Tools for convenient detection of cable insulation and methods of use thereof

Abstract

A tool for conveniently detecting cable insulation and a method of using the tool, including a base plate and an insulation detection instrument, wherein a wiring terminal is provided on the base plate, one end of the wiring terminal is connected to a conductive plate through an intermediate wire, and the conductive plate is located in a cable fixture; the cable fixture includes a cable jack, the end of the cable jack is connected to a conductive plate active cavity, the side wall of the cable jack is connected to a cable fixing airbag placement cavity, an elastic diaphragm is provided between the conductive plate active cavity and the cable jack, and the elastic diaphragm is connected to the conductive plate; a pipeline hole is provided at the end of the conductive plate active cavity, and the intermediate wire runs through the pipeline hole; the conductive plate active cavity is connected to an air supply device through a pipeline or an airway, and a cable fixing airbag is provided in the cable fixing airbag placement cavity. The present invention can save manpower and time, and can quickly complete the insulation detection of multi-core cables or several cables; no additional wire stripping process is required, and no operator is required to hold the cable core wire, thereby avoiding the risk of electric shock.

Description

Technical Field

[0001] The invention belongs to the technical field of cable insulation inspection, and in particular relates to a tool for conveniently inspecting cable insulation and a use method thereof. Background Art

[0002] At present, megohmmeters are widely used to test cable insulation. Generally, power cables are multi-core cables. Before installation, the cables need to be tested for insulation between wires and insulation to the ground. In addition, there are many cables, so in order to improve the detection efficiency, multiple labor forces need to be invested. In response to the above technical problems, more and more people have begun to study equipment that facilitates cable insulation detection. For example, a cable insulation detection auxiliary device disclosed in Chinese patent document CN207908618U connects multiple cables in a circuit and then performs insulation detection at one time. However, the extent to which this technical solution improves work efficiency is not high, because the staff still need to strip the cable and then fix the cable to the terminal block of the detection equipment (the fixing method is generally screw fixing), so the work efficiency is not significantly improved. Summary of the invention

[0003] In view of the technical problems existing in the background technology, the tool for facilitating the detection of cable insulation and the method of using the tool provided by the present invention can save manpower and time, and can quickly complete the insulation detection of multi-core cables or several cables; no additional wire stripping process is required, and there is no need for operators to hold the cable core wires, thereby avoiding the risk of electric shock.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve:

[0005] A tool for conveniently testing cable insulation, comprising a base plate and an insulation testing instrument, wherein a wiring terminal is arranged on the base plate, one end of the wiring terminal is connected to a conducting voltage plate through an intermediate wire, and the conducting voltage plate is located in a cable fixing member; one end of a plurality of wiring terminals is connected in parallel through a short-circuit wire, and an intermediate switch is arranged on the short-circuit wire;

[0006] The cable fixing part comprises a cable jack, the end of the cable jack is connected to the active cavity of the conductive voltage plate, the side wall of the cable jack is connected to the cable fixing airbag placement cavity, an elastic diaphragm is arranged between the active cavity of the conductive voltage plate and the cable jack, and the elastic diaphragm is connected to the conductive voltage plate; a pipeline hole is arranged at the end of the active cavity of the conductive voltage plate, and the middle wire runs through the pipeline hole;

[0007] The active cavity of the conductive voltage plate is connected with the air supply device through a pipeline or an airway, and a cable fixing air bag is arranged in the cable fixing air bag placement cavity.

[0008] In a preferred solution, the conductive pressure plate includes an outer sheath connected to the middle conductor, the outer sheath is connected to a pressure plate, the pressure plate is located in the cable jack, and the pressure plate is used to contact the conductive core of the end face of the tested cable.

