KR20140132860A - Multi monitoring apparatus for spot welding machine - Google Patents

Abstract

The present invention relates to a device for monitoring multiple spot welding machines (11, 12) a sensing means (20) installed in the each spot welding machine (11, 12) to generate a work-related signal; a controller (30) for inputting and storing the signal of the sensing means (20) in real time, and for displaying the signal in a screen (36) as a set pattern; and an external device (40) for selectively inputting and outputting information related to each spot welding machine (11, 12), storing and analyzing information with respect to each spot welding machine (11, 12), and providing update information including individual production. The present invention has an effect of maintaining the optimal state in terms of the welding quality and production management by inputting the working situation of multiple spot welding machines differently working, and determining whether the set condition is reached.

Description

[0001] The present invention relates to a multi-monitoring apparatus for a spot welding machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-monitoring apparatus for a spot welder, and more particularly, to a multi-monitoring apparatus for a spot welder for accurately and conveniently recognizing an operating situation of a plurality of spot welders to maintain an optimal welding state.

In general, welding monitoring systems are increasingly being used to provide data for measuring current, voltage and other related parameters in real time through various sensors in welding process and ensuring good welding quality. In particular, the need for comprehensive and efficient monitoring is increased in spot welding where welding is completed in a relatively short time. Prior art patents such as Korean Patent Laid-Open Publication No. 2009-006404 and Korean Patent Publication No. 1038569 are known in connection with this.

The prior art of the former is a process of detecting a pressure change in which the electrode presses the base material in accordance with the start of spot welding; Extracting an impact wave from the pressure change to determine a correlation between the thickness of the base material and the weld quality; Extracting a determination factor by analyzing the shock wave; Determining a fuzzy inference membership function by applying the extracted determination factor; And determining the quality of the welding result by applying the fuzzy rule base. Accordingly, the quality of the spot welding result can be stably monitored, and the effect of providing uniform quality and systematic management is expected.

The latter prior art includes the steps of sensing a welding time and a welding current using a current sensor; Determining a consumed charge amount during the operation time by using the detected operating time and the welding current of the welding machine; And comparing the amount of consumed electric charge with the amount of consumed electric charge set in advance in the process in which the welder operates, and determining whether the result of the welding worker's achievement of the target of each process is achieved or not. Thus, we expect the effect of evaluating the performance of the welding worker to increase the reliability of the performance information, and devote to improvement of the working environment and productivity.

However, in the former patent, it is appropriate to apply to the product development stage rather than the mass production stage because the calculation process for the detailed determination of the welding state is complicated, and the latter prior art patent deals with a variety of variables in a comprehensive manner, . Moreover, the above-mentioned prior art does not disclose a technique for monitoring a plurality of spot welders at the same time, thus showing a limit in the overall aspect of welding quality and production management.

Korean Patent Application Publication No. 2009-006404 "Spot Welding Monitoring Apparatus and Method" (Published on June 18, 2009) Korean Patent Registration No. 1038569 "Welding Monitoring System and Method" (Published on June 2, 2010)

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems of the prior art by inputting operating conditions for a plurality of spot welders having different work contents and determining whether a set condition is reached, In order to maintain the position of the spot welder.

In order to achieve the above object, the present invention provides an apparatus for monitoring a plurality of spot welders, comprising: sensing means installed in each spot welder for generating a signal related to a task; A controller for inputting and storing signals of the sensing means in real time and displaying the signals on a screen in a set pattern; And an external device for selectively inputting / outputting information related to each of the spot welders, storing and analyzing information about the respective spot welders, and providing update information including individual production amounts.

According to the present invention, the sensing means is characterized by comprising a pressure sensor for measuring the pressing force variation of the tip, a current sensor for measuring the variation of the welding current, and a temperature sensor for measuring the variation of the cooling water temperature.

