JPS5932457Y2 - Welding trolley - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a weld line contact type profiling sensor that is capable of detecting when the profiling member at the tip of the sensor is deviated from the lap joint weld line.

Conventionally, it has been known to attach a welding line contact type tracing sensor to a welding carriage and perform tracing welding.

In this case, tack welding is generally performed at appropriate locations on the weld line, and if the tracing member of the sensor rides on the tack welded part and comes off the weld line, the casing 5 and The position of the welding point of the torch attached to the traveling truck also deviates from the welding line, making accurate welding impossible.

This invention was developed in view of the above-mentioned circumstances, and the object is to provide a sensor capable of detecting if the tracing member of the sensor becomes detached from the lap joint weld line.

Embodiments of this invention will be described in detail below based on the drawings.

In the embodiment, a case will be described in which the weld line contact type profiling sensor detects only the left and right directions, but the invention is not limited to this embodiment.

1... It is a traveling trolley for welding.

2: Two rear wheels of the truck 1, whose shaft 3 is driven by a motor 4 via a gear reduction mechanism 5.

6... A front wheel of the truck 1, and a pivot shaft 8 connected to its shaft 7 is driven by a motor 9 via a gear transmission mechanism 10.

T: This is a torch that is placed on the rear side of the truck 1 in a downward facing position, and its angle and position can be adjusted, although the details are not shown.

Note that it is desirable that the welding point of the torch T be aligned with a straight line X connecting both contact points of the two rear wheels 2 with a workpiece P1 to be described later.

Further, the torch T is connected to an L welding machine (not shown).

S: A weld line contact type profiling sensor attached to the trolley 1.

11... This is the main body of the sensor S.

In this embodiment, the main body 11 is fixed to an arm 13 located in front of the torch T and pivoted by a horizontal shaft 12 projecting to the side of the truck 1.

That is, the main body 1 is vertically movable relative to the shaft 121 and is urged downward by gravity.

14...Supported by the main body 11 so as to be slidable left and right,
This is a moving member that is biased to one side (to the left in FIG. 3) by a compression spring 15.

14a is a sliding shaft in the left-right direction that is integral with the member 14.

14b is a roller that is rotatably attached to the member 14 about a vertical axis.

Reference numeral 14c denotes an effecting body provided integrally with the member 14, which is a protrusion in the embodiment.

16... A balance arm rotatably connected to the tip of the sliding shaft 148.

17 is a tracing member supported at both ends of the balance arm 160, and in the embodiment is a guide roller rotatably supported by a shaft 18 in the left-right direction and pivoted so that its rotational plane is the same.

Ll is the collar of both guide ports 217 and the workpiece P to be welded, which will be described later.
2 is the distance between the inner ends of the contact portion, and L2 is the distance between the outer ends.

19... Normal displacement detection means (potentiometer in the embodiment) of the sensor S, which is attached to the main body 11 and is capable of detecting the position of the member 14.

An operating piece 20 is fixed to the shaft 198 of the potentiometer 19, and the tip of the operating piece 20 is configured to come into contact with the roller 14b and press the roller 14b by a tension spring 21 applied between it and the main body 11. .

22 - Abnormal displacement detection means attached to the main body 11 and activated by the effecting body 14c when the member 14 rises to the spring 15 and is located near the one (left) sliding end. (a microswitch in the embodiment).

By operating the switch 22, the functions of the truck 1 including the welding machine (not shown) are stopped.

P1sP2... All are objects to be welded (iron plates).

WL: A corner weld line formed by overlapping the objects P1 and P2 to be welded.

M.--This is a tack welded portion applied to several parts of the weld line WL.

L3 is the length of the tack welded portion M.

L4 is the distance between the adjacent tack welded portion M.

Then, the length L3 of the tack welded portion M is shorter than the distance L1, and the distance L4 is longer than the distance L2.
Tack welding is performed.

Further, the operation of this embodiment will be explained.

1. As shown in Figures 1 and 2, the carriage 1 is moved to the workpiece P2 so that the rotating surfaces of both guide rollers 170 are in contact with the upper surface of the workpiece P2, and their ribs are in contact with the side surface of the workpiece P2. P1
Place it on top.

Next, adjust the angle of the torch T to an angle suitable for fillet welding, and align the welding point of the torch T with the straight line X connecting both the contact points of the rear wheel 2 and the workpiece P1, In addition, the potentiometer 19 is adjusted so that it is located behind the position of the guide roller 17 at the position of the member 14 that is in the neutral position.

