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EP0005604A1 - Maschine zum Reinigen von Oberflächen - Google Patents

Maschine zum Reinigen von Oberflächen Download PDF

Info

Publication number
EP0005604A1
EP0005604A1 EP79300768A EP79300768A EP0005604A1 EP 0005604 A1 EP0005604 A1 EP 0005604A1 EP 79300768 A EP79300768 A EP 79300768A EP 79300768 A EP79300768 A EP 79300768A EP 0005604 A1 EP0005604 A1 EP 0005604A1
Authority
EP
European Patent Office
Prior art keywords
abrasive grit
opening
receiving container
air
grit
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.)
Ceased
Application number
EP79300768A
Other languages
English (en)
French (fr)
Inventor
Charles William Lake
Herb Weber
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.)
Worldwide Blast Cleaning Ltd
Original Assignee
Worldwide Blast Cleaning Ltd
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
Application filed by Worldwide Blast Cleaning Ltd filed Critical Worldwide Blast Cleaning Ltd
Publication of EP0005604A1 publication Critical patent/EP0005604A1/de
Priority claimed from AU84247/82A external-priority patent/AU8424782A/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/06—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable
    • B24C3/065—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable with suction means for the abrasive and the waste material
    • B24C3/067—Self-contained units for floorings

Definitions

  • This invention relates to a surface cleaning machine of the kind in which abrasive grit is projected at high velocity against a surface to be cleaned.
  • the surface is subjected to an abrasive blast which is produced for example by a vaned blast wheel rotating at high speed, to fling or project the abrasive grit with, great force on to the surface so as to blast-clean from it all dirt.
  • the abrasive grit used is usually fine steel shot and such material will be referred to herein for brevity as "grit”.
  • Dirt to be cleaned from the surface may be of various kinds, for example dust, paint, oil, rust, or other contaminants or coverings, and mixtures of them : these will be referred to herein for brevity as "dirt".
  • the invention is therefore based on the problem of providing a surface cleaning machine of the kind referred to above, which can be readily used for cleaning different kinds of surfaces with different kinds of surface contaminants.
  • a surface cleaning machine of the kind in which abrasive grit is projected at high velocity against a surface to be cleaned comprising:
  • the additional receiving container preferably in the form of a hopper, collects reclaimed grit mixed with dirt.
  • air pressure in that container may be reduced by removing air, preferably from the reclaim channel, upstream of the grit in the additional receiving container.
  • the grit mixed with dirt can then flow through the outlet from the additional receiving container and this outlet is of adjustably variable size, sc that the curtain of grit which flows from it into the main receiving container or hopper can be maintained according to the weight or size of grit being used. It is to be noted that different grits will be used for different surfaces and contaminants.
  • the air inlet into the main receiving container provides a flow of air through the curtain of grit entering the main container, to remove the dirt, which is generally of lighter weight than the grit, from the grit. In this way the dirt is blown away from the grit.
  • the air inlet into the main container be of adjustably variable size, so that the air flow through the main container can be varied to suit the various kinds of operating condition. Thus for example for removal of dirt which is light in weight, less air is required to flow through the main receiving container.
  • the opening or openings previded for removal of air from the air flow is or are also p ' crably of variably adjustable size so that the amount of air removed from the air flow can be controlled according to the particular operating requirements.
  • the projecting device for projecting the abrasive grit may be mounted in the machine so that the angle between the incident path of the projected abrasive grit and the surface to be cleaned can be adjustably varied.
  • the projecting device is a vaned blast wheel rotatable at high speed, it may be so mounted in the machine that its axis of rotation may be moved, to change the angle of the incident path.
  • a driving motor, a shaft carrying the blast wheel, and the blast wheel, together with housing parts forming a channel along which the grit is projected constitute a unit or head which is tiltable as a whole about a hingeing axis.
  • the grit by virtue of its speed of movement and by virtue of the air pressure, can become compacted in the receiving container or hopper to which it is returned before being fed to the blast wheel for re-use; and the grit, by virtue of the friction imparted to it by its high velocity motion in contact with the walls of the reclaim channel, becomes heated, so that some kinds of removed dirt, for example paint, clings to the grit and cannot be easily separated from the grit and evacuated to a dirt collector, which is usually a container to which strong suction is applied and which is usually also the source of the air flow through the machine.
