WO2008110148A2 - Device for delivering a blasting medium, in particular ice, ice pellets, ice snow, or a water-soluble blasting agents - Google Patents

Abstract

A device (10) is described for delivering a blasting medium (12), particularly ice, ice pellets, ice snow, or a water-soluble blasting agent. Said device (10) comprises a container (14) for the blasting medium (12), a delivery device (18) for delivering the blast medium (12) from the container (14) into a distributor device (28), and a device (16) for loosening the blasting medium (12) in the container (14). The delivery device (18) has at least one piston (16) that is movable back and forth in the container (14) such that the piston (16) is able to pick up at least part of the blasting medium (12) provided in the container (14) and deliver it to the distributor device (28).

Description

 Apparatus for conveying blasting medium, in particular ice, ice pellets, ice snow or water-soluble

Abrasive.

The invention relates to a device for conveying a blasting medium, in particular of ice, ice pellets, ice snow or water-soluble blasting agent, with

a) a container for the blasting medium,

b) a conveying device for conveying blasting medium out of the container into an output device,

c) a device for loosening the jet medium in the container.

Moreover, the invention relates to a novel transport system for dry ice pellets or dry ice snow.

A device for conveying within the meaning of the invention can also be referred to as a transport system.

Market-known devices for conveying blasting media in the form of dry ice are used in dry ice blasting installations in which a mixture of compressed air and dry ice is used for cleaning components or removing paints. For the application of dry ice or dry snow (hereinafter referred to as ice) to mix with compressed air to clean soiled items, the ice was usually transported by a snail. The amount of ice • was regulated by the speed of the screw.

In addition, blenders for the dry ice air mixture additionally had mostly knockers on the ice containers, which were usually designed as funnels. The knocker loosens the ice to prevent clumping. In known devices separate devices and thus a variety of components are required for dosing and locomotive core.

The object underlying the invention is to design a device or a transport unit of the type mentioned above so that it transports and at the same time loosens the blasting medium, in particular (dry) ice pellets or (dry) ice snow or water-soluble blasting agent. This should preferably be as simple as possible, especially with few components.

This object is achieved in that

d) the conveyor has at least one piston which is movable back and forth in the container, such that the piston can take at least a portion of provided in the container blasting medium and the delivery device can supply.

According to the invention, therefore, a piston is provided which acts as a conveying means as well as a means for loosening the jet medium. Under a piston in the

- 3 According to the invention, a body can be understood which is suitable for converting pressure and kinetic energy, without being limited to a cylindrical shape. The piston reciprocates in the jet medium in the container. By moving the piston in the steel medium, this is set in motion, loosened and thus can not clump or stick together. At the same time, the piston carries part of the blasting medium and feeds it to the dispensing device. Thus, the blasting medium is conveyed and loosened at the same time with few components in a simple way. On a separate device for loosening the jet medium can be dispensed with. This saves components and thus costs. In addition, the simple design reduces the risk of component failure. The service life is extended and downtimes are reduced.

In an advantageous embodiment, a cylinder can be provided, which is open towards the container, and in which the piston is reciprocable such that at least a part of the piston can protrude into the container. In this way, the piston is guided. This makes it possible to prevent the piston from leaving its path of movement, in particular if it encounters resistance when it is pierced into the blasting medium. The cylinder according to the invention can be understood as a component of a piston engine. It is not limited to a cylindrical shape, but rather has an interior space in which the piston according to the invention can be moved back and forth.

_ 4 _ Advantageously, the cylinder may have an output channel, which can be supplied to the blasting medium entrained by the piston. The output channel can be used to simply connect a line, for example, to a blasting gun.

In order to enable a continuous conveyance and loosening of the blasting medium, the piston can be repeatedly reciprocated, in particular oscillatingly.

Further, advantageously, a drive, in particular a pneumatic, hydraulic or electric drive, be provided for moving the piston, with which simply a particular continuous promotion and loosening of the jet medium can preferably be done automatically.

In a further advantageous embodiment, the piston may have at least one receiving means, in particular a recess, for entraining blasting medium. With the receiving means, in particular by its receiving volume, a flow rate of blasting medium per cycle of movement of the piston can be easily specified, so that with the device according to the invention a dosage of blasting medium from the container is easily possible. In particular, because of the displacement and / or gravity, the jet medium can get into the recess and is carried along during the movement of the piston.

