JPH028013A - Continuous mixer - Google Patents

Abstract

PURPOSE: To prevent the accumulation in a mixing pipe, to achieve sufficient mixing and to enable the operation reduced in abrasion of an eccentric worm pump by forming a container for a mixing material into a funnel shape to directly arrange the same on the almost horizontal mixing pipe. CONSTITUTION: A supply worm and a stirrer 14 are arranged in a mixing pipe 1 for continuously mixing water and a building material and an excentric worm pump 10 is almost coaxially connected to the stirrer 14 and the shaft of the stirrer 14 is used as the drive shaft for the eccentric worm pump 10 and the supply worm 5 comprising rubber is connected to the stirrer in coaxial relation to the eccentric worm pump 10 within the mixing pipe 1. The motor 11 common to the stirrer 14, the supply worm 5 and the eccentric worm pump 10 is provided and the shaft of the supply worm 5 is used as the drive shaft for the shaft of the stirrer 14 and the axial line of the mixing pipe 1 is inclined at an angle of 10-15 deg. and a funnel-shaped container housing a building material is arranged to the supply worm 5 through the mixing pipe 1 under gravity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous mixing device for water and construction materials.

Such equipment is used for automatically mixing dry materials primarily used as bags, such as finishing plaster, finishing mortar, stucco, cement, etc.
It can also be used to automatically mix dry materials that are likewise fed into a silo and must be mixed with water as well as other additives.

A device of this type is known from German Patent No. 2 407 657, which, in addition to a mixing tube with an eccentric worm pump connected thereto, also has a second feed device by which the water to be mixed is mixed. Free material is fed into the mixing tube. This has the disadvantage, first of all, that the construction is complex and the manufacturing costs are high, since a total of two motors are used together with an associated electrical control device. In this known device, the container for the dry material is located laterally alongside the mixing tube, so that the dry material has to be fed into it. The mixing tube must necessarily be arranged vertically for this reason.

As a result, the dry material can descend into the mixing tube under the influence of gravity. However, this means that for the generation of satisfactory mixing the mixer can only be operated at very high speeds, with the result that there is a risk of injection of mixed water into the area of the mixing tube where wet material is present. occurs. Particularly in rapidly hardening construction materials, deposits occur which impair continuous operation and, at the very least, lead to time-consuming cleaning operations. Due to the high speed of the mixing or stirrer, which can be, for example, 400 revolutions per minute, the eccentric worm pump is also driven at this speed, so on the one hand its service life is reduced and on the other hand the mortar is continuously Moreover, the continuous suction of the hard and plastic mortar, which is especially exhibited by the pumping, is greatly hindered. A further disadvantage of the known device is that in the event of a blockage or bending of the mortar hose or due to a backflow of water and a subsequent high slope, a small supply to the eccentric worm pump occurs, in this way the water reaches the upper region of the mixing tube. Then a container for further dry material is reached. This requires immediate complete draining, cleaning and drying leading to time-consuming work interruptions. A further disadvantage is that in this known device, the vertical mixing tube is connected to the respective motor for driving the eccentric worm pump via a fixed mixing helix. Since the worm of an eccentric worm pump rotates not concentrically but highly eccentrically, an eccentric movement is forced on the mixing helix so that the diameter of the mixing helix must be adjusted to be substantially smaller than the internal diameter of the mixing tube. This results in an accumulation of unobstructed hardening material at the outer edge of the mixing tube, which must be removed at great expense after each operation.

A similar device is known from French Patent No. 1,572,335, in which the materials to be mixed are first fed upwards by means of a feed worm from the lower end of a funnel-shaped container and then successively in a downward direction. Pass through the dosing worm mixer and eccentric worm pump. The axes of the supply worm, the dosing worm and the mixer run parallel to each other, the motor being used to drive both axes by means of an intermediate transmission connection. The disadvantage here is that additional gearing is required as well as that the material supply is relatively complex in terms of space.

Finally, from DE 24 20 023 A1 a continuous mixing pump is known, in which the materials to be mixed are delivered vertically from a cylindrical container by means of a stirring device, and
Subsequently, a mixing tube is reached, which is arranged at an angle with respect to the horizontal plane. Inside the mixing tube there is a feed worm, a mixer and an eccentric worm pump in a generally coaxial arrangement. However, also in this known device, two separate drives consist, more precisely, on the one hand for the above-mentioned stirring device inside the container and on the other hand of the feed worm, the mixer and the eccentric worm pump. The disadvantage is that it is necessary for the device.

