EP1930122B1 - Blasting device with throwing wheel - Google Patents

Description

The present invention relates to a blasting apparatus having a blast wheel, the blast wheel having a base disc connectable to a drive shaft and a plurality of spinner blades detachably connected to the base disc, the base disc having a receptacle per spinner blade, each spinner disc having a receptacle fitting into the receptacle Has foot part and wherein a single common locking means is provided for releasably fixing all the centrifugal blades.

Jet devices and associated blast wheels have long been known from practical use. There are two basic designs of centrifugal wheels, namely those with two base disks, between which the centrifugal blades are arranged, and those with a single base disk on which the centrifugal blades are mounted on one side. The latter embodiment is preferred today because it facilitates the assembly and disassembly of the spinner blades, which constitute a wearing part in the blasting device. In addition, there is an increasing desire to simplify the assembly and disassembly of the centrifugal blades further by the fact that the centrifugal blades are no longer individually and separately connected to the base disk, but that all centrifugal blades of the impeller are fixed to the base disk with a single common locking means.

A blast wheel of the type mentioned is out EP 0 688 633 A1 known. This document shows a blast wheel with a base disc and one-sided salaried centrifugal blades. The base disk has in its top radial, not seen in cross-section grooves undercut. Radially outward, the grooves have each seen in the radial direction an undercut bevel. With this slope acts each a counter-slope on a blade root together when the blade is inserted into the associated groove in the base disk. Radially inside the blade foot protrudes radially inward over the remaining centrifugal blade. Near the radially inner end of the grooves, an annular groove runs in the base disk. After inserting the foot part of all blades in their grooves in the base disk, an O-ring is inserted into the annular groove. Then, a central impeller is attached to the bottom plate by means of a flange fixing the footpieces of the blades at the radially inner end thereof.

The attachment of the centrifugal blades works here only if the base disk is in a substantially horizontal position and with the grooves facing up. In a position of the base disk in an inclined or vertical plane or even with the grooves down, the blades do not have sufficient support before attaching the impeller with the fixing flange and at least partially fall out of the grooves. Thus, this known blast wheel is subject during the assembly of the centrifugal blades of a restriction to the effect that a certain position of the base disk for the assembly of the centrifugal blades must be complied with. This location can be taken in many cases only when the base plate is removed from an associated jet device, if within the jet device, the base disk in its assembled state does not occupy a suitable orientation for the assembly of the centrifugal blades. This results in a high disassembly and assembly costs, which should be avoided in itself with the single common locking means for fixing all centrifugal blades.

Other comparable spinners are out DE-PS 24 07 247 and DE-PS 23 63 507 known. These documents show consistently blast wheels with centrifugal blades, the foot parts are used in the axial direction in recordings in a base disk substantially. Radially outward, the receptacles each have a radially inwardly facing, oblique nose, which engages in a matching, oblique recess radially outward on the foot part. To assemble the centrifugal bucket, the recess at the radially outer end of the foot part is firstly used in engagement with the nose in the groove, wherein the blade is moved in an oblique position axially towards the base disk and then radially outwards. Then, the radially inner end of the blade is moved axially toward the base disk. After all blades are inserted, finally, a backup of the blades takes place with a central mounting flange, which covers a radially inner end portion of the foot parts of all blades and clamped against the base disk.

Even with these known spinning wheels, there is the problem that for the assembly of the centrifugal blades, the base disk a favorable, preferably horizontal alignment with upwardly facing grooves must take, so that the centrifugal blades their position relative to Maintaining the washer after they have been inserted in the mounts and before the central mounting flange is attached.

The patent US 5,209,024 shows a blast wheel with base disk, centrifugal blades and a cover plate comprising an impeller. The base plate has in its upper side a circumferentially continuous, bowl-shaped recess, which is surrounded radially on the outside by an axially projecting edge web. This edge web has seen in the circumferential direction on a single opening. The cover disc forming part of the impeller has radially outwardly open grooves through which the centrifugal blades protrude, and is axially braced against the base disc. In the clamped condition, leg pieces of the blades, which are wider than the blades themselves, are clamped between the base disk and the cover disk.

For the assembly and disassembly of the centrifugal blades two different approaches are described in this document:

In the first approach, the cover plate is only loosened relative to the base plate, but not removed. The cover disk with the blades is gradually rotated relative to the base disk so that in each case one blade can be pulled out radially through the opening in the edge web of the base disk or pushed radially inward. After inserting or exchanging all blades, the cover disk is again braced against the base disk.

In the second procedure, the cover plate is completely separated from the base disk and removed. The shovels are secured provisionally after their insertion into the grooves of the cover plate by means of a circumferential large clamp. Thereafter, the preassembled unit of cover and spinner blades is positioned on the base disk and by clamping the cover plate against the base disk, the blades are finally fixed.

In the first procedure, the blades are provisionally secured in position by the still loosely connected base disk and cover disk. However, the assembly and disassembly is very cumbersome. In the second described procedure, all blades are provisionally secured by a common connection means, namely the clamp. However, this second approach assumes that the cover plate is removed from the associated jet device and brought into a horizontal position, since only so the centrifugal blades relative to the cover plate can be arranged and aligned so that the clamp can be attached from provisional connecting means. Thus, the handling is cumbersome and time-consuming in the second approach.

