A portable three-channel current detector

Abstract

The application provides a portable three-channel current detector, and relates to the technical field of current detection.The portable three-channel current detector comprises an instrument, three wires on the instrument are connected with terminal units, the terminal unit comprises a lower shell connected with the wire, an upper shell connected with the lower shell, clamping assemblies arranged in two sliding holes of the upper shell, sliding frames arranged in the sliding holes of the clamping assemblies, two rotating cylinders arranged on the end plates of the sliding frames, swing rods arranged on the outer side end portions of the rotating cylinders, angle plates arranged on the end portions of the swing rods, sliding support plates arranged in the middle cavities of the two side plates of the angle plates, clamping rods arranged in the middle portions of the sliding support plates, and rubber pads arranged on the end portions of the clamping rods outside the angle plates and used for clamping the cables.When detection is performed, the four rubber pads of each clamping assembly clamp the cable at the same time, the cable is located in the center of the two semicircular pincers, and the cable is kept in a straight state, so that the detection error is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of current detection, and more particularly to a portable three-channel current detector. Background Art

[0002] Non-contact current detectors typically employ a jaw structure. Their operating principle is based on the law of electromagnetic induction. They accurately measure the current by detecting the induced electromotive force generated by the magnetic field surrounding the cable under test. In practice, the jaws can be flexibly opened to clamp the cable under test, allowing current measurement to be completed without disconnecting the circuit or directly contacting the metal parts of the cable. This non-contact measurement method not only does not interfere with the normal operation of the circuit under test, but also effectively avoids measurement errors and circuit failure risks caused by poor contact. It offers significant convenience and safety, making it particularly suitable for special applications where power outages or wiring removal are inconvenient.

[0003] In existing technical solutions, the conventional practice is to place the cable inside the jaws for current measurement. However, when the cable is not in the center of the jaws, it will cause uneven magnetic field distribution and unbalanced magnetic circuits, resulting in deviations in the coil induced electromotive force of the clamp-type current detector, and thus measurement errors. In addition, the placement of the cable is not straight, which will also introduce working errors. This is because the non-linear state of the cable will change the distribution of the magnetic field around it, making it no longer regularly and symmetrically distributed around the cable. As a result, the magnetic field gathered by the iron core of the clamp-type current detector becomes uneven, causing the coil induced electromotive force to be inaccurate, and ultimately causing deviations in the measurement results. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a portable three-channel current detector.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: a portable three-channel current detector, including an instrument, three wires are connected to the instrument, the ends of the three wires are connected to terminal units, the terminal unit includes a lower shell connected to the wires, the upper part of the lower shell is connected to the upper part, and the two short sides of the upper shell are provided with sliding holes; the two sliding holes of the upper shell are provided with clamping components, the clamping components include a sliding frame slidingly arranged in the sliding hole, the port of the sliding frame is provided with an end plate, two rotating drums are rotatably provided on the end plate, the outer end of the rotating drum is provided with a rocker for clamping the cable, a guide rod is inserted into the rotating drum, the guide rod is fixed on the fixed seat, and the fixed seat is fixed on the upper On the inner side surface of the shell, two sliding grooves are symmetrically provided on the guide rod, and the sliding grooves are composed of straight segments and oblique segments. The inner side surface of the rotating drum is provided with two slides that form a sliding match with the two sliding grooves respectively; a sliding cavity is provided in the middle of the end plates of the two clamping assemblies, and a circular sliding block is provided in the sliding cavity. A support rod is provided on the circular sliding block, and the support rod extends to the outside of the end plate. A square plate is provided on the support rod, and a spring 1 is provided on the outside of the support rod. The two sides of the spring 1 are respectively connected to the end plate and the square plate. Connecting plates are provided on the sides of the two support rods, and the support rod is rotatably connected to the upper end of the corresponding connecting plate. The lower ends of the two connecting plates are jointly rotatably connected to the middle plate, and the middle plate is connected to the telescopic shaft of the electric cylinder. The electric cylinder is fixed on the inner wall of the lower shell.

