WO2002062547A1

WO2002062547A1 - Mixing tool for a mixing device

Info

Publication number: WO2002062547A1
Application number: PCT/EP2002/001044
Authority: WO
Inventors: Wolfgang Zenner
Original assignee: Wolfgang Zenner
Priority date: 2001-02-03
Filing date: 2002-02-01
Publication date: 2002-08-15
Also published as: DE10105007A1; DE10105007C2

Abstract

The invention relates to a mixing tool comprising a mixing beater, which comprises two mixing rods that are substantially parallel to the rotational axis of the beater and located at a distance from one another and a conveyor spiral that is arranged on said rods. One end of the beater is connected to a drive motor and the other end is connected to the conveyor pump. The conveyor spiral is located in the vicinity of a conveyor funnel which tapers towards the conveyor pump and is located above a mixing zone, into which a conduit for introducing water opens. The aim of the invention is to configure a mixing tool of this type in such a way that a mixture devoid of lumps, which is as homogenous as possible, can be produced in a shorter time. To achieve this, an additional beater (6, 41) comprising mixing elements (9, 45), which are positioned in the space between the mixing rods (3, 30), is secured on the mixing beater (1, 31). The drive rod (8, 40) of said additional beater lies parallel or at an acute angle to the rotational axis (A) of the mixing beater (1, 31) and has a rotationally fixed drive wheel (10, 20, 21, 25, 43) that forms a gearing together with a gearing member (11.1, 16, 19, 23, 35), which is fixed or configured on the mixing device. Said drive wheel is caused to rotate during the rotational displacement of the mixing beater (1, 31).

Description

Mixing tool for a mixing device

The invention relates to a mixing tool for a mixing device for powdery or fine-grained mix for mixing with water, in particular for a mixing device arranged in a cleaning machine.

Plastering machines in use with a mixing device in which powdery or fine-grained mix is mixed with water have a funnel-shaped conveying container for the powdery mix, a mixing zone connected to the funnel exit down into which the water is fed, and a mixing whisk as a mixing tool which detects the mixed material entered through an opening in the conveying container and brings it into the mixing zone. The mixing mixer, in turn, engages with a drive motor on the delivery container side and with a feed pump on the mixing zone side, which pumps the mixed material into a pipeline. The feed pump is usually a screw pump and rotates simultaneously with the mixer.

The mixing paddle has two mixing rods arranged in the mixing zone at a distance parallel to its axis of rotation, which extend as far as the feed pump and are connected on the feed pump side by a crossbar that has a centering pin and is also designed as a driving element for the feed pump, which also ensures the stability of the mixing paddle. The mixing rods are connected to one another at their upper end in the region of the feed hopper outlet with a crosspiece, on which a drive rod guided through the feed hopper is fixedly arranged, which is in engagement with the drive shaft of the drive motor. Arranged around this drive rod is a mixing spiral which is firmly connected with its end on the delivery pump side to one of the two mixing rods and extends spirally and opens upwards into the delivery funnel.

The mix fed into the feed hopper is caught by the rotating spiral and, with its support, is brought down into the mixing zone and mixed there with water which is introduced through a lateral pipeline. However, depending on the mix and the amount of water introduced, clumps and consequently blockages can occur, in particular as a result of insufficient mixing, so that the mixing and conveying process of the mixed material is considerably disrupted. Consequences are increased wear of the mixing device, an increased consumption of additives with the intended addition of such and also micro cracks in the applied facade plaster due to an inhomogeneous mixture. A mixing device with a mixing whisk to increase the effectiveness of the mixing process while largely avoiding clumping is known from DE 197 55 059 C2. This mixing paddle is designed in such a way that the conveyor spiral arranged on the conveyor pump has a pressure surface that detects the material to be mixed and presses in the direction of the mixing zone, and that in the area of the orbit of the mixing rods at least one auxiliary mixing rod is arranged between them and in front of it in the direction of rotation arranged mixing rod has an angular distance of substantially 45 ° to 135 °. Through this additional auxiliary mixing rod, which is arranged so that the mixing zone inside the orbit of the mixing rods remains free of components, it is possible to mix the mixed material accelerated with water and to remove clumping, non-humidified or slightly humidified mixing areas as far as possible , This also prevents blockages in the conveying process of the mixed goods. The respective auxiliary mixing rod is designed over the entire area of the mixing zone, for example also in the form of waves in the plane defined by it and the axis of rotation, and extends on the drive motor side into the area of the conveyor spiral in order to intervene in the mixing process as early as possible and to be able to work over the entire duration of the same.

