US3918585A - Screen device for pneumatic transport equipment - Google Patents

Screen device for pneumatic transport equipment Download PDF

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US3918585A
US3918585A US396159A US39615973A US3918585A US 3918585 A US3918585 A US 3918585A US 396159 A US396159 A US 396159A US 39615973 A US39615973 A US 39615973A US 3918585 A US3918585 A US 3918585A
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screen
transfer pipe
source
air
screen device
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US396159A
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Clas Hjalmar Hagelstam
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Karl Fazer Oy AB
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Karl Fazer Oy AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/58—Devices for accelerating or decelerating flow of the materials; Use of pressure generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/06—Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves

Definitions

  • a screen device for fine-grain materials for use in 1 easrc '1 pneumatic transport equipment comprises H 13 2 3- screen means inside a transfer pipe and means in the 58 portion of said transfer pipe upstream of said screen means for blowing additional air into said transport [56] References Cited pipe.
  • the subject of the present invention is a screen device for fine-grain materials, such as flour, to be used in pneumatic transport equipment, which screen device consists of a screen arranged inside the transport pipe.
  • the known equipment described above is complicated and expensive, because it usually comprises two compressors, an intermediate tank with possible cyclone, and a feeding lock. Since the flour passes through the screen only by means of the force of gravitation, the screen area must be made very large in order to reach a satisfactory degree of passing through.
  • the present invention is based on the idea, according to which the blocking of the screen is prevented by making use of this phenomenon. This has been achieved in the screen device in accordance with the invention mainly so that the portion of the transfer pipe upstream of the screen has equipment for blowing additional air into the interior of the said portion.
  • FIG. 1 shows a schematic view of a pneumatic transport equipment
  • FIG. 2 shows a side view of the screen device in partial section.
  • FIG. 1 shows compressor 1 and the outgoing pneumatic transfer pipe 2, which is connected with a feeding lock 3 and a screen device 4.. Before the feeding lock a by-passing pipe 5 is branched from the transfer pipe to the screen device 4.
  • the screen device 4 consists of two funnels 6 and 7, placed one opposite the other, between which there is a screen 8.
  • the funnel 6 of the inlet direction has an annular air space 9, from which holes 10 in the funnel wall provide passage into the funnel.
  • the air space 9 is connected with the by-passing pipe 5 through a cock 11.
  • the transport equipment operates as follows:
  • the compressor 1 feeds air, for example at an overpressure of 1 kg per square cm, into the transfer pipe 2, into which the material to be transferred is at the same time also being fed from the feeding lock 3.
  • the material passes into the screen device 4, in which air as added into same by means of the by-passing pipe 5, the air space 9 and the holes 10.
  • the material is fluidized and sufficiently small particles easily pass through the screen 8 without blocking it.
  • Particles larger than the mesh of the screen remain in the funnel 6 and can be removed by providing the pipe 2 with two screen devices 2, arranged in parallel (not shown) and which are alternatingly connected to the pipe. When one screen device is connected to the pipe, the other one is at the emptying pipe for removal of the large particles from the screen device. In such a case the transfer of flour need not be interrupted during cleaning of the screen devices.
  • the larger particles collected in the screen can be removed through a removal pipe provided with a blocking plate. This can take place always when material is not being transferred in the pneumatic transport equipment, thus, for example, after the transfer of the contents of each container of a truck if transfer of flour from a transport truck into a tank is concerned.
  • additional air can be introduced in the funnel 6 in many ways, for example through a nozzle introduced in the funnel or through a porous wall that allows air to pass through and that is positioned at the holes 10.
  • the emptying can, moreover, be made automatic by combining the operation of the feeding lock 3 with the operation of the locking plate of the removal pipe as con trolled by a clock or by a tachometer.
  • the funnels 6 and 7 have the shape of a funnel, but they can be, for example, straight pipes whose diameter is constant.
  • a screen device for fine-grain materials, especially flour, to be used in pneumatic transport equipment comprising:
  • a transfer pipe connected to said source of pneumatic pressure; means connected to said transfer pipe for feeding said material into said transfer pipe in order to transport said material along the pipe entrained in a flow of air from said source;
  • stationary means connected to a source of compressed air and defining an array of small apertures, which array extends completely around the interior ofa portion of the transfer pipe located immediately upstream of the screen to form a multiplicity of small, closely spaced air streams in order to mix effectively substantially all of said fine-grain material moving towards said screen with the air of said streams thereby to fluidize the fine-grain material, the pressure of the air of the streams being substantially the same as the transport pressure of said flow of air.
  • a screen device in accordance with claim 1, wherein the stationary means include means defining an annular air space which surrounds said portion of the transfer pipe and is connected to said source of compressed air.
  • apertures are formed in a wall of said portion and communicate with said annular air space.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

