Current measuring device for electromagnetic pulse testing

Abstract

This invention provides a current measuring device for electromagnetic pulse testing, comprising: a first ring body, a second ring body, a clamping device, a handle, a handheld part, and a detection device. Both the first and second ring bodies are C-shaped, with the first ring body rotatably disposed within the second ring body. The handheld part is disposed on the outer peripheral wall of the second ring body. A through-hole is provided on the second ring body near the handheld part, and the handle slidably passes through the through-hole and connects to the outer peripheral wall of the first ring body. When the handle is near the handheld part, it drives the first ring body to rotate forward, so that the opening of the first ring body corresponds to the opening of the second ring body. The clamping device accommodates a wire, and when the handle is away from the handheld part, it drives the first ring body to rotate in the opposite direction, so that the opening of the first ring body is placed within the second ring body. The clamping device clamps the wire, and the detection device measures the magnetic field around the wire to calculate the current. This invention ensures that the wire is placed at the center of the first ring body, guaranteeing a symmetrical spatial magnetic field distribution and reducing measurement errors.

Description

Technical Field

[0001] This invention relates to the field of current measurement technology, and more specifically, to a current measurement device for electromagnetic pulse testing. Background Technology

[0002] Clamp-on ammeters are widely used for AC current detection and transient current monitoring in strong electromagnetic pulse environments due to their convenience of non-contact measurement. However, existing clamp-on ammeters have significant drawbacks: when the conductor being measured is not strictly centered in the clamp jaws, the spatial magnetic field distribution generated by the conductor current becomes asymmetrical, causing nonlinear attenuation of the magnetic flux coupled to the Hall element or induction coil. When measuring small currents or capturing rapidly changing strong electromagnetic pulse signals, the amplitude and phase errors caused by conductor eccentricity are prominent. In scenarios with strong electromagnetic interference or where accurate assessment of equipment transient immunity is required, these errors are more easily amplified and difficult to identify.

[0003] To address the aforementioned shortcomings, traditional solutions include improving the mechanical precision of the clamp body or using soft magnetic materials for compensation. However, these solutions are limited by processing costs, temperature stability, and frequency response characteristics. In particular, when facing high-frequency and high-intensity electromagnetic pulses, it is difficult to fundamentally improve the linearity of the magnetic field sensitive area and the consistency of dynamic response.

[0004] Furthermore, the eddy current effect generated by alternating magnetic fields (especially complex magnetic fields containing rich harmonic or pulse components) in asymmetric magnetic circuits further interferes with the accuracy of phase measurement, causes errors in power factor analysis, and significantly affects the accurate assessment of the equipment's anti-interference performance under real electromagnetic environments (such as lightning strikes, switching surges, EFTs, etc.). This structural defect severely restricts the reliability of clamp meters in demanding scenarios such as precision power monitoring, condition diagnosis of new energy power generation systems, strong electromagnetic pulse tolerance testing of key equipment, and system-level anti-interference performance verification. Summary of the Invention

[0005] In view of this, the present invention proposes a current measuring device for electromagnetic pulse testing, which aims to solve the problem in the prior art where the conductor under test is not placed in the center of the clamp in a clamp meter, resulting in an asymmetrical distribution of the spatial magnetic field.

[0006] This invention proposes a current measuring device for electromagnetic pulse testing. The device includes: a first ring body, a second ring body, a clamping device, a handle, a handheld part, and a detection device. Both the first and second ring bodies are C-shaped. The first ring body is rotatably disposed within the second ring body. The handheld part is disposed on the outer peripheral wall of the second ring body. A through hole of a predetermined length is provided on the second ring body near the handheld part. The handle is slidably inserted through the through hole and connected to the outer peripheral wall of the first ring body. The handle is used to drive the first ring body to rotate forward when it is near the handheld part, so that the opening of the first ring body corresponds to the opening of the second ring body, and to drive the first ring body to rotate in the reverse direction when it is away from the handheld part, so that the opening of the first ring body is placed within the second ring body. The clamping device is disposed on the first ring body and is used to be in an open state when the opening of the first ring body corresponds to the opening of the second ring body to accommodate the wire, and in a clamped state when the opening of the first ring body is placed within the second ring body to clamp the wire. The detection device is disposed between the first and second ring bodies and is used to measure the magnetic field around the wire when the opening of the first ring body is placed within the second ring body to calculate the current.

[0007] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, the clamping device includes: multiple clamping mechanisms; wherein each clamping mechanism is arranged at intervals along the circumference of the first ring body; each clamping mechanism includes: a synchronizing rod and two clamping structures; wherein the two clamping structures are respectively arranged on both sides of the first ring body, and the two ends of the synchronizing rod are connected to the two clamping structures in a one-to-one correspondence, so as to drive the two clamping structures to move synchronously.

[0008] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, each clamping structure includes: a positioning rod, a lever, a spring rod, and an arc-shaped clamping plate; wherein, the positioning rod is disposed on the outer wall of the first ring body; the first end of the lever is connected to one end of the synchronizing rod, the second end of the lever is perpendicularly connected to the first end of the spring rod, the second end of the spring rod is connected to the arc-shaped clamping plate, and the lever is rotatably connected to the positioning rod near the first end; the outer peripheral wall of the second ring body is provided with a limiting groove recessed towards the first ring body, and the synchronizing rod is slidably disposed in the limiting groove.

