Grounding relay test device for locomotive DC / AC power grid

Abstract

The invention relates to the technical field of locomotive equipment test, and discloses a grounding relay test device for a locomotive direct current and alternating current power grid, which comprises a shell and a hand push frame arranged on the shell, the carrier plate is arranged at the bottom of the hand-push frame; the probe assemblies are arranged on the carrier plate at equal intervals and are used for testing; the pressure equalizing assembly is arranged on the carrier plate and is used for keeping the pressure borne by each probe assembly consistent; the pressure equalizing assembly comprises a sleeve which is arranged outside the probe assembly in a sleeving manner; and the fixing assembly is used for connecting and fixing the carrier plate and the sleeve. During use, when the heights of the contacts of the to-be-tested equipment are different, the compression degrees of the probe heads can be consistent, and the situation that the abrasion degrees of the probe heads are inconsistent due to the fact that the compression degrees of the probe heads are inconsistent is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of locomotive equipment testing, and in particular relates to a grounding relay testing device for a locomotive DC / AC power grid. Background Art

[0002] The grid insulation monitoring device (grounding relay test device) is an indispensable monitoring device for the current Harmony locomotive. The main grid insulation monitoring devices currently used are divided into 110V DC grid insulation monitoring device, 220V AC grid insulation monitoring device, and 440V AC grid insulation monitoring device.

[0003] When testing the equipment, the manual push frame is used to move the carrier plate and the probes below to contact the various contacts on the equipment, and then the test is carried out. Since the contacts on the equipment are at different heights during the actual test, when the carrier plate and the probes descend, some probes will first contact the contacts at a higher position. Then the carrier plate continues to move and the remaining probes descend, and the subsequent probes will contact the subsequent contacts. In this process, the pressure on the probes that contact the contacts first and the probes that contact the contacts later will be different. The different pressures on the probes will cause different degrees of wear on each probe over time, affecting their use. In addition, we usually complete the test of the equipment after maintenance by setting up a simple power supply and grounding circuit and a multimeter. This test usually requires the tester to be familiar with the test circuit and the parameters of the grounding circuit. The grounding test of each channel and line needs to be rewired, the steps are cumbersome, and the grounding test accuracy is not high. There are also certain safety risks in the experiment. For example, the AC power supply can be connected to the DC power supply, causing a short circuit and burning out the grid insulation monitoring device.

[0004] Therefore, it is necessary to invent a grounding relay test device for locomotive DC and AC power grids to solve the above problems. Summary of the Invention

[0005] In view of the above problems, the present invention provides a grounding relay test device for a locomotive DC / AC power grid to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a grounding relay test device for a locomotive DC / AC power grid, comprising a housing, a push frame disposed on the housing, a carrier plate disposed at the bottom of the push frame, probe assemblies equidistantly disposed on the carrier plate for conducting a test, and a pressure equalizing assembly disposed on the carrier plate for maintaining a consistent pressure on each of the probe assemblies.

[0007] The pressure equalizing component includes:

[0008] A sleeve, sleeved on the outside of the probe assembly;

[0009] A fixing assembly, used for connecting and fixing the carrier plate and the sleeve;

[0010] The control component is used to cancel the connection and fixation between the carrier plate and the sleeve by the fixing component and fix the sleeve when the pressure of the probe component reaches a set value.

[0011] Furthermore, the probe assembly includes:

[0012] A probe housing is fixedly mounted inside the sleeve;

[0013] a first spring disposed inside the probe housing;

[0014] The probe head is slidably arranged inside the probe shell.

[0015] Furthermore, the fixing assembly includes:

[0016] A clamping plate, slidably disposed inside the carrier plate, for clamping and fixing the sleeve;

[0017] a magnetic block, arranged on a side of the clamping plate away from the sleeve;

[0018] a first electromagnet disposed inside the carrier plate, wherein the magnetic block is located between the first electromagnet and the clamping plate;

[0019] A second spring is provided on a side of the clamping plate close to the sleeve and is used for driving the clamping plate to reset.

