A locomotive DC-AC network grounding relay testing device

Abstract

The present application relates to the technical field of locomotive equipment test, and disclose a kind of ground relay test device for locomotive dc ac power grid, including shell, hand push frame, setting in the shell;Carrying plate, setting in the bottom of hand push frame;Probe assembly, equidistantly set on the carrying plate, for testing;Pressure equalizing component, set on the carrying plate, for making the pressure that each probe assembly suffers consistent;The pressure equalizing component includes: sleeve, sleeve is set in the outside of probe assembly;Fixed component, for connecting and fixing between the carrying plate and the sleeve.This application can realize the consistent pressure degree of each probe head when the height of each contact of the equipment to be tested is not the same, avoid the situation that the wear degree of each probe head is not the same due to the inconsistent pressure degree of each probe head.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of locomotive equipment test, in particular to a ground relay test device for locomotive DC / AC power grid. BACKGROUND

[0002] The power grid insulation monitoring device (ground relay test device) is an indispensable monitoring device for the present harmonious locomotive. The present power grid insulation monitoring device is mainly divided into 110V DC power grid insulation monitoring device, 220V AC power grid insulation monitoring device and 440V AC power grid insulation monitoring device.

[0003] When testing the equipment, the hand push frame is manually rotated to make the carrier plate and the probe below contact each other with the contacts on the equipment, and then the test is carried out. Since the contacts on the equipment have different heights in actual test, when the carrier plate with the probe is lowered, some probes will first contact the high contacts, and then the carrier plate continues to move to lower the remaining probes, and the subsequent probes will contact the subsequent contacts. In this process, the probes that first contact the contacts and the probes that later contact the contacts will be subjected to different pressures. The different pressures of the probes will cause different degrees of wear of the probes over a long period of time, affecting the use. Moreover, the test after the maintenance is usually completed by building a simple power supply and grounding circuit and a multimeter to complete the test of the equipment. This test usually requires the tester to be familiar with the test circuit and to have a good understanding of the parameters of the grounding circuit. Each test channel and line grounding test needs to be reconnected. The steps are complicated, the grounding test precision is not high, and there is a certain safety risk in the experiment process, such as short circuit and burning of the power grid insulation monitoring device caused by connecting the AC power supply to the DC power supply.

[0004] Therefore, it is necessary to invent a ground relay test device for locomotive DC / AC power grid to solve the above problems. SUMMARY

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

[0006] To achieve the above purpose, the present application provides the following technical scheme: a ground relay test device for locomotive DC / AC power grid, comprising a shell, a hand push frame arranged on the shell, a carrier plate arranged at the bottom of the hand push frame, a probe assembly equidistantly arranged on the carrier plate for testing, and an equalizing assembly arranged on the carrier plate for keeping the pressure of each probe assembly consistent.

[0007] The equalizing assembly comprises:

[0008] a sleeve arranged outside the probe assembly.

[0009] a fixing assembly for fixing the connection between the carrier plate and the sleeve;

[0010] a control assembly for canceling the fixing of the connection between the carrier plate and the sleeve by the fixing assembly and fixing the sleeve when the probe assembly is pressed to a set value.

[0011] Further, the probe assembly comprises:

[0012] a probe shell fixedly installed inside the sleeve;

[0013] a first spring arranged inside the probe shell;

[0014] a probe head slidingly arranged inside the probe shell.

[0015] Further, the fixing assembly comprises:

[0016] a clamping plate slidingly arranged 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 arranged inside the carrier plate, the magnetic block being located between the first electromagnet and the clamping plate;

[0019] a second spring arranged on a side of the clamping plate close to the sleeve for driving the clamping plate to reset.

[0020] Further, the control assembly comprises:

[0021] a switch arranged outside the probe shell, the switch being a press switch, a button of the switch extending into the probe shell;

[0022] a positioning frame having one end connected to the sleeve;

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

[0024] a cylinder shell sleeved outside the second electromagnet, the cylinder shell being made of iron;

[0025] a connecting plate installed outside the shell, the cylinder shell being connected to the bottom of the connecting plate;

[0026] a controller for controlling the first electromagnet and the second electromagnet to be powered on and powered off.

[0027] Further, a dustproof assembly for preventing dust and impurities from adhering to the surface of the sleeve is arranged outside the sleeve.

