US2543344A - Arrangement for drawing sand and sand mixtures from a container - Google Patents

Arrangement for drawing sand and sand mixtures from a container Download PDF

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Publication number
US2543344A
US2543344A US619301A US61930145A US2543344A US 2543344 A US2543344 A US 2543344A US 619301 A US619301 A US 619301A US 61930145 A US61930145 A US 61930145A US 2543344 A US2543344 A US 2543344A
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US
United States
Prior art keywords
sand
conveyor
container
tube
screw conveyor
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.)
Expired - Lifetime
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US619301A
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English (en)
Inventor
Tutsch Henry
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OMO AG
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Individual
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Publication date
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Publication of US2543344A publication Critical patent/US2543344A/en
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Classifications

    • 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
    • B24C7/0092—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed by mechanical means, e.g. by screw conveyors
    • 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
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/06—Gas pressure systems operating without fluidisation of the materials
    • B65G53/08—Gas pressure systems operating without fluidisation of the materials with mechanical injection of the materials, e.g. by screw
    • 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
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • B65G65/34—Emptying devices
    • B65G65/40—Devices for emptying otherwise than from the top
    • B65G65/46—Devices for emptying otherwise than from the top using screw conveyors
    • B65G65/463—Devices for emptying otherwise than from the top using screw conveyors arranged vertically or substantially vertically within the container
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00—Implements for finishing work on buildings
    • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
    • E04F21/06—Implements for applying plaster, insulating material, or the like
    • E04F21/08—Mechanical implements
    • E04F21/12—Mechanical implements acting by gas pressure, e.g. steam pressure

