EP0952350A1 - Pump unit for viscous materials - Google Patents

Abstract

A pump for suspensions consists of a rotational piston pump (1) with pushing members (2) connected to the hub. A mixing tool (3) is integrated with the pump outlet. The pump pref. has a radial return flow channel (10) between the inner hub and the outer rotor region. Use - The arrangement is used as a pump for suspensions, eg mortar, plaster etc. Advantage - The arrangement wear is low.

Description

The invention relates to a pump unit for thick materials, in particular for moistened mortars, plasters and concretes, which has a housing with an inlet opening and a discharge opening, a rotary piston pump being located in the housing and being assigned an outlet area in the housing.

Such rotary piston pumps are known as vane pumps from DE 44 05 333 C1 and as rotary pumps from G 88 05 078.5. The rotary piston pumps work positively with regard to pressure, delivery volume and grain size. Appropriate design measures can also ensure their use for thick materials. Thick materials can be suspensions or mixtures of heterogeneous solid and liquid components, in particular mortar, plaster, concrete or the like. and preferably be water. The publications DE-PS 680 917, DE-GM 66 09 199 and DE-OS 19 11 852 each describe a rotary piston pump for thick materials.

One problem, however, is that when conveying thick materials, in particular ordinary mortar and plaster, at least one of the components settles on the functional elements in the outlet area of a rotary piston pump, which becomes unusable after some time. The cause is the partial separation of the mortar suspension, which is also known as "bleeding". The segregation in turn has its cause in quasi-stable pressure gradients, which are caused by thick material blockages in partial areas behind the pressure chamber, in particular the compression area and in low-flow edge areas, e.g. occur behind edges in the exit area of the rotary piston pump, the exit area of the rotary piston pump generally being the space between the end area of the central pump volume and the area up to the discharge opening of the thick matter from the housing.

The invention has for its object to provide a pump unit for thick matter, which is designed in such a way that the thick matter blockages occurring in the exit area behind the pressure chamber of the rotary piston pump counteracts and thus segregation of the thick matter into its heterogeneous components can be largely avoided.

The object is achieved by the features specified in claim 1. In the pump unit for thick matter, a mixing device is contained in the housing according to the preamble of claim 1, which is arranged integrated in the outlet area of the rotary piston pump.

The rotary piston pump in the housing has a rotor, preferably with sliders engaged.

The integrated mixing device can be designed and arranged in such a way that the thick material is homogeneously and stably mixed at least in a partial area of the starting area. In particular, the homogeneously stable thick matter can be tapped from the partial area of the starting area by the mixing device, preferably by at least one associated element, and can be discharged in a homogeneously stable manner. The element can be arranged to be movable in an associated mixing volume.

The subareas in the exit area can e.g. compression areas under high pressure and / or low-flow edge areas and / or a cutting volume.

In particular, the pump volume of the rotary piston pump and the mixing volume of the mixing device can have a common cutting volume that represents the partial area, into which at least one element of the mixing device engages, not only picking up the thick matter but also clearing it out.

The mixing device can be designed as a rotating agitator, the gripping elements of which are preferably designed as an agitator.

The stirrer can regularly control or intervene in the common cutting volume from which the thick material is removed.

The speed of the stirrer of the mixing device can preferably be derived in a phase-locked manner from the speed of the rotor of the rotary piston pump.

It is therefore expedient that the drive of the mixing device and the drive of the rotary piston pump are regulated or coordinated with one another.

The two coordinated drives can preferably be connected to one another via a gear pair.

In particular, the mixing device can be incorporated in a trough-like longitudinal taper housing belonging to the housing and containing the outlet area, the stirrer axis of which can be arranged parallel to the rotor axis of the rotary piston pump.

Instead of a mixing device oriented parallel to the rotor axis, a mixing device can be arranged vertically with respect to its stirrer axis in relation to the rotor axis of the rotary piston pump in the exit area. For this purpose, in particular, a differently shaped housing, which surrounds the rotary piston pump and the mixing device, and a differently mounted drive are provided, the mixing device also having a trough-like transverse tapering housing, which belongs to the housing assigned. The respective mixing device can also be accommodated in a compact housing.

The formation of quasi-stable pressure gradients is counteracted in such a way that a forced shear stress occurs in the mixing of the thick material that remains in the exit area in such a way that segregation of the thick material components is largely avoided. This effectively prevents the build-up and finally the setting of solid particles. As a result, the pump unit according to the invention is also suitable for conveying thick materials, in particular for plasters and mortars and concretes.