A screen device for fine-grain materials for use in pneumatic transport equipment. The device comprises screen means inside a transfer pipe and means in the portion of said transfer pipe upstream of said screen means for blowing additional air into said transport pipe.

Description

United States Patent 11 1 Hagelstam 1 Nov. 11, 1975 [5 SCREEN DEVICE FOR PNEUMATIC 550911 12/1895 Fell 209/250 x EQUIPMENT 1 i892: 7121; fizz/328::
Q {1T5 1 1 .1 -2 Inventor: 1 Hjalmar Hagelstam, Helsinki 1.272.682 7/1918 Lenders 1 209/134 x Finland 1530,19 3/1925 Montgomen 09/250 X 1.573.373 2/1926 (22.. 11 1 209/250 X [73] Asslgnee: 3' Karl HelsmkL 2874.840 2/1959 51111212011 09/262 x Fmland 2.910731 11/1959 Moore 1. 209/250 x 2 Filed: Sept. 11 1973 3354.766 6/1966 Anderson 209/250 X 3685.651 8/1972 Gruher 209/133 1211 Appl. No.: 396,159
Primary E.\'u/ni/le/'-Robert Halper 130] Foreign Application Priority Dat AHOY/18)., Agent, or Fir/71Ladas, Parry, Von Gehr.
Sept. 12, 1972 hnland 2508/7 Goldsmlth Deschamps [52] US. Cl. 209/3; 209/250; 302/29 [57] ABSTRACT 23 'g B03!) 7/706 A screen device for fine-grain materials for use in 1 easrc '1 pneumatic transport equipment. The device comprises H 13 2 3- screen means inside a transfer pipe and means in the 58 portion of said transfer pipe upstream of said screen means for blowing additional air into said transport [56] References Cited pipe.
UNITED STATES PATENTS 90.097 5/1869 Hanford 209/250 x 6 2 Drawmg F'gures i n n US. Patent Nov. 11, 1975 3,918,585
SCREEN DEVICE FOR PNEUMATIC TRANSPORT EQUIPMENT The subject of the present invention is a screen device for fine-grain materials, such as flour, to be used in pneumatic transport equipment, which screen device consists of a screen arranged inside the transport pipe.
When fine-grain materials, such as flour, are transferred pneumatically, for example, from the truck tank into the warehouse, a need frequently arises to screen the material by separating particles larger than the screen mesh from the material to be transferred. In the case of flour the practice has so far been that the flour has been moved by means of compressed air along a transfer pipe into an intermediate tank, in which the transfer air has been separated from the material, for example, by means of a cyclone. From the intermediate tank the material has been conducted by means of gravitation to the screen and from the screen through a feeding lock into another compressed-air operated transfer pipe, which has carried the material to the destination. The use of an intermediate tank and of a feeding lock has been due to the fact that it has not been possible to connect the screen directly to the transfer pipe under pressure, because therein the screen would be rapidly blocked.
The known equipment described above is complicated and expensive, because it usually comprises two compressors, an intermediate tank with possible cyclone, and a feeding lock. Since the flour passes through the screen only by means of the force of gravitation, the screen area must be made very large in order to reach a satisfactory degree of passing through.
For a long time it has already been known that when mixed with air, the flour is in a way fluidized and then, in the same way as liquids passes through very narrow passages, and the present invention is based on the idea, according to which the blocking of the screen is prevented by making use of this phenomenon. This has been achieved in the screen device in accordance with the invention mainly so that the portion of the transfer pipe upstream of the screen has equipment for blowing additional air into the interior of the said portion.
As was already mentioned above, an ordinary screen is already blocked after an operation of a couple of minutes if it is placed directly in the pressure-air pipe, because the phenomenon of fluidization cannot affect sufficiently strongly. By increasing the quantity of air in the way in accordance with the invention, a strong fluidization of the flour is produced, as a result of which the screen is not blocked and can be positioned directly in the pneumatic transport pipe, because the pressure therein does not disturb the operation of the screen. This involves considerable advantages, for the intermediate tank and the feeding lock can be omitted as unnecessary and the size of the screen can be reduced considerably as compared with known screens of the corresponding capacity, because the overpressure in the transfer tube forces the particles to pass through the screen with a high speed.
The invention will be described below more closely with reference to the attached drawing, wherein FIG. 1 shows a schematic view of a pneumatic transport equipment and FIG. 2 shows a side view of the screen device in partial section.
