EP3883678A1

EP3883678A1 - Mixing tool for an industrial mixing machine, mixing tool set having such mixing tools, and mixing machine having such a mixing tool set

Info

Publication number: EP3883678A1
Application number: EP20702594.1A
Authority: EP
Inventors: Wolfgang Rüberg; Matthias Tölle
Original assignee: Dr Herfeld GmbH and Co KG
Current assignee: Dr Herfeld GmbH and Co KG
Priority date: 2019-01-31
Filing date: 2020-01-24
Publication date: 2021-09-29
Anticipated expiration: 2040-01-24
Also published as: EP3883678C0; ES2951940T3; EP3883678B1; DE202019100576U1; EP3883678B8; WO2020156946A1

Abstract

The invention relates to a mixing tool for an industrial mixing machine for mixing a mixture typically consisting of a plurality of components, the mixing tool comprising: - a hub (2); - means for connecting the mixing tool (1) to a rotationally driven mixing tool shaft (16); and - at least two mixing tool blades (5), (5.1) of the same type. The mixing tool blades (5), (5.1) have connecting portions (6), (6.1) which are angled relative to the plane of the hub (2) in directions which are opposite with respect to the longitudinal extent of the axis of rotation D. A mixing blade portion (7), (7.1) is integrally formed on each connecting portion, which mixing blade portion extends away from the hub (2) in the radial direction, is adjusted relative to the plane of the hub (2) in the direction of rotation and in the radial direction and is inclined in the opposite direction to the connecting portion (6), (6.1).

Description

Mixing tool for an industrial mixing machine, mixing tool set with such mixing tools and mixing machine with such a mixing tool set

The invention relates to a mixing tool for an industrial mixing machine for mixing a mix typically consisting of several components with a hub with means for connecting the mixing tool to a rotary-driven mixing tool shaft and with at least two similar mixing tool blades. Also described are a mixing tool set that has two such mixing tools and a mixing device with such a mixing tool set.

Industrial mixing machines are used for mixing bulk goods, typically powdery bulk goods, as is required for creating plastic granulate mixtures or in the paint industry. Such mixing machines have a pivotable mixing head compared to egg nem frame, which is also used to close a mixing container containing the mix, which is connected to the mixing head for the purpose of mixing a mixture therein. Due to the fact that a mixing container containing the material to be mixed is connected to the mixing head in these mixing machines, these are also referred to as container mixers. A tool shaft, which is driven or driven in rotation, passes through the bottom of the mixing head of such a mixing machine. A mixing tool sits on the tool shaft, through which the mixing particles contained in the mixing container are mixed together during the mixing process. Such a mixing tool has two mixing tool blades diametrically opposite one another with respect to a tool hub. These are located in the plane transverse to the axis of rotation, and therefore in the plane of the hub of the mixing tool. If such a mixing tool, when covered by the material to be mixed, is driven in rotation, the material to be mixed is set into a rotary movement with a movement component directed outwards in the radial direction. This is responsible for that a mixing thrombus is formed within the mixing container. The material moved outward in the radial direction is moved away from the mixing tool over the walls of the mixing container and, since moved against the force of gravity, falls back inside the mixing container in the direction of the mixing tool.

When mixing mixes in industrial mixers, the mixing time, and therefore the time required for a mixing process so that the mix has reached the desired degree of mixing, plays a decisive role. Depending on the mix to be mixed, care must be taken to ensure that, in order to avoid caking or sticking of mix particles to one another, the energy input into the mix may only be low. Is the mix sensitive to temperature, i.e. : the mix tends to cake and clump at relatively low temperatures, cooling mixers are used to control the temperature increase that is virtually unavoidable due to mixing. In other cases, a certain amount of energy is required in the mix to bring it to a certain temperature. Then Heizmi shearers are used in which the mixing container is heated. Although the mixing tool and the mixing process when forming a mixing trombus also result in a certain energy input due to wall friction. However, this is not sufficient so that the required temperatures, for example temperatures of 90 to 110 ° C., are reached in a short time. Therefore, heating mixers are used in such cases. Such heating mixers - the same applies to cooling mixers - are expensive in their construction and operation. These cannot be operated as container mixers. Mixing in a heating mixer therefore requires that the mix in a container, typically a mixing container, is filled into the heating mixer and removed from it after the mixing process has been completed. Not only filling and emptying requires additional measures, but also cleaning the same when changing batches.