[0009] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, each clamping mechanism further includes a reset structure; wherein the reset structure is disposed between the second ring body and the first ring body, and is used to drive the first ring body to rotate in the opposite direction.

[0010] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, the reset structure includes: a reset rod, a reset spring, and a mounting rod; wherein, the outer peripheral wall of the second ring body has a strip-shaped hole penetrating the second ring body; the reset rod is disposed on the outer peripheral wall of the first ring body and slidably placed in the strip-shaped hole; the mounting rod is disposed in the strip-shaped hole; and the reset spring is disposed between the mounting rod and the reset rod.

[0011] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, the detection device includes: a C-shaped first magnetic core, an arc-shaped second magnetic core, a driving mechanism, and two Hall elements; wherein, the first magnetic core is disposed inside the first ring body; the inner wall of the second ring body near the opening has a receiving cavity, and the second magnetic core is slidably placed in the receiving cavity; the driving mechanism is connected to the second magnetic core and is used to drive the second magnetic core to move towards the first ring body when the first ring body rotates in the reverse direction so that the second magnetic core is engaged in the opening of the first ring body, and to drive the second magnetic core to be placed in the receiving cavity when the first ring body rotates in the forward direction; the two Hall elements are respectively disposed at both ends of the second magnetic core.

[0012] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, the driving mechanism includes: a cover, an elastic telescopic rod, and at least one slider; wherein, the cover is disposed outside the second magnetic core; the elastic telescopic rod is disposed between the cover and the bottom wall of the receiving cavity; the side of the cover away from the opening of the second ring body is inclined and has at least one groove; each slider is disposed on the end face of the opening end of the first ring body and slides in correspondence with each groove.

[0013] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, each clamping mechanism further includes a cleaning structure; wherein the cleaning structure is disposed on the outside of one of the clamping structures to clean impurities on the wire; the cleaning structures in each clamping mechanism are all located on the same side of the first ring body.

[0014] Furthermore, in the aforementioned current measuring device for electromagnetic pulse testing, each chip removal structure includes: an extension plate, an arc-shaped shovel plate, and a magnet; wherein, the first end of the extension plate is connected to the arc-shaped clamping plate, the second end of the extension plate is connected to the first end of the arc-shaped shovel plate, and the magnet is disposed on the outer wall of the arc-shaped shovel plate; the outer wall of the arc-shaped shovel plate gradually slopes inward from the first end to the second end.

[0015] Furthermore, the aforementioned current measuring device for electromagnetic pulse testing also includes: a working mechanism disposed between the handle and the handheld part; wherein the working mechanism includes: a sleeve, a connecting rod, a guide ring, and a pull rope; wherein the sleeve is disposed at the end of the handheld part away from the second ring body, and the connecting rod is detachably connected to the sleeve; the guide ring is disposed on the side wall of the connecting rod facing the handle; the pull rope is connected to the handle and passes through the guide ring.

[0016] In this invention, both the first and second rings are C-shaped. The handle is slidably inserted through a hole in the second ring and connected to the first ring. When the handle is close to the handhold, it drives the first ring to rotate forward so that the opening of the first ring aligns with the opening of the second ring. At this time, the clamping device is in an open state to accommodate the wire. When the handle is away from the handhold, it drives the first ring to rotate in the reverse direction so that the opening of the first ring is placed inside the second ring. At this time, the clamping device clamps the wire, and the detection device measures the magnetic field around the wire and then calculates the current. In this way, the wire is clamped by the clamping device after being placed inside the first ring, so that the wire is placed at the center of the first ring. This ensures that the spatial magnetic field distribution generated by the wire current is symmetrical, prevents nonlinear attenuation of magnetic flux, reduces measurement error, improves the accuracy of current measurement, and can accurately evaluate the anti-interference performance of the device in a real electromagnetic environment. This solves the problem in the prior art where the wire being measured is not placed at the center of the clamp jaws in the clamp meter, resulting in an asymmetrical spatial magnetic field distribution. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a current measuring device for electromagnetic pulse testing provided in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the clamping mechanism in the current measuring device for electromagnetic pulse testing provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the clamping mechanism from another perspective in the current measuring device for electromagnetic pulse testing provided in an embodiment of the present invention.

[0021] Figure 4 A schematic diagram of the detection device in the current measuring device for electromagnetic pulse testing provided in this embodiment of the invention;

[0022] Figure 5 A schematic diagram of the structure of the second magnetic core in the current measuring device for electromagnetic pulse testing provided in an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of the working mechanism in the current measuring device for electromagnetic pulse testing provided in an embodiment of the present invention;

[0024] Figure 7This is a schematic diagram of the chip removal structure in the current measuring device for electromagnetic pulse testing provided in an embodiment of the present invention. Detailed Implementation

[0025] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] See Figures 1 to 7 The figure shows a preferred structure of the current measuring device for electromagnetic pulse testing in this embodiment. As shown, the current measuring device for electromagnetic pulse testing includes: a first ring body 1, a second ring body 2, a clamping device, a handle 3, a handheld part 4, and a detection device 6. Both the first ring body 1 and the second ring body 2 are C-shaped. The first ring body 1 is rotatably disposed within the second ring body 2. Specifically, the first ring body 1 is fitted inside the second ring body 2, and the first ring body 1 can rotate freely within the second ring body 2.