Definitions

  • the present inventionY relates toan arrangement for drawing sand and sand mixtures indry condition from a container for the'y purpose of feeding them to a spray pistol.
  • sand-blasting apparatus arenaceous quartz of regular granulation is drawn from a container and blown by means of compressedair to thespray pistol.
  • the devicesin use with sand-blasting apparatus cannot be used for drawingv oil sand, and sand mixtures, as sand of irregular granulation or sand mixtures form lumps.
  • sand-blasting an irregular passage of materia-lis ofr no importance. With sand mixtures, however, which are moistened during spraying with some liquid e. g.
  • the aim of the present invention is to create an arrangement by means of which sand and sand mixtures of the most varied granulation can be drawn from a container without interruption and in aA constant flow'.
  • the sand orl sand mixture is drawn bymeans of a screw conveyor from an open container without interruption and in a constant ow and is conveyed to within reach of an air-now which carries it along to a spray pistol.
  • the arrangement which carries out the process consists in a non-revolving conveyor tube dipping into a rotating container which can be iilled from above.
  • a screw conveyor turns and raises the material in the conveyor tube.
  • the latter which enclosesV a hollow space above the screw conveyor, is closed in its axial direction and possesses at least one entrance hole for compressed air leading, into this hollow space at right angles to the tube axis', and also an escape hole opposite said entrance hole.
  • Fig. 1 a longitudinal section of the arrangement
  • Fig. 2v a top view of the same
  • Fig. 3 a section ofthe conveyor-tube and screw conveyor' along line I-I in Fig. 1,
  • Fig. 4 a section along line II-II inV Fig. l,
  • Fig. 5 likewise a section of Vthe screw conveyor along line III-III in Fig. 9,
  • Fig. 8 a top view of Fig. '7
  • Fig. 9 a section along line IV--IV in Fig. '7.
  • Material-container I is fixed to hollow shaft 2 which is mounted in bearing 3.
  • driving-wheel d e. g. a spur-gear, which serves to drive container I.
  • Inside hollow shaft Z is placed hollow spindle 5 driven by toothed Wheel 6'.
  • Screw conveyor I is interchangeably inserted in hollow spindle 5 and tightly fastened with a key.
  • the upper edge of containerV I is covered by ring il with angular cross-section.
  • This ring 8 is attached to struts 9 of a stand which is not shown.
  • On ring is fastened cross-piece I@ which is welded to conveyor tube I I.
  • Conveyor tube I l dips right down to the floor of container I, though it does not actually touch it.
  • the upper end of the conveyor tube is closed by means of plate I2, lying at right angles to its axis. Between this plate and the upper end of screw conveyor 'I is hollow space I3 into which lead injection openings III, arranged in a semi-circle, for the purpose of introducing the compressed air, which is supplied through pipe I5. Opposite injection openings I l is exit It, through which the compressed air blows the material Via pipe Il to the spray pistol. rIhrough entrance-hole 2li provided in the side of conveyor tube I I the material which turns with container I penetrates into conveyor tube I I and is raised by screw conveyor l. In order to direct the material which turns with container I round conveyor tube I I up into the latter, conveyor tube i l is equipped with diffusion vane 2
  • the screw conveyor can turn at the same speed as container I in which case, it can be'rigidly connected with container I. It is, however, necessary, according to the kind of material to be conveyed, that the screw conveyor should turn at a higher speed than, or even in the opposite direction to, container l. For this reason it is' of advantage to give both screw conveyor 'I'and container I their own separate drive, which is best fitted With a device for regulating the number of revolutions.
  • Figs. 5, 6, '7, 8 and 9 show in particular the material-regulating arrangement by means of which the material is transferred from the container to theconveyor tube.
  • Fig. 5 shows conveyor tube II, which is coated on the inside with rubber lining 22, as it has been found that rubber resists .sand abrasion better than metal. In addition, particles of sand which have become jammed may be pressed into the rubber and in this way escape the screw conveyor.
  • the difference between the outer diameter of screw conveyor 'I and' the inner' diameter of the rubber lining of the conveyor ⁇ tube is twice as large as the largest particle of sand to be conveyed. The purpose of this is:
  • the air-pressure required for blowing out and spraying the material is about 6 atmospheres. At this pressure there is a danger that the compressed air may force its way through the conveyor tube between the thread of the screwl conveyor and escape through the sand in the container. In order to prevent this, it is necessary that an air-tight plug be formed in the conveyor tube by the material itself. This is achieved by the material being pressed together by the screw, so as to form a plug which is impervious to the compressed air.
  • screw conveyor and conveyor tube to be designed in such a manner that the feed aperture for the material in the conveyor tube is at least of the same width as one thread of the screw, and that above the feed aperture at least one such thread is left to press the sand upwards, in order to form a suciently airtight plug.
  • diffusion vane 23 is best arranged in front of the aperture; diffusion vane 23 can rotate round axle 2d and lie adjusted at an angle to the tangent of the conveyor tube.
  • 4axle 24 of diffusion vane 23 is equipped with lever 25 which can be clamped in various positions by means of a winged screw.
  • a greater or lesser quantity of material is conveyed into the screw conveyor according to the angular adjustment ,of this diffusion vane.
  • the material to be conveyed usually consists of a mixture of sand and cement or sand and lime, it tends to form lumps.
  • the supply of material to the conveyor tube must correspond, therefore, as closely as possible to the conveying capacity of the screw.
  • the container is filled with sand or a sand mixture, which flows, for example, from a mixing drum, and is set in motion over wheel 4 at the speed of 30 revolutions per minute by means of a drive, not shown here. At this speed the centrifugal force is not strong enough for the mixture to separate. Passing round the conveyor tube and past the appurtenant diffusion vane, the material is conveyed within reach of the screw conveyor, which turns either at the same speed as container I or faster. This screw conveyor presses the material in the conveyor tube upwards and forms in the latter a stop plug which prevents the compressed air from escaping through the conveyor tube. Compressed air enters the hollow space at the upper end of the regular quantity of material.
  • the quantity of material conveyed depends on the number of revolutions of the screw conveyor and can be adjusted exactly to the required proportions by regulating this number of revolutions. It remains constant because at a certain number of revolutions the screw conveyor conveys a This makes it possible to feed to the ow of material which is driven oif a determined amount of liquid, so that the consistency of the paste sprayed remains unvaried.
  • Apparatus for drawing sand and sand mixtures from a container comprising a container having a charging opening for filling the same from above, a conveyor tube disposed within the container and extending to approximately the bottom of the container, the tube having an inlet for the sand adjacent the bottom thereof, means for rotating the container relatively to said tube, a screw conveyor rotatable within the tube for raising the sand or sand mixture therein, means for driving the conveyor, said tube enclosing a hollow space above the screw conveyor and being closed in the axial direction, said tube having at least one injection opening for compressed air leading into the said hollow space and arranged transversely to the conveyor-tube axis, and provided with a discharge opening opposite the first opening forthe mixture of sand and conveying air.
  • the inlet in the conveyor tube is constituted of an opening in the side of the tube, and a diffusion vane supported adjacent to such opening for directing material thereinto, said vane being adjustable to extend at a sharp angle to the tangent of the conveyor tube.
  • Apparatus according to claim 1 in which the difference between the outer diameter of the screw conveyor and the inner diameter of the conveyor tube is equal to at least twice the size of the largest particle of sand to be conveyed.
  • the inlet in the conveyor tube is constituted of an opening in the side of the tube and including a vane supported adjacent to said inlet to de- Iiect material thereinto, and a defiector plate extending outwardly from the tube and in advance of the vane to discourage the formation of lumps at the inlet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Screw Conveyors (AREA)
US619301A 1944-10-03 1945-09-29 Arrangement for drawing sand and sand mixtures from a container Expired - Lifetime US2543344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2543344X 1944-10-03

Publications (1)

