WO2007147586A1

WO2007147586A1 - Two-cylinder slurry pump comprising two distribution tubes

Info

Publication number: WO2007147586A1
Application number: PCT/EP2007/005447
Authority: WO
Inventors: Reinhold Erner; Volker Beissner
Original assignee: Schwing Gmbh
Priority date: 2006-06-20
Filing date: 2007-06-20
Publication date: 2007-12-27
Also published as: DE102006028329A1

Abstract

Disclosed is a two-cylinder slurry pump, especially for conveying concrete, comprising a first (A) and a second (B) conveying cylinder which extend into a prefilling container (3), and two pivotable distribution tubes (8a, 8b) that are preferably bent in an S-shaped manner, are disposed in the prefilling container (3), and cyclically connect one respective conveying cylinder (A, B) to one respective conveying pipe. Each of the two distribution tubes (8a, 8b) has an end facing a cylinder and an end facing the conveying pipe while being provided with a kidney-shaped face (14) at the end facing the conveying pipe, said kidney-shaped face (14) encompassing an integrated blocking area (15) and a nearly circular outlet cross-section.

Description

Two-cylinder thick matter pump with two diverter valves

The invention relates to a two-cylinder slurry pump according to the preamble of claim 1.

In order to be able to convey thick materials, for example concrete, over height and length differences, so-called piping systems are used which are fastened, for example, to a mast boom. Such mast booms are stationary or mounted for mobile use on trucks, rail vehicles and ships. In order to be able to convey the thick matter through the piping system, corresponding pumping devices, so-called thick matter feed pumps, are required. Such pumping devices are well known in the prior art.

According to a common design, such a thick matter feed pump comprises at least one delivery cylinder, which sucks the thick matter, for example, from a storage container in the suction stroke and virtually presses the absorbed thick material into the pipeline system in the opposite delivery stroke. For this purpose, the delivery cylinder must be alternately connected to the reservoir and the delivery line system, for which appropriate switches are used. Known turnout systems are flat slide, poppet valves and diverter valves (also referred to as swivel tubes) in different configurations. In order to maintain an approximately continuous production operation, the sludge pumps of the type described above generally have two delivery cylinders, which suck in the thick matter in push-pull and eject into the delivery line system. Such two-cylinder thick matter pumps are now operated almost exclusively with pipe softening systems.

Such a two-cylinder sludge pump with diverter shows, for example, the generic patent DE 29 09 964 C2. The thick matter pump described therein has a filling container, attach to the two delivery cylinders and sucked in push-pull thick matter from this. In the delivery stroke, the two delivery cylinders are each connected by means of a diverter valve with the delivery line system, wherein the two diverter valves are arranged within the filling container and pivotally attached to the container wall with their delivery line ends.

Such two-cylinder thick matter pumps with two diverter valves have been increasingly replaced in recent years by the advanced systems with only one diverter valve. These have the advantage of a lower overall weight, but also a reduced production engineering and control engineering effort. Such two-cylinder thick matter pumps are described, for example, in the patents DE-OS 29 03 749 and DE 26 11 944 A.

With regard to the pipe turnouts, various designs are known from the prior art. Thus, the S-tubes (see DE 29 09 964 C2) are used in the prior art primarily for pump systems with two diverters. Only in the case of pump systems with only one diverter valve are the delta scrapers (see DE 41 23 075 A1) and the fan or rocker pusher (compare US 3,663,129) also known. With regard to the last-mentioned fan or rocker slide, various embodiments are again known from the prior art.

Even with the advanced two-cylinder thick matter pump with only one pipe switch this is also pivotally mounted at one end, preferably with its delivery line side end at the flange to the outgoing delivery line. For mounting purpose-developed pivot bearings are used with appropriate seals. However, such a fastening of the tube switches has the problem that it comes as a result of the pivoting movement, which takes place for example via a hydraulically confirmed lever mechanism, to an extremely high Biegemoment- and / or torsional load on the pivot bearing, which also high wear of the seals with it so that they have to be replaced frequently, which of course causes costs.

Another disadvantage, in particular the further developed two-cylinder thick matter pumps with only one pipe switch, is a, by switching the pipe switch between the delivery cylinders conditional, pulsating and thus discontinuous flow. Recently, there has been increased efforts to operate a two-cylinder slurry pump continuously. In this regard, various inventions have become known, for example, with the patents DE 29 33 128 C2, GB 1,063,020, DE 195 03 986 Al and DE 101 09 516 Al. The approaches proposed herein are essentially aimed at adapting the stroke movement of the delivery pistons in the delivery cylinders or to modified diverter systems, whereby even with these systems a satisfactory delivery rate can not yet be achieved.

