DE2323714A1 - PORTABLE BLASTER - Google Patents

Description

DR. ING. E. HOFFMANN · DIPL. ING. W. EITLE · DK. RER. NAT. K. HOFFMANN

PATENT LAWYERS D-8000 MÖNCHEN 81ARABELLASTRASSE 4 TELEPHONE (0811) 911087

23237H

Sintokogio, Ltd., Nagoya / Japan

Portable blasting device

The invention relates to a portable blasting device which is used for cleaning the surface of large workpieces is suitable, e.g. of prefabricated components that are assembled into the hull of a ship.

An air blasting device that removes abrasive materials, e.g. granules or sand, together with compressed air in a jet, is generally known to clean the Surface of large workpieces used, e.g. for

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prefabricated components that make up a hull of a ship be assembled. However, this conventional air jet device is disadvantageous in that it is effective due to its inherent limitation of the area to be treated is quite small, and the finished surface is far from uniform because it is difficult to get the abrasive materials uniformly in Blow towards the workpiece surface.

A centrifugal jet type blasting machine as generally known in the art can use the Clean the surface of such a workpiece in a large area in one operation. Because with such a device for the supply and recovery of the abrasive material, however, complex and large-volume facilities are necessary it is impossible to reduce the overall size of the device to the point where the operator can clean the Surface while holding the device by hand if these facilities are included in the device. Therefore, the centrifugal jet type blasting apparatus is disadvantageous in that it is impossible to use for cleaning where it is moved along the surface of a large workpiece.

The invention is based on the object of creating a portable blasting device that is light in weight, is small and can be easily carried by hand by an operator.

According to the invention, this object is achieved with a blasting device solved, which has a combination of the following features:

a) a chamber with an opening and a seal Rubber or synthetic resins or the like, which

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is arranged around the opening so that through the opening abrasive material blasted towards the surface of a workpiece within the chamber is included;

b) a centrifugal jet device attached to the chamber and provided with an impeller which is anti'eibbar by a compressed air motor to the Material fed to the fan impeller to impart a centrifugal effect and it is used to clean the surface to shine the same;

c) a container for the material connected to the interior of the chamber, so that the material can after completion of the Grinding and cleaning the surface, whereby it was blasted against the workpiece surface and can be collected in the container together with the dust generated during processing;

d) a dust collector with an opening for discharging the deposited dust by the same and an air injection device for directing compressed air in the direction the opening, whereby a negative pressure can be generated within the dust separator, so that the pneumatic into the Dust collector conveyed material and the dust can be separated from each other and the separated dust can be ejected through the opening;

e) a dust collector connected to the dust collector for collecting the dust supplied through the opening of the dust collector;

f) a device for feeding the material including an inlet part connected to the container

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for feeding the material and the dust to the dust separator., and an injection nozzle, which is located in the Container extends so that pressurized air is directed towards the inlet part, with the nozzle in operation can be set to apply compressed air to the material and dust contained within the container, so that they flow through the inlet part at high speed, thereby pneumatically entering the dust collector are fundable.

This avoids the described and other disadvantages of the known devices. With the present invention a new and improved blasting device is thus proposed which is light in weight and small, so that it can be easily carried by hand by an operator. In the device, compressed air is used to all Means, including the means for driving a centrifugal jet device, to drive which through Centrifugal action blows abrasive material onto the surface of a workpiece, as well as a device for guiding it of the abrasive material contained in a container to a dust collector and a device for separating the Dust from the abrasive material.

Furthermore, the present invention provides a portable beam device of the type described above, in which a guide means is disposed within the chamber to guide the recovered from the surface of the workpiece Direct material back towards the surface so that the abrasive material repeatedly hits the workpiece surface can impact to effectively clean the workpiece surface over a wide area.

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In addition, the present invention provides a portable blasting device of the type described above, in which a connecting line for connecting the interior of the chamber with the interior of the dust collector is provided so that "floating in the chamber, fine Dust particles can be sucked into the dust collector.