FIG. 1 shows compressor 1 and the outgoing pneumatic transfer pipe 2, which is connected with a feeding lock 3 and a screen device 4.. Before the feeding lock a by-passing pipe 5 is branched from the transfer pipe to the screen device 4.
According to FIG. 2, the screen device 4 consists of two funnels 6 and 7, placed one opposite the other, between which there is a screen 8. The funnel 6 of the inlet direction has an annular air space 9, from which holes 10 in the funnel wall provide passage into the funnel. The air space 9 is connected with the by-passing pipe 5 through a cock 11.
The transport equipment operates as follows:
The compressor 1 feeds air, for example at an overpressure of 1 kg per square cm, into the transfer pipe 2, into which the material to be transferred is at the same time also being fed from the feeding lock 3. The material passes into the screen device 4, in which air as added into same by means of the by-passing pipe 5, the air space 9 and the holes 10. As a result of this the material is fluidized and sufficiently small particles easily pass through the screen 8 without blocking it.
Particles larger than the mesh of the screen remain in the funnel 6 and can be removed by providing the pipe 2 with two screen devices 2, arranged in parallel (not shown) and which are alternatingly connected to the pipe. When one screen device is connected to the pipe, the other one is at the emptying pipe for removal of the large particles from the screen device. In such a case the transfer of flour need not be interrupted during cleaning of the screen devices.
Alternatively, the larger particles collected in the screen can be removed through a removal pipe provided with a blocking plate. This can take place always when material is not being transferred in the pneumatic transport equipment, thus, for example, after the transfer of the contents of each container of a truck if transfer of flour from a transport truck into a tank is concerned.
It is to be noticed that the attached drawings and the relating description are only intended to illustrate certain preferable embodiments of the invention. Thus, additional air can be introduced in the funnel 6 in many ways, for example through a nozzle introduced in the funnel or through a porous wall that allows air to pass through and that is positioned at the holes 10. The emptying can, moreover, be made automatic by combining the operation of the feeding lock 3 with the operation of the locking plate of the removal pipe as con trolled by a clock or by a tachometer. Neither is it necessary that the funnels 6 and 7 have the shape of a funnel, but they can be, for example, straight pipes whose diameter is constant.
What I claim is:
l. A screen device for fine-grain materials, especially flour, to be used in pneumatic transport equipment comprising:
a source of pneumatic pressure;
a transfer pipe connected to said source of pneumatic pressure; means connected to said transfer pipe for feeding said material into said transfer pipe in order to transport said material along the pipe entrained in a flow of air from said source;
a screen connected to said transfer pipe downstream of said feeding means, and arranged transversely to the transfer pipe; and
stationary means connected to a source of compressed air and defining an array of small apertures, which array extends completely around the interior ofa portion of the transfer pipe located immediately upstream of the screen to form a multiplicity of small, closely spaced air streams in order to mix effectively substantially all of said fine-grain material moving towards said screen with the air of said streams thereby to fluidize the fine-grain material, the pressure of the air of the streams being substantially the same as the transport pressure of said flow of air.
2. A screen device in accordance with claim 1, wherein the stationary means include means defining an annular air space which surrounds said portion of the transfer pipe and is connected to said source of compressed air.
3. A screen device in accordance with claim 1,
wherein said apertures are formed in a wall of said portion and communicate with said annular air space.
4. A screen device in accordance with claim 1, wherein said apertures are defined by a porous wall of said portion.
5. A screen device in accordance with claim 1, wherein the cross-section of the interior of said portion of the transfer pipe increases towards the screen both upstream and downstream of the screen.
6. A screen device in accordance with claim 1, wherein said source of compressed air and said source of pneumatic pressure are one and the same, the transfer pipe being provided with a branch pipe departing from said transfer pipe at a location between said source of pneumatic pressure and said feeding means and being connected to said stationary means.

