EP0401371A1 - Dispositif d'alimentation en poudre dans un cylindre d'une installation de detonation - Google Patents

Dispositif d'alimentation en poudre dans un cylindre d'une installation de detonation Download PDF

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Publication number
EP0401371A1
EP0401371A1 EP89903940A EP89903940A EP0401371A1 EP 0401371 A1 EP0401371 A1 EP 0401371A1 EP 89903940 A EP89903940 A EP 89903940A EP 89903940 A EP89903940 A EP 89903940A EP 0401371 A1 EP0401371 A1 EP 0401371A1
Authority
EP
European Patent Office
Prior art keywords
tube
powder
housing
section
movable section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89903940A
Other languages
German (de)
English (en)
Other versions
EP0401371A4 (en
Inventor
Vladimir Jurievich Ulyanitsky
Jury Arkadievich Nikolaev
Alexandr Ivanovich Buteev
Sergei Petrovich Khachaturian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institut Gidrodinamiki Sibirskogo
Original Assignee
Institut Gidrodinamiki Sibirskogo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institut Gidrodinamiki Sibirskogo filed Critical Institut Gidrodinamiki Sibirskogo
Publication of EP0401371A1 publication Critical patent/EP0401371A1/fr
Publication of EP0401371A4 publication Critical patent/EP0401371A4/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0006—Spraying by means of explosions

