KR100999072B1 - Systems and methods for calibration of a welding current measuring device - Google Patents

Abstract

The present invention relates to a calibration system and a calibration method of a welding current meter for measuring the welding current and voltage of an electric welder, the calibration system according to the present invention and a current source for applying a current to the closed circuit so that the current flows through the closed circuit; And a welding current meter for calibration including a first sensing sensor installed in the closed circuit to detect current and voltage flowing in the closed circuit, and installed in the closed circuit to detect standard current and standard voltage flowing into the closed circuit. And a second detection sensor configured to compare current and voltage values detected by the first detection sensor with standard current and voltage values detected by the second detection sensor, and output a current and voltage deviation value. It includes. In addition, the calibration method according to the present invention comprises the steps of measuring the current and voltage values flowing through the electrode of the welder using a standard welding current meter and a welding current meter for calibration, respectively, the current and voltage measured by the standard welding current meter Calculating a current and voltage deviation value by comparing a value with current and voltage values measured by the welding current meter to be calibrated.

Welding machine, current, voltage, calibration, sensor

Description

Calibration system and method of calibration of welding current meter {SYSTEMS AND METHODS FOR CALIBRATION OF A WELDING CURRENT MEASURING DEVICE}

The present invention relates to a calibration system and a calibration method of a welding current meter, and more particularly, to easily calibrate the welding current meter to reduce the measurement deviation of the welding current meter used to measure the welding current and voltage of the electric welder. In addition, the present invention relates to a calibration system and a calibration method of the welding current measuring instrument which can improve the accuracy of the calibration to ensure the reliability of the welding current measuring instrument.

In general, welding is used to join two parts such as metal, glass, plastic, etc., and in various forms, such as electric welding, argon welding, extrusion welding, oxygen welding, arc welding, and resistance welding, depending on the shape thereof. Are classified. Double arc welding and resistance welding are electric welding methods and they are representative welding methods widely used throughout the industries such as shipbuilding, heavy industry, electronics, automobiles and heavy equipment.

The welding performance of such an electric welding machine is closely related to the product quality produced, so the research and development on the improvement of the welding machine is continuously being developed in the related industry. In addition, the welding quality maintenance of the electric welding machine affects the reliability, production efficiency, defect rate, etc. of the products produced by each company in many parts, many companies are making a lot of efforts to improve the performance of the welding machine.

In addition, there are many factors that determine the performance of the electric welder, but the most influential factor is the welding current at the moment of welding the product. Electric welding machine As the welding current flows instantaneous large current (hundreds of A to several hundred thousand A) in a relatively short time (several msec ~ several sec), it is impossible to measure the welding current with a general current measuring device. I am measuring it.

The welding current meter is a data acquisition device with a very short sampling time, a Rogowski coil capable of measuring the instantaneous rate of change of the current, and the data measured from the Rogowski coil to enable accurate measurement of the instantaneous change of the welder current. It consists of an integrator that can detect. These welding current measuring devices have been mainly imported and used in advanced welding technology countries such as Japan, Europe, etc., but in recent years, domestic product production is gradually increasing due to the increase in domestic demand and the improvement of domestic welding current measuring technology.

However, the welding current measuring device as described above causes a measurement error of the welding current due to the aging period, the surrounding environment, and the aging of the used parts. Accordingly, the welding current meter is required to maintain traceability from the national standard to secure the reliability of the measurement data. For this, "KS B ISO 17657-4 (Korean Industrial Standard) (resistance welding-resistance welding) is required. Welding current measurement) requires periodic calibration at least once a year in order to detect the welding current more accurately. However, since there are no systems or devices that can calibrate a welding current measuring device at present, there is an urgent need for a calibration method thereof.

The present invention has been made in order to improve the conventional problems as described above, the present invention is easy to calibrate the welding current meter to reduce the measurement deviation of the welding current meter used for measuring the welding current and voltage of the welder An object of the present invention is to provide a calibration system and a calibration method of a welding current meter, which can improve the accuracy of the calibration and ensure the reliability of the welding current meter.

In order to achieve the above object, a calibration system of a welding current meter according to an aspect of the present invention includes a current source for applying current to the closed circuit so that current can flow through the closed circuit, and a current and voltage flowing into the closed circuit. And a second detection sensor installed in the closed circuit so as to detect a current and voltage flowing into the closed circuit, and a welding current meter for calibration that includes a first detection sensor installed in the closed circuit. Standard welding current meter that sets the current and voltage detected by the sensor to the standard current and standard voltage, and compares the standard current and standard voltage with the current and voltage detected by the first sensing sensor to output current and voltage deviation values. Characterized in that it comprises a.

Here, the welding current meter to be calibrated is a signal processor for generating a signal by converting the current and voltage values measured by the first sensing sensor into a digital signal, and extracts current and voltage values by receiving a digital signal from the signal processor. And a controller for displaying the current and voltage values generated by the arithmetic processing unit on a display unit and transmitting them to the standard welding current meter.

