An electric leakage fault detection apparatus and method for electromechanical installation

Abstract

The application discloses a kind of electric leakage fault detection equipment and detection method for electromechanical installation, detection equipment includes test pen, pen tip metal body is installed on the insulated handle of test pen, upper shell, lower sleeve shell and base are sequentially installed in the lower end of insulated handle;Lower sleeve shell is slidably installed on upper shell;The base is equipped with clamping structure, clamping structure includes two oppositely arranged clamping arms, two clamping arms are located at the two sides of pen tip metal body respectively, and two clamping arms can be close to each other or away from each other;Rotary locking structure for outputting rotary power to clamping structure is provided on lower sleeve shell, and elastic back position structure is provided between upper shell and lower sleeve shell.The present application utilizes clamping structure to be clamped and connected with the part to be measured, realizes the use mode change from intermittent point detection to continuous contact monitoring, for large electromechanical installation or complex circuit debugging that needs to verify repeatedly on-off electricity at the same point, eliminates a large number of useless repeated actions and time loss, so that work flow is more smooth.

Description

Technical Field

[0001] This invention relates to the field of leakage current detection technology, specifically to a leakage current fault detection device and method for electromechanical installation. Background Technology

[0002] A test pen is a fundamental safety testing tool used during the installation and commissioning of electromechanical equipment. It can quickly and intuitively determine whether electrical circuits or metal parts of equipment are energized, thus providing operators with crucial safety warnings. Structurally, whether it is the traditional neon tube type or the modern digital type, its design aims to ensure safe use and clear indication: the neon tube type uses a current-limiting resistor, a neon tube, and a metal pen tail to form a detection circuit, while the digital type relies on an electronic induction circuit and a display module. When using it, it must be held in the correct posture to ensure that the fingers reliably contact the metal part of the pen tail. For example, when distributing electricity, it can distinguish between the phase wire and the neutral wire to ensure correct wiring, or after the equipment is powered on, it can be used to check the metal casing of motors, control cabinets, etc. If the test pen indicates that it is energized, it immediately warns of a serious hidden danger of leakage or insulation damage, and the power must be disconnected for investigation. As disclosed in CN120334799B, a leakage current fault detection device for electromechanical engineering equipment installation includes a detection module, a supply module, and an operation module connected in sequence. The operation module has an internal gas supply channel filled with inert gas. The front end of the gas supply channel has an inlet and outlet. Inside, there is a contact-opening shield and a detection device that shields the gas supply channel between the gas supply channel and the supply module channel. The detection end of the detection device enters the front end of the gas supply channel and is sealed within the inert gas by the contact-opening shield. A driving component connects the operation module and the detection device to automatically open the contact-opening shield, resealing the detection end within the gas supply channel. The gas supply channel is filled with inert gas. The sealing effect of the contact-opening shield and the encapsulation effect of the inert gas contain the used detection end in a safe environment, reducing... To minimize dust corrosion and prevent accidental electrical arcing, the aforementioned technical solution also uses a pen tip probe to contact the circuit and quickly determine the presence or absence of voltage. The indicator light illuminates or turns off to indicate the circuit status to the operator. However, the metal pen tip can only contact the power socket and terminal block under test, and must be retrieved after use, i.e., a one-test-one-retrieve usage mode. The installation and commissioning of electromechanical equipment often involves repeated verification of multiple parts under test in the same power distribution circuit, such as power input lines, circuit breaker terminals, contactor contacts, and load terminals, or multiple confirmations of the same part under test at different stages such as power-on, power-off, and commissioning. For each test, the operator must take out the pen, hold it, align it for contact, observe, remove it, and retrieve it. Therefore, while both hands are working together to connect, fix, or adjust, frequently freeing one hand to operate the test pen will disrupt the continuous workflow and reduce operational efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a leakage fault detection device and method for electromechanical installation. The metal tip of the test pen touches the contact point to be tested to determine whether the point is energized or leaking current. At this time, due to the contact action between the metal tip of the pen and the test part such as the power supply line, the upper and lower ports of the circuit breaker, the contactor contacts, or the load terminals, the clamping structure, the base, and the lower shell retract along the axial direction to above the metal tip of the pen. At this time, the elastic retraction structure is in a compressed state. When the test part is tested repeatedly, the clamping structure is operated by the rotation locking structure, and the clamping structure is clamped and connected to the test part. At this time, the metal tip of the pen still maintains contact with the test part. When installing and debugging electromechanical circuits, it is possible to observe whether the test pen lights up, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A leakage current fault detection device for electromechanical installation includes a test pen. A metal tip is mounted on the insulating handle of the test pen. An upper shell, a lower shell, and a base are sequentially mounted on the lower end of the insulating handle of the test pen. The upper shell, lower shell, and base are all fitted onto the outside of the metal tip. The lower shell is slidably mounted on the upper shell and can slide upward or downward relative to the upper shell. The base is provided with a clamping structure, which includes two opposing clamping arms located on both sides of the metal tip and capable of moving closer or further apart from each other.