The invention also opens up the possibility of conveying thick matter at high achievable pressure.

The integrated mixing device, in particular provided with mechanically moving elements, produces an adequate mixture and keeps the pump unit in a flow-optimal state with regard to the pressure-dependent "flow" of the thick matter. With one full revolution of the agitator, the stirrer sweeps over a mixing volume which can essentially correspond to a partial or the total output area of the rotary piston pump. In particular, the pump volume and the mixing volume can intersect in the outlet area of rotary piston pumps with slides in engagement with the slides for a given curved path of the slides. As a result, the pump is regularly freed of fixed solid particles with respect to the thick matter. It is expedient to bring about a phase-locked coupling of the rotation or its multiples between the rotary piston pump and the agitator by the stirrer always between two slides intervenes so that a collision with the optionally not yet fully retracted sliders can be prevented.

There is preferably a parallel arrangement of the axis of the rotor of the rotary piston pump and the axis of the stirrer with a view to maximizing the clearing volume. This also simplifies the drive of the stirrer of the agitator by using a gear pair via the drive of the rotor of the rotary piston pump.

In order to feed the liquid back to the process, in particular in the compression area, which can be identified as a partial area, a return flow channel is provided between the inner rotor area and the outer area of the rotor, preferably the suction inlet area of the rotary piston pump.

The following illustration of the return flow channel relates in particular to rotary piston pumps with sliders engaged, but may also be present in a variable manner in rotary piston pumps with differently designed rotors. The return flow channel can be designed as a radially directed cutout between the inner rotor area and the area of the inlet opening and in particular between the cam disc and the rotor facing the end.

This enables a partial backflow from the exit area via the inner rotor area or the inner stroke area into the inlet opening area, which - in order to guarantee the full freedom of movement of the individual sliders, which is controlled by a cam disk - prevents solid particles from becoming stuck, particularly in the inner stroke area. The return flow channel optionally has a relative movement towards the rotor so that the associated shear forces have a self-cleaning effect. The return flow channel preferably has a cross section of this type, which only the fine grain of the sieve line of the solid fraction can pass through, so that the coarse grains of the thick matter are essentially prevented in the pressure-free idle state of the rotary piston pump. Optionally, the rotor is provided with a hollow rotor area to form a simply coherent volume in the inner stroke area of all slides, which supports the mixing of the thick material and thus also counteracts segregation and consequently the solid particles from sticking.

The diametrically opposed slides each preferably have a resiliently flexible connection in order to avoid a slide, when materials from the solid component portion in the end region of the sieve grain line are present, in particular with individual coarse grains with a larger grain diameter, when the inlet opening area enters the pressure chamber without high material stress enable. Evasion of the coarse grain itself is supported by an optional axial bevel of the stator lining fastened to the housing inner wall, which is formed at the transition in the entrance area in the forward rotation direction, the hard metal stator lining preferably lining the entire radial area of the pressure chamber.

Instead of the mixing device designed as an agitator, a mixing device can be arranged in the outlet area of the rotary piston pump, which is constructed on a high-frequency vibration basis and whose vibrations are based on the Avoiding the thick matter segregation in the exit area is adjustable.

The invention is explained using two exemplary embodiments with the aid of several drawings:

Fig. 1

eine erfindungsgemäße erste Pumpeneinheit in einem Achsenschnitt senkrecht zur Rotorachse der Rotationskolbenpumpe mit einer rotorachsenparallel angeordneten ersten Mischeinrichtung,

Fig. 2

einen Achsenschnitt der ersten Pumpeneinheit parallel zur Rotorachse längs der Linie A-A in Fig. 1,

Fig. 3a

eine Seitenansicht der gegenüber Fig. 1 in der Zeichenebene gedrehten rechtswandigen Kurvenscheibe der ersten Pumpeneinheit,

Fig. 3b

eine Vorderansicht der gedrehten Kurvenscheibe mit Teilschnitt im Rückströmkanalbereich nach Fig. 3a und

Fig. 4

einen Achsenschnitt der erfindungsgemäßen zweiten Pumpeneinheit senkrecht zur Rotorachse der Rotationskolbenpumpe mit einer dazu rotorachsenvertikal angeordneten zweiten Mischeinrichtung.

