WO2023006155A1 - Machine de sablage à dépression à injection d'air comprimé et procédé de traitement par sablage au moyen de cette machine de sablage à dépression - Google Patents

Machine de sablage à dépression à injection d'air comprimé et procédé de traitement par sablage au moyen de cette machine de sablage à dépression Download PDF

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Publication number
WO2023006155A1
WO2023006155A1 PCT/DE2022/100545 DE2022100545W WO2023006155A1 WO 2023006155 A1 WO2023006155 A1 WO 2023006155A1 DE 2022100545 W DE2022100545 W DE 2022100545W WO 2023006155 A1 WO2023006155 A1 WO 2023006155A1
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WO
WIPO (PCT)
Prior art keywords
compressed air
blasting
jet
suction hose
lance
Prior art date
Application number
PCT/DE2022/100545
Other languages
German (de)
English (en)
Inventor
Uwe Dyballa
Original Assignee
systeco GmbH
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 systeco GmbH filed Critical systeco GmbH
Publication of WO2023006155A1 publication Critical patent/WO2023006155A1/fr

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor
    • 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

Definitions

  • Vacuum jet machine with compressed air coupling, compressed air coupling arrangement and method for processing in particular for cleaning surfaces of natural stones, tile cleaning, facade cleaning, stair renovation, for removing paint coatings, graffiti removal, solar module cleaning and for engraving a wide variety of materials such as stone, concrete, wood, metal, plastic or Glass.
  • Such vacuum jet machines are preferably mobile but also stationary.
  • DE 19747 838 A1 discloses a generic device for the dry removal of coatings, graffiti or other surface contaminants on flat or curved surfaces by means of a vacuum jet method.
  • An abrasive or gentle blasting medium can be introduced into a hose line system with a carrying air flow, transported through this, accelerated and thrown against the surface to be treated. The blasting agent is then conveyed back into the support air flow by the generated negative pressure of 50 to 300 mbar.
  • a cleaning device is also provided. It is intended that the blasting agent-air mixture can be accelerated to a blasting speed of 20 to 80 m/s in a linear acceleration movement before it hits the surface to be treated.
  • a jet speed that can be achieved by means of a reduction in diameter is sufficient to achieve an abrasive effect on graffiti or other surface contaminants. The jet speeds that can be achieved are too low for removing or leveling hard surfaces or surface layers.
  • WO 02/058887 A1 is known as a vacuum jet surface cleaning machine. It is disclosed that the speed of the blasting media can be increased by at least one additional gas flow that is sucked in by the vacuum and is at least at atmospheric pressure in order to achieve a final speed that is significantly higher than the flow speed of the carrier air flow.
  • the blasting lance has at least one additional injector before it enters the blasting chamber for generating and introducing an additional energy pulse by sucking in at least one gas stream that is at least at atmospheric pressure and that acts on the blasting agent. It is disclosed that the hose feed line to the jet lance Atmosphere open intake ports are arranged for sucking in atmospheric air.
  • a mixing tube has about twice the diameter of the end of the hose line, so that the air flow conveyed through the suction openings creates a negative pressure that sucks in and accelerates the carrier air - blasting medium - mixture from the hose line and, additionally, through the suction openings, atmospheric air.
  • the acceleration of the carrier air - blasting medium - mixture is effected by means of the negative pressure and the adjustment of the cross sections and the intake of atmospheric air.
  • GB 2207625 A discloses a method and a device for engraving.
  • the erosive material itself is put under pressure. to generate the erosive stream from the erosive material which is removed from the receiving vessel by blowing compressed air into this vessel. Further compressed air is further mixed with the removed erosive material. Pressurizing the material in the vessel has the advantage of lowering the overall pressure of the erosive stream because less compressed air is required to move the erosive medium. As a result, less air has to be extracted from the hood.
  • vacuum jet engraving machines cannot be used for all circumstances and applications due to the possibly mobile power supply or an insufficient stationary power supply or due to special design features with regard to performance. There is a need for more power and a more intense effect, especially with multiple color applications or solid layers.
  • Vacuum jet engraving machines have the advantage of being easily moved to different locations or used anywhere. It is therefore the object of the invention, eliminating the disadvantages of the prior art, to achieve an increase in the flow rate of at least the blasting agent on a surface cleaning and engraving machine for more effective cleaning of the most varied and complicated surfaces or substrates and to maintain efficient and energy-saving operation. With the changes and additions made, the possible uses of the surface cleaning and engraving machine have been expanded.