In addition, the standard welding current measuring device is a signal processing unit for generating a signal by converting the current and voltage values measured by the second detection sensor into a digital signal, and receives the digital signal from the signal processing unit to extract the current and voltage values A current processor and a current processor for calculating current and voltage deviation values by comparing the standard current and voltage values with the current and voltage values input from the welding current meter for calibration, and the current and voltage values of the welding current meter for calibration, And a control unit for displaying the standard current and voltage values and the current and voltage deviation values on a display unit.

The standard welding current measuring device may further include a memory unit configured to store current and voltage values, the standard current and voltage values, and the current and voltage deviation values of the welding current measuring device for calibration.

In addition, the current source is characterized in that the electric welding machine.

In addition, the control unit for controlling the current so that the direct current and alternating current is selectively applied to the current source, characterized in that it further comprises.

In addition, the control unit is characterized in that for controlling the current source so that the output frequency and the output value of the current output to the closed circuit through the current source is controlled.

In addition, the output time of the current output to the closed circuit through the current source is 0.1 seconds or more so that the current and voltage values output to the closed circuit are sensed by the first and second detection sensors.

In order to achieve the above object, a calibration system of a welding current meter according to another aspect of the present invention, an electric welder for applying a current to the electrode so that the current can flow through the electrode, and detects the current and voltage flowing through the electrode A standard welding current measuring device including a first coil sensor is installed on the electrode so that it can be, and a second coil sensor is installed on the electrode to detect the current and voltage flowing to the electrode for calibration And a central controller configured to detect current and voltage deviation values by receiving current and voltage values of the electric welder respectively measured by the welding current meter, the standard welding current meter, and the welding current meter for calibration. .

Here, the calibration system is connected to the central control unit, the vision device for reading the current and voltage value of the electric welding machine displayed on the welding current meter to be calibrated by photographing and transmitting the vision device to the central control unit. It further comprises.

The vision apparatus may include a camera for photographing current and voltage values displayed on the welding current meter for calibration, and an image processing unit for processing the current and voltage values captured by the camera to read the current and voltage values. Characterized in that it comprises a.

The image processing unit may further include an image capture unit configured to read an image captured by the camera and capture the captured image, and a character recognizer to recognize a character in the still image captured by the image capture unit and transmit the character to the central controller. It is done.

The image processing unit may operate the camera when a measurement signal of the electric welding machine is input from the central controller, and reset the image capturing unit and the character recognition unit every time a picture taken by the camera changes. The controller may further include a control unit for controlling the image to be reprocessed.

The central controller may further include a calculation processor configured to calculate current and voltage deviation values by comparing standard current and voltage values input from the standard welding current meter with current and voltage values input from the welding current meter for calibration. And a control unit configured to display the standard current and voltage values of the standard welding current meter, the current and voltage values of the calibration current meter to be calibrated, and the current and voltage deviation values input to the operation processor. It features.

The central controller may further include the standard current and voltage values, the current and voltage values, the current and voltage deviation values respectively measured by the standard welding current meter and the calibration weld current meter inputted to the calculation processing unit. It further comprises a memory unit to be stored.

The control unit may control the electric welder so that the number of welding of the electric welder and the current value output to the electrode are controlled.

The central control apparatus may further include an input unit for selectively inputting the number of welding of the electric welder and an output value of the current output to the electrode.

In addition, the central control unit is controlled so that the output time of the current output to the electrode through the electric welder is applied for more than 0.1 seconds so that the current and voltage value output to the electrode is sensed by the first and second coil detection sensors Characterized in that.

In addition, the electric welding machine is characterized in that the resistance welding machine.

The electric welding machine may further include a cradle on which the first and second coil sensors are mounted such that the first and second coil sensors are installed at a predetermined interval.

In addition, the electric welding machine is characterized in that the coupling groove is formed so that the cradle is coupled, the cradle is formed in the "c" shape is inserted into the coupling groove is fixed.

In addition, the first and second coil detection sensor has a ring shape, it is characterized in that it is mounted with a predetermined interval up and down on the cradle so that the electrode is located in the center.

In order to achieve the above object, the calibration method of the welding current measuring device according to another aspect of the present invention, the current and voltage value flowing through the electrode of the welding machine is measured by using a standard welding current measuring device and a welding current meter for calibration, respectively. And comparing the current and voltage values measured by the standard welding current meter with the current and voltage values measured by the welding current meter to be calibrated to calculate current and voltage deviation values. .

Here, the calibration method is characterized in that it further comprises a welding environment setting step of setting the output current value of the welding machine.

In the welding environment setting step, the welding frequency of the welding machine, the operation of the welding machine, and the current form of the welding machine may be further set.

Further, in the welding environment setting step, the manufacturer, product name, product type, device number, operator and client information of the welding current measuring device for calibration may be further set.

In addition, the client information is characterized in that for entering the calibration number, address, company name, calibration date.

In addition, the calibration method is characterized in that the current and voltage values, the current and voltage deviation value, the information set in the welding environment setting step of the standard welding current meter and the welding current meter for calibration is stored in the central control unit. .

In addition, the calibration method is characterized in that it further comprises a search step to search and confirm the content stored in the central control unit.

In the searching step, the product name, calibration date, and calibration number of the welding current meter for calibration may be input and searched.