[0006] As a preferred technical solution of the present invention, the ends of the rocker arm are provided with angle plates, which are composed of two side plates perpendicular to each other. A middle cavity is provided in the two side plates of the angle plate, a sliding support plate is slidably provided in the middle cavity, and a spring 2 is provided in the middle cavity, and the two ends of the spring 2 are respectively connected to the inner side wall of the middle cavity and the sliding support plate, and a clamping rod is provided in the middle of the sliding support plate, which extends to the outside of the angle plate.

[0007] As a preferred technical solution of the present invention, the ends of the clamping rods located outside the angle plates are provided with rubber pads for clamping the cables.

[0008] As a preferred technical solution of the present invention, through holes are provided on the two long sides of the upper shell, and a swivel seat is provided inside the upper shell and at the through holes. A semicircular clamp is rotatably provided on the swivel seat, and the semicircular clamp extends to the outside of the upper shell through the through holes. The ends of the two semicircular clamps contact each other, and a torsion plate is provided at both ends of the rotating shaft of the semicircular clamp. An arc-shaped guide rod is fixed on the torsion plate, and the arc-shaped guide rod is slidably provided on a slide seat, which is fixed on the side wall of the swivel seat, and a spring three is provided on the outer sleeve of the arc-shaped guide rod, and the two ends of the spring three are respectively connected to the torsion plate and the slide seat.

[0009] As a preferred technical solution of the present invention, an L-shaped drive plate for driving the torsion plate to rotate is provided on the middle plate.

[0010] As a preferred technical solution of the present invention, the semicircular pliers are provided with a dust shield arc plate, the axis of the dust shield arc plate coincides with the axis of the semicircular pliers rotating shaft, a sealing frame is provided at the through hole of the upper shell, the semicircular pliers passes through the sealing frame, and the sealing frame is provided with an arc surface in contact with the dust shield arc plate.

[0011] As a preferred technical solution of the present invention, a rotational and sliding cooperation relationship is formed between the end plate and the rotating drum, and a spring four is provided on the outer sleeve of the rotating drum, and the two ends of the spring four are in contact with the rotating drum and the end plate respectively.

[0012] As a preferred technical solution of the present invention, the end of the slide groove is provided with a chamfer to facilitate the insertion of the slide.

[0013] The beneficial effects of the present invention compared with the prior art are: 1. When conducting detection, the present invention places the cable in the middle of the two angle plates of each group of clamping assemblies at the same time, so that the telescopic shaft of the electric cylinder contracts, driving the middle plate to move upward, and transmitting power through the two connecting plates, so that the support rods and end plates of the two clamping assemblies move synchronously outward, that is, the sliding frame slides outward in the sliding hole, and the sliding frame moves synchronously with the rotating drum, and the slide on the rotating drum slides in the sliding groove, and the slide slides from the oblique segment of the sliding groove to the straight segment, and the rotating drum rotates in the sliding frame. When the slide moves to the straight segment of the sliding groove, the four rubber pads of each group of clamping assemblies contact the cable at the same time, that is, the four rubber pads clamp the cable at the same time, so that the cable is located in the center of the two semicircular clamps, thereby reducing the detection error.

[0014] 2. The telescopic shaft of the electric cylinder of this invention continuously extends, driving the middle plate to its upper position. The slide frame continues to slide outward within the slide hole, and the four rubber pads of each clamping assembly clamp the cable outward, straightening it. At this point, the circular slider begins to slide within the slide cavity, compressing the spring. When the middle plate reaches its upper position, the spring provides an elastic force, pressing the slide frame and end plates outward. Consequently, the rotating drum, rocker arm, and angle plate all tend to move outward. Friction between the rubber pads and the cable maintains its straightness, thereby reducing detection errors.

[0015] 3. When the semicircular clamp of the present invention rotates in the swivel seat, the dust shield arc plate is always in contact with the arc surface of the sealing frame. The dust shield arc plate prevents dust from entering the interior of the upper shell through the through hole, thereby avoiding a reduction in detection efficiency.