[0005] As an improvement, the lower part of the pen tip metal body is provided with a protruding tongue, which is located below the base. The upper end of the tongue abuts against the base and is used to limit the base. The tongue is the lowest point of the base's downward movement and prevents the base from sliding further downward.

[0006] As an improvement, the lower side of the base is provided with an H-shaped edge, and a first sliding groove and a second sliding groove are respectively provided on both sides of the H-shaped edge. The extension direction of the H-shaped edge, the first sliding groove, and the second sliding groove is consistent with the movement direction of the two clamping arms. The clamping structure also includes two horizontally arranged racks and a driven gear ring rotatably mounted on the base, located on the outside of the pen tip metal body. The two racks are respectively fixed to the upper ends of the two clamping arms. The extension direction of the racks is consistent with the extension direction of the H-shaped edge. The two racks are slidably mounted in the first sliding groove and the second sliding groove respectively. Both racks mesh with the driven gear ring and are located on both sides of the driven gear ring. When the driven gear ring rotates, it can drive the two racks to move, thereby causing the two clamping arms to move away from or towards each other.

[0007] As an improvement, the lower housing has a rotary locking structure inside for outputting rotational power to the clamping structure. A partition is located in the middle of the lower housing, dividing its interior into an upper chamber and a lower chamber. The partition has a first through hole allowing the pen tip metal body to pass through. The rotary locking structure is located in the lower chamber. The rotary locking structure includes a worm gear horizontally rotatably mounted in the lower chamber and a vertically arranged worm wheel meshing with the worm gear. One end of the worm gear extends to the outside of the lower housing and is fixed with an anti-slip knob. The base has a second through hole in the middle allowing the pen tip metal body to pass through. A T-shaped hollow shaft is rotatably mounted in the second through hole, and the driven gear ring is fixed to the lower end of the T-shaped hollow shaft. The driven gear ring is located on the lower side of the base. The rotary locking structure also includes a plastic hollow shaft mounted on the upper end of the T-shaped hollow shaft, and the worm wheel is fixedly mounted on the plastic hollow shaft.

[0008] As an improvement, a steel block is provided on the side of the clamping arm near the metal body of the pen tip. The steel block has a concave curved surface and anti-slip grooves on both sides of the curved surface.

[0009] As an improvement, the outer side of the lower part of the upper shell is provided with a retaining part, and a sandwich part is provided between the retaining part and the outer wall of the upper shell. The upper end of the lower shell is located in the sandwich part and the upper end of the lower shell can slide up and down in the sandwich part.

[0010] As an improvement, an elastic retraction structure is provided between the upper shell and the lower shell. The elastic retraction structure includes an upper corner seat, a spring, and a lower corner seat that are fixedly connected from top to bottom. The upper corner seat is located at the lower end of the upper shell, and the lower corner seat is located at the upper end of the lower shell.

[0011] As an improvement, the number of upper corner seats, springs, and lower corner seats are all four, with one upper corner seat, one spring, and one lower corner seat forming a group, and the four groups are respectively set at the four corners of the upper shell and the lower shell.