Claims (6)

1. A screen device for fine-grain materials, especially flour, to be used in pneumatic transport equipment comprising: a source of pneumatic pressure; a transfer pipe connected to said source of pneumatic pressure; means connected to said transfer pipe for feeding said material into said transfer pipe in order to transport said material along the pipe entrained in a flow of air from said source; a screen connected to said transfer pipe downstream of said feeding means, and arranged transversely to the transfer pipe; and stationary means connected to a source of compressed air and defining an array of small apertures, which array extends completely around the interior of a portion of the transfer pipe located immediately upstream of the screen to form a multiplicity of sMall, closely spaced air streams in order to mix effectively substantially all of said fine-grain material moving towards said screen with the air of said streams thereby to fluidize the fine-grain material, the pressure of the air of the streams being substantially the same as the transport pressure of said flow of air.
2. A screen device in accordance with claim 1, wherein the stationary means include means defining an annular air space which surrounds said portion of the transfer pipe and is connected to said source of compressed air.
3. A screen device in accordance with claim 1, wherein said apertures are formed in a wall of said portion and communicate with said annular air space.
4. A screen device in accordance with claim 1, wherein said apertures are defined by a porous wall of said portion.
5. A screen device in accordance with claim 1, wherein the cross-section of the interior of said portion of the transfer pipe increases towards the screen both upstream and downstream of the screen.
6. A screen device in accordance with claim 1, wherein said source of compressed air and said source of pneumatic pressure are one and the same, the transfer pipe being provided with a branch pipe departing from said transfer pipe at a location between said source of pneumatic pressure and said feeding means and being connected to said stationary means.
US396159A 1972-09-12 1973-09-11 Screen device for pneumatic transport equipment Expired - Lifetime US3918585A (en)

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FI722508A FI48684C (en) 1972-09-12 1972-09-12 Sighting device for pneumatic transport systems

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AR (1) AR200281A1 (en)
AU (1) AU474483B2 (en)
BE (1) BE804773A (en)
BR (1) BR7307078D0 (en)
CA (1) CA979850A (en)
DE (1) DE2345678A1 (en)
DK (1) DK131550B (en)
FI (1) FI48684C (en)
FR (1) FR2198794B1 (en)
GB (1) GB1414882A (en)
IT (1) IT993166B (en)
NL (1) NL7312577A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213855A (en) * 1974-01-23 1980-07-22 Bennigsen Mackiewicz A Von Sifting equipment for fine-grained bulk material, particularly flour
US4249655A (en) * 1979-06-29 1981-02-10 The United States Of America As Represented By The Secretary Of Agriculture Cyclone dust analyzer for determining microdust content in fibers
US4769127A (en) * 1985-09-30 1988-09-06 Amoco Corporation Computerized monorail catalyst handling process and system for resid hydrotreating units
US5908115A (en) * 1994-05-27 1999-06-01 Montell North America, Inc. Method and apparatus for the classification of solid particles
US20060163118A1 (en) * 2005-01-26 2006-07-27 Eastman Kodak Company Particulate separation processes and apparatus
CN101857145A (en) * 2010-06-11 2010-10-13 恩华特远东有限责任公司 The rotary screen that is used for pneumatic rubbish conveying system
CN109046694A (en) * 2018-09-17 2018-12-21 长沙开元仪器有限公司 Grinding type pulverizer
US20200255233A1 (en) * 2017-09-29 2020-08-13 Mitsubishi Chemical Engineering Corporation Pipe for transport of granular matter and granular matter transport method
CN114101065A (en) * 2022-01-26 2022-03-01 山东街景智能制造科技股份有限公司 Airflow screening device for powdery water purification material

