EP1034906B1 - Process for preparing a building material - Google Patents

Abstract

The method and appliance for the continuous mixing of building materials incorporate a feeder (2) conveying the dry or pourable material, a dispenser (3), and a subsequent and preferably continuous mixer chamber (6). The admixture (11) of water is controlled by a regulatable valve or shut-off element (13) connected to the control containing an electronic register or and a programmable calculator unit. The quantity of water fed through the inflow (12) and conveyor is controlled according t the quantity of building material.

Description

The invention relates to a method for continuous preparation a dry or free-flowing mixture of building materials such as screed, in particular liquid screed, concrete, plaster, mortar or the like with a mixing liquid, for example with water, the Building material mixture dosed in quantity and the amount to be added of mixing liquid to the metered amount of the building material mixture is voted.

Such a procedure is known for batch mixers. A predetermined amount of dry or free-flowing Building material mixture is the corresponding amount of mixing liquid admixed. In this way, the ratio of building material mixture very precisely specified for the mixing liquid and an optimal result achieved in terms of plasticity, reaction of additives, etc. become.

When continuously mixing a building material mixture with Mixing liquid, for example with the help of a continuous mixer is from a fixed delivery rate belonging to this mixer Dosing device run out and the mixing liquid accordingly specified. If the result achieved differs too much from that the desired consistency of the mixed building material off, the consistency is set (water-binder factor) by regulating the amount of the mixing liquid, which of the Processors at the construction site themselves after individual assessment is carried out. So the result depends on the experience and what the user of the continuous mixer does not rarely insufficient results with corresponding disadvantages leads for the later building. Through this previously known The process thus fluctuates in large areas Water-binder factor or water-cement factor that even may lie outside of established standards and then not to one standard-compliant building. A procedure of this kind is over EP-A-0 255 633.

There is therefore the task of a procedure and also one Device for the continuous preparation of a binder containing building material mixture with a mixing liquid create, the ratio of mixing liquid to binder should be within predetermined and / or standardized limits. It So the benefits of a continuous mixing of a Building material mixture with mixing liquid with that of a correct one Liquid binder factor can be combined.

The surprising solution to this seemingly contradictory task is that the wear is one for dosing the building material mixture serving dosing device and thus the decrease in the supply the building material mixture depending on the running time and / or the throughput determined per unit of time and the supply of the mixing liquid reduced proportionally to this wear of the metering device and / or the speed of the drive of the metering device be increased in proportion to this wear.

So it becomes the respective "individual" lawfulness of the Wear of a particularly belonging to a continuous mixer Dosing device detected and in the control or regulation of Amount of mixing liquid taken into account so that the correct one Liquid binder factor in each case despite an increase in Wear and an associated reduction in the Throughput or the metered flow rate obtained remains. So it can by the procedure according to the invention the amount of the mixing liquid closely related to the actual supply of the Building material mixture and the binder contained therein adapted so that the specified DIN standards or permitted tolerances can be met without a user due personal or visual reviews manual settings the supply of the mixing liquid with corresponding error possibilities must perform. Because the wear of the dosing device is determined in each case, this method can be used for different Dosing devices and / or continuous mixers are used, because each such metering device has its own wear behavior be taken into account in a targeted manner.

