EP1652621B1 - Procede de grenaillage et appareil de mise en oeuvre de ce procede - Google Patents

Procede de grenaillage et appareil de mise en oeuvre de ce procede Download PDF

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Publication number
EP1652621B1
EP1652621B1 EP04733217A EP04733217A EP1652621B1 EP 1652621 B1 EP1652621 B1 EP 1652621B1 EP 04733217 A EP04733217 A EP 04733217A EP 04733217 A EP04733217 A EP 04733217A EP 1652621 B1 EP1652621 B1 EP 1652621B1
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Prior art keywords
diameters
abrasive
nozzle
gas
air
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EP04733217A
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German (de)
English (en)
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EP1652621A4 (fr
EP1652621A1 (fr
Inventor
Andrey Vasilievich Anischenko
Nicolai Alekseevich Galchenko
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0069—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with means for preventing clogging of the equipment or for preventing abrasive entering the airway
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/08—Devices for generating abrasive blasts non-mechanically, e.g. of metallic abrasives by means of a magnetic field or by detonating cords

Definitions

  • the invention belongs to the field of gas jet grinding treatment and can be used in cleaning (removal of corrosion and dirt) of bridges, containers, ships, railway cars, automobiles, building structures and technological equipment, as well as roughness modification, to improve decorative properties of different surfaces.
  • Methods are known for workpiece processing with a high-speed two-component jet whose dispersion medium is gas and whose disperse phase are abrasive particles.
  • the methods include introducing the disperse phase from the pressure vessel into the bulk material line, mixing with the dispersion medium, feeding to the nozzle, and accelerating the abrasive by converting the gas pressure to kinetic energy and generating a high-speed, two-component jet as a tool for the treatment the workpiece top layer is used.
  • the amount of the abrasive in the high-speed two-component jet is controlled by the passage cross-section of a metering device, which is between the pressure vessel and the bulk material line is mounted, wherein the pressure in the pressure vessel and in the bulk material line is measured (patent US 5081799 ,
  • Patent US 5083402 This technical solution allows the supply of the abrasive in a wide range of 0.22 to 4.5 kg (Patent US 5083402 ) too.
  • the main disadvantage is the supply of the abrasive directly to the bulk material line. Low disperse phase velocity and static overpressure results in an unstable ratio of disperse phase and dispersion medium, low kinetic viscosity and, as a result, a reduction in efficacy and performance of the treatment.
  • the known shot peening method is used in a blast cleaning apparatus, model ASO-150 (technical specification TS 5251-020-03082926-2002, blast cleaning apparatus, model ASO-150).
  • This shot peening process involves introducing gas together with an abrasive into a container, shutting off the shutter necked throat, generating a pressure in the container, supplying gas to a nozzle, supplying the abrasive particles self-flowing from the container via a doser Via a hose to the nozzle and the generation of a two-component jet, which is used as a tool for surface treatment.
  • the abrasive comes but due to the pressure difference at the inlet and outlet of the metering pulsating into the receiving socket.
  • nozzles are used in small lengths of 80-115 mm, resulting in only a small conversion (3-5%) of gas pressure into kinetic energy of the abrasive particles.
  • these machines are characterized by low power (5-7 m 2 / h) and high consumption of abrasive (60-90 kg / m 2 ).
  • a similar technical solution is a method that is used in the apparatus for grinding in the copyright certificate SU 1145575 is described.
  • This method consists in using the gas pressure to displace the abrasive from the container into a mixing chamber and further operating with a central and radial opening of the bulk material feeding device.
  • this solution ensures a more stable supply of the abrasive, but one Blockage of the passage cross-section of the dosing device is not excluded.
  • the velocity of the gas flow in the mixing chamber remains low and decreases in the area of the abrasive supply, which can cause pulsations.
  • the main disadvantage is the operation, in which the supply strength of the abrasive is controlled by changing the passage cross-section of the metering.
  • problems such as the selection of an optimal acceleration distance, the generation of a high-speed two-component beam, an angle of attack and distance to the surface to be machined are not solved.
  • a sandblast grinder in which air from a source of pressurized air serves to form an abrasive jet in an abrasive container.
  • the abrasive jet is generated by a flexibly mounted ball vibrator.
  • the air from this compressed air source serves to suck in a steady amount of abrasive material and eject it from a nozzle.
