EP4012181B1 - Delivery device for thick substance - Google Patents

Description

The present invention relates to a thick matter conveying device, in particular a concrete pump, according to the preamble of claim 1.

To convey thick matter such as concrete, special thick matter pumps are usually used, which pump the thick matter from a thick matter collection container into a delivery line by means of hydraulically driven delivery cylinders. In pumps of this type, the delivery cylinders have an opening at one end which is connected to a corresponding intake opening in the housing of the thick matter collection container in order to be able to suck in the thick matter and then pump it into the delivery line by means of a pump stroke. During operation of such high-density matter pumps, both tensile and compressive forces occur at the connection points of the delivery cylinders to the high-density matter collection container. It is characteristic that the tensile forces acting outwards are higher than the compressive forces acting in the opposite direction (towards the sludge collection tank).

In the case of solutions known from the prior art, the delivery cylinders are usually connected to the thick matter collection container via tie rods or flange connections and attached to the water box, with both the high tensile and low compressive forces being transmitted in the same way via the same bolted connections. The disadvantage of this is that tie rods have a high dead weight, whereas flange connections on the outside of the thick matter collection tank (and on the water box) take up a lot of space, ie take up more space. An example of the state of the art is EP0854285 .

The object of the present invention is therefore to improve the connection of the delivery cylinders to the thick matter collection container.

According to the invention, this object is achieved by a thick matter conveying device having the features of claim 1 . Accordingly, a thick matter conveying device is proposed, in particular for conveying concrete, which comprises at least one conveying cylinder, by means of which thick matter can be conveyed from a thick matter collecting container into a conveying line. According to the invention, the feed cylinder is attached to the thick matter collection container in such a way that tensile forces of the feed cylinder acting during the conveyance of thick matter are transmitted to the thick matter collection container via a positive connection and pressure forces acting in the opposite direction are transmitted to the thick matter collection container via a further connection, i.e. a different form-fit connection to the aforementioned connection.

When the at least one delivery cylinder is connected according to the invention, the operating loads are transmitted on separate paths, in contrast to known devices. While the low compressive forces continue to be transmitted via a screw connection, for example, a connection based on positive locking is provided to transmit the higher tensile forces. In addition to a slim design, this enables the use of a connection designed for lower compressive forces, since the higher tensile forces are introduced in a different way by means of a form fit. The use of heavy tie rods can be dispensed with here.

Overall, the present invention provides a stable connection to the attachment point(s) of the delivery cylinder(s), which guarantees reliable transmission of the high forces during delivery operation and also allows the connection to be easily released from the service side. Furthermore, this type of connection achieves better voltage curves.

Advantageous embodiments of the invention result from the dependent claims and the following description.

In one embodiment it is provided that the further connection is a screw connection, a bolt connection or a positive connection using a securing element or securing ring. Combinations of these connection types for the further connection are also conceivable here. The further connection is preferably not located on an outside of the thick matter collection container. In particular, the further connection is therefore not a flange connection on the outside of the thick matter collection container. A more compact design can be achieved by dispensing with bulky flange screw connections, which, for example, enables the use of larger delivery cylinders. For this purpose, the element producing the form fit with the housing of the thick matter collecting container can itself be screwed to the thick matter collecting container.

In a further embodiment, it is provided that the delivery cylinder has a cylinder housing with a cylinder opening, which is connected to a suction opening formed in a housing of the thick matter collection container, with the form-fitting connection preferably being located in or on the suction opening (or in the region of the suction opening). . In particular, the cylinder housing can be screwed to the housing of the thick matter collection container in or on the suction opening. Thick matter can be sucked out of the thick matter collection container via the suction opening and pushed through again, in particular via a transfer tube into a delivery line. The suction opening thus also functions as a pressure opening.

In a further embodiment it is provided that the cylinder housing is at least partially accommodated in the intake opening. The cylinder housing is thus fully or partially passed through the intake port. It preferably reaches up to a wear plate mounted on the inside of the sludge collector. As a result, the material to be conveyed can pass from the conveying cylinder directly through the wearing plate into the conveying line or a diverter valve that is preferably provided without interfering edges or a throttling effect. In this case, it is advantageously possible to dispense with the use of intermediate rings.