[0016] 4. The present invention pulls the rotating drum to separate the two slides on the rotating drum from the corresponding two slide grooves, compresses the rotating drum, and rotates the rotating drum 180 degrees, that is, the two slides on the rotating drum are respectively aligned with the two slide grooves on the opposite sides, and the rotating drum is released. The rotating drum provides elastic force to move the rotating drum in the direction of the guide rod, so the slides on the rotating drum are respectively inserted into the slide grooves on the opposite sides. Therefore, the rocker arm and the angle plate rotate 180 degrees synchronously with the rotating drum. When the detector is used again, the clamping assembly no longer takes effect, and rapid detection can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention as a whole.

[0018] Figure 2 This is a schematic diagram of the overall structure of the terminal unit in Example 1 of the present invention.

[0019] Figure 3 This is a schematic structural diagram of the cross section of the terminal unit in Example 1 of the present invention.

[0020] Figure 4 Schematic diagram of the internal structure of the terminal unit in Example 1 of the present invention.

[0021] Figure 5 It is a structural schematic diagram of the installation of the lower shell and the upper shell of the present invention.

[0022] Figure 6 This is a structural diagram of the guide rod installation in Example 1 of the present invention.

[0023] Figure 7 for Figure 6 A partial enlarged view of point A in the middle.

[0024] Figure 8 This is a schematic structural diagram of the explosion of the rotating drum and the guide rod in the first embodiment of the present invention.

[0025] Figure 9 It is a structural schematic diagram of the cross section of the corner plate of the present invention.

[0026] Figure 10 This is a schematic structural diagram of the installation of the semicircular pliers of the present invention.

[0027] Figure 11 This is a structural diagram of the torsion plate installation of the present invention.

[0028] Figure 12 This is a structural diagram of the installation of the dust shield arc plate and the sealing frame of the present invention.

[0029] Figure 13 This is a schematic diagram of the overall structure of the terminal unit in Example 2 of the present invention.

[0030] Figure 14 This is a schematic structural diagram of the explosion of the rotating drum and the guide rod in the second embodiment of the present invention.

[0031] Figure numbers: 1-Instrument; 2-Wire; 3-Lower shell; 4-Upper shell; 401-Slide hole; 402-Through hole; 5-Slide frame; 6-End plate; 601-Slide cavity; 7-Rotating cylinder; 8-Pole; 9-Guide rod; 901-Slide groove; 10-Fixed seat; 11-Slide table; 12-Circular slider; 13-Strut; 14-Square plate; 15-Spring 1; 16-Connecting plate; 17-Middle plate; 18-Electric cylinder; 19-Angle plate; 1901-Middle cavity; 20-Slide support plate; 21-Spring 2; 22-Clamping rod; 23-Rubber pad; 24-Swivel seat; 25-Semicircular clamp; 26-Torsion plate; 27-Arc guide rod; 28-Slide seat; 29-Spring 3; 30-L-shaped drive plate; 31-Dust shield arc plate; 32-Sealing frame; 33-Spring 4. DETAILED DESCRIPTION

[0032] In the present invention, unless otherwise specified, directions such as "up" and "down" are generally used with respect to the directions shown in the drawings, or with respect to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" are generally used with respect to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0033] Example 1: Please refer to Figure 1-12 Structural schematic diagram, the present invention provides the following technical solutions: A portable three-channel current detector includes a meter 1, three wires 2 are connected to the meter 1, the ends of the three wires 2 are connected to a terminal unit, the terminal unit includes a lower shell 3 connected to the wires 2, the upper part of the lower shell 3 is connected to the upper part through the upper shell 4, and the two short sides of the upper shell 4 are provided with sliding holes 401.

[0034] Specifically, the terminal unit is used to sheath the cable, and the user selects the number of terminal units to be used based on actual detection requirements.

[0035] The two sliding holes 401 of the upper shell 4 are each provided with a clamping assembly, and the clamping assembly includes a sliding frame 5 slidably arranged in the sliding hole 401, and the port of the sliding frame 5 is provided with an end plate 6, and two rotating drums 7 are rotatably provided on the end plate 6, and the outer end of the rotating drum 7 is provided with a rocker rod 8 for clamping the cable, and a guide rod 9 is inserted into the rotating drum 7, and the guide rod 9 is fixed on the fixed seat 10, and the fixed seat 10 is fixed on the inner side surface of the upper shell 4, and two sliding grooves 901 are symmetrically provided on the guide rod 9, and the sliding groove 901 consists of a straight line segment and an oblique line segment. The inner side surface of the rotating drum 7 is provided with two slides 11 that respectively form a sliding fit with the two sliding grooves 901.