The object of the invention is to design a mixing tool for a mixing device according to the preamble of claim 1 so that a largely homogeneous mixture free of clumps can be produced with this reduced time expenditure.

This object is achieved in a mixing tool according to the preamble of claim 1 by the characterizing features. Advantageous configurations are listed in the subclaims.

The invention consists in that the mixing tool for a mixing device consisting of a mixing whisk, which has two mixing rods arranged at a distance essentially parallel to its axis of rotation and a conveying spiral arranged thereon, and is connected to another with a drive motor and the other with a feed pump, and one this held additional whisk is formed with stirring elements arranged in the space between the mixing rods. The mixing device has, in a known manner, a feed hopper to be tapered to the feed pump and, below this, a mixing zone into which a pipeline for introducing water opens, the feed spiral being arranged in the area of the feed hopper and the mixing rods of the mixing whisk in the mixing zone. The drive rod of the additional whisk is arranged according to the invention in parallel or at an acute angle to the axis of rotation of the whisk, rotatably supported, and has a rotationally fixed Drive wheel on. This drive wheel forms a transmission with a further gear member formed or fixedly arranged on the mixing device and is driven when the mixing whisk rotates and is set in rotary motion with the drive rod about its axis. The drive motor for the mixing whisk is thus advantageously also the drive motor for the additional whisk. It has been shown that the fact that the additional whisk penetrates and mixes the material to be mixed in the area between the mixing rods of the whisk, depending on the arrangement of the drive wheel to the gear member in the same or in the opposite direction of rotation to the whisk, the mixing process in this area more intensely and clumps are largely excluded. As a result, the mixing rods of the mixing whisk can also be arranged at a smaller distance from the wall of the mixing zone, so that there is also no space for clumping between the mixing zone and the mixing rods. The mixing process is therefore more effective overall and accelerates to a largely homogeneous and free of clumping mixture. Further advantages are better digestion of the mix, in particular mortar, so that mixing can be carried out with a higher bulk density. Due to higher speeds, mixed material, in particular mortar, can be processed with a larger grain, so that the proportion of air pores in the mixture is increased. Due to the homogeneous mixing, the additional consumption of additives is largely reduced. The quality of a facade plaster produced and applied in this way is considerably improved, so that consequential damage to it is largely reduced.

In this case, the wall of the mixing device can serve as a further transmission element of the transmission formed with the drive wheel, on the inner surface of which the drive wheel rests with pressure, ie non-positively, and rolls when the mixing whisk rotates due to the mounting of the additional whisk on the latter. The direction of rotation of the additional whisk is opposite to the direction of rotation of the whisk. In a simple manner, the arrangement can be such that the drive wheel bears against the wall of the feed hopper and rolls off. A further transmission link can also be a cylinder or cone, which is arranged above the mixing rods coaxially to the axis of rotation of the mixing paddle and is fixedly connected to the wall of the mixing device and is therefore fixed and has a central opening for the drive shaft of the mixing paddle, against which the drive wheel with the corresponding running surface bears in a force-fitting manner and rolls when the mixing whisk rotates. The direction of rotation of the additional whisk is the same as that of the mixing whisk. Likewise, a surface formed above the mixing rods in a plane transverse to the axis of rotation of the mixing paddle can serve as the transmission link, on which the drive wheel is frictionally engaged with an inclination to the latter. This surface can be formed on a plate which with the Wall of the mixing device is firmly connected and in which an opening for the drive shaft of the mixing whisk is arranged such that it can rotate freely. The direction of rotation of the additional whisk also corresponds to that of the mixing whisk.

Since the drive wheel lies eccentrically on the plate and rolls non-positively on it, it is advantageous to hold it over hard rubber buffers so that the eccentric movements can be compensated. The drive wheel can also be mounted with hard rubber.

In order to achieve a good frictional connection between the drive wheel and the respective further transmission element, especially with regard to solid components of the components to be mixed, which are deposited between them, it is advantageous if the drive wheel itself is made of hard rubber or at least has a rolling surface made of hard rubber.

However, the drive wheel can also be a gearwheel and the further gear member a cylinder or cone which is arranged above the mixing rods coaxially to the axis of rotation of the mixing paddle and is fixedly connected to the wall of the mixing device and thus fixed and has a central opening for the drive shaft of the mixing paddle and with the gearwheel corresponding gearing. The toothing can be designed as an external toothing (direction of rotation of additional whisk and mixing whisk is the same) or inner toothing (direction of rotation of the additional whisk opposite to that of the mixing whisk) and the drive wheel can be arranged accordingly, whereby an internal toothing requires a hollow cylinder or cone.