[0009] In a preferred embodiment, the cable fixing is a plate-type structure, and the cable fixing includes a plurality of cable jacks arranged side by side, each cable jack corresponds to a conductive voltage plate active cavity and a cable fixing airbag placement cavity, and the plurality of conductive voltage plate active cavities are all connected to the air flow channel, and the air flow channel is connected to the main air source pipe through a plurality of branch pipes, and the main air source pipe is connected to the air supply device.

[0010] In a preferred embodiment, an arc-shaped groove is provided in the air flow channel, a rotatable gas on-off knob is provided in the arc-shaped groove, the gas on-off knob includes a rotating shaft column, a straight handle is provided on the top of the rotating shaft column, an inverted L-shaped channel is provided, an air inlet of the inverted L-shaped channel is connected to a branch pipe, and an air outlet of the inverted L-shaped channel is provided on the side wall of the rotating shaft column.

[0011] In a preferred solution, the air supply device is an air pump, the air pump and the cable fixing member are both arranged on the bottom plate, and the air pump is connected to the main air source pipe through an outlet pipe.

[0012] In a preferred solution, a pressure sensor is provided on the outlet pipeline, and the pressure sensor is used to monitor the outlet pressure of the air pump.

[0013] In a preferred solution, a control box is provided on the base plate.

[0014] In a preferred embodiment, the cable fixing airbag comprises a hard hollow shell, a strip-shaped airbag is provided on the top surface of the hard hollow shell, and one end of the hard hollow shell is opened for communicating with the active cavity of the conductive plate; the cross-section of the cavity for placing the cable fixing airbag is in an inverted T shape.

[0015] In a preferred solution, the number of the wiring terminals matches the number of cable jacks, one end of the plurality of wiring terminals are connected in parallel via a short-circuit wire, and after being connected in parallel, they are connected to the test lead connection column via the short-circuit wire, and the insulation detection instrument is a megohmmeter; an intermediate switch is provided on the short-circuit wire.

[0016] In a preferred embodiment, the method for using the tool for facilitating the detection of cable insulation comprises the following steps:

[0017] Insert the tested cable that needs insulation testing into the cable jack. The tested cable does not need to be stripped. The tested cable can be one or more cables.

[0018] When conducting insulation test to earth;

[0019] Step 1: connect two test leads of the insulation tester to the test lead connection column and the ground terminal respectively, wherein one end of a plurality of wiring terminals is connected in parallel and then connected to the test lead connection column through a short-circuit wire;

[0020] Step 2: Turn the gas on / off knob corresponding to the tested cable to the on position; turn on the gas supply device, and the elastic diaphragm and the cable fixing airbag expand and deform at the same time. The cable fixing airbag is used to clamp the tested cable, and the elastic diaphragm pushes the conductive voltage plate to contact the conductive wire core of the tested cable end face;

[0021] Step 3: Turn on the insulation tester to perform insulation testing;

[0022] Step 4: After the insulation test is completed, the gas supply device will be turned off and the gas on-off knob will be reset;

[0023] When conducting phase-to-phase insulation test, connect the two test leads in step 1 to the two wiring terminals respectively, and turn the middle switch to the disconnected state, and repeat steps 2 to 4.

[0024] This patent can achieve the following beneficial effects:

[0025] 1. There is no need to strip the cable under test. After the cable under test is inserted into the cable jack, the air supply device is turned on. The cable fixing airbag is used to squeeze and fix the cable under test. The elastic diaphragm is deformed to make the conductive plate contact with the conductive core of the end face of the cable under test. The diameter of the conductive plate is smaller than the diameter of the conductive core, so the stripping operation is omitted.

[0026] 2. Multiple cables to be tested can be inserted into the cable jack at the same time. When performing insulation tests on each cable, you only need to operate the corresponding gas on / off knob.