  • a vacuum blasting machine for processing, cleaning, engraving or removing coatings, graffiti or other surface contaminants using abrasive blasting media on parts, workpieces or surfaces, which comprises a container arrangement, the container arrangement having a suction head with a dry vacuum cleaner with a fine dust filter in order to have a suction hose connection in the area of the fine dust filter on the container arrangement.
  • a collection funnel with a collection funnel outlet and an unlockable outlet flap for the collected blasting agent and a funnel-shaped storage container arranged below the outlet flap with a dosing device for the blasting agent to be used, the dosing device being connected to a carrier air supply and the carrier air supply to a Suction hose connection is performed on the container assembly.
  • a jet hood which has one, two or more viewing windows, a jet lance protruding into the jet hood and a hose connection, with a flexible suction hose being present between the suction hose connection and the jet lance and a flexible suction hose being routed from the suction hose connection to the hose connection .
  • a compressed air coupling that is independent of atmospheric pressure for coupling in or feeding in compressed air.
  • the flow speed of at least the blasting agent and thus the impact speed can be increased by the compressed air. At least a comparative doubling of the output can thus advantageously be achieved. Tests have shown that 2.5 times the performance can be achieved, which is reflected in a correspondingly halved or further reduced processing time. Advantageously, no significant additional consumption of the blasting agent was determined here. In addition, extremely problematic surfaces or layers or coatings or materials can also be processed.
  • the compressed air can be provided, for example, with a compressor or via compressed air cylinders or via a stationary compressed air system as the respective compressed air source. For this purpose, for example, a hose or a line from the respective compressed air source is provided corresponding to the compressed air coupling.
  • the container arrangement advantageously comprises, for example, three sub-containers arranged one above the other, each connected to one another by means of metal clamps and sealed airtight from one another by means of seals.
  • the suction head On the upper part of the tank, for example, the suction head is arranged as a dry vacuum cleaner with a cylindrical immersion tube and a replaceable filter cartridge fastened therein as a fine dust filter for dust separation.
  • the suction head is also sealed off from the upper part of the container and is held on the upper part of the container by means of metal clips.
  • a sieve is advantageously arranged below the collecting funnel outlet with the unlockable outlet flap for the collected blasting medium and on or above the funnel-shaped storage container. In this way, contamination or clumping of the blasting agent can be held back.
  • a dosing device is arranged in the lower partial container, for example, at the lower end of the funnel-shaped storage container.
  • This dosing device comprises nozzles with different diameters that pass through the dosing disk and are arranged offset by 45 degrees or at a different angle, for example, and to which locking positions with the same angular divisions are assigned, thereby enabling the dosing disk with its nozzles to be adjusted to a released nozzle for one desired flow rate for the blasting agent can be achieved. Only one nozzle located above a connection to the carrier air supply for the air flow allows the blasting agent to pass through or to the carrier air supply. All other nozzles are covered. The air flow in the carrier air supply entrains the abrasive in the direction of the suction hose.
  • the jet lance on the jet hood is advantageously guided and held by a rubber seal.
  • This rubber seal can be electrically conductive.
  • the edge of the jet hood which rests on the surface to be processed, advantageously has removable rubber seals with variable height and thickness.
  • This can also be additionally adjusted by adapting the contact surface of the jet hood to the surface to be treated, e.g. B. by adapting to curvatures, profile shapes and / or angles.
  • the adaptation of the contact surface does not have to match one hundred percent.
  • the rubber seals can compensate for deviations.
  • adapters are attached as attachments to the jet hood, which simulate a wide variety of shapes, such as e.g. B. semicircles with different radii for the processing of columns or posts or specially manufactured adapters for certain profiles, such. B. Moldings on doors or frames.
  • the adapters are advantageously held by bayonet locks.
  • Another aspect of the invention relates to a compressed air coupling arrangement, in particular for a vacuum blasting machine, in which case an abrasive blasting medium can be sucked into a blasting hood by means of a vacuum in a suction section via a suction hose and a blasting lance and can be sucked off again after use from the blasting hood via a suction section, with the compressed air coupling arrangement being connected to the compressed air coupling arrangement the suction hose and the jet lance can be connected, or the compressed air coupling arrangement has a connection for or a transition to a suction hose and a jet lance that are assigned to the suction area, and a suction hose or a suction device on the jet hood that is/are used for the suction extraction section is assigned, is available.
