Detection device and detection method for stripping and polishing precision of cable joint

Abstract

The invention discloses a cable joint stripping and polishing precision detection device which comprises a driving and supporting unit, a polarization unit and a data acquisition and analysis unit. The driving and supporting unit comprises a bearing rotary table and a probe telescopic mechanism; the bearing rotary table is vertically fixed and circumferentially rotates to support the cable structure; the probe telescoping mechanism adjusts and supports a multifunctional probe of the data acquisition and analysis unit, and the multifunctional probe of the data acquisition and analysis unit firstly performs appearance scanning on the cable joint and then performs equidistant potential detection along the appearance contour of the cable joint; the polarization unit performs pressurized polarization on the outer contour of the cable joint. According to the method, a cable joint stripping and polishing process evaluation system can be effectively improved, the technical level of stripping and polishing is improved, safe and stable operation of the cable joint is guaranteed, and compared with a traditional means of identifying the polishing precision through roughness, the method has higher efficiency. According to the method, the stripping and polishing precision of the stripping and polishing surface of the cable joint can be detected from the aspect of electrical insulation.

Description

Technical Field

[0001] The invention relates to the technical field of cable construction, and in particular to a cable joint stripping and grinding accuracy detection device and a detection method. Background Art

[0002] As a key power equipment for realizing long-distance, large-scale and efficient transmission of electric energy, high-voltage cables are widely used in power transmission and distribution projects at home and abroad. Cable joints are used to connect various sections of lines, and their use increases rapidly with the increase of cable laying length. However, statistics show that cable operation accidents caused by cable joint failures are particularly serious, and most of the causes of failures are closely related to their stripping and polishing process. Due to the stripping process, there are scratches, protrusions, depressions and burrs on the surface of the semi-conductive layer of the joint interface. These defects will further cause charge accumulation and electric field distortion at the joint, thereby causing a series of engineering accidents including insulation failure. In this context, how to characterize the stripping and polishing process at the joint interface through effective detection means, so as to judge whether it meets the insulation requirements, is a key issue that needs to be solved urgently.

[0003] However, the existing detection technology for the stripping and grinding process of cable joint interfaces can only simply measure the roughness of the stripping surface, and cannot reflect its insulation reliability under the action of electrical stress. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a cable joint stripping and grinding accuracy detection device and detection method, so as to effectively improve the cable joint stripping and grinding process evaluation system, improve the technical level of stripping and grinding, and ensure the safe and stable operation of the cable joint.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A cable joint stripping and grinding accuracy detection device comprises a driving support unit, a polarization unit and a data acquisition and analysis unit; the driving support unit comprises a supporting turntable and a probe telescopic mechanism; the supporting turntable is fixed vertically and circumferentially rotated to support a cable structure; the probe telescopic mechanism adjusts and supports a multifunctional probe of the data acquisition and analysis unit, and the multifunctional probe of the data acquisition and analysis unit first scans the outer shape of the cable joint and then performs potential detection at equidistant intervals along the outer contour of the cable joint; the polarization unit performs pressurized polarization on the outer contour of the cable joint.

[0007] Preferably, the probe telescopic mechanism includes a vertically arranged lifting rail and a laterally arranged horizontal rail, wherein one side of the lifting rail lifts and slides to support the horizontal rail, and the horizontal guide rail slides to support a horizontal slider; the horizontal slider is fixedly supported by a multifunctional probe of a data acquisition and analysis unit arranged along the radial direction of the cable.

[0008] Preferably, the data acquisition and analysis unit includes a computer, an oscilloscope, an electrostatic voltmeter, a multifunctional probe of the data acquisition and analysis unit and an STM32 single-chip microcomputer connected in sequence, wherein the STM32 single-chip microcomputer is also connected to the computer; the multifunctional probe of the data acquisition and analysis unit includes a millimeter wave radar sensor and an electrostatic probe.

[0009] Preferably, the polarization unit includes a high-voltage DC power supply, a ring-shaped metal electrode and a ground wire, wherein the ring-shaped metal electrode is sleeved on the starting end of the potential detection outside the cable, and the ground wire is connected to the ending end of the potential detection outside the cable; the high-voltage DC power supply supplies power to the ring-shaped metal electrode.

