DE202012101568U1 - Cleaning device for cleaning the inner wall of a mixing zone of a mixing device and mixing device for mixing flowable materials - Google Patents

Abstract

Cleaning device for cleaning the inner wall of a mixing zone, in particular a mixing tube, a mixing device, in particular a mixing pump for mixing flowable materials, in particular building materials, wherein the cleaning device has at least a first cleaning element, in particular a first scraping element for removing adhering to the inner wall material residues in that at least one first cleaning element for the purpose of cleaning an at least approximately cylindrical first portion of the mixing zone substantially in a circular orbit about a central axis of the first portion in the central axis at least approximately parallel orientation is movable such that it at least approximately one complete revolution A surface corresponding cylinder surface sweeps, characterized in that at least one second cleaning element (58, 58 '), in particular a second Schabele ment, for cleaning a deviating from a cylinder surface inner wall of a second portion (3a) of the mixing zone (4) is provided.

Description

The invention relates to a cleaning device for cleaning the inner wall of a mixing zone of a mixing device, in particular a mixing pump, according to the preamble of claim 1. Furthermore, the invention relates to a mixing device, in particular a mixing pump, for mixing flowable materials.

From the DE 20 2006 016 925 U1 a mixing device for mixing building material mixtures is known, which has a feed zone for supplying dry material, a mixing zone comprising a mixing tube and a hopper for mixing the dry material with introduced into the mixing tube water and a pump unit and an adjoining feed line for transporting away the building material mixture. In order to avoid curing of the building material mixture within the mixing tube and thus a gradual clogging of this mixing tube after completion or longer-term interruption of the operation of the mixing device, especially at the end of the working day, this must be cleaned as long as the building material mixture is still in the flowable state. A pure rinsing of the mixing tube with cleaning liquid, for example by only water is supplied, is not sufficient to completely wash off the adhering to the inner wall of the mixing tube building material mixture. In addition, such flushing would cause unnecessarily high water consumption. Therefore, a mixing tube cleaning shaft is provided for cleaning the mixing tube inner wall, which is inserted for the cleaning process instead of a mixing shaft in the mixing tube and connected to the drive motor of the mixing shaft and abschabt the residues on the mixing tube wall during rotation.

It is an object of the invention to provide a cleaning device for cleaning the inner wall of a mixing zone of a mixing device and a mixing device for mixing flowable materials, in which a further cleaning of the mixing zone of this mixing device is made possible.

The solution of this object is achieved in a cleaning device for cleaning the inner wall of a mixing zone of a mixing device for mixing flowable materials, wherein the cleaning device comprises at least a first, in particular elongated, cleaning element for removing adhering to the inner wall material residues, which at least one first cleaning element for the purpose the cleaning of an at least approximately cylindrical first portion of the mixing zone substantially in a circular orbit about a central axis of the first portion in the central axis at least approximately parallel orientation is movable such that it covers a complete at least approximately a cylinder surface corresponding surface, according to the invention thereby in that at least one second cleaning element is used to clean an inner wall, deviating from a cylinder jacket surface, of a second partial region s the mixing zone is provided. In this way, not only the inner wall of the first portion, but also the inner wall of the second portion, be released from adhering material. Thus, the cleanable area is expanded in area and in the best case, all vulnerable by clogging with hardened material surfaces can be cleaned without further action.

The at least approximately cylindrical first partial region can be a mixing tube of the mixing device, which is in particular a mixing pump. Such a mixing device is used for example in construction for mixing building materials. In order to prevent hardening of the mixed material on the inner wall of the mixing zone after use or in a prolonged interruption of use of the mixing device, without disproportionately consuming cleaning fluid, in particular water, the adhering material is preferably mechanically removed from the inner wall, wherein At least one of the first and second cleaning elements may be a scraping element.

During its rotation about the central axis of the first subregion, the second cleaning element preferably sweeps over a surface which corresponds to the lateral surface of a cone or truncated cone, in particular with an overhead base surface, this conical or truncated cone surface expediently being the surface of a cone-shaped or funnel-shaped input region of the cone Mixing zone corresponds. In this case, the cleaning device, not only a mixing tube, but also a hopper of the mixing zone, which is upstream of the mixing tube, free of adhering material. Even in such an input area can namely be mixed material, even if admixed liquid is supplied only in the downstream mixing tube.