- 5 - In order to improve the displacement and loosening of the blasting medium in the container, in particular to reduce the resistance when the piston penetrates into the blasting medium, the piston can advantageously be shaped as a displacer, at least in a region that is reciprocable in the container , in particular tapering towards an end face.

In a further advantageous embodiment, at least one fluid channel, in particular an air channel, can be provided, via which a fluid can flow for advancing the jet medium entrained by the piston. Thus, the jet medium conveyed by the piston can simply be mixed with the fluid from the fluid channel, in particular air, and be moved therewith.

In order to easily change the flow rate of the jet medium, the oscillation amplitude, in particular the stroke height, and / or the oscillation frequency, in particular stroke frequency, of the piston can be varied.

In the transport system according to the invention, the object is achieved in that a piston oscillates in the ice.

The essential advantage of this embodiment of the transport system according to the invention is that the ice is conveyed and loosened at the same time in a simple manner. In an advantageous embodiment, the ice can be loosened by the stroke of the piston in the ice.

Further advantages, features and details of the invention düng will become apparent from the following description in which an embodiment of the invention is explained in detail with reference to the drawing; show it

Figure 1 shows schematically a side section of a dry ice container with a piston for För ¹ - countries of dry ice, which is located in an upper position in the dry ice container;

Figure 2 shows schematically a side section of the dry ice container of Figure 1, wherein the piston is in a lower position.

In FIGS. 1 and 2 there is shown an apparatus for conveying dry ice 12, generally designated by the reference numeral 10, which comprises a dry ice container 14 which is charged with dry ice 12.

Figures 1 and 2 show a side view of the dry ice container 14, formed as a funnel, a vibrating piston 16 and an ice outlet.

At its lower side in FIGS. 1 and 2, which forms the tip of the funnel, there is a conveyor 18 for the dry ice 12.

- 7 - The conveying device 18 comprises a cylinder 20, in the interior 22 of which the piston 16 can be moved back and forth between an upper position shown in FIG. 1 and a lower position shown in FIG.

The interior 22 of the cylinder 20 is open on its side facing the dry ice container 14 and its side facing away from the dry ice container 14, so that the piston 16 in its upper position and its lower position can protrude from the inner space 22 in part.

A first transverse channel 26, which comes from the outside of the cylinder 20 and is open there, opens into an air opening 24 in the inner surface of the cylinder 20 bounding the inner space 22. Through the first transverse channel 26 and the air opening 24, air can flow into the interior 22.

From one of the air opening 24 opposite the discharge opening 30 in the inner peripheral surface of the inner space 22, a second transverse channel 28 leads to the discharge of the dry ice 12 to the outside of the cylinder 20 and is open there. Connected to the second transverse channel 28 is a dry ice line 32 shown in FIG. 2, which leads to a blasting gun or another dispensing tool for dry ice 12 which is not shown here and which is of no further interest here. The piston 16 is provided with a recess 34 into which the dry ice 12 falls. The recess 34 extends along the peripheral side of the piston 16.

The dry ice container 14 facing side of the piston 16 is tapered.

The piston 16 can be moved by means of pneumatic, hydraulic or electric drive 36.

In its upper position, the piston 16 protrudes so far into the dry ice container 14 with its pointed side that the recess 34 is located outside the interior 22 in the dry ice container 14.

In the lower position of the piston 16, the recess 34 overlaps with the transverse channels 26 and 28 and thus connects them together. The piston 16 protrudes in this position only with its tapered portion in the dry ice container 14th

During a movement of the piston 16 in the direction of its upper position, it penetrates with its tapered side ahead into the dry ice 12 befindli- dry ice 12.

In Figure 1, the piston 16 is shown in the upper position as it pierces the ice 12. By the penetration of the piston 16 in the ice 12, the ice 12 is displaced and thus set in motion and loosened.

- 9 - Dry ice 12 reaches the recess 34 of the piston 16.

After reaching the upper position of the piston 16 is moved in the opposite direction to its lower STEL ^■ lung. In this case, dry ice 12 reaches the space released by the piston 16 again. The dry ice 12 in the dry ice container 14 is thus constantly kept in motion and clumping or sticking is prevented.

The dry ice 12 in the recess 34 is entrained by the piston 16, wherein the entrained amount among other things by the receiving capacity of the recess 34 is given. In this way, simply a dosage of the conveyed dry ice 12 is realized.