In principle, heat input into the mix is also possible with container mixers. Mixing tool sets are used for this, typically with three mixing tools, one of which clears the ground Is mixing tool. The two mixing tools located above the floor-clearing tool have opposite mixing tool blades. The mixing tool blades are in a common plane with the hub. The energy input is controlled via the speed at which the mixing tools of such a mixing tool set are driven. Sometimes, however, the time required to introduce the desired heat into the mix is considered too long. Accordingly, the demand for shorter cycle times cannot be satisfied with such mixers. In the case of such mixers, the mixing process is determined by the duration of the necessary energy input and not by the time required for mixing the mixed material particles.

Starting from this discussed prior art, the invention is therefore based on the object to remedy this.

This object is achieved according to the invention by an initially mentioned generic mixing tool, in which the mixing tool blades each have an opposite angle to the plane of the hub in opposite directions with respect to the longitudinal extent of the axis of rotation, each of which has a radial direction from the hub Shaping mixing wing section, which extends away from the plane of the hub in the direction of rotation and in the radial direction and is inclined in the opposite direction to the connecting section, is formed.

This mixing tool is designed for mixing mixed material, in particular of such mixed material, which is to be mixed intensively at temperatures which are higher than the ambient temperature. With regard to its mixing tool blades, this mixing tool is designed to introduce energy into the material to be mixed and thus to ensure a temperature rise in the mixing process. The energy is introduced into the mix in principle in two height ranges, which height ranges are spaced apart from one another in the direction of the extent of the axis of rotation. This is achieved by providing a connecting section each in each mixing tool wing, which is the hub of the Mixing tool connects to a mixing wing section and the two connecting sections are angled in opposite directions in the longitudinal extent of the axis of rotation. As a result, the one mixing wing section is in a different position with respect to the longitudinal axis of the mixing tool than the other mixing tool wing. This spacing of the mixing tool blades leads to the two above-mentioned height ranges within the material to be mixed. In this mixing tool, the actual mixing work is carried out by the mixing wing sections, even if, depending on the design, the connecting section can additionally have a mixing and / or energy input functionality. In a preferred embodiment, the Verbindungsab section is not made in the direction of rotation. The mixing wing sections extend outward from the connecting section in the radial direction, and these can have a sickle-like curvature in the radial direction. The mixing blade sections themselves can be made flat. A curved configuration is also conceivable. In the case of a curved configuration, the mixing wing sections can pass into the respective connecting section. Otherwise, the mixing wing sections are formed at an angle on the respective connecting section. The mixing wing sections are inclined in opposite directions to the connecting sections. What is remarkable about this mixing tool is the position of the mixing vane sections in relation to the plane of the hub. The mixing vane sections are positioned opposite the plane of the hub, which plane is the plane transverse to the axis of rotation, in two directions of this plane, namely in the direction of rotation and in the radial direction of the axis of rotation. Thus, the mixing wing sections assume a spatial position inclined in the direction of rotation and in the radial direction. The angle of attack of the mixing wing sections can be different or the same in both directions. A typical angle of attack can be specified as 10 to 15 degrees. The angle of attack will be selected depending on the material to be mixed and the intended speed of rotation, since more or less energy is introduced into the material to be mixed when the mixing tool rotates, depending on the angle of attack. With a rotating drive of such a mixing tool, the inclination of the mixing vane sections a moment corresponding to the inclination is introduced into the mixed material particles, the moment of motion having a vectorial portion corresponding to the inclination in the axial direction away from the mixing tool. Due to the inclination of the mixing vane sections also with respect to the radial extent of the plane of the hub, the material to be mixed is acted on in the axial direction away from the mixing tool, but also with a moment of motion directed in the direction of the axis of rotation or in the direction of the axis of rotation . This justifies the special energy input that is possible with such a mixing tool. The energy input can be controlled via the speed of rotation of the mixer, which means that the temperature input into the mix can also be controlled.

