Low voltage connector open circuit detection device

Abstract

The application discloses a low-voltage connector open circuit detection device, which comprises a casing, a detection circuit arranged in the casing, a millivolt meter connected with the detection circuit and a temperature display meter, two test rollers are rotatably connected to the lower ends of the casing respectively, and an infrared temperature measurement sensor is arranged at the middle of the bottom surface of the casing; a plurality of needle probes are equidistantly arranged on the test rollers, and the distance between two adjacent needle probes is equal to the distance between two adjacent terminals of the connector to be tested. The application can realize efficient detection of the open circuit hidden danger of the connector, adopts a unique roller type detection method, and is in harmony with the structure of the connector. During the test, the test device is rolled along the connector by the handle, and the roller probe can detect the contact resistance of each terminal in sequence. The detection time of each terminal is only about 0.5 seconds, the contact characteristics of each terminal can be detected without omission, the overall and accurate diagnosis of the terminal open circuit can be realized, and the open circuit hidden danger can be warned.

Description

TECHNICAL FIELD

[0001] The present application relates to power safety auxiliary device, particularly to a low-voltage connector open circuit detection device. BACKGROUND

[0002] The low-voltage connector is loose due to stress change or external reasons after a long time of operation, thereby causing defects to affect the stable operation of the power equipment. At present, the detection of the loose connector is usually carried out by manually directly pulling, which can only be applied to the power-off state of the equipment, and the feeling of the tightness of the wire is different from person to person, and lacks standard. In addition, the manual wire tightening work is large in the technical improvement and equipment replacement operation, and the tool and the connector are damaged due to improper force of the screwdriver, so it is necessary to provide the wire tightening work with a self-test torque. The number of low-voltage equipment connection terminals in the transformer substation is extremely large, however, until now, it is still mainly relied on the manual wire pulling to check whether the connection loop is tight, and the loose terminal hidden danger cannot be completely eliminated.

[0003] Therefore, it is necessary to provide a novel low-voltage connector open circuit detection device to solve the above problems. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a low-voltage connector open circuit detection device, which can realize efficient and comprehensive detection of the connector open circuit hidden danger.

[0005] To solve the above technical problems, one technical scheme adopted by the present application is to provide a low-voltage connector open circuit detection device, which comprises a shell, a detection circuit, a millivolt meter and a temperature display meter arranged in the shell, and a test roller rotatably connected to each end of the shell, and an infrared temperature sensor arranged at the middle of the bottom surface of the shell.

[0006] The test roller is provided with a plurality of needle probes at equal intervals, and the distance between the adjacent two needle probes is equal to the distance between the adjacent two terminals on the connector to be tested.

[0007] In a preferred embodiment of the present application, the detection circuit comprises a battery E, a switch S, a DC voltage reduction module, a constant current diode D1 and a clamping diode D2. The battery E is connected in series with the switch S and then divided into two paths, one of which is connected with the temperature display meter, and the other of which is connected with the power input end of the DC voltage reduction module. The power output end of the DC voltage reduction module is connected in series with the constant current diode D1 and then connected with the clamping diode D2. The test roller is connected in parallel with the clamping diode D2 and the millivolt meter.

[0008] In a preferred embodiment of the present application, the test rollers are made of red copper, and the axial distance between the needle probes on the two test rollers is equal to the distance between the inner and outer wire screw holes of the connector to be tested.

[0009] Further, the number of needle probes is 6-8.

[0010] In a preferred embodiment of the present application, the detection direction of the infrared temperature sensor is the direction directly below the shell.

[0011] In a preferred embodiment of the present application, the two side surfaces of the shell are further respectively provided with elastic knobs, and the lower edge of the elastic knob is in contact with the corresponding inner and outer wires of the connector terminal to be tested.

[0012] Further, the material of the elastic knob is brass.

[0013] In a preferred embodiment of the present application, the constant current of the constant current diode D1 is 1A.

[0014] In a preferred embodiment of the present application, the voltage of the power output end of the DC voltage reduction module is 0.1V.

[0015] In a preferred embodiment of the present application, the upper surface of the shell is further provided with an operating handle.

[0016] The present application has the following advantages:

[0017] (1) The present application can realize efficient detection of open circuit hidden troubles of connectors, adopts a unique roller type detection method, and resonates with the structure of the connector. During testing, the test device is rolled along the connector through the handle, and the roller probe can detect the contact resistance of each connector in turn. The detection time of an average terminal is only about 0.5 seconds, while the existing technology uses a milliohm meter for testing or manually pulls the wire head, which takes at least 5 seconds for one terminal, and is time-consuming and labor-intensive. For a power screen cabinet with hundreds of terminals, the detection efficiency of the present application is improved by ten times, which is of great significance for reducing the labor intensity of technical personnel.