  • At least one compressed air pipe is routed from the outside through the wall into the suction hose or into the blasting lance in the suction area, or there is an intermediate piece with at least one compressed air pipe, or there is a pressure chamber with a compressed air access point and an injector pipe, with the intermediate piece or the pressure chamber between the suction hose and the jet lance is arranged.
  • the compressed air pipe or the injector pipe is aligned in the direction of flow.
  • compressed air can be coupled or fed into the suction area by means of the compressed air coupling arrangement in order to increase the flow speed of at least the blasting medium or the carrying air flow and thus the impact speed.
  • the compressed air coupling arrangement in the compressed air coupling in the pressure chamber includes a compressed air access and an injector tube in the direction of flow
  • the intake hose is guided to the injector tube and the The blasting lance is at least connected to the pressure chamber in a fixed, releasable or movable manner or is plugged into the pressure chamber in a fixed, releasable or movable manner and the injector tube is guided or aligned in the area of or up to the blasting lance.
  • the wear or abrasive influence of the blasting medium on the compressed air coupling can be minimized.
  • the compressed air can also act in a directed and direct manner on the blasting agent or the carrying air flow and accelerate the blasting agent or the carrying air flow during the vacuum blasting process.
  • the injector tube can be displaced in the direction of flow, so that the volume, pressure and the speed and influence of the compressed air and thus its effect on the blasting agent or the carrier air flow during the vacuum blasting process can be varied.
  • the compressed air coupling arrangement can advantageously be used on any vacuum jet surface cleaning machines or vacuum jet engraving machines in order to increase the speed of at least the blasting medium and thus increase the performance on and with these surface cleaning and engraving machines.
  • the object of the invention is also achieved by a method for blasting to process, clean, engrave or remove coatings, graffiti or other surface contaminants using abrasive blasting agents on parts, workpieces or surfaces using the vacuum blasting machine according to the invention or the compressed air coupling arrangement according to the invention, in which a blasting agent metered into a carrier air flow generated by negative pressure by means of gravity and/or suction, conveyed in a suction hose to a blasting lance and into a blasting chamber and directed onto a processing surface, from there conveyed back into the air flow via a suction hose, cleaned and collected and cyclically or acyclically is driven in the circuit, the acceleration of the blasting medium generated by the negative pressure and the blasting chamber is implemented from processing surface to processing surface, according to the invention an additional che acceleration of the blasting agent takes place by coupling or feeding in compressed air to achieve a final speed of the blasting agent that is significantly higher than the flow rate of the carrier air flow.
  • the compressed air coupling does not eliminate the negative pressure that is built up or generated by the suction head with the dry vacuum cleaner or in any other way.
  • the cross section of the compressed air coupling is advantageously smaller or significantly smaller than the cross section in the intake section in which the compressed air coupling is provided, for example as an intermediate piece or the suction hose or the jet lance. This leads to a pressure loss at or in the compressed air coupling.
  • any compressed air sources can also be provided, the use of which does not eliminate the negative pressure that is built up or generated by the suction head with the dry vacuum cleaner.
  • throttling can also be provided to reduce the pressure of the compressed air on or in the compressed air coupling.
  • the cross section of the compressed air coupling and the cross section in the suction section in which the compressed air coupling is provided can also be matched to one another.
  • another gas for example an inert gas or nitrogen, can advantageously be used.
  • an inert gas or nitrogen can advantageously be used. In this way, in addition to oxidative reactions, explosions or the ignition of substances can also be avoided.
  • the acceleration and the effect of the acceleration can be individually adjusted.
  • the compressed air coupling between the suction hose and the blasting lance is present in an intermediate piece or in a pressure chamber on the vacuum blasting machine consider and arrange the compressed air coupling as a supplement or accessory on a surface cleaning and engraving machine as required.
  • the compressed air coupling, the suction hose and the jet lance can be exchanged if necessary.
  • the compressed air coupling on the vacuum blasting machine and/or the compressed air coupling arrangement comprises at least one compressed air pipe, with the at least one compressed air pipe being guided from the outside into the intermediate piece, into the suction hose or into the blasting lance and aligned in the direction of flow, so that the compressed air is directed and act directly on the blasting agent or the carrier air flow and can accelerate the blasting agent or the carrier air flow.
  • the compressed air coupling in the pressure chamber comprises a compressed air access point and an injector tube in the direction of flow, with the intake hose being routed to the injector tube and the jet lance being connected to the pressure chamber in a fixed, detachable or movable manner or being inserted into the pressure chamber in a fixed, detachable or movable manner and the injector tube is guided or aligned in the area of or up to the jet lance.