[0012] As an improvement, a vertically arranged guide strip is fixed on the inner wall of the upper shell, and a third sliding groove adapted to the guide strip is fixed on the inner wall of the lower shell. The lower end of the third sliding groove is fixedly connected to the partition. The lower end of the guide strip extends into the third sliding groove and can slide up and down in the third sliding groove.

[0013] The present invention also provides a method for detecting leakage faults in electromechanical installations. Using the above-mentioned detection equipment, the detection method includes the following steps: S101: The operator holds the upper housing of the testing device, makes good contact with the conductive part at the tail with their fingers, and then places the metal tip of the pen against the position to be tested. Under the action of the contact pressure, the clamping structure, the base and the lower housing will overcome the elastic force of the elastic retraction structure and move backward relative to the upper housing. The elastic retraction structure is in a compressed state. The operator observes the indicator window of the test pen. If the neon tube is lit, it is confirmed that there is a voltage to ground at that position of the electromechanical equipment, indicating a leakage fault. S102: By rotating the anti-slip knob of the worm gear on the rotary locking structure, the rotary locking structure will drive the clamping arms in the clamping structure to move and make the two clamping arms clamp the part to be tested and form a tight friction force between them. The two clamping arms firmly connect the testing equipment to the part to be tested. Even if the operator releases the test pen, the metal body of the pen tip can still maintain reliable electrical contact with the part to be tested under the combined action of the mechanical self-locking of the rotary locking structure and the pressure provided by the elastic retraction structure. S103: When the operator operates the circuit breaker, live contactor or disconnects each branch connection in the distribution box, and tests are required after each operation, the operator should touch the conductive part at the end of the test pen with their finger according to the test requirements and observe the status of the indicator light on the test pen. The operator can then determine whether there is a voltage to ground at the part to be tested. S104: After locating the fault and completing the repair, the operator can once again make good contact with the conductive part at the tail of the testing equipment and observe the test pen to confirm that its neon tube has been completely extinguished, indicating that the leakage hazard has been eliminated; the worm gear of the reverse rotation locking structure is released from clamping, causing the metal body of the pen tip to separate from the part to be tested. Under the reset action of the elastic retraction structure, the testing equipment is reset.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The electromechanical installation leakage fault detection device and method, through the arrangement of a test pen, an upper shell, a flexible retraction structure, a lower shell, a base, a clamping structure, and a rotating locking structure, etc., cooperate with each other. The metal tip of the test pen touches the contact point to be tested to determine whether the point is energized or leaking current. At this time, due to the contact action between the metal tip of the pen and the test part such as the power supply line, the upper and lower ports of the circuit breaker, the contactor contacts, or the load terminals, the clamping structure, the base, and the lower shell retract along the axial direction to above the metal tip of the pen. The elastic retraction structure is in a compressed state. When the part to be tested is tested repeatedly, the clamping structure is operated by the rotating locking structure. The clamping structure is used to clamp and connect with the part to be tested. At this time, the metal body of the pen tip is still in contact with the part to be tested. When installing and debugging electromechanical circuits, you can observe whether the test pen lights up. This realizes the transformation of the usage mode from intermittent point detection to continuous contact monitoring. For large electromechanical installations or complex circuit debugging that requires repeated power-on and power-off verification at the same point, it eliminates a lot of useless repetitive actions and time loss, making the workflow smoother and more compact. By using a fixed test pen, continuous monitoring of the main power supply line of a circuit or a contactor contact that requires repeated debugging can be achieved simply by installing and locking it once. This keeps the pen in contact throughout the entire debugging process, allowing debugging personnel to perform other complex installation and debugging operations without interruption. They only need to observe the status of the test pen's indicator light to continuously obtain information about the circuit's electrical status. Furthermore, by using a precise and stable clamping installation, the pen tip can be safely positioned on the target part to be tested. After that, there is no need to perform any manual contact operation on this point, which can avoid accidental short circuits caused by hand tremors, blind spots, or fatigue. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a leakage current detection device for electromechanical installation according to Embodiment 1 of the present invention; Figure 2 yes Figure 1 Sectional view at point AA; Figure 3 yes Figure 1 Cross-sectional view of the three-dimensional structure at point AA; Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ; Figure 7 This is a three-dimensional structural diagram of the enclosure portion of the present invention with the enclosure portion removed from the upper housing. Figure 8 This is a three-dimensional structural diagram of the test pen of the present invention in the state of being separated from the lower casing; Figure 9 This is a schematic diagram of the three-dimensional cross-sectional structure of the lower casing of the present invention. Figure 1 ; Figure 10 This is a schematic diagram of the three-dimensional cross-sectional structure of the lower casing of the present invention. Figure 2 ; Figure 11 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 12 for Figure 1 A three-dimensional structural diagram of the middle clamping arm.

