JPS5819571B2 - Automatic wire feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire feeding device used in a wire explosion spraying method, in which a large discharge shock current is applied to a wire to melt and explode the wire, and then spray the wire onto the inner surface of a cylinder or the like.

In the conventional wire bomb spraying method, as shown in FIG. The wire rod 101 was thermally sprayed onto a thermal spraying material 104.

Therefore, the spraying chamber must be opened and closed to supply the wire each time the spraying is performed, which is extremely inefficient and dangerous.

Therefore, as a method for continuously supplying the wire between the electrodes, a method was devised in which a long coiled wire is fed between the electrodes while being fed out with a roller.

However, in this method, when the wire is exploded, current flows through the entire wire and the rollers, making it difficult to insulate and at the same time extremely dangerous.

The present invention was created in view of the above-mentioned drawbacks, and an object of the present invention is to provide a device that automatically supplies and attaches a wire between electrodes in a radiation bomb spraying apparatus.

The automatic wire feeding device according to the present invention has electrodes facing each other on a vertical surface and holding the wire vertically between the electrodes, rather than the conventional method in which the wires are held horizontally by facing each other on a horizontal surface. The present invention also provides a device that automatically supplies wire rods for each thermal spraying process.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numerals 1 and 2 denote electrode tips, which are provided vertically facing each other on a vertical plane, hold a wire 5 for wire bombardment spraying, and have the role of electrodes; eyes.

Further, as shown in FIG. 5, the electrode tips 1 and 2 are cylindrical and have holes 1a and 13' formed at the ends thereof at right angles to the axial direction.

Chucks 3 and 4 hold the electrode tips 1 and 2, respectively.

Reference numeral 7 denotes a stopper with a guide that can move forward and backward in the horizontal direction.The tip of the stopper with guide 7 is composed of an inverted conical guide 6 at the upper part and a stop plate 7' at the lower part. The figure before operation is shown on the right, and the state after operation is shown on the right.

As shown in the figure, during operation, the guide 6 is connected to the electrode tip 1.
, 2, and the stop plate 7' is located below the electrode tip 2.

Further, although not clearly shown in the figure, a groove through which the wire rod 5 can pass is cut in the forward direction of the guide 6 (on the right side in FIG. 1).

Reference numeral 10 denotes a hopper for storing wire rods 51, and a plurality of hoppers 10 are provided, and at the bottom of the hopper 10 there is a funnel 9 having a continuous steep process slope so that the wire rods do not bridge and stop. A guide cylinder 8 connected to the lower end of the funnel 9 is provided.

The tip of the guide tube 8 is located directly above the opening 1a of the electrode tip 1.

11 is a drum, which is fixed to a shaft 13 via a key 14;
The shaft 13 is a bracket fixed to the upper end of the hopper 10)
It is supported by a bearing attached to 17.18.

The drum 11 has a cylindrical shape, and a groove 19 that can accommodate only one thermal spray wire 51 stored in the hopper 10 is divided into a plurality of equal parts in the axial direction, leaving a wide circumference on the outer periphery of the cylinder. It is engraved.

The bottom of the hopper 10 has an opening with a dimension in the circumferential direction of the drum 11 that fully exposes the circumference of the drum 11.

The shaft 13 of the drum 11 is located approximately on the extension of the inner wall of the hopper 10, and the drum 11 faces the funnel 9 side to the extent that the wire does not spill out into the lower opening of the hopper 10. A gap 20 is provided to prevent the wire rod 51 housed in the groove 19 from being ejected, and the wire rod 51 is covered by a cover 21 at approximately 90 degrees.

This cover 21 is fixed to the hopper 10 with bolts 32.

Further, a scraper 12 is attached to the inner wall surface of the wire supply side of the hopper 10 with a bolt 31 so as to be adjustable vertically and horizontally, and its tip is close to the outer peripheral surface of the drum 11.

A mold wheel 15 is pivotally supported on one end of the shaft 13, and rotates the mold wheel 15 and the drum 11 intermittently by an intermittent feed mechanism 16 shown in detail in FIG.

The intermittent feed mechanism 16 includes a cylinder 22 operated by hydraulic pressure or pneumatic pressure, a support rod 23, a feed pawl 24 meshed with a ratchet wheel 15, and a microswitch 25 for intermittently operating the cylinder 22. frame 2
It is fixed on 6.

