Portable CT polarity testing device

Abstract

The invention relates to the technical field of current polarity detection, in particular to a portable CT polarity testing device which comprises a tester, a wire, a handheld rod and a clamping mechanism. The wire is used for connecting the tester and the clamping mechanism; the clamping mechanism is arranged on the handheld rod, is used for clamping an external equipment terminal, and comprises a fixing part, a turntable, a clamping rod and a pull rope; the fixed part is fixed on the handheld rod; the two rotary tables are coaxial, are rotationally mounted on the fixing part around the axis perpendicular to the handheld rod and rotate in the opposite directions all the time; the four clamping rods are arranged in the circumferential direction of the rotating disc to define the four clamping sections, in the using process, the proper clamping sections can be selected according to the position of an equipment terminal to clamp the equipment terminal, the pull rope is used for driving the rotating disc to rotate to drive the clamping rods to swing for clamping, and the device can adapt to the environment where lines are complex and manual direct operation is difficult to conduct; and the clamping convenience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of current polarity detection, and particularly relates to a portable CT polarity testing device. BACKGROUND

[0002] The portable CT polarity testing device is mainly used for checking the polarity of a current transformer (CT) to ensure that the wiring direction is correct, which is crucial for the safe operation of the power system and the normal work of the equipment, especially when performing relay protection and metering, the correct polarity ensures the accuracy of the signal. When in use, the test end of the testing device needs to be connected to the output end of the secondary side of the CT to be tested, and a suitable test mode needs to be selected, and the testing device will excite the CT through analog current or other ways to obtain the wiring direction of the CT.

[0003] In the prior art, the patent for invention with the publication number CN111123171B discloses a telescopic mutual inductance current polarity testing device, which drives the gripper device to realize the conductive connection through the telescopic handle, and the gripper is arranged as a circular ring structure connected by a torsion spring, which facilitates the connection and disconnection of the mutual inductor conductor, but the circular ring structure is easy to fail to clamp when clamping the terminal to be tested if the line at the terminal position is complex or blocked, which affects the detection efficiency. SUMMARY

[0004] The present application provides a portable CT polarity testing device to solve the problem of poor maneuverability of the clamping structure of the existing testing device.

[0005] The portable CT polarity testing device of the present application adopts the following technical scheme: A portable CT polarity testing device, comprising a tester, a wire, a hand-held rod and a clamping mechanism; the wire has at least two, and one end of each wire is connected to an output end on the tester; the hand-held rod and the clamping mechanism are one-to-one corresponding to the wire, and the clamping mechanism is arranged on the hand-held rod; the clamping mechanism is used for clamping an externally connected device terminal and comprises a fixed part, a rotating disc, a clamping rod and a pull rope; the fixed part is fixed to the hand-held rod; the rotating disc has two coaxial rotating discs, which are installed on the fixed part around the axis perpendicular to the hand-held rod and always rotate in opposite directions; the clamping rod has four, which are arranged in a circle around the rotating disc, and the opposite two clamping rods are slidably installed on the same rotating disc; the rotating disc drives its corresponding two clamping rods to oscillate around the rotating disc through an elastic element, and when one of the clamping rods abuts against the device terminal, it can continue to rotate to drive the other clamping rod to oscillate; each clamping rod is electrically connected to the wire on both sides in the circumferential direction of the rotating disc; one end of each of the two pull ropes is connected to one of the rotating discs and is located on both sides of the rotating disc, and is used for rotating the rotating disc in opposite directions, so that the four clamping rods are close to each other, and the pull rope is fixed to the hand-held rod after the two clamping rods clamp the device terminal.

[0006] Optionally, two arc grooves are formed on the rotating disc and extend along the circumferential direction of the rotating disc, and the arc grooves are coaxial with the rotating axis of the rotating disc; the clamping rods are arranged along the radial direction of the rotating disc, one end of each clamping rod is slidably connected with one arc groove through a sliding piece, and the sliding piece and the arc groove are connected at two ends in the circumferential direction of the arc groove through an elastic piece; the clamping rod and the fixed part are slidably connected along an arc-shaped track coaxial with the rotating axis of the rotating disc, and the fixed part limits the rotation of the clamping rod around the sliding piece and allows the clamping rod to swing around the rotating axis of the rotating disc.

