A cable connection fitting crimping resistance detection device and method

Abstract

The invention discloses a cable connection fitting crimping resistance detection device, comprising a plurality of measuring fixtures, a processor, a power module, a voltage acquisition module and a current acquisition module; each measuring fixture comprises two semicircular outer sleeves, and the two semicircular outer sleeves can be closed or separated; the inner sides of the two semicircular outer sleeves are provided with current injection bayonet ports, the inner sides of the current injection bayonet ports are formed with semicircular notches, and when the two semicircular outer sleeves are closed, the two semicircular notches jointly form a through hole capable of accommodating cables and connection fittings; the semicircular outer sleeves are also provided with a plurality of wiring ports, and the wiring ports are used to connect the current injection bayonet ports with the power module through wiring; each semicircular outer sleeve is also fixedly provided with a plurality of sampling electrodes, the outer end of each sampling electrode is used to be connected with the voltage acquisition module, and the inner end points to the center direction of the semicircular outer sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of cable testing, and in particular to a method and a device for detecting crimping resistance of cable connection fittings. Background Art

[0002] At present, there is often a lack of quality control means and methods for the crimping resistance of cable joints in on-site construction environments, especially the crimping resistance of aluminum alloy cable joints, which leads to problems such as excessive crimping resistance of the joints causing heating and burning after a period of operation, and distorted electric fields leading to withstand voltage breakdown. Therefore, in order to strictly control the quality of on-site construction, it is necessary to design a set of devices and methods that can evaluate the crimping resistance of cable connection hardware. Summary of the invention

[0003] In order to solve the problems raised in the above background technology, the purpose of the present invention is to provide a method for detecting the crimping resistance of cable connection fittings.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A cable connection fitting crimping resistance detection device includes a plurality of measuring fixtures, a processor, a power supply module, a voltage acquisition module and a current acquisition module;

[0006] Each of the measuring fixtures comprises two semicircular outer sleeves, which can be closed or separated;

[0007] The inner sides of the two semicircular outer sleeves are both provided with current injection bayonet ports, the inner sides of the current injection bayonet ports are formed with semicircular notches, and when the two semicircular outer sleeves are closed, the two semicircular notches together form a through hole capable of accommodating cables and connecting hardware;

[0008] The semicircular outer sleeve is also provided with a plurality of wiring ports, and the wiring ports are used to connect the current injection port with the power module through wiring;

[0009] Each semicircular jacket is also fixedly provided with a plurality of sampling electrodes, the outer end of each sampling electrode is used to be connected to the voltage acquisition module, and the inner end points to the center direction of the semicircular jacket;

[0010] The voltage acquisition module and the current acquisition module are respectively used to acquire the required current and voltage information during detection, and the processor is at least used to calculate the crimping resistance of the cable connection fittings based on the acquired current and voltage information.

[0011] In some embodiments, the number of the measuring fixtures is four, namely a first fixture, a second fixture, a third fixture and a fourth fixture, and the four measuring fixtures have the same structure;

[0012] When testing the crimping resistance of the cable connection fitting, the first clamp and the second clamp are respectively arranged on the cables at both ends of the connection fitting;

[0013] The third clamp and the fourth clamp are arranged on another section of the cable, and the distance between the third clamp and the fourth clamp is the same as the distance between the first clamp and the second clamp;

[0014] Furthermore, one end of the power module is electrically connected to the first fixture, the third fixture is electrically connected to the fourth fixture, and the fourth fixture is electrically connected to the other end of the power module to form a loop;

[0015] The current acquisition module includes a current sensor, which is arranged in series in the loop;

[0016] The voltage acquisition module has multiple acquisition channels, wherein two poles of one acquisition channel are respectively connected to the sampling electrodes of the first fixture and the second fixture, and two poles of another acquisition channel are respectively connected to the sampling electrodes of the third fixture and the fourth fixture.

[0017] In some embodiments, one end of the two semicircular sleeves are rotatably connected by a hinge, and the other ends of the two semicircular sleeves are closed or separated by studs and corresponding nuts.

[0018] In some embodiments, each sampling electrode is mounted on the semicircular outer sleeve through an outer insulating sleeve, the insulating sleeve is fixed on the semicircular outer sleeve, and the sampling electrode can slide in the corresponding insulating sleeve.

[0019] In some embodiments, the power module includes a battery, a voltage-regulating and frequency-converting module, and a current amplifier; the battery is connected to the voltage-regulating and frequency-converting module, and the voltage-regulating and frequency-converting module is connected to the current amplifier.

[0020] In some embodiments, a temperature acquisition module and a display screen are also included. The temperature acquisition module is used to acquire the cable temperature, and the display screen is used to display relevant data during detection.