[0010] A detection method for a cable joint stripping and grinding accuracy detection device, comprising the following steps:

[0011] S1. Fix the cable to be tested on the supporting turntable, fix the annular metal electrode on the starting end of the stripping and polishing surface of the tested joint, and connect the ground wire to the end of the stripping and polishing surface of the joint;

[0012] S2. applying a DC power supply to the surface to be tested using a high-voltage DC power supply to polarize each position of the stripped and polished surface and generate charge accumulation;

[0013] S3. Use a multi-function probe to scan the cable connector to be tested, and transmit the current signal data output by the millimeter wave radar sensor to the computer through the single chip microcomputer; after analysis and processing, the surface morphology information of the stripped and polished surface is obtained;

[0014] S4. The computer further issues instructions based on the actual topographic data of the stripping surface to control the scanning path of the stepper motor, so that the multi-function probe travels an equidistant scanning route to perform multi-directional and full-angle scanning of the stripping and polishing surface;

[0015] S5. Use a multi-function probe to scan the cable connector to be tested, and transmit the potential signal data output by the electrostatic probe to the computer through an electrostatic voltmeter and an oscilloscope; after analysis and processing, the surface potential information of the stripped and polished surface is obtained;

[0016] S6. Correlate and compare the collected surface potential data with the surface morphology to obtain the surface potential distribution corresponding to the local defects including scratches, protrusions, depressions and burrs on the stripped and polished surface of the cable connector;

[0017] S7. Finally, an accurate and effective evaluation of the precision of the cable connector stripping and grinding process is achieved.

[0018] The advantages and technical effects of the present invention are:

[0019] Cable joint stripping and grinding accuracy detection device of the present invention

[0020] The present invention adopts a modular design, in which the support turntable can flexibly adapt to cable connectors of different sizes and types, and can be quickly adjusted when the equipment is upgraded or replaced, effectively improving the versatility and adaptability of the equipment. The probe telescopic mechanism makes the movement of the multi-function probe more flexible, and the stripping and polishing surface can be fully scanned and inspected at different distances.

[0021] This device is based on a multifunctional probe, which can first collect the morphology information of the cable stripping and polishing surface, and then control the travel route of the electrostatic probe according to the morphology information and use the electrostatic probe to inspect the potential distribution information of the cable stripping and polishing surface. After processing and analyzing the collected data, it can accurately analyze and obtain the local defect information of the cable joint stripping and polishing surface, including scratches, protrusions, depressions and burrs.

[0022] Compared with the traditional method of identifying the grinding accuracy by the degree of roughness, this method can detect the grinding accuracy of the stripping and grinding surface of the cable connector from the perspective of electrical insulation.

[0023] In addition, this device uses the movable design of the supporting turntable and the probe telescopic mechanism. The supporting turntable vertically fixes the cable connector and drives the cable connector to rotate circumferentially. The probe telescopic mechanism slides equidistantly axially relative to the cable connector, so that the electrostatic probe can effectively achieve full-scale coverage potential measurement of the stripping and grinding surface, avoiding limitations in the measurement range. At the same time, the scanning path of the stepper motor is based on the morphological information detected by the millimeter-wave radar sensor. Therefore, the scanning height of the electrostatic probe can be accurately controlled during the potential scanning process, thereby obtaining more accurate surface potential distribution information. This enables a more comprehensive and accurate stripping and grinding accuracy detection.

[0024] During the test, the entire test process is controlled by a programmed control circuit through computer settings, which can realize fully autonomous testing without manual assistance, thus achieving an automated level of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the connection structure of the device of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the supporting turntable and the probe telescopic mechanism in the present invention;

[0027] Figure 3 This is a model diagram of the cable connector of the present invention.

[0028] Figure 4 This is a surface potential test data diagram of the present invention.

[0029] Figure 5 The present invention is a flow chart of the detection method.

