Auxiliary clamp for parameter detection of overhead insulated cable

Abstract

The utility model discloses an auxiliary clamp for parameter detection of an overhead insulated cable, which comprises a clamp for detecting a detected cable, the clamp comprises a clamping block, measuring needle assemblies and a contact judgment module, the two ends of the clamping block are respectively connected with the measuring needle assemblies, the contact judgment module is arranged in the clamping block, and the contact judgment module is connected with the measuring needle assemblies. A clamping hole is formed in the clamping block in a penetrating mode and comprises a first arc and a second arc, the diameter of the second arc is larger than that of the first arc, and the two ends of the first arc and the two ends of the second arc are connected through diagonal planes respectively. According to the utility model, the clamp is simple to operate, a cable sealing head does not need to be removed, a cable insulating layer does not need to be stripped, the two measuring heads of the clamp can be quickly contacted with an aerial cable conductor, and whether the two measuring heads are in good contact with the conductor can be conveniently and quickly judged; and after the detection is completed, the sealing heads at the two ends of the cable do not need to be additionally sealed, so that the preparatory work before the detection and the work after the detection are greatly simplified.

Description

Technical Field

[0001] The utility model relates to an auxiliary fixture, in particular to an auxiliary fixture for detecting parameters of overhead insulated cables. Background Art

[0002] With the rapid development of the national economic construction, the demand for electric power energy has gradually increased. In the electric power energy construction project, the overhead insulated cable has the characteristics of high power supply reliability, good power supply safety, convenient erection and maintenance, high economic rationality, etc. The usage amount of the overhead insulated cable increases year by year, and the demand is huge. The technical parameter detection work of the overhead insulated cable supplied in coils by the manufacturer is also gradually increasing. Therefore, higher requirements are put forward for the use convenience of the detection equipment auxiliary fixture.

[0003] When detecting the parameters of the overhead insulated cable, auxiliary fixtures are required at both ends of the cable, and the fixture is required to meet the Kelvin four-wire system. Although the existing supporting auxiliary fixtures and usage methods of the detection equipment can cooperate to complete the detection work, there are obvious deficiencies such as cumbersome usage steps, inconvenient enough, low detection work efficiency, and high labor cost consumption. The main manifestations are as follows: Before using the existing fixture, it is necessary to first use a tool to strip the sealing heads at both ends of the overhead insulated cable, and then strip the insulating layers at both ends of the cable to expose the conductors, and then clamp the fixture on the conductors for detection. The steps are cumbersome and the preparatory work before detection is large; After the detection work is completed, it is necessary to restore the sealing heads at both ends of the cable, increasing the additional workload; After the fixture is clamped, it is impossible to judge the contact situation between the clip and the cable conductor; Limited by the size of its tiger's mouth, the existing fixture is not easy to clamp the overhead insulated cable with a larger diameter. Summary of the Utility Model

[0004] Utility Model Objective: The objective of the utility model is to propose an auxiliary fixture for detecting parameters of overhead insulated cables. The fixture is simple to operate, does not need to remove the cable sealing head, does not need to strip the cable insulating layer, and can quickly make the two measuring heads of the fixture contact the overhead cable conductor to complete the detection.

[0005] Technical Solution: The utility model includes a fixture for detecting a cable to be measured. The fixture includes a clamping block, a measuring needle assembly and a contact judgment module. The measuring needle assemblies are respectively connected to both ends of the clamping block, and the contact judgment module is installed in the clamping block. The clamping block is provided with a clamping hole through it. The clamping hole includes a first arc and a second arc. The diameter of the second arc is larger than that of the first arc. The two ends of the first arc and the second arc are respectively connected by an inclined plane.

[0006] The inclined planes are respectively tangent to the first arc and the second arc. The first arc and the second arc are connected by the inclined planes to form a clamping hole. The shape and size of the clamping hole are determined according to the specifications of conventional overhead cables, ensuring that overhead insulated cables of various specifications can penetrate into the clamping hole.

[0007] The measurement needle assembly is installed on the side of the clamping block through the inlay block.

[0008] The measurement needle assembly includes a rod. One end of the rod is provided with a knob, and the other end is processed into a spiked shape. The rod is provided with threads. The measurement needle is processed into a spiked shape and can easily pierce through the cable insulation layer to contact the cable conductor, eliminating the need for extra preparatory work before detection and aftercare work after detection, and greatly improving work efficiency.

[0009] The knob is provided with a detection line socket for connecting the clamp to the detection instrument.

[0010] The clamping block is provided with a contact judgment module embedding hole, and the contact judgment module is installed in the clamping block through the contact judgment module embedding hole.

[0011] A panel is installed on the front end face of the clamping block.

[0012] The contact judgment module is provided with a contact judgment button, and the contact judgment button is installed on the panel.

[0013] Fixtures are respectively clamped at both ends of the cable to be measured, and the fixtures are connected to the detection instrument.