Finally, from the Scriptures WO 90/09 871 a blast wheel for a blasting device, in which also all the spinner blades are simultaneously fixed by means of a central, annular flange on the supporting base disk. In this case, the central annular flange is clamped by means of a screw against the centrifugal blades and the base disk and against a shaft carrying the centrifugal wheel. On each centrifugal blade, a hook-shaped extension is formed on the underside in addition to a central, radially inwardly pointing nose, radially on the outside. This extension engages from the outside in the radial direction inward into a corresponding recess on the outer circumference of the supporting base disk. With this construction, it may be possible to provide limited provisional support of the spinner blade until the central flange is attached, but this function requires some friction between the cooperating parts of the base disc and the spinner blades, otherwise at least one base disk arranged in a vertical plane downward pointing centrifugal blades would fall off the base disk. More importantly, the desired provisional mounting effect does not arise if the base disk faces downwards with the side on which the centrifugal blades are to be attached. In addition, it is unfavorable in this blast that recesses are mounted on the outer circumference of the base disk, because such recesses experience has formed a starting point for significant wear of the impeller during operation, since the recesses and the engaging there hook-shaped projections lead to flow vortices, which leads to an increased wear lead the processed from the blast wheel blasting.

document GB 2 412 890 shows a jet device according to the preamble of claims 1, 4, 8 and 11th

For the present invention, therefore, the task of creating a jet device of the type mentioned, which avoids the disadvantages set out above, in which a special simple and easy assembly and disassembly of the centrifugal blades is guaranteed with little effort and time and no additional sources of wear arise.

The solution to this problem succeeds according to the invention with a jet device according to claim 1, 4, 8 and 11.

With the invention, it is advantageously ensured that each centrifugal blade can be individually connected sufficiently reliably to the base disk provisionally, so that problem-free mounting of the centrifugal blades is possible. In assembling the spinner blades, an operator may first bring a spinner blade after the other into engagement with the base disk, in which case the holding means provide sufficient provisional support of the spinner blades on the base disk. The provisional holder must only ensure that the centrifugal blades do not fall off the base disk. Once all the spinner blades are brought into the provisional holding engagement with the base disk, the common locking means is attached, which then fixes the spinner blades finally to the base disk. The holding means for the provisional mounting of the centrifugal blades on the base disk only have to act so strongly that they hold the centrifugal blades in position relative to the base disk, for which relatively small and / or weak holding means are sufficient. During operation of the impeller, the centrifugal blades are securely clamped and fixed against the base disk by means of the common locking means, in which case the retaining means for the provisional mounting of the centrifugal blades no longer have any function. Since no particularly high demands are made on the holding means for the provisional mounting of the centrifugal blades, they can be made correspondingly compact and can be easily inserted into the receptacles in the Base disk, are integrated into the base disk itself and / or in the foot part of each skimmer, so they do not interfere appear.

The holding means for the provisional mounting of the centrifugal blades on the base disk can be realized in different designs.

A first preferred embodiment proposes that the holding means is formed by per sprocket and associated receptacle at least one transverse pin projecting on one side of a side surface or on both sides of two side surfaces of the foot and associated with the one or two corresponding side surfaces of the recording one or two pin grooves are, in which the transverse pin in a positioning of the centrifugal blade on the base disk with movement play is insertable. The cross pin and the associated pin groove or pin grooves are simple elements that can be attached or formed with little effort on the spinning blade and the base disk, so that these additional holding means do not lead to a significant increase in the cost of the centrifugal blades and the base disk. At the same time hereby but the desired effect, namely the provisional mounting of the centrifugal blades on the base disk in virtually any position of the base disk achieved.

In a further embodiment, it is preferably provided that the / each pin groove has an angled or bent course with a substantially axially extending beginning portion and a substantially radially extending end portion. With the angled or bent course of the pin groove or the pin grooves, the holding effect is particularly safe, so that even in extreme Layers of the base disk, for example, a position in which the side of the base disk to be connected to the centrifugal blades points downwards, a secure provisional support effect is achieved.

Preferably, the initial portion of the / each pin groove is located radially inward from the end portion of the / each pin groove. Hereby, the possibility is created to absorb radially outwardly acting forces of the centrifugal blades during operation of the centrifugal wheel by a fixed stop on the base disk, since the onset of the blades is associated with a movement from radially inward to outward. Thus, the radially outwardly acting fixed stop on the base disk can absorb high centrifugal forces of the centrifugal blades.

Alternatively, the holding means may be formed by per recording at least one Reibklemmelement. In this embodiment of the blast wheel, the holding effect is achieved by friction forces, which can be relatively small because they have to hold at most the weight of a centrifugal blade.