[0020] Furthermore, the control component includes:

[0021] A switch is provided on the outside of the probe housing, wherein the switch is a push switch, and the button of the switch extends into the interior of the probe housing;

[0022] a positioning frame, one end of which is connected to the sleeve;

[0023] a second electromagnet connected to the other end of the positioning frame;

[0024] a cylindrical shell, sleeved on the outside of the second electromagnet, wherein the cylindrical shell is made of iron;

[0025] A connecting plate is installed on the outside of the shell, and the cylindrical shell is connected to the bottom of the connecting plate;

[0026] The controller is used to control the power on and power off of the first electromagnet and the second electromagnet.

[0027] Furthermore, the outside of the sleeve is provided with a dustproof component for preventing dust and impurities from adhering to its surface;

[0028] The dustproof component includes:

[0029] a lower ring plate connected to the bottom of the carrier plate;

[0030] an upper ring plate connected to the top of the sleeve;

[0031] The shielding sleeve connects the lower ring plate to the sleeve and the upper ring plate to the carrier plate.

[0032] Furthermore, the shielding sleeve is specifically configured as a telescopic sleeve.

[0033] Furthermore, a vertical plate is provided on the shell, and a DC voltmeter and an AC voltmeter are respectively provided on the vertical plate.

[0034] Furthermore, the housing is provided with a control panel that cooperates with the probe head for conducting tests.

[0035] Furthermore, the positioning frame is made of plastic and has an L-shape.

[0036] Furthermore, the inner cavity of the cylindrical shell is rectangular in shape, the shape of the second electromagnet matches the inner cavity of the cylindrical shell, and the second electromagnet contacts the inner cavity wall of the cylindrical shell.

[0037] Technical effects and advantages of the present invention:

[0038] When the present invention is in use, when the heights of the contacts of the device to be tested are different, the pressure levels of the probe heads can be made consistent, thereby avoiding the situation where the wear levels of the probe heads are inconsistent due to the inconsistent pressure levels of the probe heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic structural diagram of a test device for a grounding relay for a locomotive DC / AC power grid according to an embodiment of the present invention is shown;

[0040] Figure 2 The cross-sectional structure diagram of the carrier board of the embodiment of the present invention is shown. Figure 1 ;

[0041] Figure 3 The embodiment of the present invention is shown Figure 2 A in the middle is an enlarged structural diagram;

[0042] Figure 4 The cross-sectional structure diagram of the carrier board of the embodiment of the present invention is shown. Figure 2 ;

[0043] Figure 5 The embodiment of the present invention is shown Figure 4 The enlarged structural diagram at B in the middle;

[0044] Figure 6 A test circuit diagram of an embodiment of the present invention is shown.

[0045] In the figure: 1. Shell; 2. Hand push frame; 3. Carrying plate; 4. Sleeve; 5. Probe shell; 6. First spring; 7. Probe head; 8. Clamp; 9. Magnetic block; 10. First electromagnet; 11. Second spring; 12. Switch; 13. Positioning frame; 14. Second electromagnet; 15. Cylinder shell; 16. Connecting plate; 17. Lower ring plate; 18. Upper ring plate; 19. Shielding sleeve; 20. Alarm indicator light; 21. Simulated grounding adjustable resistance knob; 22. DC and AC conversion switch; 23. Grounding point test switch; 24. L1 disconnection test switch; 25. L2 disconnection test switch; 26. 220V relay test button; 27. 110V relay test; 28. Vertical plate. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0047] The present invention provides a grounding relay test device for locomotive DC and AC power grids, such as Figures 1 to 5 As shown, it includes a housing 1, a hand push frame 2, a carrier plate 3, a probe assembly, and a pressure equalizing assembly; the hand push frame 2 is arranged on the housing 1, and the hand push frame 2 is a hand push frame on the PCBA voltage and current function test fixture in the prior art. The carrier plate 3 is symmetrically fixedly mounted on the bottom of the hand push frame 2, and the probe assemblies are equidistantly arranged on the carrier plate 3 for testing; the pressure equalizing assembly is arranged on the carrier plate 3 to keep the pressure on each probe assembly consistent;