A particular embodiment of the invention provides that at least the first, possibly also the second cleaning element coupled to a rotationally symmetrical body, in particular welded, is or are. This rotationally symmetrical basic body can essentially be a hollow cylinder.

In order to enable the cleaning device in a rotational movement, a drive shaft is preferably provided which is guided through a through opening of the base body, in particular by a front-side cover surface of the same. For the drive, a drive motor may be provided, which may be located in or on the mixing device.

For a particularly effective torque transmission from the drive shaft to the base body, the cross-sectional area of the drive shaft and, at the same time, the area of the associated opening on the base body also deviate from the circular shape. In particular, these surfaces correspond to a rectangular shape. In this case, the drive shaft need not be rigidly coupled to the main body of the cleaning device, but instead may be slidably guided within the aperture opening. Such sliding displacement of the cleaning device allows a gradual cleaning, so z. B. a successive scraping of the adhering to the inner wall material, for example, starting at one end of the cylindrical first portion, in particular at the end of the second portion, ie z. B. at the entrance of the mixing zone, adjacent.

In order to ensure the displacement of the cleaning device along the drive shaft, means for exerting the axial feed movement during the cleaning process are preferably provided. These means may be motor or similar propulsion means. Preferably, however, the gravity is utilized for the feed, which acts on the cleaning device due to their mass. In this case, a feed direction is provided, which is designed at least approximately vertically, which means that the central axis of the first portion of the mixing zone is at least approximately aligned vertically.

In a particularly preferred manner, the cleaning device performs at least approximately a helical or screw-like movement during the cleaning process, wherein first the adhering material of the mixing tube is removed from top to bottom. If the first cleaning element has penetrated into the mixing tube so far that its lower end has approximately reached the lower end of the mixing tube, then the second cleaning element arranged obliquely outwards at the cleaning device begins to clean the conical inlet region of the mixing zone. As soon as the second cleaning element has completely removed the material adhering in the conical entrance area, the cleaning process is completed.

Both first and second cleaning elements may be separate parts and each may be coupled to the body by itself. A particularly suitable embodiment provides, however, that the second cleaning element, which is preferably elongated, with one end, for example its lower end, at one end of the first cleaning element, preferably the upper end, coupled, in particular by means of a rigid coupling. At the coupling point it can be provided that the longitudinal axes of the first and the second cleaning element enclose an obtuse angle. The coupling can be achieved by a connection means or a connection method, e.g. As welding, be made. However, in order to make the manufacturing process of the cleaning device particularly simple and inexpensive, first and second cleaning element are made of an angled, one-piece flat or square iron.

Another particularly suitable embodiment has a second cleaning element, which is designed trapezoidal. This trapezoidal shape comprises an oblique side, which is intended for, in particular scraping, cleaning of the inner wall. With a side adjacent to this oblique side, the second cleaning element is coupled to the first cleaning element. The second cleaning element can form a rectangular trapezoidal shape, wherein the only oblique side forms the cleaning edge in this case.

In principle, it is quite conceivable that first and second cleaning element form any geometric shape, they must have only one, preferably rectilinear, side or edge, which together form an obtuse angle, the angle between the inner walls of the conical entrance and cylindrical Area of the mixing zone corresponds.

The solution of the aforementioned object is further achieved by a cleaning device for cleaning the inner wall of a mixing zone, in particular a mixing tube, a mixing device, in particular a mixing pump for mixing flowable materials, in particular building materials, wherein the cleaning device at least a first cleaning element, in particular a first scraping element for removing material residues adhering to the inner wall, which at least one first cleaning element for the purpose of cleaning an at least approximately cylindrical first portion of the mixing zone is substantially movable in a circular orbit about a central axis of the first portion in at least approximately parallel orientation to the central axis . According to the invention, the at least one first cleaning element, in particular the at least one first and the at least one second cleaning element, is elongated and at least one end has a bevelled surface, a so-called Free surface, comprises, whose normal vector has a component which points at a movement of the cleaning element on the circular orbit in the direction opposite to the direction of movement. The area pointing in the direction of rotation scrapes the material residues, in particular the building material mix residues, from the inner wall, and the bevelled open area intensifies the scraping effect. When providing an open space, pay attention to how the direction of movement should be set later.

