EP3315191A1 - Mixing device, in particular bulk material mixing device - Google Patents

Abstract

The invention is based on a mixing device, in particular a bulk material mixing device, with at least one mixing container (12a, 12b, 12c, 12d, 12e) which has a receiving region (14a, 14b, 14c, 14d, 14e) for receiving a mixture. with at least one mixing unit (16a; 16b; 16c; 16d; 16e) mounted on one side, which is intended for mixing the mixed material in the mixing container (12a; 12b; 12c; 12d; 12e), and with at least one lump breaking unit (18a; 18b, 18c, 18d, 18e) having at least one cutter element (20a, 20b, 20c, 20d, 20e) projecting into the mixing container (12a; 12b; 12c; 12d; 12e). It is proposed that the at least one lump breaking unit (18a; 18b; 18c; 18d; 18e) is arranged in an end region (22a; 22b; 22c; 22d; 22e) of the mixing container (12a; 12b; 12c; 12d; 12e).

Description

State of the art

The invention relates to a mixing device, in particular a bulk material mixing device.

There is already a mixing device, in particular a bulk material mixing device, with at least one mixing container, which has a receiving area for receiving a mixed material, with at least one mixing unit mounted on one side, which is intended for mixing the mixed material in the mixing container, and with at least one lump breaking unit which has at least one cutting element protruding into the mixing container has been proposed.

The object of the invention is in particular to provide a generic device with improved properties in terms of a mixing result and in terms of a maintenance comfort. The object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

Advantages of the invention

The invention is based on a mixing device, in particular a bulk material mixing device, with at least one mixing container, which has a receiving area for receiving a mixed material, with at least one mixing unit, which is provided for mixing the mixed material in the mixing container, and with at least one Lump breaking unit, which has at least one projecting into the mixing container Cutterelement.

It is proposed that the at least one lump breaking unit is arranged in an end region of the mixing container. Preferably, the Lump breaking unit at least partially disposed in an end region of the mixing container. Preferably, the cutter element protrudes into an end region of the mixing container. The mixing unit may preferably be designed to be mounted both on one side and on two sides. Preferably, at least one mixer shaft of the mixing unit is mounted on one side. The mixing unit is preferably mounted in an end wall opposite the end region in which the lump breaking unit is arranged. Various mixing devices, which appear to be appropriate to a person skilled in the art, in particular a bulk material mixing device, are conceivable, for example wave mixers, in particular double-shaft mixers. In this context, a "mixing vessel" is to be understood as meaning, in particular, a vessel in which a mixing process of the mixing device is at least partially carried out. Preferably, this is to be understood in particular as meaning a container which has a receiving area for receiving a mixed material. The mix is taken up in particular for a mixing process in the container. Particularly preferably, a mixing unit is arranged in the mixing container, which is provided for mixing the mixed material. Preferably, the mixing container has an at least substantially cylindrical basic shape. Furthermore, in this context, a "mixing unit" should be understood as meaning, in particular, a unit which is provided for mixing the mixed material in the mixing container. Various mixing units that appear appropriate to a person skilled in the art are intended for mixing the mixed material. The mixing unit preferably has at least one mixer shaft, in particular at least two mixer shafts. A "mixer shaft" is to be understood in particular as meaning a mixing element of the mixing unit, which has at least one shaft and at least one mixing means arranged on a circumference of the shaft, in particular at least one paddle. During a mixing operation, the mixer shaft is driven in particular rotationally.

Furthermore, in this context, a "lump breakage unit" is to be understood as meaning, in particular, a unit which, during operation of the mixing device, is provided for comminution of lumps formed in the mix. Preferably, this is to be understood as meaning, in particular, a unit having at least one cutter element which projects into the mixing container and is provided for direct comminution of clumps. In particular at von Bulk material formed there may be clumping, for example, due to existing or introduced moisture, which can be solved by the lump breaking unit. A "cutter element" is to be understood in this context, in particular a tool of the lump breaking unit. The cutter element preferably has at least one, in particular rotationally driven, blade, which is provided during operation for splitting clots. Preferably, the cutter element has a plurality of mutually offset, in particular rotationally driven, blades. In principle, however, another embodiment of the cutter element which appears appropriate to a person skilled in the art would also be conceivable. In this context, a "front region" is to be understood as meaning, in particular, a region of the mixing container which faces an end face of the mixing container. Preferably, this is to be understood in particular as meaning an area adjoining an end-side inner wall of the mixing container. Preferably, this is to be understood as meaning in particular, along a mixer shaft of the mixing unit, an end region of the receiving region of the mixing container. The receiving region of the mixing container preferably has a middle region and two end regions arranged on opposite sides of the central region. The areas are each separated by imaginary, perpendicular to a rotational axis of the mixer shaft of the mixer unit extending planes. Preferably, the end regions each occupy a maximum of 30%, preferably a maximum of 20% and more preferably a maximum of 10% of a volume of the receiving area of the mixing container. Particularly preferably, the mixing container has a substantially cylindrical basic shape, on whose base side the end region is arranged. By "intended" is intended to be understood in particular specially designed and / or equipped. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

In particular, an advantageous arrangement of the lump breaking unit can be achieved by the inventive design of the mixing device. In particular, an arrangement can be achieved in which the mixing unit can advantageously be made large and is only slightly affected by the lump breaking unit. It may in particular be on a central recess in the mixing unit be waived. As a result, an advantageous homogeneous mixing result can be achieved. Preferably, further, good accessibility of the lump breaking unit can be achieved. This allows an advantageously high maintenance comfort can be achieved.

Furthermore, it is proposed that the at least one mixing unit is mounted on one side. The mixing unit is preferably mounted on one side on a side opposite the end region in which the lump breaking unit is arranged. In this context, the term "cantilevered" is to be understood in particular to mean that only one side of the mixing unit is held over a bearing. Preferably, it should be understood in particular that only one end of a shaft, in particular a mixer shaft, is mounted. As a result, in particular, an arrangement can be achieved in which the mixing unit can advantageously be made large and is only slightly affected by the lump breaking unit. This allows an advantageously high maintenance comfort can be achieved.