According to the calibration system and the calibration method of the welding current meter according to the embodiment of the present invention, the measurement results of the standard welding current meter and the welding weld current meter for calibration are automatically displayed through the display and the deviation is automatically calculated. As a result, the calibration task of the welding current meter for calibration can be processed quickly, thereby improving the efficiency of calibration.

In addition, you can enter the measurement environment, client information, and information on the welded welding current meter to be calibrated before taking measurements.When the measurement is completed, all the details of the measurement are stored together with the measurement results, so you can continuously manage the history of the measurement data. In addition to this, it also has the effect of simplifying the management of the customer and the welding current meter for calibration.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

Hereinafter, a calibration system and a calibration method of a welding current meter according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>

First, a calibration system of a welding current meter according to a first embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a block diagram showing a configuration of a calibration system of a welding current meter according to a first embodiment of the present invention.

Referring to FIG. 1, the calibration system of the welding current meter measures a current source 10 for applying current to the closed circuit 11 so that a current can flow through the closed circuit 11, and values of current and voltage flowing through the closed circuit 11. And a standard welding current meter 30 provided to detect a standard current value and a standard voltage value flowing through the weld current meter 20 for calibration and the closed circuit 11.

The welding current meter 20 to be calibrated includes a first detection sensor 21 installed in the closed circuit 11 to detect a current and a voltage flowing through the closed circuit 11. The first sensor 21 is manufactured by a coil, and has a circular shape. The first detection sensor 21 is installed so that the closed circuit 11 is located at the center and perpendicular to the closed circuit 11 so that the current and voltage flowing through the closed circuit 11 can be detected more accurately. In the present exemplary embodiment, the first sensor 21 is manufactured by using a coil in a circular form, for example. However, the coil may be manufactured in a square or polygon using the coil.

In addition, the welding current meter 20 to be calibrated measures the current value and the voltage value output through the closed circuit 11 by using the strengths of the electric and magnetic fields detected by the first detection sensor 21. To this end, the welding current measuring device 20 to be calibrated includes a signal processor 23 for converting an analog signal input from the first sensor 21 into a digital signal, and a value input from the signal processor 23. An arithmetic processing unit 25 and a control unit 29 for providing a display unit 27 with the results processed by the arithmetic processing unit 25.

The welding current meter 20 to be calibrated further includes an adjusting unit 28 capable of calibrating the welding current meter 20 to be calibrated through the standard current value and the standard voltage value detected by the standard welding current meter 30. do.

When the intensity of the electric and magnetic fields detected by the first detection sensor 21 is input as an analog signal, the signal processor 23 converts the input analog signal into a digital signal and inputs the digital signal to the controller 29. do. The control unit 29 inputs the input digital signal to the operation processing unit 25, and the operation processing unit 25 calculates the current and voltage values flowing into the closed circuit 11 by processing the input digital signal. The current and voltage values calculated by the operation processor 25 are provided to the display unit 27 by the control unit 25 and input to the standard welding current meter 30.

The standard welding current measuring device 30 is also installed in the closed circuit 11 so as to measure the standard current value and the standard voltage value by sensing the current and voltage flowing to the closed circuit 11, similar to the welding current measuring device 20 for calibration. The second sensor 31 is provided. The second detection sensor 31 is installed in the closed circuit 11 at a predetermined interval so as to be horizontal with the first detection sensor 21. At this time, the second detection sensor 31 is also installed so that the closed circuit 11 is located in the center and perpendicular to the closed circuit 11 so that the current and voltage flowing through the closed circuit 11 can be detected more accurately. In the present exemplary embodiment, the first sensor 21 is manufactured by using a coil in a circular form, for example. However, the coil may be manufactured in a square or polygon using the coil.

In addition, the standard welding current measuring device 30 compares the current value and the voltage value input from the welding current measuring device 20 to be calibrated with the standard current value and the standard voltage value detected by the second detection sensor 31. The signal processing section 33, the calculation processing section 35, and the control section 37 are included so as to detect the deviation value. In addition, the standard welding current measuring device 30 compares the current value and the voltage value input from the welding current measuring device 20 to be calibrated with the standard current value and the standard voltage value detected by the second detection sensor 31, and the deviation thereof. It further includes a display unit 38 on which the value is displayed, and a memory unit 39 in which the respective measured values are stored.

The signal processor 33 of the standard welding current measuring device 30 converts the input analog signal into a digital signal when the intensity of the electric and magnetic fields detected by the second detection sensor 31 is input as an analog signal. The signal is input to the controller 37. The control unit 37 inputs the digital signal to the calculation processing unit 35, and the calculation processing unit 35 calculates the current and voltage deviation values flowing to the closed circuit 11 by calculating the processing of the input digital signal. In addition, the calculation unit 35 compares the standard current and voltage sensed by the second detection sensor 31 with the current and voltage values input from the welding current meter 20 to be calibrated to calculate current and voltage deviation values. .

The standard current and voltage values, the current and voltage deviation values calculated from the arithmetic processing unit 35 are input to the control unit 37, and the control unit 37 displays these values on the display unit 38 and at the same time the memory unit ( 39). In addition, the control unit 37 also displays the measured current and voltage values input from the welding current measuring device 20 to be calibrated through the display unit 38 and simultaneously stores them in the memory unit 39.