It is an object of the invention that, by avoiding the disadvantages belonging to the relevant prior art, satisfactory mixing is achieved, in particular without the formation of deposits in the area of the mixing tubes, and reliable and wear-free operation of eccentric worm pumps is possible. The object of the present invention is to provide a device of the above-mentioned type, which can be used for a variety of purposes. This object is achieved in a device of this type by the features of patent claim 1.

The container for the dry material to be mixed is designed in the form of a funnel and is placed directly on the almost horizontal mixing tube, so that all the materials can be accommodated in the mixing tube under the action of gravity. The mixing tube thereby has dimensions that correspond to the dimensions of the funnel-shaped vessel and for this reason can be dimensioned correspondingly larger, resulting in a mixing chamber that is correspondingly larger in diameter and also longer. I can do it.

This mixing chamber is actually used at low rotational speeds, e.g.
It can be operated at rev/min to 200 rev/min. As a result, homogeneous mixing and also continuous pumping are finally achieved due to the low rotational speed. Furthermore, this results in a correspondingly increased service life of the eccentric worm pump.

Also, lightweight insulating mortars can be mixed satisfactorily. The flexible bearing of the stirrer is primarily used, although not forced into it, by the dynamically adapted drive of the eccentric worm pump, since its eccentric elliptical movement is not hindered by the flexible connection with the stirrer. The two unhindered movements of the eccentric worm pump not only ensure a satisfactory pumping efficiency, but also only a small amount of wear occurs.

The relatively large mixing tube capacity therefore has the additional advantage that, in connection with the above-mentioned increased rotational speed of the mixer, the mixing time itself is increased.

The device according to the invention also allows such materials which require relatively long mixing times to be mixed satisfactorily.

Therefore, mixing pumps of the type mentioned above to be incorporated into the prior art are known, whose water and mixing chamber volumes are approximately 1 ρ, whereas at a conveying rate of 20 Ω/min only 1/
This results in a 20 minute mixing time. In contrast, in the device according to the invention, the corresponding capacity can be, for example, 5Q, resulting in a correspondingly increased mixing time of 5/20 minutes.

Preferably, the mixing tube is covered at least in the mixing zone with a thick wall of smooth synthetic resin that is very resistant to abrasion. The complete coating of the mixing tube with a highly abrasion-resistant synthetic resin prevents the adhesion and hardening of construction materials and the associated time-consuming cleaning operations. According to a further feature, the formation of deposits in the edge area of the mixing tube is prevented, strictly speaking, before hardening occurs, since these can be removed by a scraping rod. The scraping rod mentioned above preferably extends over a substantial part of the length of the mixing tube. At the same time, this scraping rod also contributes to the action of displacing material in the peripheral area of the mixing tube for mixing.

The feed helix, which is arranged on the edge of the mixing tube facing the eccentric worm pump, contributes to a uniform throughput of the eccentric worm pump with the mixed material and thus to a uniform material feed. A reliable restraint of the material in the direction of the eccentric worm pump is therefore achieved at the outlet of the mixing tube by the above-mentioned feed helix.

A segmented implementation of the feed helix according to claim 5 is particularly advantageous in practice in connection with the conveyance of uniform material.

In addition to avoiding build-up in the peripheral area, the features of claim 6 also serve to feed the mixed material in the direction of the inlet of the eccentric worm pump.

The features of claims 7 and 8 result in a stirrer characterized by an externally arranged scraping bar and an inwardly directed stirring arm. The stirring arm as well as the scraping rod also contribute to the mixing action, the scraping rod being able to be joined in particular at the front.

The features of claims 9 to 10 are of practical use in connection with the mixing action which brings about a good homogeneity of the volume of the mixing tube, in which also the bridge plays a role. In addition to contributing to the mixing action, this bridge also serves as a support for functional elements that serve, inter alia, for the flexible connection of the agitator to the eccentric worm pump and the feed worm.

Due to the features of claim 11, during the mixing process the formation of hollow spaces or air inclusions is encouraged within the mixed material, so that the material mixed in this way is used for the insulation of plasters, for example. Reliable porosity is achieved. The exact dimensions of the rectangular cross-sectional profile of the stirrer arm can be selected according to practical considerations, and it depends essentially solely on the reflux relationship of the cross-sectional profile during stirring, which facilitates the formation of the hollow space mentioned above.