It is also proposed that the at least one lump breaking unit is arranged in an end wall of the mixing container. In this context, an "end wall" should be understood as meaning, in particular, a wall of the mixing container which delimits an end region of the receiving region. Preferably, this is to be understood in particular as meaning an outer wall of the mixing container, which forms a base side of the mixing container that differs from a lateral surface. Depending on an orientation of the mixing container, the end wall can be aligned both vertically and horizontally. Preferably, the end wall extends substantially vertically. Preferably, an end wall should in particular be understood to mean a wall of the mixing tank that differs from a side wall. Particularly preferably, the mixing container has two end walls and a circumferential side wall, wherein the side wall can form two sides, as well as a ceiling and / or a bottom of the receiving area of the mixing container in a horizontal orientation of the mixing container. Preferably, an end wall should in particular be understood as meaning a wall of the mixing container which is cut by a rotation axis of the mixing unit, in particular a mixer shaft of the mixing unit. As a result, in particular a particularly advantageous arrangement of the lump breaking unit can be achieved. In particular, an arrangement of the lump breaking unit at one end of the receiving region of the mixing container can be achieved. This can be advantageous reliable and easy to avoid a collision between the mixing unit and the lump breaker unit. In particular, a collision between the mixing unit and the lump breaking unit can be avoided even when pulling out of the mixing unit.

Furthermore, it is proposed that the at least one mixing unit has at least one mixer shaft. Preferably, the mixer shaft extends substantially parallel to a main extension direction of the mixing container. Preferably, an axis of rotation of the mixer shaft extends substantially parallel to a main extension direction of the mixing container. Particularly preferably, an axis of rotation of the mixer shaft extends substantially parallel to a central axis of the substantially cylindrical mixing container. By "at least substantially parallel" is to be understood in this context, in particular, that an angular deviation with respect to parallel less than 30 °, preferably less than 15 ° and more preferably less than 5 °. A "main extension direction" of an object should be understood to mean, in particular, a direction which runs parallel to a longest edge of a smallest geometric cuboid which just completely encloses the object. As a result, in particular an advantageous mixing device can be provided. Preferably, in particular, a mixing device can be provided by means of which, in particular, a favorable mixing result can be achieved.

It is further proposed that an axis of rotation of the cutter element of the at least one lump breaking unit extends at least substantially parallel to a rotation axis of the at least one mixer shaft of the mixing unit. Preferably, an axis of rotation of the cutter element during operation extends parallel to the axis of rotation of the mixer shaft of the mixing unit. Preferably, the axis of rotation of the cutter element and the axis of rotation of the mixer shaft of the mixing unit are arranged offset to one another. As a result, in particular a particularly advantageous arrangement of the lump breaking unit can be achieved. It can advantageously be reliably and easily avoided a collision between the mixing unit and the lump breaking unit. In particular, a collision between the mixing unit and the lump breaking unit can be avoided even when pulling out of the mixing unit.

It is further proposed that the mixing container has in a region of an end wall a pivoting door, in which the at least one lump breaking unit is arranged. Preferably, the swinging door is arranged in the end wall. Preferably, the end wall of the mixing container is at least substantially completely formed by the swinging door. The swinging door is used in particular to make the receiving area of the mixing container accessible. This can be used, for example, for maintenance and / or cleaning purposes. Preferably, the lump breaking unit, in particular the cutter element of the lump breaking unit, is pivoted out of the receiving area of the mixing container when the swing gate is opened. As a result, in particular the lump area unit can advantageously be made easily accessible. As a result, maintenance work can advantageously be carried out simply. It can be achieved an advantageous high maintenance comfort.

It is also proposed that the at least one mixing unit has at least two mixer shafts which extend substantially parallel to one another. Preferably, the mixer shaft extend completely parallel to each other. Preferably, the mixing device is formed into a two-shaft mixer, in particular by a horizontal twin-shaft mixer. Preferably, an axis of rotation of the cutter element during operation extends parallel to the axes of rotation of the mixer shafts of the mixing unit. As a result, in particular an advantageous mixing device can be provided. In particular, an advantageously homogeneous mixing result can be achieved.

Furthermore, it is proposed that the at least one cutter element of the lump breakage unit is arranged at least partially between the at least two mixer shafts of the at least one mixing unit. Preferably, this is to be understood in particular as meaning that, viewed in a plane perpendicular to the axes of rotation of the mixer shafts, at least a portion of the cutter element of the lump breaking unit is arranged between the at least two mixer shafts of the at least one mixing unit. Preferably, this is to be understood in particular as meaning that, at least in a two-dimensional view in a plane perpendicular to the axes of rotation of the mixer shafts, there exists at least one connecting line between a point of a first mixer shaft and a point of a second mixer shaft which intersects the cutter element of the lump bender unit.

As a result, in particular an advantageous arrangement of the lump breaking unit can be achieved. In particular, an arrangement can be achieved in which the mixing unit can advantageously be made large. Preferably, in particular, an arrangement can be achieved in which both mixer waves of the lump breaker unit can perform mixing during operation. As a result, an advantageous homogeneous mixing result can be achieved.

It is further proposed that the at least one cutter element of the lump breaking unit intersect a rotation axis of the mixer shaft of the at least one mixing unit. Preferably, the at least one cutter element of the lump breaking unit intersects an axis of rotation of the mixer shaft of the at least one mixing unit in at least one operating state, in particular in at least one rotational position of the cutter element. Preferably, the mixer shaft has a recess in the region of the cutter element, so that the cutter element can cut the axis of rotation of the mixer shaft of the at least one mixing unit. Particularly preferably, a mixer shaft of the mixing unit is shortened and does not protrude to the end wall of the mixing container. An axis of rotation of the at least one cutter element of the lump breaking unit is preferably offset from the axis of rotation of the mixer shaft, the blades of the cutter element intersecting the axis of rotation of the mixer shaft in at least one operating state, in particular in at least one rotational position. As a result, in particular an advantageous arrangement of the lump breaking unit can be achieved. In particular, an advantageously compact arrangement can be achieved.

It is further proposed that the receiving region of the at least one mixing container has at least one bulge lying outside a mixing region of the at least one mixer shaft into which protrudes the at least one cutter element of the lump breaking unit. In this context, a "mixing region" is to be understood as meaning, in particular, a region of the receiving region, preferably a circular-cylindrical one, in which a direct mixing takes place through the mixer shaft. The mixing region preferably defines a range of the mixer shaft, in particular a range of the paddles of the mixer shaft. Preferably, the bulge is partially disposed between a mixing region of a first mixer shaft and a mixing region of a second mixer shaft. In this way, in particular, a particularly advantageous arrangement of the lump breaking unit can be achieved become. As a result, in particular, an advantageous arrangement of the lump breaking unit can be achieved without restricting a size of the mixing area. It can be avoided that the lump breaking unit protrudes into an actual mixing area of the at least one mixer shaft.