In summary, the standard welding current meter 30 compares the measured standard current and voltage values with the current and voltage values measured by the welding current meter 20 to be calibrated, and calculates current and voltage deviation values. And the voltage values are displayed on the display unit 38 and stored in the memory unit 39.

On the other hand, the calibration system of the welding current meter according to the present embodiment further includes a control unit 40 for controlling the current to selectively apply a current input to the current source 10 as a direct current or an alternating current.

The control unit 40 controls the current source 10 to control the output frequency of the current and the output frequency of the current output to the closed circuit 11 through the current source 20. In addition, the control unit 40 of the current output to the closed circuit 11 through the current source 10 so that the current and voltage value output to the closed circuit 11 is sensed by the first and second detection sensors (21, 31). Control the output time so that it is more than 0.1 second. This is to allow the current flowing into the closed circuit 11 to be stably sensed through the first and second detection sensors 21 and 31.

Preferably, the current source 10 according to the present embodiment is an electric welder, and the closed circuit 11 is an electrode of the electric welder. When the electric welder is used as the current source 10, the first and standard welding current measuring devices 20, 30) preferably measures the region of the instantaneous current and the 10V voltage in the 25kA vs. current region.

In addition, in the present embodiment, the current and voltage generated in the closed circuit 11 are measured using the first and second sensing sensors 21 and 31 capable of measuring electric and magnetic fields. The current and voltage generated in (11) may be measured using Rogowski coils capable of measuring current and terminals capable of measuring voltage, respectively.

It will be described in detail the operation and operation of the calibration system of the welding current meter according to the first embodiment of the present invention configured as described above.

When the type, intensity, and number of measurements of the current applied to the control unit 40 as the current source 10 are set, a current having a constant intensity is periodically applied to the current source 10, and the applied current is applied through the closed circuit 11. Will flow.

The intensity of the current flowing through the closed circuit 11 is measured by the welding current meter 20 and the standard welding current meter 30 for calibration, and the standard welding current meter 30 is a standard current measured according to the number of measurements, respectively. And the voltage value, the current and voltage value input from the welding current meter 20 to be calibrated, and the current and voltage deviation values of the standard welding current meter 30 and the welding current meter 20 to be calibrated. Are stored in the memory unit 39 at the same time. When the current measurement is completed, the standard welding current measuring device 30 calculates and displays a current and voltage deviation value using all measured current and voltage values.

Accordingly, the current and voltage deviation of the welding current meter 20 to be calibrated may be calculated and adjusted using the current and voltage deviation values provided by the standard welding current meter 30. At this time, the adjustment of the welding current measuring device 20 for calibration is performed through the adjusting unit 28.

Second Embodiment

Next, the calibration system of the welding current meter according to the second embodiment of the present invention will be described in detail with reference to FIGS. 2 to 6.

2 is a block diagram showing a configuration of a calibration system of a welding current meter according to a second embodiment of the present invention, Figure 3 is a perspective view showing the configuration of a molten current measuring device and a vision device according to a second embodiment of the present invention, 4 is a block diagram showing a configuration of a vision apparatus according to a second embodiment of the present invention, Figure 5 is a block diagram showing a configuration of a central control apparatus according to a second embodiment of the present invention, Figure 6 is a present invention Figure 1 is a diagram showing the configuration of the cradle is installed first and second coil sensors according to the second embodiment of the.

Referring to FIG. 2, the calibration system of the welding current meter according to the second exemplary embodiment of the present invention may measure an electric welder 110 having an electrode 111, and values of current and voltage flowing through the electrode 111. It includes a standard welding current meter 120 and a welding current meter 130 for calibration.

The standard welding current measuring device 120 and the welding current measuring device 130 to be calibrated are first and second coil detecting sensors 121 installed at the electrodes 111 so as to detect when current flows to the electrode 111. And 131, respectively. The first and second coil sensors 121 and 131 have a circular shape, and are installed in the welder 110 so that the electrode 111 is located at the center so that the current and voltage values flowing through the electrode 111 can be detected more accurately. do. Here, the first and second coil detection sensors 121 and 131 detect the strength of the electric and magnetic fields when current flows to the electrode 111, and the standard welding current measuring device 120 and the welding current measuring device to be calibrated. 130 receives and calculates the strengths of the electric and magnetic fields to extract current flowing to the electrode 111.

Meanwhile, in the present embodiment, the current and voltage generated by the electrode 111 of the electric welding machine 110 are measured using the first and second coil detection sensors 121 and 131 capable of measuring electric and magnetic fields. For example, the current and voltage generated by the electrode 111 may be measured by using a Rogowski coil capable of measuring current and a terminal capable of measuring voltage, respectively.

In the calibration system of the welding current meter according to the embodiment of the present invention, the standard current and voltage values measured by the standard welding current meter 120 and the current and voltage values measured by the welding current meter 130 to be calibrated are respectively input. A vision device that reads and compares the central control unit 140 for calculating current and voltage deviation values and the current and voltage values displayed on the welding current meter 130 for calibration, and transmits them to the central control unit 140. It further includes 150.

