Auxiliary clamp for testing current transformer
By designing the current transformer test fixtures for auxiliary frames and fixture mechanisms, the problem of inconvenience in operation of existing fixtures is solved, and efficient and accurate current transformer testing is achieved to adapt to different models of current transformers.
Patent Information
- Application Number
- CN202421701349.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The existing current transformer fixtures are inconvenient to operate, especially through-type and casing type current transformers, which are difficult to achieve efficient and accurate testing, and the fixtures on the market are single and require multiple operations.
A current transformer testing auxiliary fixture including an auxiliary frame, a lift rack, a mounting plate and a transformer fixture mechanism is designed. The cylinder drive pull rod and fixture assembly are used, and the lift rack and pulley structure is combined to achieve stable clamping and testing of multiple sets of current transformers.
It improves the efficiency and accuracy of current transformer testing, can adapt to different models of current transformers, reduce manual operation steps, and reduce test errors.
Smart Images
Figure CN223244622U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current transformer test auxiliary fixtures, in particular to a current transformer test auxiliary fixture. Background Art
[0002] Current transformers are divided into through-type current transformers, pillar-type current transformers, bushing-type current transformers, and busbar current transformers; among them, the through-type current transformer is a current transformer used to pass through a screen or wall, and can be installed in a hole in a wall or metal structure. Its primary winding is a rod-shaped conductor passing through a porcelain sleeve; the pillar-type current transformer is a current transformer installed on a plane or a pillar, and also serves as a primary circuit conductor support; the bushing-type current transformer is directly mounted on the bushing of a 35kV and above power transformer or circuit breaker. It does not have a dedicated primary conductor, and the conductive core rod of the bushing is equivalent to the primary winding; the busbar current transformer does not have a dedicated primary winding. The busbar of the distribution device passing through the inside of the insulating sleeve acts as the primary winding, and the insulating porcelain sleeve insulates the primary winding from the secondary winding.
[0003] When the current transformer is used for testing, ordinary current transformers that can be squared on the test panel can be directly connected to the test instrument for testing. However, some current transformers, especially through-type current transformers and bushing-type current transformers, cannot be squared on a plane and the test is moving, which will cause test errors. If a fixture is required to clamp them and then test, the fixtures on the market are relatively simple and not convenient to operate, requiring workers to operate them multiple times. Now an auxiliary fixture is designed that can perform batch and multiple current transformer tests. Utility Model Content
[0004] In order to overcome the existing deficiencies, the utility model provides a current transformer test auxiliary fixture.
[0005] The technical solution adopted by the utility model to solve its technical problems is: a current transformer test auxiliary fixture, an auxiliary frame, a lifting frame, a mounting plate and a transformer fixture mechanism; a test instrument is placed on the auxiliary frame, a lifting frame is provided on the upper side, and a pulley is provided at the bottom; the lifting frame is slidably connected to the mounting plate, and the mounting plate is provided with a transformer fixture mechanism; the transformer fixture mechanism includes a cylinder, a pull rod and several groups of fixture assemblies; the cylinder is connected to the movable plate through an output rod, and the movable plate is provided with several groups of pull rods, with guide rods passing through both sides; each group of the pull rods corresponds to a group of fixture assemblies; the fixture assembly includes two groups of symmetrical clamping blocks, springs, pull blocks, and L-shaped plates; the L-shaped plate is slidably connected to the mounting plate, a pull block is provided on the upper side, and a lower side is fixed to the positioning block by a spring, and a clamping block is provided on one side; the other group of clamping blocks is relatively fixed to the mounting plate, and the mounting plate is provided with a threading hole in the middle of each two groups of symmetrical clamping blocks; the mounting plate 3 is provided with a clamp and a copper bar on the back.
[0006] According to another embodiment of the present invention, it further includes that a slide groove is provided on the mounting plate, a slider is slidably connected in the slide groove, the front end of the slider is fixed to the inside of the slide groove through a buffer spring, and the upper end is fixed to the bottom of the L-shaped plate.
[0007] According to another embodiment of the present invention, the L-shaped plate is provided with a stop block directly below the pull block.
[0008] According to another embodiment of the present invention, it further includes that the lifting frame includes a top plate, a stepper motor, a lifting screw, a screw nut and a lifting plate; the top plate is fixed to the auxiliary frame through a column, and a stepper motor is installed on the top plate, and a screw nut is vertically provided in the middle; the lifting screw is transmission-connected to the output shaft of the stepper motor, and is movably linked to the support plate of the top plate and the auxiliary frame through bearings and bearing seats, and a screw nut is provided in the middle; the screw nut is fixed with the lifting plate, and the left and right sides of the lifting plate back plate are slidably connected to the vertically installed linear slide rails, and the front plate is fixed with a mounting plate.
[0009] According to another embodiment of the present invention, the top of the lifting screw is provided with a rotating gear, which is connected to the gear connected to the output shaft of the stepping motor through a synchronous belt.
