EP2470329B1 - Blasting material storage device - Google Patents

Description

The invention relates to a blasting medium storage for blasting equipment, in which for surface treatment abrasive is directed at high speed on workpieces. In particular, stationary blast machines usually have a blasting agent circuit with a blasting agent storage in order to reduce the blasting agent consumption by reuse of the blasting agent.

From the blasting agent storage blasting agent is directed by gravity through lines to one or more blast accelerating devices, which then accelerate the abrasive towards the workpiece. The blast accelerating devices may include, for example, blast wheels or blast systems operated by compressed air.

The blasting agent is collected after impacting the workpiece and transported by means of transport components, such as screw conveyors, conveyor belts, vibrating conveyor troughs, vibrating conveyor tubes or bucket elevators, to various processing units to be cleaned and reprocessed for reuse. Such processing units include, for example, a pneumatic sifting, screening and Kom form sorting.

The cleaned blasting agent is finally fed back to the blasting agent storage. Caching in the blasting media store is particularly required to bridge the time delay that elapses between the beginning of the blasting process and the provision of the processed Blasting agent for reuse arises. The blasting agent storage serves, so to speak, as an intermediate storage, in order to ensure that all blasting agent consumers are supplied without interruption with purified blasting agent.

Conventional blasting agent storage, as for example DE 33 38 980 C2 and CH 551 256 A are known are formed as a simple solid, which are usually located above the highest Strahlmittelbeschleunigungsvorrichtung. Due to the force of gravity, the blasting medium reaches the blast-medium accelerating devices via a plurality of processes arranged at the bottom of the blasting agent reservoir and hose lines connected thereto.

In blasting medium stores which supply a larger number of consumers, several, mostly juxtaposed outlets are provided, often an elaborate distribution of the blasting agent storage supplied blasting agent is provided by pivotable blasting media slides or screw conveyors to always at high Abrasive flow rates and / or low blasting medium level ensure uninterrupted supply of all outlets with blasting media. In particular, it is intended to prevent a bulk cone from forming in the blasting agent accumulator which reliably supplies blasting media located close to the blasting medium inlet, but not more distant outlets.

A continuous blasting agent supply to all consumers is important, since even a short interruption of the blasting medium supply of individual blasting medium accelerating devices would lead to an uneven blasting result that subsequently becomes difficult to correct.

It is therefore an object of the invention to provide a blasting agent storage, which ensures a reliable and continuous supply of all connected Strahlmittelbeschleunigungsvorrichtungen with blasting.

The object is achieved by the features of claim 1 and in particular by a blasting agent storage with a plurality of buffer tanks for storing blasting agent, each having at least one inlet for filling with blasting agent and at least one outlet for supplying a Strahlmittelbeschleunigungsvorrichtung with stored blasting agent, wherein the buffer tank offset in height are arranged and at least one buffer tank has an overflow, flows over the overflowing during the filling of the buffer tank blasting agent under the influence of gravity in a lower-lying buffer tank.

In the case of the blasting agent storage device according to the invention, therefore, conditioned blasting agent flowing in initially passes into a first buffer vessel. As soon as this buffer container is filled, the overflowing blasting medium flows under the influence of gravity into a lower-lying buffer container. Depending on the number of buffer tanks, this process is repeated until all buffer tanks are filled. The cascade-shaped arrangement of the buffer container ensures that there is always sufficient blasting medium available to supply all the blast accelerating devices connected to the outlets. It is understood as a matter of course that over a longer period of time the blasting agent amount flowing to the blasting agent storage is not or only slightly smaller than that over the whole the outlets to the blasting agent consumer emitted blasting agent.

At the beginning of a blasting operation where the blasting media used has not yet passed through all the treatment stages and is available for re-use, or in the case of a momentary interruption of the supply of abrasive blasting agent storage means, the buffer tanks ensure that all the blasting means acceleration devices continue to provide at least some Be supplied with blasting agent evenly.

All buffer containers of the blasting agent storage can have the same volume. However, it is also possible to use buffer containers of different volumes to accommodate different-use blasting media accelerating devices, with the buffer containers adapted to consumption such that the maximum buffering period is approximately equal for all the blast accelerating devices.

In principle, the buffer container volume can also be chosen to be greater, the deeper the relevant buffer container is arranged in the cascade. Thus, the certain time delay in refilling the buffer container can be taken into account, since due to the cascade arrangement, the higher-lying buffer container are first filled.