[0018] (2) The present application can detect the contact characteristics of each terminal without omission. Since the present application adopts a unique roller rolling detection method, the omission problem in the connector detection process is eliminated. The existing technology relies on manual detection, and the human eye inevitably misses for numerous terminals, leaving hidden dangers. The present application can completely eliminate such hidden dangers.

[0019] (3) The present application can realize comprehensive and accurate diagnosis of terminal open circuit and can give early warning of open circuit hidden danger. The prior art detects the contact problem of the connector, and has the problem of poor detection effect. For example, manual wire pulling head can only determine the firmness of the contact, and cannot detect the carding problem. For example, milliohm table test cannot detect the situation that some screws are not clamped in place. The most important thing is that poor contact will lead to no open circuit during detection, but will gradually open circuit later. The detection method of the present application combines 1A large current low voltage contact voltage drop with infrared heating detection, which can better detect the situation that the screws are not clamped in place and the screws are loose. If clamped in place, the test current flows through the surface of the contact point, which is a point contact condition. In this way, the milliohm table cannot detect it, but the present application combines a large current with infrared temperature measurement, and through the measurement of the temperature of the internal conductor of the connector, any potential insignificant feature of the contact point can be displayed, thereby realizing comprehensive and accurate diagnosis of the terminal open circuit, and early warning of the connection terminal with future open circuit hidden danger due to increased contact resistance. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the low-voltage connector open circuit detection device of the present application and the tested connector;

[0021] Figure 2 is a circuit diagram of the detection circuit;

[0022] The labels of the components in the drawings are as follows: 1, operating handle, 2, machine shell, 3, millivolt table, 4, temperature display table, 5, infrared temperature measurement sensor, 6, test roller, 7, roller pin probe, 8, elastic dial ring, 9, DC voltage reduction module, 10, tested connector. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly and definitely defined.

[0024] Please refer to Figure 1 The embodiments of the present application include:

[0025] A low-voltage connector open circuit detection device, comprising a casing 2, a detection circuit, a millivolt meter 3 and a temperature display meter 4 are arranged in the casing 2, two test rollers 6 are respectively arranged at the lower ends of the casing 2, an infrared temperature sensor 5 is arranged at the middle of the bottom surface of the casing 2, and an elastic push ring 8 is arranged at each side surface of the casing 2, and the lower edge of the elastic push ring 8 is in contact with the corresponding inner and outer wires of the terminals of the connector 10 to be tested. Preferably, the elastic push ring 8 is made of brass. The special elastic push ring 8 can fluctuate the corresponding wires while the test roller 6 is rolling to test each terminal, so as to further sensitively find the loose terminals. For the convenience of use, a cylindrical operating handle 1 is arranged at the middle of the upper surface of the casing 2.

[0026] The test roller 6 is provided with a plurality of needle probes 7 at equal intervals, the interval between two adjacent needle probes 7 is equal to the distance between two adjacent terminals of the connector 10 to be tested, and the axial distance between the needle probes 7 on the two test rollers 6 is equal to the distance between the inner and outer wire screw holes of the connector 10 to be tested, so that when the test device is rolled along the connector 10, the needle probes 7 can sequentially test the contact resistance of each terminal of the connector 10. Preferably, the test roller 6 is made of red copper, the two test rollers 6 can be connected by a shaft or not, the number of the needle probes 7 on the test roller 6 is 6-8, and the material is also red copper.

[0027] In combination Figure 2 , the detection circuit comprises a battery E, a switch S, a DC voltage reduction module 9, a constant current diode D1 and a clamping diode D2, the battery E is connected in series with the switch S and then divided into two paths, one path is connected with the temperature display meter 4, and the other path is connected with the power input end of the DC voltage reduction module 9, the power output end of the DC voltage reduction module 9 is connected in series with the constant current diode D1 and then connected with the clamping diode D2, and the test roller 6 is connected in parallel with the clamping diode D2 and the millivolt meter 3. The constant current value of the constant current diode D1 is 1A, and the voltage of the power output end of the DC voltage reduction module 9 is 0.1V.