A further development suggests that the Reibklemmelement is formed by per recording one or more pen or strip-shaped body made of an elastic material, the / each Reibklemmelement is arranged in a guide bore or other suitable guide in the base disk and designed and dimensioned that it protrudes in unattached spreader blade in the receptacle that it holds in clamping used in the recording foot part of the centrifugal blade and that it is displaced with its finally locked in the centrifugal bucket of the foot part in the guide bore. In this embodiment it is achieved that the Reibklemmelement on the one hand safely fulfills its holding function and on the other hand, it does not obstruct the final locking of the centrifugal blades on the base disc in any way. A kinematic reversal of the arrangement with one or more Reibklemmelementen in or on the foot is readily possible, since this also gives the desired clamping function.

To achieve a good holding effect with relatively small cooperating surfaces, the / each Reibklemmelement is advantageously made of a rubber or an elastomer.

In order to achieve a symmetrical holding effect in this embodiment of the impeller, two Reibklemmelemente are expediently arranged opposite each other in two side surfaces of the receptacle.

A further alternative consists in that the holding means is formed by per percussion bucket and associated receiving at least one locking element. Even with one or more locking elements, the desired holding effect for a provisional mounting of the centrifugal blades on the base disk can be achieved.

A related development provides that the latching element is formed on the one hand by a latching ball loaded by a spring and on the other hand by a latching recess matching the latching ball. The detent ball loaded by a spring is a very compact and at the same time effective holding means, which can be easily integrated. The associated latching recess on the other side is particularly easy to produce.

In a further embodiment, it is preferably provided that in each case the spring-loaded detent ball is arranged in a bore in one of the side surfaces of the receptacle and that the detent recess is formed in a positionally correct manner on a side surface of the foot part of the centrifugal blade.

In a further alternative, the holding means is formed by per sprocket and associated recording at least one magnet. The desired provisional mounting of the spinning blades on the base disk can also be achieved by a magnetic force, with the advantage that, even at small distances, even small magnets achieve a high holding force.

In this case, it is preferably provided that each magnet is a permanent magnet embedded in the base disk in the region of the receptacle and that the centrifugal blades consist of a magnetizable material at least in a region cooperating with the magnet. A permanent magnet is a simple and inexpensive component that can also be easily accommodated in the base disk. Since conventional centrifugal blades are made of magnetizable steel, the magnetic holding effect is easily achieved. If desired, the spinner blade, if intrinsically made of non-magnetizable material, may be made of a magnetizable material in the region intended to cooperate with the permanent magnet, for example by an iron or steel insert in an otherwise non-magnetic metal or ceramic Shovel.

In principle, each of the various holding means described above can produce for itself the necessary holding action for the provisional mounting of the spinning blades on the base disk. However, there is also the possibility that, to increase the holding effect, the blast wheel per spinning blade and associated receptacle has a plurality of differently acting holding means. This achieves a particularly high level of safety with regard to achieving the desired provisional holding effect.

For all embodiments of the impeller described above is preferably provided that it has a releasably connectable to the base disk with the foot parts cover plate as a common locking means.

In order to achieve the locking of the centrifugal blades against the base disk on the one hand simple and reliable, it is provided that the cover plate forming the common locking means is arranged radially inwardly of the centrifugal blades and that with a radially outer peripheral portion of the cover plate each have a radially inner end portion of the foot Centrifugal blade can be clamped axially against the base disk. In this embodiment, a cover disc which is relatively small in diameter is sufficient, in which case the outer diameter of the cover disc expediently corresponds essentially to the free distance between the radially inner ends of the centrifugal blades minus a movement play.

An alternative embodiment in this respect suggests that in each case the foot part relative to the other centrifugal blade in the circumferential direction of the centrifugal wheel widened is that the locking means forming the cover plate parallel to the recordings of the base disk extending, radially outwardly open slots and that the width of the slots is dimensioned so that each one of the centrifugal blades with their foot portion adjacent non-widened area in the Slot fits. In addition to the locking function, the cover plate here protects the base disk against the action of the blasting agent, whereby the wear of the complex and expensive in the production of the base disk is significantly reduced during operation of the blast wheel.

With regard to the shaping of the foot parts is expediently provided that the foot part of each centrifugal blade is seen in cross-section rectangular or trapezoidal and that the foot part receiving receptacle is formed in each case adapted in cross-section. Since preferably the centrifugal blades should be used substantially in the axial direction in the base disk, the foot parts and the associated receptacles are preferably carried out undercuts. This means that in the case of the trapezoidal cross-section of the foot part, this becomes narrower in the direction of the base disk. This results in the insertion of the foot part in the associated receptacle in the base disk, a centering effect and an increase in the clamping action when mounting the central locking means.

In order to achieve a good effect of the blast wheel with the lowest possible weight of the blast wheel, the invention also proposes that the blast vanes project beyond the base disk radially outwards. This embodiment is easily possible in the blast wheel according to the invention, because the means for connection the spinner blades with the base disk can be arranged without problems in a region lying relatively close to the radially inner end of the spinner blades. The radially outer region of the centrifugal blades is not needed in the inventive impeller for locking the centrifugal blades on the base disk.