[0014] Working principle: Turn the measurement needle assemblies on both sides of the clamping block to the outermost side respectively. Insert the end of the cable to be measured into the special-shaped clamping hole. First, screw the measurement needle assembly on the side of the second arc and stop when the tip of the measurement needle assembly pierces through the cable insulation layer and obvious resistance is felt; then screw the measurement needle assembly on the other side and stop when obvious resistance is felt; press the contact judgment button. If the red light is on, it means that both measurement needles have made good contact with the cable conductor; if the light is not on, continue to screw the measurement needles on both sides until the light on it can light up when the contact judgment button is pressed; after the detection operation is completed, remove the fixture, and the small hole formed in the cable insulation layer during the detection process will rebound and fill.

[0015] Beneficial effects: The present utility model has the following advantages:

[0016] (1) The fixture is easy to operate. There is no need to remove the cable sealing head or strip the cable insulation layer. It can quickly make the two measurement heads of the fixture contact the overhead cable conductor, and can conveniently and quickly judge whether the two measurement heads are in good contact with the conductor; after the detection is completed, there is no need to perform additional sealing treatment on the sealing heads at both ends of the cable, greatly simplifying the preparatory work before detection and the aftercare work after detection, reducing manual consumption, and having good application value and popularization value;

[0017] (2) Through the special-shaped clamping hole, in cooperation with two measurement needles of different lengths and the inclined surface on the clamping hole, multi-point support clamping is formed on the cable, which is firm and reliable;

[0018] (3) The measuring needle is processed into a spiked shape, which can easily pierce through the cable insulation layer and contact the cable conductor, eliminating the need for redundant preparatory work before detection and aftercare work after detection, thus greatly improving work efficiency.

[0019] (4) The contact judgment module, in cooperation with the judgment button with a light, can visually judge whether the two measuring needles have made good contact with the cable conductor.

[0020] (5) The special-shaped clamping hole can clamp most specifications of overhead insulated cables, achieving multi-purpose clamping. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the usage scenario of the fixture of the present utility model;

[0022] Figure 2 It is a three-dimensional structure schematic diagram of the fixture of the present utility model;

[0023] Figure 3 It is the front view of the fixture of the present utility model;

[0024] Figure 4 It is a three-dimensional structure schematic diagram of the clamping block of the present utility model. Detailed Embodiment

[0025] The present utility model will be further described below with reference to the drawings.

[0026] As Figures 1 to 4 shown, the auxiliary fixture for detecting the parameters of the overhead insulated cable of the present utility model includes a fixture 1 and a cable to be measured 2. The two ends of the cable to be measured 2 are respectively clamped with a fixture 1. The fixture 1 needs to meet the Kelvin four-wire system. The fixture 1 is connected to the detection instrument, as Figure 1 shown.

[0027] As Figure 2 and Figure 3 shown, the fixture 1 includes a clamping block 11, a measuring needle assembly, an inlay block 13, a panel 14, and a contact judgment button 16. The clamping block 11 is provided with a special-shaped clamping hole 111 that runs through from front to back. As Figure 4 shown, the special-shaped clamping hole 111 includes a first arc and a second arc. The diameter of the second arc is greater than that of the first arc. The two ends of the first arc and the second arc are respectively connected together through inclined planes. The inclined planes are respectively tangent to the first arc and the second arc. The first arc and the second arc are connected through the inclined planes to form the special-shaped clamping hole 111 for clamping the cable to be measured 2. The shape and size of the special-shaped clamping hole are determined according to the specifications of conventional overhead cables, ensuring that various specifications of overhead insulated cables can penetrate into the special-shaped clamping hole.

[0028] In this embodiment, through a large number of explorations and tests, the special-shaped clamping hole 111 is designed as Figure 3The shape shown. The diameter of the arc at one end is 10 mm, and the diameter of the arc at the other end is 40 mm. Thus, an overhead insulated cable with an outer diameter less than 40 mm can be inserted into the special-shaped clamping hole for clamping and detection operations. This clamping range covers most specifications of overhead insulated cables, fully meeting the needs of on-site detection work and realizing multi-purpose clamping.

[0029] The clamping block 11 uses a non-metallic clamping block. A panel 14 is installed on the front end face of the non-metallic clamping block. A contact judgment module embedding hole 112 is provided in the clamping block 11. The contact judgment module is installed in the clamping block 11 through the contact judgment module embedding hole 112. A contact judgment button 16 is provided on the contact judgment module, and the contact judgment button 16 is installed on the panel 14. When the measuring needle assemblies on both sides come into contact with the cable conductor, a circuit is formed with the contact judgment module. At this time, press the contact judgment button 16, and the red light will light up, indicating that the measuring needles on both sides have made good contact with the cable conductor. The electrical energy for the light to turn on comes from the pre-buried contact judgment module. When the contact judgment button 16 is released, the circuit of the contact judgment module is disconnected, so the measuring current of the measuring instrument will not flow through the contact judgment module.