[0007] Optionally, the two sides of the clamping rod in the circumferential direction of the rotating disc are clamping surfaces; the clamping rod is hollow, and the clamping surfaces are provided with air blowing holes communicating with the interior of the clamping rod; an air bag is arranged between adjacent two clamping rods, and each air bag communicates with the interiors of adjacent two clamping rods or two clamping rods not adjacent to each other, so that the air bag is squeezed to blow air to clean the equipment terminal when the clamping rods are close to each other.

[0008] Optionally, a plurality of grid bars are arranged at the end of the clamping rod away from the rotating disc, the grid bars are perpendicular to the rotating axis of the rotating disc, and are arranged in the direction of the rotating axis of the rotating disc in sequence and at intervals, and the grid bars of adjacent two clamping rods are staggered in the direction of the rotating axis of the rotating disc.

[0009] Optionally, the two rotating discs are driven by a gear mechanism, and the gear mechanism drives the two rotating discs to rotate in opposite directions.

[0010] Optionally, a plurality of buckles are arranged on the hand-held rod and are arranged at intervals in the axial direction of the hand-held rod, and the end of the pull rope is connected with a clamping column, so that the pull rope is clamped with the buckle through the clamping column after driving the rotating disc to rotate, and the rotating disc is prevented from returning to the original position, so that the clamping rod remains in the clamping state.

[0011] The portable CT polarity testing device has the advantages that four clamping rods are arranged in the circumferential direction of the rotating disc to define four clamping intervals, in use, the appropriate clamping interval can be selected according to the position of the equipment terminal to clamp the equipment terminal, and the rotating disc is driven to rotate by the pull rope to drive the clamping rod to swing for clamping, which can adapt to the environment with complex lines and direct operation by human beings, and the convenience of clamping is improved.

[0012] Further, the four clamping rods are independent of each other, when two clamping rods abut against the equipment terminal, the rotating disc can further drive the other two clamping rods to continue to swing until they are folded, the occupying space of the clamping rods in the non-working state is reduced, and the influence of the clamping rods on the detection process is further reduced.

[0013] Further, an air bag is arranged between adjacent two clamping rods, and each air bag communicates with the interiors of adjacent two clamping rods or two clamping rods not adjacent to each other, so that the air bag is squeezed to blow air to clean the equipment terminal when the clamping rods are close to each other, the contact position is ensured to be clean, and the influence of foreign matters on the clamping effect and the conductive effect is avoided.

[0014] Embodiments of the present application will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present application.

[0016] Figure 2 is a schematic diagram of the structure of the hand-held rod and the clamping mechanism of the present application.

[0017] Figure 3 is a schematic diagram of the clamping mechanism of the present application.

[0018] Figure 4 is a schematic diagram of the clamping mechanism of the present application. Figure 2 is an enlarged schematic diagram of position A in FIG. 4.

[0019] Figure 5 is a schematic diagram of the communication between the air bag and the clamping rod of the present application.

[0020] Figure 6 is a schematic diagram of the clamping mechanism of the present application.

[0021] In the drawings: 100, tester; 200, wire; 300, hand-held rod; 310, buckle; 400, clamping mechanism; 410, fixed part; 411, ring groove; 420, upper turntable; 421, arc groove; 422, gear shaft; 430, lower turntable; 440, clamping rod; 441, air blowing hole; 442, grid bar; 443, sliding column; 450, pull rope; 451, clamping column; 461, central gear; 462, double gear; 463, gear ring; 470, sliding member; 480, air bag; 481, hose. DETAILED DESCRIPTION

[0022] An embodiment of a portable CT polarity testing device of the present application, as shown in FIG. 1, includes a tester 100, wires 200, a hand-held rod 300, and a clamping mechanism 400. Figures 1 to 6

[0023] The wires 200 are at least two in number, and each wire 200 is connected to an output end on the tester 100.

[0024] The hand-held rod 300 and the clamping mechanism 400 each correspond to a wire 200, and the clamping mechanism 400 is arranged on the hand-held rod 300.