The stirring elements of the additional whisk are preferably at least two stirring rods arranged essentially parallel to one another, which are connected at one end to the drive rod and at the other to one another.

In a further developed embodiment, the mixing rods are detachably and thus interchangeably fastened on a driver plate which is connected to the drive shaft of the mixing whisk and is arranged below the transmission. The drive rod for the additional whisk is guided through this driver plate and is also stored in it. The stirring elements of the additional whisk arranged below the driver plate are also detachably attached to the drive rod. This version is independent of the type of transmission, so that basically all of the above-described transmission designs can be used. The driver plate is welded to the drive shaft in a simple manner. The mixing rods are expediently screwed to the driver plate and the stirring elements of the additional whisk to its drive rod, since a screw connection is very firm on the one hand and can be detached easily on the other hand.

In order to be able to better cope with the harsh operating conditions of the mixing tool and to reduce the wear of gear links, the gear and the driver plate are encapsulated, i.e. housed in a gear housing fixed to the mixing device, the driver plate being rotatably held on the gear box and at the same time seals the gearbox housing on the mixing rod and stirring element side. The drive shaft for the mixer can also be mounted on the gearbox. As a result, this can be carried out with the transmission and the drive shaft as a separate structural unit, which can also advantageously be arranged detachably on the mixing device.

The invention is explained below using exemplary embodiments. The accompanying drawings show, largely schematically:

1a: a mixing tool in a main view,

1 b: this in a side view,

2: the mixing tool, assembled in a mixing device,

3a: the mixing device with a further embodiment of a mixing tool,

3b: a plan view of a holder for driving an additional whisk,

Fig. 4: a third embodiment of a mixing tool and

Fig. 5: a fourth embodiment of a mixing tool.

6a: the mixing device with a fifth embodiment of a mixing tool and

Fig. 6b: a detachable holder for the mixing rods in a side view, rotated by 90 ° compared to Fig. 6a. 1a and 1b is a mixing tool with a mixing paddle 1, which has a drive shaft 2 and two mixing rods 3 arranged at a distance essentially parallel to its axis of rotation A and a conveyor spiral 4 arranged thereon and at the upper end of the drive shaft 2 with a Drive motor (M), not shown, and at a web 5 formed at the lower end between the mixing rods 3, is connected to a feed pump (P), also not shown, and an additional agitator 6 is formed on the drive shaft 2. This (6) is rotatably mounted on a bearing block 7 arranged fixedly on the drive shaft 2 with a drive rod 8 and fixed in the axial direction, the drive rod 8 being arranged at an acute angle to the axis of rotation A of the mixing whisk 1 and within the conveyor spiral 4 and with two Stirring rods 9, which are formed parallel to one another and formed at their free ends by a web S, protrude into the space given between the mixing rods 3. At the upper end of the drive rod 8 there is a bevel gear 10 which is connected to it in a rotationally fixed manner. Fig. 1b shows the stirring bars 9 in the position shown in Fig. 1a with solid lines and in a position in which the drive rod 8 with the stirring bars 9 is rotated by 90 °, with broken lines.

The mixing device completed with this (FIG. 2) has a feed hopper 11 to be tapered to the feed pump (P) and underneath this a mixing zone 12, into which a water line connection 13 and a further connection 14 for an aggregate open. The conveyor spiral 4 is in the region of the conveyor funnel 11, and the mixing rods 3 are arranged in the mixing zone 12. The bevel gear 10, which is connected to this at the upper end of the drive rod 8 in a rotationally fixed manner, forms a gear for the one with a cone 16 arranged above the mixing rods 3 coaxial to the axis of rotation A and firmly connected to the wall 15 of the mixing device with an external toothing corresponding to the toothing of the bevel gear 10 Drive of the additional whisk 6. The cone 16 is fastened to the wall 15 with three holding brackets 17 (FIG. 3b) arranged at an angle of 120 ° to one another, one of which is shown in FIG. 2, and has a central opening 18 for the Drive shaft 2 on.