The solution of the above object is finally achieved according to the invention by a mixing device, in particular a mixing pump for mixing flowable materials, in particular building materials, with a mixing zone, which in particular comprises a mixing tube, and with a receiving and / or coupling device for receiving and / or coupling a cleaning device, which at least partially comprises the aforementioned features.

The mixing device preferably comprises a drive motor for driving a mixing helix or a mixing rod, to which the cleaning device, in particular after a previous removal of the mixing helix or the mixing rod, can be coupled.

For an essentially successive cleaning process, it is advantageous if the cleaning device is axially movable within an at least approximately cylindrical first portion of the mixing zone. If, at least during the cleaning process, the central axis of the cylindrical, first sub-region of the mixing zone is aligned at least approximately vertically, then a gravitational drive along the central axis can act on the cleaning device.

The invention will be explained below with reference to exemplary embodiments. Reference is also made to the drawings, in whose

1 an overall view of the mixing device, which is partly broken open for the visualization of the inner parts,

2 a first embodiment of a cleaning device for the mixing zone of the mixing device according to 1 in a perspective side view,

3 the cleaning device according to 2 in a perspective view obliquely from above,

4 a second embodiment of a cleaning device in perspective,

5 a plan view of the cleaning device according to 4 .

6 a sectional view of the cleaning device according to 5 along the section line VI-VI,

7 - 10 a chronological sequence at the beginning and during the cleaning process
are each shown schematically. Corresponding parts and sizes are in the 1 to 10 provided with the same reference numerals.

In the 1 The illustrated apparatus for mixing flowable materials or mixtures is preferably provided for mixing building material mixtures and comprises, in an arrangement obliquely one above the other viewed from top to bottom, a feed zone 2 , a mixed zone 4 and a pump unit 7 as well as a subsequent support line 8th for transporting the building material mixture. Typical building material mixtures are plasters, mortars, fillers, leveling compounds, primers and adhesion promoters, building material adhesives and building material inks. The feed zone 2 is according to 1 funnel-shaped with a rectangular upper base and has a corresponding funnel-shaped Zuführzonenwandung 3 on, extending down over a conical or frusto-conical transition area 3a in a subsequent mixing zone tube 6 that the mixing zone 4 encloses, continues. Zuführzonenwandung 3 , Mixing zone funnel 3a and mixing zone tube 6 preferably consist of a correspondingly thick steel sheet.

In the feeding zone 2 is from the top by a on a paragraph of Zuführzonenwandung 3 Overlying grille 17 Filled dry material. On the grille 17 is a drive motor 9 fixed, which rotatably drives a rotary assembly about a common axis of rotation A. The rotating assembly includes one with the drive motor 9 coupled rotary shaft 10 and a subsequent mixing device 12 with two eccentric and parallel to the axis of rotation A running mixing blades 12A and 12B and one around the mixing device 12 in the lower region or conical transition region of the feed zone 2 to the mixing zone 4 towards extending helix 11 on. At the bottom of the mixer 12 is a screw rotor 13 of the pump unit 7 rotatably coupled, for example via a slot-web connection. Thus, via the one drive motor 9 both the mixing spiral 11 as well as the mixing device 12 as well as the worm rotor 13 the pump unit 7 driven together. However, it can also be provided separate drives.

The mixing zone tube 6 encloses the mixing zone 4 outwardly completely with its substantially cylindrical tube wall and has only on one side two molded connecting pieces 18 and 19 for feeding liquid feedstock, typically water, into the mixing zone 4 on. The connecting pieces 18 and 19 are on the mixing zone tube 6 led to the outside. In 1 is only on the lower connection piece 19 a feed line (feed tube) 15 for supplying liquid starting material, for example water, connected. The provision of two axially offset to the axis of rotation A connecting piece 18 and 19 allows selective delivery of the second feedstock, typically water, to that from the feed zone 2 coming first starting material, usually a dry material or powder material to optimize the mixing process.