To connect the common locking means on the one hand as simple as possible and on the other hand as safe as possible with the base plate releasably, it is proposed that in the common locking means and in the base disk radially inward of the centrifugal blades per a central or a plurality of circumferentially distributed holes are mounted, through the bore pair / pairs of holes through a screw / screws for bracing the locking means against the base disk is / is feasible.

The centrifugal blades can run straight or curved seen in the radial direction of the impeller according to the invention. Here there is a relatively large freedom of design, because the connection of the centrifugal blades with the base disk takes place in a relatively radially inner region of the centrifugal blades. Thus, the cooperating with the blasting agent areas of the centrifugal blades can be designed largely independent of their cooperating with the base plate foot.

In order to mechanically stiffen the centrifugal blades and to obtain a guiding effect for the blast media conveyed by the centrifugal blades, it is finally provided that the centrifugal blades are provided with their radially extending edge at their foot part and / or their foot part. a reinforcing web are formed. If the centrifugal blades are formed on their edge facing the foot part with a reinforcing web, this also ensures protection of the associated recess in the base disk against ingress of blasting agent, which extends the life of the base disk.

Figur 1

ein Schleuderrad mit einem Teil einer Strahlmittelzuleitung im vertikalschnitt,

Figur 2

das Schleuderrad aus Figur 1 mit einem Teilschnitt gemäß der Schnittlinie II-II in Figur 1,

Figur 3

das Schleuderrad aus Figur 1 in Ansicht auf seine Schleuderschaufeln tragende Seite,

Figur 4

eine einzelne Schleuderschaufel in Seitenansicht,

Figur 5

die Schleuderschaufel aus Figur 4 im Querschnitt gemäß der Schnittlinie V-V in Figur 4,

Figur 6

das Schleuderrad in einer zweiten Ausführung in einem Vertikalschnitt,

Figur 7

das Schleuderrad aus Figur 6 in einem Teilschnitt gemäß der Schnittlinie VII-VII in Figur 6,

Figur 8

das Schleuderrad in einer dritten Ausführung in einem Vertikalschnitt,

Figur 9

das Schleuderrad aus Figur 8 in einem Teilschnitt gemäß der Schnittlinie IX-IX in Figur 8, und

Figur 10

das Schleuderrad in einer vierten Ausführung im Vertikalschnitt.

In the following, embodiments of the jet device according to the invention will be explained with reference to a drawing. The figures of the drawings show:

FIG. 1

a blast wheel with a part of a blasting medium supply line in vertical section,

FIG. 2

the blower wheel off FIG. 1 with a partial section according to the section line II-II in FIG. 1 .

FIG. 3

the blower wheel off FIG. 1 in view on his skid blades bearing side,

FIG. 4

a single skimmer in side view,

FIG. 5

the skimmer blade off FIG. 4 in cross-section along the section line VV in FIG. 4 .

FIG. 6

the blast wheel in a second embodiment in a vertical section,

FIG. 7

the blower wheel off FIG. 6 in a partial section along the section line VII-VII in FIG. 6 .

FIG. 8

the blower wheel in a third embodiment in a vertical section,

FIG. 9

the blower wheel off FIG. 8 in a partial section along the section line IX-IX in FIG. 8 , and

FIG. 10

the blast wheel in a fourth embodiment in vertical section.

FIG. 1 The drawing shows a vertical section of a blast wheel 1 together with a short section of a blasting medium supply line 11. A housing surrounding the blast wheel 1 with a blasting means outlet opening is not specifically shown in the drawing.

The blast wheel 1 consists of a base plate 2 with a plurality of associated spin blades 4 and a locking means 3 for the common locking of all centrifugal blades 4 on the base plate. 2

In its center, the base plate 2 has a in the drawing to the right open wave receptacle 21, with which the impeller 1 on a rotatably driven shaft, which is not shown here, can be mounted. From the central part with the shaft holder 21, the base plate 2 extends radially outward.

At the in the drawing to the left facing flat side of the base plate 2 are distributed in the circumferential direction at regular intervals several centrifugal blades 4 attached. For this purpose, the base plate 2 has at intervals in the circumferential direction distributed a plurality of radially extending, groove-shaped receptacles 24, in each of which a foot part 42 of a centrifugal blade 4 engages. Radially inside each foot part 42 has a radially inner end portion 44 which projects beyond a radially inner end edge of the actual centrifugal blade 4. This end portion 44 of the centrifugal blades 4 cooperates with a radially outer peripheral portion 33 of the locking means 3.

In the assembled state, like him FIG. 1 shows, the locking means 3 by means of a plurality of screws 31 which pass through holes 32 in the locking means 3 in threaded holes 22 in the base plate 2, respectively. In this case, the radially outer peripheral region 33 engages over the radially inner end region 44 of all foot parts 42 of the centrifugal vanes 4, as a result of which the centrifugal vanes 4 are fixed to the base plate 2.

