Onboard relay testing device

Abstract

An onboard relay testing device belongs to the technical field of relay testing and comprises a DB9 testing plug, a piano-key switch, a testing switch, a power switch, a relay socket and an LED indicating lamp, the probe tail end of the relay socket is connected with the testing switch, the testing switch is connected with a coil power supply port, the LED indicating lamp is connected with a battery module through the power switch, and the battery module is connected with the power switch. The plurality of LED indicating lamps are connected in parallel and then connected with the tail end of the probe of the relay socket; a pin of the key switch is connected with the probe tail end of the relay socket and the DB9 test plug, the probe tail end of the relay socket is connected with the DB9 test plug, and the key switch, the probe tail end of the relay socket and the DB9 test plug form a contact cleaning switching loop. The problems that in the testing process of onboard relays with multiple models and multiple pins, no compatible relay testing socket exists, the on-off state of contacts is not easy to observe, and a contact cleaning process tool is not universal are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of relay testing, and particularly relates to an on-board relay testing device. Background Art

[0002] An on-board relay is a low-height and small-sized relay product for printed circuit boards in the signal system of the rail transit industry. This product has a forced guiding function and is mainly applied to PCB printed circuit boards with safety circuits. During testing, the relay is mainly actuated by supplying power to the coil, and then a series of relay electrical parameter indicators such as the on-off state of the contacts, contact resistance, operating value, and release value are tested. During the product testing process of the on-board relay, due to the compact structure of the on-board relay, the sizes of its moving and static contacts are small, and it is not easy to distinguish the on state of the relay contacts. The operator cannot accurately measure mechanical characteristics such as contact pressure and flatness based on the on-off state of the contacts, resulting in the inability to ensure product consistency and affecting product quality. At the same time, the on-board relay has multiple models, and their pin configurations are also different. There is no test socket that can be compatible with all models of relays.

[0003] Since the on-off positions of the contacts of different models of on-board relays are different, it is necessary to switch different types of circuit toolings during the contact cleaning process of the relay, which affects the production efficiency of the product. Summary of the Utility Model

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides an on-board relay testing device, the purpose of which is to solve the problems of the lack of a compatible relay test socket, the difficult observation of the on-off state of the contacts, and the non-universal tooling for the contact cleaning process during the testing of on-board relays with multiple models and multiple pin configurations.

[0005] In order to achieve the above purpose, the main technical solutions adopted by the utility model include:

[0006] An on-board relay testing device includes a DB9 test plug, a key switch, a test switch, a power switch, a relay socket, and an LED indicator light. The probe end of the relay socket is connected to the test switch, and the test switch is connected to the coil power supply port to form a relay coil power supply circuit. The LED indicator light is connected to the battery module through the power switch, and several LED indicator lights are connected in parallel and then connected to the probe end of the relay socket to form a contact on-state indicator circuit. The pins of the key switch are connected to the probe end of the relay socket, the pins of the key switch are connected to the probe end of the relay socket and the DB9 test plug, the probe end of the relay socket is connected to the DB9 test plug, and the key switch, the probe end of the relay socket, and the DB9 test plug form a contact cleaning switching circuit.

[0007] Further, the probe arrangement of the relay socket is such that there are two horizontal rows of probes for powering the relay coil above. The first row of probes is horizontally arranged, and its spacing matches six groups of on-board contact relays. The second row of probes is vertically arranged, and its spacing matches four groups of on-board contact relays. Below, there are two columns of probes as the test ends of the relay contact on-off pins. The first column of probes is horizontally arranged, and the second column of probes is vertically arranged. The first four rows of the two columns of probes below are the common probes for testing six groups of contact relays and four groups of contact relays.

[0008] Further, the relay socket includes a panel, a base, a fixing frame, and probes. The probes penetrate the panel and are inserted into the base. The fixing frame is fixedly arranged above and below the panel and the base. A limiting frame for separating the longitudinal intervals of the probes is provided between the panel and the base. The limiting frame is provided with probe separation grooves, and a pair of horizontal probes are placed in one probe separation groove.

[0009] Further, the on-board relay testing device further includes an upper cover plate, a lower cover plate, a left side plate, and a right side plate that are connected to form a box structure. Inside the box structure, there are a relay socket, a DB9 test plug, a key switch, a test switch, a power switch, a relay socket, an LED indicator light, and a battery module. A plurality of through holes are opened on the front surface of the upper cover plate to expose the working surfaces of the relay socket, the key switch, the test switch, the relay socket, and the LED indicator light. Through holes for exposing the working surfaces of the DB9 test plug and the power switch and a coil power supply port are opened on the side surface of the upper cover plate.