[0025] ​The clamping mechanism 400 is used for clamping the external device terminal, comprising a fixed part 410, a rotating disc, a clamping rod 440 and a pull rope 450; the fixed part 410 is fixed to the handheld rod 300. The rotating disc has two coaxial rotating discs, which are installed on the fixed part 410 and rotate in opposite directions at all times. The clamping rod 440 has four clamping rods, which are arranged in a circumferential direction of the rotating disc. Opposite two clamping rods 440 are slidably installed on the same rotating disc. The rotating disc drives the corresponding two clamping rods 440 to oscillate around the rotating axis of the rotating disc through a resilient member. When one of the clamping rods 440 abuts against the device terminal, the rotating disc can continue to rotate to drive the other clamping rod 440 to oscillate. Each clamping rod 440 is electrically connected to the wire 200 on both sides in the circumferential direction of the rotating disc. Specifically, the wire 200 can be electrically connected to the clamping rod 440 through the fixed part 410, or the wire 200 can pass through the fixed part 410 and be electrically connected to the four clamping rods 440. One end of each of the two pull ropes 450 is connected to one of the rotating discs and is located on both sides of the rotating disc. The two pull ropes 450 are used to pull the rotating discs to rotate in opposite directions, so that the four clamping rods 440 are close to each other. After the two clamping rods 440 clamp the device terminal, the pull ropes 450 are fixed to the handheld rod 300.

[0026] In use, an operator holds the handheld rod 300. The wire 200 can pass through the inside of the handheld rod 300 and be electrically connected to the clamping rod 440. According to the position of the device terminal, two appropriate clamping rods 440 are selected. One of the pull ropes 450 is pulled to drive the rotating disc to rotate. The two rotating discs rotate in opposite directions to drive the two clamping rods 440 on both sides of the device terminal to move close to each other. At the same time, the other two clamping rods 440 also move close to each other. When the two clamping rods 440 on both sides of the device terminal abut against the device terminal, the rotating disc continues to rotate to increase the clamping force between the clamping rod 440 and the device terminal, and drive the other two clamping rods 440 to further move close to each other to reduce the influence on the device to be tested. After clamping, the other end of the pull rope 450 is fixed to the handheld rod 300. When one of the pull ropes 450 is pulled to drive the rotating disc to rotate, the other pull rope 450 is in a relaxed state.

[0027] By arranging four clamping rods 440 in the circumferential direction of the rotating disc, four clamping intervals are defined. In use, the appropriate clamping interval can be selected according to the position of the device terminal to clamp it. The rotating disc is driven to rotate by the pull rope 450 to drive the clamping rod 440 to oscillate for clamping. This can adapt to complex lines and human direct operation environment, and increase the convenience of clamping.

[0028] Further, the four clamping rods 440 are independent of each other. When the two clamping rods 440 abut against the device terminal, the rotating disc can still drive the other two clamping rods 440 to continue to oscillate until they are closed. This reduces the occupied space of the clamping rod 440 in a non-working state, and further reduces the influence on the detection process.

[0029] In the embodiment, the handheld rod 300 is a hollow telescopic rod structure composed of a plurality of threaded pipes connected in sequence. The overall length of the handheld rod 300 can be adjusted by rotating the threaded pipes to meet the use requirements of different lengths.

[0030] In the embodiment, two arc grooves 421 extending along the circumferential direction of the rotating disc are formed on the rotating disc, and the arc grooves 421 are coaxial with the rotation axis of the rotating disc. The clamping rods 440 are arranged along the radial direction of the rotating disc. One end of each clamping rod 440 is in sliding fit with one arc groove 421 through a sliding piece 470, and the sliding piece 470 and the arc groove 421 are connected at both ends in the circumferential direction thereof through an elastic piece. The elastic piece is a spring. When the rotating disc rotates, the sliding piece 470 is driven to rotate synchronously by extruding the elastic piece on one side, and in turn drives the clamping rod 440 to swing. After one of the clamping rods 440 abuts against the device terminal, the rotating disc continues to rotate to further compress the elastic piece on one side of the sliding piece 470 of the clamping rod 440, and in turn drives the other clamping rod 440 to continue to swing. The sliding piece 470 includes a sliding block slidingly arranged in the arc groove 421 and a clamping plate clamped to the clamping rod 440. The clamping plate and the sliding block are connected through a connecting rod. The clamping plate is in surface contact with the clamping rod 440, which can limit the rotation of the clamping rod 440 around the sliding block to a certain extent. The clamping rod 440 is in sliding fit with the fixed part 410 along an arc-shaped track coaxial with the rotation axis of the rotating disc. The fixed part 410 limits the rotation of the clamping rod 440 around the sliding piece 470 and allows the clamping rod 440 to swing around the rotation axis of the rotating disc. Specifically, at least two ring grooves 411 are formed on the fixed part 410. The at least two ring grooves 411 are coaxial with the rotation axis of the rotating disc and are distributed at intervals. At least two sliding columns 443 are arranged on each clamping rod 440. Each sliding column 443 is slidingly installed in one ring groove 411.