Show it:

Fig. 1

a first pump unit according to the invention in an axial section perpendicular to the rotor axis of the rotary piston pump with a first mixing device arranged parallel to the rotor axis,

Fig. 2

2 shows an axial section of the first pump unit parallel to the rotor axis along the line AA in FIG. 1,

Fig. 3a

1 shows a side view of the right-walled cam disc of the first pump unit, which is rotated in the plane of the drawing in relation to FIG. 1,

Fig. 3b

a front view of the rotated cam with partial section in the backflow channel area according to Fig. 3a and

Fig. 4

an axial section of the second pump unit according to the invention perpendicular to the rotor axis of the rotary piston pump with a second mixing device arranged perpendicular to the rotor axis.

In FIGS. 1 to 4, the reference symbols are retained throughout for the same parts with the same functions. To distinguish the two shown in FIGS. 1 to 4 Pump units are divided into a first and a second pump unit.

First, Figs. 1 and 2 are considered together.
1, a first pump unit 1 for thick materials, in particular for moistened mortars, plasters and concretes, has a first housing 18 with an inlet opening 27 and a discharge opening 28 provided with a discharge opening flange 19, a rotary piston pump 14 being located in the first housing 18 on the inlet side a rotor 20 with slides 23, 24, 25, 26, preferably in meshing engagement, the rotary piston pump 14 being assigned a first output region 7 in the associated first housing 18.

According to the invention, a first mixing device 3 is contained in the first housing 18, which is arranged integrated in the first output region 7 of the rotary piston pump 14.

The mixing device 3 is arranged in such a way that the thick matter can be tapped off at least from a first partial area of the first output area 7 by a first element 4 of the first mixing device 3 and can be discharged in a homogeneously stable manner, wherein the first element 4 can be arranged movably in a mixing volume 5.

The pump volume 16 of the rotary piston pump 14 and the mixing volume 5 of the mixing device 3, as shown for example in FIGS. 1 and 2, have a common first cutting volume 17 which shows the first partial area and into which the first element 4 of the first mixing device 3, the thick matter clearing out, intervening. The first partial area can thus be a compression area under high pressure.

The pump volume 16 of the first housing 18 contains, on the wall side, a stator lining 15 made of hard metal and fastened by screw connections 30, 31 and a fastened stator lining 61 for receiving a wiper 56 which separates the pressure chamber 2. The stator lining 15 is preferably formed axially obliquely in the transition 29 from the area of the input opening 27 in the forward rotation direction R. The four slides 23, 24, 25, 26 are preferably made of hard metal.

In the central area, the rotor 20 is introduced with a hard metal sheathing 32 and the four slides 23, 24, 25, 26, of which two slides, the first slider 23 and the third slider 25 as well as the second slide 24 and the fourth slide 26 diametrically opposite.

Two diametrically opposed sliders 23-25 and 24-26 each have a resiliently flexible second or first connection 35 or 13, which are preferably designed as a wire or band-shaped, optionally cranked spring.

The slides 23, 24, 25, 26 are positioned on the free end on a cam track 6, the pressure chamber 2 building up as a function of the slider position.

The first housing 18 largely envelops the first pump unit 1 according to the invention and can also be composed of several housing parts.

As a rule, the first output area 7 includes a trough-shaped one which is preferably attached to the housing 18 on the underside Housing 37, a longitudinal taper housing, which is part of the first housing 18.

In the longitudinal taper housing 37, the first mixing device 3, which is oriented parallel to the rotor axis, is introduced, which essentially consists of a first stirrer representing the first element 4, which is located on a first stirrer axis 21, and a drive, preferably in the form of a driven gearwheel located outside the housing 18 38 (Fig. 2). The first mixing device 3 is thus designed as an agitator.

The associated first stirrer 4 sweeps over the first mixing volume 5 at a full revolution and can be designed both as a curved helix, comb structure or surface and preferably made of an elastic material, e.g. Steel or rubber.

In FIG. 2, in the longitudinal section of the first pump unit 1, a right-walled cam plate 11 and a left-walled cam plate 57 are attached, which guide the slides 23, 24, 25, 26 through the pump volume 16.

