DE2355831A1 - DEVICE FOR CONVEYING BAG GUARDS - Google Patents

Description

A 40 208 m

u - 162

October 30, 1973

company

Schüttgutfördertechnik AG CH-6300 Zug / Switzerland

Device for conveying bulk goods

The invention relates to a device for conveying bulk goods, in particular sand and gravel, with a conveying line, at the lower free end of which is connected to a pressure medium line connected conveyor head is arranged.

In the known devices for conveying bulk materials, E.g. in dredgers for pumping sand and gravel from rivers and lakes there is the difficulty of getting the pipeline with the

509821/0055

DR.-INS. DIPL.-ΙΝβ. M. SC. DI-L.-PKYS. OR 'DIPL.-PWY ·. HÖGER - LEGAL RIGHTS - GRIBSSBACH - HAECKER PATENT LAWYERS IN STUTTGART

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adjust the delivery head located on it to the correct delivery depth. The water depth of a lake or river can be very different, so it is often necessary during pumping is to change the depth setting of the delivery head. In conventional excavators with a rigid delivery pipe this can be done essentially in two different ways.

It is known to raise or lower the rigid pipe in its entirety. The upper end of the delivery pipe protrudes more or less vertically above the surface of the water. A vertical displacement of a rigid Conveying pipe over more than approx. 8m is difficult to carry out. In addition, the conveyance of the bulk material from the upper end of the conveying line is difficult because of the flexible connection of the delivery pipe with a collecting container for the Bulk material must be provided. Finally, the production can take place in a production pipe that ends many meters above the water surface can only be achieved with very high pressure.

A second possibility, the effective depth of the delivery head to change, is to mount the delivery pipe pivotable about at the level of the water surface and it, for example to bring it into an inclined position with the help of winches. However, this is only possible within a small angular range, because otherwise the delivery head attached to the lower end of the delivery pipe would be swiveled out of its optimal working position and its delivery rate drops. This is the area in

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which the depth of the delivery head can be varied, significantly limited.

It is the object of the invention to avoid these disadvantages and with the upper end of the conveyor pipe being mounted in a substantially stationary manner to keep the working depth variable over a much larger area than before without changing the optimal working position of the delivery head.

This is achieved according to the invention in that the at the top End in the longitudinal direction immovably mounted conveyor line of at least two sealed telescoping one into the other There is pipe sections and that the space between the pipe sections with a pressurized barrier medium, preferably pressurized water, is filled to prevent the penetration of contaminants between the pipe sections.

The following description of preferred embodiments of the invention is used in conjunction with the drawing for more detailed information Explanation. Show it:

Fig. 1 is a schematic side view of a

preferred embodiment of the invention;

2 shows a longitudinal section of the conveying line consisting of telescopic pipe sections;

Fig. 3 is a partial section along the line 3-3 in Fig. 2;

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Fig. 4 is a sectional view similar to Fig. 3 taken along line 4-4 in Fig. 2;

Fig. 5 is a sectional view taken along line 5-5 in Fig. 2;

FIG. 6 shows a detail from FIG. 1 on an enlarged scale; FIG.

Figure 7 is a section along line 7-7 in Figure 6;

Figure 8 is a section along line 8-8 in Figure 7;

9 is a partially sectioned view of a hose reel along 9-9 in FIG and

FIG. 10 is a sectional view taken along line 10-10 in FIG. 9.

In Fig. 1 is a schematic overall view of a preferred embodiment of the inventive device for conveying of bulk goods, here in particular of sand and gravel stored under water. Basically is suitable the invention but also for dry bulk materials. The pre