  • the compressed air can also act in a directed and direct manner on the blasting agent or the carrier air flow and accelerate the blasting agent or the carrier air flow during the vacuum blasting process.
  • the injector tube can be moved in the direction of flow, so that the volume, pressure and speed of the compressed air and thus their effect on the blasting medium or the carrier air flow during the vacuum blasting process can be varied.
  • the at least one compressed air pipe By arranging the at least one compressed air pipe on the vacuum blasting machine and/or the compressed air coupling arrangement concentrically or on the inner wall or in the case of two or more compressed air pipes evenly or unevenly distributed in the adapter, in the suction hose or in the blasting lance, the effect or influence of the coupling or the Feeding the compressed air to the blasting agent or the carrier air flow can be advantageously adjusted.
  • the alternative compressed air coupling of the compressed air coupling arrangement with pressure chamber, compressed air access and injector tube provides as an alternative that the Injector tube is tapered at least at the jet lance end and in this area on the outer circumference or in or on the outer surface of the injector tube has slit-like or groove-like recesses or spaced elevations with slit-like or groove-like spaces in the direction of flow or longitudinal direction. Furthermore, the end of the injector tube on the jet lance side is connected or in contact with the pressure chamber or is inserted into it.
  • a further alternative provides that the injector tube is tapered at least at the jet lance-side end and that the pressure chamber in the area of the connected or plugged tapered injector tube has slot-like or groove-like recesses distributed on the inner circumference or spaced elevations with slot-like or groove-like spaces in the direction of flow or longitudinal direction.
  • slit-like or groove-like recesses or spaced elevations with slit-like or groove-like spaces form a rib-like or ring-like structure or surface structure distributed over the outer circumference or inner circumference and aligned in the direction of flow, through which the compressed air passes from the pressure chamber into the jet lance.
  • the compressed air for example as an air cushion on the inner wall
  • the compressed air also flows through the interstices of the rib-like structure or surface structure and through the taper and/or a convex or concave curvature of the injector tube and/or the pressure chamber in the area of the taper at the jet lance-side end of the blasting lance, which leads to a reduction in wear and tear on the blasting lance during the vacuum blasting process.
  • the interstices of the rib-like or ring-like structure or surface structure in the area of the taper at the jet lance-side end of the injector tube or on the pressure chamber and the fact that the injector tube can be displaced or moved in the direction of flow improve dosing and adaptation by means of adjustable or changeable cross sections of the compressed air coupling favored depending on the negative pressure in the negative pressure blasting process.
  • the injector tube or the pressure chamber with the rib-like structure or surface structure in the area of the narrowing of the injector tube can be adapted or provided or exchanged to the respective application and the existing or possible negative pressure, as required.
  • the at least one compressed air pipe on the vacuum blasting machine and/or the compressed air coupling arrangement has a round and/or square or a structured cross-section and/or wear protection at least in some areas, the effect or influence of the coupling or the feeding of the compressed air on the blasting agent or the Carrying air flow can be further adjusted advantageously.
  • the at least one compressed air pipe has wear protection at least in some areas, as a result of which the abrasive influence of the blasting agent on or on the compressed air pipe can be minimized.
  • the effect or influence of the coupling or feeding of the compressed air to the blasting agent or the carrier air flow can be further advantageously adjusted.
  • the compressed air coupling or the compressed air access has a valve, whereby the coupling or the feeding of the compressed air can take place as required.
  • a valve that can be actuated by hand, for example on the adapter or on the jet lance or on the suction hose, or, for example, a valve that can be actuated by foot, comes into consideration.
  • the appropriate valve is connected to the appropriate hose or line from the appropriate compressed air source.
  • the coupling or feeding of the compressed air can be interrupted if the vacuum in the jet hood is removed or interrupted by opening the ventilation device. This is necessary, for example, if the jet hood on the processing area is to be moved or shifted from one processing point to another processing point or removed or lifted from the processing point. This avoids the blasting agent still in the suction hose or in the blasting lance being transported or accelerated by the compressed air when the blasting hood is removed. This improves accident protection and prevents contamination or unwanted distribution of blasting media.
  • the ventilation device can, for example, be an actuatable flap on the jet hood. The opening or changing of the position of the flap can be detected and the valve can be controlled or a control of the valve can be triggered via contacts or transmitters.