In a further embodiment, it is provided that the delivery cylinder is positively connected to a housing of the thick matter collection container via a stop. The stop can be formed directly on the cylinder housing, for example as a projection or collar that is welded on or formed in one piece, or can be realized via a separate component. The form fit created by the stop acts in the direction of the acting tensile forces, i.e. outwards starting from the housing of the thick matter collector.

In a further embodiment, a counter-stop is provided on the housing of the thick matter collection container, which interacts with the stop in order to block movement of the delivery cylinder away from the suction opening by positive locking, the counter-stop preferably being formed within the suction opening or through the inside of the thick matter collecting container . The counter-stop can be formed, for example, by a groove or edge within the suction opening or simply result from the edge at the transition/mouth area of the suction opening on the inside of the thick matter collection container.

In a further embodiment it is provided that the stop is accommodated in a recess, in particular a groove, of the cylinder housing and can preferably be removed from the delivery cylinder. The stop is a separate component from the cylinder housing, which is used to produce the positive connection in the Recess of the cylinder housing can be used. This simplifies the assembly and maintenance of the delivery cylinder of the device according to the invention.

In a further embodiment it is provided that the stop is firmly connected, in particular screwed, to the housing of the thick matter collecting container. This connection is in particular the previously mentioned "further connection" which transmits the pressure forces occurring during the conveyance to the housing of the thick matter collecting container. By screwing the stop, a space-saving and protected screw connection can be implemented. In particular, the screws are countersunk in a corresponding recess so that they do not protrude from the housing.

In a further embodiment, it is provided that the stop is designed as an insert ring, which is arranged inside the suction opening and is accommodated in a groove that runs at least partially around the cylinder housing, with an edge that runs at least partially surrounding the cylinder housing being designed as a counter-stop, which is connected to the Stop forms a form fit. The insert ring is easy to mount or replace if necessary.

In a further embodiment it is provided that the insert ring is firmly connected, in particular screwed, to the counter-stop. Alternatively or additionally, it can be provided that the delivery cylinder is held in the suction opening by a component mounted on the inside of the thick matter collecting container, in particular a wearing plate with an opening covering the suction opening. In the latter case, the wear plate can serve as a stop, which is screwed to the inside of the housing of the sludge collector.

In a further embodiment, it is provided that the intake opening is designed in such a way that the insert ring can be inserted into the intake opening from the inside of the thick matter collection container for mounting on the cylinder housing. For assembly, the delivery cylinder is pushed into the intake opening from the outside and from the inside of the thick matter collection tank by inserting the insert ring secured. Then, depending on the design of the further connection, for example the insert ring is screwed to the housing of the thick matter collection container at specially provided points or the wearing plate, which fixes the delivery cylinder in the suction opening, is screwed on so that the delivery cylinder is secured against slipping through into the interior.

In a further embodiment it is provided that a wearing plate with an opening covering the suction opening is mounted on the inside of the thick matter collecting container, the delivery cylinder reaching through the suction opening to the wearing plate. As a result, the material to be conveyed can pass from the conveying cylinder directly through the wearing plate into the conveying line or a diverter valve that is preferably provided without interfering edges or a throttling effect.

In a further embodiment, it is provided that two delivery cylinders are provided, the movement sequences of which are synchronized with one another during the delivery of thick matter such that when one delivery cylinder is pumped, the other delivery cylinder performs a suction stroke. A corresponding suction opening is provided for each delivery cylinder. As described above, each of the delivery cylinders is fastened to the thick matter collection container via a form-fitting connection for introducing the tensile forces and a further connection for introducing the compressive forces. By dispensing with projecting flange connections on the outside of the thick matter collection tank, for example, two delivery cylinders working in push-pull can be arranged directly next to each other to save space. Designs with more than two delivery cylinders are also conceivable.

The linear delivery cylinders are preferably driven hydraulically, in particular via drive cylinders connected to the axially movable delivery pistons of the delivery cylinders, and can each have one or a common water tank. The thick matter collection container is, in particular, a feed or feed hopper. This can have an agitator to improve the flow of the conveyed material.

