Metering high-voltage transformer testing fixture and clamping jaw

Abstract

The invention discloses a high-voltage mutual inductor testing fixture for metering and a clamping jaw, the high-voltage mutual inductor testing fixture for metering comprises a pre-tightening spring and two clamp bodies, each clamp body comprises a jaw part, a clamp handle part and a pivoting part located between the jaw part and the clamp handle part, the two pivoting parts are pivotally connected, and the clamping jaw is arranged between the jaw part and the clamp handle part. A plurality of elastic probes are respectively arranged on the opposite side surfaces of the two jaw parts; the two ends of the pre-tightening spring are connected with the two plier handle parts respectively. When the pre-tightening spring is in an initial state, the two jaw parts abut against each other under the action of the pre-tightening spring. According to the detection tool, the elastic probes are arranged on the opposite side surfaces of the jaw part, so that the screws on the mutual inductor are enveloped during clamping, the detection tool can adapt to the screws of different specifications, the types and the number of required plugging terminals can be greatly reduced, the detection operation procedure is simplified, the detection efficiency is improved, and the detection cost is reduced. And the problem of cable winding in a compact space is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage transformer detection tools, in particular to a transformer detection fixture and a clamping jaw for the transformer detection fixture. Background Art

[0002] The instrument transformer is an important instrument in the power system, which is mainly divided into current transformer and voltage transformer. The current transformer is an instrument that converts the large current on the primary side into the small current on the secondary side for measurement based on the principle of electromagnetic induction; the voltage transformer is mainly used to power measuring instruments and relay protection devices, and to measure the voltage, power and electric energy of the line. There are many varieties of instrument transformers and they are important instruments in the power system. They need to be tested and qualified before they can leave the factory. Since the primary and secondary ends of the transformer are mostly fixed by screws, the mainstream detection fixtures on the market currently mainly use a hollow plug-in terminal with a slot to plug and unplug screws for detection.

[0003] The existing single-type slotted plug-in terminal can only correspond to a single specification of screws. Due to the wide variety of transformers, the corresponding fixing screws have multiple specifications such as M6, M8, M10, M12, etc. When testing multiple transformers in a single detection cabin, it is necessary to switch the corresponding slotted plug-in terminals according to the specifications of the screws, which is cumbersome to operate; and the primary end (input positive pole, input negative pole) and secondary end (output positive pole, output negative pole, ground wire) of the transformer need to be wired. At least 5 wiring terminals are required for the detection of a single transformer. When facing transformers with different screw specifications, it is necessary to prepare multiple sets of plug-in terminals to realize wiring detection. When placing multiple sets of plug-in terminals, it is easy to cause problems such as cable entanglement. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing transformer inspection fixture cannot be used for fixing screws of different specifications on different types of transformers. The inspection fixture needs to be replaced during inspection, which is cumbersome to operate, and placing multiple sets of inspection fixtures together easily causes cable entanglement.

[0005] In order to solve the above technical problems, the present invention provides a mutual inductor testing fixture, comprising:

[0006] Two pliers, each of which comprises a jaw portion, a pliers handle portion and a pivoting portion between the jaw portion and the pliers handle portion, the two pivoting portions are pivotally connected, and a plurality of elastic probes are respectively disposed on opposite sides of the two jaw portions;

[0007] A preload spring, the two ends of which are respectively connected to the two clamp handles;

[0008] Wherein, when the preload spring is in an initial state, the two jaw portions abut against each other under the action of the preload spring.

[0009] In some embodiments, the mutual inductor testing fixture further includes a rotating shaft, and the two pivoting parts are pivotally connected via the rotating shaft.

[0010] In some embodiments, the pliers handle is provided with an insertion hole, and the insertion hole passes through two side surfaces of the pliers handle in a direction parallel to the axis of the rotating shaft.

[0011] In some embodiments, guide surfaces are respectively provided on both end edges of the clamp handle adjacent to the insertion hole.

[0012] In some embodiments, the jack is a square hole.

[0013] In some embodiments, two opposite hole walls of the square hole are parallel to an extension direction of the preload spring.

[0014] In some embodiments, the pliers body further includes a probe cover, which is detachably connected to the jaw portion, and the elastic probe is disposed on one side of the probe cover. The elastic probe includes a needle and a spring, one end of the spring is connected to the probe cover, and the other end of the spring is connected to the needle.

[0015] In some embodiments, the elastic probe is a copper elastic probe.

[0016] In some embodiments, the end of the elastic probe facing away from the jaw portion is hemispherical.