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
BR7602976A (en) * 1975-05-16 1977-05-31 Mogensen Frederik Kb & Co PROCEDURE FOR SIMULTANEOUS CONCENTRATION AND SEPARATION, ACCORDING TO THE SIZE OF THE PARTICLES, OF A SET OF HETEROGENEIC PARTICLES IN DIFFERENT GROUPS
DK159867C (en) * 1980-01-04 1991-05-21 Icab Ind Coating Ab ELECTROSTATIC POWDER SPRAY Aggregate
FR2517570A1 (en) * 1981-12-04 1983-06-10 Ashland Chemical France Sa Process for sepn. of particles by mass - uses fluidised bed followed by filter to recover low mass particles
GB2123783B (en) * 1982-07-21 1985-10-23 Linder Hermann J Feeding pressure medium into a conveyors pipeline
JP2527105Y2 (en) * 1989-04-21 1997-02-26 繁雄 林田 The disappearing puzzle
DE4223924A1 (en) * 1992-07-21 1994-01-27 Erwin Schulze Device for accelerating the transport of a medium, e.g. B. air in a pipeline conveyed bulk goods, for. B. fly ash
WO2015150484A1 (en) 2014-04-01 2015-10-08 Bühler AG Screen device for unloading silo vehicles
CN111318454A (en) * 2018-12-13 2020-06-23 中国石油化工股份有限公司 Method for filtering particle impurities in dilute-phase pneumatic conveying crude terephthalic acid product
CN112604959A (en) * 2020-12-07 2021-04-06 美巢集团股份公司 Powder screening device

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US550911A (en) * 1895-12-03 John corey fell
US849225A (en) * 1906-04-06 1907-04-02 Louis Gans Apparatus for separating chaff from coffee.
US1211736A (en) * 1915-11-01 1917-01-09 David E Marshall Apparatus for disintegrating shavings.
US1272682A (en) * 1914-03-30 1918-07-16 Adolph W H Lenders Method of producing dustless starch.
US1530193A (en) * 1923-03-15 1925-03-17 Henry S Montgomery Screening machine
US1573373A (en) * 1926-02-16 Carbon industries
US2874840A (en) * 1954-09-24 1959-02-24 Columbian General Blacks Ltd Methods of separating or classifying materials
US2910731A (en) * 1956-10-30 1959-11-03 Vernon P Moore Textile fiber sorter
US3254766A (en) * 1963-03-28 1966-06-07 Procter & Gamble Apparatus and method for sifting particulate bulk material
US3685651A (en) * 1969-12-18 1972-08-22 Clarence R Gruber Particle cleaning apparatus