The locking means 3 is here a part of an existing in the blast wheel 1 anyway distribution sleeve 14, which at one in the FIG. 1 upwardly facing side has an opening 15 for discharging the blasting agent. Since the locking means 3 is connected together with the distributor sleeve 14 with the rotatable base disk 2, the distributor sleeve 14 rotates with its opening 15 about the axis of rotation 10 of the centrifugal wheel 1 during operation of the centrifugal wheel 1.

With the blasting medium supply line 11, a non-rotating guide sleeve 12 is connected, which surrounds the distributor sleeve 14 with clearance and which in its circumference has a likewise pointing upward in the drawing opening 13 for a passage of the blasting agent.

As described above, all the spinner blades 4 are fixed to the base disk 2 by means of the single locking means 3. That is why it is during the assembly of Slings 4 helpful to provisionally support the spreader vanes 4 on the base plate 2 so that they do not fall off the ground spell 2, even if the common locking means 3 is not yet attached. For this purpose, according to the embodiment FIG. 1 Holding means 5 are provided, which are arranged on the foot parts 42 of the centrifugal blades 4 and / or on the receptacles 24 of the base plate 2. In the example according to FIG. 1 each holding means 5 consists of a transverse pin 55, which passes through the foot part 42 of the centrifugal blade 4 and projecting on both sides via a respective side surface 45 of the foot part 42.

The protruding parts of the cross pin 55 cooperate with each pin grooves 25 ', which are provided in two side surfaces 25 of the respective receptacle 24. This interaction is particularly in the partial section in FIG. 2 clear.

Further clarifies the FIG. 2 in that the foot part 42 of the spinning blade 4 here has a trapezoidal, conical shape in cross-section, the thickness of the foot part 42 decreasing in the direction of the receptacle 24. The receptacle 24 in turn has opposite to the side surfaces 45 of the foot 42 aligned oblique side surfaces 25.

With removed blasting agent supply line 11 and removed locking means 3, the centrifugal blades 4 by a movement first radially inward and then axially away from the base plate 2 away from the receptacles 24, including the Stiftnuten 25 'in the side surfaces 25 of the receptacles 24 have a corresponding course ,

Conversely, during assembly of the spinning blades 4, the foot parts 42 are initially moved in the axial direction toward the base disk 2 and then outwardly in the radial direction, this movement being predetermined by the profile of the pin grooves 25 '. As soon as the centrifugal vanes 4 have reached their desired position, they are held sufficiently securely on the base plate 2 by means of the transverse pin 55, which is in engagement with the pin grooves 25 ', so that an automatic falling out of the centrifugal vanes 4 from their receptacles 24 is no longer possible , The final fixation of the spinning blades 4 is then carried out by attaching the central, common locking means. 3

FIG. 3 shows the blower wheel FIG. 1 in a view of his the centrifugal blades 4 bearing side. As the FIG. 3 clarifies, the blast wheel 1 here has a total of six centrifugal blades 4, with a smaller or larger number of centrifugal blades 4 is possible.

Radially completely inside the axis of rotation 10 of the spinner 2 runs perpendicular to the plane of the drawing. Around the axis of rotation 10 around the central locking means 3 is visible in front view, which is releasably braced by means of screws 31 against the base plate 2.

The foot parts 42 of the centrifugal blades 4 and the associated receptacles 24 in the base plate 2 are here hidden by the centrifugal blades 4 and therefore indicated only in dashed lines. The holding means 5 are hidden here by the centrifugal blades 4 and therefore also shown only dashed.

FIG. 4 shows a single centrifugal blade 4 from the blast wheel 1 according to FIG. 1 in a view on one of his flat sides. Right in FIG. 4 is the foot part 42 of the centrifugal blade 4, wherein one of the side surfaces 45 facing the viewer. From this side surface 45 of the holding means 5 forming cross memo 55 protrudes with its one end perpendicular to the plane of the drawing.

Down in FIG. 4 is the radially inner end portion 44 of the foot part 42, which cooperates with the central locking means 3 in the assembled state of the impeller 1.

For stiffening the centrifugal blade 4, this has at its lateral edges in each case a reinforcing web 48, wherein the reinforcing webs 48 define a lying between these region 43 lesser material thickness.

FIG. 5 shows the spinner blade 4 according to FIG. 4 in cross section corresponding to the section line VV in FIG. 4 , Here, the course of the retaining means 5 forming transverse pin 55 through the foot part 42 is clear. In this case, the transverse pin 55 protrudes beyond the two side surfaces 45 of the foot part 42. Left of foot 42 lies in FIG. 5 the first reinforcing web 48, which is followed by the region 43 of the centrifugal blade 4 with lower material thickness. On the far left, the second reinforcing web 48 then closes the centrifugal blade 4.

FIG. 6 shows a second embodiment of the centrifugal wheel 1 in the same representation as in FIG. 1 , where in FIG. 6 but not part of the blast wheel 1 forming blasting agent supply line 11 and a part of the locking means 3 forming distributor sleeve 14 are omitted.

The blast wheel 1 according to FIG. 6 differs from the embodiment described above by the nature of the holding means 5, which in the example according to FIG. 6 is designed as Reibklemmelement 56. In the other parts, the blast wheel 1 is correct FIG. 6 with the example in FIG. 1 and it will be in terms of further in FIG. 6 Reference numerals used refer to the preceding description.