It is further proposed that the at least one cutter element of the lump breaking unit, viewed in a plane perpendicular to a rotation axis of the at least one cutter element, has a cutter surface whose area value is at least 2% of an area value of a wall surface of an end wall of the mixing vessel. Preferably, a proportion of Cutterwirkfläche against the wall surface is at least 2%. Preferably, the at least one cutter element of the lump breaking unit is arranged in the end wall of the mixing container. Preferably, the area value of the Cutterwirkfläche is at least 3%, preferably at least 5% and more preferably at least 10% of the area value of the wall surface of the end wall. However, the area value of the cutter surface is particularly preferably not more than 35%, preferably not more than 30% and particularly preferably not more than 25% of the area value of the wall surface of the end wall. In particular, in a small mixer, the area value of the cutter surface is preferably approximately 13% of the area value of the wall surface of the end wall. For a large mixing device, the area value of the cutter surface is preferably approximately 2% of the area value of the wall surface of the end wall. When using two cutter elements in a small mixer, the area value of the cutter surface is preferably approximately 26% of the area value of the wall surface of the end wall, while the area value of the cutter area in a large mixer having two cutter elements is preferably approximately 7% of the area value of the wall surface of the end wall. A "Cutterwirkfläche" is to be understood in this context, in particular an imaginary surface, which, considered in a plane perpendicular to a rotation axis of the at least one cutter element, is swept by the cutter element during operation of the lump breaking unit. Preferably, the surface is formed by a circular area whose radius corresponds to a radius of the cutter element. Preferably, the Cutterwirkfläche extends parallel to a main extension plane of the cutter element. A "main extension plane" of a structural unit is to be understood in particular as meaning a plane which is parallel to a largest side surface of a smallest imaginary cuboid which just completely encloses the structural unit, and in particular passes through the center of the cuboid. In this context, a "wall surface" should be understood as meaning in particular a surface of the end wall facing the receiving region of the mixing container. As a result, in particular an advantageously efficient lump breakage unit can be provided. It can be achieved an advantageous homogeneous mixing result. In particular, due to the arrangement of the lump breaking unit, an advantageously large dimensioning of the at least one cutter element of the lump breaking unit can be achieved.

Furthermore, the invention proceeds from a method for operating a mixing device. It is proposed that in at least a first method step mixing material is transported to a cutter element of at least one lump breaking unit of the mixing device by means of a mixer shaft of a mixing unit of the mixing device. For this purpose, the paddles of the mixer shaft are preferably provided in such a way that mix which is located in the mixing region of the mixer shaft is transported by means of the paddles to the cutter element of the at least one lump break unit of the mixing device. In this way it can be reliably achieved that clumps in the mix are reliably destroyed by the lump breaking unit.

Furthermore, it is proposed that in at least one further method step mixing material is transported away from the cutter element of the at least one lump breaking unit by means of a mixer shaft of the mixing unit of the mixing device. For this purpose, the paddles of the mixer shaft are preferably set in such a way that mixed material conveyed by the cutter element of the at least one lump breaking unit into the mixing region of the mixer shaft is transported away from the cutter element of the at least one lump breaker unit by means of the paddles. As a result, it can be reliably achieved that clumps in the mix are reliably destroyed by the lump breakage unit and an advantageous circulation of the mix in the mixing bowl is achieved.

The mixing device according to the invention and the method should not be limited to the application and embodiment described above. In particular, the mixing device according to the invention and the method for fulfilling a mode of operation described herein can have a number deviating from a number of individual elements, components and units mentioned herein.

drawings

Further advantages emerge from the following description of the drawing. In the drawings, five embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

eine erfindungsgemäße Mischvorrichtung mit einem Mischbehälter, mit einer einseitig gelagerten Mischeinheit und mit einer Klumpenbrecheinheit in einer schematischen Darstellung in einem Betriebszustand,

Fig. 2

die erfindungsgemäße Mischvorrichtung mit dem Mischbehälter, mit der einseitig gelagerten Mischeinheit und mit der Klumpenbrecheinheit in einer schematischen Darstellung in einem geöffneten Zustand,

Fig. 3

die erfindungsgemäße Mischvorrichtung mit dem Mischbehälter, mit der einseitig gelagerten Mischeinheit und mit der Klumpenbrecheinheit, welche ein Cutterelement aufweist, in einer schematischen Schnittdarstellung entlang der Schnittlinie III-III,

Fig. 4

die erfindungsgemäße Mischvorrichtung mit dem Mischbehälter, mit der einseitig gelagerten Mischeinheit und mit der Klumpenbrecheinheit, welche das Cutterelement aufweist, in einer schematischen Schnittdarstellung entlang der Schnittlinie IV-IV,

Fig. 5

ein schematisches Ablaufdiagramm eines Verfahrens zu einem Betrieb der Mischvorrichtung,

Fig. 6

eine alternative erfindungsgemäße Mischvorrichtung mit einem Mischbehälter, mit einer einseitig gelagerten Mischeinheit und mit einer Klumpenbrecheinheit in einer schematischen Schnittdarstellung senkrecht zu einer Drehachse der Mischeinheit,

Fig. 7

eine weitere alternative erfindungsgemäße Mischvorrichtung mit einem Mischbehälter, mit einer beidseitig gelagerten Mischeinheit und mit einer Klumpenbrecheinheit in einer schematischen Schnittdarstellung parallel zu einer Drehachse der Mischeinheit,

Fig. 8

eine weitere alternative erfindungsgemäße Mischvorrichtung mit einem Mischbehälter, mit einer Mischeinheit und mit einer Klumpenbrecheinheit in einer schematischen Darstellung in einem Betriebszustand und

Fig. 9

eine weitere alternative erfindungsgemäße Mischvorrichtung mit einem Mischbehälter, mit einer beidseitig gelagerten Mischeinheit und mit einer Klumpenbrecheinheit in einer schematischen Schnittdarstellung parallel zu einer Drehachse der Mischeinheit.