  • a dirt collector which is usually a container to which strong suction is applied and which is usually also the source of the air flow through the machine.
  • the air may be largely removed from the air flow so as to reduce the effect of the air flow on the dirt before it reaches the hopper.
  • the opening or openings is or are in the form of louvres through which the air and some of the dirt is removed to the dirt collector.
  • the louvres are adjustably movable to provide for variation of their area, to suit various operating conditions, whereby a greater or lesser amount of air can be removed from the reclaim channel.
  • the reclaim channel may be in the known form of a closed channel of rectangular cross-section, except that the cross-section is the same or virtually the same throughout the length of the channel from the cleaned surface zone to the additional receiving container when the projecting device is in the position for maximum blast-cleaning effect.
  • a surface cleaning machine of the kind in which a surface 1 to be cleaned is subjected to a high velocity blast 2 of abrasive grit which blast is produced by a vaned blast wheel 3 mounted on a shaft 3A and driven by a hydraulic motor 3B at high speed, for example 3400 to 3850 r.p.m.
  • the machine has an enclosure, formed by the various plates seen in Figure 1, as will be described, and the enclosure has an opening 4 at the surface 1.
  • the opening 4 is rectangular in plan and has sealing means disposed around it; this sealing means comprises double sealing strip members 5A, 5B, 5C and 5D respectively at each side of the opening and in contact with the surface 1.
  • the area of the surface 1 within the opening 4 at any time is the zone which is to be cleaned and to which abrasive material in the form of grit 6 is flung by the blast wheel 3 along an incident path.
  • the incident path includes an angle of approximately 80° with the surface 1. (Grit is indicated by the reference numeral 6 in several parts of the machine).
  • the machine is mounted for movement on a forward castor wheel 7A and rear driven wheels 7B, 7C (Fig. 2) driven by a motor (not shown).
  • a reclaim channel 8 which is formed by a curved front reclaim channel plate 8A; parallel spaced side plates of which one is seen at 8B; and a rear reclaim channel plate 8C which is pivotally swingable about a hinge axis 9 from the full line position to the dot-dash line position shown; it will be seen that in the latter position the plate 8C is still below the upper edges of the spaced side plates 8B, one of which upper edges is indicated at 8B'.
  • the enclosure is formed by the reclaim channel and also by the several plates enclosing the blast wheel : a front plate 10A, rear plate 10B, side plates 10C and top plate 10D.
  • the machine also includes a main receiving container in the form of a lower hopper 11 which includes inclined forward and rear plates 11A, 11B respectively; an additional receiving container or upper hopper 12 which also includes inclined forward and rear plates 12A, 12B respectively; and a return channel 13 for air and dirt and having upper and lower walls 13A, 13B respectively.
  • a dirt collector 14 At the front of the machine is a dirt collector 14, into which dirt removed from the cleaned surface zone by the grit is sucked and stored, somewhat in the manner of a vacuum cleaner.
  • the dirt collector 14 has an outer box-like casing 14A, the rear wall of which is open at 14B for movement of air and dirt into it.
  • the collector 14 also includes dust bags 15 with support cages 15A.
  • Air flow for the dirt collector and for the whole machine is provided by a fan 16 driven by a hydraulic motor 16A and having an exhaust 16B.
  • a quick release, adjustably programmable electronic pulsar valve 16C and associated air tank 16D are mounted on the casing 14A as shown.
  • the grit projecting device comprises the vaned blast wheel 3, with its shaft 3A and motor 3B, and the various plates enclosing the blast wheel.
  • the blast wheel is 35 cms. in diameter and has seven curved vanes.
  • An operator's handle is seen at 18.
  • the grit projecting device is movable from the full line position to the dot-dash line position and can be fixed in either position, or in an intermediate position, by means not shown. In the full line or 80° position there is maximum cleaning effect and maximum grit rebound effect.
  • Grit is fed from the main hopper 11 to the blast wheel through a grit flow control valve 19 and extensible flexible corrugated ducting 20.
  • An extensible gas-contrcilcd strut 21 supports the grit projecting device and is connected at its forward end to brackets 21A fixed to the side plates 8B and at its rear end to brackets 21B on the plate 10A.
  • the rear reclaim channel plate 8C is hingedly connected at 22 to the plate 10A, so that when the grit projecting device is moved, the plate 8C moves with it about the hinge 9, and between the side plates 8B.
  • a blast liner within the housing formed by the several plates 10A-10D is a blast liner; this comprises an inner housing of heavy cast metal to contain the grit; it surrounds the blast wheel, as indicated at 23 (Fig. 2) and also defines the path of the projected grit, as indicated at 24.