[0036] A sliding cavity 601 is provided in the middle of the end plates 6 of the two clamping assemblies, and a circular slider 12 is slidingly provided in the sliding cavity 601. A support rod 13 is provided on the circular slider 12, and the support rod 13 extends to the outside of the end plate 6. A square plate 14 is provided on the support rod 13, and a spring 15 is sleeved on the outside of the support rod 13. The two sides of the spring 15 are respectively connected to the end plate 6 and the square plate 14. Connecting plates 16 are provided on the sides of the two support rods 13. The support rod 13 is rotatably connected to the upper end of the corresponding connecting plate 16, and the lower ends of the two connecting plates 16 are jointly rotatably connected to the middle plate 17. The middle plate 17 is connected to the telescopic shaft of the electric cylinder 18, and the electric cylinder 18 is fixed on the inner wall of the lower shell 3.

[0037] The ends of the rocker arm 8 are each provided with an angle plate 19, which is composed of two side plates perpendicular to each other. The openings of the two angle plates 19 of each clamping assembly are relatively arranged, and a middle cavity 1901 is provided in the two side plates of the angle plate 19. A sliding plate 20 is slidingly provided in the middle cavity 1901, and a spring 21 is provided in the middle cavity 1901. The two ends of the spring 21 are respectively connected to the inner side wall of the middle cavity 1901 and the sliding plate 20. A clamping rod 22 is provided in the middle of the sliding plate 20, and the clamping rod 22 extends to the outside of the angle plate 19. The adjacent clamping rods 22 of each clamping assembly are vertical.

[0038] The ends of the clamping rods 22 located outside the angle plates 19 are provided with rubber pads 23 for clamping the cables, and the rubber pads 23 prevent the cables from being damaged.

[0039] Specifically, when the telescopic shaft of electric cylinder 18 is in the extended position, middle plate 17 is in the lower position, the two slide frames 5 are close together, the circular slider 12 contacts the sidewall of the slide cavity 601, and spring 15 is at its original length. The slide 11 on the rotating drum 7 is located in the corresponding oblique segment of the slide groove 901. This means that the two rocker arms 8 of each clamping assembly are in the open and separated state, and the two angle plates 19 are also separated.

[0040] During testing, the cables are simultaneously placed between the two angle plates 19 of each clamping assembly. The electric cylinder 18 is activated, causing its telescopic shaft to extend, driving the middle plate 17 upward. Power is transmitted through the two connecting plates 16, causing the struts 13 and end plates 6 of the two clamping assemblies to move synchronously outward. This causes the slide frame 5 to slide outward within the slide hole 401, moving the rotating drum 7 synchronously with it. The slide 11 on the rotating drum 7 slides within the slide groove 901, sliding from the oblique segment to the straight segment of the slide groove 901. During this process, the two rotating drums 7 rotate simultaneously within the slide frame 5, and in opposite directions. This means that the two angle plates 19 of each clamping assembly rotate simultaneously toward the center. When the slide 11 moves to the straight section of the slide groove 901, the four rubber pads 23 of each clamping assembly contact the cable at the same time, that is, the four rubber pads 23 clamp the cable at the same time, the sliding support plate 20 slides in the middle cavity 1901, and the spring 21 is compressed, so the rubber pads 23 can clamp cables of different diameters.

[0041] The telescopic shaft of electric cylinder 18 continues to extend, driving middle plate 17 to its upper position. During this process, slide 11 slides within the corresponding straight segment of slot 901, and slide frame 5 continues to slide outward within slide hole 401. The four rubber pads 23 of each clamping assembly clamp the cable and move it outward. When the cable is straightened, the four rubber pads 23 of each clamping assembly cease to move, meaning that neither rocker arm 8 nor rotating drum 7 moves, nor do the corresponding end plate 6 and slide frame 5. At this point, circular slider 12 begins to slide within slide cavity 601, compressing spring 15. When middle plate 17 reaches its upper position, spring 15 provides elastic force, pressing slide frame 5 and end plate 6 outward. Consequently, rotating drum 7, rocker arm 8, and angle plate 19 all tend to move outward. Friction between the rubber pads 23 and the cable keeps the cable straight.