The inclination of the mixing vane sections in two directions of the hub plane means that the throwing direction of the material to be mixed from the mixing vane sections is not parallel to the axis of rotation, but is directed towards or away from the axis of rotation to the extent of this. If the torque is designed to move the mix to the axis of rotation, the mix flow generated in the mixing container by the mixing tool is kept away from the walls of the mixing container, so that wall caking of the mixture is effectively avoided. The mixing material is conveyed away from the mixing container by such a mixing tool. Such an adjustment of the mixing vane sections therefore makes it possible for one and the same mixing tool to be used for mixing containers with different diameters. In known mixing machines, the diameter of the mixing tool was matched to the diameter of the mixing container, which was necessary since the side walls of the mixing container were required to guide the mixture in order to generate the mixture flow. Such an adaptation is fundamentally not necessary in a mixing machine with the mixing tool according to the invention, since the mixing tool is largely responsible for the formation of a mixing trombus, while the side walls of the mixing container only prevent excessive distribution of the conveyed mixture. Thus, a mixing machine can also be equipped with such a mixing tool Mixing head mixing containers with a different diameter of their connecting flange can be connected.

This mixing tool can be used in the mixing head of a conventional container mixer known per se, with which then such mix can also be mixed, which could only be mixed conventionally only in heating mixers or in conventional container mixers with a correspondingly long process duration of the mixing. This not only simplifies handling, but also shortens the process time compared to conventional mixing processes with heating mixers. This is not just because there is no need to fill and drain the heating mixer. Rather, the heat input with such a mixing tool is more intensive, since the induced rotary movement, by which the entire mix is recorded, causes the energy and thus the heat input and does not have to be waited until the mix is used when a heating mixer is used by heat conduction in the In the event of a wall contact or heat radiation in the absence of wall contact, it is sufficiently heated. In a heating mixer, only the mixed material particles transported in the area near the wall are heated, which explains that it takes some time until the entire mixed material has reached the desired mixing temperature.

Typically, such a mixing tool has two mixing tool vanes opposite one another to the axis of rotation of the hub. Such a mixing tool can also have several, for example three or four, mixing tool blades.

The result of the high energy input and very short cycle times of, for example, only 3 to 4 minutes achieved with this mixing tool when mixing plastic granulate for PVC production and reaching a mixing temperature of 110 ° C is surprising, since the prevailing teaching stipulates that the mixing tool has to move the mixing particles, however, only as little energy as possible has to be entered into the mix and, in the case of temperature control, the mixing process must be carried out in a heating or cooling mixer. According to one exemplary embodiment, the end faces of the mixing tool blades pointing in one and the other direction of rotation are asymmetrical with respect to a central longitudinal plane intersecting the mixing blade section. This different contour on the two faces of a mixing wing section also allows an influence on the energy input. Due to the asymmetrical design of the mixing vane sections, the energy input into the mix with a rotating drive of the mixing tool in one direction is different than in the other direction.

Regardless of whether or not in a plan view the mixing wing sections are designed asymmetrically with respect to the aforementioned central longitudinal plane, the end face pointing in one direction of rotation or a portion thereof can be designed as a cutting edge while the other end face is blunt. If such a mixing tool is operated with its cutting edge pointing in the direction of rotation, the mixing material is mixed and also homogenized by the operation of the mixing tool. Through an alternating turning operation of the mixing tool within a mixing ratio of a mixing machine and a change in the speed, the mixing process can be controlled and adapted particularly well to the properties of the material to be mixed.