[0031] In the embodiment, the clamping face of the clamping rod 440 is formed on both sides of the clamping rod 440 in the circumferential direction of the rotating disc. The clamping rod 440 is hollow. The clamping face is provided with a gas blowing hole 441 in communication with the inside of the clamping rod 440. An air bag 480 is arranged between adjacent two clamping rods 440. Each air bag 480 is in communication with the inside of the adjacent or non-adjacent two clamping rods 440 through two hoses 481, so as to blow gas to clean the device terminal when the clamping rods 440 are close to each other, to ensure the cleanliness of the contact position and avoid the influence of foreign matters on the clamping effect and the conductive effect. A one-way valve is arranged on the air bag 480 to communicate with the outside. The one-way valve allows gas to enter the air bag 480, so as to allow the air bag 480 to expand and recover when the two clamping rods 440 are away from each other.

[0032] In the embodiment, the end of the clamping rod 440 away from the rotating disc is provided with a plurality of grid bars 442, which are perpendicular to the rotating axis of the rotating disc and are sequentially and spacedly arranged along the rotating axis of the rotating disc, and the grid bars 442 of the adjacent two clamping rods 440 are staggered in the direction of the rotating axis of the rotating disc. Preferably, the grid bars 442 are arc-shaped bars with concave surfaces facing the center of the rotating disc, and when the two clamping rods 440 are close to each other to clamp the terminals of the device, the grid bars 442 at the ends of the two clamping rods 440 are staggered, thereby preventing the terminals of the device from being separated from the ends of the two clamping rods 440 away from the rotating disc.

[0033] In the embodiment, the two rotating discs are driven by a gear mechanism, and the gear mechanism drives the two rotating discs to rotate in opposite directions. Specifically, the gear mechanism includes a center gear 461, a double gear 462 and a gear ring 463. The center gear 461 is rotationally installed on the fixed part 410 and coaxial with the rotating axis of the rotating disc. The two rotating discs are the upper rotating disc 420 and the lower rotating disc 430. The side of the upper rotating disc 420 close to the lower rotating disc 430 is coaxially fixed with a gear shaft 422, the gear shaft 422 penetrates through the fixed part 410 and is connected with the center gear 461 to drive the center gear 461 to rotate synchronously. The gear ring 463 is arranged on the lower rotating disc 430 and coaxial with the rotating axis of the lower rotating disc 430. The double gear 462 is rotationally installed on the fixed part 410 and includes two coaxial and fixedly connected large gears and small gears. The large gears and small gears are respectively engaged with the gear ring 463 and the center gear 461, and the gear ring 463 and the center gear 461 have the same rotating speed and opposite rotating directions.

[0034] In the embodiment, a plurality of buckles 310 are arranged on the handheld rod 300 and spaced along the axial direction of the handheld rod 300. The end of the pull rope 450 is connected with a clamping column 451. After the pull rope 450 drives the rotating disc to rotate, the pull rope 450 is clamped with the buckle 310 through the clamping column 451, thereby preventing the rotating disc from being reset and making the clamping rod 440 keep the clamping state. The pull rope 450 is connected to the two sides of the upper rotating disc 420 on the same reference diameter, and the reference diameter is perpendicular to the handheld rod 300, so that the upper rotating disc 420 is more easily driven to rotate when the pull rope 450 is pulled.

[0035] In the embodiment, the size of the clamping rod 440 in the circumferential direction of the rotating disc gradually increases from the end close to the rotating disc to the end away from the rotating disc.

[0036] The portable CT polarity testing device of the present application can be used in the following manner: first, the clamping rods 440 are used to clamp the device terminals by means of the hand-held rod 300, and then the wires 200 are connected to the tester 100. Specifically, the operator holds the hand-held rod 300, selects two appropriate clamping rods 440 according to the positions of the device terminals, pulls one of the pull ropes 450 to drive the upper turntable 420 to rotate, the upper turntable 420 drives the lower turntable 430 to rotate at the same speed in the opposite direction through the gear mechanism, and then drives the two clamping rods 440 located on both sides of the device terminals to move closer to each other, at the same time, the other two clamping rods 440 also move closer to each other, until the two clamping rods 440 on both sides of the device terminals abut against the device terminals, and then the pull rope 450 is continuously pulled to drive the upper turntable 420 to rotate to increase the clamping force between the two clamping rods 440 and the device terminals, and to further drive the other two clamping rods 440 to move closer to each other to reduce the influence on the device to be tested. After clamping, the other end of the pull rope 450 is clamped to the buckle 310 at the corresponding position of the hand-held rod 300. After the two corresponding clamping mechanisms 400 of the wires 200 clamp the corresponding device terminals, the other ends of the wires 200 are connected to the tester 100, and the tester 100 is operated to detect the polarity of the device terminals.