[0017] The present invention also provides a clamp for a transformer inspection fixture, comprising two plug posts and a driving mechanism for driving the two plug posts to move closer or further away, the plug posts being inserted one-to-one into the sockets on the transformer inspection fixture, the driving mechanism also being provided with a flange structure, the flange structure being used to connect to a six-axis robotic arm.

[0018] Compared with the prior art, the mutual inductor testing fixture of the embodiment of the present invention has the following beneficial effects:

[0019] By arranging an elastic probe on a side of each jaw part relative to the other jaw part, the two jaw handle parts are connected by a pre-tightening spring. When the pre-tightening spring is in the initial state, the two jaw handle parts abut against each other under the action of the pre-tightening spring. When an external force acts on the jaw handle parts, the two jaw parts can be opened away from each other, so that the fixing screw on the transformer can be located between the two jaw parts. Then, the external force is continued to be applied to the jaw handle parts to make the two jaw parts approach each other again, and the fixing screw is gradually enveloped between the elastic probes. After the force applied to the jaw handle parts is removed, the pre-tightening spring tends to restore its initial state by itself. Therefore, the transformer inspection fixture can continue to tightly wrap the fixing screw under the action of the pre-tightening spring, so as to facilitate the subsequent direct power-on of the transformer inspection fixture to detect the transformer. The transformer inspection fixture can adapt to screws of different specifications on different types of transformers, which can greatly reduce the types and quantities of required plug-in terminals, greatly simplify the detection operation procedure, improve the detection efficiency, and avoid the problem of cable entanglement in a compact space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a mutual inductor test fixture according to an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the cooperation between the transformer inspection fixture, the clamping jaws for the transformer inspection fixture and the mechanical arm according to an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 A schematic diagram of another direction of cooperation between the transformer inspection fixture and the clamping jaws and the mechanical arm for the transformer inspection fixture;

[0023] In the figure, 100, a transformer inspection fixture; 10, a clamp body; 11, a jaw portion; 12, a clamp handle portion; 121, a socket; 122, a guide surface; 123, an arc-shaped wall; 13, a pivot portion; 14, an elastic probe; 15, a probe cover; 20, a preload spring; 30, a rotating shaft; 200, a clamping jaw for a transformer inspection fixture; 201, a plug column; 202, a driving mechanism; 90, a robotic arm. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] In the present invention, unless otherwise clearly defined and specified, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1 As shown, a mutual inductor test fixture 100 according to a preferred embodiment of the present invention comprises:

[0027] Two pliers 10, each pliers 10 comprises a jaw portion 11, a pliers handle portion 12 and a pivoting portion 13 located between the jaw portion 11 and the pliers handle portion 12, the two pivoting portions 13 are pivotally connected, and a plurality of elastic probes 14 are respectively disposed on opposite sides of the two jaw portions 11;

[0028] A preload spring 20, two ends of which are respectively connected to the two clamp handles 12;

[0029] Among them, when the pre-tensioning spring 20 is in the initial state, the two jaw parts 11 abut against each other under the action of the pre-tensioning spring 20. Specifically, the two pliers bodies 10 can be arranged crosswise with each other or respectively on both sides of the pivot shaft 30. If the two pliers bodies 10 are arranged crosswise with each other, the initial state of the pre-tensioning spring 20 is a stretched state. If the two pliers bodies 10 are respectively arranged on both sides of the pivot shaft 30, the initial state of the pre-tensioning spring 20 is a compressed state.

[0030] Based on the transformer inspection fixture 100 of the above embodiment, an elastic probe 14 is arranged on a side of each jaw portion 11 relative to the other jaw portion 11, and the two jaw handles 12 are connected by a preload spring 20. When the preload spring 20 is in an initial state, the two jaw handles 12 abut against each other under the action of the preload spring 20. When an external force is applied to the jaw handle 12, the two jaw portions 11 can be opened away from each other, so that the fixing screw on the transformer can be located between the two jaw portions 11. Then, the external force is continuously applied to the jaw handle 12 to make the two jaw portions 11 approach each other again, and the fixing screw gradually moves away from each other. Being enclosed between the elastic probes 14, after the force applied to the clamp handle 12 is removed, the preload spring 20 tends to restore its initial state by itself. Therefore, the transformer inspection fixture 100 can continue to tightly enclose the fixing screw under the action of the preload spring 20, so that it is convenient to directly power on the transformer inspection fixture 100 to inspect the transformer in the future; the transformer inspection fixture 100 can adapt to screws of different specifications on different types of transformers, which can greatly reduce the types and quantities of required plug-in terminals, greatly simplify the inspection operation procedure, improve the inspection efficiency, and avoid the problem of cable entanglement in a compact space.