[0010] The beneficial effects of the present utility model are as follows:

[0011] 1. The compatible relay socket of the present utility model realizes full coverage of the pin configurations of various models of relays through horizontally and vertically arranged probes, is compatible with various models of relays, avoids replacing the test socket during the testing of different models of relays, and at the same time, the socket can measure the contact resistance of the contacts by the four-wire method;

[0012] 2. The contact cleaning switching circuit of the present utility model utilizes multiple normally open and normally closed switch positions of the key switch and the mechanical structure of interlocking between the switches to realize the circuit switching and interlocking of various NONC contact relays. When cleaning the contacts of a certain model of relay, other circuits are in the off position to protect the circuit and the relay, avoiding replacing the test tooling during the contact cleaning of different models of relays;

[0013] 3. The utility model adopts a passive contact connection status indicator circuit, which displays the connection status of the relay contacts through the lighting and extinguishing of the LED lights, can avoid the deviation when visually inspecting the contact status, improve the consistency of the product and reduce the rejection rate. At the same time, the circuit adopts a 18650 lithium battery module and is configured with charging protection and no-load delay power-off functions, realizing green energy-saving testing and the flexibility of relay testing;

[0014] 4. The power supply port of the relay coil of the utility model is a universal quick plug interface, which can be compatible with external power supplies of different models to supply power to relays with different coil voltage levels, further improving the versatility of the tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view structural schematic diagram of the on-board relay testing device of the utility model;

[0016] Figure 2 is a top view structural schematic diagram of the on-board relay testing device of the utility model;

[0017] Figure 3 is a schematic diagram of the internal structure of the key side;

[0018] Figure 4 is a schematic diagram of the internal structure of the power supply module side of the key;

[0019] Figure 5 is an exploded view of the on-board relay testing device of the utility model;

[0020] Figure 6 is a structural schematic diagram of the compatible relay socket of the utility model;

[0021] Figure 7 is an exploded view of the compatible relay socket of the utility model;

[0022] Figure 8 is a circuit diagram of the contact connection status indicator light of the utility model;

[0023] Figure 9 is a circuit diagram of the contact cleaning switching of the utility model.

[0024] In the figure: 1. DB9 test plug; 2. Key switch; 3. Test switch; 4. Power switch; 5. Relay socket; 6. LED indicator light; 7. Coil power supply port; 8. Lithium battery module; 9. Upper cover plate; 10. Left side plate; 11. Lower cover plate; 12. Right side plate; 13. Panel; 14. Limit frame; 15. Fixed frame; 16. Probe; 17. Base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to better explain the present utility model for easy understanding, the present utility model will be described in detail below in conjunction with the drawings and through specific embodiments.

[0026] The present utility model provides a board-mounted relay test device, including a cleaning switching circuit and a contact connection status indicator circuit. The contact cleaning switching circuit is designed based on the contact on-off configuration of different models of board-mounted relays, using the multiple normally open and normally closed positions of a key switch and the mechanical interlock function between each group of switches. The contact connection status indicator circuit displays the on-off status of the relay contacts through the lighting and extinguishing of an LED lamp, which can avoid deviations during visual inspection of the contact connection status. This circuit uses a 18650 lithium battery module to supply power inside the device, achieving the flexibility and convenience of the test device. The board-mounted relay test device includes a DB9 test plug 1, a key switch 2, a test switch 3, a power switch 4, a relay socket 5, and an LED indicator 6. As Figure 8 shown, the probe tail end of the relay socket 5 is connected to the test switch 3, the test switch 3 is connected to the coil power supply port 7, the LED indicator 6 is connected to the battery module 8 through the power switch 4, and several LED indicators 6 are connected in parallel and then connected to the probe tail end of the relay socket 5 to form a loop, that is, the contact connection status indicator circuit. Specifically, the battery module 8 uses a 18650 lithium battery module. Its coil power supply port 7 supplies power to the coil of the relay under test through a wire connecting the test switch 3 and the probe tail end of the relay socket 5. Triggering the test switch 3 controls the operation of the relay under test to change the contact connection status, and it is fixed on the upper cover 9 of the aluminum alloy housing using a nut; its 18650 lithium battery module supplies power to the LED indicator 6 through a wire connecting the power switch 4 and is fixed on the upper part of the lower cover 11 of the aluminum alloy housing using a screw; its LED indicator 6 is connected to the probe tail end of the relay socket 5 through a wire to form a contact connection status display loop and is fixed on the upper cover 9 of the aluminum alloy housing using a nut.

