US2696910A - Method and apparatus for separating waste particles from media used in sandblasting - Google Patents

Method and apparatus for separating waste particles from media used in sandblasting Download PDF

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US2696910A
US2696910A US97622A US9762249A US2696910A US 2696910 A US2696910 A US 2696910A US 97622 A US97622 A US 97622A US 9762249 A US9762249 A US 9762249A US 2696910 A US2696910 A US 2696910A
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sand
air
tube
medium
chamber
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US97622A
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Ljungdell Erik Ragnar
Krantz Karl Gustav Evert
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Svenska Flaktfabriken AB
Saab Bofors AB
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Svenska Flaktfabriken AB
Bofors AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/006—Treatment of used abrasive material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • blast media is used to indicate the blasting media, it being understood that the term is intended to include all kinds of blast media used.
  • Compressed air is the usual driving force for the sand but this force can be replaced by mechanical or other means which throw the sand against the object to be treated, itbeing pointed out that the use of the term blast media is not limited to compressed air, but can also comprise media other than compressed air.
  • the sand is discharged by means of compressed air or centrifugal forces with great speed from a device against the objects which are to be cleansed or treated in any other way. Then, in both cases, the sand will be mixed with particles removed from the objects or from the sand itself. For economical reasons the sand has to be collected and used once more, when the deteriorations have been removed to the greatest possible extent.
  • the dust consists of fine particles of burnt molding sand and scales and fragments of worn-out grains of sand.
  • the dust causes decreasing efficiency of the blast and, further, the dust is unhealthy and complicates the blasting as it makes it difiicult to observe the piece worked on and to judge the result of the blasting during the work.
  • the present invention provides a new possibility of cleansing the sand from dust, which in practice makes the blasting operation more efiicient and healthy and also makes the use of the sand more economical, as the cleansing of the sand, for instance, can be carried out continuously.
  • the method is based on mixing an air current with a current of the cleansing medium, so that the air current meets the current of the sand and changes the direction of those particles, which are to be separated.
  • the speed and direction of the air current is then adjusted so'that the difference in the moving energy between the particles-0f different size and weight is made use of when changing the direction of movement of the particles to be separated, whilst the necessary particles above a certaln size are not affected.
  • the separation .a hole 34 therein.
  • Fig. 1 shows schematically a blast arrangement with the cleansing arrangements for the sand and the air; and Fig. 2 shows a horizontal view of the blast cabinet in greater scale.
  • 1 is the sand blast cabinet and 2 indicates the blast worker
  • 3 is a blast pipe and 4 represents castings to be blasted, placed on a car 5.
  • the car is resting on a rotatable disc 6, which is driven by an electrical motor 8 by means of a change speed gear 7. While the disc 6 is slowly rotated, the jet with the blast medium is directed at the objects 4 cleansing the objects.
  • Reference numeral 9 indicates an exhausting opening for the air mixed with dust, which is produced in the blast cabinet 1 and 10 indicates a suction duct to the dust separator 11, which is of so called tube-filter type.
  • 12 is a dust container for gathering the dust separated from the dust separator 11 and 13 is an outlet for the separated dust from container 12.
  • 14 is a suction fan or any other suction-apparatus for withdrawing cleansed air from the dust separator 11.
  • 15 indicates an electrical motor for driving the fan 14 and 16 indicates an exhaust nozzle for the cleansed air.
  • the revolving disc 6 is provided with apertures 17, through which the blast medium together with the impurities in the form of slag, scales, burned sand and the like descends to a chamber 18, in which a screwconveyor 20, driven by the motor 19, convey the contaminated medium to the pocket 21.
  • a screwconveyor 20 driven by the motor 19 conveys the contaminated medium to the pocket 21.
  • This conveyor is of known type and brings the material to the tipping chute 24, from which the material falls down into a rotating sifting drum 25, driven by an electrical motor 26.
  • the sifter 25 is so arranged that the sand and smaller particles can pass the holes or meshes of the sifter and fall down in the shoot 27, while larger particles as spikes etc. pass in the axial direction through the shifting drum 25 and are tipped through the outlet opening 28'.
