EP2937137B1 - Mixing machine - Google Patents

Description

The invention relates to a mixing machine, comprising a mixing head equipped with one or more elements for connecting the same to a container containing a mix for forming a mixture containing closed mixing container, which mixing head is pivotally mounted relative to a frame such that the mixing head and Container comprising mixing container for performing the mixing process is pivotable, and comprising a first carried by the mixing head, the bottom of the mixing head clearing, rotatably driven tool for generating a low-energy flow for supplying mixed material contained in the mixing container to at least one carried by the mixing head second, only a fraction of the mixed material contained in the mixing container each detecting tool with a Mischgutförderrichtung in a transverse direction to the Mischgutbewegung generated by the first tool, which at least one second tool is responsible for the actual mixing work and is located within the trajectory of the soil clearing first tool.

Such mixing machines are industrial mixers which are used for mixing, in particular, bulk material, typically powdered bulk material, such as is required for producing plastic granulate mixtures or else in the paint industry. These mixing machines have a comparison with a frame pivotally mounted mixing head, which also serves to seal a container containing the mix, which is connected to the mixing head for the purpose of mixing therein. After the container has been connected to the mixing head, a closed mixing container is formed from the mixing head and the container containing the mix. For the purpose of connecting the container to the mixing head, the mixing head has one or more connecting elements, for example a peripheral flange. Due to the fact that in these mixing machines a container containing the mix is connected to the mixing head, these mixers are also addressed as a container mixer. The mixing head itself is pivotally mounted relative to the frame of the mixing machine, so that the mixing with respect to the mixing head in an overhead position, in which the mixing head at the bottom and the container connected thereto are located at the top.

Such known container mixers have a device for generating a Mischgutstroms. As Mischgutstromerzeugseinrichtung used in conventional mixers axially mounted in the mixing head tool, driven by a motor rotatorisch. Such a tool has several projecting in the radial direction of the drive shaft wings, so that it is designed in the manner of a propeller. Such a container mixer is off EP 0 225 495 A2 known. Further, it can be provided to arrange a plurality of such tools on the drive shaft. In the prior art mixers, this tool serves as a mixing tool and generates a Mischthrombus during operation of the mixer with the mix contained in the mixing container. By mixing or mixing the mix is thrown in an axial region upwards, deflected outward in the radial direction and then returned due to gravity on the inner wall of the container to the tools. By the mixing tools described above, a Mischgutstrom is generated, in which the entire, located in the mixing vessel mix is included. Due to the acceleration of the mixed material on the one or more mixing tools and the turbulence contained in the Mischgutstrom the mixing process takes place.

In industrial mixing machines, the aim is to achieve the desired mixing in the shortest possible time. Even if with higher tool speeds basically a thorough mixing in a shorter time is possible, as with slower rotating tools is generally considered that in the material to be mixed not too much heat may be entered. Especially when mixing plastic granules is to pay attention to this, otherwise the individual granules particles baked together and / or can also cake on the tools. For this reason, in the mixing machines described above, the mixing time is limited in order to prevent the mixed material from being too much heated by the drive of the mixing tool or tools and the jacket friction of the particles on the inner wall of the container.

A container mixing machine, which does not have the disadvantages indicated for the above-described mixing machines, is out EP 2 460 581 A1 known. This previously known blender works on a different concept. A slowly rotating bottom clearing first tool is used to deliver mix to a second tool carried by the mixhead. The first tool hardly introduces energy into the mix. The second tool is responsible for the actual mixing process. The mixed material stream produced by the second tool runs in the transverse direction to the conveying mixture stream provided by the first mixing tool. Since in this mixing machine, the actual mixing process is performed only by the second mixing tool and this is due to the conception only a fraction of the mixed material in the mixing container is detected, this mixing tool can work fast-rotating to a higher or high energy secondary Mischgutstrom - the actual for mixing of the mixed material produced Mischgutstrom - to produce. Since only a fraction of the mixed material is detected by the second tool and introduced into the secondary mixed material flow and the mixed material introduced therein remains therein only for a short time, the heat input into the mix is only slight. Finally, the mixed material particles which have been led out again from the secondary mixed material stream can cool down before they are again supplied by the first tool to the second tool for further mixing.