  • a heavy liner is needed to withstand the wear caused by the grit; normal steel plating as used for other parts of the machine would very quickly be worn away.
  • An air intake 25 to the cleaning zone includes a brush-like screen 25A which permits entry of air, but retains grit and dirt.
  • the intake 25 is adjustable, for control of the amount of air drawn in.
  • the air intake is at the top of a channel 25B opening downwardly near the surface 1 at the rear of the zone 4. The indrawn air is thus drawn downwardly in a controlled amount to the zone 4; this keeps in motion any grit or dirt which tends to become idle and to accumulate near the rear sealing members 5B as the machine is moved forwardly, that is, to the right as seen in Figure 1.
  • the reclaim channel S is curved and parallel-sided in the full-line position, so that the air flow upwardly in the reclaim channel 8 is not subject in that position to a venturi effect and its speed is not increased.
  • the construction is such that its cross-sectional area at the level of the hinge 9 remains constant, even when the rear reclaim channel wall 8C is swung upwardly to the dash-dot line position, so that in the latter position the speed increase of the air flow is not significant.
  • the air outlet, and one dirt outlet, from the reclaim channel 8 is by way of openings 26 having rockable louvres or flaps 26D, Figure 3.
  • flaps are pivotally mounted and can be opened or closed to the required degree by an arrangement of rollers 26A mounted on a rod 26D movable by a handle 26C as indicated by the double-headed arrow in Figure 3. It will be noted that the air is largely removed from the air flow upstream of the surface 12C of the grit collected in the upper or additional hopper 12, so that downstream of the louvres 26 the air speed and pressure is low whereby compaction of the grit in the upper hopper 12 is not increased.
  • the wall 13B forms the upper surface of the upper hopper 12 and is a continuation of the wall 8A downstream of the louvres 26.
  • the wall 138 is curved and provides for smooth flow of the grit to the upper hopper 12 and in practice most of the impact of the reclaimed grit is absorbed by the surface 12C of the mass of reclaimed grit already in the upper hopper 12.
  • the reclaimed grit falls through an outlet 27 which is of adjustably variable size, having a weight-controlled flap valve 27A and down into the main hopper 11.
  • the flap valve 27A operates in dependence on the weight of the grit in the upper hopper. The less the grit, the less the fall and vice versa.
  • the grit falls in the form of a curtain 6A.
  • In the wall 11A of the main hopper 11 is an air inlet of controllable size, having an adjustable flap valve 2SA, through which inlet air can be drawn so as to pass through the falling curtain 6A of grit and remove more dirt from it; the removed dirt travels along the path indicated by the arrows through the return channel 13 and thence to the dirt collector 14 through the opening 14B. Passage of the air through the curtain 6A assists in further cooling the latter, as well as cleaning it.
  • the cleaned and cooled grit collects as a mass in the lower or main hopper 11 and is returned by way of the controllable valve 19 and ducting 20 to the blast wheel 3.
  • grit flow from the blast wheel is approximately 365 kgs. per minute; air flow in the machine is 34 to 45 cu. metres per minute.
  • the cross-sectional area of the reclaim channel at the level of the hinge axis 9 is approximately 510 sq. cms.
  • the size of the reclaim channel in the present embodiment is 46 cms. x 11.5 cms., the latter dimension being in the plane of the drawing.
  • the total maximum area of the louvres 26 is 175 sq.cms.
  • the air intake is 116 sq.cms.
  • the louvres 26D and the flap valve 28A can be operated in unison. This is shown diagrammatically as follows. Fixed to the handle 26C is a pivot lever 26E which is connected by a link 29 to a pivot lever 28B fixed to the pivot shaft 28C of the flap valve 25A. Thus when the handle 26C is operated to adjust the louvres 26D, the flap valve 28A is also adjusted. If the louvres 26D are adjusted to reduce the air flow through them, the flap valve 28A is adjusted to increase the amount of air entering the main hopper 11 through the inlet 28.
  • the flap valve 27A is also connected to the pivot lever 26E by a link 30 in generally similar manner, for control of the amount of grit falling through the opening 27.
  • the flap valve 28A can be connected to the pivot lever 26E, but not the flap valve 27A.
  • the openings 26 and 28 can be controlled in unison, but the opening 27 can be controlled separately, for example by a lever (not shown) connected to a pivot shaft (not shown) of the flap valve 27A, a weight (not shown) being movably mounted on the lever.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Artificial Filaments (AREA)
EP79300768A 1978-05-19 1979-05-04 Maschine zum Reinigen von Oberflächen Ceased EP0005604A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB2072078 1978-05-19
GB20720/78A GB1603308A (en) 1978-05-19 1978-05-19 Abrasive throwing machine
AU84247/82A AU8424782A (en) 1978-05-19 1982-05-28 Surface cleaning machine via abrasive blasting