  • a pressure feed container known to carry a powdered material in a stream of propellant gas.
  • This container has a hopper which is resiliently suspended by a flexible member in the container.
  • a vibrator such as an electric motor with an eccentric weight on the motor shaft, shakes at the bottom of the hopper.
  • the vibratory forces of the vibrator are preferably transmitted from a flexible membrane to the hopper.
  • the hopper is thus subjected to first vibrational forces acting with a torque from below, and second reaction vibrational forces acting with a torque from above. This causes the powder material in the hopper to circulate and mix thoroughly.
  • the powder material is passed through an inlet opening through which the powder material gets into the propellant gas stream.
  • This pressure feed container is particularly suitable for dispensing abrasive powder to a manually operated tooth tool for abrasive treatment of the teeth of living beings.
  • the technical object of the invention is to increase the performance and efficiency of the shot peening treatment due to the increase of the kinetic energy of the abrasive by converting the static gas pressure and the loss reduction in the destruction of the top layer.
  • the two-component jet is generated by means of an acoustic effect, a material neck vibration and an increase in the pressure difference of the gas in the inlet and outlet.
  • the abrasive is accelerated via the feed line in an accelerator on a track with a length of 30-120 of its caliber and directed to the surface to be machined at an angle of 15-45 0 at a distance of 35-95 its caliber.
  • the two-component jet is generated by introducing an abrasive into the gas stream to a ratio of dispersing medium to disperse phase of 0.7 to 0.9.
  • the supply of an optimum amount of the abrasive is ensured by an acoustic effect and a vibration with the vibration frequency of 500-1000 Hz and a vibration amplitude of 0.3-0.7 mm.
  • the required ratio of the dispersion medium to the disperse phase is ensured by a self-regulating pneumatic system which increases the vibration while reducing the gas consumption in the jet supplied to the material nozzle.
  • the system is self-regulating, since the vibration and the acoustic effect increase with the reduction of the amount of gas, whereby the frictional forces between the abrasive particles are weakened.
  • a Tari apparatus (hereafter referred to as apparatus) has been developed, which comprises a nozzle and a container with a metering device, which are connected to one another via conveying and gas lines as compressed gas source.
  • the nozzle has a length of 30-120 caliber, and the doser is equipped with a broadband acoustic generator, a multi-orbiting vibrator, an activator and a centrifugal water separator.
  • the vibration generator has at an acute angle arranged plates, runners of different weights, Tangenzial- and radial nozzle for gas supply and an ejector, which is arranged from top to bottom under the material nozzle for abrasive dispensing from the cavity of the activator.
  • the activator is in the form of a sleeve with wall recesses for passing the abrasive particles and with a channel for evacuating gas from a T-piece passing through the housing.
  • the runners of the vibration exciter are carried out in the form of balls.
  • the larger ball has a diameter of 2.3-2.4 of the caliber, the smaller ball has a diameter of 0.9-1.0.
  • the diameters of the intermediate balls change in decreasing dependence.
  • the Tangentialstutzen has the form of a supersonic nozzle with a cross section of 0.95-0.98 of the caliber.
  • the activator has to gas supply a tangential and a vortex chamber in its bottom, the cross section of the tangential channel max. 0.5 caliber and the bulk material neck is 0.8-0.9 caliber.
  • Tables 1 and 2 show the vibration frequency and the sound intensity with a change in the rotor diameter, their position and the ratio of the critical nozzle value (the narrowest cross section of the nozzle) to the running caliber.
  • the apparatus includes a nozzle 1, which is connected to a metering device 2 of a container 3 with a bulk material line 4.
  • the metering device 2 is connected to a compressed gas source, eg air, via a tangential connection 5 in the form of a supersonic nozzle with a valve 6 and a radial connection 7 with a valve 8.
  • the container 3 is connected to a tee 9 via a valve 10.
  • the nozzle 1 has a length of 30-120 of the running caliber.
  • the doser 2 is with an acoustic Broadband generator 11, a vibration generator 12 with a Zentrifugalwasserabscheider 13, an activator 14, a material nozzle 15 and an ejector 16 is provided.
  • the vibration exciter 12 is designed as a multi-circuit exciter with under acute angles 18 mounted plates 17, runners 19, 20 and 21 in the form of spheres of different weight, each large, medium and small.
  • the Zentrifugalwasserabscheider 13 has a Koaxialspalt 22, which is located in the vicinity of the lower part of the vibration exciter 12, a ring pocket 23 for condensate collecting and a discharge nozzle 24 with hydraulic closure 25.