[0030] In the figure:

[0031] 1-supporting turntable; 2-probe telescopic mechanism; 3-high voltage DC power supply; 4-annular metal electrode; 5-multifunctional probe; 6-STM32 single chip microcomputer; 7-electrostatic voltmeter; 8-oscilloscope; 9-computer; 10-cable connector; 11-outer semi-conductive layer; 12-stripped and polished surface; 13-insulating layer; 14-inner semi-conductive layer; 15-conductor; 16-lifting guide rail; 17-horizontal slider; 18-horizontal guide rail. DETAILED DESCRIPTION

[0032] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings. It should be noted that the embodiments are illustrative, not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0033] The present invention discloses a cable joint stripping and grinding precision detection device, comprising a driving support unit, a polarization unit and a data acquisition and analysis unit; the driving support unit comprises a supporting turntable 1 and a probe telescopic mechanism 2; the supporting turntable is vertically fixed and circumferentially rotated to support a cable structure; the probe telescopic mechanism adjusts and supports a multifunctional probe 5 of the data acquisition and analysis unit, and the multifunctional probe of the data acquisition and analysis unit first performs an outer shape scan on a cable joint 10 and then performs an equidistant potential detection along the outer contour of the cable joint; the polarization unit performs pressurized polarization on the outer contour of the cable joint.

[0034] Preferably, the probe telescopic mechanism includes a vertically arranged lifting rail and a laterally arranged horizontal rail, wherein one side of the lifting rail lifts and slides to support the horizontal rail, and the horizontal guide rail slides to support a horizontal slider; the horizontal slider is fixedly supported by a multifunctional probe of a data acquisition and analysis unit arranged along the radial direction of the cable.

[0035] Preferably, the data acquisition and analysis unit includes a computer 9, an oscilloscope 8, an electrostatic voltmeter 7, a multifunctional probe of the data acquisition and analysis unit and an STM32 single-chip microcomputer 6 connected in sequence, wherein the STM32 single-chip microcomputer is also connected to the computer; the multifunctional probe of the data acquisition and analysis unit includes a millimeter wave radar sensor and an electrostatic probe.

[0036] Preferably, the polarization unit includes a high-voltage DC power supply 3, a ring-shaped metal electrode 4 and a ground wire, wherein the ring-shaped metal electrode is sleeved on the starting end of the potential detection outside the cable, and the ground wire is connected to the ending end of the potential detection outside the cable; the high-voltage DC power supply supplies power to the ring-shaped metal electrode.

[0037] A detection method for a cable joint stripping and grinding accuracy detection device, comprising the following steps:

[0038] S1. The cable to be tested is fixed on the supporting turntable, the annular metal electrode is fixed to the stripping and polishing surface of the tested joint 12 to detect the starting end, and the ground wire is connected to the end end of the stripping and polishing surface of the joint;

[0039] S2. applying a DC power supply to the surface to be tested using a high-voltage DC power supply to polarize each position of the stripped and polished surface and generate charge accumulation;

[0040] S3. Use a multi-function probe to scan the cable connector to be tested, and transmit the current signal data output by the millimeter wave radar sensor to the computer through the single chip microcomputer; after analysis and processing, the surface morphology information of the stripped and polished surface is obtained;

[0041] S4. The computer further issues instructions based on the actual topographic data of the stripping surface to control the scanning path of the stepper motor, so that the multi-function probe travels an equidistant scanning route to perform multi-directional and full-angle scanning of the stripping and polishing surface;

[0042] S5. Use a multi-function probe to scan the cable connector to be tested, and transmit the potential signal data output by the electrostatic probe to the computer through an electrostatic voltmeter and an oscilloscope; after analysis and processing, the surface potential information of the stripped and polished surface is obtained;

[0043] S6. Correlate and compare the collected surface potential data with the surface morphology to obtain the surface potential distribution corresponding to the local defects including scratches, protrusions, depressions and burrs on the stripped and polished surface of the cable connector;

[0044] S7. Finally, an accurate and effective evaluation of the precision of the cable connector stripping and grinding process is achieved.

[0045] In addition, in the present invention, preferably, the supporting turntable adopts a mature product in the prior art.

[0046] In addition, the cable connector structure detected by the present invention is as follows Figure 3 As shown, the cable connector includes an outer semiconductive layer 11, a stripped and polished surface 12, an insulating layer 13, an inner semiconductive layer 14, and a conductor 15.