As a result of a predetermined curved path 6 of the sliders 23, 24, 25, 26 there is the possibility that the pump volume 16 and the first mixing volume 5 directed parallel to the rotor axis intersect, the first mixing volume 5 being part of the first output region 7 of the rotary piston pump 14. The length of the first cutting volume 17 that is present as a designated first partial area is predetermined in the extent of the distance from the two cam disks 11, 57 that are housed perpendicular to the rotor axis 8. With the parallel arrangement of the axis 8 of the rotor 20 and the first A stirrer axis 21 can achieve a maximized clearing volume, which results from the first cutting volume 17.

It is expedient that the rotor 20 is provided with a hollow inner rotor region 12 to form a simply connected volume in the inner stroke region 22 of all the sliders 23, 24, 25, 26.

Due to the parallelism of the rotor axis 8 and the first stirrer axis 21, a gear pair 58 of the rotor-axis and the stirrer-axis gear 9 and 38 can drive the first stirrer 4. The rotor axis 8 is rotatably supported in the ball bearing 41.

The first pump unit 1 according to the invention can subsequently be connected via the fastening holes 33, 34 to the storage silos or compulsory mixer which dispenses the thick material.

In Fig. 3a, the right-hand cam 11 located perpendicular to the rotor axis 8 is shown in side view. The cam plate 11 is circular and has an arcuate concave recess 39 on the circumference, which is assigned to the first mixing device 3. An edge-side recess 40 is used to hold the cam plate 11 on the inner wall of the first housing 18, a retaining bolt (not shown) in the first housing 18 being inserted into the edge-side recess 40, as a result of which a holder is achieved. The same applies to the left-walled cam plate 57.

In FIG. 3a, the right-walled cam plate 11 has, for example, as shown in FIG. 2, an end face Return flow channel 10, which is formed between the inner stroke regions 22 of the slides 23, 24, 25, 26, in particular between the stroke curve path 59 and the outer region of the rotor 20, preferably directed toward the inlet opening 27. The return flow channel 10 is preferably designed as a radial recess in the right-walled cam plate 11.

3b shows, according to a front view of the right-hand cam plate 11, the recess 39 for the first mixing device 3 and the recess 40 for holding the cam plate 11 within the first housing 18.

In order to avoid the penetration of large grains, the return flow channel 10 has a channel depth T of preferably approximately 1.5 mm.

• Der Dickstoff wird über die Eingangsöffnung 27 eingegeben und von dem sich drehenden Rotor 20 in der Rotationskolbenpumpe 14 angesaugt. Dabei transportieren die Schieber 23,24,25,26 in Vorwärtsrotationsrichtung R (Pfeilrichtung) den Dickstoff. Der Dickstoff gelangt anschließend hochverdichtet in den ersten Ausgangsbereich 7, insbesondere in das erste Schnittvolumen 17. Druckstauungen werden durch den in das erste Schnittvolumen 17 eingreifenden ersten Rührer 4 in Abhängigkeit von Drehzahl und Anzahl der Rührelemente derart abgebaut, daß der Dickstoff homogen stabil vermischt durch das Mischvolumen 5 und den restlichen Teil des Ausgangsbereiches 7 zur Austragsöffnung 28 weitergeleitet und dort ausgetragen wird. Dabei wird der Dickstoff zur Austragsöffnung 28 heraus in eine am Austragsöffnungsflansch 19 angeschlossene Druckleitung gedrückt.

The operation of the first pump unit 1 according to the invention is explained below:

• The thick matter is entered via the inlet opening 27 and sucked in by the rotating rotor 20 in the rotary piston pump 14. The slides 23, 24, 25, 26 transport the thick material in the forward rotation direction R (arrow direction). The thick matter then reaches the first exit region 7, particularly compressed, into the first cutting volume 17. Pressure build-ups are reduced by the first stirrer 4 engaging in the first cutting volume 17 depending on the speed and number of stirring elements in such a way that the thick matter is mixed homogeneously and stably by the Mixing volume 5 and the remaining part of the exit area 7 are forwarded to the discharge opening 28 and discharged there. The thick matter is pressed out to the discharge opening 28 into a pressure line connected to the discharge opening flange 19.