[0021] Another aspect of the present invention provides a method for detecting the crimping resistance of cable connection fittings, which uses the above-mentioned device for detecting the crimping resistance of cable connection fittings and comprises the following steps:

[0022] S1, according to the test requirements, install the four measuring fixtures, connecting hardware, cables, and complete the circuit connection;

[0023] S2, turning on the power module, collecting current signals through the current acquisition module, and collecting voltage signals between the first fixture and the second fixture and between the third fixture and the fourth fixture through two channels of the voltage acquisition module;

[0024] S3, respectively calculating the resistance R1 of the cable including the connecting fittings between the first clamp and the second clamp, and the resistance R2 of the cable between the third clamp and the fourth clamp;

[0025] S4, K=R1 / R2, the K value is used to judge the quality of the crimping resistance of the connecting hardware.

[0026] In some embodiments, after step S4, the method further includes the following steps:

[0027] S5, changing the output frequency of the power module, calculating the AC resistance value of the skin effect depth at different frequencies to obtain the distribution status of different layers of conductor resistance.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The cable connection fitting crimping resistance detection device and method provided by the present invention can conveniently realize the detection of the cable connection fitting crimping resistance, avoiding problems such as heat burning and voltage breakdown caused by excessive crimping resistance; it has a simple structure, low cost, mature technology, wide adaptability, and great practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A circuit schematic diagram of the cable connection fitting crimping resistance detection device provided by the present invention when in use;

[0031] Figure 2 is a schematic diagram of the measuring fixture;

[0032] Figure 3 A schematic diagram of module connection of a device for detecting crimping resistance of cable connection fittings provided by the present invention.

[0033] Description of reference numerals:

[0034] 1. Processor; 2. Power module; 3. Voltage regulation and frequency conversion module; 4. Battery; 5. Voltage acquisition module; 6. Current acquisition module; 7. Temperature acquisition module; 8. Display screen; 9. Current amplifier; 10. First fixture; 11. Second fixture; 12. Third fixture; 13. Fourth fixture; 14. Current sensor; 15. Connecting hardware; 16. Cable; 17. Hinge; 18. Current injection bayonet; 19. Sampling electrode; 20. Stud; 21. Wiring port; 22. Semicircular jacket. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following further describes how the present invention is implemented in conjunction with the accompanying drawings and specific implementation methods.

[0036] Reference Figure 1 and Figure 2As shown, the present invention provides a cable connection fitting crimping resistance detection device, including a plurality of measuring fixtures, a processor 1, a power module 2, a voltage acquisition module 5 and a current acquisition module 6; each measuring fixture includes two semicircular outer sleeves 22, and the two semicircular outer sleeves 22 can be closed or separated; the inner sides of the two semicircular outer sleeves 22 are provided with current injection bayonet 18, and the inner sides of the current injection bayonet 18 are formed with a semicircular notch, and when the two semicircular outer sleeves 22 are closed, the two semicircular notches together form a space capable of accommodating the cable 16 and the connection fitting 15. Through hole; the semicircular jacket 22 is also provided with a plurality of wiring ports 21, which are used to connect the current injection bayonet 18 to the power module 2 through wiring; each semicircular jacket 22 is also fixedly provided with a plurality of sampling electrodes 19, the outer end of each sampling electrode 19 is used to connect to the voltage acquisition module 5, and the inner end points to the center direction of the semicircular jacket 22; the voltage acquisition module 5 and the current acquisition module 6 are respectively used to collect the required current and voltage information during detection, and the processor 1 is at least used to calculate the crimping resistance of the cable connection hardware according to the collected current and voltage information.

[0037] Preferably, there are four measuring fixtures, namely, a first fixture 10, a second fixture 11, a third fixture 12 and a fourth fixture 13, and the four measuring fixtures have the same structure; when performing crimping resistance detection of cable connection fittings, the first fixture 10 and the second fixture 11 are respectively arranged on the cable 16 at both ends of the connection fitting 15; the third fixture 12 and the fourth fixture 13 are arranged on another section of the cable 16, and the distance between the third fixture 12 and the fourth fixture 13 is the same as the distance between the first fixture 10 and the second fixture 11; and the power supply One end of the module 2 is electrically connected to the first clamp 10, the third clamp 12 is electrically connected to the fourth clamp 13, and the fourth clamp 13 is electrically connected to the other end of the power module 2 to form a loop; the current acquisition module 6 includes a current sensor 14, and the current sensor 14 is arranged in series in the loop; the voltage acquisition module 5 has multiple acquisition channels, and the two poles of one acquisition channel are respectively connected to the sampling electrodes 19 of the first clamp 10 and the second clamp 11, and the two poles of another acquisition channel are respectively connected to the sampling electrodes 19 of the third clamp 12 and the fourth clamp 13.