  • the real purifying arrangement according to the invention consists, in addition to the tube or plunge tube 27, of a vertical pipe or tube 29.
  • the tube 29 has a lower open end 30 and likewise an open upper end '31 between which the pipe 27 connects.
  • the lower part of the end 30 is enclosed by and opens into a low pressure chamber 32 provided witha conical bottom 33 having The hole 34 co-operates with a lock valve 35 which conveniently is springloaded.
  • a pressure fan 36 which introduces fresh air in the chamber 32.
  • the fan 36 is driven by an electrical motor not shown.
  • the tube end 30 has a side wall 37, which is adjustable so that the free flowing area of the tube end may be increased or decreased.
  • the side Wall 37 is provided with an outer flange 38 having slots 39 for bolts (not shown) arranged in the wall 40 constituting a fixed part of the chamber 32.
  • the side wall 37 is thus displaceable along the slots and is fastened in different positions by means of bolts and nuts.
  • the contaminated sand falling down through the plunge tube 27 meets a stream of air from the fan 36 in the tube end 30, the force and velocity of the air being adjusted to carry away the impurities in the sand but not the sand itself (the cleansing medium) and conveys these impurities out 3 through the upper pipe end 31 to a dust separator 41.
  • the cleansing medium or the sand falls down into the chamber 32 and is collected there in a substantially clean condition.
  • the dust separator 41 consists of a hose filter the lower chamber 42 of which receives the separated deteriorations, falling down from said chamber into transportable dust containers 43.
  • the purified air passing through the filter hoses 44 is exhausted by suction by means of afan 45, driven by an electrical motor 46, and continues through a pipe 47.
  • a valve 48 is arranged, regulated by a motor 49 for a pressure regulator 50 for regulatingv the velocity of air.
  • the pressure regulator 50 is used for regulating the air velocity in the tube end 30. It is important that the fan always exhausts more air than isforced in by the The difference in air volume is taken in through the opening 28 and the pipe 27.
  • the regulator 50 opens and shuts the valve 48- in dependence on the choking of the hose filters 44 in such a way that the valve 43 is opened more by increased choking of the filter 44 and is powerfully throttled by newly cleaned filters 44.
  • the purified air in the tube 47 is led to the blasting chamber 1 and is distributed by a tube 51 to special nozzles 52, which constitute an air curtain of blown air in the blast chamber as a protection for the blast operator 2 against the whirling dust and sand in the chamber 1.
  • a throttle 53 in the tube 47 regulates the quantity of air to the tube 51.
  • the surplus of air is led into a shunt 54, which is connected to the tube 10. As air is exhausted from the chamber 1 through the tube 10, it is necessary to prevent the evacuation of the chamber 1.
  • the chamber is therefore provided with openings 551, which admit air from out side the chamber into the chamber 1.
  • the valve 35 can be air pressure loaded. In the latter case a compressed air duct 57 is drawn over a valve 58 and a duct 59 into the chamber 55. Then the air pressure in the chamber must be higher than in the chamber 32.
  • the valve 58 is controlled by a bar 60 for the passing on the air partly to the duct 59 and partly to a shunt 61 from same, leading to the blast jet 3.
  • the shunt or duct 61 goes through a high pressure ejector 62, connected to the bottom of the chamber 55, through which the air current in duct 61 transports the steel sand or other purified cleansing medium from the chamber 55 and ejects this through the blast jet 3.
  • the blaster 2 is placed in a separate part of the blast chamber 1, to which there is a direct door 63, whilst the truck 5 is led into the blast chamber box through an opening, which is shut by the doors 64 and 65.