  • the designed as a sleeve with wall recesses 37 for passing the abrasive from the container 3 activator 14 is disposed above the vibration exciter 12 and has a channel 26 in the bottom for gas discharge from the T-piece 9 through the housing 27 in cavities 28.
  • the material nozzle 15 connects the cavities 28 of the activator 14 and the ejector 16 and is arranged on the axis of the metering device 2.
  • the arranged in the bottom of the metering 2 with an annular gap 29 ejector 16 is directed from top to bottom of the material nozzle 15 to the bulk material 4.
  • the container 3 has a vibrating screen 30 and a hopper 31 for feeding, which is provided with a closure flap 32 which is arranged on a top nozzle 33 of the tee 9.
  • an outlet 34 is arranged with a valve 35.
  • the runners have the shape of balls with a largest diameter 19 of 2.3-2.4 of the running caliber, a smaller diameter 21 of) 0.9-1.0 and a mean diameter 20 of 1.6-1.7 the running caliber 1; that is, the diameters change from top to bottom in decreasing dependence.
  • the Tangentialstutzen 5 has the form of a supersonic nozzle with a critical cross-sectional value of 0.95-0.98 of the Laufkalibers 1.
  • the activator 14 is provided with a swirl chamber 36 and a Tangentialkanal 26 for supplying gas from the T-piece 9 via the housing 27.
  • the cross section of the tangential channel 26 is max. 0.5 of the running caliber 1.
  • the nozzle cross-section 15 is between 0.8 and 0.9 of the running caliber. 1
  • the apparatus works in the following way.
  • the container 3 is filled with the abrasive via the vibrating screen 30 and the hopper 31, for example, with green silicon carbide having a grain size of 500 (0.476-0.510 mm) according to the GOST standard 26327-83.
  • the valve 10 is turned off, the valve 35 is turned on, the pressurized gas is discharged from the container 3 via the outlet port 34 and the closure flap 32 is depressed.
  • the hydraulic shutter 25 is opened, the valve 8 is turned off, the valve 6 is turned up a little and the compressed gas is supplied to the tangential nozzle 5 and the vibration generator 12.
  • the pressurized gas swirls under the centrifugal force and presses against the wall of the vibration exciter 12.
  • the gas flow is first expanded and then via the centrifugal water separator 13 and the ejector 16 compressed.
  • the rate of fluidization of the gas flow from the periphery to the axis of the vibratory exciter 12 increases with the reduction in radius, that is, the static pressure changes to a dynamic pressure. The pressure drops below the atmospheric pressure.
  • the abrasive Under the pressure difference, the abrasive through the recesses 37 and the waste air from the hopper 31 via the upper stub 33 of the T-piece 9, through the channel 26 in the bottom of the activator 14 and the hollows 28 in the socket 15 and on to the ejector 16th and conveyed to the annular gap 29, where the central forced swirl is generated under frictional force; then the abrasive flows with the dust from the discharge line 4 and the barrel 1.
  • the rotation of the runners 19, 20 and 21 generates a vibration which operates the vibrating screen 30 via the container 3 and the hopper 31, so that the charging quality and the speed of the abrasive are increased.
  • the frequency of a few Hz to 2 kHz and the oscillation amplitude of 0.3-0.7 mm are continuously adjusted by changing the amount of compressed gas by means of the valve 6.
  • the run 1 is directed to the surface, which is pretreated simultaneously with the feed.
  • Run 1 is directed at a distance of 35-39 running calibers to the surface treated with the two-component jet at an angle of 15-45 °, with the ratio of the disperse phase to the dispersion medium being set between 0.7 and 0.9.
  • the valve 35 is turned off, so that the omission of the Pressure gas is prevented via the outlet 34.
  • the valve 10 is turned on, and the compressed gas is introduced into the container 3 via the tee 9.
  • the shutter 32 is pushed up and locks the hopper 31 from. Then, the compressed gas flows from the T-piece 9 passing through the housing 27 via the tangential port 26 into the swirl chamber 36.
  • the gas fills the container 3 through the recesses 37 and loosens up the agglomerated abrasive particles.
  • the abrasive passes through the recesses 37 of the activator 14, the abrasive is collected with the gas flow from the vortex chamber 3 and entrained in the material nozzle 15 of the metering device 2 and in the ejector 16 in which it is mixed with the gas flow and is introduced into the pipe 4 and further into the barrel 1.
  • the gas supply through the designed as a supersonic nozzle Tangentialstutzen 5 to the wall of the acoustic broadband generator 11 creates a turbulent boundary layer, which forms together with the mounted around the pointed angles 18 plate 17 rotors 19, 20 and 21, a sound source, which on the abrasive in Container 3 acts.
  • the abrasive is accelerated in the barrel 1 with a length of 30-120 barrel caliber, and the two-component beam is directed at the angle of 15-45 0 and distance to the run of 35-95 run calibers to the surface to be machined.
  • the two-component jet is generated by introducing the abrasive into the gas flow in an amount ratio of the dispersion medium to the dispersed phase of 0.7-0.9.