It is particularly favorable if the increase in the Wear of the metering device repeated this after Transport of specified delivery quantities or a specified Throughput and / or according to predetermined operating or running times measured with regard to their different wear conditions and that which was achieved in such a state of wear Flow rate can be determined and if the determined wear-related Decrease in throughput conveyed by the metering device an electronic control or computer unit is entered, which is the supply for the mixing liquid, for example a Valve or the like, adapted to the reduced delivery rate regulates or controls. So it can be done through trials, for example the usual for respective types of dosing devices Wear behavior and thus their own acceptance of the Throughput determined and the corresponding determined thereby Curve in the control for the supply of the mixing liquid be programmed. Thus, all devices with one such metering device from the outset over that Time that the dosing device despite the increasing Wear is used, the right ratio of building material mixture and binders to the mixing liquid. Also through an increase in the speed of the metering device, for example a dosing screw, the increase in wear and tear the associated decrease in output or throughput be compensated. In any case, it is favorable that the admixture the amount of mixing liquid no longer depends on individual experience depends, but on predetermined machine sizes, namely the Wear and thus a decrease in throughput right from the start programmed is adjusted. By using an electronic Control or computing unit and the entry of the corresponding values there is the further advantage that the user has one Provide proof of the quality of the mixed building material can, because the respective merged amounts of building material on the one hand and the mixing liquid on the other hand in the computer can be saved and retrieved.

A further embodiment of the method according to the invention can consist in the fact that, in particular through experiments for various products or building material mixtures determined increase the wear of the metering device from time to time, for example during maintenance work, checked and / or measured and compared to those previously determined in the experiment or possibly auchrechnerischerfaßtenMengeneventuellfestgestellteAbweichungen the control or computer unit can be entered.

So there can be different wear behavior different Products or building material mixtures recorded and in the invention Procedures are taken into account.

If, for example, maintenance work reveals that the Dosing device worn out but still usable is the specific wear condition as a correction factor or also as confirmation of the previously entered relevant values be used. After a certain degree of wear and tear then the dosing device is replaced or repaired, for example by welding back to the initial values of their Conveying capacity or its throughput. Than are of course the control or computer unit or the memory corresponding wear values of such a repaired metering device to enter, which are determined by experiments or on Experience values can be based.

A dosing screw can be selected as the dosing device and its Loss of volume in the course of the activity and / or the reduction the building material mixture delivered by it and the tax or Computer unit or one of these associated memories can be entered. A dosing screw is a special one expedient and robust within a dosing channel Dosing device in which the increase in wear due to Decrease in the outer diameter is also easily determined and can be measured.

A device for the continuous dressing of a dry or pourable building material mixture such as screed, concrete, mortar, plaster or the like with a mixing liquid, for example with Water, with a feed device for the building material mixture, one Dosing device and a downstream mixing chamber in particular a continuous mixer with a feed for the Mixing water and a control for the supply of the Mixing water can solve the above problem characterized in that in the supply line for the Mixing water provided an adjustable valve or shut-off device which is connected to the controller, which is an electronic Memory and / or a programmable computer unit for Save the - per unit of time or depending on throughput - each decreasing due to wear, the mixing chamber actually has supplied amount of the building material mixture, so that the amount of the mixing water supplied by the inlet and the inlet respective amount of the building material mixture controlled accordingly is feedable.

Since the control over this memory or this computing unit this decrease curve for the throughput of the metering device contains, it can accordingly the delivery of the mixing liquid within the framework of specified standards or tolerances and automatically Carry out the entered program as follows. Because this makes each combined amounts of the building material mixture and the mixing liquid included in the computer or memory at different times they can also be used at any time to prove the quality of the made-up building material mixture can be called up. Thus the Water requirements for each product are limited within its tolerance range and it is avoided that concrete or screed or any other Building material is watered over or possibly made with too little water becomes. Rather, according to the respective consumption Dry material or building material mixture the required Mixing water programmed using the control or computer unit and be fed precisely. Because both sizes or quantities are over one central controller or memory can be recorded in the machine, the desired precise regulation and assignment of the results the mixing quantities required. You can in this Controllers or computers also the others for the water-cement factor or the water binder / dry material factor as well the entire material and water consumption are stored.

In such a device for continuously switching on a dry or free-flowing building material mixture can solve the problem Task and to carry out the method according to the invention also be provided that a control for the speed of the drive motor is provided and that this control an electronic Memory and / or a programmable computer unit for storing which - per unit of time or throughput-dependent - due to wear decreasing amount dosed by means of the dosing device of the building material mixture, so that the wear-related decrease the metered building material mixture by increasing the speed of the drive motor can be compensated.

