EP0072248A2 - Tragbare Schleuderstrahlvorrichtung - Google Patents

Tragbare Schleuderstrahlvorrichtung Download PDF

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Publication number
EP0072248A2
EP0072248A2 EP82304217A EP82304217A EP0072248A2 EP 0072248 A2 EP0072248 A2 EP 0072248A2 EP 82304217 A EP82304217 A EP 82304217A EP 82304217 A EP82304217 A EP 82304217A EP 0072248 A2 EP0072248 A2 EP 0072248A2
Authority
EP
European Patent Office
Prior art keywords
gas
grit
vibrator
chamber
blasting apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82304217A
Other languages
English (en)
French (fr)
Other versions
EP0072248A3 (de
Inventor
Terence Gordon Hill
Samuel Burrows
John David Roberts
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.)
Commonwealth of Australia
Original Assignee
Commonwealth of Australia
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 Commonwealth of Australia filed Critical Commonwealth of Australia
Publication of EP0072248A2 publication Critical patent/EP0072248A2/de
Publication of EP0072248A3 publication Critical patent/EP0072248A3/de
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • This invention relates to grit blasting apparatus oi the kind which is used in surface treatment or preparation, for example before painting, welding or applying an adhesive to the surface.
  • the invention is particularly designed for use with grit blasting apparatus in which the grit is not recycled although it is not limited thereto.
  • one known non-recyclable grit blasting apparatus has included a storage vessel for grit, the grit being arranged to be fed to a gas supply line by electrically vibrating the grit storage vessel.
  • This arrangement necessitates connection of the apparatus with a source of pressurized gas as well as an electrical power supply and also the apparatus has been relatively bulky.
  • the grit blasting apparatus includes
  • the storage vessel may be of any suitable size and shape.
  • the vessel may be a cylinder having its axis generally vertical and having a removable cap allowing replenishment of the supply of grit in the vessel.
  • the cap is preferably a gas-tight seal with the vessel.
  • the cap may be arranged to be screw threaded to the outer surface of the vessel and be provided with a plug which fits within the walls of the cylindrical vessel.
  • the plug may be provided with a resilient 0-ring around its periphery so as to form a seal within the inner surface of the vessel.
  • the base of the storage vessel is in the form of a block, said base block having a conical recess in its upper surface providing a funnel for directing the grit towards said outlet means.
  • the base of the conical recess is preferably provided with at least one output hole for passing the grit.
  • the output hole may be arranged to receive an insert providing the output orifice, the output orifice in the insert being of a predetermined diameter.
  • the insert may be a press fit within the hole in the base of the conical recess. This enables ready replacement of the insert if the output orifice becomes worn by the action of the grit and also to allow replacement of the insert for different grit sizes.
  • the passage means includes a mixing chamber in the base block beneath the output orifice and communicating therewith, said mixing chamber further including a pressurized gas inlet and gas outlet located on opposite sides of the chamber.
  • a pressure equalizing tube extending from the mixing chamber through the main body of the storage vessel and opening at its upper end within the storage vessel just below the cap thereof.
  • the gas operated vibrator means associated with the vessel preferably includes a rotary vibrator member which is driven by pressurized gas.
  • the vibrator may be associated with the vessel, however preferably the vibrator is arranged to vibrate the base block.
  • the rotary vibrator member comprises a vibrator block mounted within a vibrator chamber provided in the base block.
  • the vibrator block is of smaller dimensions than the vibrator chamber so that the block can rock or vibrate within the chamber and -thereby transmit the force of the vibration to the base block itself.
  • the vibrator block may be a generally cylindrical metal block having a groove around the outside, the vibrator chamber also being cylindrical of larger diameter and slightly larger length than the block.
  • the cylindrical vibrator block and chamber may be arranged with their axes generally horizontal.
  • the means for connecting a source of gas preferably includes a gas conduit connected to the pressurised gas inlet located to one side of the vertical centre plane of the chamber say through the upper wall of the chamber, and the gas outlet is located to the other side of the vertical centre plane also through the upper wall of the chamber.
  • a vibrator block rotatably mounted on an axle fixed to the base block and eccentrically weighted, the arrangement being such that the flow of pressurized gas causes the block to rotate on the axle, the eccentric weighting causing vibration in the block through the axle.
  • the vessel may be resiliently mounted in association with a diaphragm, compression waves of relatively high frequency being produced in a gas line to a chamber closed by the diaphragm, thereby vibrating the diaphragm and hence the vessel.
  • the pressurized vibrator gas may be any suitable gas such as compressed air.
  • the compressed air after passing through the vibrator chamber may be exhausted to atmosphere, through a pneumatic silencer if desired.
  • the grit blasting apparatus of the present invention is preferably adapted to be supplied from an external source of clean dry propellant gas.