[0048] The pressure equalizing assembly includes: a sleeve 4, a fixing assembly, and a control assembly;

[0049] The sleeve 4 is fixedly mounted on the outside of the probe assembly, and a sliding hole matching the sleeve 4 is opened on the carrier plate 3. The sleeve 4 is arranged in the sliding hole. The fixing assembly is used to connect and fix the carrier plate 3 and the sleeve 4. The control assembly is used to cancel the connection and fixation between the carrier plate 3 and the sleeve 4 by the fixing assembly and to fix the sleeve 4 when the pressure of the probe assembly reaches a set value.

[0050] When in use, the device to be tested is placed on the top of the shell 1, and then the hand push frame 2 is pulled to lower the carrier plate 3, thereby lowering the probe assembly, so that the probe assembly conflicts with the contact of the device to be tested. As the carrier plate 3 descends, pressure is continuously applied to the probe assembly. When the pressure reaches the set value, the control component controls the fixing component to cancel the connection and fixation between the carrier plate 3 and the sleeve 4, and then fixes the position of the sleeve 4 so that the sleeve 4 cannot move, so that when the subsequent carrier plate 3 descends, it will not continue to bring the sleeve 4 down. Therefore, the position of the probe assembly does not move, and the probe assembly is fixed by the applied pressure. The subsequent principle is the same as above. As the carrier plate 3 descends, when the subsequent probe assembly conflicts with the subsequent contact, when the pressure reaches the set value, the sleeve 4 connected to the probe assembly can be fixed, and the fixation of the connecting sleeve 4 and the fixing component can be cancelled. Finally, the positions of the sleeves 4 connected to all the probe assemblies are fixed, and the pressure conditions of the probe assemblies are consistent.

[0051] Since the contacts on the device are at different heights during actual testing, when the carrier plate 3 descends with the probe assemblies, some of the probe assemblies will first collide with the contacts at higher positions, and then the carrier plate 3 continues to move and descends with the remaining probe assemblies, and the subsequent probe assemblies will contact the subsequent contacts. In this process, the probe assemblies that first contact the contacts and the probe assemblies that contact the contacts later will be subjected to different pressures. The different pressures on the probe assemblies will cause different degrees of wear on the probe assemblies in the long run, affecting their use. Through the above operation, the pressures on the various probe assemblies can be made consistent, avoiding the situation where the wear on the various probe assemblies is different.

[0052] like Figures 2 to 3 As shown, the probe assembly includes: a probe housing 5, a first spring 6, and a probe head 7;

[0053] The probe housing 5 is fixedly mounted inside the sleeve 4 , the first spring 6 is disposed inside the probe housing 5 , the probe head 7 is slidably disposed inside the probe housing 5 , and a transmission line is connected to the probe head 7 , which extends to the outside of the probe housing 5 .

[0054] The sleeve 4 descends with the probe shell 5 and the probe head 7. After the probe head 7 contacts the contact, it stops moving. As the sleeve 4 continues to descend, the probe shell 5 also descends. At this time, the first spring 6 is compressed. The compressed first spring 6 provides pressure to the probe head 7, so that the probe head 7 can be in stable and full contact with the contact.

[0055] like Figures 3 to 5 As shown, the fixing assembly includes: a clamping plate 8, a magnetic block 9, a first electromagnet 10, and a second spring 11;

[0056] The two ends of the second spring 11 are respectively fixedly connected to the side of the splint 8 close to the sleeve 4 and the inner wall of the movable groove. The magnetic force generated when the first electromagnet 10 is energized is sufficient to overcome the elastic force of the second spring 11 to repel the splint 8 to move in the direction close to the sleeve 4 and to conflict with the surface of the sleeve 4.