The soil clearing conveyor tool in this prior art mixing machine is designed in the manner of a helical segment, whose trajectory is passed in the radial direction on the outside of the second tool. The helical segment is designed so that the mixed material cleared from the bottom of the mixing head is transported away from the bottom. This previously known mixing machine has two helix segments diametrically opposite one another with respect to the axis of rotation.

Even if a considerable reduction of the energy and thus of the heat input in the process of mixing could already be achieved with this previously known mixing machine, it would nevertheless be desirable to if the heat input could be further reduced.

Based on this discussed prior art, the invention is therefore the object of developing a mixing machine of the type mentioned in such a way that the energy input relative to a EP 2 460 581 A1 become known mixing machine could be further reduced.

This object is achieved according to the invention by an aforementioned, generic mixing machine in which the at least one first tool is formed like a shovel and in the direction of rotation of the tool with its pointing in the direction of rotation edge in the radial direction outwards and in which the first tool a first lower-level blade section , an adjoining second wall clearing blade section and an opening facing away from the wall remote end, through which the second tool is passed during rotation of the first tool.

If the terms "soil-clearing" and "wall-clearing" are used in this context, this is to be understood as a mixture material movement away from the floor or from the wall. This does not necessarily mean that the tool must contact the bottom or wall of the mixing head.

In this mixing machine is different from the EP 2 460 581 A1 known mixing machine designed at least a first tool in the manner of a blade, which is employed with respect to the direction of rotation of the tool with its pointing in the direction of movement conclusion to the wall of the mixing head and thus in the direction of the axis of rotation. The blade itself is divided into a first lower-level blade section and an adjoining wall-clearing blade section. In addition, the blade has a tool recess through which the second tool is passed during a rotational movement of the first tool. This tool recess is open to her due to the employment of the blade wall remoteness conclusion. Preferably, the lower-level blade section is employed for performing a ground-clearing function, with respect to the plane of the second blade section. Due to the evacuating function of the second blade section, mixed material is conveyed by the wall of the mixing head in the direction of the hub or shaft of the first tool during a rotational movement of this tool. If the first tool with its blade passes the second tool, mixed material is conveyed in the same direction towards the second tool. This conveying mixed material away from the wall of the mixing container and towards the hub requires that in the mixing position of the mixing container by the moving away moving away of mix from the wall of the mixing head from above mixed material falls towards the bottom of the mixing head and thus to the second tool , For this purpose, the scoop-like first conveying tool is preferably carried out in the manner of a paddle or rudder, wherein the falling mixture falls leeseitig.

Investigations have shown that in this concept, the rotational speed of the first tool compared to the required rotational speed of EP 2 460 581 A1 can be reduced by up to 50% and more without having to extend the mixing time of a batch to achieve the same mixing result. The lower rotational speed of the first tool not only reduces the heat input but also the energy consumption of the mixing machine. Of particular advantage in this mixing machine concept is also that the bottom closer, preferably bottom clearance designed blade section and the wall clearing blade section can be equipped with resilient wiper lips, which contact the floor or the mixing head inner wall so that wall or Bodenanbackungen not or at most only very much are subordinate to observe. According to a simpler and faster cleaning of the interior of the mixing head after a batch change, if in a subsequent batch a different material to be mixed than in the previous batch.

The angle of attack of the first tool with respect to a radial is preferably between about 50 degrees and about 70 degrees. Particularly good results could be achieved with an angle of about 60 °.

In order to produce a uniform wall-clearing Mischgutbewegung over the height of the scavenging blade section, whose front, near-wall edge over the height of the wall or the wall portion is executed at an equal distance to this. This wall clearing blade section is made longer with respect to its direction of extension in the direction of movement than the adjoining to the bottom of the mixing vessel preferably bottom clearance blade section. The wall clearing blade section may be designed in the manner of a plate. It is also possible to carry this out with a curvature directed in the direction of the axis of rotation or also a first area adjoining the wall-clearing edge in the manner of a plate and an adjoining area which is curved in the above-mentioned manner or projecting inwardly projecting in relation to this plane to provide.

