SK78193A3 - Device for production of pump, mortal material - Google Patents

Abstract

A screw mixing device (4) which can be charged with dry material is followed coaxially by a screw pump (7). The screw mixing device (4) and the screw pump (7) have a common drive unit (6, 6a). The common axis, directed obliquely upwards in the conveying direction, encloses an angle of between 10 DEG and 30 DEG with the horizontal. The mixing element (5) of the screw mixing device has a first section designed essentially for conveying the dry material as far as a water connector (11) and a second section designed for mixing the dry material with the water. The dry material may be dry mortar or only binder. In the latter case, the screw mixing device (4) has, at the level of its second section, an opening at the top for charging with sand. <IMAGE>

Description

Equipment for the production of pumpable mortar materials on a construction site.

Technical field

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for producing pumpable mortar materials on a construction site, comprising a screw mixer, to which a dry material is continuously fed through the feed hopper and a connection arranged downstream of the feed hopper, a metered amount of water. means.

BACKGROUND OF THE INVENTION

Such a device has been proposed in the unpublished German patent application P 41 19 261.3. This device is filled with dry mortar, which is, irrespective of necessity, water added in the device, premixed for use, and differs from the prior art in that it can supply the finable mortar masses continuously. For this purpose, the screw mixer has several areas, a screw mixer arranged coaxially with respect to the screw pump, which is driven together with the screw pump as well as arranged above and parallel to the unit and operating a screw conveyor operating between its input. an orifice filled with dry mortar and between an outlet orifice connected to a unit arranged at the bottom thereof, a screw member which comprises a successive screw conveyor, a metering screw and a pre-mixing screw on a common shaft.

Described device, which is controlled by corresponding level indicators at the same time dosed water supply.

provides, first of all, a continuous coating with a constant composition. However, in order to produce a plaster or masonry mortar that is considerably stiffer compared to a continuous coating, in addition to replacing the screw pump with a correspondingly more powerful aggregate, further refurbishments must be carried out, in particular the replacement of all pre-mixers with other structures.

SUMMARY OF THE INVENTION

It is an object of the present invention to simplify the apparatus of the type mentioned at the outset, as well as to reconstruct it in converting the production of the material to a continuous coating for the production of plaster and masonry mortar and vice versa.

The object is achieved by a device according to the invention, in which both the screw mixer and the screw pump are arranged coaxially one after the other along the direction of transport of the axis provided with the horizontal plane and the screw mixer and the screw screw. the pump has a common drive unit and, on the other hand, the mixing part of the screw mixer has two sections, of which the first section is formed essentially to convey dry mortar of added mortar material to the water connection and the second section is designed to mix the dry mortar with water.

The proposed device has a substantially simpler construction than the device of the initially mentioned type. In particular, a single drive motor with additional transmission is sufficient for mixing and pumping. In addition, the modification of the apparatus in the manufacture of a continuous coating for the production of plastering and masonry mortar and vice versa is considerably simplified. In addition to the generally necessary replacement of the screw pump, only one mixer must be replaced.

Due to its simple construction, the proposed device can mainly be easily transported. In a design solution that has been tested in practice, the mixing part moves at a speed of 150 to 300 rpm and a screw pump delivers 70 to 100 liters of mortar mass per minute.

A further advantageous embodiment of the device which accelerates both its cleaning and its conversion is disclosed in claim 2.

By means of the solution as claimed in claim 3, a particularly uniform filling of the mixing part with dry mortar is achieved, thereby improving the mixing quality.

An exemplary embodiment as set forth in claim 4 solves the provision of a mixing part for the production of sprayed or masonry mortar.

In contrast, the solution referred to in claim 5 relates to providing a mixing part for producing a continuous coating which is considerably reduced compared to plaster or masonry mortar.

The device according to claims 1 to 5 requires, for use with the sand, a premixed dry material which, for example, comes from a silo erected at the site of the construction site under whose outlet the device is deposited with its filling hoppers. In addition, due to the transport costs, this ready-to-use and roughly 50% sand is a dry material which is more expensive than on-site, in the same proportion of sand and binder, mortar materials, for example cement and / or anhydrite recipes.