[0027] The handle 4 is disposed on the outer peripheral wall of the second ring body 2. Specifically, the handle 4 is connected to the outer peripheral wall of the second ring body 2. The C-shaped opening of the second ring body 2 faces to one side, and the handle 4 is positioned below the opening of the second ring body 2 (relative to the C-shaped opening of the second ring body 2). Figure 1 In other words).

[0028] A through hole 21 is provided on the second ring body 2 near the handle part 4. The through hole 21 is located below the opening of the second ring body 2 and is located near the handle part 4. The through hole 21 has a preset length, which can be determined according to actual conditions. This embodiment does not impose any restrictions on this. The length direction of the through hole 21 extends along the circumferential direction of the outer peripheral wall of the second ring body 2.

[0029] The handle 3 is slidably inserted through the through hole 21. The first end of the handle 3 is connected to the outer peripheral wall of the first ring body 1, and the second end of the handle 3 is a free end for user operation. The handle 3 is used to drive the first ring body 1 to rotate forward when it is close to the hand-held part 4, so that the opening of the first ring body 1 corresponds to the opening of the second ring body 2, and to drive the first ring body 1 to rotate in the reverse direction when it is away from the hand-held part 4, so that the opening of the first ring body 1 is placed inside the second ring body 2. Specifically, the handle 3 is also placed below the opening of the second ring body 2, that is, the handle 3 and the hand-held part 4 are on the same side. When the user pinches the second end of the handle 3, causing the second end of the handle 3 to approach the hand-held part 4, since the handle 3 is connected to the first ring body 1, the movement of the handle 3 causes the first ring body 1 to rotate forward, and this forward rotation causes the opening of the first ring body 1 to correspond to the opening of the second ring body 2. The user drives the second end of the handle 3 to move away from the hand part 4, causing the first ring body 1 to rotate in the opposite direction. This reverse rotation causes the C-shaped opening of the first ring body 1 to be placed inside the second ring body 2, that is, the opening of the first ring body 1 is closed by the second ring body 2.

[0030] A clamping device is disposed on the first ring body 1. When the opening of the first ring body 1 corresponds to the opening of the second ring body 2, the clamping device is in an open state to accommodate the wire. That is, the wire can be placed inside the first ring body 1 after passing through the opening of the first ring body 1 and the opening of the second ring body 2, and the first ring body 1 then accommodates the wire. When the opening of the first ring body 1 is placed inside the second ring body 2, the clamping device is in a clamping state to clamp the wire.

[0031] The detection device 6 is disposed between the first ring body 1 and the second ring body 2. The detection device 6 is used to measure the magnetic field around the conductor when the opening of the first ring body 1 is placed inside the second ring body 2, so as to calculate the current.

[0032] When detecting the current intensity of a conductor, the user holds the handheld part 4 and brings the device close to the conductor. Then, the user squeezes the handle 3, bringing it closer to the handheld part 4. At this time, the handle 3 causes the first ring 1 to rotate clockwise within the second ring 2. The C-shaped opening of the first ring 1 rotates to the C-shaped opening of the second ring 2, aligning the openings of the first and second rings. This allows the conductor to enter the first ring 1 through both openings for detection. During the clockwise rotation of the first ring 1, the clamping device gradually opens. After the conductor enters the first ring 1, the user releases the handle 3, moving it away from the handheld part 4. The handle 3 then causes the first ring 1 to rotate counter-clockwise within the second ring 2, bringing the opening of the first ring 1 into the second ring 2. During the counter-clockwise rotation of the first ring 1, the clamping device gradually clamps the conductor. At this point, the detection device 6 measures the magnetic field around the conductor and calculates the current.

[0033] As can be seen, in this embodiment, both the first ring 1 and the second ring 2 are C-shaped. The handle 3 is slidably inserted through the through hole 21 on the second ring 2 and connected to the first ring 1. When the handle 3 is close to the hand-held part 4, it drives the first ring 1 to rotate in the forward direction so that the opening of the first ring 1 corresponds to the opening of the second ring 2. At this time, the clamping device is in an open state to accommodate the wire. When the handle 3 is away from the hand-held part 4, it drives the first ring 1 to rotate in the reverse direction so that the opening of the first ring 1 is placed inside the second ring 2. At this time, the clamping device clamps the wire, and the detection device 6 measures the magnetic field around the wire and then calculates the current. In this way, the wire is clamped by the clamping device after being placed inside the first ring 1, so that the wire is placed at the center position of the first ring 1. This ensures that the spatial magnetic field distribution generated by the wire current is symmetrical, prevents nonlinear attenuation of magnetic flux, reduces measurement error, improves the measurement accuracy of current, and can accurately evaluate the anti-interference performance of the device in a real electromagnetic environment. This solves the problem in the prior art where the measured wire is not placed at the center position of the clamp jaws, resulting in an asymmetrical spatial magnetic field distribution.

