CN110018350A - A kind of conductor DC resistance quick, intelligent measuring system online - Google Patents

Abstract

The invention relates to an on-line fast intelligent measurement system of conductor direct current resistance, which comprises a lifting platform, a constant temperature device is arranged on the lifting platform, the constant temperature device comprises a constant temperature box and a constant temperature control box, and a constant temperature box is provided Electric bridge fixture, the electric bridge fixture is connected with the digital electric bridge, the conductor inlet and outlet and the air inlet and outlet are arranged on the box I, a number of temperature sensors are arranged on the box cover, and the two ends of the lower part of box II are equipped with high-efficiency circulation The axial flow fan is connected with the air heater, and both the temperature sensor and the air heater are connected with the control module. The invention can satisfy the requirement that the conductor direct current resistance is not affected by the on-site ambient temperature during the on-line test process, and the test is carried out in a constant temperature environment, so as to solve the measurement error, material waste and waiting for the test result caused by the conductor direct current resistance test in the production process, and improve the Detect the accuracy of data, improve material utilization, and improve production efficiency.

Description

An online fast and intelligent measurement system for conductor DC resistance

technical field

The invention relates to a cable testing device, in particular to an on-line fast measuring system for direct current resistance of conductors.

Background technique

After the occurrence of the "Okai Cable" incident in Xi'an Metro, the country triggered a comprehensive special rectification and normalized supervision of wire and cable manufacturers, which directly promoted the wire and cable industry to accelerate from extensive speed and scale competition to competition in quality, brand and credit.

Wire and cable belong to the industry with heavy materials and light industry. As the main material of the cable, the conductor core mainly plays the role of transmitting current. The DC resistance of the conductor is one of the important indicators to characterize the electrical performance of the cable. Accurately measuring the DC resistance of the conductor is very important to control the product quality. and production costs play an important role. At present, the conductor DC resistance tester in the cable industry is a double-arm bridge and an ordinary fixture. During the test, the conductor temperature deviates greatly from the ambient temperature due to the compression die when the conductor is drawn. In order to obtain more accurate test results, inspectors usually Take a sample of about 1.5m and let the conductor cool down slowly in a constant temperature environment in the laboratory, striving for the test data to be closer to the true value, reducing the loss of copper material caused by the test error and the risk of non-compliance, but it also leads to a large time consumption And the material loss is large, therefore, only by realizing online detection, can the efficiency be improved and the cost controllable.

For a long time, the online measurement of conductor DC resistance in the whole industry has always been very confusing because of "inaccurate measurement". Among all the environmental factors that affect the DC resistance of the cable, its temperature/humidity is the most important factor. In the national standard GB/T3048.4-2007, it has been stipulated that the ambient temperature of the conductor DC resistance test is 15~25°C, the air humidity is not greater than 85%, and the ambient temperature change should not exceed ±1°C. However, in the production field test, it is impossible to complete the measurement under stable conditions. In this case, with the change of temperature, the DC resistance of the conductor will also change; therefore, during the measurement process, the measured value cannot truly reflect the out the actual resistance of the wire and cable. At present, there is no detection instrument with fewer errors in China to achieve higher requirements. To this end, it is also an inevitable trend of the development of the cable industry to improve the technical means of measurement, improve the level of quality control and the scientificity of controlling the consumption of conductor materials, and develop accurate conductor DC resistance online measurement devices.

SUMMARY OF THE INVENTION

Purpose of the invention: The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a fast and intelligent online measurement system for conductor DC resistance, which can satisfy the requirement that the conductor DC resistance is not affected by the on-site ambient temperature during the online test of the conductor DC resistance, and can be measured at a constant temperature. Environmental testing can solve the measurement error, material waste and waiting for test results caused by the detection of conductor DC resistance in the production process, improve the accuracy of test data, improve material utilization, and improve production efficiency.

Technical solution: In order to solve the above technical problems, an on-line fast and intelligent measurement system of conductor DC resistance according to the present invention includes a lifting platform, and a constant temperature device is arranged on the lifting platform, and the constant temperature device includes a constant temperature box. The incubator is provided with an electric bridge fixture, the electric bridge fixture is connected with the digital electric bridge, and a thermostatic control box is arranged beside the incubator. The incubator includes a box body I and a box cover. The body I is provided with a conductor inlet and outlet and an air inlet and outlet, and a number of temperature sensors are arranged on the box cover. The constant temperature control box includes a box II, and a circulating high-efficiency axial flow fan is arranged at both ends of the lower part of the box II. , a special nickel-chromium alloy heater is arranged on the fan pipe of the circulating high-efficiency axial flow fan, and a touch control screen, a digital display of the working temperature with a resolution of 0.1 °C, a main power switch, and a fan switch are arranged on the upper part of the box II. , heating switch, over-temperature indicator light and over-temperature protector, the temperature sensor and air heater are connected with the control module, with double over-temperature protection and machine leakage protection, safe and reliable. Air forced circulation in the incubator, uniform and stable temperature, reasonable distribution of temperature measurement points, meet the conductor DC resistance test standard GB/T3048.4-2007 "During the sample placement and test process, the change of ambient temperature should not exceed ± 1 ℃ ”, to meet the measurement requirements of temperature balance.