It can also be the wear-related decrease in the metered amount Building material mixture by increasing the speed of the drive motor be compensated, i.e. due to an increased engine speed, the added quantity can be brought back to the desired value, although the dosing screw actually wears out due to its wear promotes a reduced amount.

It is also possible that a control of a controllable Valves or shut-off devices and a control for the speed the drive motor is provided and an electronic memory and / or a programmable computer unit for storing the - per unit of time or depending on throughput - each due to wear decreasing supply of the building material mixture for a combined increase the speed of the drive motor and reducing the water supply is provided.

So it is also possible to decrease the wear-related to combine metered building material mixture in that the supply the mixing fluid is reduced and the engine speed is increased, to get the right mix ratio again.

Especially when combining one or more of the above Features and measures can be the dry or free-flowing building material mixture by means of a volumetric dosage, preferably by means of a dosing screw into the mixing chamber continuously operating continuous mixer. About the engine speed and the density of the building material mixture the amount calculated and using that in the computer or memory stored water value or water binder dry material factor the correct amount of mixing liquid over a Control unit set. Wear and tear of the volumetric dosing or the dosing screw is used by this calculator takes into account so that the values are automatically dependent be corrected from this wear or tear.

Fig.1

einen Längsschnitt eines Durchlaufmischers mit horizontaler Dosierschnecke und Mischwelle und einer vor der Dosierschnecke und deren Dosierrohr angeordneten Zuführeinrichtung für eine trockene oder rieselfähige Baustoffmischung im Längsschnitt,

Fig.2

einen Teil der Dosierschnecke im Neuzustand,

Fig.3

den Teil der Dosierschnecke gemäß Fig.2 in einem mittleren Verschleißzustand,

Fig.4

den in den Figuren 2 und 3 dargestellten Teil der Dosierschnecke in abgenutztem Zustand sowie

Fig.5

den in Fig.1 dargestellten Durchlaufmischer mit einem Mikrokontroller bzw. einer Steuer- oder Regeleinheit, über die die Zufuhr der Anmachflüssigkeit abhängig vom Verschleiß der Dosierschnecke gesteuert oder geregelt wird.

An embodiment of the invention is described below with reference to the drawing. It shows in a partially schematic representation:

Fig.1

2 shows a longitudinal section of a continuous mixer with a horizontal metering screw and mixing shaft and a feed device for a dry or free-flowing building material mixture arranged in front of the metering screw and its metering pipe, in a longitudinal section,

Fig.2

part of the dosing screw when new,

Figure 3

the part of the dosing screw according to FIG. 2 in a medium state of wear,

Figure 4

the part of the metering screw shown in Figures 2 and 3 in the worn state and

Figure 5

the continuous mixer shown in Figure 1 with a microcontroller or a control or regulating unit, via which the supply of the mixing liquid is controlled or regulated depending on the wear of the metering screw.

A device designated as a whole by 1 (FIG. 5) is used for Preparation of a pourable building material mixture such as screed, concrete, Mortar, plaster or the like with a mixing liquid in which Usually with water. For this purpose, the device 1 has a feed device 2, in Fig.1 and 5 by an inlet nozzle and the vertical Arrow Pfl is indicated. At this point, the still dry Building material mixture are filled into the device 1, be it using sacks, be it directly from one above Storage or silo containers.

The device 1 also has a metering device 3 with a Dosing screw 4 in a metering tube 5 and one downstream of it Mixing chamber 6, in which a mixing shaft 7 with Mixing tools 8 is housed, the mixing shaft 7 in Continuation of the dosing screw 4 and a conveyor shaft 9 below the feed device 2 extends so that a single drive motor 10 for driving both the conveyor shaft 9 and this in Direction of conveyance following dosing screw 4 and the mixing shaft 7 with the mixing tools 8 is sufficient.

