JPH0321824Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a powder supply device used in plasma overlay welding.

(Prior art) In plasma overlay welding, a plasma formed between a torch that generates a plasma arc and a workpiece is used as a heat source to melt a powder material in the plasma arc and overlay it on the surface of a workpiece. The powder material is stored in a hopper, and is supplied from the lower end of the hopper to a torch that generates a plasma arc by a powder supply device in an amount to be overlay welded onto the surface of the workpiece. Conventionally, a powder supply device used for plasma overlay welding, as proposed in Japanese Utility Model Application Publication No. 61-4873, drops and supplies the powder material attached to the lower end opening of a hopper that accommodates the powder material. The supply roller is rotated by a motor, and the amount of powder material supplied is adjusted by the number of rotations. However, as shown in FIG. 4, when the powder is supplied by the supply roller 12, the powder scatters from the side of the supply roller 12, making it extremely difficult to supply the powder in a constant quantity. There was a problem in that the powder 5 flowing out from the outlet 7 fell violently from the side of the supply roller 12, resulting in insufficient powder supply.

(Problems to be solved by the invention) The present invention was devised to solve these current problems, and provides a device for quantitatively supplying powder material in plasma deposition welding. It is.

(Means for solving the problem) The gist of the present invention is to melt the powder material in the plasma arc using the plasma arc formed between the torch that generates the plasma arc and the workpiece as a heat source. , a screw for adjusting the vertical position of the hopper in a powder supply device placed between a hopper that accommodates the powder material and a plasma torch of a plasma overlay welding device that performs overlay welding on the surface of a workpiece; and a gear with a collar is disposed close to the lower end of the hopper to control the amount of powder material supplied by its rotational speed.

(Function) FIG. 1 shows an example of a powder supply device according to the present invention. Reference numeral 1 denotes a gear with a collar, which is connected to the motor 2 via a coupling ring 3. The gearbox 4 includes a hopper 6 that accommodates the powder 5 and a motor 2.
are attached to each. The distance between the powder outlet 7 at the lower end of the hopper 6 and the collared gear 1 is as follows:
Before welding, the adjusting screw 8 is adjusted by rotating and fixed with a lock nut 9, so that the adjusting screw 8 does not loosen during welding, and the interval can be maintained constant. Other means may be used to prevent loosening, such as providing a presser metal fitting.
The powder 5 falls onto the collared gear 1 which is being rotated by the motor 2, and the powder feed gas pipe 1
The powder is sent to the plasma torch 14 through the feed tube 11 by the powder feed gas supplied downward by the powder feed gas, and is overlay-welded onto the workpiece 15 while being melted in the plasma arc. By changing the rotation speed of the motor 2, the amount of powder 5 supplied can be adjusted quantitatively, and by finely adjusting the interval with the adjustment screw 8, the powder 5 falls onto the gear 1 with a collar. You can change the amount. usually,
The particle size of the powder material is 80 to 350 mesh, and a rubber seal 13 is attached to the flanged gear 1 to prevent the powder 5 from scattering outside the gear box 4.
FIG. 2 shows a detailed view of the collared gear 1 of the present invention. The collared gear 1 has a height of 3 to 300 mm at both ends of the spur gear.
It has a 5 mm brim and is S-shaped so that even if the powder 5 falls from the powder outlet 7 onto the gear, it will be supplied downward without scattering from the end of the gear.

(Example) Gear 1 with collar is a spur gear (module 1 to 1.5,
It has a flange of 5 mm height on both ends of the tooth (number of teeth 20 to 30, tooth width 20 mm), and the gap between the powder outlet 7 and the gear is set to 0.3 mm in advance, and the powder is supplied according to the rotation speed of the motor 2. Adjust amount. Figure 3 shows the relationship between the motor rotation speed and the amount of powder supplied. In this way, the powder could be reliably and quantitatively supplied by controlling the motor rotation speed.

(Effects of the Invention) As explained above, the powder supply device using the collared gear of the present invention can quantitatively supply powder and can be widely used in powder overlay welding.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of the powder feeding device of the present invention, Fig. 2 is a detailed front view of the collared gear,
FIG. 3 is a diagram showing the relationship between the motor rotation speed and powder supply amount of the present invention, and FIG. 4 is a schematic diagram of a supply roller of a conventional powder supply device. 1 is a gear with a collar, 2 is a motor, 3 is a coupling, 4 is a gear box, 5 is a powder, 6 is a hopper, 7 is a powder outlet, 8 is an adjustment screw, 9 is a lock nut, 10 is a powder feeding gas pipe, 11 is a feeding tube, 12 is a supply roller, 13 is a rubber seal,
14 is a plasma torch, and 15 is a workpiece.

Claims (1)

[Scope of utility model registration request] A powder supply device for plasma overlay welding placed between a hopper containing powder material and a plasma torch, which is equipped with a screw for adjusting the vertical position of the hopper and supplies the powder material close to the lower end of the hopper. A powder feeding device characterized by having a gear with a collar arranged to control the amount by its rotation speed.