The arrangement of the holding means 5 is in the partial section according to FIG. 7 particularly clear, wherein the partial section according to the section line VII-VII in FIG. 6 runs. The holding means 5 are here formed by two mutually opposite Reibklemmelemente 56, each Reibklemmelement 56 consists of a body made of rubber or elastomer, which is arranged in each case in a guide bore 26 in the opposite side surfaces 25 of the receptacles 24 for the foot parts 42 of the centrifugal blades 4 , The Reibklemmelemente 56 are designed so that they protrude when not in the receptacle 24 located foot 42 into the receptacles 24. When inserted into the receptacle 24 foot 42 exert the Reibklemmelemente 56 a force on the foot part 42, which is sufficient to keep the spinner blade 4 sufficiently secure on the base plate 2, until finally after inserting all the spinner blades 4 in the associated receptacles 24 Arretierungsmittel 3 for common fixation of all centrifugal blades 4 is grown.

Another embodiment of the blast wheel 1 is in FIG. 8 and FIG. 9 shown. FIG. 8 is again a vertical section through the entire blast wheel 1, where also this in its individual parts with the exception of the holding means 5 coincides with the previous versions. The holding means 5 are formed here by a respective locking element 57, which, like the partial section in FIG. 9 shows, is formed by a loaded with a spring 57.2 detent ball 57.1. Matching to the arrangement of the detent ball 57.1 in one of the side surfaces 25 of the receptacle 24 in the base plate 2, a detent recess 47 is formed in the associated side surface 45 of the foot part 42 of the centrifugal blade 4. The spring 57.2 and the ball 57.1 are guided in a bore 47 which extends perpendicular to the plane of the side surface 25 in the base plate 2. The receptacle 24 facing the end of the bore 27 is reduced in size so that the ball 57.1 is held in the bore 57, but may protrude beyond the side surface 25 in the receptacle 24.

The detent ball 57.1 and the detent recess 47 cooperate in such a way that a centrifugal blade 4 inserted in its receptacle 24 is held sufficiently securely so that falling out of the centrifugal blade 4 from the base plate 2 is avoided, even if the common central detent 3 is not yet attached ,

With regard to the further reference numbers in the FIGS. 8 and 9 Reference is made to the preceding description.

FIG. 10 Finally, shows a last embodiment of the blast wheel 1, which again differs with respect to the holding means 5 from the preceding embodiments. In the example below FIG. 10 the holding means 5 by per recording 24, a permanent magnet 58 is formed. Depending on a permanent magnet 58 is inserted below the foot part 42 in the receptacle 24 in the base plate 2. When inserted into the receptacle 24 Foot part 42 is the underside in the immediate vicinity of the foot 42 facing the top of the permanent magnet 58, whereby the magnet 58 exerts a magnetic holding force on the of a magnetizable material, usually steel, existing centrifugal blade 4. If the spinner blade 4 as a whole is not made of a magnetizable material, the foot part 42 can be produced by itself from a magnetizable material or be equipped with an insert of a magnetizable material in a region opposite to the permanent magnet 58. Even with the aid of the permanent magnet 58, the associated centrifugal blade 4 can be held sufficiently securely on the base disk, respectively, until the locking means 3 is mounted for joint fixation of all the centrifugal blades 4.

By the holding means 5, as mentioned, the centrifugal blades 4 sufficiently initially held provisionally in the base plate 2 without an operator must maintain the stop manually, which is virtually impossible with two hands anyway, or stop by additionally attached provisional Must produce holding means. As a result, the assembly of the centrifugal blades 4 on the base plate 2 is easy and can be done in a short amount of time. Also, the attachment and detachment of the common central locking means 3 requires only a small amount of work, so that the maintenance of the spinner wheel 1, in particular the replacement of its wear part representing spinner blades 4, is facilitated and accelerated. This minimizes downtimes of an associated jet device.

Claims (23)