The invention is therefore based on the object to provide a two-cylinder slurry pump which produces a more continuous flow and which is also suitable for mass production.

This object is achieved by a two-cylinder slurry pump according to the features of claim 1. The dependent claims relate to advantageous developments.

According to claim 1, it is provided that the two diverters each have kidney-shaped end faces at their ends on the delivery line side, with blocking surfaces and exit cross sections integrated therein. With these restricted areas can be close the corresponding pressure opening in the wall of Vorfüllbehälters to the pipe system out with only a small swing stroke of the pipe switch, or vice versa reopen. Due to the low swing stroke very short switching times and very precise switching operations are possible. The respective integrated blocking surface allows a reliable, low-wear and thus low-maintenance closure possibility for the pressure openings, resulting in a robust and suitable for continuous operation construction of erf Dickndungsgemäßen sludge pump. Such kidney-shaped end faces with integrated blocking surfaces are already known in a similar design, the use of such a technology for a thick matter pump of the type according to the invention not previously considered by experts and synergetic effects remained unexplored.

The term kidney-shaped (or kidney bean-shaped) in the sense of the patent application refers to the outer contour of a cross-sectional area (relative to a vertical section) or an end face of the tube diverters.

Another advantage of the invention is that the two pipe switches are independently operable. Due to the individual control option for both diverter valves, it is possible for one of the two delivery cylinders to begin their delivery stroke before the other cylinder has finished its delivery stroke (so-called stroke overlay), so that both delivery cylinders together promote the thick material into the delivery line system, at least for a brief moment and thus, despite completion of the delivery stroke of the other cylinder, a nearly continuous, d. H. pullsationsfreier and uninterrupted flow rate is maintained.

Another advantage is the fact that the two individual pipe switches considered in each case have a significantly lower vibration mass, which causes less severe vibrations and which is also easier to handle control technology. In addition, the switching process designed so much more sensitive. In an advantageous embodiment, the diverters are fan-shaped or rock-shaped, ie, their cross-sectional areas increase more or less continuously from the cylinder-side end to the delivery-line end. This ensures that the diverters, despite their large kidney-shaped end faces at the delivery line ends, not disproportionate space, eg. In Vorfüllbehälter take. In addition, weight is saved.

In a further preferred embodiment, the two diverters are rigidly arranged on each of a shaft, wherein these two waves extend through the Vorfüllbehälter and are preferably also mounted on this. During pivoting of the pipe switches arranged on the shafts, both ends of the pipe switches are thus moved translationally to the inlet or outlet openings of the prefilling container. This has the advantage that it is possible to dispense with the hitherto customary mounting of a pipe switch by means of a rotatable flange connection (for example, at the delivery line end of the pipe switch). This also eliminates the critical bending and torsional moments occurring during this storage, which especially put extreme stress on the seals of the flange connection. Another advantage of this embodiment is that the actuation forces required for pivoting are no longer directly introduced into the diverter valves, as is conventional in the past, for example by a lever of the pivoting mechanism acting directly on the diverter, but only indirectly via the shafts. This results in significantly lower loads for the diverter valves which also lead to significantly lower deformations derselbigen, which especially increases the life of the face seals (so-called. Cutting rings).

In an advantageous embodiment, the diverters and the shafts are made as separate parts and mounted to each other, to which the diverters have at least two and preferably exactly two steering arms. The steering arms are preferably formed integrally with the pivot tubes, but may also be provided as separate parts. It is also possible to integrate the pivot arms in the tube switches, without departing from the basic idea of the Schwenkarmprinzips. The attachment of the pivot arms to the waves is done by a positive connection such as a wedge connection, on the forces and moments can be transferred very well and a connection maintaining the screw. Of course, other suitable fastening devices may be provided, such as. Welded connections. Also, a one-piece design of the waves with the pivot arms is possible, as well as the shaft, steering arms and pipe switch comprehensive integral training.