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direction comprises a float 1, which consists of two adjacent, hollow pontoons connected by flanges. With the floating body 1 is a delivery line 2 for the bulk material conveyed from the bottom of the body of water. According to the invention, it consists of an outer pipe section 5, in which a second, inner pipe section 6 of a slightly smaller diameter is telescopically displaceable. At the bottom of the inner pipe section 6 is a known conveyor head 7 arranged, which picks up the bulk material to be conveyed and passes it on to the conveying line 2. For example, it can consist of a box-shaped housing with an opening at the bottom, at the top of which the delivery line 2 is flanged. In addition, the delivery head 7 is provided with a pressure medium line tied together. This line 8 leads parallel to the delivery line 2 up to the floating body 1 and is there with a pressure medium pump 9 connected. Compressed air or water, for example, can be used as the pressure medium. The pressure medium is supplied by the pump 9 printed through the line 8 into the conveying head and introduced into it e.g. against the conveying direction. He fulfills it two functions, namely the loosening of the solidified Subsurface and the transport of the water mixed with the bulk material through the delivery line 2 upwards.

According to the invention, the inner pipe section 6 is displaceable in the outer pipe section 5 in the longitudinal direction. This is an.dem inner pipe section 6 or attached to the rigidly connected delivery head 7, a rope 11, which is from one on the Floating body 1 arranged winch l2 can be wound up and unwound. When winding, the inner pipe section 6

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inserted into the outer pipe section 5 when unwinding the The rope 11 is extended again from the outer pipe section 5 by the winch 12 due to its own weight. This can increase the length the delivery line 2 can be varied over a wide range. For example, the outer pipe section 5 can have a length of up to 40 meters, the inner pipe section 6 accordingly. This means that the length of the conveying line 2 can be continuously between 40 and 80 meters, for example adjusted.

So that the weight of the above statements may be quite long delivery line 2 for the bracket on the float 1 does not become too large, a further pipe 13 is arranged parallel to the outer pipe section 5, which is provided with flanges 14 is connected to the pipe section 5. This tube 13 is closed on all sides and at least partially empty. This learns it creates a buoyancy in the water and thus reduces the weight acting on the holder of the delivery line 2. The buoyancy of the Pipe 13 is dimensioned so that most of the weight of the delivery line 2 is compensated and the delivery line 2 is therefore '' only acts with a low weight on the holder on the float. The tube 13 can be flanged into individual ones Chambers 15, 16, 17 can be divided. In addition to reducing the effective weight of the delivery line 2, it serves at the same time their stiffening.

The outer pipe section 5 consists of individual subsections 5a, 5b, 5c, which are connected to one another by flanges 46, 47 and 48, 49 are. These flanges are integral with the chambers

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15, 16, 17 final flanges 14 and therefore also serve to stiffen the pipe section 5. By the Subdivision of the outer pipe section 5 into subsections 5a, 5b, 5c facilitates its assembly.

The outer pipe section 5 is on the floating body 1 in its longitudinal direction immovable, but not rigidly arranged, but rotatably mounted in a known manner by means of two horizontal joints 3 and 4 standing at right angles to one another. The joint 3 is rotatable in the vertical longitudinal plane of the floating body 1, the joint 4 transversely thereto (FIG. 6). To the panning the delivery line 2 to enable the joints 3 and 4, the delivery line 2 is designed to be flexible in the area of the joints 3, 4. The delivery line 2 can thus forward and can be swiveled backwards and to the right and left. On the floating body 1 are two winch stands 18 and 19 with winches 21 and 22 are provided, on each of which a rope 21a or 22a connected to the lower part of the pipe section 6 is wound is (Fig. 1). With the help of these cable winches, the conveying line 2 can be pivoted around the joint 3, e.g. for transport and be transferred almost to the horizontal. Since the effective weight of the delivery line 2 through the buoyancy tube 13 is very small, this is easily possible.

The pressure medium line 8 runs parallel to the delivery line 2 from Float 1 to the delivery head 7. It is in the lower part in a length that is approximately the length of the inner pipe section is designed as a rigid tube 23. This is provided at its upper end with a carriage 24 carrying rollers 25 (Fig. 2). On the outside of the outer pipe section 5 is

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A Doppe1 T-rail 26 is arranged running parallel to this over its entire length. When extending and retracting the inner pipe section 6, the upper end of the pipe 23 is guided by the rollers 25 in this rail 26. To the The upper end of the tube 23 is connected to a flexible line 27 which is wound onto a hose reel 28 on the floating body 1 is. Depending on how far the inner pipe section is extended and how deep the upper end of the pipe 2 3 is positioned, the flexible line 27 is more or less unwound from the hose reel 28.