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DE1102650B (en) * 1955-10-31 1961-03-16 Westin & Backlund Ab Pneumatic conveyor for conveying bulk goods by means of compressed air from a container into a pipeline
FR1177528A (en) * 1956-06-25 1959-04-27 Method and device for the transport of floury or pulverulent products in tubular conduits or pneumatic transport conduits
CH355017A (en) * 1957-12-13 1961-06-15 Mettler E Fabrik Fuer Analysenwaagen Sieving device, especially for sieving dry, dusty substances
US3421619A (en) * 1967-03-08 1969-01-14 Gen Electric Method and means for separating individual fibers from a fibrous mass
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Publication number Priority date Publication date Assignee Title
US90097A (en) * 1869-05-18 Improved apparatus for purifying-, screening
US550911A (en) * 1895-12-03 John corey fell
US1573373A (en) * 1926-02-16 Carbon industries
US849225A (en) * 1906-04-06 1907-04-02 Louis Gans Apparatus for separating chaff from coffee.
US1272682A (en) * 1914-03-30 1918-07-16 Adolph W H Lenders Method of producing dustless starch.
US1211736A (en) * 1915-11-01 1917-01-09 David E Marshall Apparatus for disintegrating shavings.
US1530193A (en) * 1923-03-15 1925-03-17 Henry S Montgomery Screening machine
US2874840A (en) * 1954-09-24 1959-02-24 Columbian General Blacks Ltd Methods of separating or classifying materials
US2910731A (en) * 1956-10-30 1959-11-03 Vernon P Moore Textile fiber sorter
US3254766A (en) * 1963-03-28 1966-06-07 Procter & Gamble Apparatus and method for sifting particulate bulk material
US3685651A (en) * 1969-12-18 1972-08-22 Clarence R Gruber Particle cleaning apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213855A (en) * 1974-01-23 1980-07-22 Bennigsen Mackiewicz A Von Sifting equipment for fine-grained bulk material, particularly flour
US4249655A (en) * 1979-06-29 1981-02-10 The United States Of America As Represented By The Secretary Of Agriculture Cyclone dust analyzer for determining microdust content in fibers
US4769127A (en) * 1985-09-30 1988-09-06 Amoco Corporation Computerized monorail catalyst handling process and system for resid hydrotreating units
US5908115A (en) * 1994-05-27 1999-06-01 Montell North America, Inc. Method and apparatus for the classification of solid particles
CN1054782C (en) * 1994-05-27 2000-07-26 蒙特尔北美公司 Method and apparatus for the classification of solid particles
US20080237094A1 (en) * 2005-01-26 2008-10-02 Kelsey Jeffery P Particulate separation processes and apparatus
US20060163118A1 (en) * 2005-01-26 2006-07-27 Eastman Kodak Company Particulate separation processes and apparatus
CN101857145A (en) * 2010-06-11 2010-10-13 恩华特远东有限责任公司 The rotary screen that is used for pneumatic rubbish conveying system
CN101857145B (en) * 2010-06-11 2012-12-12 恩华特远东有限责任公司 Rotary screen for pneumatic rubbish conveying system
US20200255233A1 (en) * 2017-09-29 2020-08-13 Mitsubishi Chemical Engineering Corporation Pipe for transport of granular matter and granular matter transport method
US10947064B2 (en) * 2017-09-29 2021-03-16 Mitsubishi Chemical Engineering Corporation Pipe for transporting powder and method for transporting powder
CN109046694A (en) * 2018-09-17 2018-12-21 长沙开元仪器有限公司 Grinding type pulverizer
CN114101065A (en) * 2022-01-26 2022-03-01 山东街景智能制造科技股份有限公司 Airflow screening device for powdery water purification material
CN114101065B (en) * 2022-01-26 2022-05-13 山东街景智能制造科技股份有限公司 Likepowder water purification material air current screening plant

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DK131550B (en) 1975-08-04
AU474483B2 (en) 1976-07-22
GB1414882A (en) 1975-11-19
BE804773A (en) 1974-01-02
FR2198794B1 (en) 1977-08-12
FR2198794A1 (en) 1974-04-05
FI48684B (en) 1974-09-02
CA979850A (en) 1975-12-16
JPS49100649A (en) 1974-09-24
FI48684C (en) 1974-12-10
DK131550C (en) 1975-12-29
IT993166B (en) 1975-09-30
DE2345678A1 (en) 1974-03-28
NL7312577A (en) 1974-03-14
BR7307078D0 (en) 1974-06-27
AR200281A1 (en) 1974-10-31
AU6023673A (en) 1975-03-13

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