JP2007275975A - Welding truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a welding truck having a function by which welding operation can be stopped and travelling speed can be controlled in a target welding truck, in a noncontact state from a distance by means of an optical sensor having directivity on a light receiving end, and by which conventional problems of a welding truck are solved. <P>SOLUTION: The welding truck 100 is equipped with a light receiver for an optical sensor by providing an opening in a control box 8 installed in or on the truck body 1 and making the light receiver face the opening, and is equipped with a means for cutting off a welding power source 300 by a cut-off signal from the light receiver. In addition, the welding truck 100 is equipped with a means for adjusting the travelling speed of the welding truck 100 by a speed adjusting signal from the light receiver, and is also equipped with a light projector 14 for projecting through the opening the cut-off optical signal and the adjusting optical signal to the light receiver of the optical sensor from a position away from the truck. Furthermore, the light receiver of the optical sensor is arranged while the distance from the opening is made movably adjustable. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a welding carriage, and more particularly, to a welding carriage capable of controlling a welding operation and a traveling operation in a non-contact manner from a remote position by a remote control.

  In the construction of ships and other structures, welding carts such as simple automatic fillet welders that move at high speed and obtain high welding efficiency are used. This welding cart has a slider that slides in a direction perpendicular to the width direction of the cart body on the cart body that automatically travels, and a torch holder is attached to the slider so as to be able to rotate in the vertical direction. The torch is configured to be held (see, for example, Patent Document 1).

Since it is such a configuration, fillet welding can be continuously performed by adjusting the position of the slider and the angle of the torch holder so that the welding torch is held in an optimum posture and the carriage main body travels.
Also, at the welding site, one worker is often handling multiple welding carts set at intervals at the same time. In this case, however, the operator is responsible for stopping the welding cart due to malfunction. We monitor with great care whether there is any welding failure such as over-welding, insufficient leg length due to subtle changes in running speed caused by external conditions, and excessive leg length.

If for some reason the carriage body does not run and welding continues while remaining in the same position, excessive welding will occur, but this excessive welding will be a waste of material resources, and the overwelded part must be repaired manually. Therefore, an extra repair process occurs. In addition, the heat load may remain and the quality of the product may deteriorate. Further, extra welding fumes are generated, which leads to environmental pollution.
For this reason, if excessive welding occurs, the welding carriage must be immediately stopped.

  In addition, when the traveling speed of the welding carriage changes due to traveling load, etc., welding is performed at a constant output, so when the traveling speed increases, the weld leg length decreases, and when the traveling speed decreases, the weld leg length increases. In this case, since a poor welding state occurs, it must be returned to a predetermined traveling speed so as to obtain a normal weld leg length.

A control box is installed in the welding cart, and a push button type welding stop button is provided on the control box, so in order to stop the welding cart where excessive welding has occurred, the position of the welding cart is required. At present, the welding is stopped by pressing the welding stop button.
Further, the control box is provided with a speed adjustment knob for adjusting the traveling speed of the welding carriage. When the traveling speed of the welding carriage changes, in order to obtain a normal welding leg length, Similarly, it goes to the position of the welding carriage, and the traveling speed of the welding carriage is adjusted by turning the speed adjustment knob provided in the control box.

  These operations are carried out in a groping state with a light shielding hood mask while exposed to strong arc light, and the stop button and adjustment knob are provided on the control box located below the welding torch. In addition, the work was performed in a very narrow place, and the work was performed at a short distance from the welding torch in the state where the arc was generated, which was dangerous.

JP 2001-212670 A (second page, FIG. 2)

  The present invention solves the problems as described above, and stops the welding of the target welding carriage in a non-contact manner from a remote position using an optical sensor having directivity in the light receiver. An object of the present invention is to obtain a welding carriage having a function of controlling traveling speed.

  A welding trolley comprising an opening in a trolley main body or a control box installed on the trolley main body, a light sensor receiver installed in the opening facing the opening, and a cut-off signal from the light sensor receiver Means for shutting off the welding power source, and a projector for projecting a light signal for shutting off to the light receiver of the optical sensor through an opening provided in the cart body or a control box installed on the cart body.