  • An optimal amount of abrasive is ensured by the acoustic effect and vibration with a vibration frequency of the doser of 500-1000 Hz and a vibration amplitude of 0.3-0.7 mm.
  • the required ratio of the dispersion medium to the disperse phase is maintained with the self-regulating pneumatic system, wherein the vibration is increased while reducing the gas consumption in the material nozzle 15 supplied beam.
  • the shot peening is finished as follows.
  • the valve 10 is turned off, and the gas introduction into the T-piece 9 and the housing 27 is stopped.
  • the valve 6 is turned off, bringing the acoustic effect and the vibration of the material nozzle 15 are stopped.
  • the valve 8 of the Radial nozzle 7 and the hydraulic closure 25 for the outlet of the condensate from the ring pocket 23 of the metering device 2 via the coaxial gap 22 and the outlet nozzle 24 are turned on; while the pressure in the barrel 1 via the bulk material line 4 is reduced.
  • the valve 35 is turned on, the pressurized gas is discharged from the container 3 via the outlet port 4, and the shutter 32 is depressed.
  • the apparatus according to the invention thanks to the design and technical solutions has a high impact and extends the application possibilities.
  • the developed dispenser is durable, safe and compact.
  • the accelerator in the form of a barrel with a length of 30-120 barrel calibers makes it possible to obtain a maximum kinetic energy of the dispersion medium.
  • the evaluation of the shot peening according to the GOST standard 9.402-80 and the ISO 8501-1 / 1988 confirms the conformity of the characteristics of the machined surface with the highest quality, the degree of cleaning 1 and the class Sa3.
  • the barrel with the length of 30-120 calibers, the larger, medium and smaller barrels, the supersonic nozzle, the tangential channel with the given cross-section, the barrel caliber of 2,3-2,4, 1,6-1,7, 0, 9-1.0, 0.95-0.96, ⁇ 0.5, 0.8-0.9 respectively, are optimal. Deviation from the given values decreases the performance of the apparatus.
  • the optimum ratio of the dispersion medium to the disperse phase is between 0.7 and 0.9.
  • the required amount of abrasive is supplied under the acoustic effect and the vibration with a vibration frequency of 500-1000 Hz and a vibration amplitude of 0.2-0.7 mm.
  • the two-component beam is directed onto the surface to be processed at the angle of 15-45 0 to the barrel and spaced 35-95 barrel calibres.
  • the empirical dependencies are determined by approximation of the optimum values and by determining the deviation influence of one of the indicators on the basic parameters.
  • the shot peening was carried out by means of runs with calibers of 4-16 mm and a pressure of 0.6 MPa.
  • the effectiveness was determined by a specific abrasive consumption per 1 m 2 of the machined surface.
  • the performance was measured at the surface treatment after Sa2.
  • Experience has shown that the best technological results are achieved with an acceleration of the abrasive in the accelerator with a length of 30-120 running calibres ( Fig.2 ). Over the course of 10-20 running calibres, the specific abrasive consumption decreases and has its minimum at the limit of the range of 30-120 running calibers, this can be explained by the intensive conversion of the pressurized gas energy into kinetic energy of the two-component jet.
  • a further extension of the acceleration section over a length of 120 calibars leads to a reduction in the speed of the abrasive due to the friction on the running walls.
  • the 30-120 run caliber stretch is an optimum path in terms of total disperse phase kinetic energy that determines specific abrasive consumption and processing efficiency.
  • Equipping the doser with the vibrator causes vibration, which weakens the frictional forces between the abrasive particles and increases the supply of abrasive to the ejector.
  • the movement of the runners horizontally and vertically is ensured by the arrangement of the plates at acute angles, so that a three-dimensional vibration is generated.
  • the attachment of the activator in the upper part of the bulk material neck makes it possible to soften lumps and to prevent the supply of abrasives when vibration is switched off.
  • the ratio of the dispersion medium to the disperse phase of 0.7-0.9 is optimal ( Fig. 3 ). With the ratio above 0.9, the abrasive speed decreases, which determines a quadratic dependence of the kinetic energy and ultimately the performance.
  • the other graphics ( Fig. 4-9 ) give optimal values for following parameters: an optimal amount of abrasive is obtained by the acoustic effect and vibration with the vibration frequency of the doser of 500-1000 Hz and the amplitude of 0.3-0.7 mm; the two-component jet (tool) is steered to the surface to be treated at an angle of 15-45 ° and at intervals of 35-95 running calibers; the cross section of the tangential channel is max. 0.5 barrel and the barrel 0.8-0.9 barrel caliber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Cleaning In General (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Threshing Machine Elements (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Tyre Moulding (AREA)

