CN210802381U - Cable conductor comprehensive tester - Google Patents
Cable conductor comprehensive tester Download PDFInfo
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- CN210802381U CN210802381U CN201921899557.8U CN201921899557U CN210802381U CN 210802381 U CN210802381 U CN 210802381U CN 201921899557 U CN201921899557 U CN 201921899557U CN 210802381 U CN210802381 U CN 210802381U
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Abstract
The utility model belongs to the technical field of cable detection, a cable conductor comprehensive tester is disclosed, which adopts an imaging method and comprehensive diagnosis of multiple electrical parameters to measure the effective sectional area of a cable conductor, the direct current resistance of a long conductor, the direct current resistance of a conductor with unit length, the capacitance of the long cable, the capacitance of the cable with unit length, the environmental temperature and other parameters; the method is characterized in that the effective sectional area of the end face of the cable is accurately measured by acquiring an image of the end face of the cable, the measurement precision is greatly improved compared with the traditional method for measuring the diameter of the cable by using a caliper, and the shape and the type of the cable to be measured are not limited; measuring the direct current resistance of the cable through a resistance measuring module, calculating the resistance in unit length through the nominal length, and comparing the resistance value of the long conductor with the intercepted resistance value of the reference conductor to calculate the actual length of the cable conductor; and measuring the capacitance of the cable through a capacitance measuring module, and calculating the actual length of the cable through the capacitance of the cable and the capacitance of the intercepted reference cable.
Description
Technical Field
The utility model belongs to the technical field of the cable detects, more specifically relates to a cable conductor integrated tester.
Background
The investment of cable quality and quantity guarantee engineering has great significance on power supply safety. If unqualified cables are used for circuits such as lighting, air conditioning and the like in various buildings and railway engineering, huge potential safety hazards can be buried for the engineering. At present, the market scale of the cable industry reaches trillion level, but the quality of cable products is not optimistic, for example, the cable core wires of part of the cable products are shrunk and thinned to enable the cable core wires to be thick at two ends and thin in the middle, the thickness of a rubber layer is thick, the core wires are thin to enable the conductor sectional area of the cable to be reduced, the conductor proportion of the alloy cable does not reach the standard, the conductor density is not uniform, the cable length is smaller than the nameplate length, and the like. The existing method for calculating the resistance value of unit length by measuring the direct current resistance of a cable conductor to further calculate the length of the cable or the method for reversely calculating the cross section area of the conductor by adopting the direct current resistance has small damage to the cable, but the defective products with the proportional change of the length and the cross section area of the cable are easy to miss detection.
In the traditional method for measuring the diameter of the conductor and calculating the sectional area by using a caliper, the error is large due to the reasons that the cable conductor is irregular and round, gaps exist when multiple strands are twisted and the like; the prior art technique for detecting twisted pair cables, such as disclosed in patent application No. CN200910261930, is to generate relative motion between a cable including a plurality of wires and a magnetic field, detect an electrical signal induced in the wires in response to the magnetic field, sense a change in the electrical signal due to the relative motion, and detect a defect in the cable from the change; the detection method is more focused on the detection of the breakage or splicing of the core wires in the cable, and the uniformity of the sectional area of the core wires of the cable cannot be detected. An accurate nondestructive testing device is urgently needed to meet the testing requirement of an engineering field on a cable conductor.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a cable conductor comprehensive tester, its aim at detects, the compliance judges for cable conductor parameter provides accurate detection means.
In order to realize the purpose of the utility model, according to one aspect of the utility model, a cable conductor comprehensive tester is provided, which comprises a main control unit, an imaging module interface and a power supply interface;
the imaging module is communicated with the main control unit through an imaging module interface and is used for drawing the cross section of the cable conductor to be detected, the main control unit calculates the cross section of the cable conductor according to the obtained image and obtains the length of the cable conductor according to the cross section; the power supply interface is used for being connected with an external power supply to supply power for other units or modules.
Preferably, the cable conductor comprehensive tester further comprises a capacitance measuring module and a capacitance testing interface;
one side of the capacitance test interface is connected with the capacitance measurement module, and the other side of the capacitance test interface is used as an external interface of the cable conductor comprehensive tester and is used for accessing a tested piece to carry out capacitance measurement; the capacitance test module and the main control unit have a connection relation for signal interaction.