[0031] Specifically, the transformer test fixture 100 further includes a rotating shaft 30 , and the two pivoting parts 13 are pivotally connected via the rotating shaft 30 .

[0032] In some preferred embodiments, a socket 121 is provided on the clamp handle 12, and the socket 121 passes through the two side surfaces of the clamp handle 12 in a direction parallel to the axis of the rotating shaft 30. Therefore, the transformer inspection fixture 100 is convenient for a person to insert two fingers of one hand into the socket 121 respectively to apply force to the two clamp handles 12, and the socket 121 can also be connected to an automated instrument provided with a corresponding plug column 201 to automatically remove the transformer inspection fixture 100 from the fixing screws on the transformer without manual removal; the clamp handle 12 can also be designed to be handle-shaped, and the automated instrument can also design its connection structure with the clamp handle 12 accordingly.

[0033] Preferably, the two end edges of the clamp handle 12 adjacent to the socket 121 are respectively provided with guide surfaces 122 to facilitate the positioning of the automated instrument and to complete the matching with the socket 121, wherein the guide surfaces 122 are preferably arc surfaces.

[0034] Preferably, the jack 121 is a square hole, which is convenient for arranging a force sensor at the connection position of the automated instrument corresponding to the transformer gauge 100 to sense the force on the side wall at the connection position between the instrument and the transformer gauge 100 along the extension direction of the preload spring 20 .

[0035] Specifically, two opposite hole walls of the square hole are parallel to the extending direction of the preload spring 20 .

[0036] Preferably, two adjacent hole walls of the square hole are transitionally connected by an arc wall 123 to protect the plugging parts of the transformer gauge 100 and the automation instrument from wear when the transformer gauge 100 and the automation instrument are frequently plugged in.

[0037] In some preferred embodiments, the pliers body 10 also includes a probe cover 15, which is detachably connected to the jaw portion 11, and an elastic probe 14 is disposed on one side of the probe cover 15. The elastic probe 14 includes a needle and a spring, one end of the spring is connected to the probe cover 15, and the other end of the spring is connected to the needle. Thus, the transformer testing fixture 100 can conveniently replace the elastic probe 14 that gradually fails with its service life. In order to avoid entanglement between different springs and to avoid bending of the spring, a plurality of limit grooves are preferably provided on the probe cover 15, and the springs are correspondingly disposed in each limit groove.

[0038] Preferably, the elastic probe 14 is a copper elastic probe 14 , which has good electrical conductivity during subsequent power-on detection. The elastic probe 14 may also be made of other metal materials with good electrical conductivity.

[0039] In some preferred embodiments, the end of the elastic probe 14 facing away from the jaw portion 11 is hemispherical, so that the contact surface between the elastic probe 14 and the fixing screw is larger, which is convenient for power-on detection without damaging the fixing screw.

[0040] The present invention also provides a clamp 200 for a transformer gauge, comprising two plug posts 201 and a driving mechanism 202 for driving the two plug posts 201 to move closer or further away, the plug posts 201 are used to be inserted into the sockets 121 on the transformer gauge 100 in a one-to-one correspondence, and the driving mechanism 202 is also provided with a flange structure, which is used to connect with the six-axis robot 90, so that the clamp 200 for the transformer gauge can approach the transformer gauge 100 and insert the plug posts 201 into the sockets 121 of the transformer gauge 100 under the rotation and movement of each axis of the robot 90, and the driving mechanism 202 drives the plug posts 201 to move in a direction parallel to the extension direction of the preload spring 20, thereby realizing the opening or closing of the two jaws 11 of the transformer gauge 100 to fix the transformer. The screw is enveloping; the socket 121 on the transformer gauge 100 is preferably a square hole, and the plug column 201 is correspondingly set to a square column. A force sensor is preferably also provided on the side of the plug column 201 perpendicular to the driving direction of the driving mechanism 202 to detect the pressure of the transformer gauge 100 on the side of the plug column 201. When the force sensor detects that the pressure is not zero, the friction between the plug column 201 and the transformer gauge 100 prevents the transformer gauge 100 from falling from the plug column 201. When the transformer gauge 100 envelops the fixing screw on the transformer under the action of the plug column 201, when the force sensor detects that the pressure is zero, the robot arm 90 moves in a direction parallel to the penetration direction of the socket 121 and away from the transformer gauge 100, separates from the transformer gauge 100, and completes a plug-in action.