[0057] like Figure 2 and Figure 3 As shown, the control assembly includes: a switch 12, a positioning frame 13, a second electromagnet 14, a cylinder shell 15, a connecting plate 16, and a controller;

[0058] The switch 12 is arranged on the outside of the probe shell 5. The switch 12 is a push switch. The button of the switch 12 extends to the inside of the probe shell 5. The button end of the switch 12 is provided with an arc surface. One end of the positioning frame 13 is fixedly connected to the sleeve 4. The second electromagnet 14 is fixedly connected to the other end of the positioning frame 13. The cylinder shell 15 is sleeved on the outside of the second electromagnet 14. The material of the cylinder shell 15 is iron. The connecting plate 16 is fixedly installed on the outside of the shell 1. The cylinder shell 15 is fixedly connected to the bottom of the connecting plate 16. The controller is not shown in the figure and is used to control the power on and off of the first electromagnet 10 and the second electromagnet 14.

[0059] When in use, the controller controls the first electromagnet 10 to be energized to make it magnetic. The first electromagnet 10 repels the magnetic block 9 so that it moves with the splint 8 and the rubber pad in the direction close to the sleeve 4. Finally, the splint 8 cooperates with the rubber pad and the inner wall of the sliding hole to clamp and fix the sleeve 4. The carrier plate 3 descends so that the clamped sleeve 4 moves accordingly, thereby carrying the probe shell 5 and the probe head 7 to move accordingly. The probe head 7 cannot continue to move after it conflicts with the contact. As the carrier plate 3 continues to descend, the probe shell 5 descends to compress the first spring 6. At this time, the probe head 7 and the probe shell 5 move relative to each other, and the probe head 7 subsequently conflicts with the button of the switch 12, and cooperates with the arc surface to squeeze the button of the switch 12. At this time, the switch 12 controls the first electromagnet 10 to be de-energized, so that it loses its magnetism. The second spring 11 resets and brings the splint 8 back to reset, thereby canceling the clamping and fixation of the sleeve 4. As the cylinder 4 descends, the positioning frame 13 and the second electromagnet 14 descend with it. When the switch 12 is pressed, the switch 12 controls the second electromagnet 14 to be energized to make it magnetic, so that the second electromagnet 14 is adsorbed and fixed on the inner wall of the cylinder shell 15. At this time, the positioning frame 13, the sleeve 4 and the probe shell 5 cannot move, so the first spring 6 remains in a compressed state, and the pressure on the probe head 7 is constant at this time. Subsequently, when the carrier plate 3 continues to descend, the sleeve 4 separated from the clamping plate 8 remains stationary and does not descend with the carrier plate 3. The subsequent steps are the same as above. Finally, when each switch 12 is pressed, the sleeve 4 and the clamping plate 8 installed on the carrier plate 3 can be separated, and the position of the sleeve 4 can be fixed. Since they are all triggered when the probe head 7 presses the button 12, the compression degree of each first spring 6 is consistent, so that the pressure conditions of each probe head 7 are consistent;

[0060] After the test is completed, the second electromagnet 14 is powered off to make it lose its magnetism, and the compressed first spring 6 releases its force to carry the probe shell 5, the positioning frame 13, and the second electromagnet 14 upward. Finally, the first spring 6 returns to its initial state, and then drives the carrier plate 3 to rise. After the carrier plate 3 collides with the positioning frame 13, it carries the positioning frame 13, the sleeve 4, the probe shell 5, the probe head 7, and the second electromagnet 14 to reset.