[0027] 3. It can adapt to tested cables of different diameters, because the redundancy of the cable fixing airbag itself is large, making the adaptability of the entire device wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 This is the general layout diagram of the present invention;

[0030] Figure 2 One of the working principle diagrams of the cable fixing member of the present invention (the elastic diaphragm is not deformed);

[0031] Figure 3 This is the second working principle diagram of the cable fixing member of the present invention (the elastic diaphragm has been deformed);

[0032] Figure 4 This is a structural diagram of the gas on-off knob of the present invention;

[0033] Figure 5 This is a schematic diagram of the conduction principle of the gas on-off knob of the present invention;

[0034] Figure 6This is a structural diagram of the airflow channel of the present invention;

[0035] Figure 7 This is a three-dimensional structural diagram of the cable fixing member of the present invention;

[0036] Figure 8 This is the second three-dimensional structural diagram of the cable fixing member of the present invention;

[0037] Fig. 9 This is a structural diagram of the cable fixing airbag placement cavity of the present invention;

[0038] Fig.10 This is a diagram showing the internal structure of the cable fixing member of the present invention;

[0039] Fig.11 The structure diagram of the cable end face under test;

[0040] Fig.12 This is the structural diagram of the tested cable without stripping;

[0041] Fig.13 This is the structural diagram of the cable under test after stripping.

[0042] In the figure: bottom plate 1, terminal block 2, insulation testing instrument 3, conducting voltage plate 4, outer casing 41, pressure plate 42, middle conductor 5, cable fixing part 6, cable jack 61, conducting voltage plate movable cavity 62, cable fixing airbag placement cavity 63, elastic diaphragm 7, air supply device 8, cable fixing airbag 9, hard hollow shell 91, strip airbag 92, air flow channel 10, main air source pipe 11, arc groove 12, gas on-off knob 13, inverted L-shaped channel 13.1, shaft column 13.2, straight handle 13.3, control box 14, test lead connecting column 15, tested cable 16, middle switch 17. DETAILED DESCRIPTION

[0043] The preferred solution is Figures 1 to 10 As shown, a tool for testing cable insulation comprises a base plate 1, on which a wiring terminal 2 is provided, one end of the wiring terminal 2 is used to connect with a test lead of an insulation testing instrument 3, and the other end of the wiring terminal 2 is connected with a conductive voltage plate 4 through an intermediate wire 5, and the conductive voltage plate 4 is located in a cable fixing member 6;

[0044] The cable fixing member 6 comprises a cable jack 61, the end of which is connected to the conductive plate active cavity 62, the side wall of which is connected to the cable fixing airbag placement cavity 63, an elastic diaphragm 7 is provided between the conductive plate active cavity 62 and the cable jack 61, and the elastic diaphragm 7 is connected to the conductive plate 4; a pipeline hole is provided at the end of the conductive plate active cavity 62, and the middle conductor 5 runs through the pipeline hole;

[0045] The conductive plate active cavity 62 is connected to the air supply device 8 through a pipeline or an air passage, and a cable fixing air bag 9 is arranged in the cable fixing air bag placement cavity 63 .

[0046] The cable jack 61 is used to insert the tested cable 16. The end face of the tested cable 16 is shown in FIG. Fig.11 As shown, the middle is a conductive core, and the outside of the conductive core is an insulating layer; the side view of the tested cable 16 is as shown Fig.12 As shown, no peeling was performed. Fig.13 As shown, in the prior art, the cables need to be stripped before being tested. For power cables, they have a large diameter, heavy weight, and a thick insulation layer, which makes stripping difficult. If there are a large number of cables, the stripping process will take a lot of time.

[0047] The technical solution proposed by the present invention has the following improvements: First, it is not necessary to strip the cable 16 under test. After the cable 16 under test is inserted into the cable jack 61, the air supply device 8 is turned on, and the cable fixing airbag 9 is used to squeeze and fix the cable 16 under test. The elastic diaphragm 7 is deformed to make the conductive plate 4 contact with the conductive core of the end face of the cable 16 under test. The diameter of the conductive plate 4 is smaller than the diameter of the conductive core, thus eliminating the need for stripping. Second, multiple cables 16 under test can be inserted into the cable jack 61 at the same time. When performing insulation tests separately, it is only necessary to operate the corresponding gas on-off knob 13. Third, it can adapt to cables 16 under test of different diameters, because the cable fixing airbag 9 has a large redundancy in its own expansion, which makes the entire device have a wide range of adaptability.