  • a pressure sensor or a pressure regulator or a differential pressure detector is present, so that if the vacuum is insufficient, the mode of operation of the vacuum blasting machine can be influenced or adjusted if, for example, the blast hood can no longer reliably adhere to the processing surface .
  • the pressure regulator or the pressure control it can advantageously be provided that, when operating with compressed air, the suction quantity is greater than the quantity of media or compressed air supplied.
  • a pressure-controlled or pressure-dependent valve is advantageously present in the compressed air supply line in addition to the manual valve.
  • the compressed air is coupled or fed into the suction hose or the blasting lance or into an intermediate piece or into a pressure chamber with an injector tube between the suction hose or the blasting lance, so that the flow rate of the carrier air flow increases and is increased by the acceleration associated with the compressed air so that the final speed of the blasting medium is also increased.
  • the compressed air is coupled in or fed in as close as possible to the jet hood or on or in the jet lance. Deflections of the additionally accelerated blasting medium or carrier air flow due to bends in the intake section can be avoided.
  • the compressed air is coupled or fed in continuously, discontinuously or in pulses or depending on the pressure, different requirements or needs can be catered for as required.
  • the compressed air can be fed in or coupled in individually in the event of changing substrates or contamination or coatings.
  • Fig. 1 a vacuum jet machine with jet hood and connecting hoses and with compressed air coupling as an intermediate piece between suction hose and jet lance as a schematic representation
  • FIG. 2 shows the detailed representation of a compressed air coupling as an intermediate piece between the suction hose and jet lance as a schematic representation
  • FIG. 3 shows the detailed representation of a compressed air coupling in the intake hose as a schematic representation
  • FIG. 5 shows the detailed representation of a compressed air coupling as an intermediate piece between the suction hose and jet lance and wear protection as a schematic representation
  • FIG. 6 shows the detailed representation of a compressed air coupling in the blasting lance and wear protection as a schematic representation
  • FIG. 7 shows the detailed representation of a compressed air coupling with pressure chamber and injector tube as a schematic representation
  • FIG. 8 shows the detailed representation of the section in FIG. 7 as a detailed representation of a pressure chamber and an injector tube
  • FIG. 9 shows the detailed representation as a section as a detailed representation of a pressure chamber and an injector tube.
  • the vacuum blasting machine for processing, cleaning, engraving or removing coatings, graffiti or other surface contaminants using abrasive blasting media 2 on parts 8, workpieces 8 or surfaces 8 is mobile and, for example, mounted on a carriage 16 for this purpose.
  • the vacuum jet machine comprises a container arrangement 15, the container arrangement 15 being advantageously divided into three, for example, and an upper partial container 15.1, a middle partial container 15.2 and a lower partial container 15.3. having.
  • the suction head 14 also has operating elements 20 and display instruments 20 . All sub-containers 15.1, 15.2, 15.3 and the suction head 14 are manually operable metal brackets 17 and / or.
  • Bayonet locks 17 connected and can be quickly separated from each other for maintenance and put back together.
  • the jet hood 6 has one, two or more viewing windows 9, a jet lance 7 and a hose connection 25, with a flexible suction hose 5 being present between the suction hose connection 21 and the jet lance 7 and a flexible suction hose
  • a flexible suction hose 10 which is guided from a hose connection 25 on the jet hood 6 to the suction hose connection 22, is connected.
  • a collecting funnel 23 is arranged in the middle partial container 15.2 of the container arrangement 15, at its lower outlet a collecting funnel outlet with an unlockable outlet flap 12 and in the lower partial container 15.3 of the container arrangement 15 a funnel-shaped storage container 1 with a dosing device 3 is arranged.
  • a dosing device 3 with nozzles of different sizes for the blasting agent 2 to be used and its metered addition to a supporting air supply 4 .
  • the nozzle size determines the amount of blasting agent 2 that later emerges from the blasting lance 7 and is available for processing the surface 8 to be processed.
  • the dosing device 3 is connected to the carrier air supply 4 .
  • the carrier air supply 4 is routed to an intake hose connection 21 on the container arrangement 15 .
  • a flexible suction hose 5 is provided from the suction hose connection 21 to the jet lance 7 on the jet hood 6 .
  • a compressed air coupling 28 which is independent of the atmospheric pressure.
  • at least one compressed air pipe 29 is guided from the outside through the respective wall and aligned in the direction of flow 30 either in the suction hose 5, as shown in FIG. 3, or in the jet lance 7, as shown in FIG.
