EP0574771B1 - Abrasive plant - Google Patents

Abrasive plant Download PDF

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Publication number
EP0574771B1
EP0574771B1 EP93108884A EP93108884A EP0574771B1 EP 0574771 B1 EP0574771 B1 EP 0574771B1 EP 93108884 A EP93108884 A EP 93108884A EP 93108884 A EP93108884 A EP 93108884A EP 0574771 B1 EP0574771 B1 EP 0574771B1
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EP
European Patent Office
Prior art keywords
storage tank
conduit
abrasive
tube
diffuser
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
Application number
EP93108884A
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German (de)
French (fr)
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EP0574771A1 (en
Inventor
Ivan Markocic
Aleksander Gerbec
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Individual
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Individual
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Publication date
Priority claimed from SI9200122A external-priority patent/SI9200122A/en
Priority claimed from SI9300204A external-priority patent/SI9300204A1/en
Application filed by Individual filed Critical Individual
Publication of EP0574771A1 publication Critical patent/EP0574771A1/en
Application granted granted Critical
Publication of EP0574771B1 publication Critical patent/EP0574771B1/en
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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
    • B24C3/062—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable for vertical surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/45—Scale remover or preventor
    • Y10T29/4506—Scale remover or preventor for hollow workpiece
    • Y10T29/4511—Interior surface

