SU1733113A1 - Pulsed powder feeder of gas detonation machine - Google Patents

Abstract

This invention relates to powder coating plants for coating applications. The goal is to expand technological capabilities and increase efficiency. For this, the device is provided with a housing part connected to a hopper in its lower part. A confuser, a grid, a two-line air throttle, a vibrator are connected to a body part. The body part is made with a depression in the form of a truncated cone-shaped funnel. The funnel is cut by vertical slots and in its lower part is connected to a cylindrical powder chamber. The grid is installed on the conical surface of the body part. The confuser is placed inside the bunker and installed on the grid, the sprayer is placed inside the confuser. A two-line air throttle is connected to the gas supply system and one of its output lines is connected to the powder sprayer, and another adjustable output line is connected to the hopper. 2 Il. (Ls

Description

The invention relates to powder metallurgy, mainly to the deposition of coatings for various purposes (iznoso-, heat-, thermo-, corrosion-resistant, etc.) detonation-gas method.

The purpose of the invention is the expansion of technological capabilities by controlling the consumption of powder, improving efficiency.

FIG. 1 shows a powder pulse feeder of a detonation-gas installation, a longitudinal section; in fig. 2 is a view of FIG. one,

The body part 1 of the powder pulsed feeder of the detonation-gas installation is made with a depression in the form of a truncated cone-shaped funnel 2, cut by vertical grooves 3,

transferring the lower part to the powder chamber 4. A spray gun 6 with nozzles 7 and a vibrator 8 are mounted on the body part 1 equipped with a rubber gasket 5. The bunker 9 is pressed to the body part with latches 10. A two-channel choke 1 is installed on the side surface of the bunker 9 1, to which the carrier gas impulse supply system 12 is connected, and on the bunker lid, a charging plug 13 and an outlet choke 14 with a material conduit 15 connecting to the barrel of the detonation gas unit. Inside the hopper 9 is installed a conical confuser 16, the lower base of which sits on the grid 17 mounted on the tapered surface of the housing part 1, and the upper base is attached to the outlet fitting.

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The feeder works as follows.

The powder is loaded into the hopper 9 through the stopper 13, then under the action of the vibrator it fills the chamber 4 to the level of the grid 17.

From the system 12 of supplying the carrier gas pulse with a frequency synchronized in phase and frequency with the operation of the detonation gas installation, the gas is pulsed to the throttle 11, where it is divided into two channels (into the bunker 9 and the atomizer 6), and the flow area of the channel in the bunker can be regulated, as a result of which the pressure in the bunker and the confuser is equalized and the distillation of powder from the bunker 9 to the confuser 16 and, conversely, from the confuser to the bunker and the segregation of the powder accompanying it is eliminated. The gas pulses from the atomizer 6 through the nozzles 7 are directed to the powder layer under the mesh 17 in the chamber 4 and blow it into the confuser 16. The conical confuser 16, having a considerable height and small taper angle, ensures the continuity of the gas flow, which allows It is possible to spread and expand the range of speeds necessary for organizing a gas-powder dose pulse, varying the dose and transporting it to the barrel of a detonation gas unit. The flow rates in the confuser are distributed along the height with an increase from bottom to top. The powder cloud due to the obtained pneumatic impulse reaches a certain height. If the soaring speed of a given powder is equal to or greater than the flow rate at the height of the confuser reached by the powder, then the powder lost through the gravity by the initial speed either hangs or goes down. With an increase in the flow rate of gas generated by pulses, the powder cloud, rising higher, reaches the zone of smaller cross sections of confuser 16, therefore, of higher speeds, accelerates and through the choke 14 and the material duct 15 enters the barrel of the detonation gas installation in pulses.

Large particles that accidentally get into the powder, as well as the crumpled powder, cannot get into the zone of necessary speeds and come back, due to which the quality of the aerated powder entering the barrel of the installation is improved, which improves the quality of the coating.

The powder feed pulse ends before starting the detonation mixture in the barrel of the detonation gas unit. During the explosion, high pressure is generated in the barrel, resulting in

the resulting gases are partially fed back through the material line 15 to the confuser 16 and the bunker 9. The passage through the confuser from a smaller section to a larger one, the flow as a result of expansion loses its speed so that it cannot aerate the powder in the bunker 9, as a result of which the powder does not split by size and density, degrading the quality of the coating. After the release of detonation products from

the feeder to the barrel returns redundant,

gas from the barrel

exhaust gas from exhaust gases.

Such a device provides a pulsed supply of a well-aerated dose of a powder with a mass of 0.02-0.08 g used per cycle during detonation-gas spraying of coatings, and, unlike the prototype, due to the closed bunker and two-channel choke and vibrator, it maintains a constant powder level. in the powder chamber. The device has no mechanical components and working pairs working in the medium of powders, which mainly have abrasive properties,

For successful operation of the feeder, the feed gas impulse delivery system can be both electrically and mechanically driven. It should have the property of synchronization and pulse variation in time and pressure.

The use of a dosing unit in conjunction with a pulse shaping system allows to obtain a clear dose of powder in

5 as a well-aerated gas-powder mixture, as well as adjust the injected dose.

Due to the axial movement of the sprayer, it is possible to adjust the feeder

Claims (1)

0 for powders with any physical properties and due to the throttle installed on the bunker, completely eliminate segregation of the powder by size and density. Invention Formula 5 Powder pulse feeder of a detonation-gas installation, containing a bunker, a material pipeline, a pulsed gas supply system with a sprayer and a gas pipeline, is distinguished by the fact that, in order to expand technological capabilities by adjusting the powder flow rate, increasing efficiency, the device is equipped with a cabinet part connected to the bunker in 5 of its lower part, with a confuser, a grid, an air throttle with two output lines, one of which is adjustable, and a vibrator connected to the body part, the body part is made with a hollow in the form of a truncated cone-shaped funnel, cut by vertical grooves, passing into the cylindrical powder chamber in the lower part, the grid is mounted on the conical surface of the body part, the confuser is placed inside the bunker and made with confuser nozzles, and a pneumodro to the gas supply system; installed on the grid, the powder sprayer is connected to the hopper. made with nozzles and placed inside the confuser, and the air throttle is connected to the gas supply system, with one output line connected to the powder sprayer, and an adjustable output line FI.1 viewA 17 Editor T. Lazorenko Tehred M. Morgenthal Order 1622 Circulation: Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk emb. 4/5 Production and Publishing Combine Patent, Uzhgorod, Gagarin st., 101 sixteen phi.2 Proofreader M.Maksimishinets