Show it:

Fig. 1

a mixing device according to the invention with a mixing container, with a mixing unit mounted on one side and with a lump breaking unit in a schematic representation in an operating state,

Fig. 2

the mixing device according to the invention with the mixing container, with the mixing unit mounted on one side and with the lump breaking unit in a schematic representation in an opened state,

Fig. 3

the mixing device according to the invention with the mixing container, with the mixing unit mounted on one side and with the lump breaking unit, which has a cutter element, in a schematic sectional view along the section line III-III,

Fig. 4

the mixing device according to the invention with the mixing container, with the mixing unit mounted on one side and with the lump breaking unit, which has the cutter element, in a schematic sectional view along the section line IV-IV,

Fig. 5

a schematic flow diagram of a method for an operation of the mixing device,

Fig. 6

an alternative mixing device according to the invention with a mixing container, with a mixing unit mounted on one side and with a lump breaking unit in a schematic sectional representation perpendicular to a rotation axis of the mixing unit,

Fig. 7

FIG. 2 a further alternative mixing device according to the invention with a mixing container, with a mixing unit mounted on both sides and with a lump breaking unit in a schematic sectional representation parallel to a rotation axis of the mixing unit, FIG.

Fig. 8

a further alternative mixing device according to the invention with a mixing container, with a mixing unit and with a lump breaking unit in a schematic representation in an operating condition and

Fig. 9

a further alternative mixing device according to the invention with a mixing container, with a mixing unit mounted on both sides and with a lump breaking unit in a schematic sectional view parallel to a rotation axis of the mixing unit.

Description of the embodiments

FIG. 1 and 2 show a mixing device 10a. The mixing device 10a is formed by a bulk material mixing device. The mixing device 10a is formed by a batch bulk mixing device. The mixing device 10a is formed by a twin-shaft mixer. The mixing device 10a is formed by a horizontal double-shaft mixer. Preferably, the mixing device 10a may be provided for both batch and continuous mixing processes. In principle, however, another embodiment of a mixing device 10a that appears appropriate to a person skilled in the art would also be conceivable. A corresponding structure can basically also be applied to a single-shaft mixer. By means of the mixing device 10a is achieved by random particle exchange, in particular by dispersion, and targeted sharing and blending, in particular by convection, a homogeneous mixture of different blended. The mixing device 10a is intended for mixing solids and solids with liquids. In principle, however, another application that would appear meaningful to a person skilled in the art would also be conceivable.

The mixing device 10a has a mixing container 12a. The mixing container 12a has a cylindrical basic shape. A main extension direction 50a of the mixing container 12a extends substantially horizontally during operation. The mixing container 12a therefore has a lying cylindrical basic shape. Furthermore, the mixing container 12a forms a housing of the mixing device 10a. The mixing container 12a has an outer shell 48a. The outer shell 48a has a plurality of feet which support the mixing container 12a. The mixing container 12a is preferably mounted on the feet of the outer shell 48a on a frame, not shown. The outer shell 48a consists essentially of metal. In principle, however, another material design which would appear meaningful to a person skilled in the art would also be conceivable. Furthermore For example, the mixing container 12a has a receiving region 14a for receiving a mixture. The receiving area 14a has a cylindrical shape. The receiving area 14a has a constant cross-section along a central axis, viewed in a plane perpendicular to the central axis. The central axis of the receiving region 14a extends parallel to the main extension direction 50a of the mixing container 12a. The receiving area 14a is partially bounded by the outer shell 48a of the mixing container 12a. The receiving region 14a is bounded on a lateral surface by the outer shell 48a of the mixing container 12a. Furthermore, the mixing container 12a has two end walls 24a, 52a. The end walls 24a, 52a close the mixing vessel 12a at two opposite ends of the outer shell 48a. The end walls 24a, 52a define the receiving area 14a at opposite ends along the central axis of the receiving area 14a. The end walls 24a, 52a each extend in a plane perpendicular to the central axis of the receiving area 14a. The mixing container 12a has a pivoting door 36a in the region of an end wall 24a. The swing gate 36a is disposed in the end wall 24a. The end wall 24a of the mixing container 12a is substantially completely formed by the swing gate 36a. The pivoting door 36a serves in particular to make the receiving area 14a of the mixing container 12a accessible. The swing gate 36a is formed by a front door. FIG. 2 shows the swing gate 36a in an open state.

Furthermore, the mixing device 10a has a mixing unit 16a mounted on one side. The unilaterally mounted mixing unit 16a is provided for mixing the mixed material located in the mixing container 12a. The mixing unit 16a is mounted on one side in an end wall 52a of the mixing container 12a. The mixing unit 16a is formed by a wave mixing unit. The unilaterally mounted mixing unit 16a has at least one mixer shaft 26a, 28a. The mixing unit 16a mounted on one side has two mixer shafts 26a, 28a. The mixer shafts 26a, 28a extend substantially parallel to each other. The two mixer shafts 26a, 28a of the mixing unit 16a have parallel axes of rotation 32a, 34a. The axes of rotation 32a, 34a of the mixer shafts 26a, 28a each extend parallel to the main extension direction 50a of the mixing container 12a. The mixer shafts 26a, 28a are each mounted on one side. The mixer shafts 26a, 28a are formed by cantilevered, free-running mixing tools. The mixer shafts 26a, 28a are respectively supported in the end wall 52a of the mixing tank 12a. In the end wall 52a, this is a bearing for mixer shafts 26a, 28a arranged. The mixer shafts 26a, 28a each consist of a shaft 54a, 56a and a plurality of mixing means 58a, 60a arranged on a circumference of the shaft 54a, 56a. The shafts 54a, 56a of the mixer shafts 26a, 28a are each formed by a circular cylindrical solid shaft. In principle, however, another embodiment of the shafts 54a, 56a which would appear to be appropriate to a person skilled in the art would also be conceivable, for example as a hollow shaft. In an embodiment of the shaft 54a, 56a as a hollow shaft, it would in principle be conceivable that fluids, in particular liquids, can be supplied via a cavity of the shaft 54a, 56a. In particular, liquids could be introduced into the receiving area 14a via the shaft. The mixing means 58a, 60a are each formed by paddles. In principle, however, another form of mixing means 58a, 60a that would appear meaningful to a person skilled in the art would also be conceivable. The mixer shafts 26a, 28a are arranged during operation substantially in the receiving region 14a of the mixing container 12a. The mixer shafts 26a, 28a protrude into the receiving area 14a. The mixer shafts 26a, 28a each define in the receiving region 14a a circular-cylindrical mixing region in which a direct mixing takes place through the respective mixer shaft 26a, 28a. The shafts 54a, 56a of the mixer shafts 26a, 28a project from the receiving area 14a at one end through the end wall 52a and are driven there by a drive unit 62a. The drive unit 62a drives the two mixer shafts 26a, 28a via a gear which is not further visible. The drive unit 62a rotatably drives the two mixer shafts 26a, 28a. The drive unit 62a is formed by a motor. The drive unit 62a is formed by an electric motor. The mixing unit 16a is formed completely extendable from the mixing container 12a. An extension takes place via an extension carriage, not shown, on which the mixing unit 16a is mounted and which is guided on Ausziehschienen not shown. When pulled out, the drive unit 62a and the end wall 52a are also moved. By pulling out the mixing unit 16a, the mixer shafts 26a, 28a can be easily and completely pulled out of the mixer. The entire mixing container 12a is thus advantageously accessible for cleaning.