According to the present invention, the controller includes a microcomputer, a keypad for inputting by user operation, a timer / counter for detecting a welding time and a production amount, an I / O port mounted on a set communication method, a screen for displaying information to a user, And a buzzer for alerting the user.

According to the present invention, the controller processes the operation status of the spot welder having different work contents in real time based on the RS-485 serial communication system.

It should be understood, however, that the terminology or words of the present specification and claims should not be construed in an ordinary sense or in a dictionary, and that the inventors shall not be limited to the concept of a term It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

Industrial Applicability As described above, according to the present invention, it is possible to input an operation state for a plurality of spot welders having different work contents and determine whether or not a set condition is reached, thereby maintaining an optimum state in terms of welding quality and production management.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram generally showing a monitoring device according to the present invention;
2 is a block diagram showing a main circuit configuration of a monitoring apparatus according to the present invention;
3 is a flowchart showing an input process of the monitoring apparatus according to the present invention.
4 is a photograph showing the screen output of the monitoring device according to the invention
5 is a graph showing stored data of the monitoring device according to the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to an apparatus for monitoring a plurality of spot welders (11) and (12). The spot welders 11 and 12 installed in production sites or research institutes of various industries are exemplified as monitoring targets, but the present invention is not necessarily limited to this but can also be applied to other types of welding machines. The spot welders 11 and 12 can equally apply AC spots, DC spots, and inverter spots.

According to the present invention, the sensing means 20 is installed in each of the spot welders 11 and 12 to generate a signal related to the operation. The spot welders 11 and 12 are widely used for welding thin plates in automobiles and electronic apparatuses. In general, the spot welders 11 and 12 perform the same work on the same parts in the production site. However, in some cases, they work on different parts. The sensing means 20 generates information relating to the pressing force, current density, and energization time, which are the main processing elements required for spot welding.

According to the detailed configuration of the present invention, the sensing means 20 includes a pressure sensor 21 for measuring the pressing force variation of the tip, a current sensor 23 for measuring the variation of the welding current, a temperature sensor 25). The pressure sensor 21 is provided at a portion for performing up and down movement of the electrode, and the current sensor 23 is installed at a portion for applying power to the electrode. In addition, a temperature sensor 25 is provided on a cooling water circulation path for discharging heat generated during spot welding.

According to the present invention, the controller 30 inputs and stores signals of the sensing means 20 in real time, and displays the signals on the screen 36 in a predetermined pattern. The controller 30 includes a microprocessor, a memory, and a microcomputer circuit having an input / output interface. The screen 36 may be integrally formed with the controller 30 or may be separately configured and connected by a cable. And is configured to connect the plurality of spot welders 11 and 12 to the controller 30 and the screen 36 by weaving them into one group. It is advantageous to combine the two spot welders 11 and 12 into one group in view of the convenience of monitoring and accuracy.

According to the detailed configuration of the present invention, the controller 30 includes a microcomputer 31, a keypad 32 input by a user operation, a timer / counter 33 for detecting a welding time and a production amount, an I / O port 35, a screen 36 for displaying information to the user, and a buzzer 37 for alarming under a predetermined condition. The keypad 32 is connected to send necessary information to the microcomputer 31, including the automatic / manual mode selection of the user. The timer / counter 33 measures the production amount and measures the tip dressing period with a different score of each spot welder 11 (12). The I / O port 35 is connected to the microcomputer 31 to convert the signals for the pressure sensor 21, the current sensor 23 and the temperature sensor 25 of the sensing means 20 into digital signals. The buzzer 37 is connected to the output terminal of the I / O port 35 to notify the occurrence of an error under the set condition.