  • the steps which comprise introducing a stream of waste sand blasting medium into a chamber located between a lower zone maintained at a predetermined pressure above atmospheric and an upper zone maintained at suction pressure, causing a current of air under predetermined positive pressure to pass through said chamber from said lower zone to said upper zone at a predetermined veloc- 35 ity in a direction to engage and pass through said stream of waste blast medium to entrain and carry off to the upper zone the waste particles in the medium having a size and weight less than the sand particles of the medium which are caused to pass into the lower zone, filtering from the current of air in the suction zone the entrained waste particles, and regulating the suction pressure at the downstream side of the filter in correspondence to the degree of blockage of the filter to maintain substantially constant the velocity of the current of air passing through said chamber.
  • a generally upstanding tube having intermediate its ends an inlet for a stream of waste sand blast medium, means including an exhaust fan to create a suction pressure zone at the end of the tube above said inlet, blower means to maintain air under positive pressure at the lower end of the tube to cause a stream of air to pass continuously upward through said tube at a predetermined velocity and through the stream of waste sand medium to entrain and carry off therewith to the suction zone the waste particles in the medium having a size and weight less than the sand particles of the medium which pass downwardly in the tube, filter means in the path of travel of the air stream through said suction zone operable to remove from the air stream the entrained waste particles, and means to control said exhaust fan and thereby regulate the suction pressure at the downstream side of said filter in correspondence to the degree of blockage thereof to maintain substantially constant the velocity of the stream of air passing through said tube.
  • means for separating waste particles from sand and like media used in sand blasting, means defining an operating station having an opening of substantial size confronting the zone in which work is sand blasted, a generally upstanding tube adjacent said sand blast work zone and having intermediate its ends an inlet for a stream of waste sand blast medium, means including an exhaust fan to create a suction pressure zone at the end of the tube above said inlet, blower means to maintain air under positive pressure at the lower end of the tube to cause a stream of air to pass continuously upward through said tube at a predetermined velocity and through the stream of waste sand medium to entrain and carry off therewith to the suction zone the waste particles in the medium having a size and weight less than the sand particles of the medium which pass downwardly in the tube, filter means in the path of travel of the air stream through said suction zone operable to remove from the air stream the entrained waste particles, means to control said exhaust fan and thereby regulate the suction pressure at the downstream side of said filter in correspondence to the degree
  • a separating chamber comprising a tubular member having an upper portion defining a suction zone and a lower portion defining a positive pressure zone, means to create a suction pressure in the upper portion of the tubular member, means to maintain a positive pressure in the lower portion of said tubular member and cause a stream of air to pass continuously upward through said tube at a predetermined velocity, inlet means for a stream of waste sandblast medium opening angularly downward into said tubular member intermediate said upper and lower portions thereof and having a rounded wall surface connecting the adjacent portions of the inlet and the upper portion of the tubular member, said inlet introducing the waste medium counter to the flow of said air stream to cause the latter to entrain and carry to and through the suction zone of the tubular member the waste particles in said medium of less than a predetermined size and weight, means to reclaim the waste sandblast medium from the sandblast apparatus and deliver same to said inlet means, means mounting a section of the wall of the lower portion of the tub

Description

Dec. 14, 1954 METHOD Filed June 7, 1949 E. R. LJUNGDELL. ET AL AND APPARATUS FOR SEPARATING WASTE PARTICLES FROM MEDIA USED IN SAND BLASTING 2 Sheets-Sheet 1 lNVENTORS ERIK RAGNAB LJUNGDELL KARL GUSTAV EVERT KRANTZ ATTYS.
D 1954 E. R. LJUNGDELL ET AL 2,696,910
METHOD AND APPARATUS FOR SEPARATING WASTE PARTICLES FROM MEDIA USED IN SAND BLASTING Filed June 7, 1949 2 Sheets-Sheet 2 FIG. 2
INVENTORS 5am RAGNAR LJUNGDELL KARL GUSTAV EVERT KRAN'TZ ATTYS.
