JPS5881573A - Method for taking out wire for welding - Google Patents

Abstract

PURPOSE:To detect the time of completion of taking out of a wire from the pail pack by detecting a mark put on the terminal of the wire using a mark detector provided on the wire taking out passage. CONSTITUTION:A mark M is put on a position located at a certain length before the terminal of a wire, and a mark detecting device 14 is installed. The wire W is pulled out from inside of a pail pack, passed through a guide chip 17 of the central opening of a cover member 7, and fed to a weld zone through the guide of a device 14 attached to the upper side of the opening, pressing rollers 19, 20, a guide chip 18 etc. A mark detector 15 is installed on the passage for taking out wire which is protected from deviation. When the mark M placed on the wire passes the operating limit of the detector 15, the detector detects this and generates output, and for instance, lights up a warning lamp or sounds a buzzer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for taking out welding wire, especially a solid wire loaded in a pail pack, a slack wire, a seamed wire with welded seams, or a seamless wire without a seam. The present invention relates to a method for detecting the end time of taking out the welding wire in advance before the welding wire in the pail pack is used up when the welding wire is taken out and used.

Generally, a pail pack having an inner cylinder and an outer cylinder, or only an outer cylinder without an inner cylinder is used as a storage container for a large capacity welding wire. In this case, as explained in Figure 1, the height of the pale pack 1 itself is usually about 80 kg for a unit weight of 200 kf.
011II11, it is tall, and when in use, the conical lid member 7 is attached to the upper end of the outer tube 2 of the pale pack with a fastening band 8, so the height is even greater, and the inner tube 3 is installed inside the pale pack. Even if the lid member 7 is made of a transparent material, it is very difficult to check the remaining amount of welding wire W in the pail pack and estimate when to replace it with the next new pail pack. It is difficult to do this, and it is easy to realize that the pail pack is empty and replace it only after the welding wire in the pail pack runs out and the arc stops. In Fig. 1, 4 is a holding plate for the welding wire coil 5, 6 is a guide ring, 9 is a conduit cable, 10 is a wire feeder, 11 is a welding torch, 12 is a welding member, and 13 is a fully automatic welding robot. be.

Especially in recent years, when welding work has become increasingly automated and all welding work is carried out fully automatically and unattended using welding robots, etc.
If welding work is interrupted due to running out of welding wire, it is time consuming to replace the pail pack, pass the welding wire through the conduit cable and torch, and restart the arc, which is preferable as it reduces work efficiency. do not have. Further, it is not preferable to interrupt and restart the welding process halfway through the welding process in order to obtain a good welded part. In order to completely prevent this, it is desirable to develop a method that can detect when all the welding wire is used up.

The inventors of the present invention have marked one or more force points (for example, by adding color) at a predetermined distance from the winding start end (which becomes the final end during welding) when winding the welding wire into the pail pack.
It has been found that the welding wire termination timing can be accurately detected by attaching a mark, detecting this mark with a detection device provided on the upper part of the lid member 7, and generating a mark detection signal.

Examples will be explained below based on FIG. 2. However, the following examples are not intended to limit the present invention, and various examples can be considered as appropriate without departing from the gist of the present invention.

In the present invention, a mark is placed, for example, 1 to 20 meters before the end of the welding wire, and the detection device 1 detects all the marks.
4 will be provided. FIG. 2(a) is a detailed diagram of the detection device 14, and FIG. 2(b) is a block diagram showing the operation of the detection device. The entire detection device 14 is attached with bolts and nuts 22 to the upper surface side of the central opening of the lid member 7 attached to the pale pack outer cylinder 2 in FIG. The welding wire is pulled out from inside the pail pack, passes through the guide chip 17 attached to the central opening, and a detector is installed to prevent the welding wire from falling out of the response range of the detector 15. The guide chip 18, which also serves as a mounting bracket for the conduit cable 9, is sandwiched between a V-grooved guide roller 19 for fully determining the position of the welding wire attached to the upper and lower parts of the welding wire 15, and a presser roller 20. The wire is sent to the wire feeding device 10 shown in FIG. 27 is a cup-shaped nut member that surrounds the end 9ai of the enlarged conduit cable 9, is screwed into a thread groove carved around the guide chip 18, and holds the end 9ai in close contact with the guide chip 18. .

The pressing roller 20 always presses the wire W against the guide roller 19 by the spring 21.

These metal fittings support the 16 detectors 15, all of which are attached to the frame 23. ! detection device 14
The entire structure is covered with a removable cover (not shown) to avoid disturbances.