[0027] As Figure 9 shown, the pins of the key switch 2 are connected to the probe tail end of the relay socket 5, the probe tail end of the relay socket 5 is connected to the DB9 test plug 1, and the key switch 2, the probe tail end of the relay socket 5, and the DB9 test plug 1 form a loop, that is, the contact cleaning switching circuit. The key switch 2 is composed of five groups of switches, and each group of switches is composed of 18 pins, with every three pins forming a normally open and normally closed combination. When any one group of switches is pressed, the remaining switches will be reset through a mechanical structure to form a mechanical interlock. Connect the pins of the key switch to the respective probe tail ends of the relay socket 5 and the DB9 test plug 1 through wires. During use, connect the serial port cable of the contact cleaning machine to the DB9 test plug 1 of the device, and fix the key switch 2 and the DB9 test plug 1 on the upper cover 9 of the aluminum alloy housing using screws.

[0028] In order to adapt to on-board relays of multiple models, the on-board relay socket 5 of the present utility model is set as a compatible relay socket. For example, Figures 6 - 7 As shown, specifically, the probe setting method of the relay socket 5 is that there are two rows of probes arranged vertically above for the power supply position of the relay coil. The first row of probes is arranged horizontally, that is, the clip gaps of the probes are arranged horizontally. The center distance between the two probes in the first row is 12.6 mm. This coil power supply position can supply power to the on-board relay with six sets of contacts and is suitable for the on-board relay with 6 sets of contacts. The probes at the second row of coil power supply positions are arranged vertically, that is, the clip gaps of the probes are arranged vertically. The center distance between the two probes in the second row is 7.6 mm. This coil power supply position can supply power to the on-board relay with four sets of contacts and is suitable for the on-board relay with 4 sets of contacts. Two columns of probes are arranged below as the test ends of the on-off pins of the relay contacts. The first column is arranged horizontally, that is, the clip gaps of the probes are arranged horizontally; the second column is arranged vertically, that is, the clip gaps of the probes are arranged vertically. The center distance between the two columns is 9 mm. Among them, the vertically arranged probes can cover the situation where the pin pitches of special model relays are inconsistent and left-right asymmetric; the first four rows of the two columns of probes arranged below are the common probes for testing the six-set contact relay and the four-set contact relay. Through this horizontal and vertical arrangement method and the dimensional relationship between the probes, the compatibility of the test socket is realized. At the same time, this socket can measure the contact resistance of the contacts by the four-wire method. The compatible relay socket 5 is designed by matching the pin distribution characteristics of the relay and using horizontally and vertically arranged probes to cover the dimensional deviations of the pin arrangements of multiple models of relays. It is connected to the contact cleaning switching circuit and the contact on-state indicator circuit to avoid replacing different sockets when testing different models of relays and realize the versatility of the device.

[0029] The relay socket 5 includes a panel 13, a base 17, a fixing frame 15, and probes 16. The probes 16 penetrate through the panel 13 and are inserted into the base 17. The fixing frame 15 is fixedly arranged above and below the panel 13 and the base 17. A limiting frame 14 for separating the longitudinal intervals of the probes is arranged between the panel 13 and the base 17. The limiting frame 14 is provided with probe separation grooves. A pair of horizontally arranged probes are placed in one probe separation groove. The limiting frame 14 is made of POM material, which plays a role of physical insulation to prevent the gaps between adjacent rows of probes from being broken down during testing. The probes are inserted according to the counterbores arranged in the base, inserted horizontally into the limiting frame 14, then the panel 13 is fixed to the base 17 with screws, and finally the fixing frame 15 is inserted into the mounting holes on both sides of the base 17 and fixed to the upper cover plate 9 of the aluminum alloy housing with screws.