Definitions

  • the present invention relates to an abrasive system for surface treatment using an abrasive. More specifically, the object according to the invention falls in the field of surface treatment by grinding or similar blasting with particulate material.
  • An abrasive system e.g. for irradiating the inner surfaces of pipes has become known from US 3,824,738.
  • the blasting medium and the material blasted from the tube are sucked off from a free end of the tube by means of air flow generated by a rotating wheel during the blasting process.
  • the system has a carriage which can be extended and retracted into or out of a tube, a centrifugal wheel which is rotatably mounted on a tubular housing, the latter being arranged on the front part of the carriage, a screw conveyor for supplying abrasive to the centrifugal wheel and one behind the Casing arranged on the centrifugal wheel in order to reduce the usable pipe cross section.
  • the rotating centrifugal wheel is inserted into the free tube end and, as it moves through the tube, creates an air flow that drives out the abrasive and the material blasted from the tube through the opposite free tube end.
  • the abrasive is then separated from the material that was blasted from one pipe and applied to other pipes.
  • a disadvantage of the system mentioned is that when the pipes are blasted, the length of which is usually between 6 and 12 m, it takes up a relatively large area in plan view.
  • the length of the system is namely at least twice the pipe length, i.e. the length of the tube and that of the mandrel to which the carriage is attached, which takes up relatively large spaces for arranging such systems.
  • Another disadvantage of the known system is that the length of the delivery line, through which the abrasive is returned from the pipe outlet to the storage boiler, is relatively large and even three to four times the length of the irradiated pipe. As a result, the individual components are these Delivery line is exposed to a large amount of wear from the abrasive, which significantly shortens its life.
  • a blasting agent system is known from DE-B-11 42 298.
  • This system has a centrifugal turbine as a centrifugal device, an abrasive being thrown onto a surface of a workpiece by means of the centrifugal device, an abrasive storage tank having the same longitudinal axis as the centrifugal device and being in the area immediately below the centrifugal device, and the abrasive from the storage tank in the centrifugal device is conveyed by means of a conveying device.
  • the object of the invention is to develop the known abrasive system so that a simple and effective return of abrasive is possible.
  • a blasting agent storage vessel with the same longitudinal axis as a centrifugal turbine or a centrifugal diffuser is arranged and lies in the area immediately below.
  • the blasting agent is fed from the storage boiler either into the turbine or the diffuser through a relatively short delivery pipe which connects the turbine or the diffuser to the storage boiler.
  • the abrasive is conveyed through the tube in various ways; e.g. by means of a conveying air flow which is generated by the suction effect of the turbine or the diffuser and / or is introduced through a binding blow-in tube, or by means of a screw conveyor which is arranged in the said conveying tube.
  • An embodiment of the blasting agent system according to the invention has an injector centrifugal diffuser, to which a pipe socket is assigned at the first longitudinal entry end and a delivery pipe at the second longitudinal entry end.
  • the free end of the latter is closed off by means of a basket-like storage kettle, the delivery pipe being equipped with a series of radial cutouts in the region of the connection to the bottom of the storage kettle.
  • the inner sides of the pipe socket and the delivery pipe are connected to one another by a binding blow-in pipe which essentially projects into the delivery pipe through the bottom of the storage tank.
  • the latter is formed with a series of radial recesses in the area of its free end.
  • the conveyor tube is connected at one end to a suction side of the turbine-like centrifugal device and at its other end, ie the free end, to the bottom of the basket-like storage vessel.
  • a rotatable loosening pipe Coaxial with the feed pipe and forming a clearance fit, there is a rotatable loosening pipe which is fixedly connected to the rotor and is formed at its free end, in the area of the recesses on the feed pipe, with a row of evenly spaced loosening teeth at the end.
  • the rotor is assigned an axially non-rotatable tube which, with its opposite end, penetrates the bottom of the storage vessel and forms a firm connection with the bottom.
  • a rotatable elevator tube is arranged coaxially with said tube and is provided with a screw on its inner surface.
  • the elevator tube is fixedly connected to the rotor and extends in the longitudinal direction essentially to the bottom of the storage vessel, a distance being provided between the latter and the free end of the tube.
  • the system according to the invention can e.g. be used to irradiate the flat outer surface, in this embodiment both the centrifugal turbine or the diffuser and the reservoir are arranged in a housing.
  • this has a correspondingly designed outlet opening for the blasting agent, which is encased with a suitable protective shield that fits the treated surface.
  • the blasting agent is fed from the area of the bottom of the storage vessel into the centrifugal turbine or the diffuser through a relatively short delivery pipe, one of the delivery types described above being able to be used for this.
  • that part of the jacket wall of the basket-like storage vessel which is closer to the centrifugal device in the axial direction is essentially designed as a radially flexible fine grid, to which a funnel-shaped shield made of elastic material and radially flexible is assigned in the axial direction.
  • the abrasive storage tank mentioned can also be designed as a cyclone separator.
  • a blasting agent system according to the invention is shown as a system for blasting the inner surfaces of pipes.
  • Such a system for irradiating the inner surfaces of pipes can also be used as a system for irradiating flat outer surfaces either of pipes or workpieces of different profiles, flat workpieces, such as e.g. Ship flanks, etc. can be used.
  • An abrasive system for e.g. Irradiation of the inner surfaces of pipes consists of an injector centrifugal diffuser 1, which is assigned a pipe socket 2 at its first longitudinal end, possibly the upper one. Its free end serves to receive a flexible supply hose of pressurized drive air, which is known per se and is not shown in the drawing.
  • the other longitudinal entry end of the injector diffuser 1, possibly the lower one, is assigned a delivery pipe 3, the free end of which is closed off with a blasting agent supply vessel 4 in such a way that the delivery pipe 3 is centered on the bottom of the supply vessel 4 and its jacket wall in the direction toward the diffuser 1 diverges, is arranged.
  • the delivery pipe 3 is equipped with a series of radial cutouts 5 which serve for the entry of the blasting agent.
  • the inside of the pipe socket 2 and that of the delivery pipe 3 are connected by means of a binding blow-in pipe 6, the latter being connected to the pipe connection 2 in the region of the upper end of the injector diffuser 1 and protruding through the bottom of the storage vessel 4 into the delivery pipe 3.
  • the jacket wall part of the basket-like storage vessel 4, which is located in the vicinity of the injector diffuser 1, is essentially seen in the axial direction as a radially flexible fine grid 7, which is only permeable to the dust particles formed during the irradiation. Furthermore, the said fine grid 7 is in the axial direction made of elastic material and also radially flexible funnel-shaped shield 8 is assigned, which lies close to the inner surface of the tube 9 to be irradiated during operation of the system according to the invention.
  • a pair of ribs 10 is arranged, on each of which a guide wheel unit 10 'is arranged.
  • This has a known, spring-supported lever 11 which is rotatably mounted in the radial direction of the tube 9 and on the free end of which a support wheel 12 is rotatably mounted.
  • the respective lever 11 is guided radially by means of a rod-shaped guide 13, which is rotatably mounted on the respective rib 10, a compression spring 14 being attached, which is arranged between the respective lever 11 and the rib 10.
  • a fastening projection 15 is arranged on the side of the bottom of the storage vessel 4 facing away from radial recesses 5 of the delivery pipe 3, said fastening projection having a pair of opposing ribs 10, on which the wheel unit 10 ′ described above is arranged.
  • the inner surface of the tube 9 is irradiated in either a horizontal or vertical position, etc. such that the system in question is pushed into the tube 9 according to the invention, being leaned closely against the wall of the tube 9 with pairs of wheel units 10 'and the radially flexible shield 8.
  • the compressed air flow (arrow A) is supplied to the pipe socket 2 through a supply line (not shown in more detail), which partially flows through the bottom of the storage boiler 4 via the binding blow-in pipe 6 (arrow B). This, the so-called primary compressed air flow, sucks the blasting medium through the radial recesses 5 of the delivery pipe 3 and pushes it upwards through the latter.
  • the secondary compressed air flow also contributes to this, ie the compressed air flow that remains in the pipe socket 2 after the primary compressed air flow has been discharged via the binding blow-in pipe 6.
  • the secondary compressed air flow flows through the diffuser 1 (arrow C), forming an overpressure in the storage vessel 4, which, as already mentioned, pushes the blasting agent additionally through the cutouts 5 (arrow D).
  • the secondary compressed air flow that flows through the diffuser 1 also creates a negative pressure in the delivery pipe 3, which additionally accelerates the flow of the blasting agent, which is thrown radially against the inner surface of the pipe 9 by the rapid compressed air flow (arrow E).
  • the blasting agent then falls into the storage vessel 4 and the dust particles are pushed through the fine grid 7 by means of the compressed air flow.
  • the blasting agent system according to the invention is pushed along the tube 9 until the entire inner surface is irradiated.
  • FIG. 2 Another exemplary embodiment of the system according to the invention has a turbine-like centrifugal device 16 known per se, which consists of a stator 17 and a pneumatically driven rotor 18 (not shown in detail in FIG. 2).
  • the rotor 18 is assigned the rotationally fixed delivery pipe 3, which, like in the first exemplary embodiment, is formed with a series of radial recesses 5 in the region of its free end and is connected with its first end to the suction side of the turbine device 16.
  • the other i.e.
  • the free end of the tube 3 is attached to the bottom of the basket-like storage vessel 4, which, as in the first exemplary embodiment, is associated with the essentially radially flexible fine grid 7, which is permeable only to the dust particles formed during irradiation. Furthermore, the aforementioned fine grid 7 is associated in the axial direction with the funnel-shaped shield 8, which is made of elastic material and is also radially flexible, and which, when the system according to the invention is in operation, rests closely against the inner surface of the tube 9 to be irradiated.
  • the loosening tube 19 is formed on the end face with a row of evenly spaced loosening teeth 20.
  • the storage vessel 4 is formed on the side of its bottom facing away from the radial recesses 5 of the delivery pipe 3 and the stator 17 on its side facing away from the suction side of the device 16 each with a projection 21, 21 ′ which has a pair of radial ribs 22, on which the wheel unit 10 'described above is arranged.
  • the inner surface of the tube 9 is irradiated essentially in a vertical position.
  • the blasting agent system according to the invention is introduced into the pipe 9 so that it is leaned closely against the wall of the pipe 9 with pairs of wheel units 10 'and the radially flexible shield 8.
  • the loosening pipe 19 also begins to rotate, which with a series of loosening teeth 20 swirls and loosens the abrasive located in the reservoir.
  • the rotation of the rotor 18 causes a pressure drop in the delivery pipe 3, as a result of which the abrasive is sucked into the delivery pipe and further into the rotor 18 (arrow E) and then is thrown radially outward onto the wall of the pipe 9 by means of its blades (arrow G) .
  • the abrasive collects in the storage tank 4 and the dust particles are blown through by means of an air stream the fine grid 7 pressed through.
  • the blasting agent system according to the invention is pushed along the tube 9 until the entire inner surface is irradiated.
  • FIG. 3 Another embodiment of the blasting agent system for blasting the inner surfaces according to the invention consists of a turbine-like centrifugal device 16 known per se, which has a stator 17 and e.g. has a pneumatically or electrically driven rotor 18 (not detailed in FIG. 3).
  • the rotor 18 Viewed in the axial direction, the rotor 18 is assigned a non-rotatable tube 23, which with its opposite end penetrates the bottom of the storage vessel 4 and forms a fixed connection with the bottom.
  • the storage vessel 4 is assigned an essentially radially flexible fine grid 7, which is permeable only to the dust particles formed during the irradiation.
  • the aforementioned fine grid 7 is associated in the axial direction with the funnel-shaped shield 8, which is made of elastic material and is also radially flexible, and which, when the system according to the invention is in operation, rests closely against the inner surface of the tube 9 to be irradiated.
  • a rotatable elevator tube 24 is arranged coaxially with the tube 23, which is formed on its inner surface with a worm 25 and is fixedly connected to the rotor 18.
  • the elevator tube 24 extends longitudinally essentially to the area of the bottom of the storage vessel 4, a distance being provided between the latter and the free end of the elevator tube 24, which enables the blasting agent to pass freely.
  • the storage vessel 4 is formed on the side of its base facing away from the free end of the elevator tube 3 and the stator 17 is formed on its side facing away from the suction side of the device 16 with a pair of radial ribs 26, each of which has the wheel unit 10 ′ described above. carry.
  • the inner surface of the tube 9 is irradiated essentially in a vertical position.
  • the blasting agent system according to the invention is introduced into the tube 9 so that it is leaned closely against the wall of the tube 9 with pairs of wheel units 10 'and the radially flexible shield 8.
  • the elevator tube 24 also begins to rotate with the screw conveyor 25, which conveys the blasting medium located in the storage vessel 4 into the turbine device 16 (arrow H).
  • Rotation of the rotor 18 causes the blasting medium to be thrown radially outward onto the wall of the tube 9 by means of its blades (arrow J).
  • the abrasive collects in the storage tank 4 and the dust particles are removed by means of Air flow pressed through the fine grid 7.
  • the blasting agent system according to the invention is pushed along the tube 9 until the entire inner surface is irradiated.
  • the system according to the invention can e.g. to irradiate a flat outer surface.
  • both the centrifugal turbine 16 or the centrifugal diffuser 1 and the storage boiler 4 are arranged in a correspondingly designed housing 27.
  • this has a correspondingly designed outlet opening 28 for the blasting agent, which is encased with a suitable protective shield 30 adapted to the treated surface 29.
  • the protective shield 30 adapts precisely to the treated surface, so that the blasting agent is prevented from escaping into the environment.
  • the lower part of the protective shield 30 is designed in a slide-like manner so that the blasting agent slides back into the storage vessel 4 through it.
  • the blasting agent is fed from the area of the bottom of the storage vessel 4 into the centrifugal turbine 16 or the diffuser 1 through the relatively short delivery pipe 3, whereby one of the delivery types described above can be used for this.
  • the operation of the system for irradiating the outer surface corresponds to the operation according to the exemplary embodiments described above, so that it is not necessary to repeat what has already been described.
  • the dust produced during the irradiation is collected by means of a suction / dedusting device which is not known and is known per se and which must form a negative pressure in the treated tube 9 or housing 27 in order to prevent dust from entering the surroundings.
  • the storage tank 4 can also be designed as a cyclone separator in all examples.
  • the blasting agent system according to the invention can be successfully used for blasting the inner surfaces, in particular pipes, as described above with reference to the exemplary embodiments.
  • system according to the invention with constructional measures that do not exceed the scope and essence of the invention, also in other areas, such as, for example, irradiation of the outer surfaces of the pipes or workpieces of different profiles, flat workpieces, such as ship flanks, etc ., is applicable.
  • the energy consumption in the abrasive system according to the invention is surprisingly significantly reduced (even three to four times). At the same time, this also means a substantial reduction in the irradiation costs per m 2 of the irradiated surface, the cost savings with respect to the system according to the prior art being up to 95%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Nozzles (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Warping, Beaming, Or Leasing (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Screw Conveyors (AREA)

Abstract

The invention relates to an abrasive plant which is characterised in that the first longitudinal inlet end of the injector-type centrifugal diffuser (1) is assigned a connection stub (2) and the second longitudinal inlet end is assigned a conveying tube (3). The free end of the conveying tube (3) is closed off by means of a basket-type supply tank (4), the outer wall of which diverges in the direction of the diffuser (1). In the region of the connection to the base of the supply tank (4), the conveying tube (3) is fitted with a number of radial cutouts (5), the inner sides of the connection stub (2) and of the conveying tube (3) being connected to one another by a connecting blow-in tube (6). This projects essentially into the conveying tube (3) through the base of the supply tank (4). Lying opposite on the outer surface of the connection stub (2) and in the region of the free end thereof there is arranged a pair of ribs (10) on which in each case one guide wheel unit (10') is arranged. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Strahlmittelanlage für die Oberflächenbehandlung mit Hilfe eines Strahlmittels. Genauer, der Gegenstand gemäss der Erfindung fällt in das Gebiet der Oberflächenbehandlung durch schleifendes oder ähnliches Abstrahlen mit teilchenförmigem Werkstoff.The present invention relates to an abrasive system for surface treatment using an abrasive. More specifically, the object according to the invention falls in the field of surface treatment by grinding or similar blasting with particulate material.