[0042] Through holes 402 are provided on the two long side surfaces of the upper shell 4, and a swivel seat 24 is provided inside the upper shell 4 and at the through holes 402. A semicircular clamp 25 is rotatably provided on the swivel seat 24, and the semicircular clamp 25 extends to the outside of the upper shell 4 through the through holes 402. The ends of the two semicircular clamps 25 contact each other, and a torsion plate 26 is provided at both ends of the rotating shaft of the semicircular clamp 25. An arc-shaped guide rod 27 is fixed on the torsion plate 26, and the arc-shaped guide rod 27 is slidably provided on a slide 28. The slide 28 is fixed on the side wall of the swivel seat 24, and a spring three 29 is provided on the outer sleeve of the arc-shaped guide rod 27. The two ends of the spring three 29 are respectively connected to the torsion plate 26 and the slide 28.

[0043] An L-shaped driving plate 30 is provided on the middle plate 17 for driving the torsion plate 26 to rotate.

[0044] Specifically, when the rotating drum 7 is in the lower position, the torsion plate 26 is not in contact with the L-shaped drive plate 30. Spring 3 29 provides elastic force, which is transmitted through the torsion plate 26, causing the two semicircular clamps 25 to open. When the rotating drum 7 moves to the upper position, the L-shaped drive plate 30 contacts the torsion plate 26, driving the torsion plate 26 upward. The arc-shaped guide rod 27 slides within the slide 28, and spring 3 29 compresses. The torsion plate 26 rotates synchronously with the corresponding semicircular clamp 25, causing the ends of the two semicircular clamps 25 to contact each other. With the cable positioned between the two semicircular clamps 25, the instrument 1 is activated to detect the current in the cable.

[0045] Considering the need to prevent dust from entering the interior of the upper shell 4 through the through hole 402, a dust shield arc plate 31 is provided on the semicircular pliers 25, and the axis of the dust shield arc plate 31 coincides with the axis of the rotating shaft of the semicircular pliers 25. A sealing frame 32 is provided at the through hole 402 of the upper shell 4, and the semicircular pliers 25 passes through the sealing frame 32. The sealing frame 32 has an arc surface that contacts the dust shield arc plate 31.

[0046] Specifically, when the semicircular clamp 25 rotates in the rotating seat 24, the dust shield arc plate 31 is always in contact with the arc surface of the sealing frame 32. The dust shield arc plate 31 prevents dust from entering the interior of the upper shell 4 through the through hole 402, thereby avoiding a reduction in detection efficiency.

[0047] The working principle of a portable three-channel current detector provided by the present invention is as follows: the user selects the number of terminal units to be used according to the actual detection needs. When performing the detection, first, the telescopic shaft of the electric cylinder 18 is in the telescopic state. At this time, the middle plate 17 is in the lower position, the two sliding frames 5 are close to each other, the circular slider 12 is in contact with the side wall of the sliding cavity 601, and the spring 15 is in the original length. The slide 11 on the rotating drum 7 is located in the oblique segment of the corresponding slide groove 901, that is, the two rocker arms 8 of each clamping assembly are in an open and separated state, and the two angle plates 19 are also in a separated state. At the same time, the torsion plate 26 is not in contact with the L-shaped drive plate 30, and the spring 3 29 provides elastic force, which transmits force through the torsion plate 26, so that the two semicircular clamps 25 are in an open state.