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US2543344A true US2543344A (en) 1951-02-27

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US619301A Expired - Lifetime US2543344A (en) 1944-10-03 1945-09-29 Arrangement for drawing sand and sand mixtures from a container

Country Status (4)

Country Link
US (1) US2543344A (enrdf_load_stackoverflow)
BE (1) BE460384A (enrdf_load_stackoverflow)
CH (1) CH243418A (enrdf_load_stackoverflow)
NL (1) NL64048C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889083A (en) * 1956-07-11 1959-06-02 Walter A Schwinhorst Apparatus for dispensing flocking material
DE1123591B (de) * 1957-02-04 1962-02-08 Centriblast Corp Ortsbewegliche Strahlanlage
US3146918A (en) * 1962-06-11 1964-09-01 Edward C Williams Particulate material feeding apparatus
US3271083A (en) * 1965-09-13 1966-09-06 Sperry Rand Corp Pneumatic conveyor
EP0194121A1 (en) * 1985-03-02 1986-09-10 Kue Engineering Limited Blast cleaning
US20220281050A1 (en) * 2018-04-19 2022-09-08 Raytheon Technologies Corporation Flow directors and shields for abrasive flow machining of internal passages
WO2023049251A1 (en) * 2021-09-22 2023-03-30 Usc, Llc Feeder unit for direct, low leakage attachment to dry material bucket

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218869A1 (de) * 1985-09-20 1987-04-22 SCHLICK-Roto-Jet Maschinenbau GmbH Vorrichtung zum gleichmässigen Dosieren von körnigem Strahlmittel bei pneumatisch arbeitenden Strahlmittelanlagen
US4970830A (en) * 1985-09-20 1990-11-20 Schlick-Roto-Jet Maschinenbau Gmbh Apparatus for the uniform dosage of granular blasting agents in pneumatical blasting machines

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US192285A (en) * 1877-06-19 Improvement in exhaust and blowing fans
US837113A (en) * 1906-07-31 1906-11-27 Eli Phillips Apparatus for moving coal.
US859863A (en) * 1906-06-23 1907-07-09 Smith Dean Sand-blast device.
US1013379A (en) * 1912-01-02 William R Dunn Apparatus for heating furnaces or kilns.
US1376043A (en) * 1920-02-24 1921-04-26 Sherwood Charles Frederic Shaft-bearing
US1456165A (en) * 1919-10-21 1923-05-22 Albert A Eddie Ore separator
US1866682A (en) * 1928-11-08 1932-07-12 Lawrence C Turnock Apparatus for and method of handling liquid metal
US1966325A (en) * 1933-06-28 1934-07-10 Verne E Welch Pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US192285A (en) * 1877-06-19 Improvement in exhaust and blowing fans
US1013379A (en) * 1912-01-02 William R Dunn Apparatus for heating furnaces or kilns.
US859863A (en) * 1906-06-23 1907-07-09 Smith Dean Sand-blast device.
US837113A (en) * 1906-07-31 1906-11-27 Eli Phillips Apparatus for moving coal.
US1456165A (en) * 1919-10-21 1923-05-22 Albert A Eddie Ore separator
US1376043A (en) * 1920-02-24 1921-04-26 Sherwood Charles Frederic Shaft-bearing
US1866682A (en) * 1928-11-08 1932-07-12 Lawrence C Turnock Apparatus for and method of handling liquid metal
US1966325A (en) * 1933-06-28 1934-07-10 Verne E Welch Pump

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889083A (en) * 1956-07-11 1959-06-02 Walter A Schwinhorst Apparatus for dispensing flocking material
DE1123591B (de) * 1957-02-04 1962-02-08 Centriblast Corp Ortsbewegliche Strahlanlage
US3146918A (en) * 1962-06-11 1964-09-01 Edward C Williams Particulate material feeding apparatus
US3271083A (en) * 1965-09-13 1966-09-06 Sperry Rand Corp Pneumatic conveyor
EP0194121A1 (en) * 1985-03-02 1986-09-10 Kue Engineering Limited Blast cleaning
WO1986005136A1 (en) * 1985-03-02 1986-09-12 Kue Engineering Limited Blast cleaning
US4965968A (en) * 1985-03-02 1990-10-30 Kue Engineering Limited Blast cleaning
US20220281050A1 (en) * 2018-04-19 2022-09-08 Raytheon Technologies Corporation Flow directors and shields for abrasive flow machining of internal passages
WO2023049251A1 (en) * 2021-09-22 2023-03-30 Usc, Llc Feeder unit for direct, low leakage attachment to dry material bucket

Also Published As

Publication number Publication date
CH243418A (de) 1946-07-15
BE460384A (enrdf_load_stackoverflow)
NL64048C (enrdf_load_stackoverflow)

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