When the mixing whisk 1 rotates, which the additional whisk 6 fixedly arranged on the drive shaft 2 inevitably takes part in, the bevel gear 10, which is moved about the fixed cone 16 and is in engagement with its toothing, is rotated in the same direction. The speed of the additional whisk 6 compared to that of the mixing whisk 1 is determined by the transmission ratio from the cone 16 to the bevel gear 10. In the exemplary embodiment described, this transmission ratio is 2: 1, so that the additional whisk 6 is rotated twice as fast as the mixing whisk 1. In the mixing tool shown in FIG. 3a, a hollow cone 19 with a conical internal toothing is formed above the mixing rods 3 coaxially to the axis of rotation A of the mixing whisk 1. The drive rod 8 of the additional whisk 6 is arranged parallel to the axis of rotation A and carries a conical drive wheel 20 which is in engagement with the internal toothing of the hollow cone 19. The direction of rotation of the additional whisk 6 is opposite to that of the mixing whisk 1. 3b shows the holding device for the hollow cone 19 with the three holding brackets 17 and a central opening 18 for the drive shaft 2.

In the embodiment shown in FIG. 4, the wall 11.1 of the feed hopper 11 serves as a gear member for a drive wheel 21 of the additional whisk 6 made of hard rubber. The drive wheel 21 lies non-positively on the feed hopper 11 and rolls on the wall of the whisk when the mixer whirling, wherein the direction of rotation of the drive wheel 21 and thus of the additional whisk 6 is opposite to that of the mixing whisk. The drive wheel 21 is connected to the drive rod 8 via a rubber buffer 22 in order to be able to compensate for eccentric movements.

5 is a plate 23 above the mixing rods 3 with a flat surface 24 formed in a plane transverse to the axis of rotation A of the mixing paddle 1, on which a drive wheel 25 made of hard rubber at an acute angle to this non-positively engages and at a rotational movement of the mixing whisk 1 rolls with its upper edge region. The plate 23 is connected to the mounting brackets 17 via a rubber buffer 26 and the drive wheel 25 to the drive rod 8 via a rubber buffer 27 in order to be able to compensate for eccentric movements. In this embodiment, the direction of rotation of the additional whisk 6 corresponds to that of the mixing whisk 1.

As an alternative to the plate 23, a cylinder or cone which is firmly connected to the wall of the mixing device can also be arranged, on the outer surface of which a drive wheel corresponding to it and made of hard rubber abuts in a force-fitting manner and rolls off when the mixing whisk 1 rotates. The direction of rotation of the additional whisk 6 would then also correspond to that of the mixing whisk 1.

6a and 6b show a further embodiment of a mixing tool arranged in a mixing device. In this case, the mixing rods 30 of the mixing whisk 31 are detachably arranged on a driver plate 33 which is fixedly connected to the drive shaft 32 thereof by a welded connection, for which purpose two axially parallel fastening tabs 34 are welded to this (33), each of which has a mixing rod 30 is screwed on. In this embodiment, the driver plate 33 is rotatably supported below a gear rim 35 designed as a gear member 35 with an internal toothing 36 in a cylindrical gear housing 37 fixed to the mixing device via a bearing L, the gear rim 35 being firmly connected to this (37). The drive shaft 32 is mounted in a hollow cylindrical bearing housing 38 arranged centrally in the gear housing 37 (L), this (32) and the driver plate 33 being sealed on the outside with Simmerrings 39 with respect to the gear housing 37.

The drive rod 40 for the additional whisk 41 is guided through the driver plate 33, rotatably mounted in it (L) and also sealed to the outside with a sealing ring 42 and carries at its gear end a drive wheel 43 which engages with the internal toothing 36 of the ring gear 35 stands, the drive shaft 32 being recessed in the region of the arrangement of the drive wheel 43. The bearing of the drive rod 40 is shown in section in the illustration. The drive rod 40 has a releasable flange connection 44 with fastening screws, so that the stirring rods 45 can also be exchanged in a simple manner. The indicated conveyor spiral 46 is firmly connected to the rear mixing rod 30, which is concealed in FIG. 6a, and is also removed when the same is removed.

When the driver plate 33 rotates, the drive rod 40 rotates around the drive shaft 32 and is thereby set in rotation by the drive wheel 43 which is in engagement with the ring gear 35, the direction of rotation of which is opposite to that of the drive shaft 32.

