EP0059173A2 - Machine pour le nettoyage superficiel au jet abrasif d'objets de toute sorte - Google Patents

Machine pour le nettoyage superficiel au jet abrasif d'objets de toute sorte Download PDF

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Publication number
EP0059173A2
EP0059173A2 EP82830034A EP82830034A EP0059173A2 EP 0059173 A2 EP0059173 A2 EP 0059173A2 EP 82830034 A EP82830034 A EP 82830034A EP 82830034 A EP82830034 A EP 82830034A EP 0059173 A2 EP0059173 A2 EP 0059173A2
Authority
EP
European Patent Office
Prior art keywords
sand
tank
duct
water
machine according
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Withdrawn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
EP82830034A
Other languages
German (de)
English (en)
Other versions
EP0059173A3 (fr
Inventor
Pietro Assoni
Luciano Assoni
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.)
CISA SpA
Original Assignee
CISA SpA
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
Priority claimed from IT19854/81A external-priority patent/IT1135538B/it
Priority claimed from IT22237/81A external-priority patent/IT1137085B/it
Application filed by CISA SpA filed Critical CISA SpA
Publication of EP0059173A2 publication Critical patent/EP0059173A2/fr
Publication of EP0059173A3 publication Critical patent/EP0059173A3/fr
Withdrawn legal-status Critical Current

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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
    • B24C7/0084—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a mixture of liquid and gas
    • 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