[0034] See Figures 1 to 3 In the above embodiments, the clamping device includes a plurality of clamping mechanisms 5. Each clamping mechanism 5 is arranged at intervals along the circumference of the first ring body 1, preferably evenly distributed along the circumferential direction of the first ring body 1.

[0035] Each clamping mechanism 5 includes a synchronizing rod 51 and two clamping structures 52. The two clamping structures 52 are respectively located on the left and right sides of the first ring body 1, and are symmetrically arranged. The two ends of the synchronizing rod 51 are connected to the two clamping structures 52 one-to-one, and the synchronizing rod 51 drives the two clamping structures 52 to move synchronously.

[0036] Each clamping structure 52 includes: a positioning rod 521, a lever 522, a spring rod 523, and an arc-shaped clamping plate 524. The positioning rod 521 is located on the outer wall of the first ring body 1. The first end of the lever 522 is connected to one end of the synchronizing rod 51, and the second end of the lever 522 is perpendicularly connected to the first end of the spring rod 523. The second end of the spring rod 523 is connected to the arc-shaped clamping plate 524, which is used to clamp the wire. The lever 522 is rotatably connected to the positioning rod 521 near its first end, preferably with a hinged connection. Specifically, the positioning rod 521 is fixedly connected to one side wall of the first ring body 1, and the lever 522 has a through hole near its first end. The diameter of this through hole is slightly larger than the diameter of the positioning rod 521, allowing the lever 522 to rotate around the positioning rod 521. The through hole is located in the middle section of the lever 522. The spring rod 523 has a preset elasticity to clamp the wire using elasticity. Furthermore, the second end of the spring rod 523 points towards the center of the first ring body 1.

[0037] A limiting groove 22 is formed on the outer peripheral wall of the second ring body 2, and the limiting groove 22 is recessed towards the first ring body 1. Specifically, the limiting groove 22 is formed from the outer peripheral wall of the second ring body 2 and recessed towards the first ring body 1, and the limiting groove 22 extends along the diameter direction of the second ring body 2. The synchronizing rod 51 is slidably disposed in the limiting groove 22 so that the synchronizing rod 51 slides in the limiting groove 22 along its depth direction. In a specific implementation, one end of the synchronizing rod 51 is connected to the first end of the lever 522 in a clamping structure 52, and the other end of the synchronizing rod 51 is connected to the first end of the lever 522 in another clamping structure 52.

[0038] When the user squeezes the handle 3, the handle 3 moves close to the hand-held part 4. The handle 3 slides in the through hole 21, causing the first ring 1 to rotate forward in the second ring 2. Since the positioning rod 521 is connected to the first ring 1, the rotation of the first ring 1 causes the positioning rod 521 to rotate, causing the positioning rod 521 to gradually move away from the limiting groove 22. This, in turn, causes the lever 522 to rotate around the positioning rod 521. Since the synchronizing rod 51 can only slide in the limiting groove 22, the rotation of the lever 522 causes the synchronizing rod 51 to move from outside the limiting groove 22 to inside the limiting groove 22. The spring rod 523 and the arc-shaped clamping plate 524 move away from the center of the first ring 1. When the first ring 1 rotates forward until the opening of the first ring 1 corresponds to the opening of the second ring 2, the arc-shaped clamping plate 524 moves to a position parallel to the tangential direction of the first ring 1. At this time, the user controls the handheld part 4 to approach the wire, and the wire enters the first ring 1 after passing through the opening of the second ring 2 and the opening of the first ring 1.

[0039] The user moves the handle 3 away from the handheld part 4, causing the handle 3 to rotate the first ring 1 in the opposite direction. This, in turn, causes the positioning rod 521 to gradually approach the limiting groove 22, which in turn causes the lever 522 to rotate. The synchronizing rod 51 moves from inside the limiting groove 22 to outside the limiting groove 22, and the spring rod 523 and the arc-shaped clamping plate 524 move towards the center of the first ring 1. When the first ring 1 rotates in the opposite direction until its opening is inside the second ring 2, the arc-shaped clamping plate 524 moves to the center of the first ring 1 and comes into contact with the wire. The spring rod 523 uses its elastic contraction to clamp the wire, and the spring force of the spring rod 523 clamps the wire. In this way, the arc-shaped clamping plates 524 in each clamping structure 52 cooperate to push the wire towards the center of the first ring 1 and finally limit the wire to the center of the first ring 1. The magnetic field of the current-carrying wire is detected by the detection device 6, and the current is calculated by measuring the magnetic field around the wire.

[0040] A C-shaped first ring 1 is positioned inside a second ring 2. During testing, the opening of the first ring 1 is sealed by the inner wall of the second ring 2, preventing the wire from slipping out of the first ring 1 due to vibrations. This ensures the wire remains stably centered within the first ring 1. Furthermore, the clamping device automatically clamps and releases as the handle 3 moves closer to or further from the handheld part 4, eliminating the need for manual operation. This improves the efficiency of wire current detection and mitigates the problem of uneven magnetic field distribution caused by the wire not being centered on the magnetic core, leading to large errors in the test results. This enhances the accuracy of the test results.

[0041] See Figures 1 to 3 Each clamping mechanism 5 further includes a reset structure. The reset structure is located between the second ring 2 and the first ring 1, and is used to drive the first ring 1 to rotate in the opposite direction.