In a particularly preferred development, the steering levers of the diverters have different lengths. It is provided here that the shorter steering lever is arranged at the delivery line end and the longer steering lever is arranged at the cylinder-side end of a transfer tube. This results in a particularly advantageous torque compensation. The ends which move in translation relative to the wall of the prefilling container during pivoting of the transfer tube, ie the delivery-side and the cylinder-side end surfaces (in fact the cutting rings arranged thereon), cause frictional forces. Here, the resulting frictional force at the delivery line end due to the larger contact surface (due to the kidney shape) is greater than at the cylinder-side end with the smaller contact surface. These differently sized frictional forces would relative to the pivot axis, ie the shaft, with equal lengths of the steering lever, ie at the same lever arms, generate different sized friction or braking moments, causing a resulting tilting moment for the pipe switch. This tilting moment would, as already known from other applications, extremely stress the seals or cutting rings at least occasionally. According to the invention, it is therefore provided that the shorter steering lever and thus the shorter lever arm and the smaller cylinder-side end of the longer steering lever with the longer lever arm is arranged on the larger friction surface, ie on the kidney-shaped conveying line end of the pipe switch, so that the moment effect as a result of the resulting Frictional forces at both ends of the pipe switch is about the same and thus no tilting moment is caused (so-called torque compensation). This advantageously leads to an improved sealing effect and to a lower load on the cutting rings and thus also to a longer service life, combined with lower maintenance and operating costs. In a further preferred embodiment, it is provided that the two shafts are arranged approximately and in particular exactly parallel to the space. This also includes deviations of the space-parallel arrangement, which arise due to production or inevitably by design. Further, the shafts are supported on a respective front end wall and a rear end wall of the prefill container so as to extend therethrough. Advantageously, thus the bearing seats of the waves can be very well finished and reworked.

In a preferred development, the prefill container has at its rear end wall two approximately circular inlet openings, through which the delivery cylinders open into the prefill container, and which are also referred to as suction openings. An opposite front end wall likewise has two approximately circular so-called outlet openings, on which the two outgoing delivery lines begin, which are also referred to as pressure openings. According to the invention, it is provided that the suction openings and the opposite pressure openings, based on a surface normal of the front or the rear end wall, are not arranged in alignment, whereby more or less curved diverters must be used, which in turn create sufficient space during pivoting, so the thicker better can reach the suction in the Vorfüllbehälter usually arranged at a lower point. Furthermore, the diverters extending obliquely or curvedly through the prefilling container contribute to a type of permanent mixing or stirring and distribution of the thick material contained in the prefilling container.

The method for operating such a two-cylinder thick matter pump provides that the two diverters are mechanically driven or actuated independently of each other in order to connect a respective delivery cylinder with one conveyor line intermittently (or temporarily).

In this case, it is preferably provided that the conveying operation takes place in the delivery cylinders without precompression, as hitherto mostly usual. In the method is further provided that each one of the two delivery cylinder begins its delivery stroke before the other cylinder has finished its delivery stroke (so-called Hubüberlagerung), whereby the corresponding diverter valve is brought into a Förderbetriebsstellung so that both delivery cylinders together at least temporarily convey the thick matter into the delivery line system. This has the advantage that, despite the completion of the delivery stroke of the other cylinder, a continuous thick matter delivery flow is maintained in the outgoing delivery line system, which is interruption-free and largely pulsation-free. However, this assumes that the two delivery cylinders can be operated with stroke overlay.

According to the invention, it is furthermore provided that the movement of the delivery pistons in the delivery cylinders with each other and preferably also the movement of the diverter valves is coordinated with one another and in particular also with respect to the delivery pistons, for which purpose suitable regulating, control or signaling devices (eg, buttons) are provided.

The application of force to the lever or connecting rod mechanism for the rotational drive of the shafts is advantageously carried out by hydraulic, in particular double-acting, actuating cylinders.

Further advantages will be described in connection with the embodiment shown in the figures. Herein show:

1 shows a two-cylinder concrete pump according to the invention in a perspective view.

2a a diverter valve of the two-cylinder

Concrete pump according to Figure 1 in a perspective view overlooking the delivery line side end;

2b shows the diverter valve of Figure 2a in a perspective view overlooking the cylinder-side end ..; FIG. 3a shows the control system of the two-cylinder concrete pump according to FIG. 1 in a front view, wherein the diverters are in a first position; FIG. FIG. 3b shows the control system of the two-cylinder concrete pump according to FIG. 1 in a front view, wherein the diverters are in a second position; FIG. FIG. 3c shows the control system of the two-cylinder concrete pump according to FIG. 1 in a front view, wherein the diverters are in a third position; FIG. FIG. 4a shows the control system of the two-cylinder concrete pump according to FIG. 1 in a plan view, wherein the diverter valves according to FIG. 3a are in a first position; FIG. FIG. 4b shows the control system of the two-cylinder concrete pump according to FIG. 1 in a plan view, wherein the diverters according to FIG. 3b are in a second position; FIG. FIG. 4c shows the control system of the two-cylinder concrete pump according to FIG. 1 in a plan view, wherein the diverter valves according to FIG. 3c are in a third position; FIG.