In a preferred development of a mixing machine designed in this way, a ground-clearing counter-tool is connected to the shaft of the first tool. This counter-tool is employed with respect to a radial, and with such an angle that the mixture is detected by this tool moves away from the hub or the shaft. The first tool and the counter tool are matched to one another, so that the mixed material captured by these is moved towards the second tool. Consequently, these tools are designed so that they can be passed with the closest possible distance to the second tool in the course of its rotational movement.

According to a further preferred embodiment, it is provided that two diametrically opposed first tools and two diametrically opposite counter tools are provided. Each first tool is in a radial arrangement to a counter tool. These then form a forced supply channel for the particularly effective supply of mix to the responsible for the actual mixing process mixing tool - the second tool.

Depending on the desired mixture or mixture to be mixed This may be a different tool. Typically, the second mixing tool will be a bladed equipped tool driven at higher or higher rotational speeds. In any case, the speed of this tool exceeds the rotational speed of the first tool by a multiple. A mixing machine with such a mixing head can also be equipped with several second mixing tools, also designed differently. If it is desired to disperse the mixed material, a tool equipped with wing tools is used as the second tool - as the actual mixing tool. If a homogenization of the mix is provided, a second, designed in the manner of a screw conveyor mixing tool can also be used. When using in each case one of these mixing tools in a single mixing head can then be adjusted by appropriate individual control of these tools, the mixing result with respect to the variables "dispersion" and "homogenization".

Fig. 1:

eine schematisierte perspektivische Ansicht einer Mischmaschine mit einem an den Mischkopf derselben angeschlossenen, ein Mischgut enthaltenden Behältnis in Mischstellung,

Fig. 2:

eine perspektivische Einsicht in den Mischkopf der Mischmaschine der Figur 1 aus einer ersten Blickrichtung,

Fig. 3:

eine perspektivische Einsicht in den Mischkopf der Mischmaschine der Figur 1 aus einer anderen Blickrichtung,

Fig. 4:

eine Draufsicht auf den Mischkopf der Figuren 2 und 3 und

Fig. 5:

eine perspektivische Einsicht in den Mischkopf mit durch Blockpfeile angedeuteter Mischgutbewegung.

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

Fig. 1:

a schematic perspective view of a mixing machine with a connected to the mixing head thereof, a mixture containing container in the mixing position,

Fig. 2:

a perspective insight into the mixing head of the mixing machine of FIG. 1 from a first perspective,

3:

a perspective insight into the mixing head of the mixing machine of FIG. 1 from a different perspective,

4:

a plan view of the mixing head of Figures 2 and 3 and

Fig. 5:

a perspective insight into the mixing head with indicated by block arrows Mischgutbewegung.

A mixing machine 1 for industrial purposes has a frame 2, on which a mixing head 3 is pivotally mounted. The pivot axis of the Mixing head 3 is denoted by the reference symbol S in FIG. 1 indicated. About a drive 4, the mixing head 3 is pivotable about its pivot axis S at least 180 °. In the illustrated embodiment, the pivotability of the mixing head 3 serves the purpose that in its opposite to the representation in FIG. 1 rotated 180 ° position a mixed goods container 5 as a mix containing container moved to the mixing head 3 and can be connected to this, then the unit formed from Mischgutcontainer 5 and mixing head 3 - the actual mixing container - in the FIG. 1 shown mixing position of the mixing head 3 to pivot. In this position, the mixing head 3 of the mixing machine 1 is at the bottom, so that the mix contained in the Mischgutcontainer 5 falls on the arranged in the mixing head 3 tools.

The mixing head 3 of the illustrated embodiment has two tools, which are each driven by an electric motor in the illustrated embodiments. A first electric motor 6 serves to drive a first tool unit; a second electric motor 7 serves to drive a second tool.

