Other

Anatoly I Zverev

Alexandr S Bondarenko

Evgeny A Astakhov

Daniil A Dudko

Vadim Mikhailovich Sopryazhinsky

Nikolai Alexeevich Yakshin

Mikhail A Timoshin

Vasily G Skadin

Georgy G Pulyaevsky

Mikhail Antonovich Pudzinsky

Valery S Klimenko

A device for proportioning and feeding powder into a barrel of a detonation unit comprises a powder container communicating with a neutral gas pressure source, a bin accommodating two pipes which are coaxial during a powder feed cycle, the first pipe communicating with the powder container and being movable in relation to the second pipe which communicates with the barrel of the detonation unit, and a duct for the supply of a neutral gas to the inlet of the second pipe after proportioning of powder is over. The duct ends with a nozzle arranged at the inlet of the second pipe at an angle to its geometrical axis and is provided with a branch pipe whose first end is connected to the nozzle, while its second end is connected to the second pipe at some distance from its inlet, the first pipe being designed and arranged so that it is acted on by the neutral gas jet exiting from the nozzle and is thus displaced in relation to the second pipe.

Device for proportioning and feeding powder into barrel of detonation

The disclosed apparatus includes a detonation chamber constructed in the form of a barrel, a spark plug mounted in the barrel and powder feeding and gaseous mixture delivering systems communicating with the detonation chamber. The powder feeding system include a batchmeter communicating with the source of carrier gas by means of a gas conduit with a control member of the carrier gas feed controller for controlling the quantity of carrier gas delivered to the batchmeter within a unit of time mounted thereon. The apparatus also includes a control system having a powder detector for detecting powder in the detonation products, electrically connected with a control unit. The control unit effects switching on of the mechanisms and the systems in a predetermined succession and switching on of the actuating mechanism of the carrier gas feed controller, depending on the detector signal indicative of the powder presense in the detonation products.

Apparatus for coating by detonation waves

A coating is applied to a workpiece by ejecting a powdered material towards the workpiece using the energy of explosion in a recurrent cyclical operation. To produce an explosion, introduced into a combustion chamber of a detonation gun are a powdered coating material suspended in the stream of an inert gas and a gaseous explosive mixture formed by mixing a combustible gas and an oxidizing gas with or without an addition of an inert gas. During the coating process the explosive mixture is formed continuously, and cyclically filling the combustion chamber by portions of the explosive mixture is accomplished by feeding the inert gas to the pipe connecting the mixing chamber to the combustion chamber, which enables regular termination of the stream of explosive mixture and prevents the flame from spreading to the mixing chamber.

Method for coating

The apparatus comprises an explosion chamber made in the form of a tube closed at one end and accommodating at least one spark plug. The explosion chamber communicates with a chamber for preparation of an explosive mixture and with a batcher metering pulverulent coating material. The batcher includes a mixing chamber communicating with a hopper via a passage. The passage accommodates a device for controlling its cross-sectional area and is provided with a jet nozzle for positively feeding the coating material to the explosion chamber. A partition wall of a gas-permeable material is mounted within the hopper in equally spaced relation to the walls thereof to define an annular space communicating with a compressed gas source prevent self-compaction of the powder. A non-return valve is mounted in the portion of the batcher passage connected to the hopper to close the passage in case of back impact from the explosion chamber. This apparatus provides for more reliable cyclic batching of pulverulent coating material fed to the explosion chamber and is reliably protected against break-through of gas in case of back impacts from the explosion chamber as compared with conventional apparatus of the same type. This considerably improves the quality of coatings, especially when finely comminuted pulverulent coating materials based on refractory compounds are used.

Apparatus for explosive application of coatings

The apparatus comprises an explosion chamber made in the form of a tube closed at one end and accommodating at least one spark plug. The explosion chamber communicates with a chamber for preparation of an explosive mixture and with a batcher metering pulverulent coating material. The batcher includes a mixing chamber of the batcher communicating with a hopper via a passage. The passage accommodates a device for controlling the cross-sectional area thereof and is provided with a jet nozzle for positively feeding the coating material to the explosion chamber. A partition wall of a gas-permeable material is mounted within the hopper in equally spaced relation to the walls thereof to define an annular space communicating with a compressed gas source prevent self-compaction of the powder. A non-return valve is mounted in the batcher passage in the portion thereof connected to the hopper to close the passage in case of back impact from the explosion chamber. This apparatus provides for more reliable cyclic batching of pulverulent coating material fed to the explosion chamber and is reliably protected against breakthrough of gas in case of back impacts from the explosion chamber as compared with conventional apparatus of the same type. This considerably improves the quality of coatings, especially when finely comminuted pulverulent coating materials based on refractory compounds are used.

The apparatus comprises an explosion chamber 1 in the form of a tube closed at one end and communicating through a discharge pipe with a powdered coating batcher while a safety pipe communicates it with a mixing chamber 9 which prepares the explosive mixture ignited in the explosion chamber 1 by a spark plug 21. Installed between the safety pipe and the explosion chamber 1 is a circular precombustion chamber 10 which surrounds said explosion chamber and communicates with its space through holes 11 in its walls 12. The end of the discharge pipe 5 mounts a jet nozzle 13 which is installed in the face of the closed end of the explosion chamber coaxially with the latter so that its outlet section 16 is arranged ahead of the holes 11 in the walls of the explosion chamber 11 relative to the open end 17 of the latter. Due to such an arrangement, the process of discharge of the explosive mixture from the precombustion chamber 10 through the holes 11 in the walls 12 of the explosion chamber 1 into the space around the nozzle 13 is accompanied by drawing in the powdered coating from the nozzle 13 and its intensive mixing with the explosive mixture which produces a homogeneous two-phase mixture and a more uniform coating and ensures a more economical operation of the apparatus due to a more rational utilization of the coating materials.

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Kyiv, Ukraine

Anatoly I Zverev