[0028] The dustproof assembly comprises:

[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] A shielding sleeve connecting the lower ring plate and the sleeve, and connecting the upper ring plate and the carrier plate.

[0032] Further, the shielding sleeve is specifically a telescopic sleeve.

[0033] Further, the shell is provided with a vertical plate, and the vertical plate is respectively provided with a direct-current voltmeter and an alternating-current voltmeter.

[0034] Further, the shell is provided with a control panel matched with the probe head for testing.

[0035] Further, the positioning frame is made of plastic, and the positioning frame is L-shaped.

[0036] Further, the inner cavity of the barrel shell is rectangular, the shape of the second electromagnet matches the shape of the inner cavity of the barrel shell, and the second electromagnet is in contact with the inner cavity wall of the barrel shell.

[0037] The technical effects and advantages of the present application are as follows:

[0038] When the heights of the contacts of the device to be tested are different, the present application can ensure that the pressure of each probe head is consistent, thereby avoiding the situation that the wear degree of each probe head is inconsistent due to the inconsistent pressure of each probe head. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The structure of the locomotive DC / AC grounding relay test device of the embodiment of the present application is shown in the structure schematic diagram;

[0040] Figure 2 The cross-sectional structure of the carrier plate of the embodiment of the present application is shown in the structure schematic diagram Figure 1 ;

[0041] Figure 3 The enlarged structure schematic diagram of the embodiment of the present application is shown in the structure schematic diagram Figure 2 ;

[0042] Figure 4 The cross-sectional structure of the carrier plate of the embodiment of the present application is shown in the structure schematic diagram Figure 2 ;

[0043] Figure 5 The enlarged structure schematic diagram of the embodiment of the present application is shown in the structure schematic diagram Figure 4 ;

[0044] Figure 6 The test circuit diagram of the embodiment of the application is shown.

[0045] In the figure: 1, housing; 2, hand push frame; 3, carrier plate; 4, sleeve; 5, probe shell; 6, first spring; 7, probe head; 8, clamping plate; 9, magnetic block; 10, first electromagnet; 11, second spring; 12, switch; 13, positioning frame; 14, second electromagnet; 15, barrel shell; 16, connecting plate; 17, lower ring plate; 18, upper ring plate; 19, shielding sleeve; 20, alarm indicator light; 21, analog ground adjustable resistance knob; 22, DC and AC conversion switch; 23, grounding 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 scheme and advantages of the embodiment of the application more clear, the technical scheme of the application will be described clearly and completely below in combination with the embodiments.

[0047] The application provides a ground relay test device for a locomotive DC / AC power grid, as shown in the figure, comprising a housing 1, a hand push frame 2, a carrier plate 3, a probe assembly and a voltage equalizing assembly. Figures 1 to 5 The hand push frame 2 is arranged on the housing 1, and is a hand push frame on a PCBA voltage and current function test fixture in the prior art. The carrier plate 3 is symmetrically and fixedly installed at the bottom of the hand push frame 2. The probe assembly is equidistantly arranged on the carrier plate 3 and used for testing. The voltage equalizing assembly is arranged on the carrier plate 3 and used for keeping the pressure on each probe assembly consistent.

[0048] The voltage equalizing assembly comprises a sleeve 4, a fixing assembly and a control assembly.

[0049] The sleeve 4 is fixedly sleeved outside the probe assembly. A sliding hole matched with the sleeve 4 is formed in the carrier plate 3. The sleeve 4 is arranged in the sliding hole. The fixing assembly is used for connecting and fixing the carrier plate 3 and the sleeve 4. The control assembly is used for canceling the connection and fixation between the carrier plate 3 and the sleeve 4 by the fixing assembly and fixing the sleeve 4 when the pressure on the probe assembly reaches a set value.

[0050] In use, the device to be tested is placed on top of the housing 1. Then, by pulling the pusher 2, it lowers the carrier plate 3, which in turn lowers the probe assembly, causing the probe assembly to contact the contacts of the device under test. As the carrier plate 3 descends, pressure is continuously applied to the probe assembly. When the pressure reaches a set value, the control component controls the fixing component to cancel the connection between the carrier plate 3 and the sleeve 4, and then fixes the position of the sleeve 4, preventing it from moving. This prevents the carrier plate 3 from continuing to descend with the sleeve 4, so the position of the probe assembly remains unchanged, and the probe assembly is fixed by the applied pressure. The same principle applies thereafter. As the carrier plate 3 descends, when subsequent probe assemblies contact subsequent contacts, and when the pressure reaches a set value, the sleeve 4 connected to the probe assembly is fixed, and the fixing of the sleeve 4 to the fixing component is canceled. Finally, the positions of the sleeves 4 connected to all probe assemblies are fixed, and the pressure on the probe assemblies is consistent.