LIST OF REFERENCE NUMBERS

1 whisk

2 drive shaft

3 mixing stick

4 conveyor spiral

5 bridge

6 additional whisk

7 bearing block

8 drive rod

9 stir bar

10 bevel gear

11 conveying funnels

11.1 wall

12 mixing zone

13 Water pipe connection

14 connection

15 wall

16 cones

17 retaining bracket

18 opening

19 hollow cone

20 Drive wheel 1 Drive wheel 2 Rubber buffer 3 Plate 4 Surface 5 Drive wheel 6 Rubber buffer 7 Rubber buffer 0 Mixing rod 1 Mixing whisk 2 Drive shaft 33 drive plate

34 mounting bracket

35 sprocket

36 internal teeth

37 gearbox

38 bearing housing

39 Simmerring

40 drive rod

41 additional whisk

42 oil seal

43 drive wheel

44 flange connection

45 stir bar

46 conveyor spiral

A axis of rotation

L stock

(M) engine

(P) pump

S footbridge

Claims

PATENT CLAIMS

1.Mixing tool for a mixing device, with a mixing whisk which has two mixing rods arranged at a distance essentially parallel to its axis of rotation and a feed spiral arranged thereon, and is connected at one end to a drive motor and at the other end to a feed pump, the feed spiral being in the region of one arranged to the feed pump to be tapered feed hopper, under which a mixing zone is formed, into which a pipeline for introducing water opens, characterized in that on the mixing beater (1, 31) an additional beater (6, 41) with in the space between the mixing rods (3, 30) arranged stirring elements (9, 45) is held, the drive rod (8, 40) is arranged parallel or at an acute angle to the axis of rotation (A) of the mixing paddle (1, 31) and a drive wheel (10, 20 , 21, 25, 43) which has a Ge with a gear member (11.1, 16, 19, 23, 35) which is formed or permanently arranged on the mixing device forms drives and is set in a rotational movement when the mixing paddle (1, 31) rotates.

2. Mixing tool according to claim 1, characterized in that the drive wheel is a gear (10, 20, 43) and the gear member is arranged above the mixing rods (3, 30) coaxially to the axis of rotation (A) of the mixing beater (1, 31) and with the wall of the mixing device is a firmly connected cylinder or cone (16, 19, 35) with a central opening for the drive shaft (2, 32) of the mixing paddle (1, 31) and a toothing corresponding to the gear (10, 20, 43) ,

3. Mixing tool according to claim 1, characterized in that the inner surface of the wall (11.1) of the mixing device is used as the gear member, on which the drive wheel (21) lies non-positively and rolls with a rotational movement of the mixing whisk (1).

4. Mixing tool according to claim 1, characterized in that as a gear member above the mixing rods (3) coaxially to the axis of rotation (A) of the mixing paddle (1) and fixed to the wall of the mixing device cylinder or cone with a central opening for the drive shaft (2) of the mixing paddle (1) is used, on which the drive wheel is non-positively and rolls when the mixing paddle (1) rotates.

5. Mixing tool according to claim 1, characterized in that as a gear member above the mixing rods (3) arranged plate (23) with a plane transverse to the axis of rotation (A) of the mixing paddle (1) formed surface (24) on which the drive wheel (25) abuts in a frictional manner and rolls when the mixing whisk (1) rotates, the plate (23) being firmly connected to the wall of the mixing device and having an opening for the drive shaft (2) of the mixing whisk (1).

6. Mixing tool according to claim 4, characterized in that the plate (23) via rubber buffer (26) is arranged on a wall-fixed holder (17).

7. Mixing tool according to claim 4, characterized in that the drive wheel (25) is mounted on hard rubber.

8. Mixing tool according to one of the preceding claims, characterized in that the drive wheel (21, 25) consists of hard rubber or has a rolling surface made of hard rubber.

9. Mixing tool according to claim 1, characterized in that the stirring elements are at least two substantially parallel stirring bars (9) which are connected at one end to the drive rod (8) and at the other by a web (S).

10. Mixing tool according to claim 1, 2, 4 or 5, characterized in that the mixing rods (30) on a rotationally fixed to the drive shaft (32) of the mixing paddle (31) connected and arranged below the gear drive plate (33) are releasably attached, that the drive rod (40) for the additional whisk (41) is guided through the driver plate (33) and is mounted in the latter, and that its stirring elements (45) are releasably attached to the drive rod (40) below the driver plate (33).

11. Mixing tool according to claim 10, characterized in that the driver plate (33) is welded to the drive shaft (32).

12. Mixing tool according to claim 10, characterized in that the mixing rods (30) with the driver plate (33) and the stirring elements (45) with the drive rod (40) are each connected by screw connections.

13. Mixing tool according to claim 10, characterized in that the gear and the driving plate (33) are accommodated in a gear housing fixedly arranged on the mixing device and the driving plate (33) is rotatably supported on this.

14. Mixing tool according to claim 10, characterized in that the drive shaft (32) for the mixing paddle (31) is mounted on the gear housing (37).