Claims (8)

  1. Procédé pour grenailler, y compris détruire et éliminer, la couche supérieure de l'objet à grenailler, par un jet d'abrasif dans l'air, constitué d'abrasif dispersé dans l'air, dans lequel le jet d'abrasif dans l'air passe d'une cuve en un flux de soi-même sous la force de la gravité par une tubulure, un dispositif d'addition dosé, un conduit de transport et une buse sous la forme d'un passage,
    dans lequel,
    le jet d'abrasif dans l'air est produit par un effet acoustique, à savoir une vibration d'une tubulure de matériau, et par l'accélération dans un éjecteur, caractérisé en ce que les particules d'abrasif sont accélérées sur 30 à 120 fois le calibre du passage et sont déviés à la distance de 35 à 95 fois le calibre du passage sous un angle de 15 à 45° sur la surface a traiter.
  2. Procédé suivant la revendication 1,
    caractérisé
    en ce que
    l'on envoie la quantité optimale sous l'effet acoustique et la vibration à une fréquence d'oscillation dans le dispositif d'addition dosé de 500 à 1000 Hz et avec une amplitude de 0,3 à 0,7 mm.
  3. Procédé suivant la revendication 1,
    caractérisé
    en ce qu'un système pneumatique se régulant de soi-même assure le rapport nécessaire des quantités d'abrasif et d'air, la vibration étant augmentée avec diminution simultanée de la consommation d'air dans le jet envoyé à la tubulure.
  4. Dispositif de grenaillage qui comprend une buse (1) et une cuve (3) ayant un dispositif (2) d'addition dosée, qui communiquent entre eux par un conduit (4) de transport et avec une source d'air comprimée ainsi qu'un conduit pour de l'air,
    caractérisé
    en ce que la buse a la forme d'un passage ayant une longueur de 30 à 120 calibres du passage en ce que le dispositif d'addition dosé comprend un générateur (11) acoustique à large bande, un excitateur (12) de vibration ayant un éjecteur (16) à plusieurs circuits, un activateur (14) et un séparateur (13) centrifuge d'eau, l'excitateur (12) de vibration étant muni d'assiettes (17) disposées suivant un angle aigu, de rotors (19, 20, 21) de poids différents, d'une tubulure (5) tangentielle et d'une tubulure (7) radiale pour l'apport d'air et d'un ejecteur (16) disposé de haut en bas et sous une tubulure (15) de matière pour l'apport de l'abrasif, l'éjecteur ayant la forme d'un manchon (37) ayant des évidements de paroi pour le passage des particules d'abrasif et un canal pour l'entrée d'air à partir d'une pièce (9) en T passant à travers une enveloppe (27) du dispositif.
  5. Dispositif suivant la revendication 4,
    caractérisé en ce que les rotors sont constitués sous la forme de billes, le diamètre le plus grand représentant de 2,3 à 2,4 fois le calibre du passage et le diamètre le plus petit de 0,9 à 1,0 fois le calibre du passage et les diamètres des billes intermédiaires se modifiant en diminuant.
  6. Dispositif suivant la revendication 4,
    caractérisé en ce que la tubulure (5) tangentielle à la forme d'une buse d'ultrasons, ayant une section droite représentant de 0,95 à 0,98 fois le calibre du passage.
  7. Dispositif suivant la revendication 4,
    caractérisé en ce que l'activateur (14) a un canal (26) tangentiel et une chambre (36) de tourbillonnement au fond pour l'apport d'air.
  8. Dispositif suivant la revendication 7,
    caractérisé en ce que la section transversale du canal (5) tangentiel représente au "maximum 0,5 fois le calibre du passage (figure 9) et en ce que la section transversale de la tubulure (15) de matière représente de 0,8 à 0,9 fois le calibre du passage.
EP04733217A 2003-05-15 2004-05-14 Procede de grenaillage et appareil de mise en oeuvre de ce procede Expired - Lifetime EP1652621B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2003114112/02A RU2248871C2 (ru) 2003-05-15 2003-05-15 Способ дробеструйной обработки и аппарат "тари" для его осуществления
PCT/RU2004/000185 WO2004101224A1 (fr) 2003-05-15 2004-05-14 Procede de grenaillage et appareil de mise en oeuvre de ce procede