Definitions

  • the invention relates to devices for powder coating in the explosive process and relates to a device for feeding powder into the tube of a plant for explosive vapor deposition.
  • the present invention can be used in systems for the explosive vapor deposition of heat-resistant, corrosion-resistant, and wear-resistant coatings on parts and assemblies of mechanisms that are subject to abrasion wear in aggressive media.
  • the device for feeding powder into a tube is one of the main assemblies in systems for explosive vapor deposition, which must ensure the feeding of a certain portion of powder into a certain cross section of the tube at a certain time.
  • the fulfillment of these requirements ultimately determines the quality of the coatings produced, e.g. the durability of the properties of the coatings, the adhesive strength of the coating to the surface of the treated workpiece, the porosity, etc.
  • the powder is introduced into the one-sided open pipe of the explosive evaporation plant, which is filled with an explosive gas mixture, after which an explosion is initiated.
  • High-temperature flow of the E xplosions occur accelerated and heated, the particles of the powder interact with the surface of the lying outside the open end of the tube workpiece to interact and form a coating.
  • the dosing devices used in the systems for explosive vapor deposition must be fast-acting, have a long target operating time and dosing accuracy and must also be protected against explosion products (setbacks) and explosive gas mixtures that penetrate into the housing of the dosing device.
  • the metering devices used in the systems for explosive vapor deposition are divided into compressed air devices and mechanical devices according to the type of powder feed.
  • compressed air metering devices the powder is supplied by a compressed air pulse.
  • the powder cannot be put into a certain cross-section of the tube because the volume of the transport gas is much larger than the volume of the powder portion, which is why the powder particles are distributed in the form of an extended cloud along the axis of the tube as soon as they enter get the pipe.
  • incombustible gases for example nitrogen, are usually used as the transport gas, which dilute the explosive gas mixture in the tube in the zone in which the powder is supplied and thus cause the process to be inconsistent and the characteristics of the explosion products to deteriorate.
  • the metering device must ensure an even distribution of the particles in the cloud. At a uneven distribution, you do not get a uniformly thick coating on the surface to be treated, spots develop on the coating whose properties (thickness, adhesion, cohesion, porosity) differ significantly from the properties of the entire coating.
  • a device for feeding powder into the tube of a plant for explosive vapor deposition comes closest to the present invention (SU, A, 582004).
  • the device contains a housing which is mounted directly on the pipe of the plant for explosive vaporization, and a storage distributor with a rod accommodated in it with a recess for metering and a valve, which are located in the lower part of the storage.
  • the rod is moved by a pulse of compressed air that acts on a piston connected to the rod.
  • the metering device introduces the powder in a concentrated portion which, in the short time of interaction with the flow of the explosion products, cannot be converted into a cloud of particles, which leads to inhomogeneity of the coatings in thickness.
  • a disadvantage of this device is also its inertia, since the duration of the powder feeding into the tube depends on the duration of the downward movement of the rod and the duration of the filling of the dosing recess.
  • a major disadvantage of this construction of the device is the possibility of intrusion of the explosive gas mixture into the interior of the accumulator through a channel which is not sealed tightly and connects the interior of the accumulator with the interior of the tube, whereby the device can explode.
  • the present invention has for its object to provide such a device for feeding powder into the tube of a plant for explosive vapor deposition, the construction of which during the feeding of the powder into the tube minimal expansion of the powder cloud filling the entire cross section of the tube with a uniform distribution of the particles in the cloud and a reduction in the amount of time the powder is fed into the tube.
  • a device for feeding powder into the tube of a plant for ßXplosivaufpaugung containing a housing with a tube through this housing of the explosive vaporization system and a storage allocator of the powder to be dusted, according to the invention, three sections forming part of the pipe, the outer sections being rigidly connected to the housing and the central section having a drive for their reciprocating movement along the axis of the pipe, and the storage manifold in one of the zones of connection of the movable section is arranged with the immovable sections, the lower part of the housing below the storage distributor and the tube forming a chamber for collecting the powder, which is provided with a mechanism for returning the powder into the storage distributor.
  • Such an implementation of the construction ensures local feeding of the powder into the tube, ie, an equal initial position of the powder particles in the tube and their uniform distribution over the cross-section of the tube, which is achieved in that at the moment of loosening the connection between the movable and the immovable section of the powder veil that is continuously led from the bunker to the junction of the sections penetrates the space and fills the cross section of the tube.
  • the time it takes to fill the entire cross-section of the tube with powder is determined by the falling speed of the particles in the stream, which is determined by the height of fall and the distance between the outlet opening of the reservoir and the entry into the channel of the tube. By changing this distance, it is possible to regulate the time it takes to fill the pipe with powder and consequently the performance of the system.
  • the drive of the movable section is located in the other zone of the connection of the movable section with the immovable sections and contains a compression spring which is attached to the ends of the movable and immovable sections and a hermetically sealed one , annular chamber coaxial with the tube, which is connected to a source of positive pressure and is formed by the walls of the housing and the movable section and a flexible membrane, one wheel of which is attached to the housing and the other edge to the movable section.
  • the advantage of such a construction of the drive consists in accommodating the drive directly in the pipe of the plant at the ends of the sections, as a result of which a reciprocating movement of a section of the pipe can be generated without increasing the external dimensions of the plant.