[0016] The attached diagram lists the components represented by each number as follows: 1. Test pen; 2. Pen tip metal body; 21. Tongue; 3. Upper shell; 31. Enclosure part; 32. Interlayer part; 4. Lower shell; 41. Upper chamber; 42. Lower chamber; 43. Partition; 5. Base; 51. H-shaped edge; 52. First slide groove; 53. Second slide groove; 6. Clamping structure; 61. T-shaped hollow shaft; 62. Driven gear ring; 63. Rack; 64. Clamping arm; 65. Steel block; 66. Curved surface; 7. Rotary locking structure; 71. Worm gear; 72. Plastic hollow shaft; 73. Worm wheel; 74. Annular skirt; 741. Lower protrusion; 8. Elastic retraction structure; 81. Guide bar; 82. Upper corner seat; 83. Spring; 84. Third slide groove; 85. Lower corner seat. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. For ease of explanation and not for limitation, the following will be used... Figure 1 The direction of the upper part of the test pen 1 shown is defined as up, and the side opposite it is defined as down.

[0018] Example 1

[0019] Depend on Figures 1 to 6 As shown, a leakage current fault detection device for electromechanical installation includes a test pen 1, with a metal tip 2 mounted on the insulated handle of the test pen 1. The test pen 1 is a conventional electrical tool product that can be purchased from the market, and its internal structure and working principle are existing technologies, which will not be described in detail here.

[0020] The lower end of the insulating handle of the test pen 1 is sequentially fitted with an upper housing 3, a lower housing 4, and a base 5; the upper housing 3, lower housing 4, and base 5 are all fitted onto the outside of the pen tip metal body 2. The lower housing 4 is slidably mounted on the upper housing 3 and can slide upwards or downwards relative to the upper housing 3. The base 5 is provided with a clamping structure 6, which includes two opposing clamping arms 64, located on both sides of the pen tip metal body 2, and the two clamping arms 64 can move closer or further apart from each other. Preferably, the clamping arms 64 are plastic clamping arms; a steel block 65 is provided on the side of the clamping arm 64 closest to the pen tip metal body 2, and the steel block 65 has a concave curved surface 66 and anti-slip grooves on both sides of the curved surface 66; the anti-slip grooves and the curved surface 66 allow the test pen 1 to adapt to different types of parts to be tested, such as round rods, square terminals, and panel openings.

[0021] The upper housing 3 is connected to the handle of the test pen 1. The upper housing 3 serves as a part that the operator holds directly, completely isolating the human body from any possible high-voltage circuits in the circuit.

[0022] The lower part of the pen tip metal body 2 is provided with a protruding tongue 21. The tongue 21 is located below the base 5, and the upper end of the tongue 21 abuts against the base 5 and is used to limit the base 5. The tongue 21 is the lowest point of the base 5 and prevents the base 5 from sliding further downward relative to it. When the device is not in use, the upper end of the tongue 21 contacts the bottom plane of the base 5, thereby setting the lower end point of the lower housing 4, the base 5, and the clamping structure 6 through the tongue 21.