[0047] In addition, the present invention preferably has photoelectric sensors on both the lifting rail and the horizontal rail, which are used to monitor the position of the multifunctional probe on the rail in real time. The positioning accuracy of the sensor reaches 0.01mm, and it is linked with the horizontal slider to ensure that the cable connector is always in the best measurement position. The stepper motor on the horizontal rail is coupled to the horizontal slider rail drive wheel through a 1:10 reduction gear. The step angle can be selected from 0.9°, 1.8° or 3.6°, and the preferred step angle is 1.8°. A high-precision step distance of 1mm can be achieved under a single pulse drive.

[0048] In order to more clearly illustrate the specific implementation mode of the present invention, an embodiment is provided below:

[0049] A cable joint stripping and polishing accuracy detection device of the present invention takes the cable joint as the measurement object, utilizes a multi-function probe to measure the surface morphology and collect the charge of the stripped and polished surface, and processes and analyzes the collected information to correspond to the specific defect type and quantity, and finally realizes the accurate detection of the polishing process accuracy.

[0050] In addition, the multifunctional probe in the present invention is mainly used to realize the data acquisition function. On the one hand, the millimeter wave radar sensor in the multifunctional probe first scans the surface of the stripping and polishing surface, and then transmits the collected information to the ADC module of the STM32 single-chip microcomputer in the form of a current signal, obtains a digital signal of the distance, and transmits it to the computer. After processing and converting the signal, the surface morphology of the stripping and polishing surface of the joint is obtained. On the other hand, based on the actual surface morphology of the stripping surface, the computer further issues a scanning instruction to control the stepper motor, so that the multifunctional probe performs a multi-directional and full-angle scan on the stripping and polishing surface according to the required scanning route. In this process, the main role is the electrostatic probe, which is always parallel to the test surface and maintains a constant distance during the measurement process.

[0051] In addition, the collection of surface morphology data in the present invention mainly relies on the millimeter wave radar sensor in the multifunctional probe. The millimeter wave radar sensor in the multifunctional probe first scans the surface of the stripped and polished surface, and then transmits the collected information to the ADC module of the STM32 single-chip microcomputer in the form of a current signal, obtains a digital signal of the distance, and transmits it to the computer. After processing and converting the signal, the surface morphology of the stripped and polished surface of the joint is obtained.

[0052] Moreover, in the present invention, based on the actual surface morphology of the stripping surface, the computer further issues a scanning instruction to control the stepper motor, so that the multi-function probe performs multi-directional and full-angle scanning on the stripping and polishing surface according to the required scanning route. In this process, the main function is the electrostatic probe, which is always parallel to the test surface and maintains a constant distance during the measurement process, and collects the surface potential distribution information of the test surface. The electrostatic voltmeter can display the surface potential value obtained by the detection in real time. The oscilloscope is used to record and organize the measured potential signal, and record and collect relevant data.

[0053] In addition, in the present invention, based on the collected measurement results of local charge accumulation on the stripping surface of the connector, the computer performs data analysis. In the data analysis process, the morphology and potential distribution of defects including but not limited to scratches, protrusions, depressions and burrs on the stripping and polishing surface of the cable connector are considered to locate and classify the defects. Finally, the stripping and polishing accuracy of the stripping and polishing surface of the cable connector is accurately evaluated.

[0054] The measurement process of the present invention is as follows:

[0055] First, the cable connector to be measured is placed on the supporting turntable 1, and the outer semiconductive layer 11 is pressure-polarized using the high-voltage DC power supply 3 and the annular metal electrode 4. Specifically, the high-voltage power supply is turned on, and a DC voltage is applied to the surface to be measured, and maintained for a certain period of time. In this process, the surface of the stripped and polished semiconductive layer is polarized, and a corresponding amount of charge accumulation occurs.

[0056] After polarization, the motor drive module is used to control the operation of the equipment and perform data collection. In this process, the multifunctional probe 5 is used to realize data collection, and the multifunctional probe has two functions: morphology measurement and charge collection. The millimeter wave radar sensor is used to collect the morphology information of the stripping surface. The collected information is transmitted to the computer 9 through the STM32 single chip microcomputer 6. After analysis, the corresponding instructions are generated to control the stepper motor 2 to drive the electrostatic probe 5 to measure the surface charge of the stripping surface at equal intervals.