[0061] Due to long-term use, dust and impurities are attached to the sleeve 4 in large quantities, which affects the stability of the clamping plate 8 and the rubber pad in clamping the sleeve 4. As a result, when the carrier plate 3 and the clamping plate 8 clamp the sleeve 4 and drop, and force is applied to the probe head 7, there will be a slip between the clamping plate 8 and the sleeve 4, affecting normal use. In order to avoid the above situation, as Figures 2 to 3 As shown, the outside of the sleeve 4 is provided with a dustproof component for preventing dust and impurities from adhering to its surface;

[0062] The dustproof assembly includes: a lower ring plate 17, an upper ring plate 18, and a shielding sleeve 19;

[0063] The lower ring plate 17 is fixedly connected to the bottom of the carrier plate 3, the upper ring plate 18 is fixedly connected to the top of the sleeve 4, and the shielding sleeve 19 connects the lower ring plate 17 to the sleeve 4 and the upper ring plate 18 to the carrier plate 3 respectively.

[0064] When the position of the sleeve 4 is fixed, the carrier plate 3 descends, bringing the lower ring plate 17 with it, pulling the lower shielding sleeve 19 to unfold. At the same time, the upper shielding sleeve 19 is also unfolded as the carrier plate 3 descends. Finally, the unfolded shielding sleeve 19 can be wrapped by the sleeve 4 to prevent dust and impurities from adhering to the surface of the sleeve 4 and the above-mentioned slipping. When the carrier plate 3 rises, on the contrary, the shielding sleeve 19 is retracted.

[0065] like Figure 3 As shown, the shielding sleeve 19 is specifically configured as a telescopic sleeve.

[0066] like Figure 1 As shown, a vertical plate 28 is provided on the housing 1, and a 110V DC voltmeter and a 220V AC voltmeter are respectively provided on the vertical plate 28. A control panel for cooperating with the probe head 7 for conducting tests is provided on the housing 1.

[0067] After the probe head 7 contacts the contact, it can perform testing in conjunction with the test circuit set inside the housing 1;

[0068] The surface of the shell 1 is provided with a control panel that cooperates with the test circuit. The control panel includes: an alarm indicator light 20, an analog grounding adjustable resistance knob 21, a DC and AC conversion switch 22, a grounding point test switch 23, an L1 disconnection test switch 24, an L2 disconnection test switch 25, a 220v relay test button 26, a 110v relay test 27, and a boat-shaped three-speed switch.

[0069] Different models of power grid insulation monitoring devices can be selected using a three-speed ship-shaped switch, and the corresponding test button must be selected to complete the test, reducing misoperation when testing different models. The insulation values ​​of L1 and L2 can be tested back and forth without switching circuits, and all alarm values ​​can be tested. It also integrates line break protection, grounding alarm, and alarm channel testing.

[0070] (1) Test circuit

[0071] The 220V mains power input passes through a fuse and is connected to a 220V AC voltmeter (to observe the power input), a 220V to 110V switching power supply (to provide DC power), and points 8 and 5 of the KA2 relay.

[0072] The 110V DC output of the switching power supply is connected to a DC voltmeter. 110V+ is connected to KA1 relay 8 points, and 110V- is connected to KA1 relay 5 points. A1 is 110V+ and A2 is 110V-.

[0073] The 12 points of KA1 and KA2 are connected to the 4 points of KA3 relay.

[0074] Point 5 of KA1 and KA2 is connected to point 5 of KA4 relay.

[0075] Point 12 of KA3 is connected to the R1 adjustable resistor (the other end is grounded) and L1 (test point 1 of the power grid detection device line).

[0076] Point 12 of KA4 is connected to the R2 adjustable resistor (the other end is grounded) and L2 (test point 2 of the power grid detection device line).

[0077] When the KA1 relay is closed, the DC grid is tested. At this time, L1 is the positive terminal and L2 is the negative terminal.

[0078] When the KA2 relay is closed, it is the AC power grid test. At this time, L1 is AC 1 and L2 is AC 2.

[0079] When KA3 relay is disconnected, L1 will maintain the existing insulation value. 10 minutes after disconnection, the grid test device displays "E-----".

[0080] When KA4 relay is disconnected, L2 will maintain the existing insulation value. 10 minutes after disconnection, the grid test device displays "E-----".