Definitions

  • the present invention relates to a sandblasting machine suitable to carry out the superficial cleaning of any kind of objects, especially in the building field, for instance the cleaning of fagades of buildings, and in the heavy carpentry field, for instance in the car-bodies work, in the shipyard and similar ones.
  • the machine of the present invention is suitable to perform, by itself in autonomous way, without other equipments, the complete sandblasting cycle which begins with the proper sandblasting, that is the throwing of dry or wet sand on the surface to be clean and goes on to the final washing and drying operations of the surface.
  • the machine according to the present invention allows, therefore, to perform, besides the sandblasting, further operations for which subsidiary equipments are generally requested, with evident great drawbacks among which the expensive costs.
  • the machine according to the present invention allows to eliminate the drawbacks of the traditional sanders, as for instance the possibility to use normal quarry sand instead of more expensive quartzose sand and to re--use the sand already used.
  • the sandblasting machine in subject allows moreover the complete elimination of the powder which arises during the sandblasting as it is possible to use wet sand.
  • the sandblasting machine including an under-pressure tank containing the sand, connected to a feeding apparatus of compressed air and provided with an exit duct of the sand, is characterized by the fact that, between the under-pressure tank and the exit duct of the sand a sand ejection chamber is interposed, which receives the sand from the tank through a drilled diaphragm suitable to be closed and it is also connected with the feeding apparatus of the compressed air, pumping devices being provided for the inlet of the water inside the tank through a first duct provided with interception means, and at last a second duct being provided with interception means as well, for the inlet of water inside the compressed air feeding duct to the ejection chamber.
  • the sandblasting machine includes an under pressure tank, containing the sand, which consists of an essentially cylindrical body 1, provided in its upper part with a seal closing element or cover 2.
  • the cover 2 is provided centrally with a hole 3 for the inlet of the sand into the tank 1, in the direction of the arrow F.
  • the hole 3 is provided in known way with a closing valve 4 suitable to close the hole 3, when compressed air is let into the tank 1.
  • The. valve 4 consists in traditional way, of a bell-shaped substantially conical element 5 having its apex turned upward and its taper larger than the opening of the hole 3.
  • a cylindrical sleeve 6 is fastened, for instance by welding, and it is sliding upon an essentially tubular body 7 integral with the end of a duct 8 through which compressed air is let into the tank 1.
  • the duct 8 is connected by a fitting 9 to another tubular piece 10, which is connected by a duct 11 with a compressed air feeding apparatus not shown the air being fed according to the direction of the arrow G.
  • a pressure gauge M is shunted by which the feeding pressure of the compressed air can be checked.
  • the tank 1 is provided, at its lower end with a chamber for the ejection of the sand, indicated in its whole by 13.
  • the ejection chamber 13 is embodied by an essentially cylindrical body 14 closed in its lower part and opened in its upper one, of which on the open base a diaphragm 15 is fixed, embodied by a disk having its diametersubstan- tially equal to the diameter of the outline of the open base of the body 14.
  • the diaphragm 15, as can be seen, also in Fig. 2, is provided with a hole 17 which connects the inside of the tank 1 with the inside of the ejection chamber 13 allowing the passage of the sand from the. tank into the said chamber.
  • the machine according to the invention includes means to close the hole 17 which consists in the illustrated embodiment of a disk-shaped element 18, shown also in Fig. 2 with dotted lines. It is fixed at the end of a Z-shaped operating rod 19 whose central part is seal revolving inside a sleeve 20 integral with the inner wall of the chamber 13. The end 19a of the rod 19 projects from the chamber 13 to allow the operating by the operator.
  • the element 18 can be placed, as shown in Fig. 2, directly below the hole 17, preventing the sand from passing from the tank 1 to the ejection chamber 13 or moved from this position, allowing, in that way, the sand pass into the chamber 13.
  • the compressed air feeding duct 11 estends below with a piece 21, whose end 21a bends downward with an exit mouth 21b of the air into the ejection chamber 13 of the sand.
  • the sand under the action of the air, gets out of the ejection chamber 13 through a duct 22, at whose end a known output nozzle (not shown) of the sand will be provided.
  • the machine In order to make easier the passage of the sand from the tank 1 to the ejection chamber through the hole 17, the machine according to the invention includes a rotor 23 fitted up with arms or radial vanes 24, which, during the rotation of the rotor 23, pushes the sand lying on the upper face of the diaphragm 15 towards the hole 17.
  • the action of the rotor 23 turns out particularly favour able when the sand is wet and, on that purpose, the control of the rotor operating is arranged preferably when this condition occurs.
  • the rotor 23 can be operated also when the sandblasting machine works with dry sand. The components of the machine will be adjusted on that purpose.
  • a motor-reducer 25 is fixed in whatever known way, which is embodied by a driving motor 26 and a known reduction unit 27 which has two shafts coming out, respectively 28 and 29.
  • the motor-reducer 25 operates, by the shaft 28, the rotations of the rotor 23; the shaft 28 in fact extends with a piece 30 which passes through the ejection chamber 13.
  • the motor-reducer 25 operates a pump 31, which provides the sandblasting machine with water, coming from a feeding station, not shown, according to the direction of the arrow T through a duct 32.
  • said delivery duct. 33 is fitted up with a known nonreturn valve 36 in order to assure the water reach, during the operating, the tank 1 or the duct 21.
  • the duct 33 by an offtake, parts at one side in the duct 34, joined by a known stop valve 37 with the tank 1 for the inlet of water in its inside. At the other side, the duct 33 extends in the second duct 35, fitted up, as well, with a known stop valve 38 which is connected with he duct 21.
  • a by-pass circuit is provided in order to allow anyhow the operating of the pump 31 and hence the water circulation even when the valves 37 and 38 are closed.
  • the by-pass which allows this working includes an offtake 39, which joints at one end with the delivery duct 33 and at the other end with the inlet duct 32, establishing in that way a closed ring inside which the water circulates in the above said conditions.
  • boost control valve 40 is profitably inserted which, in the working by wet sand, allows to adjust the pressure value of the inlet of water, which therefore results different from the pressure supplied by the pump 31.
  • This adjustement is important, as it is necessary constant ly to check the pressure of the water in comparison with the compressed air's one.