  • an intermediate piece 28a can also be present according to the invention, with the at least one compressed air pipe 29 being guided into the intermediate piece 28a from the outside and being aligned in the flow direction 30 .
  • the at least one compressed air pipe 29 is round and arranged concentrically in the intermediate piece 28a, in the suction hose 5 or in the jet lance 7.
  • the at least one compressed air pipe 29 can be arranged concentrically or on the inner wall or, in the case of two or more compressed air pipes 29 , evenly or unevenly distributed in the intermediate piece 28a, in the suction hose 5 or in the jet lance 7 .
  • the compressed air pipe 29 can have a round and/or angular or a structured, for example flat or curved, cross section.
  • the dry vacuum cleaner of the suction head 14 with the fine dust filter 11 creates a negative pressure and sucks the blasting agent 2 through the support air supply 4, the suction hose 5 and the blasting lance 7 into the blasting hood 6 and it is directed onto a processing surface 8.
  • the compressed air coupling 28 results in additional acceleration of the blasting agent 2 by an active coupling or an active feeding in of compressed air 27, as a result of which a final speed of the blasting agent 2 that is significantly higher than the flow rate of the carrier air flow is achieved. In this case, the suction head 14 produced by the dry vacuum cleaner is suppressed and its effect is unaffected.
  • the cross section of the compressed air coupling 28 is smaller than the cross section of the intermediate piece 28a, the suction hose 5 or the jet lance 7 or can be adjusted or reduced, for example, and thus reduces the pressure of the compressed air 27 in order not to cancel the negative pressure.
  • the compressed air 27 is provided by a compressed air source 27 .
  • the compressed air source 27 can be a compressor or compressed air cylinders or an arrangement of compressed air cylinders or an installed compressed air system, as is common in workshops, for example.
  • a compressed air supply line 27a leads from the respective compressed air source 27 to a valve 26.
  • the valve 26 can be a foot valve or manual valve, for example connected directly to the compressed air coupling 28 or to the compressed air pipe 28a.
  • valve 26 is coupled to an aeration device 24 on the jet hood 6, so that the coupling or feeding of the compressed air is interrupted if the negative pressure in the jet hood 6 is increased by opening the aeration device 24 for the Transfer or withdraw is canceled or interrupted.
  • the blasting agent 2 in the blasting hood 6 After the blasting agent 2 in the blasting hood 6 has been directed onto a processing surface 8, the blasting agent 2 and the removed dirt particles 19 are discharged from the blasting hood 6 into the air flow of the negative pressure via a suction hose 10 into the container arrangement 15 in the upper part container 15.1 to the Suction hose connection 22 is returned in the area of the fine dust filter 11.
  • the fine dust is collected on the fine dust filter 11, larger dirt particles 19 and the blasting agent 2 fall into the collection funnel 23 of the outlet flap 12, which is initially locked, ie closed, and are collected there. Cyclically, especially when the storage container is empty, the dirt particles 19 and the blasting agent 2 fall through the collection funnel outlet when the outlet flap 12 is unlocked onto a sieve 13 above the storage container 1. The dirt particles 19 can be disposed of from there later, while the blasting agent 2 passes through the sieve in the reservoir 1 reaches or falls.
  • the edge of the jet hood 6 to the surface 8 to be processed is advantageously provided with removable sealing rubbers 18 made of sponge rubber with variable height, thickness and rigidity or several layers of sealing rubber 18 one on top of the other. These rubber seals 18 are preferably connected to one another or to the jet hood 6 by means of Velcro.
  • the bearing surface of the jet hood 6 can be used for processing surface 8 z. B. in terms of curvature, profile design and angle.
  • attachments can be attached as adapters to the jet hood 6, which have a wide variety of shapes, adapted to the shapes of the surfaces to be machined 8, parts 8, workpieces 8, such as e.g. B. curves, columns, housing, angled outer surfaces or inner surfaces, etc.
  • the compressed air coupling arrangement provides, in particular for a vacuum blasting machine, in which an abrasive blasting agent can be sucked into a blasting hood 6 by means of a vacuum and sucked out of the blasting hood 6 again after use, with a suction hose 5, a blasting lance 7 and a suction hose 10 being present, that at least a compressed air pipe 29 is routed from the outside through the wall into the suction hose 5 or into the blasting lance 7, or that there is an intermediate piece 28a with at least one compressed air pipe 29, with the intermediate piece 28a being arranged between the suction hose 5 and the blasting lance 7, and the compressed air pipe 29 is aligned in the direction of flow 30 .