The mixing of the building material mixture largely takes place in the area of the mixing zone pipe 6 instead, because there, the liquid is supplied. Because of the highly hygroscopic property of the dry material, however, parts of the mixture are also in the region of the mixing zone filling funnel 3a that together with the mixing zone tube 6 the mixing zone 4 encloses. Since these areas thus contain the use of the mixing device, the building material mixture, which is also on the inner walls of the Mischzoneneinfülltrichters 3a and the mixing zone tube 6 Once the mixing device has been shut down, these areas must be cleaned so that the building material mixture does not harden on the inner walls and in this way the mixing zone 4 can gradually add up.

The device according to 1 further comprises a housing 16 to which the components already described are attached and which is provided with wheels for mobile transport of the entire device.

For cleaning the mixing zone 4 is an in 2 and 3 illustrated mixing zone cleaner 50 provided according to a first embodiment. This has a hollow cylindrical body 51 and an end face of the main body 51 closing cover plate 52 on. In the area of at 53 indicated central axis of the body 51 is in the cover plate 52 a rectangular through hole 54 arranged. In this through hole 54 is a drive or cleaner shaft 59 (see. 7 - 10 ), with which the mixing zone cleaner 50 is displaceable in a rotational movement, inserted in a freely displaceable manner. The cleaner shaft 59 has a through hole 54 opposite cross section and is preferably a flat bar. So the main body 51 of the mixing zone cleaner 50 one to its central axis 53 can perform concentric rotary motion, this central axis goes 53 by the center of gravity of the surface of the through hole 54 ,

The mixing zone cleaner 50 also has three each at the same angle to each other on the body 51 by means of welds 56 attached scraping rods 55 on. These scraping rods 55 are made of a cut to length four-cornered iron and protrude with its lower end over the lower end of the body 51 out. The lower end of the scraping rods 55 is at the body 51 opposite side as at 57 indicated beveled, so that the mixing zone cleaner 50 with these scraping rod ends into the mixing zone pipe 6 easier to insert and avoid tilting. A scraping rod 55 also protrudes at its upper end 58 over the main body 51 out and is in the area of the cover plate 52 angled outwards. The scraping rods 55 are dimensioned in their cross-sectional area so that their outer edges to the central axis 53 , which also corresponds to the axis of rotation, have a distance equal to the radius of the mixing zone tube 6 equivalent.

4 - 6 show a second embodiment of a mixing zone cleaner 50 , This embodiment differs substantially from the first variant in the shape of the scraping element for the mixing zone hopper 3a and is as a scraping plate 58' shown. This scraper plate 58' has substantially the shape of a rectangular trapezium in the two-dimensional view and is with the shorter of its two parallel sides to the upper end of the scraper bar 55 coupled, wherein in the present case this coupling consists in that Schabstab 55 and scraper plate 58' are shown in one piece in a cost effective manner. Another western difference to the first embodiment is that the body to the top of the scraping plate 58' is extended. In this way, an overall more stable training, since the Schabplatte 58' through the coupling to the main body 51 is stiffened. Also in this second embodiment are the scraping rods 55 to the body 51 welded, with the sake of simplicity in the 4 and 5 only the welds 56 on the cover plate 52 are indicated.

Finally, in the second embodiment, the lower ends of the two scraper bars 55 without upper scraper plate 58' yet another embodiment. Instead of a bevel 57 on the body 51 opposite side, these are with a wedge-shaped slope 60 equipped in the direction of rotation. The thus formed tip shape of these Schabstabenden improved because of the adjusting himself more intense scraping the cleaning effect for the inner wall of the mixing zone tube 6 and increases the feed effect.

Based on 7 - 10 the sequence of the cleaning process with four different arrangements of the mixing tube cleaner 50 shown. From the entire mixing device according to 1 is in each case only the mixing tube assembly with drive motor 9 shown. This arrangement is actually also for cleaning the frame or housing 16 removable. In the 7 - 10 is the operation of the aforementioned second embodiment of the mixing tube cleaner 50 indicated, however, the first embodiment operates in the same way.

To the mixing tube cleaner 50 together with the cleaner shaft 59 instead of the mixing spiral 11 To be able to use must, in the first operation of the on the axis 70 pivotally mounted on the mixing tube assembly 4 mounted drive motor 9 swung away and thus the access to the mixing zone from above are released. In 7 is the drive motor 9 already in the weggeschwenkten situation.