FIG. 2 The mixing head 3 has a container part 8 with a bottom 9 and a cylindrical wall section 10 formed thereon. The transition from the bottom 9 into the wall section 10 is executed to form a radius. The container part 8 is enclosed in a housing 11. The housing 11 carries at its free end a coupling flange 12 against which a complementary designed coupling piece of the mixed goods container 5 rests after connection to the mixing head 3. This is used in the illustrated embodiment, the coupling flange 12 as an element for connecting a container containing a mix, here: the Mischgutcontainerers 5 to the mixing head. 3

From the electric motor 6, two tools 13, 13.1 are rotationally driven as a first tool unit. In the context of these embodiments, these tools are also addressed as first tools 13, 13.1. The shaft 14 of the electric motor 6 passes through the bottom 9 of the container part eighth The axis of rotation of the shaft 14 is thus aligned with the longitudinal axis of the mixing head 3. Connected to the shaft 14 are by means of one arm 15, 15.1 the tool 13 and 13.1. Next, the tool 13 will be described. The relevant statements apply equally, unless otherwise stated, also for the tool 13.1.

The tool 13 is executed in its functionality in the manner of a blade and employed with respect to the direction indicated by the block arrows direction of rotation. The employment of the located on the arm 15 tool 13 is starting from an arrangement of the tool 13, with this occupies an angle of 90 ° with the radial R formed by the conveying arm 15, with its pointing in the direction of rotation front edge in the radial direction to the outside directed towards the wall section 10. Due to this employment, this tool 13 is wall clearing. Consequently, during a rotary movement of the tool 13, this mixture will be conveyed from the wall section 10 in the direction of the shaft 14. The blade-like tool 13 is subdivided into a ground-level first blade section 16 and an adjoining second blade section 17. In addition to the above-described radial adjustment of the tool 13, the first blade portion 16 is also employed with respect to the plane of the second blade portion 17, in the illustrated embodiment at about 25 ° with its facing edge 18 of this blade portion 16 in the direction of rotation. Because of this embodiment of the first blade section 16, this is ground-clearing in order to convey away mix material in the direction of the bottom 9 of the mixing head 3. In the illustrated embodiment, moreover, the angle of employment of this blade portion 16 relative to the radial, compared with the angle of attack of the second blade portion 17 is slightly larger, in the illustrated embodiment about 15 °. The bottom-clearing blade section 16 adjoins a recess 19. The recess 19 is introduced into the tool 13 from its end 20 pointing counter to the direction of rotation. The bottom closer first blade portion 16 is designed with respect to its height compared to the height of the second blade portion 17 is significantly lower.

In the embodiment shown in the figures, a wiper lip 21 is arranged on the pointing in the direction of rotation front edge 21 of the wall clearing blade portion 17 in its substantially over the height of the wall portion 10 extending portion. This is made of an elastic material and extends from the edge 22 to the wall portion 10 zoom, so contacted them. The wiper lip 21 acts with a certain bias against the surface of the wall portion 10 and serves for stripping of possibly adhering thereto Mischgutpartikeln. In the embodiment of the mixing machine according to the figures, only the tool 13 carries such a wiper lip 21. It is not necessary that both tools 13, 13.1 carry a wiper lip at this position. The tool 13 is equipped with such a wiping lip 21, preferably when PE or PP material is mixed in the mixing head 3.

In the radial direction inwardly with respect to the first, bottom-clearing blade portion 16 of the tool 13 is also driven by the shaft 14, a counter-tool 23. The counter-tool 23, since connected to the shaft 14, rotatably driven in the same direction of rotation, as the tool 13. The counter-tool 23 is likewise a ground-clearing tool which is set in the other direction with respect to the direction of rotation in the same way as the tool 13. In the illustrated embodiment, a wiper lip 24, which serves the same purpose, is connected to the counter-tool 23 Due to the arrangement of the tool 13 and the counter tool 23 is mixed material on the one hand by the wall portion 10 in the direction of the shaft 14 and the other by means of the counter tool 23 from the shaft 14 back to ground Direction to the wall portion 10 moves. By the counter-tool 23 an accumulation of not involved in the mixing process mix in the shaft 14 is prevented. Since in the illustrated embodiment, two first tools 13, 13.1 are provided, two counter tools 23, 23.1 are also provided.