  In addition, a means for adjusting the traveling speed of the carriage main body by an adjustment signal from the light receiver of the light sensor is provided, and a light projector for projecting the adjustment light signal to the light receiver of the light sensor. It is also characterized in that the light receiver of the optical sensor is installed so as to be adjustable, the cover having a window that transmits light is covered with the opening, and the aperture is provided with a diaphragm function.

  Since the welding of the target welding cart can be controlled without contact by the optical sensor, when over-welding occurs, the operator sends a blocking light signal to the welding cart where over-welding occurs from a remote location. Light can stop welding. In addition, even when welding failure such as insufficient leg length or excessive leg length occurs, the traveling speed of the welding carriage can be controlled so as to obtain a normal leg length in a non-contact manner by projecting an adjustment optical signal. Because the light receiver of the optical sensor has directivity, even when dealing with multiple welding carts, the same signal is used to control the welding of the welding cart without interfering with other welding carts. be able to.

  The best mode of the present invention shown in the drawings will be described below. FIG. 1 is a diagram showing an outline of a welding carriage and a welding power source according to the present invention. 2 is a plan view inside the control box, FIG. 3 is a front view inside the control box, and FIG. 4 is a side view of the control box. FIG. 5 is a front view of the opening cover of the control box, FIG. 6 is an explanatory view showing a light receiving area of the optical sensor, FIG. 7 is a schematic view of a traveling control panel of the cart body, and FIG. 8 is a schematic view of a projector.

First, an outline of automatic fillet welding will be described with reference to FIG. The welding carriage 100 includes a carriage main body 1 having traveling wheels 6 that automatically travels, and a slider 2 that is mounted on the carriage main body 1 and slides in the width direction of the carriage main body 1. A torch holder 3 is rotatably attached to the torch holder 3, and a welding torch 4 is held on the torch holder 3.
Reference numeral 5 denotes a torch cable connected to the torch 4, and reference numeral 7 denotes a copying roller for causing the carriage main body 1 to follow the material to be welded.

The torch cable 5 is connected to the core wire supply device 200 and receives the supply of the core wire which is a molten material, and via the core wire supply device 200, the welding power source is supplied from the welding power source 300, and the gas cylinder 400 is used to shield the welded portion. The supply of carbon dioxide gas.
Then, the corners of the materials to be welded a and b are continuously welded while running following the material to be welded b placed on the material to be welded a and temporarily fixed to the material to be welded a. I will do it.

  A control box 8 is installed on the cart body 1, and an opening 9 is provided on the side surface of the control box 8. The opening 9 is covered with an opening cover 10 having a light transmissive window 24 such as an acrylic resin plate to prevent dust from entering the control box 8 through the opening 9.

  A light receiver 11 of an optical sensor is disposed in the control box 8 so as to face the opening 9 so that the distance from the opening 9 can be adjusted and moved. For example, the light receiver 11 is bolted to a mounting base 12 installed in the control box 8 and having a plurality of mounting holes drilled. The distance from the opening 9 can be adjusted by selecting the mounting hole.

As shown in FIG. 5, the opening cover 10 of the opening 9 is prepared with a plurality of windows 24 having different sizes of the window 24, and the size of the opening 9 is changed by replacing the opening cover 10. be able to.
The control box 8 is provided with a relay circuit 13 which is a means for shutting off the welding power source when a light signal for interruption is inputted to the light receiver 11. The relay circuit 13 includes a capacitor that amplifies a weak current from the light receiver 11, a resistor, and a switch that cuts off the welding power source of the welding carriage 100.

  A projector 14 (see FIG. 8) to the light receiver 11 carried by an operator who handles a plurality of welding carts 100 uses an infrared signal that emits one wavelength signal. That is, when a plurality of welding carts 100 are handled, only one stop button 15 is operated so that it is not necessary to select the machine number of the welding cart 100.

  For this reason, attachment setting of the light receiver 11 is made corresponding to the welding site so that infrared signals do not interfere with the plurality of welding carts 100. For example, the mounting position of the light receiver 11 is set according to the arrangement interval of the plurality of welding carts 100.