For homogenization purposes, it is expedient if the end face of such a mixing blade, which forms the cutting edge, is made sickle-shaped. The sickle shape can be introduced by introducing a curved piece into the otherwise just executed end face carrying the cutting edge. The depth of the sickle shape will generally be provided at about 5 to 15% of the width of the mixing wing section. According to one embodiment of such a mixing tool, the mixing blade sections each end in a mixing blade tip which is arranged eccentrically with respect to the mixing blade width. According to one exemplary embodiment, the mixing blade tip can be located in the extension of a straight section of an end face adjoining the hub. Seen in a plan view, such a mixing vane section is asymmetrical to the central longitudinal plane intersecting the mixing vane section, in which also the axis of rotation is located. If a sickle-shaped section - with or without cutting edge - is provided on one end of the mixing wing section, this can end with its radially outer section in the mixing wing tip.

In one embodiment, in which the mixing wing sections end radially on the outside in an asymmetrical mixing wing tip arranged asymmetrically to the central longitudinal plane, the end face opposite the shorter end face of the mixing wing section can be rounded starting from the mixing wing tip. The radius of curvature can be constant or can also increase with increasing distance of the end face from the mixing wing tip. In a mixing tool designed in this way, the mixing wing tips with their differently long end faces, depending on the direction of rotation, introduce different amounts of energy into the mix with a rotating drive.

The mixing vane sections are set in opposite directions with respect to the hub plane according to an embodiment in the direction of rotation of the mixing tool. The direction of action or throw-off of such a mixing tool is then different between the two mixing blades or mixing blade sections. While one section of the mixing blade gives the material to be mixed an impulse in the one longitudinal axial direction, the material to be mixed experiences a movement impulse in the opposite axial longitudinal direction by the other section of the mixing blade. Thus, energy is introduced by such a mixing tool both towards and away from the bottom of a mixing container. Because of the inclination of the mixing wing sections in the two directions mentioned, the same also applies to a dropping in the direction of the axis of rotation or in the direction away from the axis of rotation. With regard to a radial movement impulse, which is introduced into the material to be mixed by the mixing vane sections, the centrifugal force acting on the material by rotation in the circumferential direction can, if desired, be counteracted.

The hub of such a mixing tool has a shaft bushing with means for torque-locking connection of the mixing tool to a drive shaft. With such a means it can are, for example, a key holder. Typically, two feather key receptacles are provided so that the mixing tool can be arranged on a tool shaft of a mixing machine in two positions, each offset by 90 degrees in the direction of rotation. This allows a tool shaft to be equipped with two such mixing tools, which are connected to one another by 90 degrees in the direction of rotation connected to the tool shaft. With such a mixing tool set formed from two such mixing tools, correspondingly more energy is introduced into the mix. The energy input and thus the mixing result can also be influenced by the arrangement of the mixing tools of such a mixing tool set. The mixing tools of such a mixing tool set can be viewed in the same direction or in opposite directions to each other.

The mixing tool or the next-to-ground mixing tool of a plurality of mixing tools of this or other type having a mixing tool set will typically be arranged at a distance from the bottom of the mixing container or mixing head, specifically because of the opposing position of the mixing blade sections in a mixing blade section Ejection direction towards the ground. In such a case, it is advisable to additionally provide a ground clearing tool, typically sitting on the same tool shaft as the mixing tool or tools. Such a ground clearing tool supports the mixing process, but is primarily used to empty the mixing container.

If a mixing tool set formed from at least two such mixing tools is provided, the two mixing tools can be arranged in the same sense or in opposite directions to one another. An opposing arrangement is an arrangement in which, in the case of two identical mixing mechanisms, the one mixing tool is turned 180 degrees around its mixing tool and is fixed to the axis of the other mixing tool on the drive shaft. In this way, the mixing process can be intensified, since the mixing tools then introduce it Movement impulses are directed in different directions. Therefore, mixing with such a mixing tool set is particularly suitable when a very high degree of shear and thus energy is to be introduced into the mix.