Preferably, the cable conductor comprehensive tester further comprises a resistance measuring module and a resistance testing interface;
one side of the resistance test interface is connected with the resistance measurement module, and the other side of the resistance test interface is used as the other external interface of the cable conductor comprehensive tester and is used for accessing a tested piece to carry out resistance measurement; the resistance testing module is also connected with the main control unit for signal interaction.
Preferably, the imaging module of the cable conductor comprehensive tester comprises an optical imaging system and an imaging clamp; the optical imaging system is used for collecting the image of the section of the tested cable, and one or more groups of imaging clamps arranged on the lens barrel of the optical imaging system are used for fixing the tested piece, so that the central axis of the tested piece is parallel to the optical axis of the lens of the optical imaging system.
Preferably, the imaging module of the comprehensive tester for cable conductors further comprises a distance baffle, and the distance baffle is attached to the cross section of the tested cable, so that the distance between the tested piece and the lens of the optical imaging system is fixed to obtain a high-resolution image.
Preferably, the imaging module of the cable conductor comprehensive tester further comprises a diffuse light plate and a light source; the diffusion plate and the light source are arranged on one side, away from the measured piece, of the lens of the optical imaging system and used for providing a uniform illumination light source for the measured piece, and therefore clear and high-resolution images are obtained.
Preferably, the cable conductor comprehensive tester further comprises a human-computer interaction unit which is connected with the main control module in a signal interaction manner; the main control unit sends the interface image of the tested piece collected by the imaging module to the man-machine interaction unit for displaying; the man-machine interaction unit is also used for receiving the input detection parameters and sending the detection parameters to the main control unit, and is used for displaying the sectional area of the cable conductor and the length of the cable conductor which are obtained by the main control unit through calculation.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
the utility model provides a cable conductor comprehensive tester, adopt through getting for instance the sectional area of cable conductor, calculate and obtain the effective sectional area of cable conductor according to the image that gets for instance the result; the resistance and the capacitance of the cable are obtained by measuring through a parallel capacitance measuring module and a resistance measuring module; the main control unit further obtains parameters required by parameter detection and compliance judgment of a plurality of groups of cable conductors such as the direct current resistance of the conductor in unit length of the cable, the cable capacitance in unit length and the like through calculation according to a preset algorithm and the measured resistance and capacitance; compared with the traditional method of measuring the diameter of the cable by using a caliper, the method for obtaining the sectional area of the cable conductor through imaging greatly improves the accuracy and precision of measuring the sectional area of the cable conductor, and has no limit on the shape and type of the measured cable; on the other hand, the comprehensive tester integrates multi-parameter detection means, one device can meet the requirement of multi-parameter detection of the cable on the engineering site, and the actual measurement result shows that the comprehensive tester for the cable conductor greatly improves the measurement precision of the capacitance, the resistance and the length of the cable conductor.
Drawings
Fig. 1 is a schematic diagram of the cable conductor comprehensive tester provided by the utility model.
Fig. 2 is a schematic diagram of an imaging module according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The utility model provides a cable conductor integrated test appearance adopts the comprehensive diagnosis of imaging method and many electrical parameters, measures cable conductor effective cross-sectional area, long conductor direct current resistance, unit length conductor direct current resistance, long cable electric capacity, unit length cable electric capacity and ambient temperature isoparametric. The sectional area test specifically realizes the accurate measurement of the effective sectional area of the cable end face by acquiring the image of the cable cross section. The method for obtaining the effective sectional area of the cable end face through the image processing and the operation of the cable end face has a plurality of methods, in the utility model, the processing and the operation are carried out according to the algorithm which is arranged in the main control unit; in a specific embodiment, the algorithm Is based on the difference between the imaging gray scales of the cable conductor material and the cable cladding layer, the number I of pixel points occupied by the gray scales of the cable conductor Is calculated, the actual area S of a single pixel point of an image of the cable cross section Is calculated according to the imaging parameters of the image of the cable cross section, and therefore the measured value S of the total cross section area of the cable conductor Is obtained.
Compared with the traditional method for measuring the diameter of the cable by using a caliper, the method for obtaining the measured value of the sectional area of the cable conductor by imaging the sectional area of the cable conductor avoids the measurement error caused by the existence of gaps when the core wire of the cable conductor is in an irregular round shape and stranded, greatly improves the measurement precision of the sectional area, and has no limit on the shape and the type of the measured cable.