Eine Strahlmittelanlage, z.B. zum Bestrahlen der Innenflächen von Rohren, ist aus US 3,824,738 bekannt geworden. Bei dieser Anlage werden während des Strahlverfahrens das Strahlmittel und das vom Rohr abgestrahlte Material von einem freien Ende des Rohres mittels Luftstrom abgesaugt, der durch ein drehendes Rad erzeugt wird. Die Anlage weist einen aus einem bzw. in ein Rohr aus- und einfahrbaren Wagen, ein Schleuderrad, das an einem rohrförmigen Gehäuse drehbar gelagert ist, welch letzteres am vorderen Teil des Wagens angeordnet ist, eine Förderschnecke zur Strahlmittelzufuhr an das Schleuderrad und eine hinter dem Schleuderrad angeordnete Ummantelung, um den nutzbaren Rohrquerschnitt zu redezieren. Das drehbare Schleuderrad ist ins freie Rohrende eingesetzt und erzeugt während seiner Bewegung durch das Rohr einen Luftstrom, der das Strahlmittel und das vom Rohr abgestrahlte Material durch das gegenüberliegende freie Rohrende austreibt. Das Strahlmittel wird danach vom Material, das von einem Rohr abgestrahlt wurde, getrennt und an anderen Rohren angewendet.An abrasive system, e.g. for irradiating the inner surfaces of pipes has become known from US 3,824,738. In this system, the blasting medium and the material blasted from the tube are sucked off from a free end of the tube by means of air flow generated by a rotating wheel during the blasting process. The system has a carriage which can be extended and retracted into or out of a tube, a centrifugal wheel which is rotatably mounted on a tubular housing, the latter being arranged on the front part of the carriage, a screw conveyor for supplying abrasive to the centrifugal wheel and one behind the Casing arranged on the centrifugal wheel in order to reduce the usable pipe cross section. The rotating centrifugal wheel is inserted into the free tube end and, as it moves through the tube, creates an air flow that drives out the abrasive and the material blasted from the tube through the opposite free tube end. The abrasive is then separated from the material that was blasted from one pipe and applied to other pipes.

Ein Nachteil der genannten Anlage liegt darin, dass sie bei einem Strahlverfahren der Rohre, deren Länge üblicherweise zwischen 6 und 12 m beträgt, eine in Draufsicht verhältnismässig grosse Fläche einnimmt. Die Länge der Anlage ist nämlich mindestens gleich zweimal der Rohrlänge, d.h. der Länge des Rohres und der des Dornes, an welchem der Wagen befestigt ist, was verhältnismässig grosse Räume zum Anordnen derartiger Anlagen beansprucht.A disadvantage of the system mentioned is that when the pipes are blasted, the length of which is usually between 6 and 12 m, it takes up a relatively large area in plan view. The length of the system is namely at least twice the pipe length, i.e. the length of the tube and that of the mandrel to which the carriage is attached, which takes up relatively large spaces for arranging such systems.

Ein weiterer Nachteil der bekannten Anlage liegt darin, dass die Länge der Förderleitung, durch die das Strahlmittel vom Rohraustritt bis zum Vorratskessel wieder zurückgeführt wird, verhältnismässig gross ist und sogar drei- bis viermal der Länge des bestrahlten Rohres umfasst. Demzufolge sind die Einzelbauteile dieser Förderleitung einem grossen Verschleiss durch das Strahlmittel ausgesetzt, wodurch ihre Lebensdauer wesentlich verkürzt wird.Another disadvantage of the known system is that the length of the delivery line, through which the abrasive is returned from the pipe outlet to the storage boiler, is relatively large and even three to four times the length of the irradiated pipe. As a result, the individual components are these Delivery line is exposed to a large amount of wear from the abrasive, which significantly shortens its life.

Eine Strahlmittelanlage gemäss dem Oberbegriff des Anspruchs 1 ist aus der DE-B-11 42 298 bekannt. Diese Anlage weist als Schleudervorrichtung eine Schleuderturbine auf, wobei ein Strahlmittel mittels der Schleudervorrichtung an eine Oberfläche eines Werkstücks geschleudert wird, ein Strahlmittel-Vorratskessel mit gleicher Längsachse wie die Schleudervorrichtung angeordnet ist und im Bereich unmittelbar unter der Schleudervorrichtung liegt, und das Strahlmittel vom Vorratskessel in die Schleudervorrichtung mittels einer Fördervorrichtung gefördert wird.A blasting agent system according to the preamble of claim 1 is known from DE-B-11 42 298. This system has a centrifugal turbine as a centrifugal device, an abrasive being thrown onto a surface of a workpiece by means of the centrifugal device, an abrasive storage tank having the same longitudinal axis as the centrifugal device and being in the area immediately below the centrifugal device, and the abrasive from the storage tank in the centrifugal device is conveyed by means of a conveying device.

Aufgabe der Erfindung ist es, die bekannte Strahlmittelanlage so weiterzubilden, daß eine einfache und effektive Strahlmittelrückführung möglich ist.The object of the invention is to develop the known abrasive system so that a simple and effective return of abrasive is possible.

Diese Aufgabe wird durch eine Strahlmittelanlage gemäss Anspruch 1 gelöst. Bevorzugte Ausführungsformen sind in den abhängigen Ansprüchen angegeben.This object is achieved by an abrasive system according to claim 1. Preferred embodiments are specified in the dependent claims.

Bei der erfindungsgemässen Strahlmittelanlage ist ein Strahlmittel-Vorratskessel mit gleicher Längsachse wie eine Schleuderturbine oder ein Schleuderdiffusor angeordnet und liegt im Bereich unmittelbar darunter. Das Strahlmittel wird vom Vorratskessel entweder in die Turbine oder den Diffusor durch ein verhältnismässig kurzes Förderrohr geführt, das die Turbine bzw. den Diffusor mit dem Vorratskessel verbindet. Das Strahlmittel wird durch das genannte Rohr auf verschiedene Weise gefördert; z.B. mittels eines Förderluftstroms der durch den Saugeffekt der Turbine bzw. des Diffusors erzeugt und/oder durch ein Binde-Einblaserohr eingeführt wird, oder mittels einer Förderschnecke, die in dem genannten Förderrohr angeordnet ist.In the blasting agent system according to the invention, a blasting agent storage vessel with the same longitudinal axis as a centrifugal turbine or a centrifugal diffuser is arranged and lies in the area immediately below. The blasting agent is fed from the storage boiler either into the turbine or the diffuser through a relatively short delivery pipe which connects the turbine or the diffuser to the storage boiler. The abrasive is conveyed through the tube in various ways; e.g. by means of a conveying air flow which is generated by the suction effect of the turbine or the diffuser and / or is introduced through a binding blow-in tube, or by means of a screw conveyor which is arranged in the said conveying tube.

Ein Ausführungsbeispiel der erfindungsgemässen Strahlmittelanlage weist einen Injektorschleuderdiffusor auf, welchem an erstem Längs-Eintrittsende ein Rohrstutzen und an zweitem Längs-Eintrittsende ein Förderrohr zugeordnet ist. Das freie Ende des letzteren ist mittels eines korbartigen Vorratskessels abgeschlossen, wobei das Förderrohr im Bereich der Verbindung mit dem Boden des Vorratskessels mit einer Reihe von Radialaussparungen ausgestattet ist. Die Innenseiten des Rohrstutzens und des Förderrohres sind miteinander durch ein Binde- Einblaserohr verbunden, welches im wesentlichen in das Förderrohr durch den Boden des Vorratskessels hineinragt.An embodiment of the blasting agent system according to the invention has an injector centrifugal diffuser, to which a pipe socket is assigned at the first longitudinal entry end and a delivery pipe at the second longitudinal entry end. The free end of the latter is closed off by means of a basket-like storage kettle, the delivery pipe being equipped with a series of radial cutouts in the region of the connection to the bottom of the storage kettle. The inner sides of the pipe socket and the delivery pipe are connected to one another by a binding blow-in pipe which essentially projects into the delivery pipe through the bottom of the storage tank.