  • the loading of the sand in the tank 1 is made through the hole 3 when the compressed air is not supplied and therefore the bell-shaped element 5 is in its low position, separated from the hole 3, owing to the sleeve 6, which slides on the tubular portion 7.
  • the action of the compressed air will be such one as to cause the passage of the sand from the tank 1 into the ejection chamber 13 through the hole 17, which will be previously get free from the plugging disk 18.
  • the motor-reducer 25 can be started causing the rotation of the rotor 23.
  • all the valves 36, 37 and 38, which allow the feeding of the water are closed. Being the pump 31, working, the water will circulate in the by-pass 39, 32 and 33.
  • valves 36 and 37 When the stopping of this working is desired in order to work with wet sand, for instance to eliminate the powder and dust developped during the sandblasting, it is sufficient to open the valves 36 and 37 so that the water can enter the delivery duct 33 and, through the duct 34, it can be inlet into the tank 1.
  • valve 40 inserted in the by-pass, it is possible anyhow to adjust the feeding pressure of the water getting free its value from the value supplied by the pump 31.
  • the machine can easily be arranged as follows.
  • the user will provide to close the letting-in valve 37 of the water into the tank 1, to close the passage 17 disposing in front of it the disk-shaped element 18 by driving the lever 19.
  • valve 38 will be opened, allowing the letting in of water into the duct 21, which brings the compressed air into the ejection chamber 13 and in its inside therefore water under pressure arrives both because its own pressure and because the compressed air's one. Also in this stage of working it is possible, of course, to operate the adjusting valve 40 in order to adjust the pressure of the water.
  • the sandblasting machine according to the invention in its second embodiment, is particularly suitable to carry out the cleaning of metallic surfaces, and, therefore, for being used by a car body maker in the restoration and/or maintenance of a motor-vehicle.
  • the said cleaning is defective and it is made by means of emery papers, by the worker who scratches manually the deformed surface as far as possible.
  • the imperfect cleaning of the metallic surface prevents a proper application of the so called body stopper, by which the surface of the car body is smoothed before the painting.
  • the sandblasting machine in this second embodiment, with reference to Figs. 4. and 5, comprises a tank for the sand 1, which is provided, in its uppert part, with a hole for the inlet of the sand to which a shutter is joined, suitable to seal close said hole when compressed air is inlet into the tank 1 through a pipe 10 connected with an .adducting duct of compressed air 11, coming from a suitable feeding station according to the direction of the arrow G.
  • a pressure-gauge M for measuring the pressure of the air inlet into the tank 1 and an air valve S are provided on the feeding duct of the compressed air 11.
  • the tank la is connected, by a pipe 42 provided with an air valve 43, to the tank 1 so that, when the sand tank is put under pressure by feeding compressed air through the pipe 10, the water tank la is put under pressure as well.
  • the said water tank will be provided with a valve device 60 suitable to allow its filling with water before its setting under pressure.
  • the water tank la is provided in its lower part, with a pipe 44, fitted up with a known interception valve 45 for the inlet of water into a delivery duct 46 to which, as later on will be specificated, sand and water arrive as well.
  • the delivery duct 46 is provided at its end 22 with a not shown output nozzle, which is fit to allow the throwing of the mixture sand-water in the direction of the arrow.
  • the delivery duct 46 is connected, through a pipe 47, with the duct 11 bringing the compressed air, below the shunt 10 which inlets the said air into the tank 1.
  • a closing plate 15 is seal-fixed, which can be locked as specificated and shown with reference to the previously described embodiment, which is provided with a hole 17 for the coming out of the sand towards a T shunt 48 joining the pipe 47 bringing the compressed air with the delivery duct 46 and with a share of pipe 49 which receives the sand from the hole 17.
  • an hand operable shutter like that specificated in the application for the first embodiment, essentially embodied by a proper shutter device 18, fit to be placed or not, upon the hole 17, which is hold by a substantially S-shaped driving rod, whose central branch 19 is rotating inside a passing-by hole of the closing plate 15, by appropriate seal equipments.
  • the driving rod has a radialward projecting part 19a from the tank 1 for the operating of the shutting device 18.
  • a rotor 23 fitted up with radial arms or vanes is provided which during its rotation, push on the sand situated on the upper face of the plate 15, towards the hole 17.
  • At least one of the radial vanes 24 of the rotor 23 is provided with an appendix bended upward, substantially in contact with the inner truncated conical wall of the tank 1, marked 50, which is suitable to embody substantially a scraping device of the said surface for the removal of possibly stiked sand at this surface, bringing it, in this way, towards the bottom of the tank 1.
  • the operating of the machine, according to the invention is extremely simple.
  • a first the filling up of the sand tank 1 is provided and of the water l one la as well.
  • Compressed air is inlet through the duct 10, 11 into the tank 1 and through the shunt 42, the water tank la is set under pressure.
  • the shutting device 18 of the sand lies over the exit hole 17 and the valve 45 is closed.
  • valve 51 of the compressed air and the valve 45 of the water will be opened and the shutting device 18 will be displaced.
  • compressed air, water and sand are inlet in the delivery duct 46 and their flows can be adjusted by the respective valves;
  • the pressure of the compressed air may be simply the available one at any car-body maker's and he will not be obliged to purchase a special compressor generally more expensive than the sandblasting machine itself.
  • a final cleaning can be made at last, by closing the shutting device 18 too, inletting therefore into the delivery duct 46 only compressed air.
  • the piece 49 of the T shaped shunt, which connects the delivery compressed air is fitted up with a swelling so as to embody substantial ly a little chamber inside which the sand can expand before falling down in the delivery duct 46. This allows to obtain a limited turbulence of the sand and its uniform spreading in the duct 46.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP82830034A 1981-02-19 1982-02-18 Machine pour le nettoyage superficiel au jet abrasif d'objets de toute sorte Withdrawn EP0059173A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT1985481 1981-02-19
IT19854/81A IT1135538B (it) 1981-02-19 1981-02-19 Macchina sabbiatrice per la pulitura superficiale di superfici in genere
IT2223781 1981-06-10
IT22237/81A IT1137085B (it) 1981-06-10 1981-06-10 Macchina sabbiatrice particolarmente per superfici metalliche

