A plum blossom contact finger pressure testing device

Abstract

The present invention solves the problem that the finger pressure test device in the prior art needs to be disassembled for testing, which may cause damage to the plum blossom contact. The present invention comprises a test gun, an elastic expansion detection ring and a test probe. The test probe is fixedly connected to the gun head of the test gun. The elastic expansion detection ring is movably sleeved on the outside of the test probe. The elastic expansion detection ring is formed by a plurality of fan-shaped expansion units tightly spliced ​​in an annular shape. The inner side of the fan-shaped expansion unit is an inner arc surface. The distance between the inner arc surface and the axis of the outer arc of the fan-shaped expansion unit gradually decreases in the counterclockwise direction. A groove is provided at the clockwise end of the inner arc surface on the fan-shaped expansion unit. The bottom surface of the groove is tangent to the inner arc surface of the adjacent fan-shaped expansion unit. The present invention solves the problem that the finger pressure test device in the prior art needs to be disassembled for testing, which may cause damage to the plum blossom contact.

Description

Technical Field

[0001] The invention relates to a plum blossom contact finger pressure testing device, belonging to the technical field of isolating switch testing equipment. Background Art

[0002] Spring contacts are a new type of electrical connection method in the high-voltage switch industry. They have the advantages of simple structure, easy installation, strong current capacity, and cost savings. They are widely used in medium and high voltage circuit breakers and disconnectors. The performance of spring contacts directly affects the operation of the entire power grid. The electrical performance of spring contacts is directly related to the performance of the spring and the pressure exerted by the spring on the contacts.

[0003] When the plum blossom contact is being repaired, it needs to be disassembled and then tested with special equipment. However, due to its special structure, the plum blossom contact is easily damaged during the disassembly process.

[0004] The patent document with the prior art application number CN201811207561.3 discloses a sensor that can measure the contact pressure of various types of disconnectors, which solves the defect that it is difficult to measure the contact pressure of high-voltage disconnectors compared with the prior art. The sensor of the present invention is installed on the fixed handle by bolts, and a reference stopper is installed at the front end of the movable handle. The measuring head of the sensor is installed at the front end of the fixed handle. The contact of the reference stopper and the contact of the measuring head are located on the same horizontal line. The contact of the reference stopper and the contact of the measuring head are both facing the outside of the pressure sensor assembly. An adjusting bolt is threadedly installed on the fixed handle, and the axial direction of the adjusting bolt is located in the movement direction of the movable handle, and the front end of the adjusting bolt points to the movable handle.

[0005] The above-mentioned reference examples and the contact finger pressure testing devices of the prior art have the problem that they need to be disassembled for testing and are prone to damage to the plum blossom contacts. Therefore, the present invention provides a plum blossom contact contact finger pressure testing device for solving the above-mentioned problems. Summary of the invention

[0006] In order to overcome the shortcomings of existing contact finger pressure testing devices, such as the need to be disassembled for testing and easy damage to the plum blossom contact, the present invention designs a plum blossom contact contact finger pressure testing device. The present invention has a simple structure and can test the tension of the plum blossom contact hoop spring and determine whether the hoop spring is fatigued and aged.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A plum blossom contact finger pressure test device comprises a test gun, an elastic expansion detection ring and a test probe, wherein the test probe is fixedly connected to the gun head of the test gun, the elastic expansion detection ring is movably sleeved outside the test probe, and the elastic expansion detection ring is formed by a plurality of fan-shaped expansion units tightly spliced ​​in an annular shape, the inner side of the fan-shaped expansion unit is an inner arc surface, and the distance between the inner arc surface and the axis of the outer arc surface of the fan-shaped expansion unit is gradually reduced in the counterclockwise direction (see Figure 3 ), a groove is provided at the clockwise end of the inner arc surface of the fan-shaped expansion unit, and the bottom surface of the groove is tangent to the inner arc surface of the adjacent fan-shaped expansion unit; the annular array on the outer surface of the test probe is provided with convex teeth of the same number as the fan-shaped expansion unit, and the convex teeth are adapted to the groove; a spring groove is provided on the outer side wall of the fan-shaped expansion unit, and a circle of spring binding hoop is connected to the outer sleeve of the elastic expansion detection ring, and the spring binding hoop is arranged in the spring groove.

[0009] The fan-shaped expansion unit is provided with a connection groove on one side close to the groove, and a connection block on the other side. The connection block on one side of the fan-shaped expansion unit is accommodated in the connection groove of the adjacent fan-shaped expansion unit and is slidably connected with the connection groove.

[0010] The inner end of the fan-shaped expansion unit protrudes upward to form a boss.

[0011] The inner end of the fan-shaped expansion unit protrudes upward and downward to form a boss.