The hose reel 28 consists of a horizontally mounted drum 29 (FIGS. 9 and 10), the axis 31 of which is hollow. she is mounted in two pivot bearings 32 and 33 and sealed on one side with a sealing lip 34 against a stationary seal 35. On this side, the axis 31 is connected to the pressure medium pump 9 via a supply line 36, on which on the other side, it is closed by a locking piece 37 which also serves as a bearing pin. The hollow axle 31 is also connected to a hose pipe 38 leading radially to the surface of the drum 29. This is at Exit from the drum surface bent tangentially to this and carries at its end a flange 39 to which the flexible print media line 27 is flanged. The line 27 can be wound onto the drum 2 9 by rotating it are and always remains with the supply line leading to the pressure medium pump 9 via the hose pipe 38 and the hollow axle 31 36 connected.

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The drum 29 can be driven directly by the rope 11, for example which is used to raise and lower the inner pipe section. However, it can also be driven, for example, by a rope / that on a wheel rim arranged next to the drum 29 41 is wound up and is wound up or unwound by a winch 40. The winding and unwinding is always carried out in such a way that that the flexible line 27 is always unwound and wound up from the drum 29 at the same speed with which the inner pipe section 6 is extended or retracted.

The pump 9 uses air or water as the pressure medium in the delivery head 7 pressed. To absorb the water is the. Pump 9 with a water intake line provided with a sieve 42 43 connected, which feeds the water from the lake or river to the pump. To suck in air, a pipe 44 is provided which sucks in air via an air filter 45 (FIG. 1).

In Fig. 2, the telescoping pipe sections 5 and 6 are shown enlarged. The diameter of the inner pipe section 6 is chosen so that between the pipe section 5 and a gap 51 remains free for the pipe section 6. At the top, the inner pipe section 6 is preferably made of a an elastic material consisting of a sleeve 52 with an annular, on the inner wall of the outer tube section 5 adjacent sealing lip 53 provided, which the annular. Intermediate space 51 closes at the top. Below the cuff 52 is another guide member made of elastic material, in particular a guide ring 54,

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which is used primarily to guide the inner pipe section 6 in the outer pipe section 5. He is by screws 55 between two metal rings 56 and 57 held, which are also placed around the inner pipe section 6. The outer diameter of the guide ring 54 is selected to be a small amount smaller than the clear width of the outer pipe section 5,

On the underside, the outer pipe section 5 is surrounded by a flange 58; at these is another short one, with a flange 61 provided pipe section 59 flanged. Between the two flanges 58 and 61 is an annular one Seal 62 is provided. The pipe section 59, like the pipe section 5, is made of metal and has a slightly larger diameter than this. A further guide member, in particular a guide ring 63, is arranged on its inner wall inside diameter is larger by a small amount than the outer diameter of the inner pipe section 6. It preferably consists made of an elastic material.

Through the two guide rings 54 on the top of the inner Pipe section 6 and 63 on the underside of the outer pipe section 5 is the inner pipe section 6 in the outer pipe section 5 guided and jamming of the inner pipe section 6 prevented.

The short pipe section 59 carries on its underside a flange 64 to which another short one, also with a Flange 65 provided pipe section 66 is flanged. Between the two flanges 64 and 65 is an annular one

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Gasket 67 arranged »The pipe section 66 is made of metal, its inner diameter is by a small amount larger than the outer diameter of the inner pipe section but smaller than the inner diameter of the outer pipe section 5.

The pipe section 66 carries at its lower end a flange 68, on the outside of which a short, downwardly pointing flange Metal cylinder 69 is attached. Inside this cylinder 69 is between the flange 68 and a metal ring 71 by means of screws 72 a wide annular sealing collar 73 made of elastic material is pressed in. Its outside rests firmly against the metal cylinder 69, its inside firmly against the outer diameter of the inner pipe section 6. Through this sealing collar 73, the ring-shaped The space 51 between the pipe section 5 and the pipe section 6 is tightly closed at the bottom.