In a further embodiment, it is provided that a hydraulically driven transfer tube is provided in the thick matter collection container, one end of which is permanently connected to the delivery line and the other end of which can be moved back and forth between the suction openings in such a way that the delivery cylinder performing a pumping stroke with is connected to the delivery line, while the delivery cylinder executing the suction stroke is connected to the interior of the thick matter collecting container. The transfer tube, which is in particular an S-tube, can be driven by one or more hydraulic swivel cylinders.

The fastening according to the invention of the at least one delivery cylinder via a form-fit connection and a further connection can also be provided for fastening the delivery cylinder to a water tank. The water box can be located at an end of the at least one delivery cylinder that is opposite the thick matter collection container. The water box can be used for cooling, lubrication and/or cleaning. Preferably, a piston rod of the delivery cylinder is guided through the water tank, with a cylinder housing likewise being able to be located on the other side of the water tank (quasi as a continuation of the cylinder housing connected to the thick matter collecting container). Access to the interior of the delivery cylinder or to the piston rod is thus obtained in particular via the water tank.

The connection of the at least one delivery cylinder to the water tank can be designed according to one or more of the embodiments described above. The previous statements therefore apply analogously to the possible connection to the water box.

Figur 1:

einen Längsschnitt durch einen Förderzylinder und dessen Befestigung am Dickstoffsammelbehälter gemäß einem bevorzugten Ausführungsbeispiel der erfindungsgemäßen Dickstofffördervorrichtung in einer Seitenansicht; und

Figur 2:

eine vergrößerte Ansicht der Befestigung des Förderzylinders am Dickstoffsam melbehälter.

Further features, details and advantages of the invention result from the exemplary embodiment explained below with reference to the figures. Show it:

Figure 1:

a longitudinal section through a conveyor cylinder and its attachment to the thick matter collecting container according to a preferred embodiment of the thick matter conveying device according to the invention in a side view; and

Figure 2:

an enlarged view of the attachment of the delivery cylinder on the thick matter collection tank.

The figure 1 shows a side view of a section through a delivery cylinder 12 of a preferred exemplary embodiment of the thick matter delivery device 10 according to the invention. The latter is in particular a concrete pump with two linear delivery cylinders 12 arranged in parallel, which alternately carry out pumping and suction strokes in push-pull and concrete from a thick matter collection container 18, in particular feed hopper 18, pump into a delivery line, not shown here. A hydraulically driven diverter valve (not shown) designed as an S-pipe is permanently connected to the delivery line and is pivoted back and forth between the suction openings 22 formed in the housing 20 of the thick matter collection container 18 such that the delivery cylinder 12 executing the pumping stroke always passes over the transfer tube is connected to the delivery line and concrete is pumped into the delivery line via the associated suction opening 22, while the other delivery cylinder 12 just executing the suction stroke sucks in concrete from the thick matter collecting container 18 via the associated suction opening 22.

The figure 2 shows the in the figure 1 attachment area of the delivery cylinder 12 indicated as circle A in an enlarged view. In the present case, the term "delivery cylinder" is used for the entire piston-cylinder unit. The delivery cylinders 12 include a cylinder housing 14 (which could also be referred to as a cylinder tube 14) and have a cylinder opening 16 at the end facing the thick matter collection container 18, which is connected to the interior of the thick matter collection container 18 via the suction opening 22. The feed cylinder 12 are attached to the housing 20 of the sludge collector 18, which in the figure 1 is only partially shown.

In the figure 1 only one of the delivery cylinders 12 is shown, the components arranged within the cylinder housing 14, such as delivery pistons and piston rods, being hidden for the sake of better clarity. At the opposite end of the cylinder opening 16 of the delivery cylinder 12, a water tank 13 is screwed, which serves in particular for cooling, lubrication and cleaning. The delivery cylinders 12 are driven in particular by hydraulic drive cylinders (not shown), which are connected to the delivery piston of the associated delivery cylinder 12 via a piston rod that is guided through the water tank 13 .

Strong forces occur during conveying operation. On the one hand, strong outward tensile forces act on the housing 20 of the thick matter collection container 18 (and on the water tank 13), while pressure forces acting in the opposite direction (ie inward towards the interior of the thick matter collection container 18) are lower. In order to provide a space-saving solution that is optimally adapted to this circumstance, the present invention provides for the delivery cylinder 12 (in the following only one delivery cylinder 12 will be referred to - but the statements obviously apply to all delivery cylinders 12 provided for the thick matter delivery device 10) on the housing in this way 20 of the thick matter collection container 18 so that the strong tensile forces and the weaker compressive forces are introduced into the housing 20 via separate paths, i.e. via different connections 30, 32.