The utility model provides a cable conductor comprehensive tester measures the direct current resistance of being surveyed the cable through accurate resistance measurement module, and then adopts the algorithm of presetting to calculate the measured value that the unit length resistance, the resistance through long conductor and the resistance comparison of the reference conductor of intercepting calculated the cable conductor length according to nominal length through host system. Similarly, the capacitance of the cable to be measured is measured by the precise capacitance measuring module, and then the main control module calculates the measured value of the conductor length of the cable by comparing the capacitance of the long cable with the intercepted capacitance of the reference cable by adopting a preset algorithm.
Referring to fig. 1, an embodiment of the comprehensive tester for cable conductors includes a resistance measurement module, a capacitance measurement module, a main control unit, an imaging module interface, a resistance test interface, a capacitance test interface, and a power supply interface;
one side of the capacitance test interface is used as an external interface of the comprehensive tester and used for accessing a tested piece to carry out capacitance measurement, and the other side of the capacitance test interface is connected with the capacitance measurement module; one side of the resistance test interface is used as the other external interface of the comprehensive tester and is used for accessing a tested piece to carry out resistance measurement, and the other side of the resistance test interface is connected with the resistance measurement module; the capacitance testing module and the resistance testing module are electrically connected with the main control unit; the imaging module is communicated with the main control unit through an imaging module interface and is used for drawing the cross section of the conductor of the tested cable, the main control unit calculates the cross section of the conductor of the cable according to the obtained image and obtains the length of the conductor of the cable according to the cross section; the power supply interface is used for being connected with an external power supply to supply power for other units or modules.
Referring to fig. 2, an imaging module in an embodiment includes an optical imaging system, an imaging jig, a distance plate, a diffuser plate, and an LED lamp as a light source; the optical imaging system lens module is KS10a411, and the specific parameters are as shown in table 1 below. The inner diameter of the lens cone is 35mm, the length of the lens cone is 60mm, two groups of imaging clamps arranged on the lens cone are used for fixing a measured piece to enable the central axis of the measured piece to be parallel to the optical axis of the lens, one or more groups of imaging clamps can be adopted, and different imaging clamps can be selected according to the actual sectional area measurement requirement of a cable to be measured; the distance baffle is attached to the section of the measured piece, so that the distance between the measured piece and the lens is fixed to obtain a high-resolution image, and the diffusion plate and the LED lamp provide a uniform illumination light source for the measured piece, so that a clear and high-resolution image is obtained. The processor of the main control unit processes a single image for no more than 2 s.
TABLE 1 lens optical parameters
In a specific example, the pixel of the optical imaging system of the imaging module is 1000 ten thousand, and the type of the photosensitive element is CMOS; the die set size was 38mmX38mm (+ -1 mm); the photosensitive size is 1/2.3'; the adjustable parameters comprise brightness, contrast, hue, saturation, definition gamma, white balance, backlight contrast and exposure value; the resolution adjustable range comprises: 640 × 480, 1024 × 768, 1280 × 720, 1280 × 960, 1600 × 1200, 1920 × 1080, 2048 × 1536, 2592 × 1944, 3264 × 2448, 3648 × 2736; the focusing mode is adjustable, and the focal distance can be manually focused or fixed.
The resistance testing range of the resistance measuring module is seven testing levels from 10m omega to 200k omega; the testing speed is variable: the slow speed is 2.5 times/second, and the fast speed is 10 times/second; has the zero clearing function.
The measuring frequency of the capacitance measuring module is 10kHz, 1kHz, 120Hz and 100Hz, and the four frequencies can be selected; the test signal level is 1.0V, 0.3V and 0.1V, which can be selected; the measuring range mode is kept and automatically selected; the measurement speed comprises a fast speed and a slow speed; the short circuit zero clearing and open circuit zero clearing functions are realized; equivalent modes include series and parallel (PAr) options; the internal resistance of the signal source is selectable to 30 omega and 100 omega.