[0048] Furthermore, the conductive pressure plate 4 includes an outer sheath 41 connected to the middle conductor 5 , the outer sheath 41 is connected to a pressure plate 42 , the pressure plate 42 is located in the cable jack 61 , and the pressure plate 42 is used to contact the conductive core of the end face of the tested cable 16 .

[0049] The entire structure of the conducting plate 4 is similar to that of the line nose, but in order to adapt to the technical improvement of the present invention, the conducting plate 4 is designed as a structure of an outer sheath 41 and a pressure plate 42, the outer sheath 41 is connected to the middle conductor 5, and the outer sheath 41 runs through the elastic diaphragm 7, and the connection can be sealed with glue or not treated. During the deformation of the elastic diaphragm 7, the outer sheath 41 will drive the middle conductor 5 to move, and the gap between the middle conductor 5 and the pipeline hole is 0.5-1mm.

[0050] Furthermore, the cable fixing part 6 is a plate-type structure, and the cable fixing part 6 includes a plurality of cable sockets 61 arranged side by side, each cable socket 61 corresponds to a conductive voltage plate active cavity 62 and a cable fixing airbag placement cavity 63, and the plurality of conductive voltage plate active cavities 62 are all connected to the airflow channel 10, and the airflow channel 10 is connected to the main air source pipe 11 through a plurality of branch pipes, and the main air source pipe 11 is connected to the air supply device 8.

[0051] The airflow channel 10 is used to connect multiple conductive plate active chambers 62. In order to individually control the conductive plate active chambers 62, a gas on-off knob 13 is provided at the junction between each conductive plate active chamber 62, so that the conductive plate active chamber 62 can become an adjustable individual chamber. The airflow channel 10 is a linear channel in which multiple conductive plate active chambers 62 are connected in series. The gas of the airflow channel 10 comes from the main gas source pipe 11, which is located below the airflow channel 10.

[0052] Furthermore, an arc-shaped groove 12 is provided in the air flow channel 10, and a rotatable gas on-off knob 13 is provided in the arc-shaped groove 12. The gas on-off knob 13 includes a rotating shaft column 13.2, and a straight handle 13.3 is provided on the top of the rotating shaft column 13.2. The rotating shaft column 13.2 is provided with an inverted L-shaped channel 13.1. The air inlet of the inverted L-shaped channel 13.1 is connected to the branch pipe, and the air outlet of the inverted L-shaped channel 13.1 is arranged on the side wall of the rotating shaft column 13.2.

[0053] The gas on-off knob 13 functions like an on-off switch, and is used to conduct gas flow. Figure 5 , Figure 6 As shown, by rotating the gas on-off knob 13 by 90 degrees, it can be turned on or off. However, compared with the switch valve, the adjustment method of the gas on-off knob 13 is simpler and the manufacturing cost is lower.

[0054] Furthermore, the air supply device 8 is an air pump, and the air pump and the cable fixture 6 are both arranged on the bottom plate 1, and the air pump is connected to the main air source pipe 11 through an outlet pipe. A pressure sensor is arranged on the outlet pipe, and the pressure sensor is used to monitor the outlet pressure of the air pump.

[0055] The air pump can be pressure controlled by a single chip microcomputer to keep the outlet pressure within a certain range. When the air pump is just started, it will provide a large air pressure, but there is a small amount of air leakage in the equipment. When the pressure decreases to a threshold, the air pump can be started again, forming pressure control. A control box 14 is provided on the bottom plate 1, and a start and stop button for controlling the air pump is provided on the control box 14.