The vision device 150 photographs the current and voltage values displayed on the welding current meter 130 to be calibrated, reads the current and voltage values, and then transmits the read current and voltage values to the central controller 140. . As such, after reading the current and voltage values displayed on the welding current measuring device 130 to be calibrated using the vision device 150 and transmitting them to the central controller 140, the welding current measuring device to be calibrated ( 130 is provided in various forms. In addition, the welding current measuring instrument 130 for commercial use currently has only a function of measuring and displaying a current and voltage value flowing to the electrode 111 and configured to transmit the measured current and voltage values. This is because it is not provided.

3 and 4, the welding current meter 130 and the vision device 150 to be calibrated will be described in more detail.

As shown in FIG. 3, the welding current meter 130 to be calibrated includes a second coil sensor 131 installed in the electric welding machine 110, and an analog measured by the second coil sensor 131. The main body 133 converts the signal into a digital signal to detect current and voltage values. The main body 133 and the second coil detecting sensor 131 are connected through the data transmission cable 135, and the display unit 137 is provided on the main body 133 to display the measured current and voltage values. The current and voltage values displayed on the display unit 137 of the welding current meter 130 to be calibrated are transmitted to the central control unit 140 through the vision device 150 connected to the central control unit 140.

The vision device 150 includes a camera 151 in which current and voltage values displayed on the display unit 137 of the welding current meter 130 for calibration are photographed, and a display unit 137 photographed in the camera 151. The image processing unit 153 reads the current and voltage values by processing the image.

Referring to FIG. 4, the image processing unit 153 of the vision device 150 may include an image capturing unit 153a for capturing an image captured by the camera 151, and a character in the image captured by the capturing unit 153a. And a controller 153c for controlling the image recognition unit 153b and the image capture unit 153a and the character recognition unit 153b. The image capturing unit 153a reads and captures an image from the camera 151 every time the camera 151 captures an image, and transmits the captured still image signal to the character recognition unit 153b.

The character recognition unit 153b reads a character from the still image input by the capture unit 153a and transmits the character data to the control unit 153c, and the control unit 153c transmits the character data to the central controller 140. .

In addition, the control unit 153c operates the camera 153a when the measurement signal of the electric welding machine 110 is input from the central control unit 140, and at the same time the capturing unit (i) changes the image captured by the camera 153a. 153a and the character recognition unit 153b are reset. This is to photograph the value displayed on the display unit 137 whenever the current measurement of the electric welder 110 is performed in the welding current meter 130 for calibration. Each time the camera 151 retakes the image, the capture unit 153b and the character recognition unit 153c are reset to reprocess the captured image.

In summary, the vision device 150 allows the camera 151 to read the calibration current so that the camera 151 can read the current and voltage values displayed on the display unit 137 whenever the measurement of the welding current meter 130 for calibration is performed. The display unit 137 is photographed in the same manner as the number of times for measuring the current of the measuring unit 130, and the character is detected from the photographed image and transmitted to the central controller 140. At this time, the capture unit 153a and the character recognition unit 153b read out the character before the next photographing of the camera 151 is performed.

Referring to FIG. 5, the central control unit 140 receives current and voltage values of the electric welding machine 110 from the standard welding current measuring device 120 and the vision device 150, respectively, and detects current and voltage deviation values. do. To this end, the central controller 140 includes an operation processor 141, a controller 143, a display 145, a memory 147, and an input unit 149.

The calculation processing unit 141 compares the standard current and voltage values input from the standard welding current measuring device 120 with the welding measurement current and voltage values of the welding current measuring device 130 to be calibrated from the vision device 150 to determine the current. And the voltage deviation value. The operation processor 141 transmits the standard current and voltage values, the welding measurement current and voltage values of the calibration current measuring instrument 130 to be calibrated, and the current and voltage deviation values to the controller 143.

The controller 143 stores these current and voltage values in the memory unit 147 and provides them to the display unit 145.

That is, the control unit 143 is a standard current and voltage of the standard welding current measuring unit 120 input to the calculation processing unit 141 whenever the measurement is made in the standard welding current measuring unit 120 and the welding current measuring unit 130 to be calibrated. The values, current and voltage values of the welding current meter 130 to be calibrated, and current and voltage deviation values are provided to the display unit 145 and stored in the memory unit 147.

In addition, the control unit 143 of the central controller 140 controls the electric welder 110 so that the output frequency and the output value of the current output to the electrode 111 through the electric welder 110 is controlled. In addition, the current output frequency and the current output value of the electric welding machine 110 controlled by the controller 140 may be set through the input unit 149. That is, the welding frequency and the output value of the current of the electrode 111 may be selectively input through the input unit 149. The output frequency of the current and the output value of the current are also stored in the memory unit 147.

Through the input unit 149 of the central control unit 140, the number of welding of the electric welder, the strength of the current applied to the electrode 111, the current form applied to the electric welder 110 and the welding current measuring instrument 130 for calibration Information of the manufacturer, product name, device number, device type, adjustment date, operator, and client may be further inputted.