Fig. 1 shows a generally designated 1 two-cylinder concrete pump in a perspective view. However, a pump of this type can also be used to promote other thick matter or pasty substances. The concrete pump 1 comprises a control system, generally designated 2, which is arranged substantially in a housing 3 designed as a prefill container. The housing comprises a front and a rear end wall 4 and 5 and is open to the concrete receptacle upwards. At the rear end wall 5 set the two delivery cylinders A and B, the cylinder chambers by appropriate Eingangsbzw. Suction openings 6a and 6b open into the prefilling container 3. At the junctions between the delivery cylinders A and B and the rear end wall 5 elastic annular spacers are provided for sealing and vibration decoupling (see reference numeral 12 in Figs. 3a, 3c and 4a). On the front end wall 4, two outlet or pressure openings 7a and 7b are arranged. Frame and attachments of the concrete pump, especially valves and other components of the hydraulic control, are not shown for reasons of clarity.

In the Vorfüllbehälter 3 belonging to the control system 2 diverters 8a and 8b, attached to each of a shaft 9a and 9b, pivotally mounted. The pivoting of the diverter 8a and 8b is carried out by rotating the shafts 9a and 9b, which are rotatably driven in each case via a connecting rod 10a and 10b, wherein the application of force by appropriate actuating cylinder and in the concrete case by double-acting hydraulic cylinder II a and Ib I he follows. The two diverters 8a and 8b can thus be switched or actuated independently of each other.

The two diverters 8a and 8b are mirror-symmetrical, but this need not necessarily be the case. As can be seen in particular from FIGS. 2 a and 2 b, which show the diverters in a perspective view, the diverters 8 a and 8 b are double-cranked and thus quasi S-shaped along the course of the current. Furthermore, the diverters 8a and 8b are fan-shaped, ie they have along the flow path, ie from their cylinder-side ends toward the delivery line ends, increasing cross-sectional areas, which is why they are also referred to as fan shifter. At the cylinder-side ends, each of the two diverter valves 8a and 8b has approximately circular end faces with approximately circular inlet cross-sections 13 (see Fig. 2b), the latter being substantially adapted to the suction opening 6a or 6b in the rear end wall 5 , On the opposite sides, that is to say at the delivery line-side ends of the diverters 8a and 8b, these are formed with kidney-shaped end faces, these being subdivided into a blocking surface 15 and an outlet cross section 16 (see FIG. The outlet cross sections 16 are in turn approximately circular in shape and are substantially adapted to the corresponding pressure openings 7a and 7b of the front end wall 4. The diverters 8a and 8b have arranged at their end faces seals, so-called. Cutting rings. The arranged at the delivery line ends of the diverter 8a and 8b cutting rings 17 are kidney-shaped and, as can be seen from Fig. 2a, secured in correspondingly prepared grooves 18. At the cylinder-side ends of the diverters, the cutting rings are substantially annular in shape and, as is apparent in particular from FIG. 2b, secured in corresponding recesses.

As is apparent from Fig. 1 and the previous explanations, the two diverters 8a and 8b between the two end faces or walls 4 and 5 inside the Vorfüllbehälters 3 (which is also referred to as a slide housing) rotatably or pivotally mounted. That the two diverters 8a and 8b can perform a pivoting movement about their respective drive shaft 9a and 9b, and thereby assume different working positions or switching positions. In the illustration of FIG. 1, the pipe switch 8a belonging to the delivery cylinder A is in the conveying operating position, whereas the transfer tube 8 belonging to the transfer tube 8b is in the suction operating position. (This will be discussed in more detail below.) As already described above, the actuation of the two diverter valves 8a and 8b is independent of each other by two separate hydraulic cylinders IIa and Ib which rotates the respective drive shaft 9a and 9b via a lever drive.

As is apparent from FIGS. 2a and 2b, the diverters 8a and 8b each have two, in this case, different, long, steering levers 20 with which they are respectively attached to the shafts 9a and 9b. For power transmission a wedge-shaped form-locking connection is provided, wherein the attachment is effected by a screw connection, for which the steering lever 20 are provided with at least one threaded hole.