  • a labyrinth seal is provided in the zone of the drive of the movable section at the point of connection of the movable and the immovable section, which is designed in the form of annular grooves on the cylindrical outer surface of the connecting section of the immovable section and with the inner surface of the moving section is connected .
  • Such a construction prevents the explosive mixture and the explosion products from flowing out of the tube into the interior of the housing.
  • one of the side walls of the storage distributor is articulated to the housing, and the width of the outlet slot of the storage distributor can be regulated.
  • Such a design makes it possible to regulate the amount of powder fed into the tube and to evenly distribute the powder particles in the stream.
  • a channel is made in the wall of the housing, which connects the interior of the housing to a source of excess pressure.
  • a channel is made in the wall of the housing, which connects the interior of the housing to a source of excess pressure.
  • the device for feeding powder into the tube of an explosive vapor deposition system contains a housing 1 (FIG. 1) with a tube 2 (part of the tube is shown in the figure) of the explosive vapor deposition system passing through this housing 1.
  • Fixed sections 3 and 4 are fastened to the housing 1, between which there is a movable section 5.
  • Sections 3, 4 and 5 are mounted coaxially to tube 2 and form part of tube 2 with a channel 6.
  • housing 1 there is a memory allocator 7 of the material to be dusted above channel 6 of tube 2 Powder with a vibrator 8.
  • the lower part of the housing 1 located between the storage distributor 7 and the channel 6 of the tube 2 forms a chamber 9 for collecting the powder, from which the powder is removed by means of a mechanism 10 (FIG. 2), for example , in the form of a bucket elevator provided with a drive 10 '(FIG. 1) is returned to the storage distributor 7.
  • a mechanism 10 (FIG. 2), for example , in the form of a bucket elevator provided with a drive
  • the movable section 5 has a drive 11 for its reciprocating movement, which has a compression spring 12 which is fastened to the end faces of the immovable 3 and the movable section 5, and a hermetically sealed, annular chamber 13 lying coaxially with the pipe 2 contains, the walls of which are formed by the outer surface of the movable section 5, the inner surface of the housing 1 and a flexible membrane 14, one edge of which is attached to the housing 1 and the other edge to the movable section 5.
  • the chamber 13 is by means of a nozzle 15 via a channel 16 and a control valve 17, e.g. an electromagnetic valve, connected to a pressure source (not shown in the figures).
  • the valve 17 periodically closes the inlet channel 16 of the chamber 13 and thus connects the interior of the chamber 13 times to the positive pressure source and sometimes to the atmosphere through a nozzle 17 '.
  • the joint "A" (Fig. L, 3) between the immovable section 3 and the movable section 5 is sealed by means of a labyrinth seal 18, which is in the form of annular grooves 19 on the cylindrical outer surface of the movable section 3 and with the inner surface of the movable section 5 is coupled with a space of 0.1 to 0.2 mm.
  • the seal 18 prevents the explosive mixture and the explosion products from flowing out of the channel 6 of the tube 2 and thereby ensures a free movement of the movable section 5 relative to the immobile section 3.
  • the memory allocator 7 is formed in a recess of the housing 1 by three walls 20 (FIG. 2) and a fourth movable wall 21 which is articulated to the housing 1 by means of an axis 22 and with the walls 20 of the Housing 1 forms an adjustable outlet slot 23 (Fig.l) for feeding the powder into the tube 2.
  • a regulating ring 28 is attached to the housing 1 and limits the movement of the movable section 5 and defines the size of the space between the sections 4, 5.
  • the device for feeding powder into the tube of an explosive vapor deposition system works as follows.
  • the time ⁇ for completely filling the tube 2 with a uniform powder flow is determined, which is practically the same ratio d / V o , where d is the interior of the tube 2 and V is the speed of the powder particles when entering the tube 2 designated.
  • This speed depends on the distance h between the upper edge of the inner surface of the tube 2 and the outlet slot 23 of the accumulator 7 and is calculated according to the formula gh determines where g denotes the acceleration of the free fall.
  • the drive ensures that section 5 is moved within 5 to 7 ms.
  • the firing speed of the system can be increased to 20 shots per second, which can increase the performance of the equipment many times over.
  • a workpiece (not shown in the figure) is then set up opposite the mouth of the tube 2, onto which a coating is to be applied.
  • the movable section 5 In the initial position, the movable section 5 is pressed by the spring 12 against the immovable section 4, and the powder flows in an uninterrupted flow through the slot 23 from the storage distributor 7, the connection point of the sections 4 and 5 flows around and falls into the chamber 9, from where it is returned to the storage distributor 7 with the aid of the device 10. This creates an uninterrupted, even flow of powder.
  • the pressure in the chamber 13 increases, which is transmitted by means of the flexible membrane 14 to the movable section 5, which thereby starts to move, thereby creating a gap between the sections 4, 5 and Access of the powder in the channel 6 of the tube 2 is free.
  • the section 5 moves away from the section 4 to the regulating ring 28, and the powder flows from the slot 23 of the storage distributor 7 into the resulting space through the entire cross section of the channel 6 as a uniform veil.
  • the spring 12 returns the section 5 to the starting position, whereby the tube 2 is closed and a portion of the powder is cut off inside the channel 6 of the tube 2, which is uniform over the cross section of the tube.
  • the explosive mixture located in the channel 6 of the tube 2 is ignited, the explosion products of this mixture tear the powder particles with them, heat them and apply them to the surface to be treated as a coating.
  • the labyrinth seal 18 prevents the explosion products from being expelled from the tube 2 at the moment of the shot through the joint "A" between the sections 3 and 5. Penetration of the explosive mixture into the interior of the housing 1 through the joint between the sections 4 and 5 is prevented by the excess pressure in the interior of the housing 1. Ejection losses of the powder from the interior of the housing 1 are prevented with the aid of the chamber 25 for collecting the powder.
  • the present invention can be used in systems for the explosive vapor deposition of heat-resistant, corrosion-resistant and wear-resistant coatings on parts and assemblies of mechanisms which are subject to abrasion wear in aggressive media.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