United States Patent METHOD AND APPARATUS FOR SEPARATING WASTE PARTICLES FROM MEDIA USED IN SANDBLASTING Erik Ragnar Ljungdell, Bofors, Karlskoga, and Karl Gustav Evert Krantz, Stockholm, Sweden, assignors to AB Svenska Flaktfabriken, Stockholm, Sweden, and AB Bofors, Bofors, Karlskoga, Sweden Application June 7, 1949, Serial No. 97,622
Claims priority, application Sweden June 9, 1948 Claims. '(Cl. 209-139) The reason for blasting a surface, however, is not always for cleansing purposes, but blasting is also used to improve the surface qualities by bombarding the surface by for instance shots or other media.
In the following the word sand is used to indicate the blasting media, it being understood that the term is intended to include all kinds of blast media used. Compressed air is the usual driving force for the sand but this force can be replaced by mechanical or other means which throw the sand against the object to be treated, itbeing pointed out that the use of the term blast media is not limited to compressed air, but can also comprise media other than compressed air.
In the cases described above the sand is discharged by means of compressed air or centrifugal forces with great speed from a device against the objects which are to be cleansed or treated in any other way. Then, in both cases, the sand will be mixed with particles removed from the objects or from the sand itself. For economical reasons the sand has to be collected and used once more, when the deteriorations have been removed to the greatest possible extent.
With cleansing sand, which has been used for blasting of cast steel, it has proved impossible to separate the main part of the fine dust from the blast media by the methods available. Consequently, the quantity of fine dust usually increases in proportion to the time during which the sand has been used. This has made it necessary to take away the circulating sand now and then from the circulating system of the cleansing apparatus, in order to let it pass a separate treatment, in order to remove the dust, when the proportion of same is too high. This involves expenses and loss of time in the production. In this case the dust consists of fine particles of burnt molding sand and scales and fragments of worn-out grains of sand. Among other things the dust causes decreasing efficiency of the blast and, further, the dust is unhealthy and complicates the blasting as it makes it difiicult to observe the piece worked on and to judge the result of the blasting during the work.
The present invention provides a new possibility of cleansing the sand from dust, which in practice makes the blasting operation more efiicient and healthy and also makes the use of the sand more economical, as the cleansing of the sand, for instance, can be carried out continuously. The method is based on mixing an air current with a current of the cleansing medium, so that the air current meets the current of the sand and changes the direction of those particles, which are to be separated. The speed and direction of the air current is then adjusted so'that the difference in the moving energy between the particles-0f different size and weight is made use of when changing the direction of movement of the particles to be separated, whilst the necessary particles above a certaln size are not affected. The separation .a hole 34 therein.
2,696,910 Patented Dec. 14, 1954- ICC might then be made in a section of the conveying system of the cleansing apparatus for the cleansing medium, so that the cleansing apparatus can work continuously with a circulating cleansing medium.
From experiments on technical scale on operating conditions with a sand blast apparatus, which worked with a quantity of steel sand of kg. per minute, it has been found that all dust particles with a particle size smaller than 640a (0.64 mm.) could be separated from the steel sand by the use of the new cleansing method. The quantity of collected dust was about 9% of the weight of the steel sand.
The method of cleansing the sand will now be described with reference to the drawings attached hereto, showing an embodiment of an arrangement according to the invention.
Fig. 1 shows schematically a blast arrangement with the cleansing arrangements for the sand and the air; and Fig. 2 shows a horizontal view of the blast cabinet in greater scale.
Referring to the drawings, 1 is the sand blast cabinet and 2 indicates the blast worker, 3 is a blast pipe and 4 represents castings to be blasted, placed on a car 5. The car is resting on a rotatable disc 6, which is driven by an electrical motor 8 by means of a change speed gear 7. While the disc 6 is slowly rotated, the jet with the blast medium is directed at the objects 4 cleansing the objects. Reference numeral 9 indicates an exhausting opening for the air mixed with dust, which is produced in the blast cabinet 1 and 10 indicates a suction duct to the dust separator 11, which is of so called tube-filter type. 12 is a dust container for gathering the dust separated from the dust separator 11 and 13 is an outlet for the separated dust from container 12. 14 is a suction fan or any other suction-apparatus for withdrawing cleansed air from the dust separator 11. 15 indicates an electrical motor for driving the fan 14 and 16 indicates an exhaust nozzle for the cleansed air.