The conductor to be tested is placed on the bridge fixture in the box through the inlet and outlet of the conductors on both sides of the box body I.

The bridge fixture is clamped on the conductor to be tested in the box body I.

The conductor inlet and outlet are arranged on the left and right sides of the box body I.

The air inlet and outlet are arranged on the rear side of the box body I.

The control module includes a signal acquisition module and a microprocessor module, the signal acquisition module is connected with the temperature sensor, and the microprocessor module is connected with the air heater.

An over-temperature sensor is arranged beside the air heater, and the over-temperature sensor is connected with the microprocessor module.

The heating box includes a stainless steel shell and a polyurethane hard board insulation layer, and a silicone rubber sealing strip is provided at the connection between the box body I and the box cover.

The lifting platform can not only lift up and down, but also adjust the inclination angle, that is, it can be adjusted according to the inclination angle between the traction on the production line and the take-up line.

The system includes four parts: movable lifting platform, intelligent incubator, bridge fixture, QJ36B digital DC bridge, and has the function of automatic storage and transmission of detection data.

Main technical parameters of intelligent incubator:

Temperature control range: +0℃...+60℃;

Temperature uniformity: <±0.5℃;

Temperature fluctuation: <±0.5℃;

Power supply: AC220V 50HZ;

Power: 1.5KW.

The studio temperature is digitally displayed, controlled by a color touch screen, with correct control and intuitive reading, with a resolution of 0.1°C. Equipped with 5-point temperature monitoring function, it can continuously monitor the temperature of the test area. The circulating fan adopts a high-efficiency axial flow fan and is equipped with a special nickel-chromium alloy heater, which generates heat quickly and has sensitive control.

Beneficial effects: Compared with the prior art, the present invention has significant advantages as follows: the fan of the present invention is started, the air circulation of the system runs continuously, the air heating element controls the heating of the system under the action of the control module, and the control of the entire hot air system is stable and precise. , Multi-channel temperature measurement points to accurately measure the temperature of each part of the system, the entire bridge fixture is all placed in the incubator, the incubator can be raised and lowered with the measurement site position or adjust the test angle of the online wire and the bridge fixture, which is convenient for the actual operation on site , After the test is completed, the test data is displayed in real time and connected to the interface of the touch screen through the data acquisition module. In addition to the higher test accuracy, the QJ36B bridge can realize the automatic calculation, output, U disk storage and transmission of the conductor DC resistance. The function to the PC end meets the requirements of quality and cost control in the wire and cable industry.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the working principle schematic diagram of constant temperature device in the present invention;

Fig. 3 is the three-dimensional structure schematic diagram of the constant temperature device in the present invention;

Fig. 4 is the front view of the constant temperature device in the present invention;