[0037] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A portable CT polarity test device, characterized by: It comprises a tester (100), a wire (200), a handheld rod (300) and a clamping mechanism (400); There are at least two wires (200), and one end of each wire (200) is connected to an output terminal on the tester (100); The handheld rod (300) and the clamping mechanism (400) both correspond to the wires (200) one by one, and the clamping mechanism (400) is arranged on the handheld rod (300); The clamping mechanism (400) is used to clamp the external device terminal, and includes a fixing portion (410), a rotating disk, a clamping rod (440) and a pull rope (450); the fixing portion (410) is fixed to the hand-held rod (300); there are two rotating disks, which are coaxial and rotate around an axis perpendicular to the hand-held rod (300) and are mounted on the fixing portion (410), and always rotate in opposite directions; there are four clamping rods (440), which are arranged at intervals around the circumference of the rotating disk, and one end of two opposing clamping rods (440) is slidably mounted on the same rotating disk, and the rotating disk drives its corresponding two clamping rods (440) through an elastic member. It swings around the rotation axis of the turntable, and when one of the clamping rods (440) abuts against the device terminal, it can continue to rotate to drive the other clamping rod (440) to swing; each clamping rod (440) is electrically connected to the wire (200) on both sides of the turntable in the circumferential direction; one end of the two pull ropes (450) is connected to one of the turntables and is located on both sides of the turntable, and is used to pull the turntable to rotate in opposite directions, so that the four clamping rods (440) are close to each other in pairs, and the pull ropes (450) are fixed to the hand-held rod (300) after two of the clamping rods (440) clamp the device terminal.

2. A portable CT polarity test device according to claim 1, characterized in that: The turntable is provided with two arc grooves (421) extending along its circumference, and the arc grooves (421) are coaxial with the rotation axis of the turntable; the clamping rods (440) are arranged along the radial direction of the turntable, and one end of each clamping rod (440) is slidably engaged with an arc groove (421) through a sliding member (470), and the sliding member (470) and the arc groove (421) are respectively connected at both ends of the circumference thereof by an elastic member; the clamping rod (440) and the fixing portion (410) are slidably engaged along an arc track coaxial with the rotation axis of the turntable, and the fixing portion (410) limits the clamping rod (440) from rotating around the sliding member (470) and allows the clamping rod (440) to swing around the rotation axis of the turntable.

3. The portable CT polarity test device according to claim 1, characterized in that: The clamping rod (440) has clamping surfaces on both sides in the circumferential direction of the turntable; the clamping rod (440) is hollow inside, and a blowing hole (441) communicating with the inside of the clamping rod (440) is provided on the clamping surface; an air bag (480) is provided between two adjacent clamping rods (440), and each air bag (480) is communicated with the inside of two adjacent or non-adjacent clamping rods (440), so that when the clamping rods (440) are close to each other, the air bag (480) is squeezed to blow air to clean the terminal of the device.

4. The portable CT polarity test device according to claim 1, characterized in that: A grid bar (442) is provided at one end of the clamping rod (440) away from the turntable. There are a plurality of grid bars (442), all of which are perpendicular to the rotation axis of the turntable and are arranged in sequence at intervals along the direction of the rotation axis of the turntable. The grid bars (442) of two adjacent clamping rods (440) are staggered in the direction of the rotation axis of the turntable.

5. The portable CT polarity test device according to claim 1, characterized in that: The two turntables are driven by a gear mechanism, which causes the two turntables to rotate in opposite directions.

6. The portable CT polarity test device according to claim 1, characterized in that: A plurality of buckles (310) are provided on the hand-held rod (300), and the plurality of buckles (310) are arranged at intervals along the axial direction of the hand-held rod (300). The end of the pull rope (450) is connected to a clamping column (451). After the pull rope (450) drives the turntable to rotate, it is clamped with the buckle (310) through the clamping column (451), thereby preventing the turntable from resetting and keeping the clamping rod (440) in a clamped state.

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