To secure the inner pipe section 6 against twisting, are on its outside essentially over the entire length of two opposing guide strips 74 and 75 arranged. They are guided in longitudinal grooves 76 in the thick metal wall of the pipe section 66 are embedded (Fig. 3). To prevent jamming of the guide strips 74 and 75 in the grooves 76, is between There is a play in the groove and guide bar.

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The elastic guide ring 6 3 also has corresponding grooves which are also designed so that there is play between the groove and guide bar. The sealing collar 73 also has corresponding grooves (FIG. 4); but it is very close to the Guide strips 74 and 75 to achieve a good seal of the space 51 to the outside. At the top of the Guide strips 74 and 75 are arranged just below the guide ring 54 two stop pieces 78 and 79, which when Lowering of the inner pipe section 6 sit e.g. on the flange 61 and thus prevent the inner pipe section 6 can be pushed down completely out of the outer pipe section 5.

According to the invention, the space 51 between the inner pipe section 6 and the outer pipe section 5 is with a pressurized barrier medium, preferably pressurized water, filled. This barrier medium is through a barrier medium line 81 inserted into the space 51 directly above the sealing collar 73. The line 81 is connected to a locking agent pump connected to the floating body 1. This sucks in water via a line 83 and transports it under pressure into the Space 51.

The barrier medium fills the entire intermediate space 51 and serves as lubrication between the guide rings 54, 63 and the pipe sections 5, 6. In particular, it prevents the penetration of sand, gravel or other through its overpressure Impurities in the space 51 and only allows

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thereby the inventive construction of a telescopic Suction pipe. The at the upper end of the inner pipe section 6 arranged cuff 52 with the sealing lip 53 is designed so that that the Sperrraedium between the sealing lip 53 and the inner wall of the outer pipe section 5 emerge slightly can. This ensures that e.g. when the inner pipe section 6 is pushed in, sand and stones pass through the barrier medium are flushed away and cannot get between the sealing lip 53 and the wall of the outer pipe section 5.

In order to push out the inner pipe section 6, in which the Gap 51 becomes smaller to remove the excess barrier medium is in the lower part of the outer pipe section 5, e.g. in the pipe section 59 one provided with a pressure relief valve 84 Overpressure line 85 is provided. When the inner pipe section 6 is pushed out, the pressure of the barrier medium increases long until the valve 84 opens and the excess barrier medium is discharged to the outside through the overpressure line 85 will. When the inner pipe section is pushed in, the pump 82 re-enters the barrier medium via the line 81 Intermediate space 51 is pumped.

The pump 82 is designed in a known manner so that when a certain pressure is reached in the space 51 by itself switches off when falling below a certain minimum pressure of the blocking medium also switches on again.

The embodiment of the invention described is not that the only possible realization of the inventive idea, there are other embodiments are also possible. As a cross section of the

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Telescopic pipe sections 5 and 6 come in addition to the circular shape other shapes are also possible, in particular oval, triangular, square shapes or the like Dimensional stability of the pipe sections 5 and 6 can be achieved. In addition, the inner pipe section 6 is in the outer pipe section 5 automatically secured against rotation about the longitudinal axis; the guide strips 74 and 75 and the grooves 76 can be omitted.

It is not absolutely necessary to form the pressure medium line 8 rigidly and by means of a carriage 24 in a double T-rail 26 lead. It is quite possible, especially in the case of less long embodiments of the suction pipe 2, that to lead flexible line 2 7 directly from the hose reel 2 9 to the delivery head 7. It is also not absolutely necessary that to be provided as a floating body and stiffening tube 13. In the case of a shorter delivery pipe 2, this could be omitted.