After removing the mixing coil 11 First, the cleaner shaft 59 , as in 7 already done, used and at the bottom of the connection to the screw rotor 13 coupled, what about a bridge-slot connection 71 he follows. The mixing zone cleaner 50 is according to 7 not yet used. The insertion process is in 8th indicated. The drive motor is still swung away and thus gives access to the mixing zone 4 free.

After inserting the mixing tube cleaner 50 the drive motor is swung back into its operating position and thereby comes the cleaner shaft 59 in engagement with the connection flange 72 on the drive motor 9 , This also includes a web-slot connection to the cleaner shaft for suitable torque transmission 59 , After inserting the mixing tube cleaner 50 becomes the drive motor 9 started. Will the mixing zone cleaner 50 set in a rotational motion, it begins with the lower, bevelled ends of the scraping rods 55 on the inner wall of the mixing zone tube 6 scrape off adhering building material mixture. As the mixing zone cleaner 50 loose on the cleaner shaft 59 guided, he slips over his through hole 54 slow due to its own weight from top to bottom through the mixing zone tube 6 and thus cleans by means of the scraping rods 55 in a screwing the inner wall of the mixing zone tube 6 ,

In 9 If cleaning is already in progress, the mixing tube cleaner 50 Already has about halfway into the mixing zone tube 6 worked into it while the upper half of the mixing tube 6 cleaned. The cleaning process is continued with rotating mixing tube cleaner 50 continued until according to 10 the mixing tube cleaner has penetrated so far that the scraping plate 58' to the dirty mixing zone hopper 3a arrives. The obliquely outwardly pointing scraping edge of the scraping plate 58' the one scraper bar 55 is now intended, including the inner wall of the conical Mischzoneneinfülltrichters 3a to clean. The oblique orientation of the scraping edge corresponds to the opening angle of the mixing zone hopper 3a , The length of the scraping edge of the scraping plate 58' is chosen so that at least a lower portion of the Mischzoneneinfülltrichters 3a on which the building material mixture applies, can be scraped off.

The position of the mixing zone pipe cleaner 50 in 10 corresponds to the already completed cleaning. The mixing zone cleaner 50 is up to the inner wall of both the mixing zone tube 6 as well as the mixing zone hopper 3a penetrated and thereby removed all building material residues.

The length of the mixing zone cleaner 50 to the angled end area 58 in the first embodiment corresponds to the length of the cylindrical mixing zone tube 6 , so that the angled end area 58 the scraping rod 55 the conical mixing zone hopper 3a even at the end of the movement can actually clean. In the second embodiment, the scraping bars are 55 chosen so that their lower ends at the bottom of the mixing zone tube 6 arrived when the scraping edge of the scraping plate 58' to the inner wall of the mixing zone hopper 3a has worked ahead.

The removed building material residues fall down to the pump unit 7 with the screw rotor 13 and are transported by it to the outside.

Even if the two aforementioned exemplary embodiments of the mixing zone cleaner 50 only one on each of the scraping rods a top coupled angled end portion 58 or provide a trapezoidal Schabplatte 58 ', which is a particularly good storage of the mixing zone cleaner 50 favors, it is also conceivable, two or three or even more such scraping 58 respectively. 58' for the mixing zone hopper 3a to arrange.

The mass of the mixing zone cleaner 50 and thus the weight force acting on it must be designed such that a sufficient Movement force can be achieved down. A corresponding adjustment of the required mass can be achieved in particular by suitable selection of the wall thickness of the cylindrical base body 51 or by suitable dimensioning of the scraping rods 55 to reach. In this respect, because of the slightly longer design of the body 51 according to the second embodiment, its wall thickness be dimensioned somewhat smaller than the main body 51 the first embodiment.