Le dispositif comprend une structure (1) dans laquelle passe un cylindre (2), et dotée d'un agencement (7) d'accumulation et de dosage de poudre. Le dispositif se compose de trois parties (3, 4, 5) dont celles (3, 4) se trouvant à l'extérieur sont reliées de manière rigide à la structure (1), alors que celle (5) se trouvant au milieu est dotée d'un entraînement destiné à assurer son mouvement de va-et-vient le long de l'axe du cylindre (2). La partie inférieure de ladite structure (1), située au-dessous de l'agencement (7) d'accumulation et de dosage de poudre, constitue une chambre (9) destinée à l'accumulation de poudre, dotée d'un mécanisme (10) destiné à renvoyer la poudre à l'agencement (7) d'accumulation et de dosage situé dans une des zones de jonction se trouvant entre la partie mobile (5) et les parties stationnaires (3, 4).
EP19890903940 1988-12-26 1988-12-26 Device for feeding powder into the barrel of a detonation installation Withdrawn EP0401371A4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1988/000277 WO1990007386A1 (fr) 1988-12-26 1988-12-26 Dispositif d'alimentation en poudre dans un cylindre d'une installation de detonation

Publications (2)

Publication Number Publication Date
EP0401371A1 true EP0401371A1 (fr) 1990-12-12
EP0401371A4 EP0401371A4 (en) 1991-09-11

Family

ID=21617371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890903940 Withdrawn EP0401371A4 (en) 1988-12-26 1988-12-26 Device for feeding powder into the barrel of a detonation installation

Country Status (3)

Country Link
EP (1) EP0401371A4 (fr)
JP (1) JPH03502778A (fr)
WO (1) WO1990007386A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997023299A1 (fr) * 1995-12-26 1997-07-03 United Technologies Corporation Appareil de type canon a detonation et procede s'y rapportant
WO1997023300A1 (fr) * 1995-12-26 1997-07-03 United Technologies Corporation Systeme d'alimentation en gaz par effet de recul pour canon a detonation
US6000627A (en) * 1995-12-26 1999-12-14 Aerostar Coatings, S.L. Detonation gun apparatus and method
CN101561449B (zh) * 2009-05-27 2010-12-01 内蒙古科技大学 防爆供粉装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889083A (en) * 1956-07-11 1959-06-02 Walter A Schwinhorst Apparatus for dispensing flocking material
US3558052A (en) * 1968-10-31 1971-01-26 F I N D Inc Method and apparatus for spraying electrostatic dry powder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU438215A1 (ru) * 1973-07-09 1977-11-25 Ордена Ленина Завод "Ленинская Кузница" Установка дл детонационной обработки материалов
SU1068537A1 (ru) * 1982-01-07 1984-01-23 Предприятие П/Я А-1575 Питатель дл дозировки порошкообразных материалов
SU1181331A1 (ru) * 1984-06-05 1989-10-23 Научно-исследовательский институт технологии автомобильной промышленности Установка дл детонационного напылени

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889083A (en) * 1956-07-11 1959-06-02 Walter A Schwinhorst Apparatus for dispensing flocking material
US3558052A (en) * 1968-10-31 1971-01-26 F I N D Inc Method and apparatus for spraying electrostatic dry powder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9007386A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997023299A1 (fr) * 1995-12-26 1997-07-03 United Technologies Corporation Appareil de type canon a detonation et procede s'y rapportant
WO1997023300A1 (fr) * 1995-12-26 1997-07-03 United Technologies Corporation Systeme d'alimentation en gaz par effet de recul pour canon a detonation
US6000627A (en) * 1995-12-26 1999-12-14 Aerostar Coatings, S.L. Detonation gun apparatus and method
CN101561449B (zh) * 2009-05-27 2010-12-01 内蒙古科技大学 防爆供粉装置

Also Published As

Publication number Publication date
EP0401371A4 (en) 1991-09-11
WO1990007386A1 (fr) 1990-07-12
JPH03502778A (ja) 1991-06-27

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