[0042] The reset structure includes a reset rod 53, a reset spring 54, and a mounting rod 55. Specifically, the outer peripheral wall of the second ring body 2 has a through-hole 23. The through-hole 23 extends circumferentially along the outer peripheral wall of the second ring body 2 and has a preset length, which can be determined based on actual conditions; this embodiment does not impose any limitations on this.

[0043] The reset rod 53 is disposed on the outer peripheral wall of the first ring body 1, and the reset rod 53 is slidably placed in the strip hole 23. Specifically, the position of the reset rod 53 corresponds to the position of the strip hole 23, the reset rod 53 extends towards the second ring body 2 so that the reset rod 53 is placed in the strip hole 23, and the reset rod 53 can slide in the strip hole 23.

[0044] The mounting rod 55 is disposed within the slotted hole 23. Specifically, the mounting rod 55 is fixed to one side of the slotted hole 23, that is, the mounting rod 55 is fixed to the second ring body 2. The mounting rod 55 and the reset rod 53 are disposed opposite to each other and spaced apart.

[0045] The reset spring 54 is located between the mounting rod 55 and the reset rod 53, that is, one end of the reset spring 54 is connected to the mounting rod 55, and the other end of the reset spring 54 is connected to the reset rod 53.

[0046] When the user squeezes handle 3, bringing it close to the handhold part 4, the handle 3 slides within the through hole 21, causing the first ring body 1 to rotate forward. This forward rotation of the first ring body 1 causes the reset rod 53 to move away from the mounting rod 55 within the slot 23. The movement of the reset rod 53 extends the reset spring 54. When it is necessary to move the handle 3 away from the handhold part 4, the user releases the handle 3. Under the action of the elastic restoring force, the reset spring 54 causes the reset rod 53 to move closer to the mounting rod 55 within the slot 23. This movement of the reset rod 53 causes the first ring body 1 to rotate in the opposite direction, so that the opening of the first ring body 1 is placed within the second ring body 2.

[0047] See Figure 1 , Figure 2 , Figure 6 and Figure 7 Each clamping mechanism 5 further includes a chip removal structure 56. The chip removal structure 56 is disposed on the outside of one of the clamping mechanisms 52 and is used to clean impurities on the wire.

[0048] The chip removal structure 56 in each clamping mechanism 5 is located on the same side of the first ring body 1.

[0049] Each chip removal structure 56 includes an extension plate 561, an arc-shaped scraper plate 562, and a magnet 563. The first end of the extension plate 561 is connected to the arc-shaped clamping plate 524, preferably in a detachable manner, such as by bolts. The second end of the extension plate 561 is connected to the first end of the arc-shaped scraper plate 562, and the magnet 563 is disposed on the outer wall of the arc-shaped scraper plate 562.

[0050] The outer wall of the arc-shaped shovel 562 gradually slopes inward from the first end to the second end, so that the arc-shaped shovel 562 removes impurities from the wire, and the removed impurities are attracted by the magnet 563.

[0051] During measurement, the clamping device retracts, that is, each arc-shaped clamping plate 524 moves closer to the center of the first ring body 1. Each arc-shaped clamping plate 524 drives the extension plate 561 to retract, so that the arc-shaped scraper plate 562 fits against the outer wall of the wire. During the movement of the device, the wire can be straightened. The device is pushed on the wire by the hand-held part 4. The chip removal structure 56 is located on the clamping structure 52 in the direction of travel of the device. The arc-shaped scraper plate 562 removes iron filings and magnetic impurities adhering to the wire. The magnet 563 removes fallen iron filings and magnetic impurities. Impurities are adsorbed. Iron filings or magnetic impurities can affect the detection results of clamp current meters because they may interfere with the magnetic field distribution around the conductor being measured, leading to measurement errors. If iron filings adhere to the surface of the ring or near the conductor, they may change the magnetic flux, causing the sensing signal of the detection device 6 to be distorted, resulting in readings that are too high, too low, or unstable. In addition, magnetic impurities may also cause the ring to not close tightly, further reducing the measurement accuracy. Therefore, cleaning the impurities attached to the conductor by the cleaning structure 56 can avoid interference from magnetic materials.

[0052] As can be seen, in this embodiment, the clamping device has a simple structure and is easy to implement.

[0053] See Figure 1 , Figure 4 and Figure 5 In the above embodiments, the detection device 6 includes: a first magnetic core 61, a second magnetic core 62, a driving mechanism, and two Hall elements 63. The first magnetic core 61 is C-shaped and is disposed inside the first ring body 1. Specifically, the first ring body 1 has a cavity inside, and the first magnetic core 61 is disposed within the cavity of the first ring body 1, with the first magnetic core 61 and the first ring body 1 being concentrically arranged.

[0054] A receiving cavity 24 is formed on the inner wall of the second ring body 2 near the opening. The second magnetic core 62 is arc-shaped and slidably placed within the receiving cavity 24. Specifically, the receiving cavity 24 is located near the opening of the second ring body 2 and is positioned above the opening of the second ring body 2. The receiving cavity 24 is formed on the inner peripheral wall of the second ring body 2 towards the first ring body 1 and recessed towards the outer peripheral wall of the second ring body 2. The opening of the receiving cavity 24 faces the first ring body 1. The shape of the second magnetic core 62 matches the shape of the receiving cavity 24.