The extension of the inner pipe section 6 can, especially if this is only short, instead of using the rope 11 and the winch 12 can also be carried out hydraulically or pneumatically by a piston-cylinder unit. Another way to The drive of the inner pipe section is to design the guide strips 74, 75 as toothed racks, which with a mesh on the outer pipe section 5 mounted gear, which is also firmly connected to the outer pipe section 5 by a Motor may be driven via a gearbox. There can also be more than two pipe sections for a telescopic Extension of delivery line 2 can be used, e.g. for longer delivery lines.

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It is only important that the working length of the conveyor pipe 2 through telescopically telescopic tube sections is continuously adjustable and that the space between the Pipe sections with a pressure medium serving as a barrier medium is filled because this is the only way to prevent impurities, e.g. sand and gravel, from penetrating between the pipe sections will.

The fact that the working depth of the delivery pipe 2 by the Aus and insertion of one or more pipe sections is continuously adjustable, the upper end of the conveyor pipe can essentially be stored in a fixed location. This allows the use of a simple baffle to slow down the transported Bulk goods. In particular, it can be built much lower and does not need a vertical insertion slot, which is necessary for conveying devices in which the upper end of the conveying pipe can be adjusted vertically.

A special version of the impact container is shown in Figs. 6 to 8 shown. It is a simple impact head 91, which is at the end of a horizontal, over a curved. Raer 92 with the upper end of the conveyor line 2 connected pipe 93 is arranged. The impact head 91 is essentially a downward-facing elbow that is open at the bottom. The bulk material, which is pressed upwards by the pressure medium through the delivery line 2 and mixed with water, becomes in the elbow 92 and braked in the impact head 91.

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This simple arrangement of a horizontal impact container enables the combination of the relatively small impact head 91 with a classifying drum 94 for sorting the bulk material according to different sizes. It consists of a horizontal rotatably mounted screen cylinder 95 with an open -92 and a closed 96 end face.

This is mounted on rollers 98 which are rotatably mounted parallel to the cylinder axis and which are somewhat above on its outer jacket 99 roll off the underside of the cylinder. The middle part of the screen cylinder 95 is of a frustoconical drum Surrounded coaxially, the smaller diameter of which is greater than the diameter of the screen cylinder 95. At the smaller diameter the drum 101 is firmly connected to the screen cylinder 95 so that it is closed on this side. On the other, the side facing the open end face 97 of the screen cylinder 95, on the other hand, is open. In the overlap area of the drum 101, the screen cylinder 95 has openings 102. These can be formed, for example, by the fact that the screen cylinder 95 consists of two halves 103 and 104 which are held together by horizontal bars 105. The spaces in between The openings 102 then form between the rods 105.

The horizontal tube 93 with the impact head attached is inserted coaxially into the rotating screen cylinder 95. the end the conveyed bulk material falls onto the inner jacket of the screen cylinder 95 through the impact head. Through an inside of the screen cylinder 95 arranged, the pipe 93 and the impact head 91 surrounding auger 106 is the bulk material on the open end

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surface 97 of the screen cylinder 95 transported. As soon as it is pushed over the openings.102, all components fall of the bulk material, which are smaller than the openings 102, through them into the surrounding drum 101. In the screen cylinder 95 only large stones remain, which are taken from the Conveyor screw 106 to the open end 97 of the screen cylinder 95 can be transported further. There they fall over a slide 107 onto a conveyor belt 108 and are transported on to a collecting container. Including the smaller material Sand and water slide to the open side of the drum 101 and fall out of it. It can be known in itself Way onto a vibrating sieve 109 which is provided with openings 111 which are smaller than the openings 102 in the sieve cylinder 95 are. As a result of the shaking movement of the shaking sieve, the finer material falls through the openings 111, for example Another vibrating sieve 112 with even smaller openings 113. Middle stones then remain on the vibrating sieve 109, which are caused by the shaking movement of the somewhat inclined vibrating sieve 109 via a conveyor belt 110 into a corresponding collecting container. Similarly, e.g. on the Vibrating sieve 112 collected fine gravel, which is similarly fed to a container. Below the vibrating sieve For example, a container 114 serving as a sump can be arranged, in which what has fallen through all openings 102, 111 and 113 Mixture of sand and water is collected. A separator pump 115 separates the sand from the water in a manner known per se away; the sand is fed to a collecting tank, the water is pumped back into the lake or river. The screen cylinder 95 does not always have to be rotated, the bulk material can also be transported in that the screen cylinder only vibrates. - 18 -