FIG. 5 is a schematic diagram of the connection between the control module and the temperature sensor, the air heater and the over-temperature sensor in the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, an on-line fast intelligent measurement system of conductor DC resistance according to the present invention comprises a lifting platform 1, and a constant temperature is arranged on the lifting platform 1 Device 2, a bridge fixture 3 is provided in the thermostat device 2, the bridge fixture 3 is connected with the digital bridge 4, the thermostat device 2 includes a thermostat box 5, and a constant temperature box 5 is provided next to the thermostat box 5 The control box 6, the constant temperature box 5 includes a box body I7 and a box cover 8, the heating box 5 includes a stainless steel shell and a polyurethane hard board insulation layer, and a silicone rubber is provided at the connection between the box body I7 and the box cover 8 The sealing strip is provided with a conductor inlet and outlet 9 and an air inlet and outlet 10 on the box body I7. The conductor inlet and outlet 9 are arranged on the left and right sides of the box body I7, and the air inlet and outlet 10 are arranged at the rear of the box body I7. On the side, a number of temperature sensors 11 are arranged on the box cover 8, the constant temperature control box 6 includes a box body II 12, and a circulating high-efficiency axial flow fan is arranged at both ends of the lower part of the box body II 12. There is a nickel-chromium alloy heater on the fan pipe of the axial flow fan, and a touch control screen 15, a digital display of the working temperature with a resolution of 0.1°C, a main power switch, a fan switch, a heating switch, a superheater The temperature indicator light and the over-temperature protector are provided with a control module 18 in the box II 12. The temperature sensor 11 and the nickel-chromium alloy heater are all connected with the control module 18. The air in the constant temperature box 5 is forced to circulate, and the temperature is uniform. Stable, reasonable distribution of temperature measurement points, meet the conductor DC resistance test standard GB/T3048.4-2007 "during the sample placement and test process, the change of ambient temperature should not exceed ± 1 ℃", to meet the measurement requirements of temperature balance, The conductor to be tested 19 is placed on the bridge fixture 3 in the box through the conductor inlet and outlet 9 provided on both sides of the box body I7, and the bridge fixture 3 is clamped on the conductor to be tested 19 in the box body I7. The module 18 includes a signal acquisition module 20 and a microprocessor module 21, the signal acquisition module 20 is connected with the temperature sensor 11, and the microprocessor module 21 is connected with a nickel-chromium alloy heater, beside the nickel-chromium alloy heater An over-temperature sensor 22 is provided, and the over-temperature sensor 22 is connected with the microprocessor module 21 . The fan of the present invention starts, the system air circulates continuously, the air heating element controls the heating of the system under the action of the control module, the control of the whole hot air system is stable and accurate, and the temperature of each part of the system is accurately measured by the multi-channel temperature measurement points, and the whole electric bridge The fixtures are all placed in the incubator. The incubator can move up and down with the position of the measurement site or adjust the test angle of the online wire and the bridge fixture, which is convenient for the actual operation on the site. The interface is connected, in addition to higher test accuracy, the QJ36B bridge can realize the functions of fully automatic calculation, output, U disk storage and transmission to the PC terminal of the conductor DC resistance, which meets the requirements of quality and cost control in the wire and cable industry.

The present invention provides an idea and method, and there are many specific methods and approaches for realizing the technical solution. The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from Under the premise of the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (8)

1. An on-line fast intelligent measurement system for conductor direct current resistance, characterized in that it comprises a lifting platform (1), on which a constant temperature device (2) is provided, and a constant temperature device (2) is provided on the lifting platform (1). An electric bridge fixture (3) is provided inside, and the electric bridge fixture (3) is connected with the digital electric bridge (4). A constant temperature control box (6) is provided, the constant temperature box (5) includes a box body I (7) and a box cover (8), and a conductor inlet and outlet (9) and an inlet and outlet are arranged on the box body I (7). The tuyere (10) is provided with a number of temperature sensors (11) on the box cover (8), and the constant temperature control box (6) includes a box body II (12), two at the lower part of the box body II (12). A circulating fan (13) is provided at the end, an air heater (14) is provided on the fan pipeline of the circulating fan (13), and a touch control screen (15), equipment and A switch (16) and an indicator light (17), a control module (18) is provided in the box II (12), and the temperature sensor (11) and the air heater (14) are connected with the control module (18) connected. 2. The on-line fast and intelligent measurement system of conductor DC resistance according to claim 1, characterized in that: the conductor to be measured (19) is placed in the box through the conductor inlet and outlet (9) provided on both sides of the box body I (7). on the bridge clamp (3). 3. The on-line fast and intelligent measurement system of conductor DC resistance according to claim 2, wherein the bridge fixture (3) is clamped on the conductor to be measured (19) in the box body I (7). 4. The on-line fast and intelligent measurement system of conductor DC resistance according to claim 1, wherein the conductor inlet and outlet (9) are arranged on the left and right sides of the box body I (7). 5 . The on-line fast and intelligent measurement system of conductor DC resistance according to claim 1 , wherein the air inlet and outlet ( 10 ) are arranged on the rear side of the box body I ( 7 ). 6 . 6. The on-line fast and intelligent measurement system of conductor DC resistance according to claim 1, characterized in that: the control module (18) comprises a signal acquisition module (20) and a microprocessor module (21), the signal acquisition module (20) is connected with the temperature sensor (11), and the microprocessor module (21) is connected with the air heater (14). 7 . The online fast and intelligent measurement system for conductor DC resistance according to claim 6 , wherein an over-temperature sensor ( 22 ) is provided beside the air heater ( 14 ), and the over-temperature sensor ( 22 ) is connected to the air heater ( 14 ). 8 . The microprocessor module (21) is connected. 8. The on-line fast and intelligent measurement system of conductor DC resistance according to claim 1, characterized in that: the constant temperature box (5) comprises a stainless steel shell and a polyurethane hard board insulation layer, and the box body I (7) and the box A silicone rubber sealing strip is provided at the joint of the cover (8).