In addition, the present invention provides a portable beam device of the type described above, in which a deflector within the dust collector for deflecting the abrasive supplied to the dust collector Material is arranged, whereby the dust is effectively separated from the abrasive material.

Finally, the invention provides a portable blasting device of the type described above, which is remarkable is light and easy to handle and can be manufactured at a low cost because the impeller for Blowing out the abrasive material is made from a rotating sheet metal, several blades integral with it the sheet metal and a manifold serve the dual purpose of securing the rotating sheet metal on the shaft a compressed air motor and the change of the flow direction of the abrasive material is used.

Advantageously, the invention provides a portable blasting device which works with an improved surface cleaning effect because the abrasive material can be repeatedly brought to impinge on the surface of a workpiece.

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In addition, the invention provides a portable blasting device in which fine dust particles that are inside a chamber that can be sucked into a dust collector, where it is separated from the abrasive material by using a negative pressure established in the dust collector.

Finally, the invention provides a portable blasting device created in which the abrasive material and the dust of the mixture, which is promoted by it in the stream of compressed air is enclosed, can be effectively separated from each other.

In addition, the invention provides a portable blasting device having an impeller that is remarkable is light in weight and can be easily handled and manufactured at a low cost.

These and other objects, features, and advantages of the invention are from the following detailed description of a preferred embodiment with reference to FIG Drawing clear. Show it:

Fig. 1 is a partially sectioned rear view showing the general arrangement of the components of a AusfUhrungsbeispiels represents a portable beam device according to the invention,

Pig. 2 shows a section along the line AA of the Pig. I,

Fig. 3 is a partially sectioned plan view of a dust collector,

4 shows a longitudinal section of a handle,

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5 shows a section of a centrifugal jet device, Fig. 6 is a section along the line B-B of Fig. 5,

7 shows an enlarged perspective illustration, which shows the relationship between a rotating plate and the blades of a fan wheel,

8 is an enlarged perspective view of one form of manifold, and FIG

9 is an enlarged perspective illustration of a other form of distributor.

In the drawing, an embodiment of a portable beam device according to the invention is shown. One of a A centrifugal jet device driven by an air motor 2 is attached to the rear of a chamber 1. The centrifugal jet device 3 consists of a fan wheel 5 * which is attached to the output shaft 4 of the compressed air motor 2, so that it rotates together with it, and a capsule 7 which is attached to a housing 6 of the centrifugal jet device is attached so that it ends at one end near the central portion of the impeller 5. Chamber 1 is provided on the front with an opening 8 through which an abrasive material, e.g. granules or sand, can the surface of a workpiece 40 can be straightened. The opening δ is arranged in a plane that is related to an angle of more or less on the jet direction of the material conveyed by the centrifugal jet device J5 than 90 occupies. So are the back and the front of the chamber are not parallel to one another, as best seen in FIG. A seal 9 made of one material such as rubber or synthetic resin is attached to the circumference of the opening δ by means of a fastening part 10, so that the

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Abrasive material blown out by the centrifugal jet device is enclosed within the chamber 1. One Guide 11 is borrowed from the lower portion of the rear of the chamber 1 by means of a fastening part 12 in the v / es attached in parallel with respect to the plane with the opening S.

A container 15 is arranged for briefly holding the abrasive material at the lower end of the chamber 1, so that the interior of the container is in communication with the interior of the chamber. An injection nozzle 14 for compressed air extends into the container 1 ~ 3, and an entry part 15 is connected to the side wall of the container 15 at a position opposite to the injection nozzle Ik . A tubular member 16 has one end connected to the other end of the capsule 7 in the centrifugal jet 3 for feeding the abrasive material into the capsule 7, and this tubular member 16 has its other end connected to the lower end of a dust collector 17.