1. An abrasive blasting device with a blast wheel (1), a housing surrounding the blast wheel (1), the housing having an abrasive supply line (11) and an abrasive outlet aperture, wherein the blast wheel (1) comprises a single basic disk (2) which is connectable to a drive shaft and a plurality of blasting blades (4) which are connected to the basic disk (2) in a detachable manner, wherein the basic disk (2) comprises one receptacle (24) per blasting blade (4), wherein each blasting blade (4) comprises a foot section (42) fitting into the receptacle (24),
   characterized in that
   the blast wheel (1) comprises one single common locking means (3) for locking all blasting blades (4) in a detachable manner and bracing all of said blasting blades (4) against the basic disk (2) in an axial direction and wherein at least one retaining means (5) for temporarily retaining the blasting blades (4) on the basic disk (2) until the common locking means (3) is attached and locked is allocated to each receptacle (24) in the basic disk (2) and/or to each foot section (42) of the blasting blades (4), wherein the retaining means (5) is formed by at least one transverse pin (55) per blasting blade (4) and associated receptacle (24), said transverse pin (55) projecting from one lateral surface (45) of the foot section (42) on one of its sides or from two lateral surfaces (45) of the foot section (42) on both of its sides, with one or two pin grooves (25' ) being allocated to said transverse pin (55) in one or two of the corresponding lateral surfaces (25) of the receptacle (24), said transverse pin (55) being insertable into said pin grooves (25' ) with motional play while the blasting blade (4) is positioned on the basic disk (2), and that, with the abrasive supply line (11) having been removed and the locking means (3) having been removed, the blasting blades (4) can be removed from the receptacles by a movement first in a radially inward direction and then in an axial direction away from the basic disk (2) and that, while the blasting blades (4) are installed, the foot sections (42) can, vice versa, be moved first in an axial direction towards the basic disk (2) and then in a radially outward direction.
2. The abrasive blasting device according to Claim 1, characterized in that the/each pin groove (25' ) extends in an angled or a bent-off direction with an axially extending initial section and a radially extending end section.
3. The abrasive blasting device according to Claim 2, characterized in that the initial section of the/each pin groove (25' ) is arranged in a radially inward direction from the end section of the/each pin groove (25' ).
4. An abrasive blasting device with a blast wheel (1), a housing surrounding the blast wheel (1), the housing having an abrasive supply line (11) and an abrasive outlet aperture, wherein the blast wheel (1) comprises a single basic disk (2) which is connectable to a drive shaft and a plurality of blasting blades (4) which are connected to the basic disk (2) in a detachable manner, wherein the basic disk (2) comprises one receptacle (24) per blasting blade (4),
   characterized in that
   each blasting blade (4) comprises a foot section (42) fitting into the receptacle (24), wherein the blast wheel (1) comprises one single common locking means (3) for locking all blasting blades (4) in a detachable manner and bracing all of said blasting blades (4) against the basic disk (2) in an axial direction and wherein at least one retaining means (5) for temporarily retaining the blasting blades (4) on the basic disk (2) until the common locking means (3) is attached and locked is allocated to each receptacle (24) in the basic disk (2) and/or to each foot section (42) of the blasting blades (4), wherein the retaining means (5) is formed by at least one frictional clamping element (56) per receptacle (24), and that, with the abrasive supply line (11) having been removed and the locking means (3) having been removed, the blasting blades (4) can be removed from the receptacles by a movement first in a radially inward direction and then in an axial direction away from the basic disk (2) and that, on installation of the blasting blades (4), the foot sections (42) can, vice versa, be moved first in an axial direction towards the basic disk (2) and then in a radially outward direction.
5. The abrasive blasting device according to Claim 4, characterized in that the frictional clamping element (56) is, per receptacle (24), formed by at least one pin-shaped or strip-formed body made of an elastic material, wherein the frictional clamping element (56) is arranged in a drilled guide hole (26) in the basic disk (2) and is formed and dimensioned such that it projects into the receptacle (24) while the blasting blade (4) is not installed, that it retains the blasting blade (4) in a clamping manner while the foot section (42) of the blasting blade (4) is inserted into the receptacle (24), and that it is displaced into the drilled guide hole (26) by the foot section (42) of the blasting blade (4) while the blasting blade (4) is finally locked.
6. The abrasive blasting device according to Claim 5, characterized in that the frictional clamping element (56) is made of a rubber or an elastomer.
7. The abrasive blasting device according to Claim 5 or 6, characterized in that two frictional clamping elements (56) are arranged opposite to each other in two lateral surfaces (25) of the receptacle (24).
8. An abrasive blasting device with a blast wheel (1), a housing surrounding the blast wheel (1), the housing having an abrasive supply line (11) and an abrasive outlet aperture, wherein the blast wheel (1) comprises a single basic disk (2) which is connectable to a drive shaft and a plurality of blasting blades (4) which are connected to the basic disk (2) in a detachable manner, wherein the basic disk (2) comprises one receptacle (24) per blasting blade (4), wherein each blasting blade (4) comprises a foot section (42) fitting into the receptacle (24),
   characterized in that
   the blast wheel (1) comprises one single common locking means (3) for locking all blasting blades (4) in a detachable manner and bracing all of said blasting blades (4) against the basic disk (2) in an axial direction and wherein at least one retaining means (5) for temporarily retaining the blasting blades (4) on the basic disk (2) until the common locking means (3) is attached and locked is allocated to each receptacle (24) in the basic disk (2) and/or to each foot section (42) of the blasting blades (4), wherein the retaining means (5) is formed by at least one detent element (57) per blasting blade (4) and associated receptacle (24) and that, with the abrasive supply line (11) having been removed and the locking means (3) having been removed, the blasting blades (4) can be removed from the receptacles by a movement first in a radially inward direction and then in an axial direction away from the basic disk (2) and that, on installation of the blasting blades (4), the foot sections (42) can, vice versa, be moved first in an axial direction towards the basic disk (2) and then in a radially outward direction.