[0055] The driving mechanism is connected to the second magnetic core 62. The driving mechanism drives the second magnetic core 62 to move towards the first ring body 1 when the first ring body 1 rotates in the reverse direction, so that the second magnetic core 62 engages within the opening of the first ring body 1. When the first ring body 1 rotates in the forward direction, the driving mechanism drives the second magnetic core 62 to be placed within the receiving cavity 24. Specifically, during the process of the first ring body 1 rotating in the reverse direction so that the opening of the first ring body 1 is placed within the second ring body 2, when the opening of the first ring body 1 approaches the receiving cavity 24, the driving mechanism drives the second magnetic core 62 to slide out of the receiving cavity 24 and move towards the first ring body 1. The second magnetic core 62 then engages within the opening of the first ring body 1, thus blocking the first ring body 1 and positioning it. Furthermore, the first magnetic core 61 and the second magnetic core 62 cooperate, with the second magnetic core 62 entering the opening of the first magnetic core 61, forming an open-loop Hall clamp meter. During the forward rotation of the first ring 1, aligning its opening with the opening of the second ring 2, the drive mechanism drives the second magnetic core 62 to slide into the receiving cavity 24. The second magnetic core 62 then no longer obstructs the first ring 1, allowing it to rotate within the second ring 2. When the wire enters the first ring 1 and its opening enters the second ring 2, the drive mechanism drives the second magnetic core 62 from the receiving cavity 24 into the opening of the first magnetic core 61, thus forming an open-loop Hall clamp meter with the first magnetic core 61.

[0056] Two Hall elements 63 are respectively disposed at the two ends of the second magnetic core 62. After the opening of the first ring 1 is sealed by the second ring 2, there is an air gap between the two ends of the first magnetic core 61 and the two ends of the second magnetic core 62, and the two Hall elements 63 are respectively placed in the corresponding air gap.

[0057] After the second magnetic core 62 enters the opening of the first magnetic core 61, two Hall elements 63 are respectively installed in the air gap of the end face of the second magnetic core 62, with the sensitive surface facing the end face of the first magnetic core 61. Specifically, the distance between the end faces of the first magnetic core 61 and the second magnetic core 62 is 0.1 to 0.5 mm, forming a high magnetic reluctance air gap. The Hall elements 63 are placed in this high magnetic reluctance air gap, and the difference in magnetic field strength between the end faces of the first magnetic core 61 and the second magnetic core 62 is detected synchronously by the two Hall elements 63.

[0058] See also Figure 1 , Figure 4 and Figure 5The driving mechanism includes a cover 64, an elastic telescopic rod 65, and at least one slider 66. The cover 64 covers the exterior of the second magnetic core 62. The elastic telescopic rod 65 is placed inside the receiving cavity 24 and is positioned between the cover 64 and the bottom wall of the receiving cavity 24. Specifically, the bottom wall of the receiving cavity 24 is a side wall corresponding to the opening of the receiving cavity 24. One end of the elastic telescopic rod 65 is connected to the bottom wall of the receiving cavity 24, and the other end is connected to the cover 64. The elastic telescopic rod 65 is used to push the cover 64 into the opening of the first ring 1 after the opening of the first ring 1 is connected to the receiving cavity 24.

[0059] The side of the cover 64 away from the opening of the second ring body 2 is inclined, and at least one groove 641 is provided on the inclined side of the cover 64.

[0060] Each slider 66 is disposed on the end face of the opening end of the first ring body 1. Specifically, each slider 66 is opened on the end face of the upper end of the opening of the first ring body 1. Furthermore, each slider 66 is spaced apart, and each slider 66 corresponds one-to-one with each slide groove 641. Each slider 66 slides into the corresponding slide groove 641 so that when the opening of the first ring body 1 moves closer to the opening of the second ring body 2, the slider 66 pushes the cover 64 into the receiving cavity 24.

[0061] Specifically, the side of the cover 64 away from the opening of the second ring 2 is inclined towards the other side of the cover 64, i.e., inward, thus forming an inclined surface. At least one groove 641 is provided on this inclined surface. Each slider 66 has a right-angled triangular cross-section, with the side of each slider 66 away from the first ring 1 being the hypotenuse. Therefore, the hypotenuse of each slider 66 corresponds to the inclined surface of the cover 64, and each slider 66 slides into the corresponding groove 641 on the inclined surface, causing the slider 66 to push the cover 64 into the receiving cavity 24, and the elastic telescopic rod 65 to retract. Two Hall elements 63 are respectively disposed at the two ends of the cover 64.