4 shows a second pump unit 55 according to the invention, which has the rotary piston pump 14 with the same inlet opening 27 that can be connected to a storage silo via the fastening holes 33, 34 and the same outlet opening 28 that can be connected to pressure lines via the outlet opening flange 19 and with the same central configuration of the Rotor 20, the slide 23, 24, 25, 26, the pressure chamber 2 and the pump volume 16. Since the shape of the associated output area differs from the first output area 7, a second output area 49 of the rotary piston pump 14 is formed perpendicular to the rotor axis 8, so that an associated second mixing device 44 with its second stirrer axis 46 and a second stirrer 45 and a second drive 47 is integrated into the second output area 49. Between the pump volume 16 and the second mixing volume 36 there is also a second cutting volume 54, which represents a second partial area, into which the second stirrer 45 intervenes in a different shape and direction than in the first pump unit 1, but the highly compressed thick matter present there also cleared from the second cutting volume 54 and mixed and discharged in a homogeneously stable manner. Accordingly, there is also a second housing 42 with a different shape, the second mixing device 44 being contained in a cross-taper housing 43 belonging to the second housing 42 and being directed essentially transversely to the rotor axis 8.

The second mixing device 44 preferably contains an intermediate piece 48 which is fastened to the cross-taper housing 43 with a flange 52 on the housing side and which has the other end flange 53 with the drive 47 with the drive axis 50 parallel to the rotor axis and a right-angled one Drive bevel gear 51 holds, the drive axis 50 having a rotationally transmitting bevel gear 60 at the end.

The mode of operation of the second pump unit 55 is basically the same as that of the first pump unit 1.

At least one opening flap (not shown) can be fitted in the tapered housings 37, 43 belonging to the aforementioned mixing devices 3, 44 for the purpose of checking and carrying out cleaning and maintenance work.

In order to largely reduce the high pressure prevailing at the end of a pumping process, at least in the compression areas of the associated output areas 7, 49, at least one reverse run of the rotary piston pump 14 and associated mixing device 3, 44 can be initiated. When the pump units 1.55 are restarted, this enables homogeneous, stable, mixed thick matter to be discharged from the output areas 7.49 immediately after the start of delivery. The advantage of the immediate discharge of homogeneous thick matter at the beginning of the restart is achieved according to the invention by the integrated mixing devices 3.44.

The second pump unit 55 according to the invention has the further advantage that the vertical position of the second mixing volume 36 and thus the second stirrer 45 relative to the rotor axis 8 transfers the thick matter from the pump volume 16 into the second mixing volume 36 oriented tangentially in the forward rotation direction R (arrow direction) and segregation of the thick matter is thus largely avoided.

Reference list

1

first pump unit

2nd

Pressure room

3rd

first mixing device

4th

first stirrer

5

first mixing volume

6

Cam track

7

first exit area

8th

Rotor axis

9

rotor-axis gear

10th

Return flow channel

11

right-walled cam

12th

hollow rotor area

13

first connection

14

Rotary piston pump

15

Stator lining

16

Pump volume

17th

first cutting volume

18th

first housing

19th

Discharge opening flange

20th

rotor

21

first stirrer axis

22

Nice area

23

first slider

24th

second slide

25th

third slider

26

fourth slider

27

Entrance opening

28

Discharge opening

29

crossing

30th

first screw connection

31

second screw connection

32

Carbide sheathing

33

first mounting hole

34

second mounting hole

35

second connection

36

second mixing volume

37

Longitudinal taper housing

38

agitator gear

39

Recess

40

Recess

41

ball-bearing

42

second housing

43

Cross taper housing

44

second mixing device

45

second stirrer

46

second stirrer axis

47

second drive

48

Spacer

49

second exit area

50

Drive axle

51

Drive bevel gear

52

flange on the housing side

53

front flange

54

second cutting volume

55

second pump unit

56

Wipers

57

left-walled cam

58

Gear pairing

59

Stroke curve

60

Bevel gear

61

Stator lining

R

Forward rotation direction

T

Channel depth

Claims (23)