[0056] Furthermore, the cable fixing airbag 9 comprises a hard hollow shell 91, a strip airbag 92 is arranged on the top surface of the hard hollow shell 91, one end of the hard hollow shell 91 is opened to communicate with the conductive plate active cavity 62; the cross section of the cable fixing airbag placement cavity 63 is inverted T-shaped. The structure of the cable fixing airbag 9 is easy to install, and after the cable fixing airbag 9 is installed, it can be fixed with glue.

[0057] As an alternative, the cable fixing airbag 9 may be replaced by an air membrane, the structure of which is similar to the elastic diaphragm 7 .

[0058] Furthermore, the number of the wiring terminals 2 matches the number of the cable jacks 61, one end of the plurality of wiring terminals 2 is connected in parallel through a shorting wire, and after being connected in parallel, the insulation detection instrument 3 is a megohmmeter; an intermediate switch 17 is provided on the shorting wire. The probe of the megohmmeter can be an alligator clip.

[0059] When performing an insulation test to ground, one probe of the megohmmeter is used to connect to the probe connecting column 15, and the other probe of the megohmmeter is used to connect to the ground terminal.

[0060] When conducting phase-to-phase insulation testing, the two test leads of the megohmmeter are clamped on the corresponding two wiring terminals 2 to avoid short-circuit problems. An intermediate switch 17 is designed and the intermediate switch 17 is turned to the disconnected state.

[0061] Preferably, a method for using a tool for detecting cable insulation comprises the following steps:

[0062] Insert the tested cable 16 that needs insulation testing into the cable jack 61, and the tested cable 16 does not need to be stripped; the tested cable 16 may be one or more cables;

[0063] When conducting insulation test to earth;

[0064] Step 1: connect two test leads of the insulation tester 3 to the test lead connection column 15 and the ground terminal respectively, wherein one end of a plurality of wiring terminals is connected in parallel and then connected to the test lead connection column 15 through a short-circuit wire;

[0065] Step 2: Turn the gas on / off knob 13 corresponding to the tested cable 16 to the on position; turn on the gas supply device 8, the elastic diaphragm 7 and the cable fixing airbag 9 expand and deform at the same time, the cable fixing airbag 9 is used to clamp the tested cable 16, and the elastic diaphragm 7 pushes the conductive plate 4 to contact the conductive wire core of the end face of the tested cable 16;

[0066] Step 3, start the insulation tester 3 to perform insulation test;

[0067] Step 4: After the insulation test is completed, the gas supply device 8 is stopped and the gas on-off knob 13 is reset;

[0068] When testing the insulation to ground, all the intermediate switches 17 can be turned to the on position, so that multiple cables can be tested in sequence.

[0069] When conducting phase-to-phase insulation test, connect the two test leads in step 1 to the two wiring terminals 2 respectively, and turn the middle switch 17 to the disconnected state, and repeat steps 2 to 4.