[0010] According to another embodiment of the present invention, it further includes that the clamping blocks are symmetrically arranged semi-arc structures, and are provided with insulating rubber pads with particles inside, which are respectively a left clamping block and a right clamping block, wherein slots are provided at both ends of the left clamping block, and jacks are provided on both sides of the right clamping block.
[0011] The beneficial effect of the utility model is that multiple groups of transformers can be conveniently placed and clamped by moving the lifting frame up and down, and the clamping blocks of different types of current transformers can be adjusted to make the up and down movement more stable, the test results more accurate, and the work efficiency improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0013] Figure 1 It is a structural diagram of the utility model;
[0014] Figure 2 It is a top view of the utility model;
[0015] Figure 3 It is a structural diagram of the lifting frame;
[0016] Figure 4 This is the back view of the mounting plate;
[0017] Figure 5 is a cross-sectional view of the fixture assembly holding the transformer;
[0018] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixture assembly.
[0019] In the figure, 1, auxiliary frame, 2, lifting frame, 3, mounting plate, 4, transformer clamp mechanism, 5, cylinder, 6, pull rod, 7, clamp assembly, 8, moving plate, 9, clamping block, 10, spring, 11, pull block, 12, L-shaped plate, 13, threading hole, 14, positioning block, 15, slide groove, 16, slider, 17, buffer spring, 18, stop block, 19, top plate, 20, stepping motor, 21, lifting screw, 22, screw nut, 23, lifting plate. DETAILED DESCRIPTION
[0020] like Figure 1 This is a structural diagram of the utility model, a current transformer test auxiliary fixture, characterized by an auxiliary frame 1, a lifting frame 2, a mounting plate 3 and a transformer fixture mechanism 4; the auxiliary frame 1 is placed with a test instrument, a lifting frame 2 is provided on the upper side, and a pulley is provided at the bottom; the lifting frame 2 is slidably connected to the mounting plate 3, and the mounting plate 3 is provided with a transformer fixture mechanism 4; the transformer fixture mechanism 4 includes a cylinder 5, a pull rod 6 and several groups of fixture assemblies 7; the cylinder 5 is connected to the movable plate 8 through an output rod, and the movable plate 8 is provided with several A dry group of pull rods 6, with guide rods passing through both sides; each group of the pull rods 6 corresponds to a group of clamp components 7; the clamp components 7 include two groups of symmetrical clamping blocks 9, springs 10, pull blocks 11, and L-shaped plates 12; the L-shaped plates 12 are slidably connected to the mounting plate 3, with a pull block 11 on the top, and one side of the bottom is fixed to the positioning block 14 by a spring 10, and a clamping block 9 on one side; the other group of clamping blocks 9 is relatively fixed to the mounting plate 3, and the mounting plate 3 is provided with a wire threading hole 13 in the middle of each two groups of symmetrical clamping blocks 9; the mounting plate 3 is provided with a clamp and a copper bar on the back.
[0021] According to another embodiment of the present invention, the mounting plate 3 is further provided with a slide groove 15, and a slider 16 is slidably connected in the slide groove 15. The front end of the slider 16 is fixed to the inside of the slide groove 15 by a buffer spring 17, and the upper end is fixed to the bottom of the L-shaped plate 12.
[0022] Specifically, the cylinder 55 drives the movable plate 8 to move forward and backward, wherein, when the movable plate 8 moves backward, the pull rod 6 on the movable plate drives the pull block 11 in the clamping block assembly 7 to move backward, so that the L-shaped plate 12 moves linearly in the slide groove 15 along with the slider 16. When it moves to the end of the slide groove 15, the clamping block 9 is symmetrically separated, which is convenient for taking the mutual inductor; when the movable plate 8 moves forward, the pull block 11 pushes the L-shaped plate 12 forward for clamping, and the mutual inductor can be clamped at this time.
[0023] According to another embodiment of the present invention, the L-shaped plate 12 is further provided with a stop block 18 directly below the pull block 11 .
[0024] Specifically, the buffer spring 17 and the spring 10 can slow down the forward and backward movement of the L-shaped plate 12, preventing the cylinder 5 from controlling the speed too fast and causing damage to the transformer housing, affecting product quality and sales, and ensuring quality while saving effort; the stop block 18 is used for limiting, which can prevent the cylinder 5 from extending and retracting beyond a limited range and damaging the device's buffer spring 17 and spring 10.
[0025] According to another embodiment of the present invention, it further includes that the lifting frame 2 includes a top plate 19, a stepper motor 20, a lifting screw 21, a screw nut 22 and a lifting plate 23; the top plate 19 is fixed to the auxiliary frame 1 through a column, and a stepper motor 20 is installed on the top plate 19, and a screw nut 22 is vertically provided in the middle; the lifting screw 21 is connected to the output shaft of the stepper motor 20 by transmission, and is movably linked to the top plate 19 and the support plate of the auxiliary frame 1 through bearings and bearing seats, and a screw nut 22 is provided in the middle; the screw nut 22 is fixed with the lifting plate 23, and the left and right sides of the back plate of the lifting plate 23 are slidably connected to the vertically installed linear slide rails, and the front plate is fixed with the mounting plate 3.