[0023] The lower side of the base 5 is provided with an I-shaped edge 51. A first sliding groove 51 and a second sliding groove 52 are respectively provided on both sides of the I-shaped edge 51. The extending directions of the I-shaped edge 51, the first sliding groove 51, and the second sliding groove 52 are all consistent with the movement direction of the two clamping arms 64. The clamping structure 6 also includes two horizontally arranged racks 63 and a driven gear ring 62 rotatably mounted on the base 5. The driven gear ring 62 is located on the outer side of the pen tip metal body 2. The two racks 63 are respectively fixed to the upper ends of the two clamping arms 64; the extending direction of the racks 63 is consistent with the extending direction of the I-shaped edge 51; the two racks 63 are slidably mounted in the first sliding groove 51 and the second sliding groove 52 respectively. Both racks 63 mesh with the driven gear ring 62, and the two racks 63 are located on both sides of the driven gear ring 62. When the driven gear ring 62 rotates, it can drive the two racks 63 to move, thereby causing the two clamping arms 64 to move away from or towards each other.

[0024] The lower housing 4 has a rotary locking structure 7 inside for outputting rotational power to the clamping structure 6. A partition 43 is located in the middle of the lower housing 4, dividing the interior of the lower housing 4 into an upper chamber 41 and a lower chamber 42. The partition 43 has a first through hole allowing the pen tip metal body 2 to pass through. The rotary locking structure 7 is located in the lower chamber 42. The rotary locking structure 7 includes a worm gear 71 horizontally rotatably mounted in the lower chamber 42, and a vertically arranged worm wheel 73 meshing with the worm gear 71. One end of the worm gear 71 extends to the outside of the lower housing 4 and is fixed with an anti-slip knob. The base 5 has a second through hole in the middle allowing the pen tip metal body 2 to pass through. A T-shaped hollow shaft 61 is rotatably mounted in the second through hole, and the driven gear ring 62 is fixed to the lower end of the T-shaped hollow shaft 61; the driven gear ring 62 is located on the lower side of the base 5. The rotary locking structure 7 also includes a plastic hollow shaft 72 installed on the upper end of the T-shaped hollow shaft 61, and a worm gear 73 is fixedly installed on the plastic hollow shaft 72.

[0025] In this preferred embodiment, the lower end of the plastic hollow shaft 72 is provided with an annular skirt plate 74 that is adapted to the upper end face of the T-shaped hollow shaft 61. The top end of the T-shaped hollow shaft 61 is provided with a plurality of recessed holes, and the bottom end of the annular skirt plate 74 is provided with a plurality of protrusions 741 that are interference-fitted with the recessed holes. The plurality of protrusions 741 are respectively disposed in the corresponding recessed holes.

[0026] In use, the operator rotates the worm gear 71 via the anti-slip knob, which drives the plastic hollow shaft 72 and worm wheel 73 to rotate. This, in turn, causes the plastic hollow shaft 72 and the annular skirt 74 to output rotational power to the clamping structure 6. The worm gear 71 and worm wheel 73 are commercially available worm gear structures with a self-locking function. Existing worm gear structures with a self-locking function can all be used in this application. The self-locking worm gear 71 and worm wheel 73 enable the clamping structure 6 to have self-holding capability, maintaining the existing clamping state without the need for continuous external force.

[0027] Since each of the protrusions 741 on the bottom surface of the annular skirt plate 74 is inserted into the countersunk hole at the top of the T-shaped hollow shaft 61, the rotation of the plastic hollow shaft 72 and the annular skirt plate 74 can drive the T-shaped hollow shaft 61 and the driven gear ring 62 to rotate together around the central axis of the pen tip metal body 2. Then, the two racks 63 located in the first slide groove 52 and the second slide groove 53 can move linearly towards each other under the drive of the driven gear ring 62, that is, the left and right clamping arms 64 and steel blocks 65 approach each other, generating a mechanical locking force that directly acts on the part to be measured or its surrounding structure.