The invention is described below using an exemplary embodiment with reference to the accompanying figures. Show it:

1 is a perspective view of a mixing tool for an industrial mixing machine,

2: a top view of a development of the mixing tool of FIG. 1, FIGS. 3a-3c: different views of the mixing tool of FIG. 1,

4: a mixing tool set with two mixing tools of FIGS. 1 to 3 in a first arrangement of the two mixing tools with respect to one another and with a floor-clearing tool,

5: a further mixing tool set corresponding to that of FIG. 4, but with a different arrangement of its mixing tools with one another,

6: a further mixing tool set corresponding to that of FIG. 4, but with yet another arrangement of the two mixing tools, FIG. 7: a perspective, partially sectioned illustration of a mixing container with the tool set according to FIGS. 4 and

Fig. 8: a schematic representation of the mixing head

Mixing machine with a mixing tool set formed from two mixing tools of Figures 1 to 3. A mixing tool 1 for an industrial mixing machine for mixing, for example, plastic granules in connection with the manufacture of PCV is produced in the illustrated embodiment as a bent part made of stainless steel. The mixing tool 1 comprises a hub 2 with a shaft bushing 3. The shaft bushing 3 has two Passfe deraufnahmen 4, 4.1, which are arranged at an angle of 90 degrees to each other. The tool shaft on which the mixing tool 1 is to be mounted has a complementary feather key, so that the mixing tool 1 can be fastened to it in two different positions with respect to the feather key of the tool shaft. The hub 2 forms the central or central component of the mixing tool 1. On the hub 2 formed in a plane perpendicular to the axis of rotation D, two mixing tool blades 5, 5.1 diametrically opposed to the axis of rotation D are formed. The mixing tool blades 5, 5.1 are constructed in the same way, thus point-symmetrically to the axis of rotation D (see FIG. 2).

The mixing tool blade 5 is described in more detail below. The same designs apply equally to the mixing tool wing 5.1. The mixing tool wing 5 comprises a connecting section 6 and a mixing wing section 7. The connecting section 6 is formed at an angle on the hub 2. The angle that the connecting section 6 makes with the plane of the hub 2 is typically between 30 to 45 degrees. In the illustrated embodiment, this angle a is 42 degrees (see also FIG. 3b). The bending line with which the connecting section 6 is angled relative to the plane of the hub 2 is identified in the illustration of FIG. 2 showing the development of the mixing mechanism 1 with the reference symbol 8. The connecting section 6 is thus angled relative to the hub due to the orientation of the bending line 8 only in the direction of the longitudinal extent of the axis of rotation relative to the hub 2 and is therefore not set in the direction of rotation. The mixing wing section 7 is angled relative to the plane of the connecting section 6, namely along a bending line 9 (see FIG. 2). In contrast to the bending line 8, the bending line 9 does not run transversely to the longitudinal extent of the mixing tool wing 5, but with a certain inclination to it, which inclination in the exemplary embodiment shown is approximately 33 degrees with respect to one running line 9.1 is executed. In Figure 2, this angle is made known with ß. Because of this orientation of the bending line 9, with which the mixing wing section 7 is angled relative to the connecting section 6, the mixing wing section 7 is positioned with respect to the plane of the hub 2, specifically in the direction of rotation or rotation, and seen in the radial direction. This has the effect that when the mixing tool 1 is driven to the left, as indicated by arrows in FIG is directed towards the hub 2. When the direction of rotation is reversed (clockwise rotation), the material to be mixed experiences a downward and in the radial direction outward movement impulse through the underside of the mixing blade section 7.1 shown in FIG. 1. Due to the point-symmetrical design of the mixing tool 1 with respect to the axis of rotation D, the mixing wing section 7.1 of the mixing tool wing 5.1 compared to the connecting section 6.1, seen in the direction of rotation, is employed in the opposite direction to the mixing wing section 7.1. When the mixing tool 1 is driven to the left, the mix thus experiences a downward and outward movement impulse through the underside of the mixing blade section 7.1.