Therefore, it is an object of the invention to improve the proposed device so that it can also optionally be used for producing pumping mortar compositions, in particular continuous paint, from a dry binder and separately added sand.

This problem is solved in a device of the initially mentioned type in that the screw mixers and the screw rods are arranged coaxially in the direction of transport of the axis provided, which has an angle of 10 ° to 30 ° to the horizontal. gear and screw pump a common propulsion unit, the mixing part of the screw mixing unit having two sections, of which the first section is formed essentially for conveying as a binder of added dry material to the water connection and the second section is designed to mix the binder with water, and on the one hand, the screw mixing device has an aperture at the height of the second section of its mixing portion in its tubular sheath.

The device may furthermore be arranged as previously mentioned with reference to claims 2 to 5 for the installation according to claim 1.

It has been found that this device is particularly suitable for producing a continuous coating of binder, water and separately therefrom, subsequently into the mixing area of the sand supplied. Accordingly, the mixing part as set forth in claim 5 is suitable as the mixing part. This improvement according to the invention in the aforementioned apparatus, which works with a dry material premixed with a ready-to-use sand, serves as a basis for understanding that in case the passage, ie the feed power of the screw pump is greater than the feed power of the pre-mixer, the mixing area is only partially filled with the material. Thus, the mixing region has cavities filled with air, often in the form of separate air cushions, which are to some extent filled with the amount of sand used. Surprisingly, in this way a homogeneous pumpable mortar mass is formed in this way despite a very short mixing path. In principle, the air cavities required for the filling of sand can be formed by replacing the screw pump, which provides a continuous flow of mortar mass from the dry mortar and water, at a given number of rotations of the common shaft of the screw mixer and the screw pump. higher transport performance. It is preferable to increase only the number of revolutions of the drive correspondingly. Indeed, it has been shown that, from a certain number of revolutions, the amount of material that is conveyed from the feed hopper to the screw mixer, as opposed to what would be expected, remains essentially constant, especially as regards fine-grained material, so increasing the revolutions the conveying power of the screw pump is increased, thus creating only the necessary air-gap spaces. Depending on the size of the screw mixer and the geometrical shape of its mixing part, this effect occurs, for example, at a speed of 200 rpm, so that an increase in speed above this value leads to the desired air cushions in the binder-water mixture.

According to claim 7, a sand hopper is arranged above the sand dispensing opening provided in the casing of the screw mixer.

The required amount of sand can be loaded into the sand hopper. However, a constant mixing ratio is thus difficult to achieve. Therefore, according to claim 8, it is proposed that the sand hopper has a hopper throat in which a sand conveyor screw would be provided, driven by a driving motor arranged above the sand hopper. The sand conveyor screw may be combined with a sand scraper or other contacting body that moves along the inner wall of the hopper to ensure that possibly wet sand is evenly filled. The rotational speed of the sand conveying screw is selected to provide the desired mixing ratio, for example 1: 1 of binder and sand.

The sand hopper may be filled arbitrarily, for example also automatically from the silo using a known fill level detector provided in the hopper. A simpler option is provided in claim 9, wherein it is assumed here that a sand metering belt conveyor is terminated at the sand hopper inlet. Suitable metering conveyors are known per se. They have a shaft on the entrance side, into which sand is loaded, for example, with a shovel. By means of the adjustable cross-section gap, it is then possible to adjust the amount of sand drawn per unit of time for this belt which moves at a constant speed.

It is also recommended to make the transfer end of the metering belt conveyor connectable to the sand hopper. According to claim 10, the sand hopper has a vertical center axis and is provided with a rotatable holder about the center axis for the transfer end of the metering belt conveyor, the holder of the sand conveyor screw drive being also mounted on the holder. The holder can thus be placed in a position corresponding to the local conditions in which the metering belt conveyor is.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to the drawing. The devices according to the invention are shown schematically and in simplified form in the drawings.