[0030] The on-board relay test device of the present utility model also has the characteristic of being portable. Specifically, for example, Figures 1 - 5As shown in the figure, the on-board relay test device further includes an upper cover plate 9, a lower cover plate 11, a left side plate 10, and a right side plate 12 that are connected to each other to form a box structure. A relay socket 5, a DB9 test plug 1, a key switch 2, a test switch 3, a power switch 4, a relay socket 5, an LED indicator 6, and a battery module 8 are fixedly installed inside the box structure. A plurality of through holes are provided on the front surface of the upper cover plate 9 to expose the working surfaces of the relay socket 5, the key switch 2, the test switch 3, the relay socket 5, and the LED indicator 6. Through holes for exposing the working surfaces of the DB9 test plug 1 and the power switch 4 and a coil power supply port 7 are provided on the side surface of the upper cover plate 9 for easy operation.

[0031] The usage method of the test device of the present utility model includes Function 1: Display of the on-off state of the contact points:

[0032] Step 1: Insert an external power supply into the coil power supply port, and insert the relay to be tested into the compatible relay socket.

[0033] Step 2: Press the power switch to turn on the power of the LED indicator. Trigger the test switch to change the on-off state of the relay for testing. At this time, the LED indicator will display according to the on-off state of the contact points, and the operator can make corresponding relay adjustments and tests according to the on-off state of the contact points.

[0034] Function 2: Switching of the contact cleaning circuit:

[0035] Step 1: Press the power switch to turn off the power of the LED indicator, and insert the test serial cable of the contact cleaner into the DB9 test plug.

[0036] Step 2: Press the key position of the corresponding key switch according to the relay model.

[0037] Step 3: Click the start button of the contact cleaner, and at this time, the contact cleaning of the relay will start according to the set program.

[0038] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Any modifications, alterations, substitutions, and variations made by those of ordinary skill in the art to the above embodiments fall within the scope of the present utility model.

Claims

1. An on-board relay test device, characterized in that: It includes a DB9 test plug (1), a key switch (2), a test switch (3), a power switch (4), a relay socket (5), and an LED indicator light (6). The probe tail end of the relay socket (5) is connected to the test switch (3), and the test switch (3) is connected to the coil power supply port (7) to form a relay coil power supply loop. The LED indicator light (6) is connected to the battery module (8) through the power switch (4). A plurality of LED indicator lights (6) are connected in parallel and then connected to the probe tail end of the relay socket (5) to form a contact connection status indicator loop; the pins of the key switch (2) are connected to the probe tail end of the relay socket (5), the pins of the key switch (2) are connected to the probe tail end of the relay socket (5), the DB9 test plug (1), the probe tail end of the relay socket (5) is connected to the DB9 test plug (1), and the key switch (2), the probe tail end of the relay socket (5), and the DB9 test plug (1) form a contact cleaning switching loop.

2. The on-board relay test device according to claim 1, wherein: The probe setting method of the relay socket (5) is that there are two upper and lower rows of probes for relay coil power supply arranged above. The first row of probes is arranged horizontally, and its spacing matches six groups of contact board-mounted relays. The second row of probes is arranged vertically, and its spacing matches four groups of contact board-mounted relays; there are two columns of probes arranged below as the test ends of the relay contact on-off pins. The first column of probes is arranged horizontally, and the second column of probes is arranged vertically. The first four rows of the two columns of probes arranged below are the common probes for testing six groups of contact relays and four groups of contact relays.

3. The on-board relay test device according to claim 2, characterized in that: The relay socket (5) includes a panel (13), a base (17), a fixing frame (15), and probes (16). The probes (16) penetrate the panel (13) and are inserted into the base (17). The fixing frame (15) is fixedly arranged above and below the panel (13) and the base (17). A limiting frame (14) for separating the longitudinal interval of the probes is arranged between the panel (13) and the base (17). The limiting frame (14) is provided with probe separation grooves, and a pair of horizontal probes are placed in one probe separation groove.

4. The on-board relay testing device according to claim 1, characterized in that: The board-mounted relay test device further includes an upper cover plate (9), a lower cover plate (11), a left side plate (10), and a right side plate (12) that are connected to each other to form a box structure. A relay socket (5), a DB9 test plug (1), a key switch (2), a test switch (3), a power switch (4), a relay socket (5), an LED indicator light (6), and a battery module (8) are arranged inside the box structure. A plurality of through holes for exposing the working surfaces of the relay socket (5), the key switch (2), the test switch (3), the relay socket (5), and the LED indicator light (6) are opened on the front surface of the upper cover plate (9). Through holes for exposing the working surfaces of the DB9 test plug (1), the power switch (4), and the coil power supply port (7) are opened on the side surface of the upper cover plate (9).

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