[0081] The adjustable resistors R1 and R2 are 500K ohm resistors and can be adjusted from 500K ohm to 0 ohm.

[0082] The DC grid insulation device displays OL when the insulation is above 200K ohms, and displays the specific numerical insulation value below 200K ohms. When the alarm value is reached, the two alarm indicators of the DC grid insulation device light up, and the two indicators of the alarm channel displayed by the tester also light up.

[0083] When the insulation value of the AC grid insulation device is above 500K ohms, OL is displayed; when it is below 500K ohms, the specific numerical insulation value is displayed. At the same time, one alarm indicator light of the AC grid insulation device is on, and one indicator light of the alarm channel displayed by the tester is also on. When the insulation value is below 200K ohms, two alarm indicators of the AC grid insulation device are on, and two indicator lights of the alarm channel displayed by the tester are also on.

[0084] (2) Switching circuit

[0085] A1 is connected to the rocker switch, SB3, and SB4.

[0086] Connect the rocker switch to SB1 in gear I. SB1 controls the KA1 coil to connect to the DC grid insulation device for testing.

[0087] The II gear is connected to SB2, and SB2 controls the KA2 coil to connect to the AC grid insulation device test;

[0088] Connect SB3 to KA3 coil and disconnect L1 line for testing; connect SB4 to KA4 coil and disconnect L2 line for testing;

[0089] The negative terminals of KA1, KA2, KA3, and KA4 relays are connected back to A2.

[0090] (3) Probe test circuit

[0091] L1 and L2 are insulation test lines, DOO and DO1 are comparison grounding points of the grid insulation monitoring device, and are connected to the SB5 normally closed point for grounding point disconnection detection. After disconnection, the grid insulation monitoring device displays OL (no ground comparison display is normal)

[0092] A1 is 110V+, and A2 is 110V-. They provide working power for the grid insulation monitoring device.

[0093] The power grid insulation monitoring devices 11 and 14 form a normally open channel. When the insulation value falls below the alarm value, the power grid insulation monitoring device's own alarm light will illuminate. At this time, the channel is closed. The indicator light connected in series after 14 o'clock also lights up simultaneously.

[0094] Similarly, the grid insulation monitoring devices 21 and 24 form a normally open channel. When the insulation value falls below the alarm value, the grid insulation monitoring device's own alarm light will illuminate. At this time, the channel is closed. The indicator light connected in series after 24 o'clock also lights up simultaneously.

[0095] This device is compatible with various types of grounding relay testers, which can greatly improve test efficiency, accuracy, and safety. It is easy to operate, reduces safety risks caused by human factors, and improves the accuracy of tests.

[0096] like Figure 2 As shown, the material of the positioning frame 13 is plastic, and the shape of the positioning frame 13 is L-shaped.

[0097] like Figure 2 As shown, the inner cavity of the cylindrical shell 15 is rectangular in shape, the shape of the second electromagnet 14 matches the inner cavity shape of the cylindrical shell 15 , and the second electromagnet 14 contacts the inner cavity wall of the cylindrical shell 15 .

[0098] The second electromagnet 14 can be adsorbed and fixed on the inner wall of the cylinder shell 15 after being energized.

