Portable insulation resistance tester

Abstract

The utility model relates to the technical field of insulation resistance testers, in particular to a portable insulation resistance tester, which comprises an insulation resistance tester main body and two test meter hands respectively connected with the insulation resistance tester main body through cables. The back surface of the insulation resistance tester main body is provided with two winding mechanisms which are respectively used for automatically winding two cables, the back surface of the insulation resistance tester main body is provided with a positioning mechanism which is used for fixing the cables, and the winding mechanisms are arranged, so that the cables can be automatically curled and stored after the use is completed; the insulation resistance tester is simple in structure and convenient to carry and store, two cables can be fixed at the same time during testing by arranging the positioning mechanism, and the stability of the insulation resistance tester body during use is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of insulation resistance testers, in particular to a portable insulation resistance tester. Background Art

[0002] Insulation resistance testers are mainly used to measure the insulation resistance of large transformers, mutual inductors, generators, high-voltage motors, power capacitors, power cables, lightning arresters and other equipment. The insulation resistance tester tests various equipment by connecting the equipment with connecting wires, thereby detecting the insulation resistance of the equipment through the current flowing inside the wires. The test results can be obtained by comparing the test results with the standard values.

[0003] The insulation resistance tester is generally connected to the object to be tested through the test needle, and the test needle is connected to the tester through the wire. The existing tester is generally not convenient to directly remove the wire and then curl it up for storage, and then install and fix it when using it, which is rather troublesome. Summary of the invention

[0004] The purpose of the utility model is to provide a portable insulation resistance tester to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a portable insulation resistance tester, comprising an insulation resistance tester body and two test needles connected to the insulation resistance tester body through cables, two winding mechanisms for automatically winding two cables are arranged on the back of the insulation resistance tester body, and a positioning mechanism for fixing the cables is arranged on the back of the insulation resistance tester body.

[0006] Furthermore, the winding mechanism includes an outer shell fixed on the back of the insulation resistance tester body, a winding shaft rotatably arranged inside the outer shell, and a coil spring fixed at one end of the winding shaft, the winding shaft is fixedly connected to the central free end of the coil spring, and the other free end of the coil spring is fixedly connected to the outer shell.

[0007] Furthermore, the positioning mechanism includes two pressing plates respectively used to press the two cables against the back of the insulation resistance tester body and an elastic reset member connecting the pressing plate and the insulation resistance tester body. The two pressing plates are connected by a connecting plate. The back of the insulation resistance tester body is provided with a locking member for locking the connecting plate toward a side close to the insulation resistance tester body, so that the pressing plate moves toward a side close to the insulation resistance tester body to press and fix the cables. The elastic reset member is used to push the pressing plate to move toward a side away from the insulation resistance tester body.

[0008] Furthermore, elastic reset parts are provided on both sides of the pressure plate, and the elastic reset parts include a guide rod vertically fixed on the back of the insulation resistance tester body and a spring sleeved on the outside of the guide rod. A through hole is penetrated on the pressure plate to accommodate the guide rod, and a limiting block is fixed after the guide rod passes through the through hole.

[0009] Furthermore, the locking piece is a U-shaped elastic structure with an opening facing upward, and limiting protrusions are arranged on both sides of the opening of the locking piece, and a positioning hole matching the locking piece is penetrated through the connecting plate.

[0010] Furthermore, two fixing seats for fixing two test needles are arranged on the back of the insulation resistance tester body.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The portable insulation resistance tester can automatically roll up and store the cables after use by setting a reeling mechanism, which is convenient for carrying and storage. The positioning mechanism can fix two cables at the same time during the test, thereby improving the stability of the insulation resistance tester body during use.

[0013] By setting a fixing seat, the two test needles can be clamped and fixed on the back of the insulation resistance tester body, which reduces the occupied space and reduces the collision and wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model in cross section from the back;

[0015] Figure 2 This is a schematic diagram of the front three-dimensional structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the winding mechanism of the utility model;

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the positioning mechanism of the utility model.