The entry part 15, which with its one end to the side wall of the container I3 is connected to its other End connected to an upper lateral portion of the dust collector 17 via a line Iu. One with one End of line 20 connected to a dust collector 19 is at its other end at another upper side Section of the dust collector I7 at one point opposite connected to the connection of the line 1δ on the dust collector. The dust collector I9 has a simple structure, wherein only one sack container is arranged within a housing.

A deflector 21 is at an upper central portion inclined in relation to the inside of the dust separator I7 arranged to the vertical to the abrasive, on it

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to deflect incident material. So is the upper space within of the dust separator 17 divided by the deflector 21 into a left and a right space section, which connected in the lower room. An injection line 22 for compressed air extends into the dust collector 17 to direct compressed air in the direction of the connection of the line 20 on the dust collector. A suction line 23 is with one end on the upper portion of the dust collector 17 and the other end on a suitable portion of the chamber 1 connected.

A hollow handle 26 with a hand-operated one disposed therein Valve 25 is fastened to a suitable section of the chamber 1 with a fastening device 24. A Lever 27 is hinged at one end to the handle 26 so that according to its actuation or its depression a valve stem 29 can be pressed in the corresponding direction against the force of a spring 2 &, whereby a valve opening 30 is opened, as can be seen in FIG. That The lower end of the handle 26 is connected by a rubber hose 50 to a compressed air source (not shown). A cross connector 51 is on the upper portion of the handle 26 then connected to the valve 25, and the three branch connections of the cross connection 31 are connected to the air motor 2, the injection nozzle 14 in the container 13 and the injection line 22 connected in the dust separator 17 by corresponding supply lines 32, 33 and 34, which hoses from Can be rubber or plastic.

A plurality of locking members 36 are made of non-magnetic material attached to the outer periphery of the chamber 1 by means of brackets 35 and extend towards the surface of the Workpiece 40, so that it is with its front end in a position a little separated from the front end of the seal

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end up. A permanent magnet 37 is carried by each of the locking members 36, as in Pig. 2 can be seen.

A supply line 3 & can be between the compressed air motor 2 and connected to the injection nozzle 14, so that the exiting air from the compressed air motor 2 is also used to convey the abrasive material can be used. Furthermore, a suitable belt 39 can be attached to the chamber 1 so that the portable blasting device can be conveniently suspended from the operator's shoulder.

The structure of the fan wheel 5 is explained in more detail with reference to FIGS. Several blades 42 are integral formed with a flat metal sheet 41 by the end portions of the flat metal sheet 41 substantially at right angles to the plane thereof, as best seen in FIG. The metal sheet 41 is with a central axial bore 43 is provided. A cutout 46 is formed in the bore 43, so that one at a later still to be described distributor provided pin 45 in the cutout 46 can be recorded. The output shaft 4 of the compressed air motor 2 extends through the housing 6 the centrifugal jet device 3 in the interior thereof. The front end section 47 of the output shaft 4 is externally threaded Mistake. The manifold 44 is provided with a plurality of radial projections 48, and one threaded axial Bore extends through the manifold like a nut, as shown in FIG. The one with an external thread Front end section 47 of the output shaft 4 extends through the central axial bore 43 of the metal sheet with the blades 42 made in one piece, and the nut-like distributor with the projections 48 is on the externally threaded front end portion 47 of the output shaft 4 screwed on to form the impeller 5.

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The rietallclech kl karm can also be attached to the output shaft 4 by means of a rail; Threaded axial bore provided in the output shaft 4 and a screw-like shaped distributor 44, as shown in Fig. 9 int, is screwed into the axial bore of the output shaft 4. The portable beam apparatus of the present invention operates as follows, as best seen with reference to Pig. 1 can be seen. A large amount of abrasive material, for example granules or sand, is contained in the container 13. The operator grasps the handle 2.6 and the compressed air motor 2 with his hands and moves the entire device in order to press the front end of the locking members 36 against the surface of a workpiece 40. Thus, the leading end portion of the seal is brought into sealing engagement with the surface of the workpiece, flexing it slightly inwardly to confine the abrasive material within the chamber. Furthermore, because the device is held in physical contact with the workpiece 40 by the action of the permanent magnets 37, the force of the operator to hold the device against the workpiece is essentially negligible. The operator then presses the lever 27 of the handle 26. Corresponding to the depression of the lever 27, compressed air is supplied to the compressed air motor 2, to the injection nozzle 14 in the container 15 and to the injection line 22 in the dust separator I7 by means of the corresponding lines J2, 3J and 34. The compressed air directed from the injection nozzle 14 into the container IJ drives the abrasive material out of the container IJ into the inlet part 15, where the abrasive material is accelerated in order to be conveyed via the line 18 into the dust separator I7.