The features of claims 12 and 13 facilitate rapid and particularly homogeneous mixing with water or other, especially liquid, additives. In special cases, an entire mixing tube with a uniform distribution of such nozzles is then provided. Its installation in the lower area of the mixing pipe is particularly effective in practice.

The design of the overall joint according to the features of patent claim 15 is technically simple to manufacture, particularly cost-effective and effective in practice. In the play to be achieved here, on the one hand, sufficient mobility is provided which depends on the design data of the eccentric worm pump, and on the other hand, this mobility is limited so as not to result in contact of the stirrer with the inner wall of the mixing tube. Ru.

In the following, the invention will be explained in more detail with reference to embodiments shown in the accompanying drawings.

The mixing tube is designated by the reference numeral 1, and the mixing tube 1 is
It is inclined somewhat downwardly at an angle of 0° to 15°, on which is mounted a funnel-shaped container 2 for containing construction material.

A slider 3 separates the mixing tube 1 from the container 2.

In the area of the inlet 4 of the mixing tube 1, a rubber worm 5 is arranged adjacent to the inlet opening 4, with which the construction material is fed into the actual mixing chamber 6. Mixing chamber 6
is coated over its entire length, including the length of the pump inlet funnel 7, with a smooth synthetic resin wall thickness that is highly resistant to abrasion. The mixing chamber 6 is equipped with at least one mixing water nozzle 8 and, in addition, in the area of the pump inlet funnel 7 at least one cleaning nozzle (not shown) can be provided. In reality, a large number of mixing water nozzles 8 can be installed along the axial direction of the mixing tube 1. An eccentric worm pump 10 is fixed to the flange 9 attached to the end of the mixing tube 1 by a method not shown. The mixing water nozzle 8 is arranged at the end of the mixing tube 1 towards the eccentric worm pump 10, preferably in its lower region.

The eccentric worm pump 10 is driven by a motor 11 via a number of shafts separated by joint connections. A first joint 12 is provided between the motor 11 and one end of the rubber worm 5. Other joints 13 , 15 are provided between the other end of the rubber worm 5 and one end of the stirrer 14 and between the other end of the stirrer 14 and the eccentric worm pump 10 . All joints 12, 13, 15 are very advantageously formed in the simplest case by internal and external tetrahedral-shaped component connections with corresponding play.

The rubber worm 5 terminates at the end facing the motor 11 with a closing disc (not shown), which prevents the backflow of wet material. The rubber worm 5 extends over the length of at least two worm spacings within the mixing tube I in order to avoid accidental back-splashing of water into the dry area.

Due to the joint connection between the eccentric worm pump 10 and the stirrer 14, the eccentric movement of the eccentric worm pump is not hindered during operation of the device.

For example, the eccentric worm pump 10 rotates 160 rotations -20
It is operated with relatively low rotational speeds in the range of 0 revolutions per minute, so that the mixing chamber 6 can be adjusted substantially more in diameter than previously known for the same transport volume.

It can also have approximately twice the length.

The dry material contained in the funnel-shaped container 2 of the device reaches the mixing tube 1 through the inlet opening 4 only under the influence of gravity and is fed into the mixing chamber 6 by the rubber worm 5. 1
The mixing water nozzle or nozzles 8 cooperate with an automatic actuator (not shown) for the administration of the water to be mixed, so that a limited mixing of the injected water takes place in the mixing chamber 6. Then, the material mixed with water is further pumped by an eccentric worm pump 10.

However, the subject matter of the invention also allows for the bombing and optionally unavoidable post-mixing of already mixed moist mortar, so that the mixing water nozzle 8 can be utilized for additives.

The agitator 14, shown only schematically in FIG. 1, will be described in more detail below in connection with FIGS. 2-4.

The agitator 14 has a longitudinal axis indicated by the reference numeral 16 in FIGS. 2 and 4 and consists essentially of two scraping rods 17, which are spaced opposite each other at equal intervals. It extends parallel to the longitudinal axis 16. A bridge 18 extending radially with respect to the longitudinal axis FA16 connects one end of the two scraping rods 17 to each other;
The respective other ends of the scraping rods 17 are likewise attached via radially extending bridge members 19 to a bearing body 20 through which the longitudinal axis 16 extends. The bearing body 20 in the illustrated embodiment has a longitudinal axis #I.
, 116.