The plan view of the development of the mixing tool 1 in FIG. 2 makes it clear that the mixing blades 5, 5.1 are asymmetrical with respect to a central longitudinal plane, the track of which is identified in FIG. 2 by the reference symbol M. The face of a counterclockwise drive of the mixing tool 1 pointing in the direction of rotation is executed in the embodiment shown in the area of the Mischflügelabschnit tes 7 sickle-shaped. This supports the energy input into the mix to be mixed. The crescent-shaped design of the end of the mixing wing section 7 pointing in the direction of rotation in the case of a drive rotating to the left supports the conveying of mixed material away from a wall of a mixing container enclosing the mixing unit 1. In an embodiment not shown in the figures, the crescent-shaped section of this end face of the mixing-wing section 7 is designed as a cutting edge. Due to the employment of the mixing wing section 7 has the upper edge of this end face in the direction of rotation, so that a certain cutting or homogenizing effect is achieved by this.

The asymmetrical design of the mixing blade section 7 in relation to the track of the center plane in FIG. 2 identified by the reference symbol M, in which the axis of rotation D is also located, is due to the fact that both end faces of the mixing blade section 7 are brought together in a mixing blade tip 10. The mixing vane tip 10 is located in the extension of the straight section of the end face which is pointing in the direction of rotation when the drive rotates to the left and is molded onto the hub 2. Starting from the mixing wing tip 10, the other end face is rounded off, a constant radius of curvature being chosen in the illustrated embodiment before this end face merges into its straight, molded onto the hub 2 end face portion.

The mixing blade section 7 is angled relative to the connecting section 6 along the bending line 9 in the illustrated embodiment at an angle of 110 degrees (see FIG. 3c). Figures 3a - 3c show different views of the mixing tool 1. Figure 3a shows the mixing tool 1 in a plan view. FIG. 3b shows the mixing tool 1 in a side view of the hub 2. The setting of the mixing vane sections 7, 7.1 can be clearly seen. It can also be seen that the mixing wing sections 7, 7.1 are located in different planes with respect to the longitudinal extent of the axis of rotation D. FIG. 3c shows a side view of the end faces of the mixing wing sections 7, 7.1. Because of their position, the hub 2 can be seen in a perspective view in this representation of the mixing tool 1. An industrial mixing machine can be operated with a mixing tool 1, as described above, for mixing mixed material. The mixing time for a mixing process can be reduced if, instead of a single mixing tool 1, two mixing tools of this type are used, which then form a mixing tool set. It is also conceivable to design a mixing tool set with more than two mixing tools. A Mixing tool set, made up of two mixing tools 1, 1.1, is shown in FIG. 4 in a perspective view. In this mixing tool set 11, both mixing tools 1, 1.1 are oriented in the same direction to one another, but offset by 90 degrees on a tool shaft of a mixing machine, which is otherwise not shown in detail. Such an assembly is made possible by the two feather key receptacles 4, 4.1, which are introduced into the shaft bushing 3 of the hub 2.

In addition to the two mixing tools 1, 1.1, the mixing tool set 11 of the exemplary embodiment in FIG. 4 also has a ground clearing tool 12. This sits together with the two mixing tools 1,

1.1 on the same tool shaft. The floor-clearing tool 12 be found in the immediate vicinity at a short distance from the bottom of a mixing container, not shown in the figures. The soil clearing tool 12 is inclined (turned on) and serves the purpose of lifting up the mix located in the area of the soil and feeding the mixing tools 1, 1.1. This supports the energy input, since the mixing blade section 7.1 of each mixing tool 1, 1.1 moves material in the direction of the bottom of a mixing container, the material then immediately being picked up again by the rotation of the soil-clearing tool 12 and in the direction of the mixing blades 5,

5.1 of the mixing tools 1, 1.1 is moved.