[0062] During the forward rotation of the first ring 1, aligning its opening with the opening of the second ring 2, the slider 66 at the end of the first ring 1 slides within the groove 641, pushing the inclined surface of the cover 64 and causing it to move into the receiving cavity 24. This allows the second magnetic core 62 to be placed within the cavity 24, thus preventing it from obstructing the rotation of the first ring 1. After passing through the cavity 24, the first ring 1 aligns with the opening of the second ring 2. At this point, the elastic telescopic rod 65 is compressed. When the slider 66 completely exits the groove 641, the outer ring surface of the first ring 1 adheres to the inner ring surface of the cover 64, and the cover 64 enters the receiving cavity 24. The first ring 1 rotates at the opening of the cavity 24, ultimately aligning its opening with the opening of the second ring 2, facilitating the entry of wires into the first ring 1 through the openings of the first and second rings 2. During the process of the first ring 1 rotating in the opposite direction so that the opening of the first ring 1 is placed inside the second ring 2, the elastic telescopic rod 65 pushes the cover 64 towards the first ring 1 under the action of elastic restoring force, so that the cover 64 slides out of the receiving cavity 24 and moves towards the first ring 1. The cover 64 is engaged in the opening of the first ring 1, that is, the cover 64 blocks the first ring 1, thereby positioning the first ring 1.

[0063] In specific implementation, a clamping mechanism 5 includes a reset structure. In this way, the reset springs 54 in multiple clamping mechanisms 5 can provide tension so that the second magnetic core 62 can be aligned with the opening of the first ring body 1 and the receiving cavity 24, making it convenient for the second magnetic core 62 to enter the opening of the first magnetic core 61.

[0064] See Figure 1 , Figure 6 and Figure 7 In the above embodiments, the current measuring device for electromagnetic pulse testing further includes a working mechanism 7. The working mechanism 7 is disposed between the handle 3 and the handheld part 4.

[0065] The working mechanism 7 includes: a sleeve 71, a connecting rod 72, a guide ring 73, and a pull rope 74. The sleeve 71 is located at the end of the handheld part 4 away from the second ring body 2. The connecting rod 72 is detachably connected to the sleeve 71. Preferably, the sleeve 71 is a threaded tube, and the outer wall of the connecting rod 72 is threaded, with the connecting rod 72 screwed to the threaded tube.

[0066] The guide ring 73 is disposed on the side wall of the connecting rod 72 facing the handle 3.

[0067] The first end of the pull cord 74 is connected to the handle 3, the pull cord 74 is threaded through the guide ring 73, and the second end of the pull cord 74 is the user's control end.

[0068] When it is necessary to measure the current of a high-altitude conductor using this device, connect the connecting rod 72 to the sleeve 71. The user holds the connecting rod 72 and moves the device closer to the high-altitude conductor. Then, pull the pull rope 74. The first end of the pull rope 74 pulls the handle 3 towards the handheld part 4, thereby causing the first ring 1 to rotate within the second ring 2. This causes the opening of the first ring 1 to rotate towards the opening of the second ring 2 until the openings of the first ring 1 and the second ring 2 are connected. Moving the connecting rod 72 causes it to move the device closer to the conductor. The conductor enters the first ring 1 through the openings of the first ring 1 and the second ring 2. Releasing the pull rope 74 causes the first ring 1 to rotate in the opposite direction and return to its original position. Holding the connecting rod 72, the user moves the device along the conductor, thus allowing the overall current of the conductor to be detected by moving the device.

[0069] In summary, in this embodiment, both the first ring 1 and the second ring 2 are C-shaped. The handle 3 is slidably inserted through the through hole 21 on the second ring 2 and connected to the first ring 1. When the handle 3 is close to the hand-held part 4, it drives the first ring 1 to rotate in the forward direction so that the opening of the first ring 1 corresponds to the opening of the second ring 2. At this time, the clamping device is in an open state to accommodate the wire. When the handle 3 is away from the hand-held part 4, it drives the first ring 1 to rotate in the reverse direction so that the opening of the first ring 1 is placed inside the second ring 2. At this time, the clamping device clamps the wire, and the detection device 6 measures the magnetic field around the wire and then calculates the current. In this way, after the wire is placed inside the first ring 1, it is clamped by the clamping device, so that the wire is placed at the center position of the first ring 1. This ensures that the spatial magnetic field distribution generated by the wire current is symmetrical, prevents nonlinear attenuation of magnetic flux, reduces measurement error, improves the measurement accuracy of current, and enables accurate evaluation of the anti-interference performance of the device in a real electromagnetic environment.