[0057] In the above process, the multifunctional probe 5 always moves up and down at equal intervals from the surface to be tested and maintains a constant distance. In the process of data collection, the electrostatic voltmeter 6 displays the surface potential value of the surface to be tested in real time, and the oscilloscope 7 records and transmits data synchronously.

[0058] At the end of the whole test process, the computer processes and analyzes the collected full-scale potential measurement data covering the entire stripping and polishing surface, and sorts out the Figure 3 The potential distribution information is shown. Based on the measurement results, the location and size of defects such as scratches, protrusions, depressions and burrs on the stripping and polishing surface of the cable connector are accurately reflected. Finally, the stripping and polishing accuracy of the stripping and polishing surface of the cable connector is accurately evaluated.

[0059] Finally, it is preferred that the parts of the present invention not fully described adopt mature products and mature technical means in the prior art.

[0060] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A cable joint stripping and grinding accuracy detection device, characterized in that: It includes a driving support unit, a polarization unit and a data acquisition and analysis unit; the driving support unit includes a supporting turntable and a probe telescopic mechanism; the supporting turntable is fixed vertically and circumferentially rotates to support the cable structure; the probe telescopic mechanism adjusts the multifunctional probe supporting the data acquisition and analysis unit, and the multifunctional probe of the data acquisition and analysis unit first scans the shape of the cable connector and then performs potential detection at equidistant intervals along the shape contour of the cable connector; the polarization unit pressurizes and polarizes the external contour of the cable connector.

2. A cable joint stripping and polishing accuracy detection device according to claim 1, characterized in that: The probe telescopic mechanism includes a vertically arranged lifting rail and a horizontally arranged horizontal rail, wherein one side of the lifting rail lifts and slides to support the horizontal rail, and the horizontal rail slides to support a horizontal slider; the horizontal slider is fixedly supported by a multifunctional probe of a data acquisition and analysis unit arranged along the radial direction of the cable.

3. A cable joint stripping and grinding accuracy detection device according to claim 1, characterized in that: The data acquisition and analysis unit includes a computer, an oscilloscope, an electrostatic voltmeter, a multifunctional probe of the data acquisition and analysis unit and an STM32 single-chip microcomputer connected in sequence, wherein the STM32 single-chip microcomputer is also connected to the computer; the multifunctional probe of the data acquisition and analysis unit includes a millimeter wave radar sensor and an electrostatic probe.

4. A cable joint stripping and grinding accuracy detection device according to claim 1, characterized in that: The polarization unit includes a high-voltage DC power supply, a ring-shaped metal electrode and a ground wire, wherein the ring-shaped metal electrode is sleeved on the potential detection starting end outside the cable, and the ground wire is connected to the potential detection ending end outside the cable; the high-voltage DC power supply supplies power to the ring-shaped metal electrode.

5. A detection method for the cable joint stripping and grinding accuracy detection device as claimed in claim 1, characterized in that: The following steps are involved: S1. Fix the cable to be tested on the supporting turntable, fix the annular metal electrode on the starting end of the stripping and polishing surface of the tested joint, and connect the ground wire to the end of the stripping and polishing surface of the joint; S2. applying a DC power supply to the surface to be tested using a high-voltage DC power supply to polarize each position of the stripped and polished surface and generate charge accumulation; S3. Use a multi-function probe to scan the cable connector to be tested, and transmit the current signal data output by the millimeter wave radar sensor to the computer through the single chip microcomputer; after analysis and processing, the surface morphology information of the stripped and polished surface is obtained; S4. The computer further issues instructions based on the actual topographic data of the stripping surface to control the scanning path of the stepper motor, so that the multi-function probe travels an equidistant scanning route to perform multi-directional and full-angle scanning of the stripping and polishing surface; S5. Use a multi-function probe to scan the cable connector to be tested, and transmit the potential signal data output by the electrostatic probe to the computer through an electrostatic voltmeter and an oscilloscope; after analysis and processing, the surface potential information of the stripped and polished surface is obtained; S6. Correlate and compare the collected surface potential data with the surface morphology to obtain the surface potential distribution corresponding to the local defects including scratches, protrusions, depressions and burrs on the stripped and polished surface of the cable connector; S7. Finally, an accurate and effective evaluation of the precision of the cable connector stripping and grinding process is achieved.

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