Automatic profile welding is then started, that is, the welding machine (not shown) is operated while driving the motor 4 and moving the cart 1 forward at a constant speed.

If the welding line WL is slightly slanted from side to side, the guide roller 17 is pushed along the welding line WL, so the member 1
4 moves left and right, and potentiometer 1 moves accordingly.
9 is also displaced from the neutral position.

Then, in relation to the direction and amount of this displacement, the motor 9
is controlled, the direction and turning angle of the front wheels 6 are changed,
Eventually, the carriage 1 is steered such that the potentiometer 19 maintains said neutral position, ie, in such a way that the member 14 is maintained almost in a fixed position relative to the force input body 11.

Therefore, even if the welding line WL is slightly slanted from side to side as described above, the welding point of the torch T is mostly located at the rear of the rotating surface of the guide roller 17 and along the welding line WL. become.

Furthermore, if the weld line WL is slightly slanted vertically, the guide roller 17 is moved along the weld line WL because the balance arm 16 is rotatable and the main body 11 is rotatable relative to the horizontal shaft 121. be sure to follow.

Furthermore, even if the guide roller 17 comes into contact with the tack welding part M,
The length L3 of the tack welded portion M is shorter than the distance L1, and the distance L3 is shorter than the distance L1.
4 is longer than the distance L2. Since tack welding is applied to 1, both guide rollers 17 will not ride on the tack welded part M at the same time, and the guide roller 17 will be able to move along the weld line W.
It never deviates from L.

If both guide rollers 17 should come off the weld line WL, the member 14 will be pushed to one side by the force of the spring 15, so the effecting body 14c will come into contact with the switch 22,
The output signal of this switch 22 causes the motor 4 to stop.
That is, the truck 1 stops, and at the same time, the welding machine (not shown) also stops its operation, and all of its functions stop.

Therefore, at the same time, for example, if an alarm device is activated, the operator can detect the abnormality by the alarm and bring the guide roller 11 of the sensor S into contact with the welding line WL again, and start welding in the same manner as described above. stomach.

The above description is an example, and for example, the main body 11 may be pressed against the running surface by a spring.

The housing effecting body 14o may be, for example, a permanent magnet or a light emitting diode, and correspondingly the sensing means 22 may be a reed switch or a phototransistor.

Furthermore, the effecting body 14c is provided on the main body 11 side, and the detection means 2
2 may be provided on the member 14.

It goes without saying that the technical scope of this invention also includes the replacement of other components with equivalents.

As described above, in this invention, in the event that the tracing member IT deviates from the lap joint weld line WL, the detection means 22 becomes active and an abnormality can be detected.

Therefore, if the welding machine and the trolley 1 are stopped based on the output signal of the detection means 22, not only will random welding not be performed, but the moving member 14 and the tracing member 17 will be able to control the welding line due to their movements. In addition to following the welding line, it is possible to detect an abnormality based on movement caused by deviation from the weld line, so there is no need to provide separate members for tracing and abnormality detection.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway view showing an embodiment of this invention, Fig. 2 is a side view of the embodiment of Fig. 1, and Fig. 3 is the main part of the weld line contact type profiling sensor of this embodiment. It is an explanatory diagram. In the figure, 1... Welding traveling trolley, S...
...Weld line contact type profiling sensor, 11...Sensor body, 14...Moving member, 14c...
...Action body, 15... Spring, 16...
Balance arm, 11... Tracing member (guide roller),
18... Axis, 19... Ordinary displacement detection means, 22... Abnormal displacement detection means.

Claims (1)

[Scope of utility model registration request] The guide roller consists of a sensor body that is vertically movable and biased downward, a moving member that is supported by the body so as to be slidable left and right and biased in one direction by a spring, and two guide rollers. The spacing is longer than the length of the tack welding portion and shorter than the spacing between adjacent tack welding portions; , a lap joint weld line contact type tracing sensor including a normal displacement detection means for detecting the sliding position of the moving member, wherein an effecting body is provided on one of the moving member or the main body, and the other body is provided with an effecting body; Alternatively, the movable member is provided with abnormal displacement detection means that is activated by the action body when the movable member is positioned near the one sliding end by the spring.
The weld line contact type profiling sensor.