The electric motor 7 of the mixing head 3 is used to drive a second tool 25. This also passes through the ground with its shaft. 9 the container part 8 and the in FIG. 2 undetectable bottom of the housing 11. The shaft and thus the axis of rotation of the tool 25 is inclined to the axis of rotation of the shaft 14, as this is clearly visible in the figures. The mixing tool 25 is a mixing tool known per se with a plurality of mixing blades sitting one above the other on the shaft. The actual mixing work is carried out in an operation of the mixing machine 1 with this operated at high or higher rotational speed tool 25. The first tools 13, 13.1 and the counter-tools 23, 23.1 cooperating therewith serve for feeding mixed material to the mixing tool 25 as well as for removing mixing material captured by the mixing tool 25.

From the in FIG. 3 with respect to the first tool 13.1 recognizable therein, it can be seen that its first, bottom-clearing blade section 16.1 is likewise provided with a wiping lip 26, in a manner as already described above for the wiping lip 21 is described. The wiper lip 26 is in the illustrated embodiment under bias on the bottom 9 of the container part 8 and extends over the bottom 9 with the wall portion 10 connecting inner radius to the bottom wall portion 10 into it.

The representations of the mixing head 3 in the Figures 2 and 3 show that the first tools 13, 13.1 have a greater extent in the direction of the longitudinal axis of the mixing head 3 than the wall portion 10 is high. Consequently, these tools 13, 13.1 protrude into a mixed goods container 5 connected thereto.

FIG. 4 shows in a plan view of the bottom 9 of the mixing head 3, the radial alignment of the arms 15, 15.1, starting from the shaft 14. Registered in this illustration is the radial formed by the arms 15, 15.1 in this embodiment R. The tool 13 is connected to the End of the arm 15 connected. The angle of attack is indicated therein by α therein. It is clear from this representation of the mixing head 3, the opposing employment of the counter tool 23 with respect to the tool 13 and the consequent, converging movement of the mixed material in a rotational movement of the shaft 14 with the The same applies of course to the tools 13.1, 23.1, which are opposite the tools 13 and 23 with respect to the shaft 14. In FIG. 4 is the material movement in the area of the tools 13, 13.1 and 23, 23.1 schematized with block arrows and the direction of rotation of the tools 13, 13.1 and 23, 23.1 indicated by arrows. This apart material movement causes the material to be mixed particularly effectively with the second tool 25 provided for the actual thorough mixing of the material.

FIG. 5 again shows a perspective insight into the mixing head 3. In this is schematically indicated on the basis of the tool 13, the above-described falling Mischgutbewegung during a rotational movement of this first tool 13.

In an embodiment, not shown in the figures, the previously discussed counter tools are executed, as this has been explained in principle to the first tools 13, 13.1. In this embodiment, the counter tools in addition to the described soil clearing tool section via an adjoining second wall clearing tool section. Between the two tool sections as well as in the tools 13, 13.1 is a recess through which the second tool can be passed. The wandräumdende tool section, which has at least one of the counter tools is also employed in opposite directions to the first tool. As a result of this wall-clearing tool section of the counter-tool, mixed material is moved away from the shaft 14 in the radial direction as in the first tool, and the same mixed-material trapping effect sets in towards the bottom of the mixing head, as previously described with reference to the tool 13 with respect to the outer wall section 10 of FIG Mixing head 3 is described. However, the mix was moved radially outward by the shaft 14.

The invention has been explained with reference to concrete embodiments described. Without departing from the scope of the applicable claims, numerous further embodiments for a person skilled in the art will make the invention come true.