FIG. 5 shows a further mixing tool set 11.1 in a perspective representation corresponding to that of FIG. 4. In this mixing tool set, the mixing tools 1, 1.1 are mounted on the tool shaft with their side facing upward in FIG. 4, so that when the mixing tool set 11.1 is driven to the left, the rounded ends of the mixing vane sections 7, 7.1 point in the direction of rotation.

Of course, a configuration of a mixing tool set 11.2 is also possible, in which one of the two mixing tools - the mixing tool 1 - points with its rounded end face in the direction of rotation, while the other mixing tool - the mixing tool 1.1 - with its face having the crescent-shaped section in the direction of rotation has a left-handed drive. This mixing tool set 11.2 is shown in FIG. 6. In this mixing tool set 11.2, the upper mixing tool 1 is rotated or turned by 180 degrees about its longitudinal axis relative to the lower mixing tool 1.1. With such an arrangement, additional energy can be introduced into the mix, which is why such a mixing tool arrangement is suitable for mix in which more shear is to be introduced.

FIG. 7 shows an example of a mixing container 13 in which the mixing tool set 11 from FIG. 4 is inserted. For the sake of simplicity, other components such as the drive and the like are not shown. The front edge 14 of the soil-clearing tool 12 pointing in the direction of rotation in the case of a left-turning drive is adapted to the bottom contour and the transition contour into the side wall of the mixing container 13.

Due to the described position of the mixing vane sections 7, 7.1 of the mixing tool 1, material is guided away from the side wall of a mixing container when the mixing tool 1 is rotating and is thrown off in the direction of the axis of rotation. This allows the use of such a mixing tool in an industrial mixing machine which has a mixing head to which a mixing container with the mix contained therein can be connected.

FIG. 8 shows the mixing head 15 of such a mixing machine, drive units and the further components of the mixing machine also not being shown in this illustration. In this exemplary embodiment, the mixing head 15 is designed as a disk and has in its radial edge area several seals of different diameters, arranged concentrically to one another. Thus, mixing containers with different diameters can be connected to the mixing head 15 of the mixing machine, which is otherwise not shown in detail. Due to the above-described material conveyance during operation of the mixing tool 1, 1.1, the mix to be found in such a mixing container can also be mixed as intended if the mixing tool or tools 1, 1.1 does not extend radially extend to the immediate inner wall of the container. In the exemplary embodiment shown in FIG. 8, two mixing tools 1, 1.1 corresponding to the mixing tool set 11 are seated on the tool shaft 16. The mixing material contained in a mixing container connected to the mixing head 15 is mixed in an overhead position in which the mixing tool set is located 11 is at the bottom. The mixing head 15 itself is pivotally mounted on a frame of the mixing machine. In order to support the mixing process, a pendulum movement can thus be carried out with the mixing container connected to the mixing head 15. A clearing tool is therefore not absolutely necessary in this embodiment.

The description of the invention in the description of the figures and also in the general description part makes it clear that the described mixing tool introduces relative movements in different directions into the material to be mixed by the design of its mixing tool blades with the setting of its mixing blade sections. This results in additional turbulence in the mix flow, which is why the mix temperature rises correspondingly quickly and a mixing process with heat input can be completed in a short time.

The invention has been described using exemplary embodiments. Without departing from the scope of the applicable claims, numerous further configurations result for a person skilled in the art without these having to be explained in detail within the scope of these explanations.