The abrasive material conveyed into the dust collector I7 impacts the deflector, is thereby decelerated and falls due to gravity down, so that it through

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the tubular part 16 is guided into the capsule 7. In the In the meantime, brings the one supplied to the air motor 2 Compressed air, the fan wheel, which is fixedly attached to the output shaft 4 of the compressed air motor 2, is set to a high speed. So the capsule 7 is supplied in the manner described above abrasive material is now directed in the direction of the blades 42 by the action of the projections on the manifold 44 and from the opening of the capsule 7 by the centrifugal force exerted by the blades 42 in the direction of the surface of the workpiece 40 blown. After the blown abrasive material hits the surface of the workpiece 40, it becomes thrown back so that it strikes against the guide 11, thereby being thrown back again against the sections of the workpiece to ground that have not yet been cleaned. This type of impact of the abrasive material against the surface of workpiece 40 is repeated to cover a large area effectively cleaning the workpiece surface, and then gravity causes the abrasive material to fall down into the Container IJ, where it is collected again.

Due to the cleaning of the surface becomes considerable Dust is generated, and the greater part of the dust collects in the container 13 along with the abrasive material. The fine ones Dust particles, which are very light and float in the chamber, are fed directly through a suction into the dust separator 17., which is generated by the suction line 23, as later will be described later.

On the other hand, that is collected in the container 13 abrasive material passed together with the dust into the dust separator 17 and falls in the manner described above below. The pressure inside the dust collector 17 is due to the fact that the compressed air is connected in the direction of the Line 20 is directed, which with the dust collector

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19 is connected, a little negative. So the light, in the dust collector 17 together with the abrasive material introduced dust is separated from the abrasive material without it falling down, because it is in the direction of the dust collector is entrained by the negative pressure applied by the line 20. Also, the fine Dust particles floating in the chamber 1, sucked through the line 23 into the dust separator 17, because the light Vacuum is always maintained within the dust collector 17.

While the type of operation described above is carried out continuously, the operator who is using the handle 26 and the air motor 2 holds the device in the state in which it is pressed against the surface of the workpiece 40 is kept moving \ from one position to the other in order to be continuous to clean the surface of the workpiece 40.

From the foregoing description it is clear that the present Invention provides a portable blasting device that is very small and light and easily carried by the operator can be because only compressed air is required to operate its working components. Furthermore, this is Providing the guide 11 for the material in the chamber advantageous because the abrasive material repeatedly against the Surface of the workpiece 40 impacts and thereby effectively cleans the surface of the workpiece over a wide area. About that In addition, the provision of the connecting suction line 23 between the dust separator 17 and the chamber 1 is advantageous, because fine dust particles floating in the chamber 1 can be efficiently collected. In addition, the arrangement the deflector 21 in the dust collector 17 is advantageous because the dust is effectively removed from the abrasive material can be separated. An additional benefit is that

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that the impeller 5 is light and cheap and easily replaced or can be repaired because it is in the form of an integral unit composed of the metal sheet 41 and the Blades 42 is made.