For this purpose, the delivery cylinder 12 is positively connected to the housing 20 in the direction of the acting tensile forces, while a screw connection 32 is provided for the transmission of the compressive forces acting in the opposite direction. The form fit 30 is generated by an insert ring 24 inserted into a circumferential groove 28 provided in the cylinder housing 14 and resting against a circumferential edge 26 formed inside the intake opening 22, which thus forms a counter-stop. For this purpose, the cylinder housing 14 is connected through the intake opening 22 led and held in this. The edge 26 is realized in that the intake opening 22 is enlarged towards the inside 19 of the thick matter collection container 18 , ie a circumferential recess 27 adjoining the intake opening 22 is provided in the housing 20 on the inside 19 .

The insert ring 24 is screwed to the edge 26 forming the counter-stop via a screw connection 32 formed by a plurality of screws 33 distributed around the circumference (or via a flange with screws 33). The lengths of the screws 33 are dimensioned in such a way that they are countersunk in the recess 27 and therefore do not protrude into the interior of the thick matter collection container 18 . This makes it possible to attach a wear plate (not shown) for the S-tube to the inside 19 which covers the screw connection 32 . The fastening according to the invention makes it possible to place the feed cylinder 12 completely in the suction opening 22 and to bring it up to the wear plate. As a result, the concrete can be pumped directly from the delivery cylinder 12 via the wearing plate into the S-tube without any protruding edges or a throttling effect. Due to the form fit in the main load direction (tensile forces), the screws 33 are subjected to significantly less stress.

Like in the figure 2 can be seen, the diameter of the suction opening 22 tapers slightly from the outside to the insert ring 24 . The thickness of the cylinder housing 14 is correspondingly slightly reduced in steps and has two circumferential seals 23 on the outside in order to seal off the interior of the thick matter collection container 18 from the outside.

To assemble the delivery cylinder 12, the cylinder housing 14 is pushed into the suction opening 22. The insert ring 24 is pushed from the inside 19 over the end of the cylinder housing 14 on the inside side, which is made possible by the circumferential recess 27 . The insert ring 24 is placed in the groove 24 so that it rests against the edge 26 and positively blocks displacement of the delivery cylinder 12 in the direction of the outside. By screwing the insert ring 24 to the edge 26 by means of the screws 33, the insert ring 24 is fixed in the recess 27 and the feed cylinder 12 is thus fastened. Now he can't either be moved more towards the inside 19. Now the wear plate or the wear plate can be mounted. Replacing the insert ring 24 or the feed cylinder 12 is just as easy.

A corresponding combination of positive locking and screw connection can also be provided on the water tank 13 . As an alternative to a circumferential insert ring 24, a plurality of individual stops which engage in corresponding recesses in the cylinder housing 14 can also be provided. For this purpose, there can be several individual cutouts 27 with respective counter-stops 26, if necessary. However, with a single insert ring 24, assembly is particularly simple. Furthermore, instead of the connection 32 by means of the countersunk screws 33, the wear plate screwed to the inside 19 in any case can be used to produce the further connection 32.

Reference list:

10

sludge conveyor

12

delivery cylinder

13

water box

14

cylinder body

16

cylinder opening

18

sludge collection tank

19

inside

20

Housing

22

intake port

23

poetry

24

stop

26

counterattack

27

recess

28

recess (groove)

30

Positive-locking connection

32

More connection

33

screw

Claims (15)