[0070] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0071] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A current measuring device for electromagnetic pulse testing, characterized in that, include: The device comprises a first ring body (1), a second ring body (2), a clamping device, a handle (3), a handheld part (4), and a detection device (6); wherein, Both the first ring body (1) and the second ring body (2) are C-shaped, and the first ring body (1) is rotatably disposed inside the second ring body (2); The hand-held part (4) is disposed on the outer peripheral wall of the second ring body (2). The second ring body (2) has a through hole (21) of a preset length near the hand-held part (4). The handle (3) is slidably disposed in the through hole (21) and connected to the outer peripheral wall of the first ring body (1). The handle (3) is used to drive the first ring body (1) to rotate forward when it is close to the hand-held part (4) so ​​that the opening of the first ring body (1) corresponds to the opening of the second ring body (2), and to drive the first ring body (1) to rotate in the opposite direction when it is away from the hand-held part (4) so ​​that the opening of the first ring body (1) is placed inside the second ring body (2). The clamping device is disposed on the first ring body (1) and is used to be in an open state when the opening of the first ring body (1) corresponds to the opening of the second ring body (2) to accommodate the wire, and in a clamping state when the opening of the first ring body (1) is placed inside the second ring body (2) to clamp the wire. The detection device (6) is disposed between the first ring body (1) and the second ring body (2) for measuring the magnetic field around the conductor when the opening of the first ring body (1) is placed inside the second ring body (2) in order to calculate the current; The clamping device includes: a plurality of clamping mechanisms (5); wherein, Each of the clamping mechanisms (5) is arranged at circumferential intervals along the first ring body (1); Each of the clamping mechanisms (5) includes: a synchronizing rod (51) and two clamping structures (52); wherein, the two clamping structures (52) are respectively disposed on both sides of the first ring body (1), and the two ends of the synchronizing rod (51) are connected to the two clamping structures (52) in a one-to-one correspondence, so as to drive the two clamping structures (52) to move synchronously; Each of the clamping structures (52) includes: a positioning rod (521), a lever (522), a spring rod (523), and an arc-shaped clamping plate (524); wherein, The positioning rod (521) is disposed on the outer side wall of the first ring body (1); The first end of the lever (522) is connected to one end of the synchronizing rod (51), the second end of the lever (522) is perpendicularly connected to the first end of the spring rod (523), the second end of the spring rod (523) is connected to the arc-shaped clamping plate (524), and the lever (522) is rotatably connected to the positioning rod (521) near the first end; The outer peripheral wall of the second ring (2) is provided with a limiting groove (22) that is recessed toward the first ring (1), and the synchronizing rod (51) is slidably disposed in the limiting groove (22); The detection device (6) includes: a C-shaped first magnetic core (61), an arc-shaped second magnetic core (62), a drive mechanism, and two Hall elements (63); wherein, The first magnetic core (61) is disposed inside the first ring body (1); The second ring (2) has a receiving cavity (24) on its inner wall near the opening, and the second magnetic core (62) is slidably placed in the receiving cavity (24); The driving mechanism is connected to the second magnetic core (62) and is used to drive the second magnetic core (62) to move toward the first ring body (1) when the first ring body (1) rotates in the reverse direction so that the second magnetic core (62) is engaged in the opening of the first ring body (1), and to drive the second magnetic core (62) to be placed in the receiving cavity (24) when the first ring body (1) rotates in the forward direction. The two Hall elements (63) are respectively disposed at both ends of the second magnetic core (62); The driving mechanism includes: a cover (64), an elastic telescopic rod (65), and at least one slider (66); wherein, The cover (64) is provided over the outside of the second magnetic core (62); The elastic telescopic rod (65) is disposed between the cover (64) and the bottom wall of the receiving cavity (24); The cover (64) is inclined on the side away from the opening of the second ring (2) and has at least one groove (641). Each of the sliders (66) is disposed on the end face of the opening end of the first ring body (1) and is slidably connected to each of the sliding grooves (641) in a one-to-one correspondence.

2. The current measuring device for electromagnetic pulse testing according to claim 1, characterized in that, Each of the clamping mechanisms (5) further includes: a reset structure; wherein, The reset structure is disposed between the second ring (2) and the first ring (1) and is used to drive the first ring (1) to rotate in the opposite direction.

3. The current measuring device for electromagnetic pulse testing according to claim 2, characterized in that, The reset structure includes: a reset rod (53), a reset spring (54), and a mounting rod (55); wherein, The outer peripheral wall of the second ring (2) is provided with a strip-shaped hole (23) that penetrates the second ring (2); The reset rod (53) is disposed on the outer peripheral wall of the first ring body (1) and is slidably placed in the strip hole (23); The mounting rod (55) is disposed within the strip hole (23); The reset spring (54) is disposed between the mounting rod (55) and the reset rod (53).

4. The current measuring device for electromagnetic pulse testing according to claim 1, characterized in that, Each of the clamping mechanisms (5) further includes: a chip removal structure (56); wherein, The cleaning structure (56) is disposed on the outside of one of the clamping structures (52) to clean impurities on the wire; The chip removal structure (56) in each of the clamping mechanisms (5) is located on the same side of the first ring body (1).

5. The current measuring device for electromagnetic pulse testing according to claim 4, characterized in that, Each of the aforementioned chip removal structures (56) includes: an extension plate (561), an arc-shaped scraper plate (562), and a magnet (563); wherein, The first end of the extension plate (561) is connected to the arc-shaped clamping plate (524), the second end of the extension plate (561) is connected to the first end of the arc-shaped shovel plate (562), and the magnet (563) is disposed on the outer wall of the arc-shaped shovel plate (562). The outer wall of the arc-shaped shovel (562) gradually slopes inward from the first end to the second end.

6. The current measuring device for electromagnetic pulse testing according to claim 1, characterized in that, Also includes: The working mechanism (7) is disposed between the handle (3) and the hand-held part (4); wherein, The working mechanism (7) includes: a sleeve (71), a connecting rod (72), a guide ring (73), and a pull rope (74); wherein, the sleeve (71) is located at one end of the hand-held part (4) away from the second ring body (2), and the connecting rod (72) is detachably connected to the sleeve (71); The guide ring (73) is disposed on the side wall of the connecting rod (72) facing the handle (3); The pull rope (74) is connected to the handle (3) and passes through the guide ring (73).

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