[0026] According to another embodiment of the present invention, further comprising: a rotating gear is provided on the top of the lifting screw rod 21, which is connected to the gear connected to the output shaft of the stepping motor 20 through a synchronous belt.
[0027] Specifically, the stepper motor 20 drives the lifting screw 21 to rotate, and the screw nut 22 moves up and down, driving the lifting plate 23 to move. The lifting plate 23 is assisted by two sets of linear slide rails to move up and down, ensuring that the mounting plate 3 does not tip over during the movement and does not affect the test.
[0028] According to another embodiment of the present invention, the clamping block 9 is a symmetrically arranged semi-arc structure, and an insulating rubber pad with particles is provided inside, which are respectively a left clamping block and a right clamping block, wherein slots are provided at both ends of the left clamping block, and jacks are provided on both sides of the right clamping block.
[0029] Specifically, the width of the clamping block 9 can be adjusted according to the size of the current transformer, and can be adjusted for current transformers of different sizes.
[0030] During the specific operation process, the lifting frame 2 on the auxiliary frame 1 descends, and the worker places the current transformers on one side of a group of clamps in the clamp assembly 7 in turn, adjusts the position, and after all are placed, the cylinder 5 drives another group of clamps 9 to clamp, and then starts the lifting frame 2 to rise. The lead wires below pass through the wire hole 13 to connect to the test instrument for testing. After the test is completed, the lifting frame 2 is adjusted to descend, all current transformers are removed, and the next set of operations is carried out.
[0031] The above description is only illustrative and not restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the appended claims, but all of them will fall within the scope of protection of the present invention.
Claims
1. A current transformer test auxiliary fixture, characterized in that: An auxiliary frame (1), a lifting frame (2), a mounting plate (3) and a mutual inductor fixture mechanism (4); a test instrument is placed on the auxiliary frame (1), a lifting frame (2) is provided on the upper side, and a pulley is provided on the bottom; the lifting frame (2) is slidably connected to the mounting plate (3), and the mounting plate (3) is provided with a mutual inductor fixture mechanism (4); the mutual inductor fixture mechanism (4) includes a cylinder (5), a pull rod (6) and several groups of fixture assemblies (7); the cylinder (5) is connected to a movable plate (8) through an output rod, and the movable plate (8) is provided with several groups of pull rods (6), and guide rods are passed through both sides; each group The pull rod (6) corresponds to a set of clamp components (7); the clamp components (7) include two sets of symmetrical clamp blocks (9), springs (10), pull blocks (11), and L-shaped plates (12); the L-shaped plates (12) are slidably connected to the mounting plate (3), with a pull block (11) provided on the top, and a clamp block (9) provided on one side of the bottom; the other set of clamp blocks (9) is relatively fixed to the mounting plate (3), and the mounting plate (3) is provided with a threading hole (13) in the middle of each two sets of symmetrical clamp blocks (9); the mounting plate (3) is provided with a clamp and a copper bar on the back.
2. The current transformer test auxiliary fixture according to claim 1, characterized in that: The mounting plate (3) is provided with a slide groove (15), and a slider (16) is slidably connected in the slide groove (15). The front end of the slider (16) is fixed to the inside of the slide groove (15) through a buffer spring (17), and the upper end is fixed to the bottom of the L-shaped plate (12).
3. The current transformer test auxiliary fixture according to claim 1, characterized in that: The L-shaped plate (12) is provided with a stop block (18) just below the pull block (11).
4. The current transformer test auxiliary fixture according to claim 1, characterized in that: The lifting frame (2) includes a top plate (19), a stepper motor (20), a lifting screw (21), a screw nut (22) and a lifting plate (23); the top plate (19) is fixed to the auxiliary frame (1) through a column, the stepper motor (20) is installed on the top plate (19), and a screw nut (22) is vertically provided in the middle; the lifting screw (21) is connected to the output shaft of the stepper motor (20) by transmission, and is movably linked to the top plate (19) and the support plate of the auxiliary frame (1) through a bearing and a bearing seat, and a screw nut (22) is provided in the middle; the screw nut (22) is fixed to the lifting plate (23), and the left and right sides of the back plate of the lifting plate (23) are slidably connected to the vertically installed linear slide rails, and the front plate is fixed to the mounting plate (3).
5. The current transformer test auxiliary fixture according to claim 4, characterized in that: The top of the lifting screw rod (21) is provided with a rotating gear, which is connected to the gear connected to the output shaft of the stepping motor (20) through a synchronous belt.
6. The current transformer test auxiliary fixture according to claim 1, characterized in that: The clamping blocks (9) are symmetrically arranged semi-arc structures, with insulating rubber pads with particles inside, which are respectively a left clamping block and a right clamping block, wherein slots are provided at both ends of the left clamping block, and jacks are provided at both sides of the right clamping block.