[0041] The working process of the present invention is as follows: after the transformer to be tested is transported to the testing cabin, the robot arm 90 moves its axes through planning, so that the plug post 201 on the clamp 200 of the transformer inspection fixture is inserted into the socket 121 of the transformer inspection fixture 100, and the transformer inspection fixture 100 is grasped, and the driving mechanism 202 drives the two plug posts 201 to move relative to each other, so that the two jaws 11 are opened away from each other. At this time, the robot arm 90 quickly approaches the screw to be plugged in. Due to the effect of the pre-tightening spring 20, the plug post 201 has a large friction force along the side perpendicular to the extension direction of the pre-tightening spring 20, so that the transformer inspection fixture 100 will not fall off the plug post 201; when the target screw is between the two jaws 11, ..., and the robot arm 90 quickly approaches the screw to be plugged in. Due to the effect of the pre-tightening spring 20, the plug post 201 has a large friction force along the side perpendicular to the extension direction of the pre-tightening spring 20, so that the transformer inspection fixture 100 will not fall off the plug post 201; when the target screw is between the two The driving mechanism 202 drives the two plug posts 201 to move relative to each other, the two jaws 11 approach each other, and the screw begins to contact the elastic probe 14. At this time, the elastic probe 14 in the contact area retracts, and the position of the elastic probe 14 in the non-contact area remains unchanged. The elastic probe 14 forms an envelope around the screw. When the force sensor senses that the pressure on the side of the plug post 201 is reduced to 0, the robot arm 90 moves in a direction parallel to the penetration direction of the socket 121 and away from the transformer gauge 100, and the plug post 201 and the transformer gauge 100 are separated. The transformer gauge 100 is fixed on the screw of the transformer due to the action of the preload spring 20. At this time, a plug-in action is completed, preparing for the subsequent power-on of the transformer gauge 100 to detect the transformer.

[0042] In summary, the embodiment of the present invention provides a transformer inspection fixture 100 and a clamping jaw 200 for the transformer inspection fixture. Since the sides opposite to the jaw portion 11 of the transformer inspection fixture 100 are provided with a plurality of elastic probes 14 arranged in an array, the screws are enclosed during clamping, and the transformer inspection fixture 100 can adapt to screws of different specifications on different types of transformers, which can greatly reduce the types and quantities of required plug-in terminals, greatly simplify the detection operation procedure, improve the detection efficiency, and avoid the cable entanglement problem in a compact space; the clamping jaw 200 for the transformer inspection fixture can automatically clamp the transformer inspection fixture 100 to the fixing screws of the transformer without manual operation.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A high voltage transformer test fixture for measurement, characterized in that: include: Two pliers, each of which comprises a jaw portion, a pliers handle portion and a pivoting portion between the jaw portion and the pliers handle portion, the two pivoting portions are pivotally connected, and a plurality of elastic probes are respectively disposed on opposite sides of the two jaw portions; A preload spring, the two ends of which are respectively connected to the two clamp handles; Wherein, when the preload spring is in an initial state, the two jaw portions abut against each other under the action of the preload spring.

2. The high-voltage transformer test fixture for measurement according to claim 1, characterized in that: It also includes a rotating shaft, through which the two pivoting parts are pivotally connected.

3. The high-voltage transformer gauge for measurement according to claim 2, characterized in that: The pliers handle is provided with an insertion hole, and the insertion hole penetrates through two side surfaces of the pliers handle in a direction parallel to the axis of the rotating shaft.

4. The high-voltage transformer test fixture for measurement according to claim 3, characterized in that: The two end edges of the clamp handle adjacent to the insertion hole are respectively provided with guiding surfaces.

5. The high-voltage transformer test fixture for measurement according to claim 3, characterized in that: The jack is a square hole.

6. The high-voltage transformer test fixture for measurement according to claim 5, characterized in that: Two opposite hole walls of the square hole are parallel to the extending direction of the preload spring.

7. The high-voltage transformer test fixture for measurement according to claim 1, characterized in that: The pliers body also includes a probe cover plate, which is detachably connected to the jaw portion. The elastic probe is arranged on one side of the probe cover plate. The elastic probe includes a needle and a spring. One end of the spring is connected to the probe cover plate, and the other end of the spring is connected to the needle.

8. The high-voltage transformer test fixture for measurement according to claim 1, characterized in that: The elastic probe is a copper elastic probe.

9. The high-voltage transformer test fixture for measurement according to claim 1, characterized in that: The end of the elastic probe facing away from the jaw portion is hemispherical.

10. A clamping jaw for a high-voltage transformer inspection tool for measurement, characterized in that: It comprises two plugs and a driving mechanism for driving the two plugs to move closer or farther away, the plugs are used to be inserted into the sockets of the transformer inspection fixture according to claim 3 one by one, and the driving mechanism is also provided with a flange structure, which is used to connect with the six-axis robot arm.

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