Now, when the welding wire in the pail pack is consumed and the mark M marked on the welding wire passes through the response range of the detector 15, the detector detects all the marks 7 and produces an output, which is shown in Figure 2. After being amplified by the detector amplifier 24 in (b), the signal is sent to the control section 25, and a built-in or no-contact point or the like is operated in the control section 25, and a signal is emitted to the outside of the control section. This signal causes a desired action such as turning on all warning lights, sounding a buzzer, or sending a signal to an external device 26 such as a welding machine or robot controller to stop the welding operation as soon as a predetermined length of welding is completed or immediately. can be made to do so. The following is the second stage of fully automatic welding work using a welding robot.
An example in which termination was actually detected using all of the detection devices shown in the figure will be described.

Example 1゜A solid wire of 1.2Wφ was used as the welding wire, and 20m (A) and 1m (B) from the final end of the welding wire were used.
, wire feeding stop) was oxidized black by passing a current through it over the length of about 50 cylinders. A diffuse reflection type phototube was used as the detector 15. When welding was carried out using this method, the detection device reliably detected the oxidized portion (A) ffi. When this mark was detected, a warning light was turned on, and welding continued until a predetermined length of welding was completed and the wire feeding was stopped at the welding point. At this time, the final end of the wire remained protruding from the lid 7 by about 3 m.

Example 2 A 7-lux shear wire with a diameter of 1.6 mm was used as a welding wire, and magnetized over a distance of about 30 mm at 1 sm (A) and 1 m (B, for stopping wire feeding) from the final end. .

A magnetic detection head was used as a detector. When all welding was carried out using this method, the detection device reliably detected the magnetized part (A).
'? This caused the shipper to chime, continue welding, and completely stop feeding the wire when the predetermined length of welding was completed. At this time, the final end of the wire protruded 5 m from the lid 7 and remained inside the pail pack.

Example 3゜ Seamless wire with a diameter of 1.2 mm was used as a welding wire. From 1 to the final end, a length of about 30 minutes was applied with 14rn (A) and 1m (B, for stopping the wire feeding) of Shinton fluorescent paint. It was applied all over. A diffuse reflection phototube was used as a detector.

When all welding was carried out using this method, the detection device reliably detected the applied part (A)'. This will cause the buzzer to sound
As welding continued, the detection device detected the entire coated area (B) and completely stopped wire feeding.

At this time, the final end of the wire remained inside the pail pack, protruding 1 m from the lid.

In all of these examples, the entire mark was reliably detected, and the end of the wire was detected when a suitable length of the welding wire remained inside the pail pack. When all the welding wire in the pail pack is used up, it is replaced with a new pail pack. In this case, in the present invention, the lid member 7 is simply removed from the used pail pack, the lid of the new pail pack is removed, and the wire tip metal is taken out from inside. Welding can be restarted simply by welding the wire tip protruding from the lid member 7 to the wire tip of the new pail pack, and then attaching the lid member Z to the upper opening of the new pail pack. In this regard, with the conventional method, in the worst case scenario, the wire passes through the feeding device 10 and cannot be fed, welding stops, and the wire breaks. , the wire feeding device 10, the welding torch 11, etc., and if it is an automatic welding device, welding must be started again after seven strokes, which is extremely troublesome.

As explained above, according to the present invention, since the wire end detection sound is generated and all the signals are issued, it is possible to greatly reduce the hindrance to welding work, and its usefulness is extremely large. Note that the mark is not limited to one place, but can be placed in several places at appropriate intervals, so that, for example, the amount of welding wire used can be grasped with the same detection device.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of welding using welding wire in a pail pack, Figure 2 (,) is a plan view of the wire end detection device, and Figure (b) is a block of the electric circuit section of the detection device. It is a diagram. 1... Pail pack, 2... Outer cylinder, 3... Inner cylinder,
4... Holding plate, 5... Welding wire, 6 River guide ring, 7... Lid member, 8... Fastening band, 9...
Conduit tube, 10...Wire feeding device, 11
... Welding torch, 12... Welding member, 13... Fully automatic welding robot, 14... Detection device, 15... Detector, 17.18... Guide chip, 19... Guide Roller, 2o--pressing roller. Applicant Nippon Steel Welding Industry Co., Ltd.

Claims (1)

[Claims] A method for taking out welding wire from a pail pack that stores welding wire in a loop, using a welding wire with all detection marks on the terminal end, and a mark provided on the wire removal path. A method for taking out a welding wire, characterized in that the time at which the welding wire is finished being taken out from a pail pack is completely detected by detecting the mark while the welding wire is being taken out by a detector.