JPS6226296Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotation unevenness prevention mechanism for the magnetic roller of a bogie that carries a welding device, etc. This is configured as a magnetic roller type motor using magnets, and is designed to eliminate unevenness in running speed and to make the starting timing and stopping position accurate.

The running cart of automatic welding equipment may be one that runs along a pre-installed guide rail or pedestal, or one that is placed directly on the base material and follows the base material or a guide member provided on the base material. Traveling trolleys are often used. In particular, for traveling bogies in which a vertical plate is erected on top of a horizontal plate and fillet welding is performed over a long distance along this plate, the horizontal plate and vertical plate (these are inclined to form a V-shaped downward weld line) are used. (including cases in which it is formed) is used as a gravity-supported traveling platform or a traveling guide plate. In particular, the latter type of traveling bogie has driving wheels that actively rotate (hereinafter referred to as drive wheels) and guide wheels that regulate the running direction of the truck (hereinafter referred to as guide wheels).
However, depending on the shape of the base material, degree of inclination, welding posture, etc., the drive wheel may not always be placed on the horizontal plate side, but may be placed on the vertical plate side. . Furthermore, these guide wheels and drive wheels use magnetic rollers made of permanent magnet material, and rotate while being attracted to the guide side plate to guide the traveling of the bogie, or while being attracted to the running side plate and rotate. Its role is to increase contact pressure and reliably maintain running speed.

For example, FIG. 1 is a partially cutaway plan view showing a conventional example of a traveling bogie configured in this manner, and FIG. 2 is a front view, in which the traveling bogie 1 is placed on a horizontal plate 2 and stands on the horizontal plate 2. This figure shows what is applied to fillet welding with the vertical plate 3 to be installed. That is, the traveling carriage 1 is constructed so as to mount a welding device on its top side, and is also provided with a pair of guide and drive wheels 4, 4a and a pair of running wheels 5, 5a, each of which is constituted by a magnetic roller. The guide drive wheels 4, 4a are actively rotated by the drive shaft to cause the traveling carriage 1 to travel. The traveling truck 1 is shown traveling in the direction of arrow P, and the guide drive wheels 4,
4a rotates while adhering to the vertical plate 3, and the trolley 1 travels along it.

By the way, since magnet rollers are generally composed of permanent magnets, there are many variations in magnetic force in the circumferential direction, and when the present inventors measured the attraction force (magnetic force) of the magnet roller as an example, the results are shown in Figure 3. The attraction force of each part of the magnet roller 4b is 50Kg at point A, 55Kg at point B, 50Kg at point C,
It weighed 51kg at point D. That is, as shown in the figure, when the magnetic roller 4b is rolled in the direction of arrow Q from a state where the point A is in contact with the steel plate 2a, the adsorption force is greater at point B, so the magnetic roller 4b rolls lightly from A to B, but B
From C to C, since C has a smaller magnetic force,
It will not rotate unless you apply a certain amount of force. This change in the force required for rotation means that there are parts that roll naturally with almost no external force applied, and parts that roll only with a certain amount of external force.
This means that the resistance to rolling is uneven, which causes the following disadvantages. That is, in carts that use magnetic rollers as running wheels, uneven drive torque occurs, but generally the running wheels are driven via a chain or many gears, so there is a large bump in the drive power transmission system, which causes play. The magnet roller idles, and this appears as uneven running due to movement resistance. Also, when stopping or starting, there is a delay in rotation due to this amount of play, and especially when starting, the traveling magnetic roller may not move until the play is recovered, and when stopping, the stopping position may not be accurate due to the influence of inertia. The disadvantage is that it does not.

The present invention was developed in view of this situation, and aims to alleviate the running unevenness of various types of bogies that use magnetic rollers made of permanent magnets for driving or guiding wheels. Specifically, it is an attempt to provide a magnet roller with no uneven rotational torque. That is, the gist is that the brake shoe is always pressed against the magnet roller or its rotating shaft so that variations in the magnetic force of the roller are absorbed by the pressing of the brake shoe to eliminate uneven running.

The present invention will be explained below based on the drawings, but the drawings show an example of a specific implementation of the present invention, and the present invention is not limited to these illustrated examples. The same implementation is possible even if the design is changed or a part of the design is changed.