Although FIG. 6 shows the light receiving area of the light receiver 11, it must be arranged so that the adjacent light receiver 11 </ b> B does not receive at least the infrared light projected toward the predetermined light receiver 11 </ b> A. For this reason, the distance L from the opening part 9 is adjusted, and the bolt fixing position to the mounting base 12 of the light receiver 11 is determined.
It should be noted that long holes may be provided in place of the plurality of mounting holes drilled in the mounting base 12. Further, a mounting base 12 having a guide rail may be provided, and the light receiver 11 may be slid along the guide rail and clamped at a predetermined position for adjustment movement.

Further, as shown in FIGS. 5A, 5B, 5C, and 5D, an opening cover 10 having a different size of the window 24 provided in the center is provided, and the opening cover 10 is selectively used. The light receiving area can be limited by changing the size of the opening 9.
In addition, the window of the opening cover 10 is not limited to a circular shape, and may be an oval shape that is long in the vertical direction. In this case, infrared rays can be received through a large opening in the vertical direction while limiting the light receiving area in the horizontal direction, so that even if the aim of the projector 14 is slightly shifted in the vertical direction, light can be received effectively.

  FIG. 7 shows a traveling control panel 17 of the carriage main body 1 provided on the welding carriage 100 or the control box 8. A travel button 18 and a travel stop button 19 are provided on the board surface. Further, since the cart body 1 travels rightward (forward) or leftward (reverse) depending on the welding conditions, the changeover switch 20 is provided.

  The control box 8 includes means for adjusting the traveling speed of the carriage main body 1 composed of a capacitor and a resistor for amplifying the weak current from the light receiver 11 and a sequence for adjusting the current supplied to the traveling motor of the carriage main body 1. (Not shown) is provided, and the traveling speed of the carriage body 1 is controlled in response to an adjustment signal from the light receiver 11.

The travel control panel 17 is provided with a rotary switch 21 which is a speed adjustment knob for manually adjusting the travel speed adjusting means, and can be adjusted manually.
The projector 14 is provided with a speed adjustment button 16 for projecting an adjustment optical signal. The speed adjustment button 16 generates a signal for increasing the traveling speed and a signal for decreasing the traveling speed. This speed adjusting optical signal is obtained by, for example, placing a digital signal shaped on the plus side and the minus side on an infrared carrier wave. Lighted.

  Light emitting diodes 22 are arranged on the surface of the travel control panel 17 and around the rotary switch 21. Each time the speed adjustment light signal is emitted from the speed adjustment button 16, the light is emitted to the plus side or the minus side to travel. The speed adjustment status can be recognized. Further, a light emitting diode 23 is provided on the surface of the traveling control panel 17, and the traveling speed at that time is indicated in a zone (low speed, medium speed, high speed).

  A digital numerical display can be used in place of the light emitting diode 22, and a variable resistor is used in place of the rotary switch 21, and an AD converter is provided to convert the resistance value from analog to digital. It is also possible to use a speed adjusting means for controlling.

  In the above embodiment, the configuration in which the opening 9 is provided in the control box 8 provided on the cart main body 1 has been described. However, the control device may be arranged in the cart main body 1 as it is. At this time, the opening 9 is provided on the side surface of the cart body 1, and the light receiver 11 and the relay circuit 13 are installed in the cart body 1. The control box 8 also contains a device for adjusting the traveling speed of the carriage body 1, but is not shown.

Moreover, although the opening part 9 was provided in the side surface of the trolley | bogie main body 1 or the control box 8 installed on the trolley | bogie main body 1, and the light receiver 11 was arrange | positioned facing this opening part 9, the trolley | bogie main body 1 or control It is also possible to provide an opening 9 on the rear surface of the box 8 (with respect to the traveling direction of the carriage 1), and to provide a light receiver 11 facing the opening 9.
Furthermore, in order to change the size of the opening 9, the cover 10 having the window 24 of a different size is used. However, the plate piece that partially closes the opening 9 may be stopped and squeezed, or the opening A plurality of plate pieces may be overlapped with each other along the outline of 9 and provided so as to be rotatable. For example, the area of the opening 9 may be changed like a shutter of a camera. In this case, for example, a cover such as an acrylic plate is preferably attached to the opening 9 in order to prevent dust from entering.