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It is possible to use the screen cylinder 95 not only with a drum 101, but to provide a further drum coaxially surrounding the drum. The outer surface of the drum 101 would then have to be provided with openings in the area of the drum surrounding it in a manner similar to that of the screen cylinder 95, but which are smaller than the openings 102. In this way, there is not just a double classification but one Multiple classification of the bulk material according to the size of the components possible.

The use of the described, from a rotating screen cylinder existing classifier with one or more surrounding drums is for use in conjunction with the The device according to the invention for conveying bulk material is particularly advantageous because of the fixed height of the conveying line 2 a stationary horizontal impact head arrangement can be pushed into the interior of the classifier. Of course you can this combination of a horizontal impact head with a horizontal rotary drum classifier is also used in other conveying devices can be used where the introduction of a stationary impact head is possible. This is e.g. always then the case when the upper end of the delivery line is not adjustable in height.

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Claims (1)

A 40 208 m, u - 162_ " Oct. 30, 1973 Patent claims: lJ apparatus for conveying bulk materials, in particular sand ^ - ^ and gravel, is arranged with a conveyor line, at whose lower free end a connected to a pressure medium line feed head "', characterized in that the non-displaceably mounted in the longitudinal direction at the upper end of the conveying line (2 ) consists of at least two pipe sections (5, 6) telescoping in a sealed manner and that the space (51) between the pipe sections (5, 6) is filled with a pressurized barrier medium, preferably pressurized water, to prevent the penetration of contaminants between the pipe sections (5, 6) to prevent. 2. Apparatus according to claim 1, characterized in that the outer pipe section (5) by means of a double joint (3, 4) is mounted pivotably about horizontal axes in two mutually perpendicular planes. . . 3. Apparatus according to claim 2, characterized in that the conveying line (2) in the area of the double joint (3, 4) is flexible. 509821/0055 u - 162 Oct. 30, 1973 4. Device according to one of claims 1, 2 or 3, characterized characterized in that the conveying head (7) is arranged at the lower end of the inner pipe section (6). 5. Device according to one of the preceding claims, characterized in that the cross section of the pipe sections (5, 6) is circular. 1 to 4 6. Device according to one of the preceding claims, characterized characterized in that the cross section of the pipe sections (5, 6) is oval. I to 4 7. Device according to one of the preceding claims, characterized in that the cross section of the pipe sections (5, 6) is triangular, square or polygonal. 8. Device according to one of the preceding claims, characterized in that the intermediate space (51) between the outer pipe section (5) and the inner pipe section (6) of two elastic sealing collars (52,73) is sealed. 9. Apparatus according to claim 8, characterized in that the upper sealing collar (52) at the upper end of the inner Pipe section (6) arranged and with a sealing lip resting on the inner jacket of the outer pipe section (5) (53) is provided, which is so elastically bendable from this inner jacket that it has a slight exit the barrier medium from the space (51) allowed. 509821/0 0 55 u - 162 Oct. 30, 1973 10. Device according to one of the preceding claims, characterized in that at the upper end of the inner Pipe section (6) and at the lower end of the outer pipe section (5) Guide members (54, 63) for guiding the inner pipe section (6) in the outer pipe section (5) are arranged. 11. Device according to one of the preceding claims, characterized in that the inner pipe section (6) is provided to prevent rotation about its longitudinal axis with two guide strips (74, 75) extending essentially over its entire length, ax in corresponding longitudinal grooves (76 , 77) of the outer pipe section (5) are guided. 12. The device according to claim 11, characterized in that the guide strips (74, 75) are designed as racks ¹ and mesh with a gear mounted on the outer pipe section (5), which for retracting and extending the inner pipe section (6) by a on the outer pipe section (5) attached motor can be driven. 