[0051] During actual testing, the contacts on the device are at different heights. When the carrier plate 3 lowers with the probe assembly, some probe assemblies will first contact the higher contacts. Then, as the carrier plate 3 continues to move and lowers with the remaining probe assemblies, subsequent probe assemblies will contact subsequent contacts. During this process, the pressure on the probe assemblies that contact the contacts first and the probe assemblies that contact the contacts later will be different. Over time, this uneven pressure on the probe assemblies will lead to uneven wear on each probe assembly, affecting its use. The above operation ensures that the pressure on each probe assembly is consistent, avoiding uneven wear on each probe assembly.

[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 installed inside the sleeve 4. The first spring 6 is located inside the probe housing 5. The probe head 7 is slidably located inside the probe housing 5. A transmission line is connected to the probe head 7 and 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 comes into contact with the contact point, 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 make stable and sufficient contact with the contact point.

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

[0056] The inner wall of the sliding hole is provided with a receiving groove, the clamping plate 8 is slidingly installed in the receiving groove, the side of the clamping plate 8 close to the sleeve 4 is provided with a rubber pad, the clamping plate 8 cooperates with the rubber pad to clamp and fix the sleeve 4, the magnetic block 9 is fixedly installed on the side of the clamping plate 8 away from the sleeve 4, the first electromagnet 10 is fixedly installed on the inner wall of the side of the receiving groove away from the sleeve 4, the magnetic block 9 is located between the first electromagnet 10 and the clamping plate 8, the magnetic pole direction of the first electromagnet 10 is the same as that of the magnetic block 9 when the first electromagnet 10 is electrified, the second spring 11 is arranged on the side of the clamping plate 8 close to the sleeve 4 and is used to drive the clamping plate 8 to reset, specifically, the inner walls of the two sides of the receiving groove are provided with moving grooves, the two ends of the clamping plate 8 are slidingly arranged in the corresponding moving grooves, the two ends of the second spring 11 are fixedly connected with the side of the clamping plate 8 close to the sleeve 4 and the inner wall of the moving groove, respectively, and the magnetic force generated by the first electromagnet 10 when the first electromagnet 10 is electrified is enough to overcome the elastic force of the second spring 11 to repel the clamping plate 8 to move close to the sleeve 4 and abut against the surface of the sleeve 4.

[0057] As shown in Figure 2 and Figure 3 , the control assembly comprises a switch 12, a positioning frame 13, a second electromagnet 14, a barrel 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 press switch, the button of the switch 12 extends to the inside of the probe shell 5, the end of the button of the switch 12 is provided with a curved surface, one end of the positioning frame 13 is fixedly connected with the sleeve 4, the second electromagnet 14 is fixedly connected with the other end of the positioning frame 13, the barrel shell 15 is sleeved on the outside of the second electromagnet 14, the material of the barrel shell 15 is iron, the connecting plate 16 is fixedly installed on the outside of the shell body 1, the barrel shell 15 is fixedly connected with the bottom of the connecting plate 16, the controller is not shown in the figure and is used to control the electrification and de- electrification of the first electromagnet 10 and the second electromagnet 14.

[0059] In use, the first electromagnet 10 is controlled by the controller to be energized to have magnetism, the first electromagnet 10 repels the magnetic block 9 to move the clamp plate 8 and the rubber pad towards the sleeve 4, and finally the clamp plate 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 is lowered to make the clamped sleeve 4 move, so that the probe shell 5 and the probe head 7 move, the probe head 7 cannot continue to move after being in contact with the contact, and the probe shell 5 is lowered to compress the first spring 6, at this time the probe head 7 moves relative to the probe shell 5, the probe head 7 then contacts the button of the switch 12, and the arc surface presses the button of the switch 12, at this time the switch 12 controls the first electromagnet 10 to be de-energized to lose magnetism, the second spring 11 resets the clamp plate 8 to cancel the clamping and fixing of the sleeve 4, in the process of lowering the sleeve 4, the positioning frame 13 and the second electromagnet 14 are lowered, when the switch 12 is pressed, the switch 12 controls the second electromagnet 14 to be energized to have magnetism, 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 the compressed state, at this time the probe head 7 is subjected to constant pressure, and when the carrier plate 3 continues to be lowered, the sleeve 4 separated from the clamp plate 8 remains stationary and does not lower with the carrier plate 3, and the subsequent process is the same as above, and finally when each switch 12 is pressed, the separation between the sleeve 4 and the clamp plate 8 installed on the carrier plate 3 and the fixation of the position of the sleeve 4 can be achieved, since the trigger is when the probe head 7 presses the button 12, the compression degree of each first spring 6 is consistent, so that the compression of each probe head 7 is consistent;