Reference list

1 .1 mixing tool

2 hub

3 shaft bushing

4, 4. Key holder

, 5.1 Mixing tool blades

, 6.1 connecting section

, 7.1 Mixing wing section

8 bending line

9 bending line

9.1 line

10 mixing wing tip

1 1 Mixing tool set

12 Ground clearing tool

13 mixing containers

14 front

15 mixing head

16 tool shaft

D axis of rotation

M median longitudinal plane

Claims

1. Mixing tool for an industrial mixing machine for mixing a typically consisting of several components

Mixed material with a hub (2), with means for connecting the mixing tool (1, 1.1) to a rotationally driven mixing tool shaft (16) and with at least two identical mixing tool blades (5, 5.1), characterized in that the mixing tool blades (5, 5.1) one each at the level of

Have hub (2) in each case with respect to the longitudinal extent of the axis of rotation (D) opposite angled connecting section (6, 6.1), on each of which extends in a radial direction from the hub (2), opposite the plane of the hub ( 2) in the direction of rotation and in the radial direction and opposite to the connecting section (6, 6.1) in opposite directions ge inclined mixing wing section (7, 7.1) is formed.

2. Mixing tool according to claim 1, characterized in that the mixing tool (1, 1.1) two each other to the axis of rotation (D)

Hub (2) has opposite mixing tool blades (5, 5.1).

3. Mixing tool according to claim 1 or 2, characterized in that the mixing wing sections on as along a radially extending end face at least along a section as

Cutting edge.

4. Mixing tool according to claim 3, characterized in that the mixing wing sections are blunt on their end face opposite the cutting edge.

5. Mixing tool according to one of claims 1 to 4, characterized in that an end face of the mixing wing sections (7, 7.1) is designed sickle-shaped in at least one section.

6. Mixing tool according to one of claims 1 to 5, characterized in that the mixing blade sections (7, 7.1) end in the radial direction in a mixing blade tip (10) and, seen in a development, opposite to the one mixing blade section (7, 7.1) cutting Central longitudinal plane (M) are guided with an asymmetrical contour, whereby the mixing wing tips (10) are spaced apart from the respective central longitudinal plane (M).

7. Mixing tool according to claim 6, characterized in that the transition from the mixing wing tip (10) in the with respect to the longitudinal axis plane (11) opposite end face is rounded out leads.

8. Mixing tool according to one of claims 1 to 7, characterized in that the mixing wing sections (7, 7.1) are set in opposite directions with respect to the direction of rotation.

9. Mixing tool according to one of claims 1 to 8, characterized in that the employment of the mixing wing sections (7, 7.1) is provided in the direction of rotation at 10 to 15 degrees.

10. Mixing tool according to one of claims 1 to 9, characterized in that the mixing wing sections (7, 7.1) are connected at an angle to the connecting sections (6, 6.1).

11. Mixing tool according to claim 10, characterized in that a bending line (9), on which the mixing wing sections (7, 7.1) are angled relative to the connecting sections (6, 6.1), against a cross-sectional line through the mixing wing section (7, 7.1) is inclined.

12. Mixing tool according to one of claims 1 to 11, characterized in that the hub (2) has a shaft bushing (3) with at least one feather key receptacle (4, 4.1).

13. Mixing tool according to claim 12, characterized in that the hub (2) has two feather key receptacles (4, 4.1) which are arranged at an angular distance of 90 degrees from one another and have the same contour.

14. Mixing tool set, comprising two mixing tools (1, 1.1) after

Claim 13.

15. Mixing machine with a rotationally driven tool shaft (16) and with a mixing tool set (11, 11.1, 11.2) according to claim 14, characterized in that the two mixing tools (1, 1.1) of the mixing tool set (11, 11.1, 11.2) seen at 90 degrees in the direction of rotation offset from one another on the tool shaft (16).

16. Mixing machine according to claim 15, characterized in that the two mixing tools (1, 1.1) with an axial distance to each other are attached to the tool shaft (16), so that each mixing wing section (7, 7.1) is at a different height in relation to the Axis of rotation (D).

17. Mixing machine according to claim 15 or 16, characterized in that on the tool shaft (16) on the bottom with respect to the un direct mixing tool of the mixing tool set (11) sits a soil clearing tool (12).