  • the propellant gas supply may be a compressor or alternatively the gas may be supplied from a cylinder of pressurized gas.
  • the propellant gas may be the same as the vibrator gas. For some applications it is desirable to use a relatively inert propellant gas and accordingly the propellant gas may be dry nitrogen supplied from a cylinder.
  • the propellant gas may be arranged to pass through a pressure relief valve, a master on/off valve and an adjustable pressure regulator, as will be readily appreciated in the art.
  • the pressure relief valve may be adjustable enabling presetting of the pressure at which the valve will open to relieve excess pressure in the propellant gas lines.
  • the pressure of propellant gas may be monitored by means of a pressure gauge which has a tapping into the propellant gas supply line downstream of the valves but upstream of the mixing chamber. After passing through the mixing chamber where the grit is entrained in the gas stream, the propellant gas is generally led through a flexible hose to a hand held nozzle.
  • the vibrator gas supply may be passed through a similar arrangement of adjustable pressure relief and on/off valves and pressure regulator as the propellant gas. Also a pressure gauge may be provided for monitoring the pressure of the vibrator gas.
  • a single gas source for suitable applications of the apparatus, i.e. the one gas source supplying both the vibrator and propellant gases.
  • a single source may have a divided outlet for the propellant and vibrator gases.
  • the gas may be passed through the valves and past the pressure gauge and thence to the vibrator chamber. After-leaving the vibrator chamber the gas may be passed into the mixing chamber and thence to the hose and nozzle.
  • the apparatus of the present invention may be included in a suitable housing enabling a compact apparatus to be provided.
  • the housing may be provided with suitable manually operable controls for starting and stopping the respective gas flows, adjusting the pressure regulators and for initial presetting of the pressure at which the relief valves operate.
  • the pressure gauges may be also mounted on the housing enabling ready monitoring of the pressure.
  • the nitrogen and air supplies are connected to the apparatus and the nitrogen and air on/off valves are opened.
  • the opening of the master on/off air valve causes air to flow through the vibrator chamber around the vibrator block thereby causing the block to rock in the chamber and transmit the vibration to the base block.
  • the storage vessel is thereby vibrated to promote falling of grit through the orifice(s) in the base block.
  • the nitrogen flowing through the mixing chamber entrains the grit and then passes out through the hose and nozzle.
  • Variation of the vibrator gas flow pressure enables vibration control so that the grit feed may be adjusted to the required rate.
  • Adjustment of the propellant gas flow pressure controls the force of the blast so that materials of differing hardness can be treated.
  • FIG. 1 An embodiment of a grit storage vessel and vibrator means according to the present invention is shown in Figure 1 of the accompanying drawings and Figure 2 shows a schematic diagram of a pneumatic circuit for the apparatus.
  • Figure 2 shows a schematic diagram of a pneumatic circuit for the apparatus.
  • the present invention is not limited to the specific arrangements shown in the accompanying drawings.
  • the grit blasting apparatus of Figure 1 comprises a storage vessel 1 for containing a body of grit.
  • the storage vessel is cylindrical and has a cap 2 providing a gas tight seal with the vessel.
  • the cap is screw threaded and is provided with a plug 3 and resilient 0-ring 4 to supply a gas-tight seal.
  • the cylindrical storage vessel 1 is mounted on a base block 5.
  • the base block has a conical recess in its upper surfaces at the base of which is an output hole 6 adapted to receive an insert 7 providing an output orifice.
  • the output orifice communicates with a mixing chamber 8 into which the grit is fed.
  • the mixing chamber is provided with a pressurised gas inlet (not shown) and gas outlet 9.
  • the grit blasting apparatus further includes a pressure equalising tube 10 extending from the mixing chamber 8 to just below the cap of the storage vessel 1.
  • the grit blasting apparatus further comprises a vibrator chamber 11 and vibrator block 12 in the base block.
  • the vibrator chamber and block are adapted to vibrate the storage vessel by means of pressurised gas passing around the vibrator block thereby causing the block to rock in the chamber and transmit the vibration to the base block 5.
  • the grit blasting apparatus may be provided with a suitable series of gas controls. Nitrogen and air supplies are connected to the grit blasting apparatus and vibrator respectively.
  • the controls include master on/off valves 13, the respective opening of which cause air to flow to the vibrator chamber and causes nitrogen to flow to the mixing chamber wherein the grit is entrained in the gas flow.
  • the controls further-include pressure relief valves 14 which may be preset to open once a critical pressure is reached.
  • the controls further include pressure regulators 15 and gauges 16 mounted downstream of the regulators.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Catching Or Destruction (AREA)
  • Coating By Spraying Or Casting (AREA)
EP82304217A 1981-08-11 1982-08-10 Tragbare Schleuderstrahlvorrichtung Withdrawn EP0072248A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU169/81 1981-08-11
AU16981 1981-08-11

