JPH035222B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is an electrical appliance that has an effective function in application to parts necessary for all electrical appliances, communication equipment, etc., and heavy rust prevention treatment for large steel structures. This relates to arc-type thermal spraying equipment.

Conventional technology and its problems In general, electric arc thermal spray equipment supplies two thermal spray wires from a supply device via a cable to the anode and cathode contact tips of a thermal spray gun, respectively, and generates an arc between the two wires. The wire is melted and then blown onto the surface of the material using air. There are two methods for supplying the wire: a method in which a drive section is provided inside the thermal spray gun, and this drive section supplies the wire while pulling it from a supply device via a cable, and a method in which a drive section is provided inside the supply device. Two methods are known: (1) and (1) a method in which the wire is pushed out to a thermal spray gun via a cable (Japanese Patent Application Laid-open No. 108833/1983).

In the former case, since the driving part is installed inside the thermal spray gun, the weight of the thermal spray gun itself becomes large, making it difficult to carry out a wide range of handheld operations, and the tensile force of the driving part is weak, resulting in a long cable If the wire length exceeds the commonly used 3 m, the feed rolls will slip due to the resistance in the cable, making it impossible to feed the wire smoothly and resulting in unsatisfactory thermal spraying work.

On the other hand, in the latter case, the drive unit is installed inside the supply device, which has the advantage of reducing the weight of the thermal spray gun and making it easier to carry it by hand. However, even in this case, there is a limit to the rigidity of the wire, so If the length is too long, the wire will buckle inside the cable, making it difficult to feed it smoothly.

In particular, when using soft wire such as solder wire, zinc wire, or aluminum wire,
The wire tends to get caught in the rolls of the drive unit or buckle inside the cable, which is a fatal flaw in thermal spraying operations that require a stable supply of wire over long periods of time.

Purpose of the Invention The present invention has been made in view of such conventional problems, and its purpose is to provide an electric arc thermal spraying device that can always supply smooth and stable wire rods even when using soft wire rods. Our goal is to provide the following.

Structure of the Invention In order to achieve the above object, the present invention provides a first drive section for feeding the wire to the cable in the supply device, and a second drive section for feeding the wire to the contact tip in the thermal spray gun. A synchronization control device is provided for driving the first and second drive sections at the same speed.

In other words, by pushing out the wire with the first drive part in the feeding device and pulling the wire with the second drive part in the thermal spray gun, the wire can be fed without buckling even if the passage resistance in the cable is large. This enables smooth and stable wire supply at all times.

DESCRIPTION OF EMBODIMENTS FIG. 1 shows the overall structure of an electric arc thermal spraying apparatus according to the present invention, in which 1 is a supply device, 18 is a cable, 19 is an air hose, 20 is a thermal spray gun, and 40 is a synchronization control device.

The supply device 1 is equipped with reels 3 and 3 in which thermal sprayed wire rods 2a and 2b on the anode side and the cathode side are respectively wound into coils. A drive section 4 is provided. The first drive unit 4 is
As shown in FIG. 2, a large electric motor 5 is provided, and a worm 7 that meshes with a worm gear 8 is fixed to a rotating shaft 6 of the motor 5. The worm gear 8 is fixed to the center of a drive shaft 9, and grooved drive rolls 10 and 11 are fixed to both ends of the drive shaft 9, respectively, for feeding out the anode wire 2a and the cathode wire 2b. There is. A holder 13 is provided above the drive rolls 10 and 11 and is rotatable in the vertical direction about a support shaft 12, and presser rolls 14 and 15 are rotatably supported by this holder 13. Then, by urging the holder 13 downward by the spring 16, the presser roll 1
4 and 15 are in pressure contact with the drive rolls 10 and 11, respectively, and the wire rods 2a and 2b are fed into the cable 18 while being strongly gripped between these rolls.

As described in, for example, Japanese Patent Laid-Open No. 53-108833, the cable 18 has a structure in which a coil spring is provided for passing a wire therethrough, an electric wire is routed outside the coil spring, and the outer periphery of the coil spring is covered with an insulator. Two wire rods 2a and 2b are provided on the anode side and the cathode side to guide each of them.

The thermal spray gun 20 is provided with a second drive section 21 that sends out the wire rods 2a and 2b sent through the cable 18 to the tip. This second drive section 21 has exactly the same configuration as the first drive section 4 shown in FIG. It includes a grooved drive roll 23 and two presser rolls 24. At the tip of the thermal spray gun 20, an anode contact chip 25 and a cathode contact chip 26 are provided on both left and right sides as shown in FIG.
However, an air nozzle 27 is arranged in the center, and the outside thereof is protected by a cap 28. Contact chips 25 and 26 are supplied with + and - side electricity from the supply device 1 via cable 18 and gun necks 29 and 30, respectively.
Insertion holes 25a, 2 for contact chips 25, 26
When the wire rods 2a and 2b pass through the wire 6a, the wire rods are respectively charged. An arc is generated by short-circuiting both wire rods 2a and 2b, and this arc is blown onto the surface of the material by high pressure air blown from the air nozzle 27 to perform thermal spraying.