Ein weiteres Ausführungsbeispiel der erfindungsgemässen Strahlmittelanlage weist eine turbinenartige Schleudervorrichtung auf, die aus einem Stator und einem pneumatisch oder elektrisch angetriebenen Rotor besteht, welchem in Axialrichtung das drehfeste Förderrohr zugeordnet ist. Das letztere ist im Bereich seines freien Endes mit einer Reihe von Radialaussparungen ausgebildet. Das Förderrohr ist mit seinem einen Ende an eine Saugseite der turbinenartigen Schleudervorrichtung und mit seinem anderen, d.h. dem freien Ende, an den Boden des korbartigen Vorratskessels angeschlossen. Koaxial mit dem Förderrohr und eine Spielpassung bildend ist ein mit dem Rotor feststehend verbundenes, drehbares Lockerungsrohr angeordnet, das an seinem freien Ende, im Bereich der Aussparungen am Förderrohr, stirnseitig mit einer Reihe von gleichmässig beabstandeten Lockerungszähnen ausgebildet ist.Another exemplary embodiment of the abrasive system according to the invention has a turbine-like centrifugal device which consists of a stator and a pneumatically or electrically driven rotor, to which the rotationally fixed delivery pipe is assigned in the axial direction. The latter is formed with a series of radial recesses in the area of its free end. The conveyor tube is connected at one end to a suction side of the turbine-like centrifugal device and at its other end, ie the free end, to the bottom of the basket-like storage vessel. Coaxial with the feed pipe and forming a clearance fit, there is a rotatable loosening pipe which is fixedly connected to the rotor and is formed at its free end, in the area of the recesses on the feed pipe, with a row of evenly spaced loosening teeth at the end.

Gemäß einem weiteren Ausführungsbeispiel der erfindungsgemässe Anlage ist dem Rotor in Axialrichtung ein drehfestes Rohr zugeordnet ist, das mit seinem gegenüberliegenden Ende den Boden des Vorratskessels durchdringt und mit dem Boden eine feste Verbindung bildet. Koaxial mit dem genannten Rohr ist ein drehbares Elevatorrohr angeordnet, das an seiner Innenfläche mit einer Schnecke versehen ist. Das Elevatorrohr ist fest mit dem Rotor verbunden und erstreckt sich in Längsrichtung im wesentlichen bis zum Boden des Vorratskessels, wobei zwischen dem letzteren und dem freien Ende des Rohres ein Abstand vorgesehen ist.According to a further exemplary embodiment of the system according to the invention, the rotor is assigned an axially non-rotatable tube which, with its opposite end, penetrates the bottom of the storage vessel and forms a firm connection with the bottom. A rotatable elevator tube is arranged coaxially with said tube and is provided with a screw on its inner surface. The elevator tube is fixedly connected to the rotor and extends in the longitudinal direction essentially to the bottom of the storage vessel, a distance being provided between the latter and the free end of the tube.

Die erfindungsgemässe Anlage kann z.B. zum Bestrahlen der ebenen Aussenfläche benutzt werden, wobei bei diesem Ausführungsbeispiel sowohl die Schleuderturbine bzw. der Diffusor als auch der Vorratskessel in einem Gehäuse angeordnet sind. Dieses weist im Bereich der Schleuderturbine bzw. des Diffusors eine entsprechend ausgebildete Austrittsöffnung für das Strahlmittel auf, die mit einem zweckmässigen, der behandelten Oberfläche eingepassten Schutzschild ummantelt ist. Das Strahlmittel wird vom Bereich des Bodens des Vorratskessels in die Schleuderturbine bzw. den Diffusor durch ein verhältnissmässig kurzes Förderrohr zugeführt, wobei dazu eine der vorstehend beschriebenen Förderarten verwendet werden kann.The system according to the invention can e.g. be used to irradiate the flat outer surface, in this embodiment both the centrifugal turbine or the diffuser and the reservoir are arranged in a housing. In the area of the centrifugal turbine or the diffuser, this has a correspondingly designed outlet opening for the blasting agent, which is encased with a suitable protective shield that fits the treated surface. The blasting agent is fed from the area of the bottom of the storage vessel into the centrifugal turbine or the diffuser through a relatively short delivery pipe, one of the delivery types described above being able to be used for this.

Gemäß einem weiteren Ausführungsbeispiel der Strahlmittelanlage ist derjenige Teil der Mantelwandung des korbartigen Vorratskessels, der in Axialrichtung der Schleudervorrichtung näher liegt, im wesentlichen als ein radial nachgiebiges Feingitter ausgebildet, welchem weiter in Axialrichtung ein aus elastischem Stoff ausgebildeter und radial nachgiebiger trichterförmiger Schild zugeordnet ist. Nach einer weiteren Ausführungsform kann der genannte Strahlmittel-Vorratskessel auch als ein Zyklonabscheider ausgebildet sein.According to a further exemplary embodiment of the blasting agent system, that part of the jacket wall of the basket-like storage vessel which is closer to the centrifugal device in the axial direction is essentially designed as a radially flexible fine grid, to which a funnel-shaped shield made of elastic material and radially flexible is assigned in the axial direction. According to a further embodiment, the abrasive storage tank mentioned can also be designed as a cyclone separator.

Die Ausführungsbeispiele der Anlage gemäss der Erfindung werden anhand beigefügter Zeichnungen beschrieben. Darin zeigen:

Fig.1
eine Ausführungsform der Anlage gemäss der Erfindung zum Bestrahlen der Innenflächen, insbesondere von Rohren, in Längsschnitt,
Fig. 2
ein weitere Ausführungsform der Anlage aus Fig. 1 in Längsschnitt,
Fig. 3
noch eine weitere Ausführungsform der Anlage aus Fig. 1 in Längsschnitt,
Fig. 4
eine Ausführungsform der Anlage gemäss der Erfindung zum Bestrahlen der ebenen Aussenfläche, in Längsschnitt.
The embodiments of the system according to the invention are described with reference to the accompanying drawings. In it show:
Fig. 1
1 shows an embodiment of the system according to the invention for irradiating the inner surfaces, in particular pipes, in longitudinal section,
Fig. 2
1 shows a further embodiment of the system from FIG. 1 in longitudinal section,
Fig. 3
still another embodiment of the system from FIG. 1 in longitudinal section,
Fig. 4
an embodiment of the system according to the invention for irradiating the flat outer surface, in longitudinal section.

Eine Strahlmittelanlage gemäss der Erfindung ist als eine Anlage zum Bestrahlen der Innenflächen von Rohren dargestellt. Eine solche Anlage zum Bestrahlen der Innenflächen von Rohren kann aber auch als eine Anlage zum Bestrahlen von ebenen Aussenflächen entweder von Rohren oder Werkstücken verschiedener Profile, flächiger Werkstücke, wie z.B. Schiffsflanken usw., verwendet werden.A blasting agent system according to the invention is shown as a system for blasting the inner surfaces of pipes. Such a system for irradiating the inner surfaces of pipes can also be used as a system for irradiating flat outer surfaces either of pipes or workpieces of different profiles, flat workpieces, such as e.g. Ship flanks, etc. can be used.