13. Device according to one of the preceding claims, characterized characterized in that stop pieces (78, 79) are provided at the upper end of the inner pipe section (6) are that when extending the inner pipe section (6) encounter a stop (61) and thereby prevent the inner pipe section (6) from extending too far. 509821/00 5 5 u - 162 Oct. 30, 1973 -Each - 14. Device according to one of the preceding claims, characterized in that the intermediate space (51) in the Proximity of the lower end of the outer pipe section (5) for the supply of pressurized barrier medium mit.einer Barrier media supply line (81) is connected, in turn is in communication with a barrier medium pump (82). 15. Apparatus according to claim 14, characterized in that the barrier medium pump (82) is designed so that it moves when a certain pressure is reached in the intermediate space (51) switches itself off and on again when the pressure drops. 16. Device according to one of the preceding claims, characterized characterized in that in the vicinity of the lower end of the outer pipe section (5) for draining off the excess Barrier medium an overpressure line (85) with a pressure relief valve (84) is provided. 17. Device according to one of the preceding claims, characterized in that parallel to the conveying line (2) To compensate for their weight, a tube (13), which is closed on all sides and which serves as a floating body, is rigidly connected to the Delivery line (2) is connected. 18. The device according to claim 17, characterized in that the tube (13) consists of individual chambers (15, 16, 17). 509821/0055 u - 162 Oct. 30, 1973 19. Device according to one of the preceding claims, characterized characterized in that parallel to the conveying line (2) on the outer pipe section (5) essentially over the latter A guide rail (26) for the entire length running to the delivery head (7) leading pressure medium line (8, 23) is provided. 20. Device according to one of the preceding claims, characterized in that the pressure medium line (8, 27) is flexible at least in the upper part. 21. Apparatus according to claim ..20, characterized in that the flexible pressure medium line (27) can be wound onto a hose reel (28) and via a feed line (36) is in communication with a pressure medium pump (9). 22. Apparatus according to claim 21, characterized in that the hose reel (2 8) has a hollow shaft (31) closed on one side, which on the one hand connects to the supply line (36) and on the other hand via a hose tube (38) leading radially outward with the flexible pressure medium line (27) is in connection. 23. The device according to claim 22, characterized in that the connection of the rotatably mounted hollow axis (31) is sealed with the stationary supply line (36) by a seal (35). - 6 - 509821/0 OB 5 A 40 208 in U - 162 Oct. 30, 1973 24. Device according to one of the preceding claims, characterized characterized in that the delivery line (2) at her. upper end via an elbow (92) and a substantially horizontal pipe (93) is connected to an impact head (91). 25. The device according to claim 24, characterized in that that the impact head (91) consists of a downwardly pointing, open at the bottom pipe bend. 26. Device according to one of claims' 24 or 25, characterized in that the impact head (91) inside a is arranged around a horizontal axis rotating classification drum (94). 27. The device according to claim 26, characterized in that the classifying drum (94) comprises a sieve cylinder (95) with openings (102) in the outer jacket (99) which are so large are that the smaller components of the conveyed bulk material fall through them, the large components, especially stones, however, remain inside the screen cylinder. 28. The device according to claim 27, characterized in that a screw conveyor (106) in the interior of the screen cylinder (95) is arranged for the transport of the bulk material. 509821/0055 A 40 208 m u - 162 Oct. 30, 1973 9. Device according to one of claims 2 7 or 28, characterized in that the screen cylinder (95) in the area in which its jacket (99) has the openings (102), coaxially of a preferably frustoconical drum (101) is surrounded, which on the side of its smaller diameter with the jacket (99) of the screen cylinder (95) firmly and tightly connected and open on the opposite side. 30. Apparatus according to claim 29, characterized in that the screen cylinder (95) is coaxially surrounded by more than one drum (101), which apart from the outermost drum in the Covering area have openings with a size in the jacket which decreases from the innermost drum towards the outside. 09821/00