Overall, therefore, in the exemplary embodiment according to FIGS 5 a horizontally arranged continuous mixer is also provided a feed 11 (Fig.5) and an inlet 12 for the mixing water in the area of the mixing chamber 6. You can see in Fig. 5 in the feed line 11 for the mixing water a valve or Shut-off device 13, which in a manner to be described with a Microcontroller or a control device or Control unit is preferably connected in the form of a computer, so that the amount of through the feed 11 and the inlet 12 of the Mixing added mixing water can be controlled or regulated can.

A control or regulating unit 14 is shown in FIG an electronic memory and / or a programmable Computer unit for storing per time unit or depending on throughput each decreasing due to wear, actually supplied and metered amounts of the building material mixture is used the supply of the mixing liquid by means of the valve or Shut-off device 13 changed in the way the dosing screw 4 worn out more and more over time due to throughput or is worn out.

Figures 2 to 4 show how the outer diameter the dosing screw 4 and the screw flights attached to it 4a from new condition to medium wear to Uselessness decreases. The degree of wear shown in Figure 4 results in practically no dosing promotion of sufficient quantity, so that the dosing screw 4 is then removed and replaced or for example by cladding back into one state must be moved, which corresponds approximately to the new condition.

This wear shown schematically in Figures 2 to 4 the dosing device used for dosing the building material mixture 3 or their dosing screw 4 and thus the decrease in Supply of the building material mixture to the mixing chamber 6 depending on the Runtime and / or throughput can be - for example in Try or model tests - determined and the supply of Mixing liquid via the valve 13 proportional to this Wear and the associated reduction in throughput can be reduced. In Figure 5 is through the connecting line 15th this connection is shown schematically, because this line 15 leads from the dosing device 3 to the control or regulation Computer unit 14. In practice, this is done by tests determined wear of the dosing screw 4 in the computer mentioned for example entered via a keyboard, that is the line 15 is only intended and does not represent a line.

To determine the increase in wear of the dosing device 3 according to Figure 2 to 4, this can be repeated after transportation predetermined delivery rates and / or according to predetermined actuation or Running times with regard to their different wear conditions and those still provided in these wear conditions Flow rate are measured, after which the wear-related determined Decrease of the conveyed by the metering device 3 Throughput of the electronic control or computing unit 14 is entered. As already mentioned, this then regulates or controls the supply of the mixing liquid via the valve or Shut-off device 13, which can be opened more or less.

The increase in the Wear of the metering device 3 or the metering screw 4 from time to time, for example during maintenance work checked and measured, so that possibly detected deviations from that of the control and computer units 14 entered values can be used as correction values, to the accuracy of the dosing of the mixing liquid with the help the control or computer unit 14 to increase again.

The dosing screw 4 provided in the exemplary embodiment has the advantage that the wear is particularly easy over their Volume loss can be measured, with the volume loss due to wear proportional to the decrease in throughput is. This regularity can easily be determined by experiment and program into the control or computer unit 14.

In Fig.5 it is also indicated that it is also possible to wear-related decrease in the metered building material mixture to compensate for an increase in the speed of the drive motor 10, reducing the water supply or increasing the Motor speed optionally, but possibly also used in combination can be.

There is also an input 16 on the control and computer unit 14 indicated over which the water requirement, the tolerance range regarding the relationship between the building material mixture and the mixing liquid or mixing water and other experimental or empirical determined data and also the correction data already mentioned, for example, entered from maintenance and actual consumption can be. At the exit 17, the user can see the material consumption, the fill level in the area of the feed device 2 provided storage container, the water consumption and also the Running times of the drive motor 10, that is data for quality assurance retrieve or query.