In addition, the central controller 140 outputs the current and voltage values output from the electrode 111 to the electrode 111 through the electric welder 110 such that the first and second coil detection sensors 121 and 131 are detected. The electric welder 110 is controlled so that the output time of the current to be 0.1 seconds or more. This is to ensure a sufficient energization time of the current flowing to the electrode 111 so that the current and voltage values can be stably sensed through the first and second coil detection sensors 121 and 131.

On the other hand, the electric welding machine 110 according to the present embodiment is preferably a resistance welding machine, in this case, the standard welding current measuring device 120 and the welding current measuring device 130 to be calibrated, the instantaneous current and the 10V voltage of the 25kA vs current range It is desirable to measure the area of.

Referring to FIG. 6, in the electric welding machine 110 according to the present embodiment, the first and second coil detection sensors 121 are positioned such that the electrode 111 is positioned at the center of the first and second coil detection sensors 121 and 131. , 131 is provided with a cradle 113 is installed.

The electric welder 110 is formed with a coupling groove 115 into which the holder 113 is inserted and coupled to allow the holder 113 to be installed at a predetermined interval to be compatible.

Cradle 113 is formed of a "c" shape, the lower end is inserted into the coupling groove 115. Specifically, the cradle 113 is spaced apart at a predetermined interval upwards so as to be horizontal with the first cradle 113a and the first cradle 113a on which the first coil sensor 121 is installed, and the second coil sensor 131 is provided with a second mounting portion 113b. One end of the first mounting portion 113a is inserted into the coupling groove 115.

Installing the first and second coil detection sensors 121 and 131 in the electric welding machine 110 using the holder 113 is performed by the electrode 111 at the center of the first and second coil detection sensors 121 and 131. The electrode 111 is positioned at the center of the first and second coil detection sensors 121 and 131 at the same time so as to be easily positioned at the center thereof, thereby reducing the measurement deviation of the first and second coil detection sensors 121 and 131. To reduce it.

In this embodiment, the cradle 113 is described as an example of the "c" shape, but may be manufactured in any form as long as it can be installed in parallel with the first and second coil sensor (121, 131). In addition, the mounting position of the first and second coil detection sensors 121 and 131 may be changed to the holder 115.

From now on, the operation and operation of the calibration system of the welding current meter according to the second embodiment of the present invention configured as described above will be described in detail.

First, the first and second coil detection sensors 121 and 131 are installed in the holder 113 such that the electrodes 111 are positioned at the centers of the first and second coil detection sensors 121 and 131. The type and intensity of the electric current applied to the electric welding machine 110 through the input unit 149 of the 140, the number of times of measurement, etc. are set. In this state, when the electric welder 110 is operated, a current set by the central controller 140 is applied to the electric welder 110, and welding of the electrode 111 is periodically performed as many times as the number of measurements.

The current and voltage values generated at the electrode 111 during the welding of the electric welder 110 are measured by the standard welding current meter 120 and the welding current meter 130 to be calibrated, respectively. In this case, the standard current and voltage values measured by the standard welding current meter 120 are directly transmitted to the central controller 140, and the current and voltage values measured by the welding current meter 130 to be calibrated are vision devices 150. Is transmitted to the central control unit 140 through.

At this time, the current and voltage values displayed on the display unit 137 of the welding current measuring device 130 to be calibrated are photographed by the camera 151 of the vision device 150, and the current and voltage value characters are captured in the captured still image. The extracted text data is transmitted to the central control unit 140.

The central controller 140 compares the standard current and voltage values input from the standard welding current meter 120 with the current and voltage values input from the welding current meter 130 to be calibrated. The deviation value is calculated, and the standard current and voltage values, the current and voltage values, and the current and voltage deviation values are displayed on the display unit 145, respectively. At this time, the central control unit 140 calculates and displays current and voltage deviation values by calculating all current and voltage values calculated by the standard welding current measuring device 120 and the welding current measuring device 130 to be calibrated according to the number of measurements. do.

The current and voltage deviation values provided from the central controller 140 are compared with the current and voltage values measured by the welding current meter 130 to be calibrated, and the deviations are calculated to calculate the welding current meter 130 to be calibrated. Adjust it. At this time, adjustment of the welding current measuring device 130 to be calibrated is performed through an adjusting unit (not shown) provided in the welding current measuring device 130 to be calibrated.

Meanwhile, all measurement values and setting conditions input to the central controller 140 are stored in the memory unit 147, and the user may search for information and confirm and output the information stored in the memory unit 147 as necessary. .

Finally, with reference to Figures 2, 5 and 7 will be described in detail the calibration method of the welding current meter according to an embodiment of the present invention.

7 is a flowchart illustrating a calibration method of a welding current meter according to an exemplary embodiment of the present invention.

2, 5 and 7, in the calibration method of the welding current meter, first, the welding environment of the electric welder 110 is set through the input unit 149 of the central controller 140, and the electric welder 110 is used. ) To operate (S10). In the welding environment setting step (S10), the setting environment input table as shown in FIG. 8 is configured to display the welding conditions of the electric welding machine 110 and the information of the welding current measuring device 130 to be calibrated. 145 is displayed. And the welding environment of the electric welding machine 110 through the input table, for example, the measurement form (automatic or manual), the number of welding, the output current value, the current form (direct current or alternating current), the shape of the current supplied, the waveform Set the trigger current range during calculation.