  In the present invention, the light receiver 11 of the optical sensor has directivity. Therefore, when excessive welding is found during continuous welding, the operator pushes the stop button 15 of the projector 14 toward the opening 9 of the welding carriage 100 from the approximate side or rear of the welding carriage 100 to shut off. The welding is stopped by projecting an optical signal. In addition, when a poor welding state due to insufficient leg length or excessive leg length is found, the operator pushes the speed adjustment button 16 of the projector 14 toward the opening 9 of the welding carriage 100 to project an adjustment optical signal. Thus, the traveling speed of the cart body 1 is adjusted.

  For example, when the speed adjustment button 16 is pressed on the speed increasing side or the speed decreasing side, the light emitting diode 22 is sequentially turned clockwise or counterclockwise to recognize the adjustment state. The Further, for example, when the speed adjustment button 16 is continuously pressed for 1 second or more, the light emitting diodes 22 are continuously lit continuously at a constant speed. When the speed is rapidly increased or decreased. Convenient to. Further, the light emitting diode 23 is lit to indicate the current traveling speed zone (low speed, medium speed, high speed) of the main body 1.

  And after removing the cause of the excessive welding of the said welding trolley | bogie 100, it resets and supplies power and restarts continuous welding. When the speed is adjusted and a normal weld leg length is obtained, the speed is maintained and welding is continued.

  As described above, when excessive welding occurs, the welding of the welding carriage 100 can be stopped in a non-contact manner from the position separated by the light receiver 11 of the optical sensor, and a poor welding state due to insufficient leg length or excessive leg length occurs. In this case, the traveling speed of the cart body 1 can be adjusted without contact from a position away by the light receiver 11 of the optical sensor, and these operations can be performed in a safe state.

The figure which shows the outline | summary of the welding trolley | bogie and welding power supply by this invention. The top view in a control box. The front view in a control box. The side view of a control box. The front view of the opening cover of a control box. Explanatory drawing which shows the light-receiving area | region of a photosensor. Schematic of the traveling control panel of the cart body. Schematic of a projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carriage body 2 Slider 3 Torch holder 4 Welding torch 5 Torch cable 6 Traveling wheel 7 Follow roller 8 Control box 9 Opening part 10 Opening cover 11 Light receiver 12 Mounting base 13 Relay circuit 14 Light projector 15 Stop button 16 Speed adjustment button 17 Travel control Panel 18 Travel button 19 Travel stop button 20 Changeover switch 21 Speed adjustment knob 22 Light-emitting diode 23 Light-emitting diode 24 Window 100 Welding carriage 200 Core wire feeder 300 Welding power supply 400 Gas cylinder

Claims (8)

  An opening is provided in the main body of the carriage or a control box installed on the main body of the carriage, a light sensor receiver is installed facing the opening, and the welding power source is shut off by a cutoff signal from the light sensor receiver. A welding carriage characterized by comprising means, and a light projector for projecting an optical signal for interruption to the light receiver of the optical sensor through the opening.   An opening is provided in the main body of the carriage or a control box installed on the main body of the carriage, a light receiver of the optical sensor is installed facing the opening, and the traveling speed of the main body of the carriage is determined by an adjustment signal from the optical sensor receiver. And a light projector for projecting an optical signal for adjustment to the light receiver of the optical sensor through the opening.   The welding carriage according to claim 1 or 2, wherein a cover having a window that transmits light is covered with an opening.   3. The welding carriage according to claim 1, wherein the light receiver of the optical sensor is disposed so that the distance from the opening can be adjusted and moved.   The welding carriage according to claim 4, wherein a plurality of attachment holes or long holes are provided in the attachment base to attach the light receiver of the optical sensor.   The welding carriage according to claim 1 or 2, wherein the opening has a throttle function.   The welding cart according to claim 6, wherein the size of the opening can be changed by changing an opening cover having windows of different sizes. The welding cart according to claim 1, wherein an infrared sensor is used as the optical sensor.

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