[0099] Working principle: When in use, the controller controls the first electromagnet 10 to be energized to make it magnetic. The first electromagnet 10 repels the magnetic block 9 and makes it move with the clamping plate 8 and the rubber pad toward the direction close to the sleeve 4. Finally, the clamping plate 8 cooperates with the rubber pad and the inner wall of the sliding hole to clamp the sleeve 4. The device to be tested is placed on the top of the shell 1. Then, the push frame 2 is pulled to lower it with the carrier plate 3. The lowering of the carrier plate 3 causes the clamped sleeve 4 to move with it, thereby moving with the probe shell 5 and the probe head 7. The probe head 7 cannot continue to move after it conflicts with the contact. As the carrier plate 3 The probe housing 5 continues to fall, causing the probe housing 5 to fall and compress the first spring 6. At this time, the probe head 7 and the probe housing 5 move relative to each other, and the probe head 7 then conflicts with the button of the switch 12, and cooperates with the arc surface to squeeze the button of the switch 12. At this time, the switch 12 controls the first electromagnet 10 to be powered off, making it lose its magnetism, and the second spring 11 resets and brings the splint 8 back to reset, thereby canceling the clamping fixation of the sleeve 4. In the process of the sleeve 4 descending, the positioning frame 13 and the second electromagnet 14 also descend. When the switch 12 is pressed, the switch 12 controls the second electromagnet 14 to be powered on. The second electromagnet 14 is magnetic, so that the second electromagnet 14 is adsorbed and fixed on the inner wall of the cylinder shell 15. At this time, the positioning frame 13, the sleeve 4, and the probe shell 5 cannot move, so the first spring 6 remains in a compressed state. At this time, the pressure on the probe head 7 is constant. Then, when the carrier plate 3 continues to descend, the sleeve 4 separated from the clamping plate 8 remains stationary and does not descend with the carrier plate 3. The subsequent steps are the same as above. Finally, when each switch 12 is pressed, the sleeve 4 can be separated from the clamping plate 8 installed on the carrier plate 3, and the position of the sleeve 4 can be fixed. Since they are all triggered when the probe head 7 presses the button 12, Therefore, the compression degree of each first spring 6 is consistent, so that the pressure conditions of each probe head 7 are consistent. After the test is completed, the second electromagnet 14 is powered off to lose its magnetism, and the compressed first spring 6 releases its force to carry the probe housing 5, the positioning frame 13, and the second electromagnet 14 up. Finally, the first spring 6 returns to its initial state, and then drives the carrier plate 3 to rise. After the carrier plate 3 contacts the positioning frame 13, it brings the positioning frame 13, the sleeve 4, the probe housing 5, the probe head 7, and the second electromagnet 14 back to their original state. During the entire test process, it can ensure that the pressure conditions of each probe head 7 are consistent;

[0100] Since the contacts on the device are at different heights during actual testing, when the carrier plate 3 descends with the probe assemblies, some of the probe assemblies will first come into contact with the contacts at higher positions. Then, the carrier plate 3 continues to move, carrying the remaining probe assemblies downward, and the subsequent probe assemblies will come into contact with the subsequent contacts. In this process, the pressures on the probe assemblies that come into contact with the contacts first and the probe assemblies that come into contact with the contacts later will be different. The different pressures on the probe assemblies will cause different degrees of wear on the probe assemblies over time, affecting their use. Through the above operation, the pressures on the probe assemblies can be made consistent, thus avoiding the situation where the wear degrees of the probe assemblies are different.

[0101] Due to long-term use, dust and impurities are adhered to the sleeve 4 in large quantities, which affects the stability of the clamping of the sleeve 4 by the splint 8 and the rubber pad. As a result, when the carrier plate 3 cooperates with the splint 8 to clamp the sleeve 4 and descends, and force is applied to the probe head 7, slippage will occur between the splint 8 and the sleeve 4, affecting normal use. In order to avoid the above situation, after the position of the sleeve 4 is fixed, the carrier plate 3 descends, and the lower ring plate 17 is brought down, so that the shielding sleeve 19 below is pulled to unfold. At the same time, the upper shielding sleeve 19 is also unfolded as the carrier plate 3 descends. Finally, the unfolded shielding sleeve 19 can be wrapped by the sleeve 4, so as to prevent dust and impurities from adhering to the surface of the sleeve 4 and avoid the above-mentioned slipping. When the carrier plate 3 rises, on the contrary, the shielding sleeve 19 is retracted.