9. The abrasive blasting device according to Claim 8, characterized in that the detent element (57) is, on the one hand, formed by a detent ball (57.1) that is loaded by a spring (57.2) and, on the other hand, by a detent recess (47) that matches the detent ball (57.1).
10. The abrasive blasting device according to Claim 9, characterized in that each spring-loaded detent ball (57.1) is arranged in a drilled hole (27) in one of the lateral surfaces (25) of the receptacle (24) and that the detent recess (47) is formed at an adequate position on a lateral surface (45) of the foot section (42) of the blasting blade (4).
11. An abrasive blasting device with a blast wheel (1), a housing surrounding the blast wheel (1), the housing having an abrasive supply line (11) and an abrasive outlet aperture, wherein the blast wheel (1) comprises a single basic disk (2) which is connectable to a drive shaft and a plurality of blasting blades (4) which are connected to the basic disk (2) in a detachable manner, wherein the basic disk (2) comprises one receptacle (24) per blasting blade (4), wherein each blasting blade (4) comprises a foot section (42) fitting into the receptacle (24),
    characterized in that
    the blast wheel (1) comprises one single common locking means (3) for locking all blasting blades (4) in a detachable manner and bracing all of said blasting blades (4) against the basic disk (2) in an axial direction and wherein at least one retaining means (5) for temporarily retaining the blasting blades (4) on the basic disk (2) until the common locking means (3) is attached and located is allocated to each receptacle (24) in the basic disk (2) and/or to each foot section (42) of the blasting blades (4), wherein the retaining means (5) is formed by at least one magnet (58) per blasting blade (4) and associated receptacle (24) and that, with the abrasive supply line (11) having been removed and the locking means (3) having been removed, the blasting blades (4) can be removed from the receptacles by a movement first in a radially inward direction and then in an axial direction away from the basic disk (2) and that, on installation of the blasting blades (4), the foot sections (42) can, vice versa, be moved first in an axial direction towards the basic disk (2) and then in a radially outward direction.
12. The abrasive blasting device according to Claim 11, characterized in that each magnet (58) is a permanent magnet that is embedded in the basic disk (2) in the vicinity of the receptacle (24) and that the blasting blades (4) are made of a magnetizable material at least in a region cooperating with the magnet (58).
13. The abrasive blasting device according to anyone of the preceding claims, characterized in that it comprises a plurality of retaining means (5) per blasting blade (4) and associated receptacle (24), said retaining means (5) being effective in different manners.
14. The abrasive blasting device according to anyone of the preceding claims, characterized in that, as the common locking means (3), it comprises a cover disk that can be connected to the basic disk (2) in a detachable manner and with the foot sections (42) being clamped in.
15. The abrasive blasting device according to Claim 14, characterized in that the cover disk forming the common locking means (3) is arranged in a radially inward direction from the blasting blades (4) and that a radially inward end region (44) of the foot section (42) of each blasting blade (4) can be braced against the basic disk (2) in an axial direction each with a radially outward circumferential region (33) of the cover disk.
16. The abrasive blasting device according to Claim 14, characterized in that, in relation to the remaining blasting blade (4), each foot section (42) is broadened in circumferential direction of the blast wheel (1), that the cover disk forming the locking means (3) comprises slots that extend in parallel to the receptacles (24) of the basic disk (2) and are open in a radially outward direction, and that the width of the slots is dimensioned such that one of the blasting blades (4) each fits into the slot with its non-broadened region (43) neighboring the foot section (42).
17. The abrasive blasting device according to anyone of the preceding claims, characterized in that, as seen in cross-section, the foot section (42) of each blasting blade (4) is rectangular or trapezoidal in shape and that the receptacle (24) receiving the foot section (42) is also rectangular or trapezoidal in shape, each respectively matching in its cross-section.
18. The abrasive blasting device according to anyone of the preceding claims, characterized in that the blasting blades (4) project beyond the basic disk (2) in a radially outward direction.
19. The abrasive blasting device according to anyone of Claims 1 to 18, characterized in that one central drilled hole (22, 32) is placed in each of the common locking means (3) and the basic disk (2) in a radially inward direction from the blasting blades (4), wherein a screw (31) can be guided through the pair of drilled holes (22, 32), said screw (31) being provided to brace the locking means (3) against the basic disk (2).
20. The abrasive blasting device according to anyone of Claims 1 to 18, characterized in that a plurality of drilled holes (22, 32) that are distributed in circumferential direction are placed in the common locking means (3) and the basic disk (2) in a radially inward direction from the blasting blades (4), wherein a plurality of screws (31) can be guided through the pairs of drilled holes (22, 32), said screws (31) being provided to brace the locking means (3) against the basic disk (2).
21. The abrasive blasting device according to anyone of the preceding claims, characterized in that the blasting blades (4) extend in a straight line as seen in radial direction.
22. The abrasive blasting device according to anyone of the preceding claims, characterized in that the blasting blades (4) extend in a bent line as seen in radial direction.
23. The abrasive blasting device according to anyone of the preceding claims, characterized in that the blasting blades (4) are formed with one reinforcing web (48) each on their edge arranged apart from the foot section (42) and/or on their edge facing the foot section (42) and extending in radial direction.

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