[0038] Understandably, Figure 1 The two sections of cable 16 shown in the figure may be two different parts of the same cable 16, or may be two different cables of the same specification.

[0039] Preferably, one end of the two semicircular outer sleeves 22 is rotatably connected via a hinge 17, and the other end of the two semicircular outer sleeves 22 is closed or separated via a stud 20 and a corresponding nut.

[0040] Preferably, each sampling electrode 19 is mounted on the semicircular outer sleeve 22 through an outer insulating sleeve, the insulating sleeve is fixed on the semicircular outer sleeve 22, and the sampling electrode 19 can slide in the corresponding insulating sleeve.

[0041] In a specific embodiment, the thickness of the current injection port 18 can be 2 mm, and the current injection port 18 and the semicircular housing 22 are processed from a single copper block.

[0042] Preferably, the power module 2 includes a battery 4, a voltage-regulating and frequency-converting module 3, and a current amplifier 9; the battery 4 is connected to the voltage-regulating and frequency-converting module 3, and the voltage-regulating and frequency-converting module 3 is connected to the current amplifier 9. The battery 4 can be a high-density explosion-proof battery, and the battery 4 is used for power supply without relying on the mains, which can adapt to the use environment of outdoor sites.

[0043] Preferably, the cable connection fitting crimping resistance detection device further comprises a temperature acquisition module 7 and a display screen 8, wherein the temperature acquisition module 7 is used to acquire the temperature of the cable 16, and the display screen 8 is used to display relevant data during detection.

[0044] Reference Figure 3 As shown, the voltage acquisition module 5, the current acquisition module 6, the temperature acquisition module 7, the display screen 8, the battery 4 of the power module 2, the voltage regulation and frequency conversion module 3 and the current amplifier 9 can be connected to the processor 1 respectively, and the processor 1 controls the operation of each module.

[0045] In a specific embodiment, the processor 1 can use a high-speed ARM processor with a built-in floating-point processor unit FPU; the voltage regulation and frequency conversion module 3 can output a 0~1kHz sinusoidal wave signal with a power of 500W; the voltage acquisition module 5 and the current acquisition module 6 both have a synchronous acquisition function, and the acquisition is performed through the control command of the processor 1.

[0046] Another aspect of the present invention provides a method for detecting crimping resistance of cable connection fittings, using the above-mentioned device for detecting crimping resistance of cable connection fittings, and comprising the following steps:

[0047] S1, according to the detection needs, install the four measuring fixtures, the connecting hardware 15, and the cable 16, and complete the circuit connection. In addition, when installing the measuring fixture, the stud 20 is locked with the corresponding nut, and the torque of the nut can be measured with a torque wrench, so that the nut torque of the four measuring fixtures is the same value, thereby reducing the error.

[0048] S2, turn on the power module 2, collect current signals through the current acquisition module 6, and collect voltage signals between the first clamp 10 and the second clamp 11 and between the third clamp 12 and the fourth clamp 13 through two channels of the voltage acquisition module 5.

[0049] S3 , respectively calculating the resistance R1 of the cable 16 including the connecting fitting 15 between the first fixture 10 and the second fixture 11 , and the resistance R2 of the cable 16 between the third fixture 12 and the fourth fixture 13 .

[0050] S4, K = R1 / R2, the quality of the crimping resistor of the connection fitting 15 is judged by the K value. Generally speaking, the K value should be less than 1.2.

[0051] Preferably, after step S4, the method further comprises the following steps:

[0052] S5, changing the output frequency of the power module 2, calculating the AC resistance values ​​of the skin effect depths at different frequencies, so as to obtain the distribution status of the conductor resistance at different layers.

[0053] It can be understood that when the power module 2 is working, the current can be processed by the voltage-regulating and frequency-converting module 3 and the current amplifier 9 before being applied to the measurement circuit. The output frequency and power of the power module 2 are adjustable; and changing the power frequency can change the skin depth, and the layered resistance value can be calculated by converting the equivalent resistance values ​​of different diameters at different depths. Therefore, the detection method proposed by the present invention can directly calculate whether the joint crimping resistance is within the qualified range, and indirectly calculate the equivalent layered resistance value by changing the test frequency.