Pump unit for thick materials, in particular for moistened mortar, plasters and concretes, comprising a housing with an inlet opening and a discharge opening, a rotary piston pump being located in the housing and being assigned an outlet area in the housing,
characterized,
that in the housing (18; 42) a mixing device (3; 44) is contained, which is arranged integrated in the output region (7; 49) of the rotary piston pump (14). Pump unit according to claim 1,
characterized,
that the rotary piston pump (14) has a rotor (20) with sliders (23, 24, 25, 26) in meshing engagement. Pump unit according to claim 1 or 2,
characterized,
that the mixing device (3; 44) is arranged in such a way that the thick matter can be tapped at least from a partial area of the starting area (7; 49) by at least one element (4; 45) of the mixing device (3; 44) and can be discharged in a homogeneously stable manner. Pump unit according to claim 3,
characterized,
that the element (4; 45) is movably arranged in a mixing volume (5; 36). Pump unit according to at least one of claims 1 to 4,
characterized,
that the mixing device (3; 44) is designed as a rotating stirrer (4,21; 45,46), the gripping elements (4; 45) being designed as a stirrer. Pump unit according to claims 1 to 5,
characterized,
that the mixing device (3) is introduced with respect to its stirrer axis (21) parallel to the rotor axis (8) of the rotary piston pump (14) in the housing (18), in particular in an associated longitudinal taper housing (37) containing the output region (7). Pump unit according to claims 1 to 5,
characterized,
that the mixing device (44) with respect to its stirrer axis (46) is introduced vertically to the rotor axis (8) of the rotary piston pump (14) in the housing (42), in particular in an associated transverse taper housing (43) containing the output region (49). Pump unit according to claims 1 to 7,
characterized,
that the pump volume (16) of the rotary piston pump (14) and the mixing volume (5; 36) of the mixing device (3; 44) have a common cutting area (17; 54) showing the partial area, into which the stirrer (4; 45) Mixing device (3; 44), clearing out the thick material, engages. Pump unit according to claim 8,
characterized,
that the cutting volume (17; 54) is formed by a predetermined curved path (6) of the slide (23, 24, 25, 26) within the pump volume (16). Pump unit according to claim 8 or 9,
characterized,
that the stirrer (4; 45) clears the thick material from the cutting volume (17; 54) by engaging in a regulated or controlled manner in the pump volume (16). Pump unit according to claim 10,
characterized,
that the speed of the stirrer (4; 45) of Mixing device (3; 44) derives from the rotational speed of the rotor (20) of the rotary piston pump (14) in a phase-locked manner. Pump unit according to one of claims 2 to 11,
characterized,
that the drive (38,21; 47) of the mixing device (3; 44) and the drive (8,9) of the rotary piston pump (14) are matched to one another. Pump unit according to claim 12,
characterized,
that the two coordinated drives (38,21,9,8; 47) are connected to each other via a gear pair (58; 51,60). Pump unit according to at least one of claims 1 to 13,
characterized,
that at least one return flow channel (10) between the inner rotor area (12) of the rotor (20), in particular the inner stroke areas (22) of the slide valves (23, 24, 25, 26) and at least the suction area of the inlet opening (27) of the rotary piston pump (14) is formed. Pump unit according to claim 14,
characterized,
that the return flow channel (10) is a preferably radially directed recess between the inner rotor area (12) and preferably the area of the inlet opening (27) and in particular between the cam plate (11) and the rotor (20) facing the front, the return flow channel (10) has a relative movement to the rotor (20). Pump unit according to one of claims 14 or 15,
characterized,
that the cross section of the return flow channel (10) is designed such that it is only passable for fine grain portions of the sieve line of the solid component portion of the thick matter. Pump unit according to at least one of claims 2 to 16,
characterized,
that the rotor (20) has a hollow rotor region (12) close to the axis, which connects the inner stroke regions (22) of all the slides (23, 24, 25, 26) remote from the rotor axis in the manner of a simply connected volume. Pump unit according to at least one of claims 2 to 17,
characterized,
that two diametrically opposed slides (23-25; 24-26) are coupled to one another via a resiliently flexible connection (35; 13). Pump unit according to at least one of claims 1 to 18,
characterized,
that in the area of the inlet opening (27) of the rotary piston pump (14) in the forward rotation direction (R) there is a radial transition (29) of the stator lining (15) which is axially inclined. Pump unit according to at least one of claims 1 to 19,
characterized,
that the rotor (20) of the rotary piston pump (14) is provided with a hard metal casing (32). Pump unit according to at least one of claims 1 to 20,
characterized,
that the stator lining (15) of the rotary piston pump (14) is preferably made of hard metal. Pump unit according to at least one of claims 2 to 21,
characterized,
that the slider (23,24,25,26) are preferably made of hard metal. Pump unit for thick matter according to claim 1 or 2,
characterized,
that the integrated in the output area (7; 49) of the rotary piston pump (14) mixing device is constructed on a high-frequency vibration basis, the vibrations of which are adjustable to avoid the thick matter segregation in the output area (7; 49).

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