For preparing a dry or free-flowing mixture of building materials the mixture of building materials becomes quantitative with a mixing liquid dosed and the amount of mixing liquid to be added to this dosed amount of the building material mixture matched. The Wear of one used for dosing the building material mixture Dosing device and thus the decrease in the supply of the building material mixture depending on the runtime and / or the throughput of these Dosing device 3 determines and the supply of the mixing liquid reduced in proportion to this wear and / or speed of the drive motor 10 of the metering device 3 proportional to this Wear increases so that the building material mix with a continuous working or continuous mixer turned on and still one correct ratio between the building material mixture and the Mixing liquid can be obtained.

Claims (7)

1. Process for continuously mixing a dry or pourable mixture of construction materials such as flooring screed, particularly pourable screed, concrete, plaster, mortar or the like, with a mixing liquid, for example with water, in which the mixture of construction materials is measured in and the quantity of mixing liquid to be added is matched to the quantity of building mix measured in, characterised in that the wear of a metering device (3) serving for measuring the building mix and hence the reduction in the supply of building mix is determined as a function of the running time and/or the throughput and the supply of mixing liquid is reduced in proportion to this wear of the metering device and/or the speed of driving the metering device (3) is increased in proportion to this wear.
2. Process according to claim 1, characterised in that in order to determine the increase in the wear on the metering device the latter is measured repeatedly after conveying given quantities and/or after given running times to determine its different states of wear and the amount conveyed in such a state of wear is determined, and the wear-induced reduction in the throughput conveyed by the metering device (3) which has thus been determined is input into an electronic control or computer unit (14) which regulates or controls the supply means for the mixing liquid, e.g. a valve or the like, in accordance with the reduced delivery.
3. Process according to claim 1 or 2, characterised in that the increase in the wear of the metering device (3) determined, in particular, by testing with different products or building mixes is checked and/or measured from time to time, for example during maintenance work, and any deviations found are input in the control or computer unit (14).
4. Process according to claim 1 or 2, characterised in that a metering screw (4) is used as the metering device and its loss of circumference in the course of operation and/or the reduction in the building mix which it delivers are measured and input into the control or computing unit.
5. Apparatus (1) for continuously mixing a dry or pourable building mix such as flooring screed, concrete, mortar, plaster or the like with a mixing liquid, for example water, with a feed device (2) for the building mix, a metering device (3) and a mixing chamber (6) downstream thereof, particularly a throughflow mixer with a supply means for the mixing water and a control for the supply means (11) for the mixing water for performing the process according to one of claims 1 to 4, characterised in that a regulatable valve or blocking member (13) is provided in the feed line (11) for the mixing water, said valve or blocking member (13) being connected to the control which comprises an electronic memory and/or a programmable memory unit for storing the quantity of building mix actually supplied to the mixing chamber, per unit of time or dependent on throughput, reduced by the wear, so that the quantity of mixing water supplied through the supply means (11) and the inlet (12) can be supplied in a controlled manner in accordance with the actual amount of building mix.
6. Apparatus (1) for continuously mixing a dry or pourable building mix such as flooring screed, concrete, mortar, plaster or the like with a mixing liquid, for example water, with a feed device (2) for the building mix, a metering device (3) and a mixing chamber (6) downstream thereof, particularly a throughflow mixer with a supply means for the mixing water and a control for the supply means (11) for the mixing water for performing the process according to one of claims 1 to 4, characterised in that a control is provided for the speed of the drive motor (10) and this control comprises an electronic memory and/or a programmable computing unit for storing the quantity of building mix metered by means of the metering device (3) per unit of time or dependent on throughput, and reduced as a result of wear, so that the wear-induced reduction in the quantity of building mix metered in can be compensated by increasing the speed of the drive motor (10).
7. Apparatus according to claim 5 or 6, characterised in that a control is provided for a regulatable valve or blocking member (13) and a control is provided for the speed of the drive motor (10) and an electronic memory and/or a programmable computing unit is provided for storing the reduction in the supply of building mix caused by wear, per unit of time or dependent on throughput, for increasing the speed of the drive motor (10) and in conjunction therewith reducing the supply of water.

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