Another advantage of the cascaded arrangement of the buffer container in the blasting medium storage according to the invention is that at a höhenmäßig staggered arrangement of the blasting accelerators higher consumers with higher-lying Puf ferbehältern and deeper consumers with lower-lying buffer tanks can be connected. This shortens the length of the hose feed lines, in particular for the lower-lying consumers, and the trickling speed of the blasting medium in these hose lines is considerably reduced, so that the service life of these hose lines is significantly increased. In addition, there is an approximation of the buffer volumes, since ultimately the volume stored in the hose lines must be added to the buffered blasting agent volume.

Finally, with the blasting medium storage device according to the invention, a substantial reduction in the overall height of the blasting installation can be achieved. While in conventional blasting agent storage the entire storage volume must be located above the highest consumer, it is sufficient in the blasting medium storage according to the invention, when only a partial volume, namely the volume of the highest buffer container is located above the highest consumer.

According to an advantageous embodiment of the invention, part of the buffer containers are associated with a first group of buffer containers and another part with the second group of buffer containers horizontally spaced from the first group, the buffer containers of each group being vertically stacked and the groups being vertical Direction are offset from one another in such a way that overflowing abrasive flows from a buffer tank of a group to a directly below this arranged buffer tank of the same group via a buffer tank of the other group. The blasting agent flowing from a buffer container of one group to a buffer container of the same group arranged directly below it takes a detour via a buffer container of the other group. In this arrangement, the flow path of the overflowing blasting agent runs in a zigzag from the one, so to speak Group of buffer containers to the other group. This makes it possible to achieve a particularly compact design.

Preferably, the overflow is designed such that during the filling of a buffer tank overflowing abrasive is directed in the direction of the inlet of the immediately below the buffer tank. This allows a simple construction of the blasting agent storage.

Advantageously, the inlet is formed by an opening provided at the top of the buffer container. If the overflow is formed by a recess of an edge delimiting the opening, in particular by a recess in a side wall, the buffer containers can be very easily manufactured.

Alternatively, the overflow of a buffer tank can also be connected via a line to a lower-lying buffer tank. This ensures that the overflowing abrasive reaches as completely as possible in the lower-lying buffer tank.

At least one buffer container preferably has the shape of a funnel. This ensures that the stored blasting agent can reach the outlet of the buffer tank solely by the action of gravity.

According to a further advantageous embodiment, the buffer containers are at least partially disposed in the interior of a collecting container, which preferably has at least one outlet for supplying a blasting medium accelerating device. In this embodiment, that blasting agent is collected, which is not completely absorbed by overflowing buffer containers when overflowing becomes. In addition, the collecting container provides an additional buffer volume, so that the intermediate spaces between the individual buffer containers can also be utilized. This significantly increases the buffer volume. Via the at least one outlet of the collecting container further consumers can be supplied with blasting agent. In addition, this outlet allows complete emptying of the blasting agent storage.

According to another advantageous embodiment, a portion of the buffer container comprising the inlet within the collecting container and / or a section of the buffer container comprising the outlet is provided outside the collecting container, wherein in particular all buffer containers are arranged at least in sections in the collecting container. In this arrangement, as it were, the buffer containers penetrate an outer wall of the collecting container, so that the outlets of the individual buffer containers are accessible from the outside. This simplifies both the design and installation of the blasting media storage as well as its subsequent maintenance.

Further advantageous embodiments of the invention are specified in the subclaims, the description and the drawings.

Fig. 1

eine perspektivische Ansicht von zwei spiegelsymmet-risch zueinander ausgebildeten Pufferbehältern eines erfindungsgemäßen Strahlmittelspeichers;

Fig. 2

eine perspektivische Ansicht eines erfindungsgemäßen Strahlmittelspeichers in halbtransparenter Darstellung; und

Fig. 3

einen Querschnitt durch einen erfindungsgemäßen Strahlmittelspeicher.

The invention will be explained below with reference to an embodiment with reference to the drawings. Show it:

Fig. 1

a perspective view of two mirror-symmetrical to each other formed buffer containers of a blasting agent storage according to the invention;

Fig. 2

a perspective view of a blasting agent according to the invention in a semi-transparent representation; and

Fig. 3

a cross section through a blasting agent storage according to the invention.