Bridge 1 for flexible coupling of agitator 14 to rubber worm 5 on the one hand and to eccentric worm pump 10 on the other hand.
A square shaft 21 is fixed on the outside of the shaft 8, and a bearing body 2 is mounted on the other side.
The square shaft 21 and the square hollow opening 22 in which the square hollow opening 22 is provided embody the functional parts of the joint 13.15.

Joints made substantially the same on the top and bottom 12° 13.15
are each formed by a component connection consisting of a square shaft 21 and a square hollow opening 22, which is adjusted by a constant play that ensures a sufficiently free movement in the area of the joint.

In the illustrated embodiment, the scraping rods 17 are substantially square in cross section, and are arranged to swing about their respective axes in the same direction as the rotational direction of the stirrer 14. However, in principle it is also possible here to use a scraping rod 17 which is rectangular in cross-section.

Two substantially radially inwardly extending stirring arms of a rectangular shape in cross-section are indicated by 23 on the side opposite the longitudinal axis 16 of the scraping bar 17;
These stirring arms 23 terminate at regular intervals in front of the longitudinal axis M16. The stirring arms 23 have approximately the same spacing from the bridge 18 on the one hand and from the bridge member 19 on the other hand. The stirring arm 23 is fixed to the scraper 17, preferably by welding.

Reference numeral 24 designates a feed helix, which is fastened to the end of the stirrer 14 facing the eccentric worm pump 10 , more precisely to the bearing body 20 . The supply helix 24 consists of two spiral members 25, 26 arranged opposite each other with a distance between them.
26 ensures the supply of uniform material in the direction of the eccentric worm pump 10.

The scraping bar 17 is used to scrape off or prevent material build-up in the peripheral area of the mixing chamber 6. If necessary, two or more scraping rods 17 can be provided. Further, the portion of the scraping rod 17 that protrudes from the bridge member 19 in the axial direction contributes to uniform material supply toward the eccentric worm pump 10.

In particular, the flexible connections on both sides of the stirrer 14 do not impede the movement of the eccentric worm pump 10, so that the connection formed by the illustrated square hollow openings allows the necessary movement of the stirrer 14. We must have a play that corresponds to that.

However, this play is limited by the condition that the stirrer 14 must not come into contact with the inner wall of the mixing chamber 6 of the synthetic resin coating.

The joint formed by the square hollow opening in the above-mentioned embodiments can in principle also be replaced by other polyhedral hollow openings or other joint structures, with which the angular mobility can be improved. Comparable dynamic edge conditions can be achieved.

Since in the device according to the invention the eccentric worm pump rotates relatively slowly, a correspondingly high rotational torque must be transmitted via the stirrer 14. Furthermore, the axial forces generated by the eccentric worm pump during operation are transmitted by the stirrer 14 in a direction opposite to the feed direction, so that the stirrer also has to be dimensioned according to synthetic considerations.

Reference numeral 27 designates in FIG. 5 the metal wall of the mixing chamber 6, which metal wall 27 is coated on the inside with a synthetic resin coating 28. The mixing water nozzle 8 is inserted into an opening passing through the wall 27 and the synthetic resin sheathing 28, in which region a tube element 29 is formed. The end of this tubular member 29 facing the mixing chamber 6 has an externally threaded portion onto which a conically tapered ring member 3o is screwed towards the wall 27.

The water nozzle 8 including the ring member 3o is coated with synthetic resin 28
It is precisely placed inside.

Reference numeral 31 indicates a nut, and this nut 31 is connected to the pipe member 29.
and is adjacent to the outer wall 27. By tightening this nut 31, the ring member 30 is drawn into the rubber sheathing 28, so that it not only provides a firm seat for the water nozzle 8, but also at the same time, in particular against the interior space of the mixing chamber 6, the wall 27 and the plastic sheathing 28. A reliable sealing of the space between is provided.

Reference numeral 32 designates a coupling element known per se for the connection of water or other liquid conduits.