[0018] In the figure: 1. Insulation resistance tester body; 2. Test needle; 3. Cable; 4. Winding mechanism; 401. Outer shell; 402. Winding shaft; 403. Winding spring; 5. Positioning mechanism; 501. Pressing plate; 502. Elastic reset member; 5021. Guide rod; 5022. Spring; 503. Connecting plate; 5031. Positioning hole; 504. Locking member; 5041. Limiting protrusion; 6. Fixed seat. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "setting" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood in specific circumstances. In addition, in the description of the utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0020] See also Figure 1-4 The utility model provides an embodiment: a portable insulation resistance tester, comprising an insulation resistance tester body 1 and two test needles 2 respectively connected to the insulation resistance tester body 1 through cables 3, and two fixing seats 6 respectively used to fix the two test needles 2 are arranged on the back of the insulation resistance tester body 1. Specifically, a groove with an arc-shaped cross section is arranged on the side of the fixing seat 6 away from the insulation resistance tester body 1, and limiting convex rings are arranged on both sides of the outer wall of the test needle 2 along its length direction. When not in use, the test needle 2 can be directly inserted into the inner side of the fixing seat 6, and the limiting convex rings abut against the two ends of the fixing seat 6 in the length direction to play a limiting role;

[0021] The back of the insulation resistance tester body 1 is provided with two winding mechanisms 4 for automatically winding two cables 3, respectively. The winding mechanism 4 includes an outer shell 401 fixed to the back of the insulation resistance tester body 1, a winding shaft 402 rotatably arranged inside the outer shell 401, and a coil spring 403 fixed to one end of the winding shaft 402. The winding shaft 402 is fixedly connected to the central free end of the coil spring 403, and the other free end of the coil spring 403 is fixedly connected to the outer shell 401. One end of the cable 3 is connected to the insulation resistance tester body 1. The outer shell 401 is connected to the main body 1 of the resistance tester, and the other end is wound on the reel 402 and then extends to the outside of the outer shell 401 and is connected to the test needle 2. When the test needle 2 is pulled, the reel 402 is driven to rotate, and then the coil spring 403 is driven to reel. When the test needle 2 is released, the reel 402 rotates in the opposite direction under the elastic action of the coil spring 403, and then the cable 3 is automatically reeled on the reel 402. In order to facilitate maintenance, the outer shell 401 can be set to be detachably connected to the main body 1 of the insulation resistance tester;

[0022] The back of the insulation resistance tester body 1 is provided with a positioning mechanism 5 for fixing the cable 3. The positioning mechanism 5 includes two pressing plates 501 for respectively pressing the two cables 3 against the back of the insulation resistance tester body 1 and an elastic reset member 502 connecting the pressing plates 501 and the insulation resistance tester body 1. The two pressing plates 501 are connected by a connecting plate 503. The back of the insulation resistance tester body 1 is provided with a locking member 504 for locking the connecting plate 503 toward a side close to the insulation resistance tester body 1, so that the pressing plate 501 moves toward a side close to the insulation resistance tester body 1 to fix the cable 3. The elastic reset member 502 is used to push the pressing plate 501 to move to the side away from the insulation resistance tester body 1. In this embodiment, the two pressing plates 501 are respectively arranged inside the two outer shells 401, and the side walls of the outer shells 401 are penetrated with through holes for accommodating the connection plate 503 to move back and forth along the side close to or away from the insulation resistance tester body 1. The cable 3 connected to the test needle 2 passes between the pressing plate 501 and the insulation resistance tester body 1, and then extends to the outside through the through hole. In order to improve the pressing effect, an elastic rubber pad can be provided on the side of the pressing plate 501 close to the cable 3;

[0023] Elastic reset members 502 are provided on both sides of the pressing plate 501. The elastic reset members 502 include a guide rod 5021 vertically fixed to the back of the insulation resistance tester body 1 and a spring 5022 sleeved on the outside of the guide rod 5021. A through hole for accommodating the guide rod 5021 is provided on the pressing plate 501, and a limited block is fixed after the guide rod 5021 passes through the through hole. The spring 5022 is provided between the pressing plate 501 and the insulation resistance tester body 1. The pressing plate 501 can slide back and forth along the length direction of the guide rod 5021 to improve the stability of its movement. The spring 5022 can push the pressing plate 501 to separate from the cable 3, so that the winding mechanism 4 can automatically wind up the cable 3.