[0028] The present application adopts a unique roller type detection method, which is in response to the structure of the connector 10. During testing, the roller probe 7 can detect the contact resistance of each connector 10 in turn by rolling the testing device along the connector 10 through the operation of the handle 1. The roller realizes the function of detecting the contact resistance of each terminal of the connector 10. Through the low voltage of the DC voltage reduction module 9 and the 1A fixed current provided by the constant current diode D1, the contact characteristics of the connector 10 can be measured more quickly by testing the voltage drop across the terminals through the millivolt meter 3. The detection time of an average terminal is only about 0.5 seconds. In the prior art, the terminal is tested by a milliohm meter or the terminal is manually unplugged. At least 5 seconds are required for each terminal, which is time-consuming and laborious. For a power secondary screen cabinet with hundreds of terminals, the detection efficiency of the connector is improved by ten times by the present application, which is of great significance to reduce the labor intensity of secondary professionals.

[0029] The present application further adds infrared temperature measurement technology. The temperature change of the terminal when a larger test current flows through is further detected by non-contact infrared temperature measurement, so as to sensitively capture the abnormal signs of increased open circuit resistance from another aspect, so that the detection is more sensitive and effective.

[0030] In addition, since the present application adopts a unique roller rolling detection method, the omission problem in the connector detection process is eliminated. In the prior art, the eyes of the human are inevitably blurred and missed for numerous terminals, thereby leaving hidden dangers. The present application can completely eliminate such hidden dangers. The detection effect of the prior art for detecting the contact problem of the connector is not good. For example, the terminal can only be judged by manually pulling the wire, and the terminal cannot be detected for the card skin problem. For example, the milliohm meter test cannot detect the situation that the screw is not clamped in place. The detection method of the present application combines the 1A large current low voltage contact voltage drop and the infrared heating detection, which can better detect the screw not clamped in place and the loose screw. If the screw is not clamped in place, the test current flows through the surface of the contact point, which is a point contact condition, and the test current is small, so the milliohm meter cannot be measured. However, the present application combines the large current with the infrared temperature measurement, and the temperature of the internal conductor of the connector is measured by the infrared temperature measurement, so that any potential insignificant characteristics of the contact point can be displayed, thereby realizing the comprehensive and accurate diagnosis of the open terminal.

[0031] The above is only an embodiment of the present application, and does not limit the patent range of the present application. Any equivalent structure or equivalent flow conversion obtained by utilizing the content of the specification and drawings, or direct or indirect application in other related technical fields is also included in the patent protection range of the present application.

Claims

1. A low voltage connector open circuit detection device, characterized by, The shell is internally provided with a detection circuit, a millivolt meter and a temperature display meter, and two test rollers are respectively connected to the two ends of the lower part of the shell, and an infrared temperature sensor is arranged on the middle part of the bottom surface of the shell. The test rollers are equidistantly provided with a plurality of needle probes, and the distance between two adjacent needle probes is equal to the distance between two adjacent terminals on the connector to be tested. The detection circuit comprises a battery E, a switch S, a direct current voltage reduction module, a constant current diode D1 and a clamping diode D2. The battery E is connected in series with the switch S and then divided into two paths, one of which is connected with the temperature display meter and the other of which is connected with the power input end of the direct current voltage reduction module.

2. The low voltage connector open circuit detection apparatus of claim 1, wherein, The power output end of the direct current voltage reduction module is connected in series with the constant current diode D1 and then connected with the clamping diode D2.

3. The low voltage connector open circuit detection apparatus of claim 1 or 2, wherein, The lower edge of the elastic ring is in contact with the corresponding inner and outer wires of the terminals of the connector to be tested.

4. The low voltage connector open circuit detection apparatus of claim 1, wherein, The test rollers are made of red copper, and the axial distance between the needle probes on the two test rollers is equal to the distance between the two wire screw holes inside and outside the connector to be tested.

5. The low voltage connector open circuit detection apparatus of claim 1, wherein, The number of the needle probes is 6-8.

6. The low voltage connector open circuit detection apparatus of claim 1, wherein, The detection direction of the infrared temperature sensor is the direction away from the front of the shell.

7. The low voltage connector open circuit detection apparatus of claim 1, wherein, The material of the elastic ring is brass.

8. The low voltage connector open circuit detection apparatus of claim 1, wherein, The constant current value of the constant current diode D1 is 1A. The voltage of the power output end of the direct current voltage reduction module is 0.1V. The upper surface of the shell is further provided with an operating handle.

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