In FIG. 1 is a side cross-sectional view of a device that is configured to be filled with dry mortar. In FIG. 2 shows the mixing part of the device according to FIG. 1, suitable for the production of mortar for spraying plaster or masonry. In FIG. 3 shows the mixing part of the device according to FIG. 1 to produce a continuous coating.

In FIG. 4 is a side view corresponding to FIG. 1, but further provided with a device which can also be optionally filled with binder and sand.

DETAILED DESCRIPTION OF THE INVENTION

The device of FIG. 1 has a funnel spout 1 of a dry mortar force (not shown) connected via a flexible connection tube 2, for example a short hose section or a flexible bladder, to an opening in the lid 3a of the filling hopper 3 which opens into a screw mixer 4. 5, which is shown in FIG. 2, but can also optionally be replaced by the mixing part 9 shown in FIG. 3. The mixing part 5 is driven by a schematically indicated electric motor 6 with a pluggable gear 6a with a constant speed of several hundred revolutions per minute. A screw pump 7 having a known construction, the conveyor screw of which is non-rotatably connected to the mixing part, is connected to the outlet side of the screw mixer 4 by means of a flange.

5. The screw pump Z transports in the direction of the pipe or hose line 8, which leads to the place of use.

The screw mixing device 4 and the screw pump 7 are arranged coaxially in an axis descending in the conveying direction which is at an angle of 10 ° to 30 ° with the horizontal plane.

The device is mounted as a whole only on the symbolic bogie 10. During transport, the flexible coupling tube 2 is released either from the silo outlet 1 or from the charging hopper 3.

In order to prevent the dry mortar from falling directly out of the silo into the screw mixer 4, which could cause operational failures, the filling hopper 3 has an inclined wall 3b, which acts as a chute. This inclined wall 3b extends substantially transversely to the conveying direction and, with the electric motor 6 adjoining the electric motor 6, forms an angle β with, for example, 30 ° to 50 ^e . The feed opening in the lid 3a of the feed hopper 3 is provided above the inclined wall 3b so that the dry mortar first falls on the wall 3b from above and then slides along it downwards into the screw mixer 4. Here the mixing part 5 is first conveyed in the direction of the horizontal connection 11 symbolically indicated the water supply and then mixed with the water, partly due to the mixing part 5 and partly due to the attractive force being fed to the screw pump 7. During this, water from the metering device 13 is continuously supplied in prescribed doses via the water connection 11 and the symbolically shown pipe 12. The metering device 13, which may be of any design, is connected to the local water supply network by means of a solenoid valve 14, which can be designed simultaneously as a pressure relief valve.

Next to the metering device 13, there is a symbolic representation of an electrical cabinet 15 which controls the entire device, in particular in dependence on the output signal or in the charging hopper 3 at a suitable location of the arranged level indicator. This shows that the filling hopper 3 is permanently filled with dry mortar. At the same time, the filling level detector 16 can ensure, for example, switching on the vibrator at the force provided above or opening the slide closure at the outlet of the silo until the specified filling level is reached. These details, which are known per se and are not part of the invention, are not shown.

Despite the simple construction, the device according to FIG. 1 to produce mortar for plastering or masonry as well as for continuous coating. This is achieved by using specially designed mixing parts 5, 9 adapted to the corresponding material, which can be exchanged very easily together with the replacement of the screw pump 7, which is necessary in each case, since in the case of plaster or masonry mortar production more efficient than in the production of a continuous coating, since it has a substantially more fluid consistency. For easy interchangeability of the mixing part 5, 9, the drive assembly, formed by the electric motor 6 and the gear 6a, is connected to the housing of the screw mixer 4 so that it can be folded out, which is not shown. In addition, the mixing part 5, 9 is connected to the drive unit shaft and to the drive side of the screw conveyor screw 7 in a force-tight manner by means of the clamping teeth 41, 42.