[0030] Measuring needle assemblies are respectively installed on the left and right sides of the clamping block 11. The lengths of the measuring needle assemblies can be the same or different. To save installation space, the measuring needle assemblies in this embodiment adopt a long measuring needle assembly 12 and a short measuring needle assembly 15. The long measuring needle assembly 12 and the short measuring needle assembly 15 are respectively installed on both sides of the clamping block 11 through the inlay block 13. The measuring needle assembly includes a rod. One end of the rod is provided with a knob, and the other end is processed into a spiked shape, which can pierce the cable insulation layer and contact the cable metal conductor. Without removing the cable sealing head and without stripping the cable insulation layer, the two measuring heads of the fixture can quickly contact the overhead cable conductor to complete the detection. After the detection is completed, there is no need to perform additional sealing treatment on the sealing heads at both ends of the cable. A thread is provided on the rod, and it is assembled and connected to the inlay block 13 through the thread, and then screwed into the side of the clamping block 11. By screwing this thread, the extension and retraction of the measuring needle can be realized. A detection line insertion hole is provided on the knob for connecting the fixture 1 to the detection instrument. The two measuring needle assemblies with one long and one short cooperate with the special-shaped clamping hole 111 to form multi-point clamping of the cable, which is firm and reliable.

[0031] The inlay block 13 in this embodiment uses a metal inlay block to improve wear resistance.

[0032] The detection method of the auxiliary fixture for detecting the parameters of the overhead insulated cable of the present utility model includes the following steps:

[0033] Turn the measuring needle assemblies on both sides of the clamping block to the outermost side respectively to leave enough space for threading the cable. Insert the end of the cable to be measured into the special-shaped clamping hole. First, turn the measuring needle assembly on the side of the second arc. When the tip of the measuring needle touches the insulating outer skin of the cable, at this time, the tip of the measuring needle, support point A, and support point B form a three-point support for the cable, achieving reliable clamping.

[0034] Continue to turn the measuring needle assembly on this side until the tip pierces the cable insulation layer and stop when obvious resistance is felt.

[0035] Turn the measuring needle assembly on the other side and stop when obvious resistance is felt.

[0036] Press the contact judgment button. If the red light is on, it means that the measuring needles on both sides have made good contact with the cable conductor. If the light is not on, continue to turn the measuring needles on both sides until the light on it can be turned on when the contact judgment button is pressed. The electrical energy required for the light to turn on comes from the lithium battery in the pre-buried contact judgment module. During the detection process of the cable parameters by the detection instrument, the contact judgment button is in the released state, and the contact judgment circuit is in the open state. The detection current will not flow through the contact judgment module and will not cause any impact on the detection results.

[0037] After the detection operation is completed, remove the fixture. Since the cable insulation layer is a flexible plastic with a certain resilience, the small hole formed during the detection process will rebound and fill, so there is no need for additional treatment of the cable end sealing after the detection operation is completed.

Claims

1. An auxiliary fixture for detecting parameters of overhead insulated cables, characterized in that: The invention comprises a clamp for detecting the tested cable, wherein the clamp comprises a clamping block, a measuring needle assembly and a contact judgment module, wherein the two ends of the clamping block are respectively connected with the measuring needle assemblies, the contact judgment module is installed in the clamping block, the clamping block is penetrated with a clamping hole, the clamping hole comprises a first circular arc and a second circular arc, the diameter of the second circular arc is larger than the diameter of the first circular arc, and the two ends of the first circular arc and the second circular arc are respectively connected by beveled surfaces.

2. The auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 1, characterized in that: The chamfered surface is tangent to the first circular arc and the second circular arc respectively, and the first circular arc and the second circular arc are connected by the chamfered surface to form a clamping hole.

3. The auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 1, characterized in that: The measuring needle assembly is mounted on the side of the clamping block through the inlay block.

4. An auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 1 or 3, characterized in that: The measuring needle assembly comprises a rod, one end of which is provided with a knob, and the other end of which is processed into a spike shape, and the rod is provided with a thread.

5. The auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 4, characterized in that: The knob is provided with a detection line plug-in hole.

6. The auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 1, characterized in that: The clamping block is provided with a contact judgment module embedding hole, and the contact judgment module is installed in the clamping block through the contact judgment module embedding hole.

7. The auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 6, characterized in that: A panel is installed on the front end surface of the clamping block.

8. The auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 7, characterized in that: The contact judgment module is provided with a contact judgment button, and the contact judgment button is installed on the panel.

9. The auxiliary fixture for detecting parameters of an overhead insulated cable according to claim 1, characterized in that: The two ends of the tested cable are respectively clamped with clamps, and the clamps are connected to the testing instrument.

Images