In addition, information of the client and the welding current meter 130 to be calibrated may be further input through the input table. For example, client information (address, calibration number, company name, request date), calibration date, operator, etc. can be further input, and the manufacturer, product name, type, device number, And so on.

When the welding environment setting (S10) of the electric welder 110 as described above is completed, the measurement of the electric welder 110 starts (S20) and the output current and voltage output from the electrode 111 when welding the electric welder 110. The values are respectively measured using the standard welding current meter 120 and the welding current meter 130 to be calibrated (S30).

The standard current and voltage values measured by the standard welding current measuring device 120 and the current and voltage values measured by the welding current measuring device 130 to be calibrated, respectively, are transmitted to the central control unit 140 and input. 140 compares the standard current and voltage values with the current and voltage values to calculate current and voltage deviation values (S40). In this case, the standard current and voltage values, the current and voltage values, the current and voltage deviation values are displayed through the measurement table as shown in FIG. 9 and are stored in the memory unit 147 of the central controller 140. .

On the other hand, the central control unit 140 compares the welding frequency input in the welding environment setting step (S10) and the welding number currently measured (S41) and continues to measure if the number of welding times measured is less than the input welding number, If the measured welding number and the input welding number match, stop welding. In this case, the central controller 140 calculates the standard current and voltage values, the current and voltage values, and the current and voltage deviation values for each measurement number.

When the measurement of the electric welding machine 110 is completed through the above steps (S50), the welding current measuring device 130 for calibration is calibrated using the current and voltage deviation values (S60).

Meanwhile, the central controller 140 stores the measured measurement data in the memory unit 147, searches for the stored measurement data according to a search word input through the input unit 149, and displays the retrieved data on the display unit 145. (S51). Accordingly, the measured result may be checked and output again at any time through the process of searching the measurement data (S51). In the search step S51, a search table as shown in FIG. 10 is provided, and the measurement data corresponding to the measuring device or the client is searched by inputting a product name, a calibration date, and client information of the welding current measuring device 130 to be calibrated. can do.

In addition, the content provided to the display unit 145 of the central control unit 140 through the search step (S51) may be converted into Excel.

What has been described above is only one embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiment, and the present invention is made without departing from the gist of the present invention as claimed in the following claims. Anyone with ordinary knowledge in this field will have the technical spirit of the present invention to the extent that various modifications can be made.

1 illustrates in detail a calibration system of a welding current meter according to a first embodiment of the present invention.

2 is a block diagram illustrating a calibration system configuration of a welding current meter according to a second exemplary embodiment of the present invention.

3 is a perspective view showing the configuration of a molten current measuring device and a vision device according to a second embodiment of the present invention.

4 is a block diagram showing the configuration of a vision apparatus according to a second embodiment of the present invention.

5 is a block diagram showing the configuration of a central control apparatus according to a second embodiment of the present invention.

6 is a diagram illustrating a configuration of a cradle in which the first and second coil detection sensors according to the second embodiment of the present invention are installed.

7 is a flowchart illustrating a calibration method of a welding current meter according to an exemplary embodiment of the present invention.

8 is a view showing a setting environment input table provided in the calibration method of the welding current meter according to an embodiment of the present invention.

9 is a view showing a measurement result display table provided in the calibration method of the welding current meter according to an embodiment of the present invention.

10 is a view showing a search result search table provided in a method of calibrating a welding current meter according to an exemplary embodiment of the present invention.

♠ Code description for the main part of the drawing ♠

10 current source 11 closed circuit

20: welding current meter for calibration 30: standard welding current meter

40: control unit 110: electric welding machine

120: standard welding current meter 130: welding current meter for calibration

140: central control device 150: vision device

Claims (30)