In Figure 2, the piston 16 is shown at the lower position. The ice 12 located in the recess 34 is now via the transverse channel 28 by means of negative pressure in

Aspirated in the direction of arrow 38 and fed to the blasting gun. Via the transverse channel 26, air in the direction of an arrow 40 to the recess 34 of the piston 16 to allow the extraction of the dry ice 12 and to achieve a flushing of the piston recess 34 with air. Thus, all of the ice 12 is removed from the piston 16.

Now the piston 16 is moved back to the upper position and the whole process is repeated.

10 - The delivery rate of dry ice 12 can be influenced by the oscillation frequency of the piston 16.

In all the above-described embodiments of a device 10 for conveying dry ice 12, the following modifications are possible, inter alia:

The invention is not restricted to the conveying, metering and loosening of dry ice 12. Rather, it can also be used for other, preferably pellet, snow, granular or granular jet media, for example ordinary ice, dry ice pellets, dry ice snow or water-soluble jet media ,

The inner space 22 of the cylinder 20 may be closed completely or partially instead of open on its side remote from the dry ice container 14, provided that the extent of the interior 22 of the cylinder 20 in the direction of movement of the piston 16 is sufficient to accommodate the piston 16 to such an extent the recess 34 overlaps with the transverse channels 26 and 28.

Instead of the transverse channels 26 and 28 and obliquely running channels can be used.

The dry ice 12 located in the recess 34 can be supplied by means of compressed air from the first transverse channel 26 via the second transverse channel 28 of the dry ice line 32 instead of by means of negative pressure.

- 11 - The piston 16 and the cylinder 20 may also be arranged so that the piston 16 moves obliquely to the vertical.

Instead of the stroke frequency, the amount of dry ice 12 to be delivered can also be achieved by limiting the depth of immersion of the piston 16 into the dry ice 12 in the dry ice container 14. For example, the piston 16 can only be moved so far out of the cylinder 20 that the recess 34 is only partially released.

Instead of only one piston 16, a plurality of pistons 16 can also be used for removing, dosing and loosening the drying ice 12.

Instead of tapering, the piston 16 can also be tapered in another form, for example bent or spherical, concave or convex.

Claims

claims 1. Device (10) for conveying a blasting medium (12), in particular of ice, ice pellets, ice snow or water-soluble blasting agent, with a) a container (14) for the blasting medium (12), b) a conveyor (18) for the promotion of Blasting medium (12) from the container (14) in .eine output device (28), c) a device (16) for loosening the jet medium (12) in the container (14); characterized in that d) the conveyor (18) has at least one piston (16) which is reciprocable in the container (14) such that the piston (16) comprises at least a portion of jet medium provided in the container (14) (12) and can feed the output device (28). 2. Device according to claim 1, characterized by a cylinder (20) which is open to the container (14) and in which the piston (16) is reciprocally movable, such that at least a part of the piston (16 ) can protrude into the container (14). - 2 - 3. Apparatus according to claim 1 or 2, characterized in that the cylinder (20) has an output channel (28) to which the piston (16) entrained blasting medium (12) can be supplied. 4. Device according to one of the preceding claims, characterized in that the piston (16) is repeated in particular swinging back and forth movable. 5. Device according to one of the preceding claims, characterized by a drive (36), in particular a pneumatic, hydraulic or electric drive, for moving the piston (16). 6. Device according to one of the preceding claims, characterized in that the piston (16) has at least one receiving means, in particular a recess (34) for entrainment of jet medium (12). 7. Device according to one of the preceding claims, characterized in that the piston (16) at least in a region which is reciprocable in the container (14) back and forth, is shaped as a displacer, in particular tapers to a front side. 8. Device according to one of the preceding claims, characterized by at least one fluid channel, in particular an air channel (26), via which a fluid for advancing the of the piston (16) mitgenomme- nem jet medium (12) can flow. - 3 - 9. Device according to one of the preceding claims, characterized in that the oscillation amplitude, in particular lifting height, and / or the oscillation frequency, in particular stroke frequency, of the piston (16) can be vari- iert. 10. transport system (10) for dry ice pellets or dry ice snow, characterized in that by means of one or more oscillating piston (16) with at least one recess (34) the ice (12) is conveyed by a stroke. 11. transport system for dry ice pellets or dry ice snow according to claim 10, characterized in that by the stroke of the piston (16) in the ice (12), the ice (12) is loosened.