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Claims (6)

■ 23237U Claims ΓΙ Γ) Portable blasting device, marked by combining the following features: a) a chamber (1) with an opening (8) and a seal (9) made of rubber or synthetic resins or the like, which is arranged around the opening so that through the Opening in the direction of the surface of a workpiece (40) blasted abrasive material enclosed within the chamber is; b) a centrifugal jet device (j5) attached to the chamber attached and provided with a fan wheel (5) which can be driven by a compressed air motor (2) to the to impart a centrifugal effect to the material fed to the fan wheel and to use it to clean the surface to shine on it; c) a container (15) for the material connected to the interior of the chamber, so that the material can be removed after completion of grinding and cleaning the surface with it being blasted against the workpiece surface and can be caught in the container together with the dust that was generated during processing; d) a dust separator (17) with an opening for ejection of the separated dust through the same and an Lufteinblaseinriehtung (22) for directing compressed air in Direction of the opening, whereby a negative pressure can be generated inside the dust separator, so that the pneumatic Material and dust conveyed into the dust collector can be separated from each other and the separated dust can be ejected through the opening; - 16 309847/0493 e) a dust collector connected to the dust collector (19) for collecting the dust supplied through the opening of the dust collector; f) a device for supplying the material including an inlet part (15) connected to the container (13) for supplying the material and the dust to the dust collector, and an injection nozzle (3Λ), which extends into the container so that pressurized air is directed towards the entry part, the nozzle is operable to supply compressed air to the material and dust contained within the container give up so that they flow through the entry part at high speed, thereby making them pneumatic can be conveyed into the dust separator. 2. Portable blasting device according to claim 1, characterized characterized in that a guide device (11) is arranged within the chamber (1) so that the on the surface blasted and recovered from the same material can be guided again in the direction of the same, whereby the material after completion of cleaning a portion of the surface for cleaning another portion thereof is reusable. 3 · Portable blasting device according to claim 1, characterized characterized in that a connecting line (23) connects the chamber (1) with the dust separator (17), so that the vacuum produced in the dust separator is applied to the interior can be communicated to the chamber, as a result of which part of the dust floating within the chamber is sucked into the dust separator can be. - 17 - 309847/0493 23237U 4. Portable blasting device according to claim 1, characterized geke-nnzeich that a deflection device (21) within the dust separator (17) for deflection and deflecting in the direction of the centrifugal jet device (3) the pneumatically from the container (1; 5) into the Dust separator (17) conveyed material is provided, whereby the material is prevented from being through the Opening of the dust separator (17) into the dust collector (19) is ejected. 5 · Portable blasting device according to claim 1, characterized in that the fan wheel (5) consists of a rotatable plate (41) arranged within a housing (6) of the centrifugal jet device (j5) and rotatable coaxially with the air motor (2), a plurality of blades (42) on the opposite edges of the Sheet metal are provided and by substantially at right angles with respect to the plane of the sheet bent portions of the same are formed, whereby centrifugal force can be imparted to the material fed there and the same at high speed can be directed in the direction of the surface, and that the sheet metal through a distributor (44) on the shaft (4) of the air motor (2) and rotates with the sheet metal, which determines the direction of the flow of the in the Centrifugal jet device guided material is changeable, so that the material is directed in the direction of the blades is. 6. Portable blasting device according to claim 1, characterized in that a handle (26) attached to the chamber (1) and gripped by an operator, so that the blasting device by the operator while grinding and cleaning the surface is portable that the handle with a valve 18 309847/0493 23237U (25) is provided, which is provided with a compressed air source is connected to supply compressed air through the same that a lever (27) for pushing the valve in the open Position is provided when the handle is detected by the operator, and that a three-way junction (31) with the Valve is connected, whereby the flow of compressed air is branched in three directions when the valve is in the open position is pressed, wherein a first connecting line (32) the first branch connection of the three-way junction a second connecting line (33) connects the second branch connection of the three-way junction with the compressed air motor (2) in order to supply the compressed air to drive the motor connects to the injection nozzle (14) for 'supplying compressed air to the injection nozzle, and a third connecting line (34) the third branch of the three-way junction with the air injection device (22) for supplying compressed air connects to the air injection device. 309847/0 U 93 Blank page