LIST OF REFERENCE NUMBERS

2

 feed zone

3

 Zuführzonenwandung

3a

 Mischzoneneinfülltrichter

4

 mixing zone

6

 Mixing zone tube

7

 pump unit

8th

 delivery line

9

 drive motor

10

 rotary shaft

11

 mixing shaft

12

 mixing device

13

 screw rotor

15

 feed

16

 casing

17

 grille

18, 19

 spigot

50

Mixing zone cleaner

51

 body

52

 cover plate

53

central axis

54

 Through Hole

55

 Schabstäbe

56

 welds

57

 beveled scraper ends

58

 angled end region

59

 Cleaning shaft

60

 wedge-shaped slope

70

 axis

71

 Web-slot connection

72

 flange

A

 axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202006016925 U1 [0002]

Claims (17)

Cleaning device for cleaning the inner wall of a mixing zone, in particular a mixing tube, a mixing device, in particular a mixing pump for mixing flowable materials, in particular building materials, wherein the cleaning device has at least a first cleaning element, in particular a first scraping element for removing adhering to the inner wall material residues in that at least one first cleaning element for the purpose of cleaning an at least approximately cylindrical first portion of the mixing zone substantially in a circular orbit about a central axis of the first portion in the central axis at least approximately parallel orientation is movable such that it at least approximately one complete revolution a surface corresponding cylinder surface sweeps, characterized in that at least one second cleaning element ( 58 . 58' ), in particular a second scraping element, for cleaning an inner wall, deviating from a cylinder jacket surface, of a second partial region ( 3a ) of the mixing zone ( 4 ) is provided. Cleaning device according to claim 1, characterized in that the second cleaning element ( 58 . 58' ) as it revolves around the central axis ( 53 ) of the first subarea ( 6 ) sweeps over a cone or truncated cone surface. Cleaning device according to claim 2, characterized in that the second cleaning element ( 58 . 58' ) for cleaning a funnel-shaped entrance area ( 3a ) of the mixing zone ( 4 ) is provided. Cleaning device according to one of claims 1 to 3, characterized in that the first ( 55 ) and the second ( 58 ) Cleaning element on a rotationally symmetrical, in particular substantially hollow cylindrical, basic body ( 51 ) coupled, in particular welded, are. Cleaning device according to claim 4, characterized in that the basic body ( 51 ) an end face ( 52 ) with passage opening ( 54 ) for receiving a drive shaft ( 59 ) having. Cleaning device according to claim 5, characterized in that the drive shaft ( 59 ) has a different cross-sectional area from a circular shape, in particular a rectangular area, and within the passage opening ( 54 ) is freely movable. Cleaning device according to one of claims 1 to 6, characterized by means for exerting an axial feed movement during the cleaning process along the central axis ( 53 ) of the first subarea ( 6 ). Cleaning device according to one of claims 1 to 7, characterized in that the second cleaning element ( 58 . 58' ) with one end or in a corner region at one end of the first cleaning element ( 55 ) is coupled. Cleaning device according to claim 8, characterized in that the second cleaning element ( 58 ) is elongated Cleaning device according to claim 9, characterized in that the longitudinal axes of the first ( 55 ) and the second ( 58 ) Include cleaning element at an obtuse angle. Cleaning device according to one of claims 8 to 10, characterized in that the first ( 55 ) and the second ( 58 ) Cleaning element are made of an angled, one-piece flat or square iron. Cleaning device according to claim 8, characterized in that the second cleaning element ( 58' ) has a, in particular rectangular, trapezoidal shape. Cleaning device according to the preamble of claim 1, in particular according to one of claims 1 to 12, characterized in that the at least one first cleaning element ( 55 ), in particular the at least one first ( 55 ) and the at least one second ( 58 ) Cleaning element, is elongated and at least one end of a beveled surface ( 60 ) whose normal vector has a component which points to a movement of the cleaning element on the circular orbit in the direction opposite to the direction of movement. Mixing device, in particular mixing pump, for mixing flowable materials, in particular building materials, with a mixing zone, in particular a mixing tube, and with a receiving and / or coupling device for receiving and / or coupling a cleaning device according to one of claims 1 to 13. Mixing device according to claim 14, characterized in that a drive motor ( 9 ) for driving a mixing helix ( 11 ), to which a drive shaft of the cleaning device ( 50 ) can be coupled. Mixing device according to claim 14 or 15, characterized in that the cleaning device ( 50 ) within an at least approximately cylindrical first subregion ( 6 ) of the mixing zone ( 4 ) is axially movable. Mixing device according to claim 16, characterized in that at least during the cleaning process, the central axis ( 53 ) of the first subarea ( 6 ) of the mixing zone ( 4 ) is aligned at least approximately vertically and one along the central axis ( 53 ) Gravity-induced feed movement of the cleaning device ( 50 ) is possible.

Images