Eine Strahlmittelanlage zum z.B. Bestrahlen der Innenflächen von Rohren besteht aus einem Injektorschleuderdiffusor 1, welchem an seinem ersten Längsende, gegebenenfalls dem oberen, ein Rohrstutzen 2 zugeordnet ist. Dessen freies Ende dient der Aufnahme eines an sich bekannten und in der Zeichnung nicht dargestellten flexiblen Zufuhrschlauchs von unter Druck stehender Antriebsluft. Dem anderen Längs-Eintrittsende des Injektordiffusors 1, gegebenenfalls dem unteren, ist ein Förderrohr 3 zugeordnet, dessen freies Ende mit einem Strahlmittel-Vorratskessel 4 derart abgeschlossen wird, dass das Förderrohr 3 zentrisch am Boden des Vorratskessels 4 dessen Mantelwand in Richtung gegen den Diffusor 1 divergiert, angeordnet ist. Das Förderrohr 3 ist im Bereich der Verbindung mit dem Boden des Vorratskessels 4 mit einer Reihe von Radialaussparungen 5 ausgestattet, die zum Eintritt des Strahlmittels dienen. Das Innere des Rohrstutzens 2 und das des Förderrohrs 3 sind mittels eines Binde-Einblaserohres 6 verbunden, wobei das letztere an den Rohrstutzen 2 im Bereich des oberen Endes des Injektordiffusors 1 angeschlossen ist und durch den Boden des Vorratskessels 4 in das Förderrohr 3 hineinragt.An abrasive system for e.g. Irradiation of the inner surfaces of pipes consists of an injector centrifugal diffuser 1, which is assigned a pipe socket 2 at its first longitudinal end, possibly the upper one. Its free end serves to receive a flexible supply hose of pressurized drive air, which is known per se and is not shown in the drawing. The other longitudinal entry end of the injector diffuser 1, possibly the lower one, is assigned a delivery pipe 3, the free end of which is closed off with a blasting agent supply vessel 4 in such a way that the delivery pipe 3 is centered on the bottom of the supply vessel 4 and its jacket wall in the direction toward the diffuser 1 diverges, is arranged. In the area of the connection to the bottom of the storage vessel 4, the delivery pipe 3 is equipped with a series of radial cutouts 5 which serve for the entry of the blasting agent. The inside of the pipe socket 2 and that of the delivery pipe 3 are connected by means of a binding blow-in pipe 6, the latter being connected to the pipe connection 2 in the region of the upper end of the injector diffuser 1 and protruding through the bottom of the storage vessel 4 into the delivery pipe 3.

Der Mantelwandteil des korbartigen Vorratskessels 4, der in der Nähe des Injektordiffusors 1 liegt, ist in Achsrichtung gesehen im wesentlichen als ein radial nachgiebiges Feingitter 7 ausgebildet, das nur für die beim Bestrahlen enstandenen Staubpartikeln durchlässig ist. Weiterhin ist dem genannten Feingitter 7 in Axialrichtung ein aus elastischem Stoff ausgebildeter und ebenso radial nachgiebiger trichterförmiger Schild 8 zugeordnet, der beim Betrieb der Anlage gemäss der Erfindung dicht an die Innenfläche des zu bestrahlenden Rohres 9 aufliegt.The jacket wall part of the basket-like storage vessel 4, which is located in the vicinity of the injector diffuser 1, is essentially seen in the axial direction as a radially flexible fine grid 7, which is only permeable to the dust particles formed during the irradiation. Furthermore, the said fine grid 7 is in the axial direction made of elastic material and also radially flexible funnel-shaped shield 8 is assigned, which lies close to the inner surface of the tube 9 to be irradiated during operation of the system according to the invention.

Gegenüberliegend an die Aussenfläche des Rohrstutzens 2 und im Bereich von dessen freiem Ende ist ein Paar Rippen 10 angeordnet, an denen jeweils eine Führungsradeinheit 10' angeordnet ist. Diese weist einen an sich bekannten, in Radialrichtung des Rohres 9 drehbar gelagerten und federgestützten Hebel 11 auf, an dessen freiem Ende ein Stützrad 12 drehbar gelagert ist. Der jeweilige Hebel 11 ist radial mittels einer stabförmigen Führung 13 geführt, die drehbar an der jeweiligen Rippe 10 gelagert, wobei eine Druckfeder 14 angesteckt ist, die zwischen dem jeweiligen Hebel 11 und der Rippe 10 angeordnet ist. Weiterhin ist an der von Radialaussparungen 5 des Förderrohrs 3 abgewandten Seite des Bodens des Vorratskessels 4 ein Befestigungsvorsprung 15 angeordnet, der ein Paar gegenüberliegende Rippen 10 aufweist, an denen die vorstehend beschriebene Radeinheit 10' jeweils angeordnet ist.Opposite to the outer surface of the pipe socket 2 and in the region of its free end, a pair of ribs 10 is arranged, on each of which a guide wheel unit 10 'is arranged. This has a known, spring-supported lever 11 which is rotatably mounted in the radial direction of the tube 9 and on the free end of which a support wheel 12 is rotatably mounted. The respective lever 11 is guided radially by means of a rod-shaped guide 13, which is rotatably mounted on the respective rib 10, a compression spring 14 being attached, which is arranged between the respective lever 11 and the rib 10. Furthermore, a fastening projection 15 is arranged on the side of the bottom of the storage vessel 4 facing away from radial recesses 5 of the delivery pipe 3, said fastening projection having a pair of opposing ribs 10, on which the wheel unit 10 ′ described above is arranged.

Die Innenfläche des Rohres 9 wird entweder in einer horizontalen oder vertikalen Lage bestrahlt, u.zw. derart, dass die betreffende Anlage gemäss der Erfindung ins Rohr 9 hineingeschoben wird, wobei sie mit Paaren von Radeinheiten 10' und dem radial nachgiebigen Schild 8 dicht an der Wand des Rohres 9 angelehnt ist. Durch eine näher nicht dargestellte Zufuhrleitung wird dem Rohrstutzen 2 der Druckluftstrom (Pfeil A) zugeführt, der teilweise über das Binde-Einblaserohr 6 durch den Boden des Vorratskessels 4 fliesst (Pfeil B). Dieser, der sogenannte Primärdruckluftstrom, saugt dabei das Strahlmittel durch die Radialaussparungen 5 des Förderrohrs 3 an und schiebt es durch letzteres aufwärts. Dazu trägt auch der Sekundärdruckluftstrom bei, d.h. der Druckluftstrom, der nach Ableiten des Primärdruckluftstroms über das Binde-Einblaserohr 6 im Rohrstutzen 2 bleibt. Der Sekundärdruckluftstrom fliesst dabei durch den Diffusor 1 (Pfeil C), wobei er einen Überdruck im Vorratskessel 4 bildet, welcher, wie bereits erwähnt, das Strahlmittel zusätzlich durch die Aussparungen 5 schiebt (Pfeil D). Der Sekundärdruckluftstrom, der durch den Diffusor 1 fliesst, erzeugt auch einen Unterdruck im Förderrohr 3, was die Strömung des Strahlmittels, welches durch den schnellen Druckluftstrom radial gegen die Innenfläche des Rohres 9 geschleudert ist (Pfeil E), zusätzlich beschleunigt. Das Strahlmittel fällt danach in den Vorratskessel 4 und die Staubpartikeln werden mittels des Druckluftstromes durch Das Feingitter 7 hindurchgeschoben. Die Strahlmittelanlage gemäss der Erfindung wird längs des Rohres 9 weiter geschoben, bis die ganze Innenfläche bestrahlt ist.The inner surface of the tube 9 is irradiated in either a horizontal or vertical position, etc. such that the system in question is pushed into the tube 9 according to the invention, being leaned closely against the wall of the tube 9 with pairs of wheel units 10 'and the radially flexible shield 8. The compressed air flow (arrow A) is supplied to the pipe socket 2 through a supply line (not shown in more detail), which partially flows through the bottom of the storage boiler 4 via the binding blow-in pipe 6 (arrow B). This, the so-called primary compressed air flow, sucks the blasting medium through the radial recesses 5 of the delivery pipe 3 and pushes it upwards through the latter. The secondary compressed air flow also contributes to this, ie the compressed air flow that remains in the pipe socket 2 after the primary compressed air flow has been discharged via the binding blow-in pipe 6. The secondary compressed air flow flows through the diffuser 1 (arrow C), forming an overpressure in the storage vessel 4, which, as already mentioned, pushes the blasting agent additionally through the cutouts 5 (arrow D). The secondary compressed air flow that flows through the diffuser 1 also creates a negative pressure in the delivery pipe 3, which additionally accelerates the flow of the blasting agent, which is thrown radially against the inner surface of the pipe 9 by the rapid compressed air flow (arrow E). The blasting agent then falls into the storage vessel 4 and the dust particles are pushed through the fine grid 7 by means of the compressed air flow. The blasting agent system according to the invention is pushed along the tube 9 until the entire inner surface is irradiated.