Fig. 1 2 shows two buffer containers 12A, 12B which, in addition to a collecting container 26, are part of a blasting agent store 10 according to the invention ( Fig. 2 and 3 ). The mirror-symmetrical to each other formed buffer container 12A, 12B have a funnel-shaped shape and are made for example of sheet metal, in particular sheet steel.

Both buffer containers 12A, 12B each include a bottom 18, which is horizontally aligned and has an outlet 22 for the blasting agent. The outlet 22 can be connected by means of a hose, not shown, with a blasting medium acceleration device, also not shown. At the bottom 18, a sloping wall 20 connects, which is inclined in the illustrated embodiment by about 45 ° relative to the bottom 18 obliquely upwards. On the two longitudinal sides of the inclined wall 20 and the bottom 18, two side walls 14, 16 are attached.

At a distance from the oblique wall 20, a cover wall 24 is provided, which is likewise fastened to the base 18 and the side walls 14, 16. The top wall 24 is inclined relative to the oblique wall 20 such that the cross section of the buffer tank 12 A or 12 B tapers in the direction of the outlet 22.

A vertical surface delimited by vertical edges of the side walls 14, 16 and an upper edge of the top wall 24, after installation into the collection container 26 (FIG. Fig. 2 ) is completed by a portion of an end wall 28 of the collecting container 26.

The upper edges of the side walls 14, 16 and the oblique wall 20 define, together with the end wall 28, an inlet 30 for the blasting medium.

As in particular in Fig. 1 can be seen well, the one side wall 14 is shorter than the other side wall 16, so that the upper edge of the side wall 14 is lower than the upper edge of the side wall 16. If the buffer ferbehälter 12A, 12B now filled with blasting, then flows at Achieving the maximum filling amount overflowing abrasive always on the upper edge of the side wall 14 from the buffer tank 12A, 12B addition. The upper edge of the side wall 14 thus defines together with a portion of the end wall 28 and the free portion of a longitudinal edge of the inclined wall 20 has a recess which forms an overflow for the excess blasting agent and this also directs in a desired direction.

Regarding Fig. 2 and 3 Now, the arrangement of the buffer container 12A, 12B in the substantially cuboid collecting container 26 and the operation of the blasting agent storage 10 will be explained in more detail.

At the bottom of the collecting container 26, one or more outlets 22 are also provided. A lower portion of the collecting container 26 is funnel-shaped for easier removal of blasting agent 36.

The end wall 28 has a total of five passages 32, in each of which a buffer container 12A or 12B is arranged such that the respective passage 32 is closed by an outer buffer container portion 34. This outer buffer container section 34 comprises in each case the bottom 18 with the outlet 22, the cover wall 24 and lower sections of the side walls 14, 16.

The oblique wall 20 and the larger part of the side walls 14, 16 and the inlet 30 are located in the interior of the collecting container 26.

Three buffer tanks 12A are arranged vertically one above the other on a front left side of the end wall 28 and form a first group of buffer tanks 12A. Two buffer containers 12B are arranged vertically one above the other on the right-hand side of the end wall 28 and form a second group of buffer containers 12B. Thus, the overflows of the first group of buffer containers 12A are on the right side while the overflows of the second group of buffer containers 12B are on the left side. The overflows of one group are thus facing the overflows of the other group.

Further, the two groups of buffer tanks 12A and 12B are horizontally spaced apart and vertically offset from each other so that alternately a buffer tank 12A of the first group or a buffer tank 12B of the second group is provided in the end wall 28 in the vertical direction. So if you would connect a buffer tank with the nearest buffer memory by means of an imaginary line, the result would be a zigzag line.

Looking now in particular Fig. 3 , it is clear how the individual buffer container 12A, 12B are filled with blasting agent 36 flowing in from above. First, the blasting agent 36 fed to the blasting medium store 10 flows into the upper buffer container 12A of the first group of buffer containers 12A. Once filled, the now overflowing abrasive 36 flows over the overflow, ie beyond the upper edge of the side wall 14, out of the upper buffer vessel 12A and into the second group of buffer vessels 12B through the inlet 30 of the upper buffer vessel 12B.

When this buffer container 12B is also filled, the blasting agent 36 flows via its side wall 14 into the middle buffer container 12A of the first group of buffer containers 12A.

The process is repeated accordingly, so that the lower buffer container 12 B and 12 A are successively filled. As soon as the lower buffer container 12A of the first group of buffer containers 12A is completely filled, the overflowing blasting agent 36 finally collects at the bottom of the collecting container 26.

