrically connected to the on / off time test terminal block, and the on / off time test terminal block is used to connect the relay to be tested; an AC220V to DC110V power supply module is electrically connected to the intermediate relay three; and a PLC is electrically connected to the intermediate relay three and the on / off time test terminal block respectively.

[0049] When performing the pull-in time test, timing begins when the relay coil is energized and ends when the normally open contact pulls in. When performing the release time test, timing begins when the relay coil is de-energized and ends when the normally open contact opens. Specifically, insert the relay into the on / off time test terminal block, press the time test button 70, and then reset it once to calculate the relay contact pull-in and release times. The corresponding data is recorded via the touchscreen 80.

[0050] The subway train relay contact detection and cleaning device according to the present utility model integrates the detection of normally closed contact resistance, normally open contact resistance, pull-in and release voltage test, pull-in and release time test, high-frequency continuity test, and contact cleaning. It has a simple structure, high detection efficiency, and is easy to use.

[0051] Specifically, this invention uses a high-precision ohmmeter 20 to accurately detect the resistance values ​​of the normally closed and normally open contacts and coil of the relay, with small detection errors; the adjustable voltage module can quickly determine the voltage range for the relay to engage and disengage; and the relay contacts can be cleaned by electric arc, which can effectively remove oxides from the contact surface.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for detecting and cleaning relay contacts in subway trains, characterized in that, include: Distribution box enclosure; The relay contact detection and cleaning mechanism is integrated into the distribution box, including a switching power supply module, a detection circuit module, and a relay terminal block; wherein... The detection circuit module includes: The contact resistance detection circuit is electrically connected to the switching power supply module and the relay terminal block, and is used to detect the resistance of normally closed contacts, normally open contacts, and coil resistance. The pull-in and release voltage test circuit is electrically connected to the switching power supply module and the relay terminal block, and is used to test the pull-in voltage of the relay when it is energized and the release voltage of the relay when it is de-energized. The contact cleaning circuit is electrically connected to the switching power supply module and the relay terminal block, and is used to clean the relay contacts by passing current. A high-frequency on / off detection circuit is electrically connected to the switching power supply module and the relay terminal block, and is used to detect the number of times the relay contacts are engaged by high-frequency on / off detection. The pull-in and release time test circuit is electrically connected to the switching power supply module and the relay terminal block, and is used to test the pull-in and release time of the coil when the relay contacts are energized and de-energized.

2. The subway train relay contact detection and cleaning device according to claim 1, characterized in that, The switching power supply module includes an AC220V to DC110V power supply module, an AC220V to DC24V power supply module, and an adjustable power supply module, wherein the adjustable power supply module is a digital display adjustable power supply module.

3. The subway train relay contact detection and cleaning device according to claim 2, characterized in that, The relay terminal block includes a normally closed contact resistance measurement terminal block, a normally open contact resistance measurement terminal block, a pull-in and release voltage terminal block, a switching time test terminal block, a contact cleaning terminal block, and a high-frequency switching terminal block.

4. The subway train relay contact detection and cleaning device according to claim 3, characterized in that, The contact resistance detection circuit includes multiple ohmmeters, which are electrically connected to the AC220V to DC24V power module. Each ohmmeter is also electrically connected to both the normally closed and normally open contact resistance measurement terminals, which are used to connect the relay to be tested. A normally open contact test button is electrically connected between the ohmmeter and the normally open contact resistance measurement terminal, and the normally open contact resistance measurement terminal is electrically connected to the AC220V to DC110V power module.

5. The subway train relay contact detection and cleaning device according to claim 3, characterized in that, The pull-in and release voltage test circuit includes a pull-in indicator light, the AC220V to DC24V power supply module is electrically connected to the pull-in indicator light, the pull-in indicator light is electrically connected to the pull-in and release voltage terminal block, the pull-in and release voltage terminal block is used to connect the relay to be tested; the adjustable power supply module is electrically connected to the pull-in and release voltage terminal block.

6. The subway train relay contact detection and cleaning device according to claim 3, characterized in that, The contact cleaning circuit includes an intermediate relay and a current-limiting resistor; the AC220V to DC24V power module is electrically connected to the current-limiting resistor, the current-limiting resistor is electrically connected to the intermediate relay, the intermediate relay is electrically connected to the contact cleaning terminal block, and the contact cleaning terminal block is used to connect the relay to be cleaned; the AC220V to DC110V power module is electrically connected to the intermediate relay, a cleaning button is electrically connected between the AC220V to DC110V power module and the intermediate relay, and a PLC is electrically connected between the AC220V to DC110V power module and the contact cleaning terminal block; the contact cleaning terminal block is also electrically connected to an air switch.

7. The subway train relay contact detection and cleaning device according to claim 6, characterized in that, The high-frequency continuity detection circuit includes an intermediate relay two. The AC220V to DC24V power supply module is electrically connected to the intermediate relay two. The intermediate relay two is electrically connected to the high-frequency continuity terminal block, which is used to connect the relay to be tested. The PLC is electrically connected to the intermediate relay two and the high-frequency continuity terminal block, and the PLC is also electrically connected to a touch screen. The AC220V to DC110V power supply module is electrically connected to the intermediate relay two and the high-frequency continuity terminal block, respectively.

8. The subway train relay contact detection and cleaning device according to claim 7, characterized in that, The engagement and release time test circuit includes a time test button and an intermediate relay three; the AC220V to DC24V power supply module is electrically connected to the time test button, the time test button is electrically connected to the intermediate relay three, the intermediate relay three is electrically connected to the on / off time test terminal block, and the on / off time test terminal block is used to connect the relay to be tested; the AC220V to DC110V power supply module is electrically connected to the intermediate relay three; the PLC is electrically connected to the intermediate relay three and the on / off time test terminal block respectively.

Images