According to the detailed configuration of the present invention, the controller 30 processes the operation status of the spot welders 11 and 12 having different work contents in real time based on the RS-485 serial communication system. RS-422 communication is a 1: 1 communication method in which data is exchanged between one master device and a slave device, whereas RS-485 is a communication method in which a plurality of spot welders 11 and 12 transmit and receive data on the same serial line It is preferred in terms of being able to. The individual monitoring operation can be controlled using the identifiable session key information for the spot welder 11 or the spot welder 12 on the one side according to the operation through the controller 30. [

In addition, according to the present invention, the external device 40 selectively inputs and outputs information associated with the respective spot welders 11 and 12. The external device 40 includes a local PC 41, a remote PC 42, a monitor 44, a printer 46, and the like. The local PC 41 is owned by the operator and is connected to the I / O port 35 of the controller 30 to exchange information. The remote PC 42 is installed in the integrated control room of the production site and can control the operations with respect to the plurality of spot welders 11 and 12. The monitor 44 is installed in a production site so that a large number of workers can easily observe it, and a size larger than a small size is preferred. The printer 46 is installed in a production site or an integrated control room, and outputs information as a document.

According to the detailed configuration of the present invention, the external device 40 stores and analyzes information on each of the spot welders 11 and 12, and provides update information including an individual production amount. The external device 40 stores various information generated during the work process of the spot welders 11 and 12, as well as analyzes the cause against the defect factors checked in the field. In some cases, information such as the amount of production, the tip dressing cycle, and the tip replacement cycle for each spot welder 11 and 12 can be updated through the external device 40.

3, when the controller 30 is turned on and the condition setting is started using the keypad 32, the target production amount, the tip dressing cycle, the tip exchange cycle , Single cycle period, etc., and set current upper and lower values, pressing force upper and lower values and temperature upper and lower values in the basic setting menu, and set current value, pressing force value and temperature value in the correction value ratio setting menu. After confirming the error and setting value again, input can be terminated.

The screen of the screen 36 is split so that the information on the side spot welder 11 or the spot welder 12 is displayed on the side of the spot welder 11 through the screen 36 as shown in FIG. (12) may be simultaneously displayed.

As shown in FIG. 5, information such as welding pressure, welding time, welding current, cooling water temperature, production amount, tip dressing cycle, tip replacement cycle, ). ≪ / RTI > For example, when a welding defect of a specific product occurs in a specific spot welder 11 or 12, the cause is analyzed based on the above information. Accordingly, it is judged that the pressing force exceeds the appropriate range after reaching the welding temperature and the strength is lowered due to the deformation of the weld portion, or the welding force is lowered because the pressing force is less than the proper range.

As described above, the present invention can secure competitiveness and market leadership by localization in a state of high reliance on foreign equipment.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

11, 12: spot welder 15: control board
20: sensing means 21: pressure sensor
23: current sensor 25: temperature sensor
30: controller 31:
32: Keypad 33: Timer / Counter
35: I / O port 36: Screen
37: buzzer 40: external device
41: Local PC 42: Remote PC
44: Monitor 46: Printer

Claims (4)

An apparatus for monitoring a plurality of spot welders (11, 12), comprising:
Sensing means (20) installed in each of the spot welders (11) (12) to generate a signal related to the work;
A controller (30) for inputting and storing signals of the sensing means (20) in real time and displaying them on a screen (36) in a set pattern; And
(11) and (12), storing and analyzing information about the respective spot welders (11) and (12), and providing update information including the individual production amount (40) for detecting the position of the spot welder. The method according to claim 1,
The sensing means 20 is provided with a pressure sensor 21 for measuring the pressing force variation of the tip, a current sensor 23 for measuring the variation of the welding current, and a temperature sensor 25 for measuring the variation of the cooling water temperature Wherein said multi-monitoring device is a multi-monitoring device for a spot welder. The method according to claim 1,
The controller 30 includes a microcomputer 31, a keypad 32 input by a user operation, a timer / counter 33 for detecting a welding time and a production amount, an I / O port 35 mounted on a set communication system, And a buzzer (37) for alerting under a predetermined condition. The method according to claim 1,
Wherein the controller (30) processes the operating state of the spot welder (11) (12) with different work contents in real time based on the RS-485 serial communication system.

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