[0060] After the test is completed, the second electromagnet 14 is de-energized to lose magnetism, the compressed first spring 6 releases the force to lift the probe shell 5, the positioning frame 13, the second electromagnet 14, and finally the first spring 6 returns to the initial state, and then the drive carrier plate 3 is lifted, and the carrier plate 3 contacts the positioning frame 13 to lift the positioning frame 13, the sleeve 4, the probe shell 5, the probe head 7 and the second electromagnet 14.

[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 of the sleeve 4 by the clamp plate 8 cooperating with the rubber pad, and causes the clamp plate 8 to slip between the sleeve 4 when the carrier plate 3 cooperates with the clamp plate 8 to clamp the sleeve 4 to be lowered and force the probe head 7, which affects normal use, in order to avoid the above situation, as shown in the drawings, the outer part of the sleeve 4 is provided with a dustproof assembly for preventing dust and impurities from being attached to the surface thereof; Figures 2 to 3

[0062] The dustproof assembly comprises 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.

[0064] When the sleeve 4 is fixed in position, the carrier plate 3 descends, bringing the lower ring plate 17 down with it, which causes the lower shielding sleeve 19 to unfold. At the same time, the upper shielding sleeve 19 also unfolds as the carrier plate 3 descends. The unfolded shielding sleeve 19 can finally wrap around the sleeve 4, preventing dust and impurities from adhering to the surface of the sleeve 4 and avoiding the slippage mentioned above. When the carrier plate 3 rises, 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, the housing 1 is provided with a vertical plate 28, on which a 110V DC voltmeter and a 220V AC voltmeter are respectively installed. The housing 1 is provided with a control panel that works with the probe head 7 for conducting tests.

[0067] After the probe head 7 comes into contact with the contact point, it can perform a test in conjunction with the test circuit set inside the housing 1.

[0068] The surface of housing 1 is provided with a control panel that works with the test circuit. The control panel includes: an alarm indicator light 20, an adjustable resistor knob for simulating grounding 21, a DC to AC conversion switch 22, a grounding point test switch 23, an L1 open circuit test switch 24, an L2 open circuit test switch 25, a 220V relay test button 26, a 110V relay test button 27, and a rocker three-position switch.

[0069] Different models of power grid insulation monitoring devices can be selected using a rocker-type three-position switch. During testing, the corresponding test button must be selected to complete the test, reducing the risk of misoperation when testing different models. The insulation values ​​of L1 and L2 can be tested back and forth without switching circuits. All alarm values ​​can be tested. It also integrates open circuit protection, ground fault alarm, and alarm channel testing.

[0070] (1) Test circuit

[0071] The 220V AC mains input is connected to a fuse and then 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 from the switching power supply is connected to a DC voltmeter. 110V+ is connected to point 8 of relay KA1, and 110V- is connected to point 5 of relay KA1. A1 is for 110V+, and A2 is for 110V-.

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

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

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

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

[0077] When KA1 relay is closed, it is DC power grid test, at this time L1 is positive terminal and L2 is negative terminal.

[0078] When KA2 relay is closed, it is AC power grid test, at this time L1 is AC1 and L2 is AC2.

[0079] When KA3 relay is opened, L1 will keep the existing insulation value. After 10 minutes of opening, the power grid test device displays "E-----".

[0080] When KA4 relay is opened, L2 will keep the existing insulation value. After 10 minutes of opening, the power grid test device displays "E-----".

[0081] Adjustable resistors R1 and R2 are 500K ohm resistors, which can be adjusted from 500K ohm to 0 ohm.