[0070] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A tool for testing cable insulation, comprising a base plate (1) and an insulation testing instrument (3), wherein the base plate (1) is provided with a wiring terminal (2), and wherein: One end of the wiring terminal (2) is connected to a conductive voltage plate (4) via an intermediate wire (5), and the conductive voltage plate (4) is located in a cable fixing member (6); one end of a plurality of wiring terminals (2) is connected in parallel via a short-circuit wire, and an intermediate switch (17) is provided on the short-circuit wire; The cable fixing member (6) comprises a cable jack (61), the end of the cable jack (61) is in communication with the conductive plate active cavity (62), the side wall of the cable jack (61) is in communication with the cable fixing airbag placement cavity (63), an elastic diaphragm (7) is provided between the conductive plate active cavity (62) and the cable jack (61), and the elastic diaphragm (7) is connected to the conductive plate (4); a pipeline hole is provided at the end of the conductive plate active cavity (62), and the intermediate conductor (5) passes through the pipeline hole; The conductive plate active cavity (62) is connected to the air supply device (8) via a pipeline or an air passage, and a cable fixing air bag (9) is arranged in the cable fixing air bag placement cavity (63); The cable fixing member (6) is a plate-type structure, and includes a plurality of cable jacks (61) arranged side by side, each cable jack (61) corresponds to a conductive plate active cavity (62) and a cable fixing airbag placement cavity (63), the plurality of conductive plate active cavities (62) are all in communication with the air flow channel (10), the air flow channel (10) is in communication with the main air source pipe (11) through a plurality of branch pipes, and the main air source pipe (11) is connected to the air supply device (8); An arc-shaped groove (12) is provided in the air flow channel (10), a rotatable gas on-off knob (13) is provided in the arc-shaped groove (12), the gas on-off knob (13) comprises a rotating shaft column (13.2), a straight handle (13.3) is provided on the top of the rotating shaft column (13.2), an inverted L-shaped channel (13.1) is provided on the rotating shaft column (13.2), an air inlet of the inverted L-shaped channel (13.1) is connected to a branch pipe, and an air outlet of the inverted L-shaped channel (13.1) is provided on a side wall of the rotating shaft column (13.2); The air supply device (8) is an air pump. The air pump and the cable fixing member (6) are both arranged on the bottom plate (1). The air pump is connected to the main air source pipe (11) through an outlet pipe. A pressure sensor is provided on the outlet pipeline, and the pressure sensor is used to monitor the outlet pressure of the air pump; The cable fixing airbag (9) comprises a hard hollow shell (91), a strip-shaped airbag (92) is provided on the top surface of the hard hollow shell (91), and one end of the hard hollow shell (91) is open for communicating with the conductive plate active cavity (62); the cross section of the cable fixing airbag placement cavity (63) is in an inverted T shape.

2. The tool for facilitating detection of cable insulation according to claim 1, characterized in that: The conductive pressure plate (4) comprises an outer sheath (41) connected to the middle conductor (5), the outer sheath (41) being connected to a pressure plate (42), the pressure plate (42) being located in the cable jack (61), and the pressure plate (42) being used to contact the conductive wire core at the end face of the tested cable (16).

3. The tool for facilitating cable insulation detection according to claim 1, characterized in that: A control box (14) is provided on the bottom plate (1).

4. The tool for facilitating detection of cable insulation according to claim 1, characterized in that: The number of the wiring terminals (2) matches the number of the cable jacks (61), and after being connected in parallel, they are connected to the test lead connection column (15) via a short-circuit wire, and the insulation detection instrument (3) is a megohmmeter.

5. The method for using the tool for facilitating cable insulation detection according to any one of claims 1 to 4, characterized in that The following steps are involved: Inserting a tested cable (16) that needs insulation testing into a cable jack (61), without stripping the tested cable (16); the tested cable (16) may be one or more cables; When conducting insulation test to earth; Step 1, connecting two test leads of the insulation testing instrument (3) to the test lead connecting column (15) and the ground terminal respectively, wherein one end of a plurality of wiring terminals is connected in parallel and then connected to the test lead connecting column (15) via a short-circuit wire; Step 2: Turn the gas on / off knob (13) corresponding to the tested cable (16) to the on position; turn on the gas supply device (8); the elastic diaphragm (7) and the cable fixing airbag (9) expand and deform at the same time; the cable fixing airbag (9) is used to clamp the tested cable (16); the elastic diaphragm (7) pushes the conductive plate (4) to contact the conductive wire core at the end face of the tested cable (16); Step 3: Turn on the insulation tester (3) to perform insulation test; Step 4: After the insulation test is completed, the gas supply device (8) is turned off and the gas on / off knob (13) is reset; When conducting the phase-to-phase insulation test, connect the two test leads in step 1 to the two wiring terminals (2) respectively, and turn the middle switch (17) to the disconnected state, and repeat steps 2 to 4.

Images