The tuning control device 40 detects the feeding speed of the wire rods 2a and 2b fed by the motor 5 of the feeding device 1, feeds this signal back to the amplifier section of the motor 22 of the thermal spray gun 20, and It is synchronized so that the motor 22 of the thermal spray gun 20 pulls the wire by the amount that the motor 5 pushes out the wire. Therefore, the roll on the supply device 1 side and the roll on the thermal spray gun 20 side can always feed out the wire at the same speed.

Generally, when feeding wire from a feeding device to a thermal spray gun, in addition to passing resistance when passing through the cable, inertial force when drawing out the wire from the reel and sliding resistance when passing through the contact tip insertion hole, etc. acts as a resistance force, so a large driving force is required. Conventionally, the wire was fed by a motor built into the thermal spray gun or a motor built into the feeder, so to speak, using a single drive system, which could not overcome the above-mentioned resistance force, causing the wire to fall onto the roll. There was a problem that stable wire supply was hindered due to slipping or buckling of the wire within the cable, making it impossible to perform satisfactory thermal spraying work.

In contrast, in the present invention, the first drive section 4 of the supply device 1 strongly pushes out the wire to the cable 18, and the second drive section 21 of the thermal spray gun 20 pushes out the wire from the rear. Since the wire is gripped and fed into the contact tip, the resistance force of the wire is not concentrated in one driving part, and the wire does not slip on the roll. Further, even if the wire fed into the cable 18 tries to buckle within the cable 18, the second drive section 21 continuously pulls the wire, so there is no fear of buckling. Therefore, stable thermal spraying work can be performed at all times, and quality can be significantly improved.

Further, the motor 22 on the thermal spray gun 20 side generates a tensile force that does not cause the wire fed into the cable 18 to buckle, and a push force that allows the wire to pass through the contact chips 25 and 26. Since it is sufficient to have a relatively small motor, it is possible to prevent an increase in the weight of the thermal spray gun 20, and the hand-held workability is not impaired.

In addition, in the above embodiment, the first and second drive sections 4,
21 are each driven by one electric motor 5, 22, however, separate motors may be provided for supplying the anode and cathode wires, and the supply speeds of these motors may be freely variable. It is something.

Further, the drive unit built into the supply device 1 and the thermal spray gun 20 is not limited to an electric motor, but an air motor can also be used, but an electric motor is easier to synchronize both motors.

Effects of the Invention As is clear from the above explanation, according to the present invention, the supply device and the thermal spray gun are each provided with a driving section,
Since these driving parts are driven in synchronization, even if the passing resistance within the cable or the sliding resistance of the contact tip is large, these resistance forces can be overcome and the wire can be fed smoothly and stably. In addition, in the past, the wire rods were supplied by a single drive, so the length of the cable that could supply the wire rods was limited to about 3 m, but in the present invention, the wire rods are driven by multiple drive units, so the cable of
There is no problem even if it is extended to about 10 meters, but extensive thermal spraying work is required. Furthermore, in the present invention, the wire is pushed out by the drive part of the supply device, and the wire is pulled by the drive part of the thermal spray gun, so even if a soft wire with low rigidity or a thin wire is used, the wire will not buckle inside the cable. The wire rod does not get caught in the roll, and the range of application of the wire rod can be expanded.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall configuration of an electric arc thermal spraying apparatus according to the present invention, FIG. 2 is a perspective view of a first drive section, and FIG. 3 is a cross-sectional view of the tip of a thermal spray gun. 1... Supply device, 2a, 2b... Thermal spray wire, 4
...First drive unit, 5...Motor, 10, 11...
Drive roll, 14, 15...Press roll, 18...
... Cable, 19 ... Air hose, 20 ... Thermal spray gun, 21 ... Second drive section, 22 ... Motor, 2
3... Drive roll, 24... Presser roll, 25,
26... Contact chip, 27... Air nozzle, 40... Tuning control device.

Claims (1)

[Claims] 1. Two thermal spray wires are supplied from a supply device to an anode and a cathode contact tip of a thermal spray gun via a cable, an arc is generated between both wires to melt the wires, and the wires are melted. In an electric arc type thermal spraying device that sprays air onto the surface of a material, a first drive unit is provided in the supply device to feed the wire to the cable, and a second drive unit is provided in the thermal spray gun to feed the wire to the contact tip.
An electric arc thermal spraying apparatus, comprising: a drive section; and a synchronization control device for driving the first and second drive sections at the same speed. 2 The first and second drive units include an electric motor and a feed roller driven by the motor,
2. The electric arc thermal spraying apparatus according to claim 1, wherein the electric motor of the first drive section has a larger driving force than the electric motor of the second drive section.