[0028] In this preferred embodiment, a retaining portion 31 is provided on the outer side of the lower part of the upper shell 3, and a sandwich portion 32 is provided between the retaining portion 31 and the outer wall of the upper shell 3. The upper end of the lower shell 4 is located in the sandwich portion 32 and can slide up and down in the sandwich portion 32. An elastic retraction structure 8 is provided between the upper shell 3 and the lower shell 4. The elastic retraction structure 8 includes an upper corner seat 82, a spring 83, and a lower corner seat 85, which are fixedly connected from top to bottom. The upper corner seat 82 is located at the lower end of the upper shell 3, and the lower corner seat 85 is located at the upper end of the lower shell 4. There are four upper corner seats 82, four springs 83, and four lower corner seats 85. One upper corner seat 82, one spring 83, and one lower corner seat 85 form a group, and the four groups are respectively arranged at the four corners of the upper shell 3 and the lower shell 4.

[0029] In this preferred embodiment, both the upper shell 3 and the lower shell 4 have rectangular cross-sectional shapes. A vertically arranged guide strip 81 is fixed to the inner wall of the upper shell 3, and a third sliding groove 84 adapted to the guide strip 81 is fixed to the inner wall of the lower shell 4. The lower end of the third sliding groove 84 is fixedly connected to the partition 43. The lower end of the guide strip 81 extends into the third sliding groove 84 and can slide up and down within it. The left and right inner walls of the lower shell 4 are both fixed with third sliding grooves 84. When the lower end of the pen tip metal body 2 contacts the part to be tested, the clamping structure 6, the base 5, and the lower shell 4 move upward relative to the upper shell 3, compressing the spring 83 between the upper corner seat 82 and the lower corner seat 85. During this process, the third sliding groove 84 and the guide strip 81 slide relative to each other, causing the lower shell 4 to move closer to the upper shell 3 to accommodate contact points of different sizes, ensuring continuous and good contact between the pen tip metal body 2 and the part to be tested.

[0030] The lower housing 4 is slidably installed in the interlayer 32 between the upper housing 3 and the retaining portion 31. When used in conjunction with the elastic retraction structure 8, the lower end of the clamping structure 6 can be positioned higher than the lower end of the pen tip metal body 2. It should be noted that in the above embodiment, all components in contact with the pen tip metal body must be made of insulating material.

[0031] Example 2

[0032] A method for detecting leakage current faults in electromechanical installations, using the detection equipment described in Example 1, includes the following steps: S101: The operator holds the upper housing of the testing device, makes good contact with the conductive part at the tail with their fingers, and then places the metal body 2 of the pen tip against the position to be tested. Under the action of the contact pressure, the clamping structure 6, the base 5 and the lower housing 4 will overcome the elastic force of the elastic retraction structure 8 and move backward relative to the upper housing 3. The elastic retraction structure 8 is in a compressed state. The operator observes the indicator window of the test pen 1. If the neon tube is lit, it is confirmed that there is a voltage to ground at that position of the electromechanical equipment, indicating a leakage fault; otherwise, there is a voltage to ground.

[0033] S102: By rotating the anti-slip knob of the worm gear 71 on the rotary locking structure 7, the rotary locking structure 7 will drive the clamping arm 64 in the clamping structure 6 to move, so that the two clamping arms 64 clamp the part to be tested and form a tight friction force between them. The two clamping arms 64 firmly connect the testing device to the part to be tested. Even if the operator releases the test pen 1, under the combined action of the mechanical self-locking of the rotary locking structure 7 and the pressure provided by the elastic retraction structure 8, the metal body 2 of the pen tip can still maintain reliable electrical contact with the part to be tested.

[0034] S103: When the operator operates the circuit breaker or live contactor in the distribution box or disconnects each branch connection, and a test is required after each operation, the operator should contact the conductive part at the tail of the test pen 1 with their finger according to the test requirements and observe the status of the indicator light of the test pen 1. The operator can then determine whether there is a voltage to ground at the part to be tested.

[0035] S104: After locating the fault and completing the repair, the operator can once again make good contact with the conductive part at the tail of the testing device and observe the test pen 1 to confirm that its neon tube has been completely extinguished, indicating that the leakage hazard has been eliminated; rotate the worm gear 71 of the reverse rotation locking structure 7 to release the clamp, so that the metal body 2 of the pen tip is separated from the part to be tested, and the testing device is reset under the reset action of the elastic disengagement structure 8.