Furthermore, the mixing device 10a has a lump breaking unit 18a. The lump breaking unit 18a is provided during an operation of the mixing device 10a for comminution of clumps formed in the mix. The lump breaking unit 18a is in an end portion 22a of the mixing container 12a arranged. The lump breaking unit 18a is arranged on a side of the receiving area 14a opposite the bearing unit of the mixing unit 16a in a front area 22a of the mixing tank 12a. The lump breaking unit 18a is disposed in an end portion of the mixing container 12a. The lump breaking unit 18a is disposed in the end wall 24a of the mixing tank 12a. The lump breaking unit 18a is arranged in the end wall 52a, in which the mixing unit 16a is mounted, opposite end wall 24a of the mixing tank 12a. The end wall 24a is disposed on a base side of the cylindrical mixing container 12a. The lump breaking unit 18a is disposed in the swinging door 36a of the mixing tank 12a. The lump breaking unit 18a is disposed in the swinging door 36a of the end wall 24a of the mixing tank 12a. The lump breaking unit 18a can be pivoted out of the receiving region 14a of the mixing container 12a via the pivoting door 36a. The lump breaking unit 18a is pivoted with an opening of the pivoting door 36a ( FIG. 2 ). The lump breaking unit 18a has a cutter element 20a projecting into the mixing container 12a. In principle, it would also be conceivable for the lump breaking unit 18a to have a plurality of cutter elements 20a, which are arranged next to one another, for example. The cutter element 20a projects into a direct comminution of clumps in the mixing container 12a. The cutter element 20a forms a tool of the lump breaking unit 18a. The cutter element 20a has a shaft 64a which projects through the pivoting door 36a of the end wall 24a. In the swing gate 36a, a bearing 66a for the shaft 64a is received. On an outside of the pivoting door 36a, a drive unit 68a of the lump breaking unit 18a is arranged, which is provided during operation to drive the cutter element 20a. The drive unit 68a rotatably drives the shaft 64a of the cutter element 20a. Furthermore, the cutter element 20a has a plurality of blades 70a. The cutter element 20a has two blades 70a. The blades 70a are each formed by a double blade, which respectively form a cutting edge on both sides of a rotation axis. In principle, however, another number and / or design of the blades 70a appearing appropriate to a person skilled in the art would also be conceivable. The blades 70a are each arranged on a free, the drive unit 68a opposite side of the shaft 64a. The blades 70a are each disposed at an end of the shaft 64a projecting into the receiving portion 14a. The blades 70a are offset by 90 ° to each other. In principle, however, another embodiment of the cutter element 20a that appears appropriate to a person skilled in the art would also be conceivable. The cutter element 20a is mounted on one side. The cutter element 20a is on one of Bearing location of the mixer shafts 26a, 28a of the mixing unit 16a opposite side of the receiving area 14a stored ( FIG. 1 . 3 ).

An axis of rotation 30a of the cutter element 20a of the lump breaking unit 18a extends substantially parallel to the axes of rotation 32a, 34a of the mixer shafts 26a, 28a of the cantilevered mixing unit 16a. The rotation axis 30a of the cutter element 20a of the lump breaking unit 18a is offset from the rotation axes 32a, 34a of the mixer shafts 26a, 28a. Further, the cutter member 20a of the lump breaking unit 18a is partially disposed between the two mixer shafts 26a, 28a of the mixing unit 16a. The cutter element 20a, viewed in a plane perpendicular to the axes of rotation 32a, 34a of the mixer shafts 26a, 28a, is arranged at least with a partial area between the at least two mixer shafts 26a, 28a. Furthermore, the cutter element 20a of the lump breaking unit 18a cuts a rotation axis 30a of the first mixer shaft 26a of the mixing unit 16a. The cutter element 20a of the lump breaking unit 18a intersects the rotation axis 30a of the first mixer shaft 26a of the mixing unit 16a during operation in at least one rotational position of the cutter element 20a. The rotation axis 30a of the cutter element 20a of the lump breakage unit 18a is offset from the rotation axis 32a of the first mixer shaft 26a, and the blades 70a of the cutter element 20a intersect the rotation axis 32a of the first mixer shaft 26a during operation depending on the rotational position. The first mixer shaft 26a has a recess in the region of the cutter element 20a, so that the cutter element 20a can cut the axis of rotation 32a of the first mixer shaft 26a of the mixing unit 16a. The first mixer shaft 26a of the mixing unit 16a is shortened and does not protrude to the end wall 24a of the mixing container 12a in which the lump breaking unit 18a is disposed. The first mixer shaft 26a of the mixing unit 16a is shortened with respect to the second mixer shaft 28a. The cutter element 20a is at least partially disposed below an imaginary plane passing through the axes of rotation 32a, 34a of the mixer shafts 26a, 28a. The axis of rotation 30a of the cutter element 20a is arranged below an imaginary plane running through the axes of rotation 32a, 34a of the mixer shafts 26a, 28a ( FIG. 3 ).

The cutter element 20a of the lump breaking unit 18a has, viewed in a plane perpendicular to the axis of rotation 30a of the cutter element 20a, a cutter acting surface A ₁ . The Cutterwirkfläche A ₁ extends parallel to a main extension plane of the cutter element 20 a. Furthermore, the Cutterwirkfläche A ₁ extends parallel to a Main extension plane of the end wall 24a of the mixing container 12a. The Cutterwirkfläche A ₁ is formed by a circular area whose radius corresponds to a radius of Cutterlements 20 a. An area value of the cutter surface A ₁ is at least 2% of an area value of a wall surface A _{2 of} the end wall 24a of the mixing container 12a. The area value of the cutter surface A ₁ is approximately 4% of the area value of the wall surface A _{2 of} the end wall 24a of the mixing container 12a. In principle, however, another area ratio that would appear meaningful to a person skilled in the art would also be conceivable. The wall surface A _{2 of} the end wall 24a extends parallel to a main extension plane of the end wall 24a. The wall surface A ₂ is arranged on a receiving region 14 a of the mixing container 12 a side facing the end wall ( FIG. 4 ).