[0082] Among them, when the DC power grid insulation device is above 200K ohms, it displays OL, and below 200K ohms, it displays the specific insulation value. When the alarm value is reached, the two alarm indicator lights of the DC power grid insulation device are on, and the two indicator lights of the test instrument display alarm channel are also on.

[0083] The AC power grid insulation device displays OL when the insulation is above 500K ohms, and displays the specific insulation value when it is below 500K ohms. At the same time, one alarm indicator light of the AC power grid insulation device is on, and one indicator light of the test instrument display alarm channel is also on. When it is below 200K ohms, two alarm indicator lights of the AC power grid insulation device are on, and two indicator lights of the test instrument display alarm channel are also on.

[0084] (2) Switching circuit

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

[0086] The boat switch is connected to SB1 in I gear, and SB1 controls KA1 coil to turn on the DC power grid insulation device test.

[0087] SB2 is connected to SB2 in II gear, and SB2 controls KA2 coil to turn on the AC power grid insulation device test.

[0088] SB3 connects to KA3 coil to disconnect L1 line test, SB4 connects to KA4 coil to disconnect L2 line test;

[0089] The negative end of KA1, KA2, KA3, KA4 relay is connected back to A2.

[0090] (3) Probe test needle circuit

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

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

[0093] The power grid insulation monitoring devices 11, 14 are a group of normally open channels. When the insulation value is lower than the alarm value, the power grid insulation monitoring device itself alarm lamp will light up. At this time, the channel is closed. The indicator lamp connected in series behind point 14 is also lit at the same time.

[0094] Similarly, the power grid insulation monitoring devices 21, 24 are a group of normally open channels. When the insulation value is lower than the alarm value, the power grid insulation monitoring device itself alarm lamp will light up. At this time, the channel is closed. The indicator lamp connected in series behind point 24 is also lit at the same time.

[0095] The device is compatible with multiple models of grounding relay testers, which can greatly improve test efficiency, accuracy, safety, and is easy to operate, reducing human safety risks and improving test accuracy.

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

[0097] As shown in Figure 2 , the inner cavity of the cylinder shell 15 is rectangular in shape, and the shape of the second electromagnet 14 matches the shape of the inner cavity of the cylinder shell 15. The second electromagnet 14 is in contact with the inner cavity wall of the cylinder shell 15.

[0098] So that the second electromagnet 14 can be attracted and fixed to the inner wall of the cylinder shell 15 after being energized.

[0099] Working principle: in use, the controller controls the first electromagnet 10 to be electrified to have magnetism, the first electromagnet 10 repels the magnetic block 9 to make it move to the direction close to the sleeve 4 with the clamp plate 8 and the rubber pad, finally the clamp plate 8 cooperates with the rubber pad and the inner wall of the sliding hole to clamp and fix the sleeve 4, place the device to be tested on the top of the shell 1, then pull the handcart 2 to make it descend with the carrier plate 3, the carrier plate 3 descends to make the clamped sleeve 4 move, so that the probe shell 5, the probe head 7 move, the probe head 7 cannot continue to move after contacting the contact, with the continuous descent of the carrier plate 3, the probe shell 5 descends to compress the first spring 6, at this time the probe head 7 moves relative to the probe shell 5, the probe head 7 then contacts the button of the switch 12, and the curved surface extrudes the button of the switch 12, at this time the switch 12 controls the first electromagnet 10 to be deenergized to lose magnetism, the second spring 11 resets the clamp plate 8 to cancel the clamping and fixing of the sleeve 4, in the process of the descent of the sleeve 4, the positioning frame 13 and the second electromagnet 14 descend, when the switch 12 is pressed, the switch 12 controls the second electromagnet 14 to be electrified to have magnetism, 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 the compressed state, at this time the probe head 7 is subjected to constant pressure, then the carrier plate 3 continues to descend, the sleeve 4 separated from the clamp plate 8 remains stationary and does not descend with the carrier plate 3, the subsequent process is the same as above, finally when each switch 12 is pressed, the separation between the sleeve 4 and the clamp plate 8 installed on the carrier plate 3 and the fixation of the position of the sleeve 4 can be achieved, since it is triggered when the probe head 7 presses the button 12, the compression degree of each first spring 6 is consistent, so that the pressure received by each probe head 7 is consistent, after the test is completed, the second electromagnet 14 is deenergized to lose magnetism, the compressed first spring 6 releases the force to make the probe shell 5, the positioning frame 13, the second electromagnet 14 ascend, finally the first spring 6 returns to the initial state, then the drive carrier plate 3 ascends, the carrier plate 3 contacts the positioning frame 13 to make the positioning frame 13, the sleeve 4, the probe shell 5, the probe head 7 and the second electromagnet 14 reset, during the whole test process, the pressure received by each probe head 7 is consistent;