[0012] One end of the connection groove close to the outer surface of the fan-shaped expansion unit is open, and the sum of the length of the connection block and the length of the groove is smaller than the connection groove.

[0013] The number of the plurality of fan-shaped expansion units is at least three.

[0014] A through hole for connecting with a test gun is provided in the middle of the test probe, and the through hole passes through two ends of the test probe along the axis of the test probe.

[0015] Compared with the prior art, the present invention has the following characteristics and beneficial effects: the present invention drives the test probe to rotate through the test gun, and the rotation of the test probe causes the fan-shaped expansion unit on the elastic expansion detection ring to expand outward, thereby realizing the test without disassembling the plum blossom contact, avoiding the disassembly damage of the plum blossom contact, and ensuring the integrity and performance of the contact;

[0016] The fan-shaped expansion unit of the present invention is provided with a connection groove and a connection block, and the cooperation between the connection groove and the connection block prevents the elastic expansion detection ring from falling apart when expanding outward, thereby ensuring the stability of the structure;

[0017] The inner end of the fan-shaped expansion unit of the present invention protrudes upward to form a boss, which increases the contact area between the test probe and the elastic expansion detection ring, making the force transmission more stable and safe;

[0018] The elastic expansion detection ring of the present invention is formed by a circular array of at least three fan-shaped expansion units. The multiple fan-shaped expansion units enable the tensioning force of the plum blossom contact to be transmitted more accurately, thereby ensuring the accuracy of the value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the assembly schematic structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the partial assembly structure of the elastic expansion detection ring in the present invention;

[0021] Figure 3 It is a top view of the local assembly structure of the elastic expansion detection ring in the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the fan-shaped expansion unit in the present invention;

[0023] Figure 5 It is a top view of the fan-shaped expansion unit in the present invention.

[0024] The accompanying drawings are marked as follows: 1. test gun; 2. elastic expansion detection ring; 20. fan-shaped expansion unit; 21. boss; 22. inner arc surface; 23. groove; 24. connecting block; 25. connecting groove; 26. spring groove; 30. test probe; 31. convex tooth; 32. through hole; 40. spring hoop. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] like Figure 1-5As shown, the plum blossom contact finger pressure test device of this embodiment includes a test gun 1, an elastic expansion detection ring 2 and a test probe 30, the test probe 30 is fixedly connected to the gun head of the test gun 1, the elastic expansion detection ring 2 is movably sleeved outside the test probe 30, the elastic expansion detection ring 2 is formed by a plurality of fan-shaped expansion units 20 tightly spliced ​​in an annular shape, the inner side of the fan-shaped expansion unit 20 is an inner arc surface 22, and the distance between the inner arc surface 22 and the axis of the outer arc surface of the fan-shaped expansion unit 20 is gradually reduced in the counterclockwise direction. A groove 23 is formed at the clockwise end of the inner arc surface 22 of the fan-shaped expansion unit 20, and the bottom surface of the groove 23 is tangent to the inner arc surface 22 of the adjacent fan-shaped expansion unit 20; a ring array is provided on the outer surface of the test probe 30 with convex teeth 31 of the same number as the fan-shaped expansion unit 20, and the convex teeth 31 are adapted to the groove 23; a spring groove 26 is formed on the outer side wall of the fan-shaped expansion unit 20, and a circle of spring hoop 40 is connected to the outer cover of the elastic expansion detection ring 2, and the spring hoop 40 is arranged in the spring groove 26.

[0027] Furthermore, a connecting groove 25 is provided on one side of the fan-shaped expansion unit 20 close to the groove 23 , and a connecting block 24 is provided on the other side. The connecting block 24 on one side of the fan-shaped expansion unit 20 is accommodated in the connecting groove 25 of the adjacent fan-shaped expansion unit 20 and is slidably connected to the connecting groove 25 .

[0028] Furthermore, the inner end of the fan-shaped expansion unit 20 protrudes upward to form a boss 21 .

[0029] Furthermore, the inner end of the fan-shaped expansion unit 20 protrudes upward and downward to form a boss 21.

[0030] Furthermore, one end of the connection groove 25 close to the outer surface of the fan-shaped expansion unit 20 is open, and the sum of the length of the connection block 24 and the length of the groove 23 is smaller than the connection groove 25 .

[0031] Furthermore, the number of the plurality of fan-shaped expansion units 20 is at least three.

[0032] Furthermore, a through hole 32 for connecting with the test gun 1 is provided in the middle of the test probe 30 , and the through hole 32 passes through both ends of the test probe 30 along the axis of the test probe 30 .