Ein weiteres Ausführungsbeispiel der Anlage gemäss der Erfindung weist eine an sich bekannte turbinenartige Schleudervorrichtung 16 auf, die aus einem Stator 17 und einem pneumatisch angetriebenen Rotor 18 besteht (in Fig. 2 nicht ausführlich dargestellt). Dem Rotor 18 ist, in Axialrichtung gesehen, das drehfeste Förderrohr 3 zugeordnet, das ebenso wie beim ersten Ausführungsbeispiel im Bereich seines freien Endes mit einer Reihe von Radialaussparungen 5 ausgebildet und das mit seinem ersten Ende an die Saugseite der Turbinenvorrichtung 16 angeschlossen ist. Das andere, d.h. das freie Ende, des Rohres 3 ist an dem Boden des korbartigen Vorratskessels 4 befestigt, welchem ebenso wie beim ersten Ausführungsbeispiel das im wesentlichen radial nachgiebige Feingitter 7 zugeordnet ist, das nur für die beim Bestrahlen entstandenen Staubpartikeln durchlässig ist. Weiterhin ist dem genannten Feingitter 7 in Axialrichtung der aus elastischem Stoff ausgebildete und ebenso radial nachgiebige trichterförmige Schild 8 zugeordnet, der beim Betrieb der Anlage gemäss der Erfindung dicht an die Innenfläche des zu bestrahlenden Rohres 9 aufliegt.Another exemplary embodiment of the system according to the invention has a turbine-like centrifugal device 16 known per se, which consists of a stator 17 and a pneumatically driven rotor 18 (not shown in detail in FIG. 2). Viewed in the axial direction, the rotor 18 is assigned the rotationally fixed delivery pipe 3, which, like in the first exemplary embodiment, is formed with a series of radial recesses 5 in the region of its free end and is connected with its first end to the suction side of the turbine device 16. The other, i.e. the free end of the tube 3 is attached to the bottom of the basket-like storage vessel 4, which, as in the first exemplary embodiment, is associated with the essentially radially flexible fine grid 7, which is permeable only to the dust particles formed during irradiation. Furthermore, the aforementioned fine grid 7 is associated in the axial direction with the funnel-shaped shield 8, which is made of elastic material and is also radially flexible, and which, when the system according to the invention is in operation, rests closely against the inner surface of the tube 9 to be irradiated.

Koaxial mit dem Förderrohr 3 und eine Spielpassung bildend ist auch ein mit dem Rotor 18 feststehend verbundenes, drehbares Lockerungsrohr 19 angeordnet. An seinem freien Ende, d.h. im Bereich der Aussparungen 5 am Förderrohr 3, ist das Lockerungsrohr 19 stirnseitig mit einer Reihe von gleichmässig beabstandeten Lockerungszähnen 20 ausgebildet. Der Vorratskessel 4 ist an der von den Radialaussparungen 5 des Förderrohrs 3 abgewandten Seite seines Bodens und der Stator 17 an seiner von der Saugseite der Vorrichtung 16 abgewandten Seite jeweils mit einem Vorsprung 21, 21' ausgebildet, der ein Paar von radialen Rippen 22 aufweist, an denen die vorstehend beschriebene Radeinheit 10' jeweils angeordnet ist.A rotatable loosening pipe 19, which is fixedly connected to the rotor 18, is also arranged coaxially with the delivery pipe 3 and forming a clearance fit. At its free end, i.e. In the area of the recesses 5 on the conveyor tube 3, the loosening tube 19 is formed on the end face with a row of evenly spaced loosening teeth 20. The storage vessel 4 is formed on the side of its bottom facing away from the radial recesses 5 of the delivery pipe 3 and the stator 17 on its side facing away from the suction side of the device 16 each with a projection 21, 21 ′ which has a pair of radial ribs 22, on which the wheel unit 10 'described above is arranged.

Auch bei diesem zweiten Ausführungsbeispiel wird die Innenfläche des Rohres 9 im wesentlichen in einer vertikalen Lage bestrahlt. Die Strahlmittelanlage gemäss der Erfindung wird in das Rohr 9 eingebracht, so dass sie mit Paaren von Radeinheiten 10' und dem radial nachgiebigen Schild 8 dicht an der Wand des Rohres 9 angelehnt ist Gleichzeitig mit dem Rotor 18 der Turbinenvorrichtung 16 fängt auch das Lockerungsrohr 19 an sich zu drehen, das mit einer Reihe von Lockerungszähnen 20 das im Vorratskessel befindliche Strahlmittel wirbelt und lockert. Das Drehen des Rotors 18 bewirkt dabei einen Druckabfall im Förderrohr 3, wodurch das Strahlmittel in das Förderrohr und weiter in den Rotor 18 angesaugt (Pfeil E) und danach mittels dessen Schaufeln radial nach aussen an die Wand des Rohres 9 geworfen wird (Pfeil G). Das Strahlmittel sammelt sich im Vorratskessel 4 und die Staubpartikeln werden mittels Luftstrom durch das Feingitter 7 hindurchgepresst. Die Strahlmittelanlage gemäss der Erfindung wird längs des Rohres 9 weiter geschoben, bis die ganze Innenfläche bestrahlt ist.In this second exemplary embodiment too, the inner surface of the tube 9 is irradiated essentially in a vertical position. The blasting agent system according to the invention is introduced into the pipe 9 so that it is leaned closely against the wall of the pipe 9 with pairs of wheel units 10 'and the radially flexible shield 8. At the same time as the rotor 18 of the turbine device 16, the loosening pipe 19 also begins to rotate, which with a series of loosening teeth 20 swirls and loosens the abrasive located in the reservoir. The rotation of the rotor 18 causes a pressure drop in the delivery pipe 3, as a result of which the abrasive is sucked into the delivery pipe and further into the rotor 18 (arrow E) and then is thrown radially outward onto the wall of the pipe 9 by means of its blades (arrow G) . The abrasive collects in the storage tank 4 and the dust particles are blown through by means of an air stream the fine grid 7 pressed through. The blasting agent system according to the invention is pushed along the tube 9 until the entire inner surface is irradiated.

Ein weiteres Ausführungsbeispiel der Strahlmittelanlage zum Bestrahlen der Innenflächen gemäss der Erfindung besteht aus einer an sich bekannten turbinenartigen Schleudervorrichtung 16, die einen Stator 17 und z.B. einen pneumatisch oder elektrisch angetriebenen Rotor 18 aufweist (in Fig. 3 nicht detailliert). Dem Rotor 18 ist in Axialrichtung gesehen ein drehfestes Rohr 23 zugeordnet, das mit seinem gegenüberliegenden Ende den Boden des Vorratskessels 4 durchdringt und mit dem Boden eine feste Verbindung bildet. Dem Vorratskessel 4 ist in gleicher weise wie bei den vorstehend beschriebenen Ausführungsbeispielen ein im wesentlichen radial nachgiebiges Feingitter 7 zugeordnet, das nur für die beim Bestrahlen entstandenen Staubpartikeln durchlässig ist. Weiterhin ist dem genannten Feingitter 7 in Axialrichtung der aus elastischem Stoff ausgebildete und ebenso radial nachgiebige trichterförmige Schild 8 zugeordnet, der beim Betrieb der Anlage gemäss der Erfindung dicht an die Innenfläche des zu bestrahlenden Rohres 9 aufliegt. Koaxial mit dem Rohr 23 ist ein drehbares Elevatorrohr 24 angeordnet, das an seiner Innenfläche mit einer Schnecke 25 ausgebildet und fest mit dem Rotor 18 verbunden ist. Das Elevatorrohr 24 erstreckt sich längsweise im wesentlichen bis zum Bereich des Bodens des Vorratskessels 4, wobei zwischen letzterem und dem freien Ende des Elevatorrohres 24 jeweils ein Abstand vorgesehen ist, der einen freien Durchgang des Strahlmittels ermöglicht.Another embodiment of the blasting agent system for blasting the inner surfaces according to the invention consists of a turbine-like centrifugal device 16 known per se, which has a stator 17 and e.g. has a pneumatically or electrically driven rotor 18 (not detailed in FIG. 3). Viewed in the axial direction, the rotor 18 is assigned a non-rotatable tube 23, which with its opposite end penetrates the bottom of the storage vessel 4 and forms a fixed connection with the bottom. In the same way as in the exemplary embodiments described above, the storage vessel 4 is assigned an essentially radially flexible fine grid 7, which is permeable only to the dust particles formed during the irradiation. Furthermore, the aforementioned fine grid 7 is associated in the axial direction with the funnel-shaped shield 8, which is made of elastic material and is also radially flexible, and which, when the system according to the invention is in operation, rests closely against the inner surface of the tube 9 to be irradiated. A rotatable elevator tube 24 is arranged coaxially with the tube 23, which is formed on its inner surface with a worm 25 and is fixedly connected to the rotor 18. The elevator tube 24 extends longitudinally essentially to the area of the bottom of the storage vessel 4, a distance being provided between the latter and the free end of the elevator tube 24, which enables the blasting agent to pass freely.