[0048] During testing, the cable is simultaneously placed between the two angle plates 19 of each clamping assembly and between the two semicircular clamps 25. The electric cylinder 18 is activated, extending its telescopic shaft, driving the middle plate 17 upward. Power is transmitted through the two connecting plates 16, causing the struts 13 and end plates 6 of the two clamping assemblies to move synchronously outward. This means that the slide frame 5 slides outward within the slide hole 401, moving the rotating drum 7 synchronously with it. The slide 11 on the rotating drum 7 slides within the slide groove 901, sliding from the diagonal segment of the slide groove 901 to the straight segment. During this process, the two rotating drums 7 rotate simultaneously within the slide frame 5, and in opposite directions. This means that the two angle plates 19 of each clamping assembly rotate simultaneously toward the center. When slide 11 moves to the straight section of slot 901, the four rubber pads 23 of each clamping assembly simultaneously contact the cable, effectively clamping it. This positions the cable at the center of the two semicircular jaws 25, thus reducing detection errors. As support plate 20 slides within central cavity 1901, spring 21 compresses, allowing rubber pads 23 to clamp cables of varying diameters.

[0049] The telescopic shaft of electric cylinder 18 continues to extend, driving middle plate 17 to its upper position. During this process, slide 11 slides within the corresponding straight segment of slot 901, and slide frame 5 continues to slide outward within slide hole 401. The four rubber pads 23 of each clamping assembly clamp the cable and move it outward. When the cable is straightened, the four rubber pads 23 of each clamping assembly cease to move, meaning that neither rocker arm 8 nor rotating drum 7 moves, nor do the corresponding end plate 6 and slide frame 5. At this point, circular slider 12 begins to slide within slide cavity 601, compressing spring 15. When middle plate 17 reaches its upper position, spring 15 provides elastic force, pressing slide frame 5 and end plate 6 outward. Consequently, rotating drum 7, rocker arm 8, and angle plate 19 all tend to move outward. Friction between the rubber pads 23 and the cable keeps the cable straight. At this point, L-shaped drive plate 30 contacts torsion plate 26, driving it upward. Arc-shaped guide rod 27 slides within slide 28, compressing spring 3 29. Torsion plate 26 rotates synchronously with its corresponding semicircular clamp 25, bringing the ends of the two semicircular clamps 25 into contact. When meter 1 is activated, an electrical signal is transmitted through wire 2. The two semicircular clamps 25 form an induction coil, detecting the current in the cable.

[0050] Example 2: Please refer to Figure 13-14 Structural diagram. Based on the first embodiment, this embodiment differs in that the end plate 6 and the rotating drum 7 form a rotating and sliding engagement. A spring 4 33 is sheathed around the exterior of the rotating drum 7, with both ends of the spring 4 33 contacting the rotating drum 7 and the end plate 6, respectively. The end of the chute 901 is chamfered to facilitate insertion of the slide 11.

[0051] During normal use, spring 4 33 provides elastic force to prevent the rotating drum 7 from sliding on the end plate 6, even if the rotating drum 7 only rotates in the end plate 6, so the present invention can be used normally. When rapid detection is required and high-precision detection is not required, that is, when it is not necessary to ensure that the cable is located in the center of the two semicircular clamps 25, the rotating drum 7 is pulled to separate the two slides 11 on the rotating drum 7 from the corresponding two slide grooves 901. The spring 4 33 is compressed, causing the rotating drum 7 to rotate 180 degrees, that is, the two slides 11 on the rotating drum 7 are aligned with the two slide grooves 901 on the opposite side. The rotating drum 7 is released, and the rotating drum 7 provides elastic force to move the rotating drum 7 in the direction of the guide rod 9. Therefore, the slides 11 on the rotating drum 7 are respectively inserted into the slide grooves 901 on the opposite side. Therefore, the rocker arm 8 and the angle plate 19 rotate 180 degrees synchronously with the rotating drum 7. When the present detector is used again, the clamping assembly no longer functions, and rapid detection can be performed.

[0052] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all included in the scope of protection of the present invention.