[0036] In summary, the leakage fault detection device and method for electromechanical installation of the present invention, when repeatedly testing the part to be tested, utilizes a rotating locking structure to operate the clamping structure to clamp and connect with the part to be tested, and ensures that the metal body of the pen tip is still in good contact with the part to be tested. During the installation and debugging of electromechanical circuits, it is convenient to observe whether the test pen is lit, thereby determining whether there is a voltage to ground at the part to be tested.

Claims

1. A leakage current fault detection device for electromechanical installation, comprising a test pen (1), wherein a pen tip metal body (2) is mounted on the insulating handle of the test pen (1), characterized in that: The lower end of the insulating handle of the test pen (1) is sequentially fitted with an upper housing (3), a lower sleeve (4) and a base (5); the upper housing (3), the lower sleeve (4) and the base (5) are all fitted on the outside of the metal body of the pen tip (2); the lower sleeve (4) is slidably mounted on the upper housing (3) and can slide up or down relative to the upper housing (3); The base (5) is provided with a clamping structure (6), which includes two opposing clamping arms (64). The two clamping arms (64) are located on both sides of the pen tip metal body (2), and the two clamping arms (64) can move closer to or further away from each other.

2. The leakage current detection device for electromechanical installation according to claim 1, characterized in that: The lower part of the pen tip metal body (2) is provided with a protruding tongue (21). The tongue (21) is located below the base (5). The upper end of the tongue (21) abuts against the base (5) and is used to limit the base (5). The tongue (21) is the lowest point of the base (5) and prevents the base (5) from sliding further downward.

3. The leakage current detection device for electromechanical installation according to claim 2, characterized in that: The base (5) has an I-shaped edge (51) on its lower side. The two sides of the I-shaped edge (51) are respectively provided with a first sliding groove (51) and a second sliding groove (52). The extension directions of the I-shaped edge (51), the first sliding groove (51) and the second sliding groove (52) are consistent with the movement directions of the two clamping arms (64). The clamping structure (6) also includes two horizontally arranged racks (63) and a driven gear ring (62) rotatably mounted on the base (5). The driven gear ring (62) is located on the outside of the pen tip metal body (2). The two racks (63) are respectively fixed to the upper ends of the two clamping arms (64). The extension direction of the racks (63) is consistent with the extension direction of the H-shaped edge (51). The two racks (63) are respectively slidably mounted in the first slide groove (51) and the second slide groove (52). Both racks (63) mesh with the driven gear ring (62) and the two racks (63) are respectively located on both sides of the driven gear ring (62). When the driven gear ring (62) rotates, it can drive the two racks (63) to move, thereby driving the two clamping arms (64) to move away from or closer to each other.

4. The leakage current detection device for electromechanical installation according to claim 3, characterized in that: The lower housing (4) is provided with a rotation locking structure (7) for outputting rotational power to the clamping structure (6). The lower housing (4) is provided with a partition (43) in the middle. The partition (43) divides the interior of the lower housing (4) into an upper chamber (41) and a lower chamber (42). The partition (43) is provided with a first through hole that allows the pen tip metal body (2) to pass through. The rotation locking structure (7) is located in the lower chamber (42). The rotary locking structure (7) includes a worm (71) that is horizontally rotatably installed in the lower chamber (42) and a vertically arranged worm wheel (73) that meshes with the worm (71). One end of the worm (71) extends to the outside of the lower housing (4) and is fixed with an anti-slip knob. The base (5) has a second through hole in the middle that allows the pen tip metal body (2) to pass through. A T-shaped hollow shaft (61) is rotatably installed in the second through hole. The driven gear ring (62) is fixed at the lower end of the T-shaped hollow shaft (61). The driven gear ring (62) is located on the lower side of the base (5). The rotary locking structure (7) also includes a plastic hollow shaft (72) installed on the upper end of the T-shaped hollow shaft (61), and a worm gear (73) is fixedly installed on the plastic hollow shaft (72).