Fig. 4 (partially cutaway plan view) and Fig. 5 (front view of Fig. 4) illustrate a cart 1a to which the magnetic roller of the present invention is applied, and a welding device is mounted on the top side. is the same as the conventional example. Also, like the conventional example, the bogie 1a has a pair of guide and drive wheels 4, 4a, a pair of running wheels 5,
Drive wheels 4, 4a are provided as a pair of drive wheels 5a, each of which is composed of a magnetic roller. They are driven via sprockets fixed to their respective shafts. The chain 7 also rotates while being guided by free rotation sprockets 8, 8, 8. In order to maintain the tension of the chain 7, a presser foot free rotation sprocket 9 is provided.

In the present invention, in the guide drive wheel 4 of the bogie 1a, a brake shoe is pressed directly against the side surface of the drive wheel 4 by the elastic force of a spring, or the brake shoe is pressed against the rotating shaft of the drive wheel 4, This is intended to alleviate and eliminate uneven rotation of the magnet roller, ie, uneven running of the welding traveling carriage 1a, as described above. That is, FIG. 6 is an enlarged explanatory view of the essential parts of an embodiment of the braking device 10 that presses the brake shoe 15 directly against the side surface of the magnet roller 4. As shown in FIG. In the device of this embodiment, a brake shoe 15 is attached to the tip of a presser rod 14 attached to a frame portion 13 that supports the shaft 11 of the magnet roller 4, and the brake shoe 15 is operated by a coil spring 16 inserted in the presser rod. You 1
5 is braked so that it is always contacted with a substantially constant pressing force in the direction of arrow S. FIG. 7 (a cross-sectional view along the cutting line-arrow in FIG. 5) shows another embodiment, in which a braking device 12 is applied to the rotating shaft 11 of the magnet roller 4. That is, in the embodiment, a brake shoe 15 is attached to the tip of a presser rod 14a which is pivotally mounted on the main body of the truck with a pin 17 as a fulcrum.
a, and a brake shoe 15a of the presser rod 14a is provided.
The spring 16 is installed inside the spring case 18 on the back side of the installation.
The brake shoe 15a is pressed in the direction of the arrow T by applying a presser pin 19 interposed therebetween and biased to protrude. Incidentally, the case 18 is provided on a bracket 20 attached to the main body of the truck.

The braking devices 10 and 12 shown in FIGS. 6 and 7 can alleviate uneven rotation of the magnet roller 4 due to uneven magnetic force, that is, uneven running of the traveling carriage 1. Furthermore, by eliminating the backlash caused by the play that occurs in the drive system, good welding can be performed.

As mentioned above, uneven running of the cart 1a is caused by variations in the circumferential magnetic force of the magnet roller and play in the drive transmission system, either individually or synergistically. Pressure braking prevents the rollers from rotating ahead of play in the drive force transmission system such as chains and gears. The braking may be any force that can prevent the roller from rotating due to variations in the magnetic force of the roller when the magnet roller momentarily becomes free to rotate due to play in the driving force transmission system. That is, the braking force is, as understood from the above configuration,
When the rotational force due to variations in the magnetic force of the magnet roller is applied in the positive direction, it acts in the negative direction, and conversely, when it is applied in the negative direction, it acts in the positive direction, so uneven running of the cart can be alleviated and eliminated.

By the way, the above-mentioned braking is naturally not preferable from the viewpoint of driving the bogie 1a, so it is desirable that the braking force be a necessary and sufficient amount, and the present inventors have experimentally found that the amount of braking force is Ten%
It was found that the degree was suitable.

With the above-described configuration, the present invention provides a simple braking mechanism to the magnet roller or its rotating shaft to prevent uneven running of the welding cart due to variations in the circumferential direction of the magnet roller and play in the drive force transmission system. I was able to resolve this by setting it up.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view showing one example of a traveling bogie, Fig. 2 is a front view of the same, Fig. 3 is an explanatory diagram of variations in magnetic force of the magnet roller, and Fig. 4 is another bogie to which the present invention is applied. 5 is a front view of the same, FIG. 6 is an enlarged view of a portion of FIG. 5 for explaining the embodiment of the present invention, and FIG. It is an explanatory view of an embodiment of the present invention. 1, 1a...Welding traveling trolley, 2...Horizontal plate, 3
... Vertical plate, 4, 4a ... Guide drive wheel, 5, 5a...
... Running wheel, 6... Drive sprocket, 7... Chain, 10, 12... Braking device, 11... Rotating shaft, 15, 15a... Brake shoe, 16, 1
6a... Spring.

Claims (1)

[Scope of utility model registration request] Prevention of uneven rotation in a magnet roller, characterized in that a brake shoe biased by a spring member is always in contact with a part of the rotating part of the magnet roller attached to a welding carriage. mechanism.