RU2196029C2 - Method for measuring speed of electrode wire feed - Google Patents

Abstract

FIELD: welding production, possibly different branches of machine engineering, namely apparatuses for registering parameters of automatic welding processes. SUBSTANCE: method comprises steps of measuring speed of electrode wire feed by means of photoelectric converter base pickup; passing electrode wire supplied from bobbin into feeding mechanism through said pickup; using pickup whose sensing member is frictionally connected with electrode wire in zone between bobbin and rollers of feeding mechanism; transforming reciprocation motion of electrode wire to electric pulses with repetition frequency proportional to speed of electrode wire feed. EFFECT: enhanced accuracy of measurement due to placing pickup directly into electrode wire. 2 dwg

Description

 The invention relates to the field of welding production and can be used to determine the feed speed of the electrode wire in devices for recording parameters of automated welding processes.

 The known method [1], based on the conversion of the rotation of the drive shaft of the feed mechanism using a tachogenerator into an electrical signal, the amplitude of which is directly proportional to the frequency of rotation of the shaft.

 The disadvantage of this method is: the need for calibration when changing the type of feed mechanism, the inability to take into account the error introduced by the slipping of the electrode wire.

 The prototype of the present invention selected the method described in [2], based on counting the number of electrical pulses per unit time generated by a photoelectric converter with a mechanical modulator, the drive of which is kinematically connected with the rollers of the feeding device. The output pulses of the photoelectric converter, the frequency of which is directly proportional to the feed speed of the electrode wire, is recorded by the counter per unit time and converted to speed. The disadvantages of this method are: the need for calibration when changing the type of feed mechanism, the inability to take into account the error introduced by the slipping of the electrode wire in the feed mechanism.

 The technical result that can be obtained by implementing the method is expressed as eliminating the measurement error resulting from slipping wire between the rollers of the feed mechanism, and also eliminating the dependence of the measurement results on the geometric dimensions of the rollers of the feeding mechanism.

 To achieve the specified technical result in the proposed method, which includes measuring the electrode wire feed speed using a sensor based on a photoelectric converter, a feature is that when the electrode wire is fed from the coil into the feed mechanism, it is passed through a sensor having a mechanical modulator with a drive and sensitive element. The sensor element is frictionally connected to the electrode wire in the area between the coil and the rollers of the feed mechanism. In this case, the translational motion of the electrode wire is converted into electrical pulses, the repetition rate of which is proportional to the wire feed speed.

The method is illustrated by drawings, which depict:
in FIG. 1 is a diagram of an implementation of the method, FIG. 2 - sensor device.

The method is as follows:
A sensor (3) is connected to the feed path (1) of the feed mechanism (2). The welding wire (4) coming from the coil (5) is passed through the sensor and, with its movement, activates the sensor element. Thus, any changes in the wire speed are reflected in the measurement results.

 The sensor is made in the form of a separate unit installed on the feeding path of the feeding mechanism, and consists of a housing (3) in which a shaft (6), a clamping device (7), a guide (8) and a photoelectric converter (9) are installed. A roller (sensing element) (10) is rigidly fixed on the shaft, the shaft and the sensing element fixed on it form a drive. A mechanical modulator (11) is also mounted on the drive shaft. A mechanical modulator has a certain number of holes located at an equal distance around a circle having a center common with the modulator. The photoelectric converter is a coaxially arranged emitter and photodetector. The sensor housing is mounted on the feed path of the feed mechanism to the feed rollers. The welding wire is passed through the guide (8), pressed by the device (7) to the roller (10) of the shaft (6) and then inserted into the guide of the feed mechanism according to the traditional scheme. Thus, when the wire moves, its translational motion is converted into rotational motion of the shaft (6) and the mechanical modulator (11). At the moment of combining the aperture of the modulator with the optical axis of the optical pair, an electrical signal is generated at the output of the IR receiver, the value of which corresponds to a logical level of "1". Knowing the ratio of the circumference of the roller (10) and the circumference on which the holes of the modulator are located, one can recalculate the number of pulses per unit time in the wire feed speed.

 When using the sensor as part of computer-based recording devices, the speed calculation is carried out programmatically.

 The proposed method allows to exclude the measurement error caused by slipping wire in the feed mechanism, due to the fact that information about the speed of movement of the wire is taken directly from the measurement object. Since the number of pulses per unit time is determined by the size of the roller (10), when switching to another type of feed mechanism, there is no need to determine the dependence of the number of pulses per unit time on the diameter of the rollers of the feed mechanism.

Literature
1. Sergatsky G.I., Blinov V.I., Alisov S.N., Shangin A.N., Rossoshinsky D.A., Kovalchuk-Khimyuk L.A. Automatic welding, 1990, 5, p. 58-63.

 2. Korotinsky A.E., Kisilevsky Y. F., Mukhlygin N. S., Terekhov V. M. The choice of the structural scheme and technical means of collecting information in arc welding / Automatic welding, 1984, 10, p. 59-61.

Claims (1)

 A method of measuring the feed speed of the electrode wire, in which the measurement is carried out using a sensor made on the basis of a photoelectric converter, characterized in that when the electrode wire is supplied from the coil to the feeding mechanism, it is passed through a sensor, the sensitive element of which is frictionally connected to the electrode wire in the area between the coil and rollers of the feed mechanism, while the translational movement of the electrode wire is converted into electrical pulses, the repetition rate of which s is proportional to the wire speed.

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