The revolving disc 6 is provided with apertures 17, through which the blast medium together with the impurities in the form of slag, scales, burned sand and the like descends to a chamber 18, in which a screwconveyor 20, driven by the motor 19, convey the contaminated medium to the pocket 21. In this pocket 21 the medium is seized and is lifted by an endless bandconveyor 23 provided with scoops 22. This conveyor is of known type and brings the material to the tipping chute 24, from which the material falls down into a rotating sifting drum 25, driven by an electrical motor 26. The sifter 25 is so arranged that the sand and smaller particles can pass the holes or meshes of the sifter and fall down in the shoot 27, while larger particles as spikes etc. pass in the axial direction through the shifting drum 25 and are tipped through the outlet opening 28'.
The real purifying arrangement according to the invention consists, in addition to the tube or plunge tube 27, of a vertical pipe or tube 29. The tube 29 has a lower open end 30 and likewise an open upper end '31 between which the pipe 27 connects. The lower part of the end 30 is enclosed by and opens into a low pressure chamber 32 provided witha conical bottom 33 having The hole 34 co-operates with a lock valve 35 which conveniently is springloaded. To the low pressure chamber 32 is connected a pressure fan 36, which introduces fresh air in the chamber 32. The fan 36 is driven by an electrical motor not shown. The tube end 30 has a side wall 37, which is adjustable so that the free flowing area of the tube end may be increased or decreased. For this purpose the side Wall 37 is provided with an outer flange 38 having slots 39 for bolts (not shown) arranged in the wall 40 constituting a fixed part of the chamber 32. The side wall 37 is thus displaceable along the slots and is fastened in different positions by means of bolts and nuts.
When the fan 36 is in operation the contaminated sand falling down through the plunge tube 27 meets a stream of air from the fan 36 in the tube end 30, the force and velocity of the air being adjusted to carry away the impurities in the sand but not the sand itself (the cleansing medium) and conveys these impurities out 3 through the upper pipe end 31 to a dust separator 41. The cleansing medium or the sand on the other hand falls down into the chamber 32 and is collected there in a substantially clean condition.
The dust separator 41 consists of a hose filter the lower chamber 42 of which receives the separated deteriorations, falling down from said chamber into transportable dust containers 43. The purified air passing through the filter hoses 44 is exhausted by suction by means of afan 45, driven by an electrical motor 46, and continues through a pipe 47. In the pipe 47 a valve 48 is arranged, regulated by a motor 49 for a pressure regulator 50 for regulatingv the velocity of air. The pressure regulator 50 is used for regulating the air velocity in the tube end 30. It is important that the fan always exhausts more air than isforced in by the The difference in air volume is taken in through the opening 28 and the pipe 27. The regulator 50 opens and shuts the valve 48- in dependence on the choking of the hose filters 44 in such a way that the valve 43 is opened more by increased choking of the filter 44 and is powerfully throttled by newly cleaned filters 44. j The purified air in the tube 47 is led to the blasting chamber 1 and is distributed by a tube 51 to special nozzles 52, which constitute an air curtain of blown air in the blast chamber as a protection for the blast operator 2 against the whirling dust and sand in the chamber 1. A throttle 53 in the tube 47 regulates the quantity of air to the tube 51. The surplus of air is led into a shunt 54, which is connected to the tube 10. As air is exhausted from the chamber 1 through the tube 10, it is necessary to prevent the evacuation of the chamber 1. The chamber is therefore provided with openings 551, which admit air from out side the chamber into the chamber 1.