1. Thick matter delivery device (10), in particular for delivering concrete, comprising a delivery cylinder (12) by means of which thick matter can be delivered from a thick matter collecting container (18) into a delivery line,
   characterised in that
   the delivery cylinder (12) is fastened to the thick matter collecting container (18) in such a way that tensile forces of the delivery cylinder (12) acting during the thick matter delivery are transferred to the thick matter collecting container (18) via a form-fitting connection (30), and opposingly acting compressive forces are transferred thereto via a further connection (32).
2. Thick matter delivery device (10) according to claim 1, characterised in that the further connection (32) is a screw connection, bolted connection, or a form-fitting connection via a locking ring, and is preferably not provided on an outer side of the thick matter collecting container (18).
3. Thick matter delivery device (10) according to either claim 1 or claim 2, characterised in that the delivery cylinder (12) comprises a cylinder housing (14) having a cylinder opening (16) which is connected to a suction opening (22) formed in a housing (20) of the thick matter collecting container (18), wherein the form-fitting connection (30) is preferably located in or at the suction opening (22).
4. Thick matter delivery device (10) according to claim 3, characterised in that the cylinder housing (14) is received in the suction opening (22), at least in part.
5. Thick matter delivery device (10) according to any of the preceding claims, characterised in that the delivery cylinder (12) is connected to a housing (20) of the thick matter collecting container (18) in a form-fitting manner by means of a stop (24).
6. Thick matter delivery device (10) according to claim 5, characterised in that a counter-stop (26) is provided on the housing (20) of the thick matter collecting container (18), which counter-stop interacts with the stop (24) in order to block a movement of the delivery cylinder (12) away from the suction opening (22) by means of form-fitting, wherein the counter-stop (26) is preferably formed inside the suction opening (22) or is formed by the inner side (19) of the thick matter collecting container (18).
7. Thick matter delivery device (10) according to either claim 5 or claim 6, characterised in that the stop (24) is received in a recess (28), in particular groove, of the cylinder housing (14), and is preferably removable from the delivery cylinder (12).
8. Thick matter delivery device (10) according to any of claims 5 to 7, characterised in that the stop (24) is rigidly connected, in particular screwed, to the housing (20) of the thick matter collecting container (18).
9. Thick matter delivery device (10) according to any of claims 5 to 8, characterised in that the stop (24) is designed as an insert ring, which is arranged inside the suction opening (22) and is received in a groove (28) which at least partially surrounds the cylinder housing (14), wherein an at least partially surrounding edge (26) is formed in the suction opening (22), as the counter-stop, which forms a form-fitting connection together with the stop (24).
10. Thick matter delivery device (10) according to claim 9, characterised in that the insert ring (24) is rigidly connected, in particular screwed, to the counter-stop (26), or in that the delivery cylinder (12) is held in the suction opening (22) by means of a component which is mounted to the inner side (19) of the thick matter collecting container (18), in particular a wear plate having an opening that covers the suction opening (22).
11. Thick matter delivery device (10) according to either claim 9 or claim 10, characterised in that the suction opening (22) is designed such that the insert ring (24) can be introduced into the suction opening (22) from the inner side (19) of the thick matter collecting container (18), for the purpose of mounting on the cylinder housing (14).
12. Thick matter delivery device (10) according to any of claims 3 to 11, characterised in that a wear plate having an opening that covers the suction opening (22) is mounted on the inner side (19) of the thick matter collecting container (18), wherein the delivery cylinder (12) reaches through the suction opening (22) as far as the wear plate.
13. Thick matter delivery device according to any of the preceding claims, characterised in that two delivery cylinders (12) are provided, the movement sequences of which are synchronised with one another during the thick matter delivery, in such a way that when one delivery cylinder (12) is pumped, the other delivery cylinder (12) performs a suction stroke.
14. Thick matter delivery device (10) according to claim 13, characterised in that an in particular hydraulically driven pipe switch is provided in the thick matter collecting container (18), which switch is permanently connected at one end to the delivery line, and the other end of which is movable back and forth between the suction openings (22) in such a way that the delivery cylinder (12) performing a pumping stroke in each case is connected to the delivery line, while the delivery cylinder (12) performing the suction stroke is connected to the interior of the thick matter collecting container (18).
15. Thick matter delivery device (10) according to any of the preceding claims, characterised in that the at least one delivery cylinder (12) is connected to a cistern (13) in such a way that tensile forces of the delivery cylinder (12) acting during the thick matter delivery are transferred to the cistern (13) via a form-fitting connection, and opposingly acting compressive forces are transferred thereto via a further connection, wherein the further connection is preferably a screw connection, bolted connection, or a form-fitting connection via a locking ring, and is further preferably not provided on an outer side of the cistern (13).

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