Publications (2)

Publication Number Publication Date
EP0059173A2 true EP0059173A2 (fr) 1982-09-01
EP0059173A3 EP0059173A3 (fr) 1982-10-13

Family

ID=26327330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82830034A Withdrawn EP0059173A3 (fr) 1981-02-19 1982-02-18 Machine pour le nettoyage superficiel au jet abrasif d'objets de toute sorte

Country Status (2)

Country Link
EP (1) EP0059173A3 (fr)
ES (1) ES509776A0 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196279A (en) * 1986-10-17 1988-04-27 Rhoderick Jonathan Spenc Baker Pressurized blasting machine
EP0359701A2 (fr) * 1988-09-16 1990-03-21 Daniel Mattmann Procédé et dispositif de préparation et réutilisation de sable dans un procédé de sablage par l'eau à haute pression
DE4335382A1 (de) * 1993-10-16 1995-04-27 Pro Aqua Geraete Gmbh Strahlgerät
WO1999039874A1 (fr) * 1998-02-04 1999-08-12 Alfred Kärcher GmbH & Co. Pistolet ejecteur pour agent de grenaillage
WO2018055012A1 (fr) * 2016-09-20 2018-03-29 Duo Blast Equipment Limited Appareil conçu pour assurer un sablage à la fois humide et sec et procédé de mise en œuvre dudit appareil
CN108568756A (zh) * 2018-05-09 2018-09-25 中船澄西船舶修造有限公司 一种防堵塞的水雾磨料混合缸
CN115781529A (zh) * 2022-12-05 2023-03-14 中建安装集团黄河建设有限公司 一种罐体水喷砂除锈设备及方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR351641A (fr) * 1905-02-21 1905-07-21 Marine Construction Company Perfectionnements aux machines à jet de sable à air comprimé
US2409722A (en) * 1945-01-16 1946-10-22 Todd Shipyards Corp Sand blasting apparatus
FR2452358A1 (fr) * 1979-03-30 1980-10-24 Assoni Pietro Sableuse pour le nettoyage de surfaces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR351641A (fr) * 1905-02-21 1905-07-21 Marine Construction Company Perfectionnements aux machines à jet de sable à air comprimé
US2409722A (en) * 1945-01-16 1946-10-22 Todd Shipyards Corp Sand blasting apparatus
FR2452358A1 (fr) * 1979-03-30 1980-10-24 Assoni Pietro Sableuse pour le nettoyage de surfaces

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196279A (en) * 1986-10-17 1988-04-27 Rhoderick Jonathan Spenc Baker Pressurized blasting machine
GB2196279B (en) * 1986-10-17 1990-08-01 Rhoderick Jonathan Spenc Baker Pressurized blasting machine
EP0359701A2 (fr) * 1988-09-16 1990-03-21 Daniel Mattmann Procédé et dispositif de préparation et réutilisation de sable dans un procédé de sablage par l'eau à haute pression
EP0359701A3 (fr) * 1988-09-16 1990-05-30 Daniel Mattmann Procédé et dispositif de préparation et réutilisation de sable dans un procédé de sablage par l'eau à haute pression
DE4335382A1 (de) * 1993-10-16 1995-04-27 Pro Aqua Geraete Gmbh Strahlgerät
WO1999039874A1 (fr) * 1998-02-04 1999-08-12 Alfred Kärcher GmbH & Co. Pistolet ejecteur pour agent de grenaillage
WO2018055012A1 (fr) * 2016-09-20 2018-03-29 Duo Blast Equipment Limited Appareil conçu pour assurer un sablage à la fois humide et sec et procédé de mise en œuvre dudit appareil
US11548116B2 (en) 2016-09-20 2023-01-10 Flowtech International Ltd Apparatus configured to provide both wet and dry blasting and method for operating such an apparatus
CN108568756A (zh) * 2018-05-09 2018-09-25 中船澄西船舶修造有限公司 一种防堵塞的水雾磨料混合缸
CN115781529A (zh) * 2022-12-05 2023-03-14 中建安装集团黄河建设有限公司 一种罐体水喷砂除锈设备及方法
CN115781529B (zh) * 2022-12-05 2023-09-22 中建安装集团黄河建设有限公司 一种罐体水喷砂除锈设备及方法

Also Published As

Publication number Publication date
EP0059173A3 (fr) 1982-10-13
ES8304464A1 (es) 1983-03-01
ES509776A0 (es) 1983-03-01

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