Under the chamber 32 there is a high pressure chamber 55, in whichv the cleansed steel sand or the cleansing medium 56 is collected in order to be conveyed from there by means of compressed air to the blast jet 3. If the valve is spring-loaded it keeps the opening 34 closed until the weight of the steel sand conteracts the spring and opens the valve 35, when the sand falls down into the chamber 55. Alternatively the valve 35 can be air pressure loaded. In the latter case a compressed air duct 57 is drawn over a valve 58 and a duct 59 into the chamber 55. Then the air pressure in the chamber must be higher than in the chamber 32. The valve 58 is controlled by a bar 60 for the passing on the air partly to the duct 59 and partly to a shunt 61 from same, leading to the blast jet 3. The shunt or duct 61 goes through a high pressure ejector 62, connected to the bottom of the chamber 55, through which the air current in duct 61 transports the steel sand or other purified cleansing medium from the chamber 55 and ejects this through the blast jet 3. The blaster 2 is placed in a separate part of the blast chamber 1, to which there is a direct door 63, whilst the truck 5 is led into the blast chamber box through an opening, which is shut by the doors 64 and 65.
While in the foregoing a preferred embodiment of the invention has been described and shown it is to be understood that the method and. arrangement is susceptible of any alterations and modifications which fall within the scope of the appended claims. The current of air, which,
is directed against the cleansing medium to be purified,
thus ought not to be directed exactly against the movement direction of the cleansing medium. It is important that each current has a direction deviating from that of the other one, so that when the currents meet, the air current can pass through the current of the cleansing A medium and from this can blow away through a convenient outlet such impurities, which as regards its mass are of such a light character that these deteriorations, but not the cleaning medium, are separated from the current Having now described our invention, what we claim as new, and desire to secure by United States Letters Patent, is:
1. In the method of separating dust and other waste particles from sand and like media used in sand blasting,
the steps which comprise introducing a stream of waste sand blasting medium into a chamber located between a lower zone maintained at a predetermined pressure above atmospheric and an upper zone maintained at suction pressure, causing a current of air under predetermined positive pressure to pass through said chamber from said lower zone to said upper zone at a predetermined veloc- 35 ity in a direction to engage and pass through said stream of waste blast medium to entrain and carry off to the upper zone the waste particles in the medium having a size and weight less than the sand particles of the medium which are caused to pass into the lower zone, filtering from the current of air in the suction zone the entrained waste particles, and regulating the suction pressure at the downstream side of the filter in correspondence to the degree of blockage of the filter to maintain substantially constant the velocity of the current of air passing through said chamber.
2. in apparatus for separating waste particles from sand and like media used in sand blasting, a generally upstanding tube having intermediate its ends an inlet for a stream of waste sand blast medium, means including an exhaust fan to create a suction pressure zone at the end of the tube above said inlet, blower means to maintain air under positive pressure at the lower end of the tube to cause a stream of air to pass continuously upward through said tube at a predetermined velocity and through the stream of waste sand medium to entrain and carry off therewith to the suction zone the waste particles in the medium having a size and weight less than the sand particles of the medium which pass downwardly in the tube, filter means in the path of travel of the air stream through said suction zone operable to remove from the air stream the entrained waste particles, and means to control said exhaust fan and thereby regulate the suction pressure at the downstream side of said filter in correspondence to the degree of blockage thereof to maintain substantially constant the velocity of the stream of air passing through said tube.
3. Apparatus as claimed in claim 2 wherein a section of the wall of the tube portion below the waste stream inlet is mounted for sliding adjustment in a direction normal to the tube axis to vary the free flow area through said portion.
4. in apparatus for separating waste particles from sand and like media used in sand blasting, means defining an operating station having an opening of substantial size confronting the zone in which work is sand blasted, a generally upstanding tube adjacent said sand blast work zone and having intermediate its ends an inlet for a stream of waste sand blast medium, means including an exhaust fan to create a suction pressure zone at the end of the tube above said inlet, blower means to maintain air under positive pressure at the lower end of the tube to cause a stream of air to pass continuously upward through said tube at a predetermined velocity and through the stream of waste sand medium to entrain and carry off therewith to the suction zone the waste particles in the medium having a size and weight less than the sand particles of the medium which pass downwardly in the tube, filter means in the path of travel of the air stream through said suction zone operable to remove from the air stream the entrained waste particles, means to control said exhaust fan and thereby regulate the suction pressure at the downstream side of said filter in correspondence to the degree of blockage thereof to maintain substantially constant the velocity of the stream of air passing through said tube, and means to discharge the filtered air under positive pressure as a protective curtain in the opening of said operating station.