[0054] In summary, the cable connection fittings crimping resistance detection device and method provided by the present invention can conveniently realize the detection of the cable connection fittings crimping resistance, avoiding problems such as heat burning and voltage breakdown caused by excessive crimping resistance; it has a simple structure, low cost, mature technology, wide adaptability, and great practical value.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A cable connection fitting crimping resistance detection device, characterized in that: It comprises a plurality of measuring fixtures, a processor (1), a power supply module (2), a voltage acquisition module (5) and a current acquisition module (6); Each of the measuring fixtures comprises two semicircular outer sleeves (22), and the two semicircular outer sleeves (22) can be closed or separated; The inner sides of the two semicircular outer sleeves (22) are both provided with current injection bayonet (18), the inner sides of the current injection bayonet (18) are formed with a semicircular notch, and when the two semicircular outer sleeves (22) are closed, the two semicircular notches together form a through hole capable of accommodating the cable (16) and the connection fitting (15); The semicircular outer sleeve (22) is also provided with a plurality of wiring ports (21), and the wiring ports (21) are used to connect the current injection port (18) to the power module (2) through wiring; Each semicircular outer jacket (22) is also fixedly provided with a plurality of sampling electrodes (19), the outer end of each sampling electrode (19) being used to be connected to the voltage acquisition module (5), and the inner end pointing to the center direction of the semicircular outer jacket (22); The voltage acquisition module (5) and the current acquisition module (6) are respectively used to acquire required current and voltage information during detection, and the processor (1) is at least used to calculate the crimping resistance of the cable connection fittings based on the acquired current and voltage information; Each sampling electrode (19) is mounted on the semicircular outer sleeve (22) through an outer insulating sleeve, the insulating sleeve is fixed on the semicircular outer sleeve (22), and the sampling electrode (19) can slide in the corresponding insulating sleeve; The power module (2) comprises a battery (4), a voltage-regulating and frequency-converting module (3) and a current amplifier (9); the battery (4) is connected to the voltage-regulating and frequency-converting module (3), and the voltage-regulating and frequency-converting module (3) is connected to the current amplifier (9); By changing the output frequency of the power module (2) and calculating the AC resistance values ​​of the skin effect depths at different frequencies, the distribution conditions of the conductor resistance at different layers can be obtained.

2. The cable connection fitting crimping resistance detection device according to claim 1, characterized in that: There are four measuring fixtures, namely a first fixture (10), a second fixture (11), a third fixture (12) and a fourth fixture (13), and the four measuring fixtures have the same structure; When testing the crimping resistance of the cable connection fitting, the first clamp (10) and the second clamp (11) are respectively arranged on the cable (16) at both ends of the connection fitting (15); The third clamp (12) and the fourth clamp (13) are arranged on another section of cable (16), and the distance between the third clamp (12) and the fourth clamp (13) is the same as the distance between the first clamp (10) and the second clamp (11); Furthermore, one end of the power module (2) is electrically connected to the first clamp (10), the third clamp (12) is electrically connected to the fourth clamp (13), and the fourth clamp (13) is electrically connected to the other end of the power module (2), thereby forming a loop; The current acquisition module (6) comprises a current sensor (14), and the current sensor (14) is arranged in series in a loop; The voltage acquisition module (5) has a plurality of acquisition channels, wherein two poles of one acquisition channel are respectively connected to sampling electrodes (19) of a first clamp (10) and a second clamp (11), and two poles of another acquisition channel are respectively connected to sampling electrodes (19) of a third clamp (12) and a fourth clamp (13).

3. The cable connection fitting crimping resistance detection device according to claim 1, characterized in that: One end of the two semicircular outer sleeves (22) is rotatably connected via a hinge (17), and the other end of the two semicircular outer sleeves (22) is closed or separated via a stud (20) and a corresponding nut.

4. The cable connection fitting crimping resistance detection device according to claim 1, characterized in that: It also comprises a temperature acquisition module (7) and a display screen (8), wherein the temperature acquisition module (7) is used to acquire the temperature of the cable (16), and the display screen (8) is used to display relevant data during detection.

5. A method for detecting crimping resistance of cable connection fittings, characterized in that: The cable connection fitting crimping resistance detection device according to any one of claims 2 to 4 is used, and comprises the following steps: S1, according to the detection requirements, four measuring fixtures, connecting hardware (15), and cables (16) are installed, and the circuit connection is completed; S2, turning on the power module (2), collecting current signals through the current collection module (6), and collecting voltage signals between the first clamp (10) and the second clamp (11) and voltage signals between the third clamp (12) and the fourth clamp (13) through two channels of the voltage collection module (5); S3, respectively calculating the resistance R1 of the cable (16) including the connecting fitting (15) between the first clamp (10) and the second clamp (11), and the resistance R2 of the cable (16) between the third clamp (12) and the fourth clamp (13); S4, K = R1 / R2, the K value is used to judge the quality of the crimping resistance of the connection fitting (15); S5, changing the output frequency of the power module (2), calculating the AC resistance values ​​of the skin effect depths at different frequencies, so as to obtain the distribution status of the conductor resistance at different layers.

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