LIST OF REFERENCE NUMBERS

1

mixer

2

frame

3

mixing head

4

drive

5

Mischgutcontainer

6

electric motor

7

electric motor

8th

container part

9

ground

10

wall section

11

casing

12

coupling flange

13, 13.1

first tool

14

wave

15, 15.1

poor

16, 16.1

vane section

17

vane section

18

edge

19

recess

20

graduation

21

wiping lip

22

edge

23, 23.1

counter-tool

24

wiping lip

25

second tool

26

wiping lip

R

radial

S

swivel axis

α

angle of attack

Claims (13)

1. Mixing machine, comprising a mixing head (3), equipped with one or a plurality of elements for connecting the same to a container (5) containing a mixture for configuring a closed mixing vessel containing the mixture, which mixing head (3) is mounted so as to be able to pivot relative to a frame (2) in such a way that the mixing vessel formed from the mixing head (2) and the container (5) can be pivoted for carrying out the mixing process, further comprising a first rotationally driven tool (13, 13.1) carried by the mixing head (3) and clearing the floor (9) of the mixing head (3) to generate a low-energy delivery flow for feeding mixture contained in the mixing vessel to at least one second tool (25) carried by the mixing head (3) and holding only a fraction of the mixture contained in the mixing vessel with a mixture feeding direction in a direction perpendicular to the mixture movement generated by the first tool (13, 13.1), the at least one second tool (25) being responsible for the step of mixing and being located within the movement path of the floor-clearing first tool (13, 13.1), characterised in that the at least one first tool (13,13.1) is paddle-like in configuration and in the direction of rotation of the tool (13,13.1) is set with its edge (22) that points in the direction of rotation radially outward, and in that the first tool (13, 13.1) comprises a first paddle section (16, 16.1) that is nearer to the floor, a contiguous second wall-clearing paddle section (17) and a recess (19) which is open to its termination farther away from the wall, and through which recess the second tool (25) is guided when the first tool (13, 13.1) is rotated.
2. Mixing machine according to claim 1 characterised in that the angle of incidence (α) of the first tool (13, 13.1) is between 50°und 70° relative to the radial line (R) which runs through said tool.
3. Mixing machine according to claim 2 characterised in that the angle of incidence (α) of the first tool (13, 13.1) is 60° relative to the radial line (R) which runs through said tool.
4. Mixing machine according to any one of claims 1 to 3 characterised in that the angle of incidence (α) in both paddle sections (16, 16.1, 17) is the same.
5. Mixing machine according to any one of claims 1 to 3 characterised in that the angle of incidence of the first paddle section (16, 16.1) is less than the angle of incidence of the second paddle section (17).
6. Mixing machine according to any one of claims 1 to 5 characterised in that the second paddle section (17) comprises a greater radial extension and a greater extension in the direction of rotation of the first tool (13, 13.1) than the first paddle section (16, 16.1).
7. Mixing machine according to any one of claims 1 to 6 characterised in that, relative to the plane of the second paddle section (17), the first paddle section (16, 16.1) is set with its side which points in the direction of rotation of the tool (13, 13.1) facing away from the floor (9) of the mixing head (3).
8. Mixing machine according to claim 7 characterised in that this angle of incidence of the first paddle section (16, 16.1) is between 25° and 45°relative to the plane of the second paddle section (17).
9. Mixing machine according to any one of claims 1 to 8 characterised in that the floor-clearing edge of the first paddle section (16.1) is equipped with a flexible stripping lip (26) which contacts the floor (9) of the mixing head (3).
10. Mixing machine according to any one of claims 1 to 9 characterised in that the wall-clearing edge (22) of the second paddle section (17) is equipped with a flexible stripping lip (21) which contacts the wall (10) of the mixing head (3).
11. Mixing machine according to any one of claims 1 to 10 characterised in that at least two first tools (13, 13.1) spaced at the same angular distance apart from one another are provided.
12. Mixing machine according to any one of claims 1 to 11 characterised in that, interacting with the at least one first tool (13, 13.1), a floor-clearing counter-tool (23, 23.1) driven together with the first tool (13, 13.1) is provided on the latter's shaft (14), said counter-tool (23, 23.1) being arranged inversely to the respective first tool (13, 13.1).
13. Mixing machine according to claim 12 characterised in that as well as a floor-clearing tool section, the counter-tool has adjacent thereto a wall-clearing tool section and so is essentially configured like the first tool but with an inverse angle of incidence.

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