[0100] Since the contacts on the device have different heights during actual testing, when the carrier plate 3 descends with the probe assembly, part of the probe assembly will first contact the higher contacts, then the carrier plate 3 continues to move to make the remaining probe assembly descend, the subsequent probe assembly will contact the subsequent contacts, during this process, the probe assembly that contacts the contacts first and the probe assembly that contacts the contacts later will receive different pressures, the different pressures received by the probe assemblies will cause the wear degree of each probe assembly to be different over a long period of time, which will affect the use, through the above operation, the pressure received by each probe assembly is consistent, so that the wear degree of each probe assembly is consistent;

[0101] Due to long-term use, a large amount of dust impurities are attached to the sleeve 4, which affects the stability of the clamping of the sleeve 4 by the rubber pad matched with the clamping plate 8, and when the carrier plate 3 is lowered to clamp the sleeve 4 and force the probe head 7, the clamping plate 8 and the sleeve 4 may slip, affecting normal use. In order to avoid the above situation, when the position of the sleeve 4 is fixed, the carrier plate 3 is lowered, the lower ring plate 17 is lowered, the lower shielding sleeve 19 is pulled to expand, and at the same time, the upper shielding sleeve 19 is also expanded with the lowering of the carrier plate 3. The expanded shielding sleeve 19 can wrap the sleeve 4, so as to avoid the attachment of dust impurities on the surface of the sleeve 4 and avoid the above slipping situation. When the carrier plate 3 rises, the shielding sleeve 19 is retracted.

[0102] The above examples are only used to illustrate the technical solutions of the present application, but not limit it.

Claims

1. A grounding relay test device for a locomotive DC / AC power grid, comprising a housing (1), characterized in that: A pusher (2) is mounted on the housing (1); A carrier plate (3) is disposed at the bottom of the pusher frame (2); The probe assembly is equidistantly arranged on the carrier plate (3) for conducting experiments; A pressure equalization assembly is disposed on the carrier plate (3) to ensure that the pressure on each of the probe assemblies is consistent; The equalizing component includes: A sleeve (4) is fitted over the outside of the probe assembly; A fixing component is used to connect and fix the carrier plate (3) and the sleeve (4); A control component is used to cancel the connection between the carrier plate (3) and the sleeve (4) by the fixing component and to fix the sleeve (4) when the probe assembly is pressurized to a set value.

2. The grounding relay test device for locomotive DC / AC power grid according to claim 1, characterized in that: The probe assembly includes: The probe housing (5) is fixedly installed 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).

3. The grounding relay test device for locomotive DC / AC power grid according to claim 2, characterized in that: The fixing component includes: The clamping plate (8) is slidably disposed inside the carrier plate (3) for clamping and fixing the sleeve (4); A magnetic block (9) is disposed on the side of the clamping plate (8) away from the sleeve (4); The first electromagnet (10) is disposed 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 the side of the clamping plate (8) near the sleeve (4) for driving the clamping plate (8) to reset.

4. The grounding relay test device for locomotive DC / AC power grid according to claim 3, characterized in that: The control component includes: A switch (12) is provided on the outside of the probe housing (5). The switch (12) is a push switch, and the button of the switch (12) extends into the inside of the probe housing (5). The positioning frame (13) is connected at one end to the sleeve (4); The second electromagnet (14) is connected to the other end of the positioning frame (13); A cylindrical shell (15) is fitted over the outside of the second electromagnet (14), and 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); The controller is used to control the first electromagnet (10) and the second electromagnet (14) to be energized and de-energized.

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

6. The grounding relay test device for locomotive DC / AC power grid 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 / AC power grid according to claim 6, characterized in that: The housing (1) is provided with a vertical plate (28), 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 / AC power grid according to claim 7, characterized in that: The housing (1) is provided with a control panel that works in conjunction with the probe head (7) for conducting tests.

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

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

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