For receiving a larger amount blasting agent 36, such as at the end of the blasting process, when the Strahlmittelbeschleunigungsvorrichtungen are already switched off, but still processed blasting agent 36 flows from above into the blasting agent storage, the interior 38 of the collecting container 26 can be used for additional blasting medium storage. The blasting agent 36 stored in the interior 38 of the collecting container 26 can later be removed again, depending on the filling level, both via the buffer containers 12A, 12B and via the outlet or outlets 22 provided at the bottom of the collecting container 26.

As already mentioned above, the buffer containers 12A, 12B shown here have equal volumes. However, it is also possible that the volume of the respective buffer container 12A, 12B increases from top to bottom, in order to compensate for the staggered filling of the buffer container cascade.

Alternatively, the overflows of the buffer containers can also be connected via lines to the inlets of the respective lower-lying buffer containers, so that the buffer container cascade represents a closed system. In the case can be dispensed with a collecting container, as overflowing abrasive completely enters the lower-lying buffer tank.

LIST OF REFERENCE NUMBERS

10

Blasting material storage

12A, 12B

buffer tank

14, 16

Side wall

18

ground

20

scaling wall

22

outlet

24

top wall

26

Clippings

28

bulkhead

30

inlet

32

passage

34

Buffer tank portion

36

blasting agent

38

inner space

Claims (10)

1. A blasting means store comprising a plurality of buffer containers (12A, 12B) for storing blasting means (36), each having at least one inlet (30) for filling with blasting means (36) and having at least one outlet (22) for supplying a blasting means acceleration apparatus with stored blasting means (36),
   wherein the buffer containers (12A, 12B) are arranged vertically offset and at least one buffer container (12A, 12B) has an overflow via which blasting means (36) overflowing on the filling of the buffer container (12A, 12B) flow under the effect of gravity into a buffer container (12A, 12B) disposed further below.
2. A blasting means store in accordance with claim 1,
   characterised in that
   the buffer containers (12A, 12B) are arranged above one another, with in particular two respective buffer containers (12A, 12B) arranged directly above one another having a lateral offset with respect to one another.
3. A blasting means store in accordance with claim 1 or claim 2,
   characterised in that
   a portion of the buffer containers (12A, 12B) is associated with a first group of buffer containers (12A) and another portion is associated with a second group of buffer containers (12B) horizontally spaced apart from the first group, with the buffer containers (12A, 12B) of each group respectively being arranged vertically above one another and the groups being arranged offset with respect to one another in the vertical direction such that overflowing blasting means (36) flows from a buffer container (12A) of the one group via a buffer container (12B) of the other group to a buffer container (12A) of the same group arranged directly below it.
4. A blasting means store in accordance with any one of the preceding claims,
   characterised in that
   an overflow is respectively configured such that, on the filling of a buffer container (12A, 12B), overflowing blasting means is conducted in the direction of the inlet (30) of the buffer container (12A, 12B) arranged directly below.
5. A blasting means store in accordance with any one of the preceding claims,
   characterised in that
   the inlet (30) is formed by an opening provided at the upper side of the buffer container (12A, 12B).
6. A blasting means store in accordance with claim 5,
   characterised in that
   the overflow is formed by a cut-out of a margin bounding the opening, in particular by a cut-out in a side wall (14), with the cut-out preferably facing the inlet (30) of a directly adjacent buffer store (12A, 12B).
7. A blasting means store in accordance with any one of the claims 1 to 5,
   characterised in that
   the overflow of a buffer container (12A, 12B) is connected via a line to a buffer container (12A, 12B) disposed further below.
8. A blasting means store in accordance with any one of the preceding claims,
   characterised in that
   at least one buffer container (12A, 12B) has the form of a funnel.
9. A blasting means store in accordance with any one of the preceding claims,
   characterised in that
   the buffer containers (12A, 12B) are arranged at least sectionally in the interior of a collection container (26) which preferably has at least one outlet (22) for supplying a blasting means acceleration apparatus with stored blasting means (36).
10. A blasting means store in accordance with claim 9,
    characterised in that
    a section of the buffer containers (12A, 12B) comprising the inlet (30) is provided within the collection container (26) and/or a section (34) of the buffer containers comprising the outlet (22) is provided outside the collection container (26), with in particular all buffer containers (12A, 12B) being arranged at least sectionally in the collection container (26).

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