FIG. 5 shows a flowchart of a method for an operation of the mixing device 10a. FIG. 5 shows a flow diagram of a mixing process. During the process, mixing of a mixing material supplied to the mixing device 10a takes place. There is a mixing of solids and solids with liquids. For this purpose, a liquid addition takes place not visible during a process. For example, one or more nozzles spray liquid into the receiving area 14a. Furthermore, during the method, in a first method step 44a, mixing material 16a of mixing device 16a of mixing device 10a is transported to the cutter element 20a of lump breaker unit 18a of mixing device 10a by means of first mixer shaft 26a. The mixing means 58a of the first mixer shaft 26a designed as paddles are aligned for this purpose so that mixing material, which is located in the mixing region of the first mixer shaft 26a, is transported by means of the mixing means 58a to the cutter element 20a of the lump breaking unit 18a of the mixing device 10a. The mix is transported along the axis of rotation 32 of the first mixer shaft 26a to the cutter element 20a. Subsequently, in a second method step 72a, clots in the mix are destroyed by means of the cutter element 20a of the lump breakage unit 18a. Furthermore, the mix is partially conveyed by the cutter element 20a in the mixing region of the second mixer shaft 28a, in particular hurled. Subsequently, in a further method step 46a, mixed material is transported away from the cutter element 20a of the lump breaking unit 18a by means of the second mixer shaft 28a of the mixing unit 16a of the mixing device 10a. The mixing means 60a of the second mixer shaft 28a designed as paddles are for this purpose aligned that mix, which is conveyed by the cutter element 20a of the lump breaking unit 18a in the mixing region of the second mixer shaft 28a, by means of the mixing means 60a of the cutter element 20a of a lump breaker unit 18a is transported away. The mix is transported along the axis of rotation 34a of the second mixer shaft 28a away from the cutter element 20a. Subsequently, the first method step 44a is repeated. The mix is therefore partially cyclically promoted by the mixing vessel 12b.

In the FIGS. 6 to 9 four further embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the embodiments, with respect to the same components, features and functions on the description of the other embodiments, in particular the FIGS. 1 to 5 , can be referenced. To distinguish the embodiments, the letter a in the reference numerals of the embodiment of FIGS. 1 to 5 by the letters b to e in the reference numerals of the embodiments of the FIGS. 6 to 9 replaced. With regard to identically designated components, in particular with regard to components with the same reference numerals, can in principle also to the drawings and / or the description of the other embodiments, in particular the FIGS. 1 to 5 , to get expelled.

FIG. 6 shows a mixing device 10b with a mixing container 12b, with a mixing unit 16b mounted on one side and with a lump breaking unit 18b. The unilaterally mounted mixing unit 16b is provided for mixing the mixed material located in the mixing container 12b. The mixing unit 16b is formed by a wave mixing unit. The mixing unit 16b mounted on one side has two mixer shafts 26b, 28b. The mixer shafts 26b, 28b extend substantially parallel to each other. The two mixer shafts 26b, 28b of the mixing unit 16b have parallel axes of rotation 32b, 34b. The mixer shafts 26b, 28b define in a receiving region 14b of the mixing container 12b in each case a circular-cylindrical mixing region 38b, 40b in which a direct mixing takes place through the respective mixer shaft 26b, 28b. The mixer shafts 26b, 28b protrude along a main extension direction of the mixing container 12b through the entire receiving portion 14b. The mixer shafts 26b, 28b protrude with a free end until just before an end wall 24b of the mixing container 12b.

Furthermore, the mixing container 12b has the receiving region 14b for receiving a mixed material. The receiving area 14b has a substantially cylindrical shape. The receiving region 14b of the mixing container 12b has a bulge 42b lying outside the mixing regions 38b, 40b of the mixer shafts 26b, 28b. The bulge 42b is formed by a part-circular cylindrical bulge. The bulge 42b is provided only in a front region 22b of the mixing container 12b. In principle, however, it would also be conceivable that the bulge 42b extends over the entire length of the mixing container 12b. The bulge 42b adjoins an end wall 24b of the mixing container 12b. The bulge 42b is disposed below the rotational axes 32b, 34b of the mixer shafts 26b, 28b.

Further, the lump breaker unit 18b is provided for crushing clumps formed in the mix during operation of the mixer 10b. The lump breaking unit 18b is disposed in an end portion 22b of the mixing container 12b. The lump breaking unit 18b is disposed on a side of the receiving area 14b opposite to the storage location of the mixing unit 16b in a front area 22b of the mixing tank 12b. The lump breaking unit 18b is disposed in the end wall 24b of the mixing tank 12b. The lump breaking unit 18b is disposed in a swing gate 36b of the end wall 24b of the mixing tank 12b. The lump breaking unit 18b has a cutter element 20b projecting into the mixing container 12b. An axis of rotation 30b of the cutter member 20b of the lump breaker unit 18b extends substantially parallel to the axes of rotation 32b, 34b of the mixer shafts 26b, 28b of the cantilevered mixing unit 16b. The rotation axis 30b of the cutter member 20b of the lump breaking unit 18b is offset from the rotation axes 32b, 34b of the mixer shafts 26b, 28b. Further, the cutter element 20b of the lump breaker unit 18b is partially disposed between the two mixer shafts 26b, 28b of the mixing unit 16b. The cutter member 20b is disposed substantially outside the mixing portions 38b, 40b of the mixer shafts 26b, 28b. The cutter element 20b is disposed substantially in the bulge 42b. The cutter element 20b of the lump breaking unit 18b protrudes into the bulge 42b.

FIG. 7 shows a mixing device 10c with a mixing container 12c, with a mixing unit 16c mounted on both sides and with a lump breaking unit 18c. The mixing unit 16c mounted on both sides is for mixing in the mixing container 12c provided mix. The mixing unit 16c is formed by a wave mixing unit. The mixing unit 16c has two mixer shafts 26c. In principle, however, it would also be conceivable that the mixing unit 16c has only one mixer shaft 26c. A corresponding structure can basically also be applied to a single-shaft mixer. The mixer shafts 26c extend substantially parallel to each other. The two mixer shafts 26c of the mixing unit 16c have parallel axes of rotation 32c, 34c. The mixer shafts 26c protrude along a main extension direction of the mixing container 12c through the entire receiving portion 14c. The mixer shafts 26c are supported at both ends, respectively.