Publications (2)

Publication Number Publication Date
EP0072248A2 true EP0072248A2 (de) 1983-02-16
EP0072248A3 EP0072248A3 (de) 1983-04-20

Family

ID=3691002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304217A Withdrawn EP0072248A3 (de) 1981-08-11 1982-08-10 Tragbare Schleuderstrahlvorrichtung

Country Status (3)

Country Link
EP (1) EP0072248A3 (de)
JP (1) JPS5877453A (de)
AU (1) AU8690182A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150338A2 (de) * 1983-12-08 1985-08-07 Olavi Fagerroos Mauno Trockenputzkabine
CN104858797A (zh) * 2015-03-31 2015-08-26 太仓联洲机械设备有限公司 一种喷砂房用气动放砂阀
CN115096692A (zh) * 2022-06-14 2022-09-23 北京理工大学 一种用于模拟高温高速两相流冲刷烧蚀的实验系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1140195A (en) * 1965-03-29 1969-01-15 Vibrator Mfg Company Fluid driven vibrator
CH482511A (de) * 1969-04-22 1969-12-15 Schlick Kg Heinrich Strahlmittel-Druckluft-Mischkammer für druckluftbetriebene Strahlanlagen
DE2133519A1 (de) * 1971-07-06 1973-03-15 Dental Gold Co Pneumatische schleifmittel-bearbeitungsvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1140195A (en) * 1965-03-29 1969-01-15 Vibrator Mfg Company Fluid driven vibrator
CH482511A (de) * 1969-04-22 1969-12-15 Schlick Kg Heinrich Strahlmittel-Druckluft-Mischkammer für druckluftbetriebene Strahlanlagen
DE2133519A1 (de) * 1971-07-06 1973-03-15 Dental Gold Co Pneumatische schleifmittel-bearbeitungsvorrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150338A2 (de) * 1983-12-08 1985-08-07 Olavi Fagerroos Mauno Trockenputzkabine
EP0150338A3 (de) * 1983-12-08 1986-12-30 Olavi Fagerroos Mauno Trockenputzkabine
CN104858797A (zh) * 2015-03-31 2015-08-26 太仓联洲机械设备有限公司 一种喷砂房用气动放砂阀
CN115096692A (zh) * 2022-06-14 2022-09-23 北京理工大学 一种用于模拟高温高速两相流冲刷烧蚀的实验系统

Also Published As

Publication number Publication date
AU8690182A (en) 1983-02-17
JPS5877453A (ja) 1983-05-10
EP0072248A3 (de) 1983-04-20

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19850205

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ROBERTS, JOHN DAVID

Inventor name: BURROWS, SAMUEL

Inventor name: HILL, TERENCE GORDON