[0102] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A grounding relay test device for a locomotive DC / AC power grid, comprising a housing (1), characterized in that: A hand push frame (2) is arranged on the housing (1); A carrier plate (3) is arranged at the bottom of the hand push frame (2); Probe assemblies, equidistantly arranged on the carrier plate (3), for conducting tests; A pressure equalizing assembly is provided on the carrier plate (3) and is used to keep the pressure on each of the probe assemblies consistent; The pressure equalizing component includes: A sleeve (4) is sleeved on the outside of the probe assembly; A fixing assembly, used for connecting and fixing the carrier plate (3) and the sleeve (4); The control component is used to cancel the connection and fixation between the carrier plate (3) and the sleeve (4) by the fixing component and to fix the sleeve (4) when the pressure of the probe component reaches a set value.

2. The grounding relay test device for locomotive DC and AC power grids according to claim 1, characterized in that: The probe assembly comprises: A probe housing (5) is fixedly mounted inside the sleeve (4); A first spring (6) is arranged inside the probe housing (5); The probe head (7) is slidably arranged inside the probe housing (5).

3. The grounding relay test device for locomotive DC and AC power grids according to claim 2, characterized in that: The fixing assembly includes: a clamping plate (8) slidably arranged inside the carrier plate (3) and used for clamping and fixing the sleeve (4); a magnetic block (9) arranged on a side of the clamping plate (8) away from the sleeve (4); A first electromagnet (10) is arranged inside the carrier plate (3), and the magnetic block (9) is located between the first electromagnet (10) and the clamping plate (8); A second spring (11) is provided on a side of the clamping plate (8) close to the sleeve (4) and is used for driving the clamping plate (8) to reset.

4. The grounding relay test device for locomotive DC and AC power grids according to claim 3, characterized in that: The control component includes: A switch (12) is provided on the outside of the probe housing (5), wherein the switch (12) is a push switch, and a button of the switch (12) extends into the interior of the probe housing (5); A positioning frame (13), one end of which is connected to the sleeve (4); a second electromagnet (14) connected to the other end of the positioning frame (13); a cylindrical shell (15) sleeved on the outside of the second electromagnet (14), wherein the cylindrical shell (15) is made of iron; A connecting plate (16) is installed on the outside of the housing (1), and the cylindrical shell (15) is connected to the bottom of the connecting plate (16); A controller is used for controlling the power on and power off of the first electromagnet (10) and the second electromagnet (14).

5. The grounding relay test device for locomotive DC and AC power grids according to claim 4, characterized in that: The outside of the sleeve (4) is provided with a dustproof component for preventing dust and impurities from adhering to the surface of the sleeve; The dustproof component includes: A lower ring plate (17) connected to the bottom of the carrier plate (3); an upper ring plate (18) connected to the top of the sleeve (4); A shielding sleeve (19) connects the lower ring plate (17) to the sleeve (4), and connects the upper ring plate (18) to the carrier plate (3).

6. The grounding relay test device for locomotive DC and AC power grids according to claim 5, characterized in that: The shielding sleeve (19) is specifically configured as a telescopic sleeve.

7. The grounding relay test device for locomotive DC and AC power grids according to claim 6, characterized in that: A vertical plate (28) is provided on the housing (1), and a DC voltmeter and an AC voltmeter are respectively provided on the vertical plate (28).

8. The grounding relay test device for locomotive DC and AC power grids according to claim 7, characterized in that: The housing (1) is provided with a control panel that cooperates with the probe head (7) for conducting tests.

9. The grounding relay test device for locomotive DC and AC power grids according to claim 8, characterized in that: The material of the positioning frame (13) is plastic, and the shape of the positioning frame (13) is L-shaped.

10. The grounding relay test device for locomotive DC and AC power grids according to claim 9, characterized in that: The inner cavity of the cylindrical shell (15) is rectangular in shape, the shape of the second electromagnet (14) matches the inner cavity of the cylindrical shell (15), and the second electromagnet (14) contacts the inner cavity wall of the cylindrical shell (15).

Images