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing the entire continuous mixing device of the present invention, Fig. 2 is a side view of the agitator, and Fig. 3 is a side view of the continuous mixing device of the present invention.
An end view of the stirrer seen from the line, Figure 4 is IV-I of Figure 2.
FIG. 5 is a front view of the stirrer seen from the V line, and a partially longitudinal side view showing the nozzle of the mixing tube. In the figure, 1 is a mixing tube, 2 is a funnel-shaped container, 5 is a supply worm, 8 is a nozzle, 10 is an eccentric worm pump, 11 is a motor, 14 is a stirrer, 16 is a longitudinal axis, and 17 is a scraping rod. , 18 and 19 are bridge members, 20 is a supply spiral, 23 is a stirring arm, and 25 and 26 are spiral members. Patent applicant G.D. Ankergesellschaft Mitt LC)

Claims (1)

[Claims] 1) An agitator (14) consisting of a feed worm and a mixing spiral in a mixing tube (1) for continuously mixing water and construction materials.
), an eccentric worm pump (10) is connected almost coaxially to the stirrer, the shaft of the stirrer (14) is simultaneously used as a drive shaft for the eccentric worm pump (10), and the stirrer preferably has a A feed worm (5) formed from rubber is connected approximately coaxially in the mixing tube (1) opposite the eccentric worm pump (10), and is connected to the agitator (14) and the feed worm (
5) and the eccentric worm pump (10), the shaft of the supply worm (5) is the drive shaft for the agitator (14) and the shaft of the mixing tube (1). The mixing pipe (1) is fitted with a funnel-shaped container, the axis of which is inclined downwardly by an angle of 10° to 15° with respect to the horizontal plane, containing the construction material for the supply of construction material by the action of gravity into the mixing pipe (1).
is arranged in the region of the feed worm (5) via the feed worm (5), and the shaft of the stirrer (14) is flexibly connected to the eccentric worm pump (10) as well as the shaft of the feed worm (5). and continuous mixing equipment for construction materials. 2) The mixing tube (1) is provided at least in the area of the mixing chamber (6) with a thick-walled coating of smooth synthetic resin that is very resistant to abrasion. Continuous mixing equipment for water and construction materials. 3) The stirrer (14) is provided with at least one scraping bar (17) extending preferably parallel to the longitudinal axis (16).
A continuous mixing device for water and construction materials according to item 1 or 2. 4) According to any one of claims 1 to 3, characterized in that the stirrer (14) is provided with a feed spiral on its side facing the eccentric worm pump (10). Equipment for continuous mixing of water and construction materials. 5) The feed helix is constructed in segments and is preferably formed by at least two mutually oppositely spaced helical elements (25, 26). Continuous mixing device for water and construction materials as described in . 6) Water and construction material according to any one of claims 3 to 5, characterized in that the scraping rod (17) extends axially over the supply spiral (20). Continuous mixing equipment. 7) Any one of claims 3 to 6, characterized in that at least one stirring arm (23) is provided extending radially inward from the scraping rod (17). Continuous mixing equipment for water and construction materials as described in paragraph. 8) terminating the stirring arms (23) spaced apart from the longitudinal axis (16) of the stirrer (14), preferably each at least one radially inwardly extending stirring arm (23); Two scraping rods (17)
An apparatus for continuously mixing water and construction materials according to claim 7, characterized in that the apparatus is provided with: 9) The scraping rods (17) are formed to have a square or rectangular cross section, and are arranged rotationally symmetrically in the same direction as the respective longitudinal axes in relation to the rotational direction of the stirrer (14). Any one of claims 3 to 8
Continuous mixing equipment for water and construction materials as described in paragraph. 10) The scraping rod (17) is held by a substantially radially extending bridge (18, 19), which bridge has a joint function member connected to said rubber worm (5) on the one hand and said eccentric worm pump ( 10) and fixed for flexible connection.
A continuous mixing device for water and construction materials according to any one of items 9 to 9. 11) The stirring arm (23) has a rectangular cross section, the long side of which is arranged parallel to or at an angle to the longitudinal axis of the stirrer (14). A continuous mixing device for water and construction materials according to any one of the scope items 3 to 10. 12) A method according to claims 1 to 11, characterized in that a plurality of nozzles (8) for introducing water are installed at least partially along the mixing tube (1), preferably in a uniform distribution. A continuous mixing device for water and construction materials according to any one of the items. 13) Water according to claim 12, characterized in that the nozzle (8) is arranged in a part of the mixing pipe (1) close to the eccentric worm pump (10), preferably below it. and continuous mixing equipment for construction materials. 14) Continuous mixing device for water and construction materials according to any one of claims 1 to 13, characterized in that the motor (11) is flexibly coupled to the supply worm (5). . 15) Preferably, the entire joint connection is formed by an element connection of four-sided or other polyhedral appearance adjusted by play.
A continuous mixing device for water and construction materials according to any one of paragraphs.