The error of measuring the effective sectional area of the cable conductor by adopting the cable conductor comprehensive tester provided by the embodiment is less than 3 percent; the precision of the cable direct current resistance measurement is +/-0.05% +2 words, and the cable direct current resistance measurement device has a temperature correction function; the error in conductor length from resistance measurement is less than 1%; the cable capacitance measurement precision can reach 0.1%, and the error of the conductor length measured according to the capacitance is lower than 1%.
The utility model provides a cable conductor comprehensive tester introduces the image recognition technique and combines many electrical parameters to measure according to actual cable test demand, measures cable conductor's sectional area, unit length resistance and length isoparametric through multiple means, carries out cable conductor detection for the user and provides more effective accurate means.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A cable conductor comprehensive tester is characterized by comprising a main control unit, an imaging module interface and a power supply interface;
the imaging module is communicated with the main control unit through an imaging module interface and is used for drawing the cross section of the cable conductor to be detected, the main control unit calculates the cross section of the cable conductor according to the obtained image and obtains the length of the cable conductor according to the cross section; the power supply interface is used for accessing an external power supply to supply power for the main control unit and the imaging module.
2. The cable conductor comprehensive tester of claim 1, further comprising a capacitance measuring module, a capacitance testing interface;
one side of the capacitance test interface is connected with the capacitance measurement module, and the other side of the capacitance test interface is used as an external interface of the cable conductor comprehensive tester and is used for accessing a tested piece to carry out capacitance measurement; the capacitance test module and the main control unit have a connection relation for signal interaction.
3. The cable conductor comprehensive tester of claim 1 or 2, further comprising a resistance measurement module, a resistance test interface;
one side of the resistance test interface is connected with the resistance measurement module, and the other side of the resistance test interface is used as the other external interface of the cable conductor comprehensive tester and is used for accessing a tested piece to carry out resistance measurement; the resistance testing module is also connected with the main control unit for signal interaction.
4. The cable conductor comprehensive tester of claim 1 or 2, wherein the imaging module comprises an optical imaging system, an imaging fixture; the optical imaging system is used for collecting the image of the section of the tested cable, and one or more groups of imaging clamps arranged on the lens barrel of the optical imaging system are used for fixing the tested piece so that the central axis of the tested piece is parallel to the optical axis of the lens of the optical imaging system.
5. The cable conductor comprehensive tester as claimed in claim 4, wherein the imaging module further comprises a distance plate, the distance plate is fitted to the cross section of the tested cable, so that the distance between the tested piece and the lens of the optical imaging system is fixed to obtain a high resolution image.
6. The comprehensive cable conductor tester as claimed in claim 4, wherein the imaging module further comprises a diffuse light plate and a light source; the diffusion plate and the light source are arranged on one side, away from the measured piece, of the lens of the optical imaging system and used for providing a uniform illumination light source for the measured piece, and therefore clear and high-resolution images are obtained.
7. The comprehensive cable conductor tester as claimed in claim 1 or 2, further comprising a human-computer interaction unit having a connection relationship for signal interaction with the main control module; the main control unit sends the interface image of the tested piece collected by the imaging module to the man-machine interaction unit for displaying; the man-machine interaction unit is also used for receiving the input detection parameters and sending the detection parameters to the main control unit, and is used for displaying the sectional area of the cable conductor and the length of the cable conductor which are obtained by the main control unit through calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921899557.8U CN210802381U (en) | 2019-11-05 | 2019-11-05 | Cable conductor comprehensive tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921899557.8U CN210802381U (en) | 2019-11-05 | 2019-11-05 | Cable conductor comprehensive tester |
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| CN210802381U true CN210802381U (en) | 2020-06-19 |
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| CN201921899557.8U Active CN210802381U (en) | 2019-11-05 | 2019-11-05 | Cable conductor comprehensive tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148720A (en) * | 2022-12-30 | 2023-05-23 | 中国人民解放军空军工程大学航空机务士官学校 | Aviation cable line damage investigation method based on capacitance accurate measurement |
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2019
- 2019-11-05 CN CN201921899557.8U patent/CN210802381U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148720A (en) * | 2022-12-30 | 2023-05-23 | 中国人民解放军空军工程大学航空机务士官学校 | Aviation cable line damage investigation method based on capacitance accurate measurement |
| CN116148720B (en) * | 2022-12-30 | 2023-11-07 | 中国人民解放军空军工程大学航空机务士官学校 | Aviation cable line damage investigation method based on capacitance accurate measurement |
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