5. The leakage current fault detection device for electromechanical installation according to claim 1, characterized in that: The clamp arm (64) has a steel block (65) on one side near the pen tip metal body (2). The steel block (65) has a concave curved surface (66) and anti-slip grooves on both sides of the curved surface (66).

6. The leakage current detection device for electromechanical installation according to any one of claims 1 to 5, characterized in that: The outer side of the lower part of the upper shell (3) is provided with a barrier (31), and a sandwich part (32) is provided between the barrier part (31) and the outer wall of the upper shell (3). The upper end of the lower shell (4) is located in the sandwich part (32) and the upper end of the lower shell (4) can slide up and down in the sandwich part (32).

7. The leakage current detection device for electromechanical installation according to claim 6, characterized in that: An elastic retraction structure (8) is provided between the upper shell (3) and the lower shell (4). The elastic retraction structure (8) includes an upper corner seat (82), a spring (83) and a lower corner seat (85) that are fixedly connected from top to bottom. The upper corner seat (82) is located at the lower end of the upper shell (3) and the lower corner seat (85) is located at the upper end of the lower shell (4).

8. The leakage current fault detection device for electromechanical installation according to claim 7, characterized in that: The number of the upper corner seat (82), spring (83) and lower corner seat (85) are four in total. One upper corner seat (82), one spring (83) and one lower corner seat (85) form a group, and the four groups are respectively set at the four corners of the upper shell (3) and the lower shell (4).

9. The leakage current fault detection device for electromechanical installation according to claim 7, characterized in that: The upper shell (3) has a vertically arranged guide strip (81) fixed on its inner wall, and the lower shell (4) has a third sliding groove (84) that is adapted to the guide strip (81) fixed on its inner wall. The lower end of the third sliding groove (84) is fixedly connected to the partition (43). The lower end of the guide strip (81) extends into the third sliding groove (84) and can slide up and down in the third sliding groove (84).

10. A method for detecting leakage current faults in electromechanical installations, using the detection equipment as described in any one of claims 1 to 9, characterized in that, The detection method includes the following steps: S101: The operator holds the upper housing of the testing equipment, makes good contact with the conductive part at the tail with his / her fingers, and then puts the metal body (2) of the pen tip against the part to be tested. Under the action of the contact pressure, the clamping structure (6), the base (5) and the lower shell (4) will overcome the elastic force of the elastic retraction structure (8) and move backward relative to the upper housing (3). The elastic retraction structure (8) is in a compressed state. The operator observes the indicator window of the test pen (1). If the neon tube is lit, it is confirmed that there is a voltage to ground at this position of the electromechanical equipment, and there is a leakage fault. S102: By rotating the anti-slip knob of the worm gear (71) on the rotary locking structure (7), the rotary locking structure (7) will drive the clamping arm (64) in the clamping structure (6) to move and make the two clamping arms (64) clamp the part to be tested and form a tight friction force between them. The two clamping arms (64) firmly connect the testing device to the part to be tested. Even if the operator releases the test pen (1), under the combined action of the mechanical self-locking of the rotary locking structure (7) and the pressure provided by the elastic retraction structure (8), the metal body (2) of the pen tip can still maintain reliable electrical contact with the part to be tested. S103: When the operator operates the circuit breaker, live contactor or disconnects each branch connection in the distribution box, and tests are required after each operation, the operator should contact the conductive part at the tail of the test pen (1) according to the test requirements and observe the indicator light status of the test pen (1). The operator can then determine whether there is a voltage to ground at the part to be tested. S104: After finding the fault point and completing the repair, the operator can make good contact with the conductive part at the tail of the testing equipment again and observe the test pen (1) to confirm that its neon tube has been completely extinguished, indicating that the leakage hazard has been eliminated; rotate the worm (71) of the reverse rotation locking structure (7) to release the clamp, so that the metal body (2) of the pen tip is separated from the part to be tested, and the testing equipment is reset under the reset action of the elastic retraction structure (8).

Images