Publications (3)

Publication Number Publication Date
EP1652621A1 EP1652621A1 (fr) 2006-05-03
EP1652621A4 EP1652621A4 (fr) 2007-03-28
EP1652621B1 true EP1652621B1 (fr) 2008-12-31

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EP (1) EP1652621B1 (fr)
AT (1) ATE419092T1 (fr)
DE (1) DE502004008784D1 (fr)
RU (1) RU2248871C2 (fr)
WO (1) WO2004101224A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN210084500U (zh) * 2018-04-24 2020-02-18 冷喷有限责任公司 颗粒喷射系统及其送料器组件、流体控制阀及其致动器
RU210050U1 (ru) * 2021-11-12 2022-03-25 Акционерное общество "Национальный центр вертолетостроения им. М.Л. Миля и Н.И. Камова" (АО "НЦВ Миль и Камов") Устройство для местного упрочнения

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067150A (en) * 1975-11-03 1978-01-10 Argonite, Inc. Sandblast abrading apparatus
SU1650409A1 (ru) * 1988-05-30 1991-05-23 Предприятие П/Я А-7555 Устройство дл струйной обработки изделий
US5081799A (en) * 1990-04-06 1992-01-21 Church & Dwight Co., Inc. Blasting apparatus
US5433653A (en) * 1993-10-29 1995-07-18 Friess Equipment, Inc. Blasting apparatus, components thereof and related methods for use thereof
US5618177A (en) * 1995-05-08 1997-04-08 Dove Systems, Inc. Arrangement for feeding pressurized particulate material
US5556325A (en) * 1995-06-15 1996-09-17 Church & Dwight Co., Inc. Pressurization system for abrasive supply pot

Also Published As

Publication number Publication date
ATE419092T1 (de) 2009-01-15
EP1652621A4 (fr) 2007-03-28
WO2004101224A1 (fr) 2004-11-25
WO2004101224A8 (fr) 2006-03-09
EP1652621A1 (fr) 2006-05-03
DE502004008784D1 (de) 2009-02-12
RU2248871C2 (ru) 2005-03-27

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