A current source for applying current to the closed circuit so that current can flow through the closed circuit; A welding current meter for calibration including a first sensing sensor installed in the closed circuit to detect a current and a voltage flowing into the closed circuit; And And a second sensing sensor installed in the closed circuit so as to detect current and voltage flowing in the closed circuit, and setting the current and voltage detected by the second sensing sensor to a standard current and a standard voltage, A standard welding current meter configured to output a current and voltage deviation value by comparing a standard voltage and a current and voltage detected by the first detection sensor; Calibration system of a welding current meter, comprising a. The method of claim 1, The welding current meter to be calibrated includes: a signal processing unit for generating a signal by converting current and voltage values measured by the first detection sensor into a digital signal; An arithmetic processor configured to receive a digital signal from the signal processor and extract current and voltage values; And A control unit which displays the current and voltage values generated by the operation processor on a display unit and transmits the current and voltage values to the standard welding current measuring unit; Calibration system of a welding current meter, comprising a. The method of claim 1, wherein the standard welding current meter A signal processor for generating a signal by converting the current and voltage values measured by the second sensor into a digital signal; The digital signal is input from the signal processor to extract current and voltage values, and the current and voltage values are calculated by comparing the current and voltage values input from the welding current measuring device with the standard current and voltage values. Processing unit; And A control unit which displays a current and voltage value, the standard current and voltage value, and the current and voltage deviation value of the welding current meter for calibration; Calibration system of a welding current meter, comprising a. The method of claim 3, wherein The standard welding current measuring device further comprises a memory unit for storing the current and voltage values, the standard current and voltage values, the current and voltage deviation value of the welding current meter for calibration. The method of claim 1, And the current source is an electric welder. The method of claim 1, And a control unit for controlling the current such that direct current and alternating current are selectively applied to the current source. The method of claim 6, And the control unit controls the current source to control the output frequency of the current and the output value of the current output to the closed circuit through the current source. 8. The method according to any one of claims 1 to 7, And the output time of the current output to the closed circuit through the current source is 0.1 seconds or more so that the current and voltage values output to the closed circuit are sensed by the first and second detection sensors. An electric welder for applying a current to the electrode to allow a current to flow through the electrode; A standard welding current meter including a first coil detection sensor installed at the electrode to detect current and voltage flowing to the electrode; A welding current meter for calibration including a second coil sensor installed at the electrode to detect current and voltage flowing to the electrode; And A central control unit which receives current and voltage values of the electric welder respectively measured by the standard welding current meter and the calibration welding current meter to detect current and voltage deviation values; Calibration system of a welding current meter, comprising a. The method of claim 9, And a vision device which is connected to the central control unit, reads the current and voltage values of the electric welding machine displayed on the welding current meter for calibration through photographing, and transmits them to the central control unit. Calibration system of welding current meter. The method of claim 10, The vision apparatus includes a camera for photographing current and voltage values displayed on the welding current meter for calibration; And An image processing unit configured to read the current and voltage values by processing current and voltage value images photographed by the camera; Calibration system of a welding current meter, comprising a. The method of claim 11, The image processing unit An image capturing unit configured to read and capture an image captured by the camera; And A character recognition unit for recognizing a character from the still image captured by the image capturing unit and transmitting the character to the central controller; Calibration system of a welding current meter, comprising a. 13. The method of claim 12, The image processing unit operates the camera when the measurement signal of the electric welding machine is input from the central controller, and resets the image capturing unit and the character recognition unit every time the image photographed by the camera changes. And a controller for controlling the image to be reprocessed. The method of claim 9, wherein the central control unit A calculation processor for comparing current and voltage values input from the standard welding current meter with current and voltage values input from the welding current meter for calibration; And A control unit which displays on the display unit the standard current and voltage values of the standard welding current meter, the current and voltage values of the calibration current meter to be calibrated, and the current and voltage deviation values inputted to the calculation processing unit; Calibration system of a welding current meter, comprising a. The method of claim 14, The central controller stores the standard current and voltage values, the current and voltage values, and the current and voltage deviation values measured by the standard welding current meter and the calibration weld current meter, respectively, which are input to the processing unit. The calibration system of the welding current measuring device further comprises a memory. The method of claim 14, And the control unit controls the electric welder so that the number of welding of the electric welder and the current value output to the electrode are controlled. The method of claim 16, The central control apparatus further includes an input unit for selectively inputting the number of welding of the electric welder and the output value of the current output to the electrode. The method according to any one of claims 9 to 17, The central controller controls the output time of the current output to the electrode through the electric welder to be applied for at least 0.1 seconds so that the current and voltage values output to the electrode are sensed by the first and second coil detection sensors. A calibration system for a welding current meter, characterized in that. The method of claim 9, The electric welder is a resistance welder. The method of claim 9, The electric welding machine further includes a cradle on which the first and second coil sensors are mounted such that the first and second coil sensors are installed at predetermined intervals. The method of claim 20, The electric welding machine has a coupling groove is formed so that the cradle is coupled, the cradle is formed of a "c" shape is inserted into the coupling groove is fixed, the calibration system of the welding current meter. The method of claim 21, The first and second coil detection sensors have a ring shape, and the calibration system of the welding current meter, characterized in that mounted on the cradle with a predetermined interval up and down so that the electrode is located in the center. Measuring current and voltage values flowing through electrodes of the welder using a standard welding current meter and a welding current meter for calibration; And Calculating current and voltage deviation values by comparing the current and voltage values measured by the standard welding current meter with the current and voltage values measured by the welding current meter to be calibrated; Calibration method of a welding current meter, characterized in that it comprises a. The method of claim 23, And a welding environment setting step of setting an output current value of the welding machine. The method of claim 24, In the welding environment setting step, the welding number of the welding machine, the operation of the welding machine, the current type of the welding machine is further characterized in that the welding current measuring device. The method of claim 24, In the welding environment setting step, the manufacturer, product name, product type, device number, operator and client information of the welding current measuring device for calibration can be set further. The method of claim 24, The calibration method of the welding current meter, characterized in that for entering the calibration number, address, company name, calibration date in the client information. The method of claim 24, Calibration of the welding current meter, characterized in that the current and voltage values of the standard welding current meter and the welding current meter for calibration, the current and voltage deviation value, the information set in the welding environment setting step is stored in the central controller Way. 29. The method of claim 28, The calibration method of the welding current meter, characterized in that it further comprises a search step to search and confirm the content stored in the central control unit. 30. The method of claim 29, In the searching step, the calibration method of the welding current meter, characterized in that for searching by inputting the product name, the calibration date, the calibration number of the welding current meter for calibration.

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