Der Vorratskessel 4 ist an der von dem freien Ende des Elevatorrohrs 3 abgewandten Seite seines Bodens und der Stator 17 ist an seiner von der Saugseite der Vorrichtung 16 abgewandten Seite jeweils mit einem Paar von radialen Rippen 26 ausgebildet, die jeweils die vorstehend beschriebene Radeinheit 10' tragen.The storage vessel 4 is formed on the side of its base facing away from the free end of the elevator tube 3 and the stator 17 is formed on its side facing away from the suction side of the device 16 with a pair of radial ribs 26, each of which has the wheel unit 10 ′ described above. carry.

Wie bei den beiden vorstehend beschriebenen Ausführungsbeispielen wird die Innenfläche des Rohres 9 im wesentlichen in einer vertikalen Lage bestrahlt. Die Strahlmittelanlage gemäss der Erfindung wird in das Rohr 9 eingebracht, so dass sie mit Paaren von Radeinheiten 10' und dem radial nachgiebigen Schild 8 dicht an die Wand des Rohres 9 angelehnt ist. Gleichzeitig mit dem Rotor 18 der Turbinenvorrichtung 16 fängt auch das Elevatorrohr 24 mit der Förderschnecke 25, die das im Vorratskessel 4 befindliche Strahlmittel in die Turbinenvorrichtung 16 fördert (Pfeil H), an sich zu drehen. Das Drehen des Rotors 18 bewirkt, dass das Strahlmittel mittels dessen Schaufeln radial nach aussen an die Wand des Rohres 9 geworfen wird (Pfeil J). Das Strahlmittel sammelt sich im Vorratskessel 4 und die Staubpartikeln werden mittels Luftstrom durch dar Feingitter 7 hindurchgepresst. Die Strahlmittelanlage gemäss der Erfindung wird längs des Rohres 9 weiter geschoben, bis die ganze Innenfläche bestrahlt ist.As in the two exemplary embodiments described above, the inner surface of the tube 9 is irradiated essentially in a vertical position. The blasting agent system according to the invention is introduced into the tube 9 so that it is leaned closely against the wall of the tube 9 with pairs of wheel units 10 'and the radially flexible shield 8. Simultaneously with the rotor 18 of the turbine device 16, the elevator tube 24 also begins to rotate with the screw conveyor 25, which conveys the blasting medium located in the storage vessel 4 into the turbine device 16 (arrow H). Rotation of the rotor 18 causes the blasting medium to be thrown radially outward onto the wall of the tube 9 by means of its blades (arrow J). The abrasive collects in the storage tank 4 and the dust particles are removed by means of Air flow pressed through the fine grid 7. The blasting agent system according to the invention is pushed along the tube 9 until the entire inner surface is irradiated.

Die erfindungsgemässe Anlage kann, z.B. zum Bestrahlen einer ebenen Aussenfläche, angepasst werden. Bei diesem Ausführungsbeispiel sind sowohl die Schleuderturbine 16 bzw. der Schleuderdiffusor 1 als auch der Vorratskessel 4 in einem entsprechend ausgeführten Gehäuse 27 angeordnet. Dieses weist im Bereich der Schleuderturbine 16 bzw. des Diffusors 1 eine entsprechend ausgebildete Austrittsöffnung 28 für das Strahlmittel auf, die mit einem zweckmässigen, der behandelten Oberfläche 29 angepassten Schutzschild 30 ummantelt ist. Der Schutzschild 30 passt sich der behandelten Oberfläche genau an, so dass der Austritt des Strahlmittels in die Umgebung verhindert wird. Das untere Teil des Schutzschildes 30 ist rutschenartig ausgebildet, damit das Strahlmittel durch diesen wieder in den Vorratskessel 4 zurück rutscht. Das Strahlmittel wird vom Bereich des Bodens des Vorratskessels 4 in die Schleuderturbine 16 bzw. den Diffusor 1 durch das verhältnismässig kurze Förderrohr 3 zugeführt, wobei dazu eine von vorstehend beschriebenen Förderarten angewendet werden kann.The system according to the invention can e.g. to irradiate a flat outer surface. In this exemplary embodiment, both the centrifugal turbine 16 or the centrifugal diffuser 1 and the storage boiler 4 are arranged in a correspondingly designed housing 27. In the area of the centrifugal turbine 16 or the diffuser 1, this has a correspondingly designed outlet opening 28 for the blasting agent, which is encased with a suitable protective shield 30 adapted to the treated surface 29. The protective shield 30 adapts precisely to the treated surface, so that the blasting agent is prevented from escaping into the environment. The lower part of the protective shield 30 is designed in a slide-like manner so that the blasting agent slides back into the storage vessel 4 through it. The blasting agent is fed from the area of the bottom of the storage vessel 4 into the centrifugal turbine 16 or the diffuser 1 through the relatively short delivery pipe 3, whereby one of the delivery types described above can be used for this.

Der Betrieb der Anlage zum Bestrahlen der Aussenfläche entspricht dem Betrieb nach den vorstehend beschriebenen Ausführungsbeispielen, demzufolge ist eine Wiederholung der bereits Beschriebenen überflüssig.The operation of the system for irradiating the outer surface corresponds to the operation according to the exemplary embodiments described above, so that it is not necessary to repeat what has already been described.

Bei allen Ausführungsbeispielen wird der beim Bestrahlen entstandene Staub mittels einer nicht dargestellten, an sich bekannten Absaug-/Entstaubungseinrichtung, die im behandelten Rohr 9 oder Gehäuse 27 einen Unterdruck bilden muss, um Stauben in die Umgebung zu verhindern, gesammelt. Der Vorratskessel 4 kann ebenso bei allen Beispielen auch als ein Zyklonabscheider ausgebildet sein.In all of the exemplary embodiments, the dust produced during the irradiation is collected by means of a suction / dedusting device which is not known and is known per se and which must form a negative pressure in the treated tube 9 or housing 27 in order to prevent dust from entering the surroundings. The storage tank 4 can also be designed as a cyclone separator in all examples.

Die Strahlmittelanlage gemäss der Erfindung kann erfolgreich zum Bestrahlen der Innenflächen, insbesondere Rohre, genutzt werden wie oben unter Bezugnahme auf die Ausführungsbeispiele beschrieben wurde. Es ist aber selbstverständlich, dass die Anlage gemäss der Erfindung mit konstruktionstechnischen Massnahmen, die den Umfang und das Wesen der Erfindung nicht überschreiten, auch an anderen Gebieten, wie z.B. Bestrahlen der Aussenflächen der Rohre oder Werkstücke verschiedener Profile, flächiger Werkstücke, wie z.B. Schiffsflanken usw., anwendbar ist.The blasting agent system according to the invention can be successfully used for blasting the inner surfaces, in particular pipes, as described above with reference to the exemplary embodiments. However, it goes without saying that the system according to the invention with constructional measures that do not exceed the scope and essence of the invention, also in other areas, such as, for example, irradiation of the outer surfaces of the pipes or workpieces of different profiles, flat workpieces, such as ship flanks, etc ., is applicable.

Der Energieverbrauch bei der Strahlmittelanlage gemäss der Erfindung wird überraschend wesentlich herabgesetzt (auch drei- bis viermal). Das bedeutet gleichzeitig auch eine wesentliche Herabsetzung der Bestrahlungskosten pro m2 der bestrahlten Oberfläche, wobei die Kostenersparnis im Hinblick auf die Anlage gemäss dem Stand der Technik bis zu 95% beträgt.The energy consumption in the abrasive system according to the invention is surprisingly significantly reduced (even three to four times). At the same time, this also means a substantial reduction in the irradiation costs per m 2 of the irradiated surface, the cost savings with respect to the system according to the prior art being up to 95%.