  • Compressed air coupling can be provided for any vacuum blasting machine, provided that the effect of the vacuum is not adversely changed.
  • the compressed air pipe 29 With regard to the compressed air pipe 29, its number, arrangement and distribution as well as its shape and cross-section, reference can be made to the statements made above.
  • a valve 26 can also be present on the compressed air coupling arrangement according to the invention in a compressed air supply line 27a from a compressed air source 27 and, if necessary, the valve 26 can be coupled to a ventilation device 24 on the jet hood 6 .
  • FIG. 5 shows the detailed representation of a compressed air coupling 28 of a compressed air coupling arrangement with an intermediate piece 28a, which is arranged between the suction hose 5 and the jet lance 7.
  • This compressed air coupling 28 essentially corresponds to the compressed air coupling 28 shown in FIG.
  • the compressed air pipe 29 has a wear protection 33 in some areas, which is present as a jacket or coating or forms a structural unit with the intermediate piece 28a and the compressed air pipe 29 is guided through the wear protection 33 .
  • the valve 26 and the compressed air supply line 27a are present on the compressed air pipe 29 downstream.
  • the compressed air pipe 29 protrudes into the jet lance 7.
  • a simplified compressed air coupling 28 is a
  • the jet lance 7 has a region 35 which is widened compared to the jet lance 7 and has the compressed air coupling 28 , the suction hose 5 being connected to a connecting piece 34 for the suction hose 5 .
  • the compressed air pipe 29 is concentric to the jet lance 7 and aligned in the direction of flow introduced from the outside.
  • the compressed air pipe 29 has wear protection 33 at least in certain areas.
  • FIG. 7 shows a further embodiment of a compressed air coupling 28 of a compressed air coupling arrangement.
  • the compressed air coupling 28 has a pressure chamber 31 with a compressed air access 27a and an injector tube 32 .
  • the intake hose 5 is routed to the injector tube 32 or attached or attached.
  • the jet lance 7 is attached to or in a receptacle 36 on the pressure chamber 31 and is thus connected to the pressure chamber 31 .
  • the injector tube 32 is tapered at the jet lance end and has slit-like or groove-like recesses 37 or spaced-apart elevations 38 with slit-like or groove-like intermediate spaces 37 which are aligned in the flow direction or longitudinal direction distributed on the outer circumference.
  • the flow conditions of the compressed air 27 and their influence on the blasting agent can be improved by adapting the end of the injector tube 32 that tapers on the jet lance side, for example by making the tapering end of the injector tube 32 convex or concave and by the rib-like structure or surface structure.
  • Figure 8 shows a sectional view of a section of Figure 7.
  • the injector tube 32 is connected or in contact with the pressure chamber 31 at the tapered end reach.
  • the suction quantity is greater than the quantity of media or compressed air supplied.
  • the method according to the invention for blasting for processing, cleaning, engraving or removing coatings, graffiti or other surface contamination by means of abrasive blasting agents on parts 8, workpieces 8 or surfaces 8 using a vacuum blasting machine according to the invention or a compressed air coupling arrangement according to the invention is a blasting agent 2 in a through Negatively generated supporting air flow metered by gravity and / or suction.
  • the blasting agent is conveyed in a suction hose 5 to a blasting lance 7 and into a blasting chamber 6 and directed onto a processing surface 8 . From there, the blasting agent is conveyed back into the air flow via a suction hose 10, cleaned and collected and circulated cyclically or acyclically.
  • the blasting agent 2 is accelerated by the vacuum.
  • the blasting chamber 6 is converted from processing surface 8 to processing surface 8 .