5. In sandblast apparatus, a separating chamber comprising a tubular member having an upper portion defining a suction zone and a lower portion defining a positive pressure zone, means to create a suction pressure in the upper portion of the tubular member, means to maintain a positive pressure in the lower portion of said tubular member and cause a stream of air to pass continuously upward through said tube at a predetermined velocity, inlet means for a stream of waste sandblast medium opening angularly downward into said tubular member intermediate said upper and lower portions thereof and having a rounded wall surface connecting the adjacent portions of the inlet and the upper portion of the tubular member, said inlet introducing the waste medium counter to the flow of said air stream to cause the latter to entrain and carry to and through the suction zone of the tubular member the waste particles in said medium of less than a predetermined size and weight, means to reclaim the waste sandblast medium from the sandblast apparatus and deliver same to said inlet means, means mounting a section of the wall of the lower portion of the tubular member below the waste medium inlet for movement radially of the tube to thereby selectively adjust the free flow area of the lower portion of the tubular member, means including a filter for recirculating the separated medium from the suction zone of the tubular member to the sandblast apparatus, and means to regulate the suction pressure in the upper portion of the tubular member in correspondence to the degree of blockage of the filter to maintain substantially constant the velocity of the air stream passing through said tubular member.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 312,333 Crow Feb. 17, 1885 513,123 Marmon Jan. 23, 1894 519,958 Huefiner et a1. May 15,1894
Number Number Name Date Zoller May 29, 1906 Gray June 23, 1908 Davis Apr. 23, 1918 Plaisted July 9, 1918 Stebbins Jan. 6, 1925 Stebbins Apr. 12, 1927 Stebbins Apr. 17, 1928 Hull Apr. 23, 1929 McLean Apr. 19, 1932 'Piek Nov. 1, 1932 Lechthaler et a1. June 10, 1947 La Pointe Aug. 31, 1948 FOREIGN PATENTS Country Date Germany July 4, 1911 Germany July 4, 1935
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US3398829A (en) * 1967-02-17 1968-08-27 Du Pont Apparatus for separating adulterants during pneumatic conveying
US3769752A (en) * 1970-11-11 1973-11-06 Blastmaster Co Tekology Ltd Apparatus for shot blasting work members
US3848815A (en) * 1972-05-17 1974-11-19 Carborundum Co Granulating apparatus
US3894359A (en) * 1973-01-18 1975-07-15 Voest Ag Device for cleaning steelworks molds
US4010096A (en) * 1975-10-09 1977-03-01 Allis-Chalmers Corporation Pneumatic classifier for refuse material with adjustable air intake
US4523988A (en) * 1983-08-18 1985-06-18 Apache Equipment, Inc. Apparatus and method for producing virgin and/or reclaiming used abrasives
US4723378A (en) * 1987-02-24 1988-02-09 Progressive Blasting Systems, Inc. Exhaust and reclaim system for blasting enclosures
EP0291707A2 (en) * 1987-05-16 1988-11-23 FRIEDRICH GOLDMANN GMBH & CO. Sandblast cabinet
EP0502461A1 (en) * 1991-03-04 1992-09-09 FORACON MASCHINEN- UND ANLAGEN GmbH Method and apparatus for the recovery of abrasive material in a water-jet cutting operation
US5195640A (en) * 1992-03-03 1993-03-23 Seaverns Glenn A Method and apparatus for cleaning abrasive blast media
FR2684570A1 (en) * 1991-12-06 1993-06-11 Media First Sarl Cleaning (scouring) installation using pressure