FIGS. 3 a to 3 c show the prefill container 3 in a front view with a view of the front end wall 4, which is shown partially transparent. At the front end wall 4 are the two pressure ports 7a and 7b, which provide a provide binding from the interior of the prefill container 3 to two outgoing feed lines (not shown). The two outgoing delivery lines are summarized downstream by, for example, a Y- or downpipe to a single delivery line or are already designed as parts of a manifold. Good to see in Fig. 3a, the suction ports 6a and 6b on the rear end wall 5, through which the cylinder chambers of the delivery cylinders A and B are connected to the interior of Vorfüllbehälters 3, and the elastically formed, annular seals 12th

The position of the diverters 8a and 8b in FIG. 3a corresponds to that of FIG. 1. In this diverter position or switching position, the delivery cylinder A, more precisely the delivery piston in the delivery cylinder A, is in the delivery or compression stroke. In this case, the concrete contained in the cylinder space of the delivery cylinder A is forced through the suction opening 6a, the pipe switch 8a and the pressure port 7a into the outgoing delivery line. The delivery volume flow of the concrete is deflected by the S-shaped flow path of the pipe switch 8a quasi between the front and the rear end wall 4 and 5. The pressure-side outlet cross section 16 of the kidney-shaped delivery line-side end of the diverter 8a is located during the delivery stroke of the cylinder A in register with the pressure port 7a in the front end wall 4. The diverter 8a is thus therefore in the conveying mode position. On the other hand, the pipe switch 8b belonging to the delivery cylinder B is in the suction mode position. In this case, it assumes a pivotal position, in which the suction cylinder 6 b associated with the suction opening 6 b is released in the rear end wall 5, ie the delivery cylinder B is directly connected to the interior of Vorfüllbehälters 3 in which there is the concrete to be pumped. During the simultaneous intake stroke of the cylinder B this concrete sucks from the Vorfüllbehälter 3 in its cylinder chamber. At the same time closes in this pivot position, the locking surface 15 of the kidney-shaped delivery line end of the pipe switch 8b, the pressure port 7b in the front end wall 4 of the Vorfüllbehälters. As a result, a return flow or flow into the prefilling container 3 from the outgoing delivery line is avoided. Before now the delivery cylinder A has finished its delivery stroke, the diverter 8b belonging to the delivery cylinder B also pivots in the conveying position. In this case, the cutting ring arranged at the cylinder-side end of the pipe switch 8b quasi shears off the volume flow into the delivery cylinder B. After the diverter 8b has assumed the position for the conveying operation, as shown in Fig. 3b (in this case, there is also the pressure-side outlet section 16 of the diverter 8b in register with the pressure port 7b), the delivery cylinder B begins with its print or Delivery stroke, whereby the concrete contained in its cylinder chamber is pressed through the suction port 6b, the diverter 8b and the pressure port 7b into the outgoing feed line. Accordingly, when the delivery cylinder A has completed its pressure stroke, the delivery cylinder B is already in the pressure stroke, thus producing a delivery volume flow which is continuous, that is, interruption-free and pulsation-free, departing from the concrete pump.

After the delivery cylinder A has finished its delivery stroke, the associated diverter 8a pivots to the position suction mode. In this case, the blocking surface 15 of the kidney-shaped delivery line-side end of the diverter 8a is pushed in front of the pressure opening 7a and thus in turn prevents a volume return flow from the outgoing delivery line system. At the same time, the cylinder-side end of the pipe switch 8a is moved away from the suction opening 6a in the rear end wall 5, so that a direct connection of the delivery cylinder A to the interior of the prefilling container 3 is released. This position of the two diverter valves is shown in FIG. 3c. The delivery cylinder A begins now with its suction stroke, is sucked in the concrete from the interior of Vorfüllbehälters 3. The suction stroke is carried out faster than the delivery stroke of the other delivery cylinder B, so that the delivery cylinder A can already change back into the delivery stroke before the delivery cylinder B ends his delivery.

Shortly before the delivery cylinder B completes its delivery stroke, the diverter 8a pivots back into the conveying mode position and the delivery cylinder A begins its delivery stroke, so that at least for a short time both delivery cylinders A and B simultaneously pump concrete into the delivery line system. Thus it comes despite the change of the conveying conveyor cylinder not to a demolition of the flow. The further conveying and control process now follows mutatis mutandis to the previous versions.

FIGS. 4a to 4c show the control system 2 in a view from above. The positions of the diverters 8a and 8b corresponding to those of Fig. 3a to 3c, which is why reference is made to the above statements to these figures.