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP80106366A Division EP0032161A1 (de) 1978-05-19 1979-05-04 Maschine zum Reinigen von Oberflächen
EP80106366A Division-Into EP0032161A1 (de) 1978-05-19 1979-05-04 Maschine zum Reinigen von Oberflächen

Publications (1)

Publication Number Publication Date
EP0005604A1 true EP0005604A1 (de) 1979-11-28

Family

ID=32657321

Family Applications (2)

Application Number Title Priority Date Filing Date
EP80106366A Withdrawn EP0032161A1 (de) 1978-05-19 1979-05-04 Maschine zum Reinigen von Oberflächen
EP79300768A Ceased EP0005604A1 (de) 1978-05-19 1979-05-04 Maschine zum Reinigen von Oberflächen

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP80106366A Withdrawn EP0032161A1 (de) 1978-05-19 1979-05-04 Maschine zum Reinigen von Oberflächen

Country Status (10)

Country Link
EP (2) EP0032161A1 (de)
JP (2) JPS555282A (de)
AR (1) AR218723A1 (de)
BR (1) BR7903080A (de)
CA (1) CA1115528A (de)
DK (1) DK204979A (de)
GB (1) GB1603308A (de)
HK (2) HK46082A (de)
NO (2) NO791612L (de)
ZA (1) ZA792058B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0349490A1 (de) * 1988-07-01 1990-01-03 Aspa Zürich Ag Verfahren und Vorrichtung zur Aufbereitung von Granulaten

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4394256A (en) 1981-02-09 1983-07-19 Goff James R Apparatus for separating abrasive blasting media from debris
US4364823A (en) 1981-02-09 1982-12-21 Goff James R Apparatus for separating abrasive blasting media from debris
JPS583988U (ja) * 1981-06-25 1983-01-11 結城　保則 床面自動研掃装置
US4753052A (en) * 1985-05-01 1988-06-28 Dickson Industries, Inc. Surface blasting apparatus
JPS61197713U (de) * 1985-05-30 1986-12-10
BE1002563A3 (fr) * 1988-10-19 1991-03-26 Rutten Leon Turbine de grenaillage.
US5090162A (en) * 1990-06-13 1992-02-25 Nelson Robert T Surface treating apparatus
GB9026607D0 (en) * 1990-12-06 1991-01-23 Williams N L Eng Ltd Apparatus for surface treatment
US5142831A (en) * 1991-01-28 1992-09-01 Nelson Robert T Apparatus for treating cornered surfaces
US5205084A (en) * 1992-01-23 1993-04-27 Nelco Manufacturing Corporation Flat-walled apparatus and housing for treating horizontal surfaces
US5261192A (en) * 1992-02-14 1993-11-16 Nelco Manufacturing Corp. Surface cleaning apparatus
US5291697A (en) * 1992-06-11 1994-03-08 Nelco Acquisition Corporation Surface abrading machine having transverse oscilliation
US5498197A (en) * 1993-07-01 1996-03-12 Nelco Manufacturing Corp. Hand-held blast cleaning machine
US5441443A (en) * 1993-11-10 1995-08-15 Nelco Manufacturing Corp. Apparatus for blast cleaning surfaces disposed at angles within 45 degrees of vertical
US5584748A (en) * 1995-01-10 1996-12-17 Nelco Manufacturing Corp. Blast wheel having a rotatable shaft with radial discs and blades dovetailed across the discs
JP5732000B2 (ja) * 2012-03-23 2015-06-10 日立建機株式会社 投射材の投射装置
DE202015104319U1 (de) * 2015-08-17 2015-10-19 Stp Strahltechnik Pliezhausen Gmbh & Co. Kg Sandstrahlanlage mit oszillierendem Schleuderrad
US11498184B2 (en) 2019-07-02 2022-11-15 National Flooring Equipment, Inc. Temperature control for blast wheel housing