Claims (11)

  1. An abrasive blasting apparatus, comprising an abrading device (1; 16) consisting either of a turbine abrading device (16) or an abrading diffuser (1) for throwing abrasive material to the surface of a workpiece, a storage tank (4) of the abrasive material arranged in the same longitudinal axis as the abrading device and lying in the area directly under same, and a conveying device (3; 23, 24, 25) for dispersing abrasive material from the storage tank into the abrading device, characterized in that the apparatus is provided for treatment of vertically placed surfaces, that abrasive material, after being rebounded from the surface, is conveyed back to a storage tank (4) due to the influence of gravity, and that abrasive material is from the storage tank (4) conveyed into an abrading device (1; 16) by means of a relatively short conduit (3; 23) connecting the abrading device with the storage tank.
  2. An abrasive blasting device according to claim 1, characterized in that the storage tank (4) is shaped as a bucket.
  3. An abrasive blasting device according to claim 1 or 2, characterized in that the portion of a mantle wall of the bucket-shaped storage tank (4) lying closer to the abrading device (1; 16) in respect to the axial direction is essentially formed as a radially flexible fine sieve (7) with which is in axial direction associated a radially flexible funnel-shaped shield (8) made of elastic material.
  4. An abrasive blasting device according to claim 1, characterized in that both the abrading device (1; 16) and the storage tank (4) are arranged in a housing (27) and that in the area of the abrading device there is provided an outlet opening (28) for abrasive material, said outlet opening being enclosed with a protective shield (30).
  5. An abrasive blasting device according to claim 4, characterized in that the lower portion of the protective shield (30) is shaped as a chute in order to convey abrasive material back to the storage tank (4).
  6. An abrasive blasting device according to any claims 1 to 5, characterized in that abrasive material is blasted by means of a turbine and diffuser, respectively, against the surface of a workpiece and that abrasive material is conveyed through the conduit (3) by means of an air jet generated by suction effect of the turbine (16) and the diffuser (1), respectively, and/or supplied through a connection-injection pipe (6), or by means of a screw conveyer (24, 25) arranged in the conduit (3).
  7. An abrasive blasting device according to claim 6, characterized in that the first inlet end of the injection blasting diffuser (1) is associated with a socket (2) and the second inlet end of said diffuser is associated with the conduit (3) the free end thereof closed by means of the bucket-shaped storage tank (4), in the area of connection to a bottom of the storage tank (4) said conduit (3) comprising a set of radial recesses (5), the socket (2) and the conduit (3) being mutually interconnected by means of the connection-injection pipe (6) projecting into conduit (3) below the bottom of the storage tank (4), on the bottom of the storage tank (4) and on the socket (2) there being arranged a pair of ribs (10) comprising a guide wheel unit (10') in each case.
  8. An abrasive blasting device according to claim 6, characterized in that the blasting turbine (16) comprises a rotor (18) and a stator (17), the rotor (18) being in axial direction associated with a rotational rigid conduit (3) the free end thereof closed by means of the bucket-shaped storage tank (4), in the area of connection to the bottom of the storage tank (4) said conduit (3) comprising a set of radial recesses (5), coaxially with the conduit (3) and with a clearance fit arranged a rotatable loosening tube (19) rigidly linked with the rotor (18), at its free end, in the area of the radial recesses (5) on the conduit (3), said tube being face-formed with a set of equally spaced loosening teeth (20), on the bottom of the storage tank (4) and on the stator (17) there being arranged a pair of radial ribs (22) comprising a guide wheel unit (10') in each case.
  9. An abrasive blasting device according to claim 6, characterized in that the blasting turbine (16) comprises a rotor (18) and a stator (17), the rotor (18) being in axial direction associated with a rotational rigid conduit (23) which with the opposite end thereof pierces the bottom of the storage tank (4), forming a rigid connection with said bottom, coaxially with the conduit (23) arranged a rotatable elevator tube (24) provided with a screw conveyer (25) on the inner surface of its wall and rigidly associated with the rotor (18), said elevator tube extending in axial direction essentially to the area of the bottom of the storage tank (4), between the latter and the free end of the elevator tube (24) there being provided a spacing, and on the bottom of the storage tank (4) and on the stator (17) arranged a pair of radial ribs (26) comprising a guide wheel unit (10') in each case.
  10. An abrasive blasting device according to one of claims 7 to 9, characterized in that the guide wheel unit (10') comprises a resilient supported lever (1) pivoted in radial direction, at the free end thereof there being rotatably located a supporting wheel (12), each lever (11) being radially guided by means of a rod-shaped guideway (13) pivoted on each rib (10, 22, 26), a compression spring (14) slipped onto said guideway.
  11. An abrasive blasting device according to one of claims 1 to 10, characterized in that the storage tank (4) is formed as a cyclone separator.
EP93108884A 1992-06-19 1993-06-02 Abrasive plant Expired - Lifetime EP0574771B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SI9200122 1992-06-19
SI9200122A SI9200122A (en) 1992-06-19 1992-06-19 An apparatus for inside sanding, particulary the tubes
SI9300204A SI9300204A1 (en) 1993-04-19 1993-04-19 Blasting device
SI9300204 1993-04-19

Publications (2)

Publication Number Publication Date
EP0574771A1 EP0574771A1 (en) 1993-12-22
EP0574771B1 true EP0574771B1 (en) 1997-04-23

Family

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Application Number Title Priority Date Filing Date
EP93108884A Expired - Lifetime EP0574771B1 (en) 1992-06-19 1993-06-02 Abrasive plant

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US (1) US5573450A (en)
EP (1) EP0574771B1 (en)
JP (1) JPH0639720A (en)
AT (1) ATE152024T1 (en)
DE (1) DE59306235D1 (en)
DK (1) DK0574771T3 (en)
ES (1) ES2103400T3 (en)

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GB9717451D0 (en) * 1997-08-19 1997-10-22 Mansfield Philip A Apparatus for treatment of surfaces
US6739956B2 (en) * 2001-10-30 2004-05-25 Valiant Corporation Apparatus for cleaning engine block passages
JP5066430B2 (en) * 2007-11-20 2012-11-07 日本発條株式会社 Reflective member for shot peening and shot peening method using the same
US8402637B2 (en) * 2008-11-04 2013-03-26 Chief Automotive Technologies, Inc. Vehicle fixture with alignment target
US9095949B2 (en) * 2011-04-20 2015-08-04 Ennio Menegon Sharpening device for cutting blade
GB2533092A (en) * 2014-12-08 2016-06-15 Pipeline Induction Heat Ltd A machine for cleaning a section of pipeline
JP6547226B2 (en) * 2015-09-01 2019-07-24 ウラカミ合同会社 Centrifugal rotary type particle storage tank and particle projection apparatus to inner surface of pipe
CN109129209A (en) * 2018-09-19 2019-01-04 四川西南环保科技防腐股份有限公司 Ball blast vehicle for pipeline internal joint patch
RU192650U1 (en) * 2019-03-29 2019-09-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Саратовский государственный технический университет имени Гагарина Ю.А." (СГТУ имени Гагарина Ю.А.) DEVICE FOR CLEANING INTERNAL SURFACES OF PIPES
CN112975763B (en) * 2021-04-24 2022-07-08 杭州泓林科技有限公司 Running mechanism and running method of steel pipe inner wall deruster and eccentric wheel and running frame thereof

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DE1142298B (en) * 1960-04-08 1963-01-10 Licentia Gmbh Device for sandblasting the inner surface of pipes
US4563841A (en) * 1984-06-22 1986-01-14 Resource Engineering & Manufacturing Company Internal grit blast weld joint cleaner
IN166218B (en) * 1984-11-09 1990-03-31 Framatome & Cie
US4753050A (en) * 1986-06-02 1988-06-28 Penn Lehigh Crane Systems, Inc. Apparatus for cleaning and peening ingot molds
DE3634700A1 (en) * 1986-10-11 1988-04-14 Ulrich Ebinger Device for the sandblasting of small surface regions
GB2205259A (en) * 1987-06-04 1988-12-07 Shaun Waddingham Shot blasting machinery
US4984396A (en) * 1988-08-29 1991-01-15 Uragami Fukashi Cleaning device
JP3028148B2 (en) * 1991-05-24 2000-04-04 不可止 浦上 Centrifugal projection device

Also Published As

Publication number Publication date
JPH0639720A (en) 1994-02-15
EP0574771A1 (en) 1993-12-22
ES2103400T3 (en) 1997-09-16
ATE152024T1 (en) 1997-05-15
US5573450A (en) 1996-11-12
DK0574771T3 (en) 1997-10-27
DE59306235D1 (en) 1997-05-28

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