In Figs. 4a and 4c can be seen how is created by the pivoting of the diverters 8a and 8b in the position suction operation (8b in Fig. 4a and 8a in Fig. 4c) between this place, through which the from above into the Vorfüllbehälter 3 inflowing concrete without deflection to the suction ports 6a and 6b can reach in the rear end wall 5 of the housing. This effect is favored by the fan shape of the tube switches still. This advantageously increases the achievable degree of filling of the delivery cylinders A and B.

Advantageously, a suitable control of the delivery cylinders A and B and the diverters 8a and 8b is provided for the delivery operation of the type described above. Thus, e.g. the strokes of the pistons in the delivery cylinders A and B are matched. The adjusting movement of the two diverters 8a and 8b can thus be coordinated. Furthermore, it is advantageous if the piston movements in the delivery cylinders A and B and the adjusting movements of the diverters 8a and 8b are matched to one another. Ideally, therefore, an electrical, hydraulic or pneumatic control is provided, or combinations thereof. Further, means for detecting the piston position in the delivery cylinders A and B are provided. Likewise, it is useful, but not essential, to equip the diverters 8a and 8b with position sensors.

Claims

claims

1. two-cylinder slurry pump, in particular for the promotion of concrete, with a first (A) and a second (B) delivery cylinder, in a Vorfüll- container (3) open and two preferably S-shaped curved, pivotable diverter (8a, 8b ), which are arranged in Vorfüllbehälter (3) and each one conveying cylinder (A, B) with one conveying line intermittently connect, wherein the two diverters (8a, 8b) each have a cylinder-side and a delivery line side end, characterized in that each of the two diverter valves (8a, 8b) has a kidney-shaped end face (14) at its delivery-line end, with a blocking surface (15) integrated therein and an approximately circular outlet cross-section (16).

2. Two-cylinder slurry pump according to claim 1, characterized in that the diverters (8a, 8b) are fan-shaped, and at their delivery line side ends are kidney-shaped and formed approximately circular at their cylinder-side ends.

3. Two-cylinder sludge pump according to claim 1 or 2, characterized in that two rod-like, by the Vorfüllbehälter (3) extending, and preferably mounted on this, shafts (9a, 9b) are included, on each of which a diverter valve (8a, 8b) is arranged rigidly.

4. Two-cylinder sludge pump according to claim 3, characterized in that the diverters (8a, 8b) each have at least two steering levers (20) for attachment to the shafts (9a, 9b).

5. Two-cylinder slurry pump according to claim 4, characterized in that at least two steering levers (20) of a diverter valve (8a, 8b) have different lengths, wherein a shorter steering lever on the delivery line side and a longer steering lever at the cylinder end of a diverter valve are arranged.

6. Two-cylinder slurry pump according to claim 5, characterized in that the different lengths of the steering levers (20) are coordinated so that approximately equal torques relative to the pivot axis of the pipe switch are achieved with respect to a given on the cylinder side and on the delivery line side end of a pipe switch friction action ,

7. Two-cylinder slurry pump according to claim 4, 5 or 6, characterized in that the attachment between the steering levers and the shafts is a positive connection, in particular a splined connection, in combination with a screw connection.

8. Two-cylinder slurry pump according to one of claims 3 to 7, characterized in that the shafts (9a, 9b) are arranged in parallel and are each mounted on a front end wall (4) and rear end wall (5) of the prefilling container (3).

9. two-cylinder slurry pump according to one of the preceding claims, characterized in that the Vorfüllbehälter (3) on the rear end wall (5) has two approximately circular suction openings (6a, 6b) into which the delivery cylinder (A, B) open and at the front end wall (4) has two approximately circular pressure openings (7a, 7b) at which the two outgoing conveyor belts start with.

10. Two-cylinder sludge pump according to claim 9, characterized in that the suction openings (6a, 6b) and the pressure openings (7a, 7b) to each other, based on a surface normal of the front (4) or the rear (5) end wall, non-aligned are arranged.

1 1. Two-cylinder slurry pump according to one of the preceding claims, characterized in that two hydraulically actuable actuating cylinder (I I A, I Ib) are included, each of which by means of a connecting rod drive a shaft (9a, 9b).

12. Two-cylinder sludge pump according to one of the preceding claims, characterized in that the diverters (8a, 8b) on the end faces of their conveyor line ends kidney-shaped cutting rings (17).

13. Two-cylinder slurry pump according to one of the preceding claims, characterized in that the diverters (8a, 8b) at the end faces of their cylinder-side ends have approximately annular cutting rings.