  • the blasting agent is additionally accelerated by actively coupling or feeding in compressed air 27 in order to achieve a final speed of the blasting agent 2 that is significantly higher than the flow rate of the carrier air flow, with the coupling or feeding of the compressed air 27 being continuous, discontinuous or pulsed or pressure-dependent. Compilation of the reference numbers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Cleaning In General (AREA)

Abstract

L'invention vise à pallier les inconvénients de l'état de la technique pour une machine à nettoyer et à graver des surfaces, de manière à augmenter la vitesse d'écoulement au moins de l'agent de sablage pour effectuer un nettoyage plus efficace de surfaces ou de substrats les plus divers et complexes et à maintenir un fonctionnement efficace et économe en énergie. Les modifications et compléments apportés permettent d'élargir les possibilités d'utilisation de la machine à nettoyer et à graver des surfaces. L'invention concerne un dispositif d'injection d'air comprimé, en particulier pour une machine de sablage à dépression, un agent de sablage abrasif pouvant être aspiré dans un capot de projection (6) et être éjecté du capot de projection (6) après utilisation, par dépression, un flexible d'aspiration (5), une lance de projection (7) et un flexible d'évacuation par aspiration (10) étant présents, ledit dispositif d'injection d'air comprimé se caractérisant en ce qu'au moins un tuyau d'air comprimé (29) est guidé de l'extérieur à travers la paroi jusque dans le flexible d'aspiration (5) ou jusque dans la lance de projection (7) ou en ce qu'une pièce intermédiaire (28a) comportant au moins un tuyau d'air comprimé (29) est présente, la pièce intermédiaire (28a) étant disposée entre le flexible d'aspiration (5) et la lance de projection (7), et le tuyau d'air comprimé (29) étant orienté dans le sens d'écoulement (30).
PCT/DE2022/100545 2021-07-29 2022-07-28 Machine de sablage à dépression à injection d'air comprimé et procédé de traitement par sablage au moyen de cette machine de sablage à dépression WO2023006155A1 (fr)

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DE102021119794.5 2021-07-29

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624080A (en) * 1983-01-13 1986-11-25 Bilskade-Service Hb Arrangement for use with blasting equipment
US4646480A (en) * 1985-10-23 1987-03-03 Inventive Machine Corporation Pressurized abrasive cleaning device for use with plastic abrasive particles
GB2207625A (en) 1987-07-20 1989-02-08 Michael John Ryan Engraving by blasting with erosine material
NL9400371A (nl) * 1994-03-09 1995-10-02 Kentex International Graveerinrichting.
DE19747838A1 (de) 1997-10-19 1999-04-22 Gerard Pieper Verfahren und Vorrichtung zum trockenen Entfernen von Beschichtungen, Graffiti oder sonstigen oberflächlichen Verunreinigungen
US5947800A (en) * 1997-03-10 1999-09-07 Empire Abrasive Equipment Company Pneumatic suction surface blasting apparatus with an improved media delivery regulating system
WO2002058887A1 (fr) 2001-01-23 2002-08-01 Pieper Innovationsgesellschaft Mbh Procede et dispositif pour le sablage, notamment l'enlevement et/ou le compactage et/ou l'enduction de surfaces fixes, avec un suivi precis de leur forme
US6848979B2 (en) * 2000-12-11 2005-02-01 Paul Michael Fennessy Concrete blasting device with clear wand, stiff brush, recovery cylinder, and recirculating cylinder
WO2020088717A1 (fr) * 2018-11-04 2020-05-07 systeco GmbH Machine de nettoyage de surfaces et à graver à l'aide d'un procédé de sablage sous vide

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624080A (en) * 1983-01-13 1986-11-25 Bilskade-Service Hb Arrangement for use with blasting equipment
US4646480A (en) * 1985-10-23 1987-03-03 Inventive Machine Corporation Pressurized abrasive cleaning device for use with plastic abrasive particles
GB2207625A (en) 1987-07-20 1989-02-08 Michael John Ryan Engraving by blasting with erosine material
NL9400371A (nl) * 1994-03-09 1995-10-02 Kentex International Graveerinrichting.
US5947800A (en) * 1997-03-10 1999-09-07 Empire Abrasive Equipment Company Pneumatic suction surface blasting apparatus with an improved media delivery regulating system
DE19747838A1 (de) 1997-10-19 1999-04-22 Gerard Pieper Verfahren und Vorrichtung zum trockenen Entfernen von Beschichtungen, Graffiti oder sonstigen oberflächlichen Verunreinigungen
US6848979B2 (en) * 2000-12-11 2005-02-01 Paul Michael Fennessy Concrete blasting device with clear wand, stiff brush, recovery cylinder, and recirculating cylinder
WO2002058887A1 (fr) 2001-01-23 2002-08-01 Pieper Innovationsgesellschaft Mbh Procede et dispositif pour le sablage, notamment l'enlevement et/ou le compactage et/ou l'enduction de surfaces fixes, avec un suivi precis de leur forme
WO2020088717A1 (fr) * 2018-11-04 2020-05-07 systeco GmbH Machine de nettoyage de surfaces et à graver à l'aide d'un procédé de sablage sous vide

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