Furthermore, the mixing container 12c has the receiving region 14c for receiving a mixed material. The receiving area 14c has a cylindrical shape. The receiving region 14c of the mixing container 12c has a bulge 42c lying outside a mixing region of the mixer shafts 26c. The bulge 42c is formed by a part-circular cylindrical bulge. In principle, however, for example, a rectangular formation of the bulge 42c would be conceivable. The bulge 42c extends over the entire length of the mixing container 12c. The bulge 42c adjoins an end wall 24c of the mixing container 12c. The bulge 42c is disposed below the rotation axes 32c, 34c of the mixer shafts 26c. On an underside of the bulge 42c, an outlet opening 74c of the mixing device 10c is arranged.

Further, the lump breaker unit 18c is provided for crushing clumps formed in the mix during operation of the mixer 10c. The lump breaking unit 18c is disposed in an end portion 22c of the mixing container 12c. The lump breaking unit 18c is disposed on a side of the receiving portion 14c opposite to the bearing portion of the mixing unit 16c in an end portion 22c of the mixing container 12c. The lump breaking unit 18c is disposed in the end wall 24c of the mixing tank 12c. The lump breaking unit 18c has at least one cutter element 20c projecting into the mixing container 12c. The lump breaking unit 18c has a plurality of cutter elements 20c protruding into the mixing container 12c. The cutter elements 20c have a common shaft 64c which projects through the end wall 24c. A bearing for the shaft 64c is received in the end wall 24c. On an outer side of the end wall 24c, a drive unit 68c of the lump breaking unit 18c is arranged, which is provided during operation to drive the cutter elements 20c. The drive unit 68c rotatably drives the shaft 64c of the cutter elements 20c. The shaft 64c of the cutter elements 20c is mounted on both sides. The shaft 64c of the cutter elements 20c is supported on both end walls 24c, 52a of the mixing container 12c. An axis of rotation 30c of the cutter elements 20c of the lump breaking unit 18c extends substantially parallel to the axes of rotation 32c, 34c of the mixer shafts 26c of the mixing unit 16c. The rotation axis 30c of the cutter elements 20c of the lump breaking unit 18c is offset from the rotation axes 32c, 34c of the mixer shafts 26c. Further, the cutter members 20c of the lump breaking unit 18c are partially disposed between the two mixer shafts 26c of the mixing unit 16c. The cutter elements 20c are disposed substantially outside the mixing portions of the mixer shafts 26c. The cutter elements 20c are arranged substantially in the bulge 42c.

FIG. 8 shows a mixing device 10d with a mixing container 12d, with a mixing unit 16d and with a lump breaking unit 18d. The mixing unit 16d is provided for mixing the mixture in the mixing tank 12d. The mixing unit 16d is formed by a wave mixing unit. The mixing unit 16d has two mixer shafts 28d. The mixer shafts 28d extend substantially parallel to each other. The two mixer shafts 28d of the mixing unit 16d have parallel axes of rotation 32d, 34d. The mixer shafts 28d each consist of a shaft 56d and a plurality of mixing means 60d arranged on a circumference of the shaft 56d. The shafts 56d of the mixer shafts 28d project at one end from an accommodating portion 14d through an end wall 52d of the mixing container 12d and are driven there by a drive unit 62d. The drive unit 62d drives the two mixer shafts 28d via a transmission which is not further visible. The drive unit 62d rotatably drives the two mixer shafts 28d.

Further, the lump breaker unit 18d is provided for crushing clumps formed in the mix during operation of the mixer 10d. The lump breaking unit 18d is disposed in an end portion 22d of the mixing container 12d. The lump breaking unit 18d is arranged in a front region 22d of the mixing container 12d on a side of the receiving region 14d facing the mixing unit 16d. The lump breaking unit 18d is disposed in the end wall 52d of the mixing container 12d, in which the mixing unit 16d is also supported.

The lump breaking unit 18d has a cutter element 20d protruding into the mixing container 12d. An axis of rotation of the cutter element 20d of the lump breaker unit 18d extends substantially parallel to the axes of rotation of the mixer shafts 28d of the cantilevered mixing unit 16d. The axis of rotation of the cutter element 20d of the lump breaking unit 18d is offset from the axes of rotation of the mixer shafts 28d. Further, the cutter element 20d of the lump breaking unit 18d is partially disposed between the two mixer shafts 28d of the mixing unit 16d.

FIG. 7 shows a mixing device 10e with a mixing container 12e, with a mixing unit 16e mounted on both sides and with a lump breaking unit 18e. The mixing device 10e is formed by a continuous bulk material mixing device. The mixing unit 16e mounted on both sides is provided for mixing the mixed material located in the mixing container 12e. The mixing unit 16e is formed by a wave mixing unit. The mixing unit 16e has a mixer shaft 26e. In principle, however, it would also be conceivable that the mixing unit 16e has, for example, two mixer shafts 26e. The mixer shaft 26e of the mixing unit 16e has a turning axis 32e. The rotation axis 32e extends parallel to a main extension direction 50e of the mixing container 12e. The mixer shaft 26e protrudes along the main extension direction 50e of the mixing container 12e through an entire receiving region 14e. The mixer shaft 26e is supported at both ends.

The mixing container 12e has a substantially cylindrical basic shape. A main extension direction 50e of the mixing container 12e extends substantially horizontally during operation. Further, the mixing container 12e forms a housing of the mixing device 10e. The mixing container 12e has an outer shell 48e. Furthermore, the mixing container 12e has the receiving region 14e for receiving a mixed material. The receiving area 14e has a substantially cylindrical shape. The receiving area 14e is partially bounded by the outer shell 48e of the mixing tank 12e. The receiving region 14e is delimited on a lateral surface by the outer shell 48e of the mixing container 12e. Further, the mixing container 12e has two end walls 24e, 52e. The end walls 24e, 52e close the mixing vessel 12e at two opposite ends of the outer shell 48e. The end walls 24e, 52e define the receiving area 14e at opposite ends along the central axis of the receiving area 14e. The end walls 24e, 52e each extend substantially perpendicular to the central axis of the receiving area 14e. The end walls 24e, 52e are each inclined relative to the rotation axis 32e of the mixer shaft 26e by a minimum angle of 70 °. In principle, however, another angle that would appear appropriate to a person skilled in the art would also be conceivable. The end walls 24e, 52e are inclined away from each other on one side. The end walls 24e, 52e run conically toward each other towards the top. The end walls 24e, 52e are each inclined at 40 ° to each other.