Claims

1. A portable three-channel current detector, comprising a meter (1), three wires (2) connected to the meter (1), characterized in that: The ends of the three wires (2) are all connected to a terminal unit, which includes a lower shell (3) connected to the wires (2), an upper shell (4) connected to the upper portion of the lower shell (3), and two short side surfaces of the upper shell (4) are provided with sliding holes (401); the two sliding holes (401) of the upper shell (4) are both provided with a clamping assembly, the clamping assembly includes a sliding frame (5) slidingly arranged in the sliding hole (401), an end plate (6) is provided at the end of the sliding frame (5), two rotating drums (7) are rotatably provided on the end plate (6), a rocker (8) for clamping the cable is provided at the outer end of the rotating drum (7), a guide rod (9) is inserted into the rotating drum (7), the guide rod (9) is fixed on the fixed seat (10), and the fixed seat (10) is fixed on the inner side surface of the upper shell (4), two sliding grooves (901) are symmetrically provided on the guide rod (9), and the sliding groove (901) is composed of a straight line segment and an oblique line segment. The rotating drum (7) The inner side surface is provided with two slides (11) which respectively form a sliding fit with the two slide grooves (901); the middle part of the end plates (6) of the two clamping assemblies is provided with a sliding cavity (601), and a circular slider (12) is slidably provided in the sliding cavity (601), and a support rod (13) is provided on the circular slider (12), and the support rod (13) extends to the outside of the end plate (6), and a square plate (14) is provided on the support rod (13), and a spring (15) is provided on the outside of the support rod (13), and the two sides of the spring (15) are respectively connected to the end plate (6) and the square plate (14), and the sides of the two support rods (13) are provided with connecting plates (16), and the support rod (13) is rotatably connected to the upper end of the corresponding connecting plate (16), and the lower ends of the two connecting plates (16) are rotatably connected to a middle plate (17), and the middle plate (17) is connected to the telescopic shaft of the electric cylinder (18), and the electric cylinder (18) is fixed on the inner side wall of the lower shell (3).

2. The portable three-channel current detector according to claim 1, characterized in that: The ends of the rocker arm (8) are provided with angle plates (19), which are composed of two mutually perpendicular side plates. A central cavity (1901) is provided in the two side plates of the angle plate (19), a sliding support plate (20) is provided in the central cavity (1901), and a spring 2 (21) is provided in the central cavity (1901). The two ends of the spring 2 (21) are respectively connected to the inner side wall of the central cavity (1901) and the sliding support plate (20). A clamping rod (22) is provided in the middle of the sliding support plate (20), and the clamping rod (22) extends to the outside of the angle plate (19).

3. The portable three-channel current detector according to claim 2, characterized in that: The ends of the clamping rods (22) located outside the angle plates (19) are each provided with a rubber pad (23) for clamping the cable.

4. The portable three-channel current detector according to claim 3, characterized in that: The upper shell (4) is provided with a through hole (402) on both long sides, and a swivel seat (24) is provided inside the upper shell (4) and at the through hole (402). The swivel seat (24) is provided with a semicircular clamp (25) for rotation, and the semicircular clamp (25) extends to the outside of the upper shell (4) through the through hole (402). The ends of the two semicircular clamps (25) contact each other. A torsion plate (26) is provided at both ends of the rotating shaft of the semicircular clamp (25). An arc guide rod (27) is fixed on the torsion plate (26). The arc guide rod (27) is slidably provided on a slide seat (28). The slide seat (28) is fixed on the side wall of the swivel seat (24). The outer sleeve of the arc guide rod (27) is provided with a spring three (29), and the two ends of the spring three (29) are respectively connected to the torsion plate (26) and the slide seat (28).

5. The portable three-channel current detector according to claim 4, characterized in that: An L-shaped drive plate (30) for driving the torsion plate (26) to rotate is provided on the middle plate (17).

6. The portable three-channel current detector according to claim 5, characterized in that: The semicircular pliers (25) are provided with a dust shield arc plate (31), the axis of the dust shield arc plate (31) coincides with the axis of the rotating shaft of the semicircular pliers (25), a sealing frame (32) is provided at the through hole (402) of the upper shell (4), the semicircular pliers (25) passes through the sealing frame (32), and the sealing frame (32) is provided with an arc surface that contacts the dust shield arc plate (31).

7. The portable three-channel current detector according to claim 6, characterized in that: A rotational and sliding cooperation relationship is formed between the end plate (6) and the rotating drum (7). A spring four (33) is sleeved on the outside of the rotating drum (7), and two ends of the spring four (33) are in contact with the rotating drum (7) and the end plate (6) respectively.

8. The portable three-channel current detector according to claim 7, characterized in that: The end of the slide groove (901) is provided with a chamfer to facilitate the insertion of the slide (11).

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