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008274A (en) * 1959-03-18 1961-11-14 Bell Intercontinental Corp Blasting machine
US3034262A (en) * 1959-11-05 1962-05-15 Eugene T Pawlson Resurfacing and finishing machine
US3715838A (en) * 1970-03-06 1973-02-13 Vacu Blast Ltd Apparatus for correcting misprinted matter on sheet material
US3900969A (en) * 1974-02-19 1975-08-26 Wheelabrator Frye Inc Portable apparatus for blast cleaning
US3934372A (en) * 1974-10-10 1976-01-27 Wheelabrator-Frye, Inc. Portable upblast cleaning head
US4020596A (en) * 1974-11-11 1977-05-03 Wheelabrator-Frye, Inc. Convertible blast cleaning unit
DE2708528A1 (de) * 1976-03-01 1977-09-15 Wheelabrator Frye Inc Tragbare vorrichtung zur behandlung von oberflaechen
GB1496268A (en) * 1975-04-21 1977-12-30 Worldwide Blast Cleaning Ltd Surface treating apparatus
DE2756786A1 (de) * 1976-12-20 1978-06-29 Nelson Robert Tivis Oberflaechen-behandlungsgeraet
GB1536807A (en) * 1977-08-15 1978-12-20 Worldwide Blast Cleaning Ltd Machines for blast cleaning pipes and similar cylindrical objects

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015913A (en) * 1960-06-10 1962-01-09 Pittsburgh Des Moines Steel Adjustable mounting for a centrifugal grit blasting machine
JPS5131599B2 (de) * 1971-09-06 1976-09-07
US3900968A (en) * 1971-12-10 1975-08-26 Genshichi Shigyo Mobile cleaning and polishing device
US4035958A (en) * 1973-03-30 1977-07-19 Tokyo Kosei Kaken Co. Ltd. Mobile floor cleaning and polishing device
US3864876A (en) * 1974-04-15 1975-02-11 Wheelabrator Frye Inc Fixture for a blast cleaning machine
DE2525761A1 (de) * 1975-06-10 1976-12-23 Gutmann Ges Fuer Maschinenbau Vorrichtung zum strahlen von grossraeumigen und grossflaechigen werkstuecken

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008274A (en) * 1959-03-18 1961-11-14 Bell Intercontinental Corp Blasting machine
US3034262A (en) * 1959-11-05 1962-05-15 Eugene T Pawlson Resurfacing and finishing machine
US3715838A (en) * 1970-03-06 1973-02-13 Vacu Blast Ltd Apparatus for correcting misprinted matter on sheet material
US3900969A (en) * 1974-02-19 1975-08-26 Wheelabrator Frye Inc Portable apparatus for blast cleaning
US3934372A (en) * 1974-10-10 1976-01-27 Wheelabrator-Frye, Inc. Portable upblast cleaning head
US4020596A (en) * 1974-11-11 1977-05-03 Wheelabrator-Frye, Inc. Convertible blast cleaning unit
GB1496268A (en) * 1975-04-21 1977-12-30 Worldwide Blast Cleaning Ltd Surface treating apparatus
DE2708528A1 (de) * 1976-03-01 1977-09-15 Wheelabrator Frye Inc Tragbare vorrichtung zur behandlung von oberflaechen
DE2756786A1 (de) * 1976-12-20 1978-06-29 Nelson Robert Tivis Oberflaechen-behandlungsgeraet
GB1536807A (en) * 1977-08-15 1978-12-20 Worldwide Blast Cleaning Ltd Machines for blast cleaning pipes and similar cylindrical objects

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0349490A1 (de) * 1988-07-01 1990-01-03 Aspa Zürich Ag Verfahren und Vorrichtung zur Aufbereitung von Granulaten
CH679839A5 (de) * 1988-07-01 1992-04-30 Aspa Zuerich Ag

Also Published As

Publication number Publication date
EP0032161A1 (de) 1981-07-22
HK46082A (en) 1982-11-12
NO791612L (no) 1979-11-20
BR7903080A (pt) 1979-12-04
JPS58155172A (ja) 1983-09-14
ZA792058B (en) 1980-05-28
DK204979A (da) 1979-11-20
NO820454L (no) 1979-11-20
GB1603308A (en) 1981-11-25
JPS555282A (en) 1980-01-16
CA1115528A (en) 1982-01-05
HK45982A (en) 1982-11-12
AR218723A1 (es) 1980-06-30

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Inventor name: LAKE, CHARLES WILLIAM

Inventor name: WEBER, HERB