[0024] The locking member 504 is a U-shaped elastic structure with its opening facing upward, and limited protrusions 5041 are provided on both sides of the opening of the locking member 504. A positioning hole 5031 matching the locking member 504 is provided through the connecting plate 503. Figure 4 , a guide slope is arranged on one side of the limiting protrusion 5041 so as to facilitate the passage through the interior of the positioning hole 5031. When the locking piece 504 is inserted into the interior of the positioning hole 5031, the top of the locking piece 504 is first squeezed and deformed toward the middle, and the limiting protrusion 5041 passes through the interior of the positioning hole 5031 and then opens to abut against the end surface of the connecting plate 503 to achieve fixation. It is convenient and quick to use. In order to improve the fixing effect, multiple locking pieces 504 can also be provided as needed;

[0025] Furthermore, in order to improve the stability of the insulation resistance tester body 1 during measurement, a non-slip rubber pad or suction cup (not shown in the figure) can be set on the back of the outer shell 401 to prevent it from sliding back and forth and affecting the test when placed on a desktop or workplace.

[0026] Working principle: During the test, the test needle 2 is directly pulled outward, one end of the cable 3 is connected to the insulation resistance tester body 1, and the other end is wound around the outside of the reel 402, and then extended to the outside of the outer shell 401 and connected to the test needle 2. The test needle 2 is pulled to drive the reel 402 to rotate, compress the coil spring 403, and after adjusting the pull-out length of the cable 3, the connecting plate 503 is directly pressed downward, and after the top of the locking piece 504 passes through the positioning hole 5031, the limiting protrusion 5041 abuts against the two sides of the top of the connecting plate 503 to fix it, and the connecting plate 503 drives the two pressure plates 501 to close Move to one side of the insulation resistance tester body 1 to compress the elastic reset piece 502, and press and fix the cable 3 on the back of the insulation resistance tester body 1 to prevent the cable 3 from automatically winding up under the elastic action of the winding spring 403, which affects the measurement. After the measurement is completed, pinch the two limiting protrusions 5041 toward the middle, and the spring 5022 pushes the pressure plate 501 and the connecting plate 503 to reset upward, so that the locking piece 504 and the connecting plate 503 are separated. At this time, the cables 3 on both sides are automatically wound on the winding shaft 402 under the elastic action of the winding spring 403, and then the test needle 2 is clamped on the inner side of the fixing seat 6.

[0027] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. Portable insulation resistance tester, characterized by: The insulation resistance tester comprises an insulation resistance tester body (1) and two test needles (2) respectively connected to the insulation resistance tester body (1) via cables (3); the back of the insulation resistance tester body (1) is provided with two winding mechanisms (4) respectively used for automatically winding the two cables (3); the back of the insulation resistance tester body (1) is provided with a positioning mechanism (5) used for fixing the cables (3); The winding mechanism (4) comprises an outer shell (401) fixed to the back of the insulation resistance tester body (1), a winding shaft (402) rotatably arranged inside the outer shell (401), and a coil spring (403) fixed to one end of the winding shaft (402), the winding shaft (402) being fixedly connected to the central free end of the coil spring (403), and the other free end of the coil spring (403) being fixedly connected to the outer shell (401); The positioning mechanism (5) comprises two pressing plates (501) respectively used to press the two cables (3) against the back of the insulation resistance tester body (1) and an elastic reset member (502) connecting the pressing plates (501) and the insulation resistance tester body (1); the two pressing plates (501) are connected via a connecting plate (503); a locking member (504) is provided on the back of the insulation resistance tester body (1) for locking the connecting plate (503) toward a side close to the insulation resistance tester body (1), so that the pressing plate (501) moves toward a side close to the insulation resistance tester body (1) to press and fix the cables (3); and the elastic reset member (502) is used to push the pressing plate (501) to move toward a side away from the insulation resistance tester body (1).

2. The portable insulation resistance tester according to claim 1, characterized in that: Elastic reset members (502) are provided on both sides of the pressure plate (501), and the elastic reset members (502) include a guide rod (5021) vertically fixed to the back of the insulation resistance tester body (1) and a spring (5022) sleeved on the outside of the guide rod (5021); a through hole for accommodating the guide rod (5021) to pass through is provided on the pressure plate (501), and a limit block is fixed after the guide rod (5021) passes through the through hole.

3. The portable insulation resistance tester according to claim 1, characterized in that: The locking piece (504) is a U-shaped elastic structure with an opening facing upward, and limiting protrusions (5041) are arranged on both sides of the opening of the locking piece (504), and a positioning hole (5031) matching the locking piece (504) is arranged through the connecting plate (503).

4. The portable insulation resistance tester according to claim 1, characterized in that: Two fixing seats (6) for fixing two test needles (2) are arranged on the back of the insulation resistance tester body (1).

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