US5233796A (en) * 1992-12-10 1993-08-10 Mazalewski Jr Robert J Mobile containerized sandblasting multi-unit
EP1003003A2 (en) * 1998-11-18 2000-05-24 Zander Umwelt GmbH Grinding room arrangement to install in a building
US6299667B1 (en) * 1998-12-19 2001-10-09 Kf Strahltechnik Dresden Method and device for removing dust from areas with high dust loading
US20070218816A1 (en) * 2006-03-17 2007-09-20 Hitachi Plant Technologies, Ltd. Blasting medium picking-apart device
US20110034119A1 (en) * 2009-08-10 2011-02-10 Fuji Manufacturing Co., Ltd Blasting Chamber
CN105773436A (en) * 2016-05-09 2016-07-20 西安合力汽车配件有限公司 Sand sweeping system of production line
EP4029649A1 (en) * 2021-01-19 2022-07-20 Eisenwerk Würth GmbH Device for treating a surface of a workpiece with a blasting agent

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US2771189A (en) * 1952-11-08 1956-11-20 Pangborn Corp Work blasting apparatus
US2935820A (en) * 1957-10-22 1960-05-10 William H Mead Air-solids separation system for blast room
US3398829A (en) * 1967-02-17 1968-08-27 Du Pont Apparatus for separating adulterants during pneumatic conveying
US3769752A (en) * 1970-11-11 1973-11-06 Blastmaster Co Tekology Ltd Apparatus for shot blasting work members
US3848815A (en) * 1972-05-17 1974-11-19 Carborundum Co Granulating apparatus
US3894359A (en) * 1973-01-18 1975-07-15 Voest Ag Device for cleaning steelworks molds
US4010096A (en) * 1975-10-09 1977-03-01 Allis-Chalmers Corporation Pneumatic classifier for refuse material with adjustable air intake
US4523988A (en) * 1983-08-18 1985-06-18 Apache Equipment, Inc. Apparatus and method for producing virgin and/or reclaiming used abrasives
US4723378A (en) * 1987-02-24 1988-02-09 Progressive Blasting Systems, Inc. Exhaust and reclaim system for blasting enclosures
EP0291707A2 (en) * 1987-05-16 1988-11-23 FRIEDRICH GOLDMANN GMBH & CO. Sandblast cabinet
EP0291707A3 (en) * 1987-05-16 1990-03-14 Goldmann Friedrich Gmbh & Co Sandblast cabinet
EP0502461A1 (en) * 1991-03-04 1992-09-09 FORACON MASCHINEN- UND ANLAGEN GmbH Method and apparatus for the recovery of abrasive material in a water-jet cutting operation
FR2684570A1 (en) * 1991-12-06 1993-06-11 Media First Sarl Cleaning (scouring) installation using pressure
US5195640A (en) * 1992-03-03 1993-03-23 Seaverns Glenn A Method and apparatus for cleaning abrasive blast media
US5233796A (en) * 1992-12-10 1993-08-10 Mazalewski Jr Robert J Mobile containerized sandblasting multi-unit
EP1003003A2 (en) * 1998-11-18 2000-05-24 Zander Umwelt GmbH Grinding room arrangement to install in a building
EP1003003A3 (en) * 1998-11-18 2003-05-21 Zander Umwelt GmbH Grinding room arrangement to install in a building
US6299667B1 (en) * 1998-12-19 2001-10-09 Kf Strahltechnik Dresden Method and device for removing dust from areas with high dust loading
US20070218816A1 (en) * 2006-03-17 2007-09-20 Hitachi Plant Technologies, Ltd. Blasting medium picking-apart device
US7543769B2 (en) 2006-03-17 2009-06-09 Hitachi Plant Technologies, Ltd. Blasting medium picking-apart device
US20110034119A1 (en) * 2009-08-10 2011-02-10 Fuji Manufacturing Co., Ltd Blasting Chamber
CN105773436A (en) * 2016-05-09 2016-07-20 西安合力汽车配件有限公司 Sand sweeping system of production line
CN105773436B (en) * 2016-05-09 2018-06-29 西安合力汽车配件有限公司 A kind of production line returns sand system
EP4029649A1 (en) * 2021-01-19 2022-07-20 Eisenwerk Würth GmbH Device for treating a surface of a workpiece with a blasting agent

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