[0033] The working principle of the present invention is as follows: first, the test probe 30 is fixed on the head of the test gun 1 by means of a hand screw and a flat washer, the test probe 30 is adjusted to be connected to the test gun 1 by wire, and the test gun 1 is adjusted to be connected to the test host by wireless, and then the connecting block 24 on the fan-shaped expansion unit 20 is inserted into the connecting groove 25 of the adjacent fan-shaped expansion unit 20, and the three fan-shaped expansion units 20 are arranged in this annular array to form an elastic expansion detection ring 2, and then the elastic expansion detection ring 2 is sleeved on the outside of the test probe 30, and at this time, the protruding teeth 31 of the test probe 30 are respectively located in the grooves 23 of the fan-shaped expansion unit 20;

[0034] Then, zeroing is performed. First, a short tube with the same aperture as the aperture of the switch cabinet interface is prepared. Then, the end face of the elastic expansion detection ring 2 is pressed against the short tube so that the elastic expansion detection ring 2 does not rotate. The test gun 1 is rotated to expand the fan-shaped expansion unit 20. The tension of the spring hoop 40 is measured and zeroing is performed.

[0035] During the test, the elastic expansion detection ring 2 is inserted into the plum blossom contact to be tested, and the end face of the elastic expansion detection ring 2 is pressed against the switch cabinet interface so that the elastic expansion detection ring 2 does not rotate. The test gun 1 is rotated to drive the test probe 30 to rotate. Since the inner arc surface 22 is smooth enough, the rotation of the test probe 30 causes the fan-shaped expansion unit 20 to expand slightly. After the slight expansion, the outer ring of the fan-shaped expansion unit 20 presses against the plum blossom contact so that the plum blossom contact generates a pressing force on the fan-shaped expansion unit 20. Due to the existence of the pressing force, the test gun 1 is continued to be rotated, and the elastic expansion detection ring 2 no longer rotates, and the tension of the plum blossom contact is measured;

[0036] After the first measurement is completed, the position of the elastic expansion detection ring 2 is slightly adjusted and rotated, and the measurement is performed again. This is repeated three times in sequence to reduce the error caused by eccentricity.

[0037] In the description of the invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0038] In the invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the invention according to the specific circumstances.

[0039] Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A plum blossom contact finger pressure test device, characterized in that: The invention comprises a test gun (1), an elastic expansion detection ring (2) and a test probe (30), wherein the test probe (30) is fixedly connected to the gun head of the test gun (1), the elastic expansion detection ring (2) is movably sleeved outside the test probe (30), the elastic expansion detection ring (2) is formed by a plurality of fan-shaped expansion units (20) tightly spliced ​​in an annular shape, the inner side of the fan-shaped expansion unit (20) is an inner arc surface (22), the distance between the inner arc surface (22) and the axis of the outer arc surface of the fan-shaped expansion unit (20) is gradually reduced in the counterclockwise direction, the inner arc surface (22) of the fan-shaped expansion unit (20) is provided with a groove (23) at the clockwise end, and the bottom surface of the groove (23) is tangent to the inner arc surface (22) of the adjacent fan-shaped expansion unit (20); The outer surface of the test probe (30) is provided with a ring array of protruding teeth (31) having the same number as the fan-shaped expansion unit (20), and the protruding teeth (31) are matched with the grooves (23); The outer side wall of the fan-shaped expansion unit (20) is provided with a spring groove (26), the outer surface of the elastic expansion detection ring (2) is connected with a spring hoop (40), and the spring hoop (40) is arranged in the spring groove (26).

2. A plum blossom contact finger pressure testing device according to claim 1, characterized in that: The fan-shaped expansion unit (20) is provided with a connection groove (25) on one side close to the groove (23), and a connection block (24) on the other side. The connection block (24) on one side of the fan-shaped expansion unit (20) is accommodated in the connection groove (25) of the adjacent fan-shaped expansion unit (20) and is slidably connected to the connection groove (25).

3. A plum blossom contact finger pressure testing device according to claim 1, characterized in that: The inner end of the fan-shaped expansion unit (20) protrudes upward to form a boss (21).

4. A plum blossom contact finger pressure testing device according to claim 3, characterized in that: The inner end of the fan-shaped expansion unit (20) protrudes upward and downward at both ends to form a boss (21).

5. A plum blossom contact finger pressure testing device according to claim 2, characterized in that: One end of the connection groove (25) close to the outer surface of the fan-shaped expansion unit (20) is open, and the sum of the length of the connection block (24) and the length of the groove (23) is smaller than the connection groove (25).

6. A plum blossom contact finger pressure testing device according to claim 1, characterized in that: The number of the plurality of fan-shaped expansion units (20) is at least three.

7. A plum blossom contact finger pressure testing device according to claim 1, characterized in that: A through hole (32) for connecting to a test gun (1) is provided in the middle of the test probe (30), and the through hole (32) passes through both ends of the test probe (30) along the axis of the test probe (30).

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