Further, the lump breakage unit 18e is provided for crushing clumps formed in the mix during operation of the mixer 10e. The lump breaking unit 18e is disposed in an end portion 22e of the mixing container 12e. The lump breakage unit 18e is arranged on an opposite side of the receiving area 14e on the bearing point of the mixing unit 16e in an end region 22e of the mixing container 12e. The lump breaking unit 18e is disposed in the end wall 24e of the mixing tank 12e. The lump breaking unit 18e has a cutter element 20e projecting into the mixing container 12e. The cutter element 20e has a shaft 64e which projects through the end wall 24e. A bearing for the shaft 64e is received in the end wall 24e. On an outer side of the end wall 24e, there is disposed a drive unit 68e of the lump breaking unit 18e which is provided to drive the cutter member 20e during operation. The drive unit 68e rotatably drives the shaft 64e of the cutter element 20e. A rotation axis 30e of the cutter element 20e of the lump breakage unit 18e extends substantially parallel to the rotation axis 32e of the mixer shaft 26e of the mixing unit 16e. The axis of rotation 30e of the cutter element 20e of the lump breaking unit 18e is inclined at least 5 ° with respect to the axis of rotation 32e of the mixer shaft 26e of the mixing unit 16e. The axis of rotation 30e of the cutter element 20e of the lump breaking unit 18e is inclined at least 15 ° with respect to the axis of rotation 32e of the mixer shaft 26e of the mixing unit 16e. The axis of rotation 30e of the cutter element 20e of the lump breaking unit 18e is inclined by a maximum of 30 ° relative to the axis of rotation 32e of the mixer shaft 26e of the mixing unit 16e. The rotation axis 30e of the cutter element 20e of the lump breaking unit 18e is inclined by 20 ° with respect to the rotation axis 32e of the mixer shaft 26e of the mixing unit 16e.

Claims (13)

Mixing device, in particular bulk material mixing device, with at least one mixing container (12a, 12b, 12c, 12d, 12e), which has a receiving region (14a, 14b, 14c, 14d, 14e) for receiving a mixed material, with at least one mixing unit (16a, 16b 16c, 16d, 16e) provided for mixing the mix in the mixing tank (12a, 12b, 12c, 12d, 12e) and at least one lump breaking unit (18a, 18b, 18c, 18d, 18e) at least one cutter element (20a; 20b; 20c; 20d; 20e) protruding into the mixing container (12a; 12b; 12c; 12d; 12e),
characterized in that
the at least one lump breaking unit (18a; 18b; 18c; 18d; 18e) is arranged in an end region (22a; 22b; 22c; 22d; 22e) of the mixing container (12a; 12b; 12c; 12d; 12e). Mixing device according to claim 1,
characterized in that
the at least one mixing unit (16a; 16b; 16d) is mounted on one side. Mixing device according to claim 1 or 2,
characterized in that
the at least one lump breaking unit (18a; 18b; 18c; 18d; 18e) is disposed in an end wall (24a; 24b; 24c; 52d; 24e) of the mixing container (12a; 12b; 12c; 12d; 12e). Mixing device according to one of the preceding claims,
characterized in that
the at least one mixing unit (16a; 16b; 16c; 16d; 16e) has at least one mixer shaft (26a, 28a; 26b, 28b; 26c; 28d; 26e). Mixing device according to claim 4,
characterized in that
an axis of rotation (30a; 30b; 30c; 30e) of the cutter element (20a; 20b; 20c; 20d; 20e) of the at least one lump breaking unit (18a; 18b; 18c; 18d; 18e) is at least substantially parallel to an axis of rotation (32a; 34a; 32b, 34b; 32c; 32e) of the at least one mixer shaft (26a, 28a; 26b, 28b; 26c; 28d; 26e) of the cantilevered mixing unit (16a; 16b; 16c; 16d; 16e). Mixing device according to one of the preceding claims,
characterized in that
in a region of an end wall (24a; 24b; 24c; 24e), the mixing container (12a; 12b; 12c; 12e) has a pivoting door (36a; 36b; 36c; 36e) in which the at least one lump breaking unit (18a; 18b; 18c ; 18e) is arranged. Mixing device according to one of the preceding claims,
characterized in that
the at least one mixing unit (16a; 16b; 16c; 16d) has at least two mixer shafts (26a, 28a; 26b, 28b; 26c; 28d) which extend substantially parallel to one another. Mixing device according to claim 7,
characterized in that
the at least one cutter element (20a; 20b; 20c; 20d) of the lump breaker unit (18a; 18b; 18c; 18d) is at least partially interposed between the at least two mixer shafts (26a, 28a; 26b, 28b; 26c; 28d) of the at least one mixing unit (16a 16b, 16c, 16d). Mixing device at least according to claim 4 or 7,
characterized in that
the at least one cutter element (20a) of the lump breaking unit (18a) intersects an axis of rotation (30a) of the mixer shaft (26a) of the at least one mixing unit (16a). Mixing device according to one of the preceding claims,
characterized in that
the receiving region (14b; 14c) of the at least one mixing container (12b; 12c) has at least one bulge (42b; 42c) located outside a mixing region (38b, 40b) of the at least one mixer shaft (26b, 28b; a cutter element (20b; 20c) of the lump breaking unit (18b; 18c) protrudes. Mixing device according to one of the preceding claims,
characterized in that
the at least one cutter element (20a; 20b; 20c; 20d; 20e) of the lump breaking unit (18a; 18b; 18c; 18d; 18e), in a plane perpendicular to a rotation axis (30a; 30b; 30c; 30e) of the at least one cutter element (20a; 20a; 20b; 20c; 20d; 20e) has a cutter surface (A ₁ ) whose area value is at least 2% of an area value of a wall surface (A ₂ ) of an end wall (24a; 24b; 24c; 52d; 24e) of the mixing tank (12a 12b, 12c, 12d, 12e). Method for operating a mixing device (10a; 10b; 10c; 10d; 10e) according to one of the preceding claims,
characterized in that
in at least a first method step (44a) by means of a mixer shaft (26a; 26b; 26c; 26e) of a mixing unit (16a; 16b; 16c; 16d; 16e) of the mixing device (10a; 10b; 10c; 10d; 10e) mix to a cutter element (20a; 20b; 20c; 20d; 20e) of at least one lump breaking unit (18a; 18b; 18c; 18d; 18e) of the mixing device (10a; 10b; 10c; 10d; 10e) is transported. Method according to claim 12,
characterized in that
in at least one further method step (46a) by means of a mixer shaft (28a; 28b; 28d) of the mixing unit (16a; 16b; 16c; 16d) of the mixing device (10a; 10b; 10c; 10d) mix material from the cutter element (20a; 20b; 20c 20d) of the at least one lump breaking unit (18a; 18b; 18c; 18d) is transported away.

Images