A ball 27 is pressed into a hole 30 formed in the mold wheel 15 by a spring 28 housed in a notch case 29.

The present invention is configured as described above and operates as follows.

Various thermal spraying methods can be selected for the workpiece depending on the desired surface properties.

For example, by alternately spraying soft and hard wires,
A surface treatment with high hardness and stickiness can be applied.

In either case, multiple thermal sprays are required. Now, when the wire 5 is held by the electrode tips 1 and 2 and a discharge shock large current flows, the wire 5 is melted and exploded and fused to the inner surface of the workpiece.

Simultaneously with the thermal spraying of the wire 5, the cylinder 22 is activated, and the mold wheel 15 is rotated by one pitch by the feed pawl 24 via the support rod 23.

At this time, the ball 27 fitted into the hole 30 of the model car 15 was
It escapes from the hole 30 against the spring 28, and the one-pitch ratchet wheel 15
When it rotates, it enters the hole 30 of the next mold wheel 15 due to the elasticity of the spring 28.

At this time, the cylinder 22 is stopped and moved backward by a microswitch 25 via a control circuit.

At the same time as the mold wheel 15 rotates by one pitch, the drum 11 fixed coaxially with the mold wheel 15 rotates.

Only one wire rod 52 is accommodated in the groove 19 of the drum 11 by the action of the scraper 12, and this wire rod 52 passes through the cover 21, falls into the funnel 9, passes through the guide tube 8, and is removed from the electrode tip 1. and held between 2.

Simultaneously with the rotation of this drum 11, the width collar 7 operates,
It is waiting under the electrode tip 2 and prevents the wire 52 from falling from between the electrode tips 1 and 2.

Next, compressed gas is supplied through the chucks 3 and 4, and the pressure of the compressed gas crimply holds the wire 52 on the electrode tips 1 and 2.

That is, the wire 5 is in the state shown in FIG.

Then, the stopper 7 retreats, a large discharge shock current flows through the electrodes 1 and 2, and the wire 5' is melted and exploded.

1. Wire rods made of different materials are charged into the hoppers 10 and 10' shown in FIG. By dropping and feeding the wires alternately or in combination several times, it is possible to spray different wires in various combinations.

To explain more specifically, for example, a molybdenum wire (abbreviation M) is inserted into 10', a piano wire (abbreviation S) is inserted into 10', and MMMSMSMSSM is used as an example of firing 15 times.
Like SSMSSS, it is possible to create a composite layer by using different types of wire and exploding them.

Alternatively, although not shown, three or more drums 11 and an intermittent feed mechanism may be provided on the funnel 9 to store wire rods made of a plurality of different materials and supply them in a preset order to achieve a more effective surface finish. can be processed.

As explained above, the wire rod automatic feeding device according to the present invention has the following effects.

(1) By simply putting the wire into the hopper, the wire can be automatically fed between the electrode tips until the required number of explosions are completed.

(2) Since the wire can be supplied and installed between the electrode tips in a short time, the operating efficiency is significantly improved.

(3) By providing a plurality of hoppers to store different types of wire rods, and supplying and spraying the wire rods in a preset order, a thermal spray coating suitable for the purpose can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a detailed explanation of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a view of the upper right side of FIG. 1.
FIG. 4 is a front view of a conventional beam blast spraying device, and FIG. 5 is a perspective view of an electrode tip. 1, 2...electrode tip, 3, 4...curved chuck, 5.51, 52...wire rod, 7...
Stopper, 8... Guide cylinder, 9... Funnel, 10... Hopper, 11... Drum, 16... Intermittent feed mechanism.

Claims (1)

[Scope of Claims] 1. A single upright funnel with a continuous steep process slope below a plurality of hoppers for storing wire rods for beam blast spraying so that the wire rods do not bridge and stop. , connected to the lower end of the funnel, and the lower end is an electrode. Each hopper was provided with a guide cylinder extending directly above the whelk, and each hopper was provided with a drum in which grooves capable of accommodating only one wire rod were carved at equal intervals on the circumference between the hopper and the funnel. Equipped with an intermittent feed mechanism that feeds intermittently for each groove pitch,
An automatic wire rod feeding device for wire bombardment spraying characterized by feeding different wire rods in any combination by selectively rotating a drum.