The mixing part 5 shown in FIG. 1 and 2, is used for the production of plaster mortar or masonry mortar. This mixing part 5 has, according to FIG. 2, a first section 51 of a through-worm 50 with approximately three and a half turns, as well as a second section 52 having approximately the same length, is formed of screw segments 53 and has a larger pitch compared to said screw 50. By means of the relatively large pitch of the screw segments 53 of the second section 52, a particularly good mixing effect is achieved. Advantageously, the periodic gaps 54 prevent this large pitch from causing a correspondingly large conveying speed in the axial direction. In fact, a high conveying speed would result in the mixing time being too short and homogeneous mixing being impossible. Also important for operation is the axial bridge 55, which connects the peripheral edges of the axially successive worm segments 53 to form a wall squeegee. The first section 51 substantially corresponds to the dry area of the screw mixer 4, while the second section 52 represents its wet area.

The mixing portion 9 shown in FIG. 3, is used to produce a continuous coating. It also contains two functionally different sections. The first section 91 has individual, flat mixing blades

90, which are set against the radial plane by an angle corresponding to the direction of travel, as in FIG. 2 running from right to left and the desired traffic speed. It is followed by a second section 92 which corresponds to the wet area and is formed by similar mixing vanes 93, two of which each arranged in the same axial plane form a pair of adjacent mixing vanes 93, the peripheral areas of which are connected by an axial bridge 95. four such bridges 95 which are uniformly distributed around the circumference of the mixing part 2 and which are offset in the axial direction by one length of the bridge 95. The function of the bridges 95 corresponds to the function of the bridge 55 in FIG. 2. 2, the large gaps between the mixing vanes 90, 93 are formed according to the relatively fluid consistency of the continuous coating and thus prevent high inlet pressure from entering the screw pump 7 in FIG. First

At both ends of the mixing portion 5 in FIG. 2 and the mixing part 9 in FIG. 3, the drive and output connecting elements in the form of webs or clamping teeth, which form the carriers 41 and 42, respectively, are apparent.

In FIG. 4 shows a further preferred embodiment of the device according to FIG. 1. This further advantageous device is used for producing pumpable mortar materials from binder and sand, in particular for producing a continuous coating. Therefore, here the screw mixing device 4 is provided with a mixing part 9 according to FIG. 3. All the others, already in FIG. 1, the parts shown are provided with the same reference numerals. While the device of FIG. 1, however, by means of its filling hopper 3 with a pre-mixed dry mortar ready for use, the device according to FIG. 4 intended primarily for the production of pumpable mortar on the construction site, in particular a continuous binder and sand coating. The sand comes from a construction site and is added via a sand hopper 20 whose tubular chute 20a of the hopper opens above the sand pouring hole 4a in the casing of the screw mixer 4. The sand pouring hole 4a is downstream of the water connection 11.

The sand is fed to the sand hopper 20 by means of a symbolically illustrated dosing belt conveyor 22, which discharges sand from the feed shaft 23, which is generally in the shape of a hopper, in an amount that is adjustable by the orifice 23a. adjustable in the direction shown by the double arrow. The metering belt conveyor 22 rests, at its transfer end, on a holder 24 which is arranged rotatable (not shown) at the upper edge of the sand hopper 20 and furthermore carries a drive motor 25 which drives the sand transport screw 26 arranged in the hopper neck 20a. The sand hopper 20 has an insert 26a on its inlet side. which is arranged at a small distance parallel to the inner wall of the sand hopper 20 and since it circulates with the sand conveyor screw 26, it acts as a sand scraper. The rotational speed of the drive motor 25 and thus of the sand conveyor screw 26 is chosen so as to produce the desired mixing ratio of, for example, 1: 1 binder relative to the sand. This number of revolutions may be 40 to 60 rpm, while the number of revolutions of the drive unit 6, 6a which supplies the binder may be, for example, 200 to 400 rpm. The amount of sand fed to the sand hopper 20 by the metering belt conveyor 22 is adjusted so that a sufficient amount of sand is permanently available in the sand hopper 20.

The improved device of FIG. 4, of course, must also be filled with ready-mixed, premixed dry mortar. The sand supply components described above are then not functional. The sand hopper 20 may either remain in place or be released from the extension 21 and then closed by the corresponding lid.

Claims (10)

PATENT CLAIMS A plant for the production of pumpable mortar masses on a construction site, comprising a screw mixer into which the feed hopper is continuously fed dry material and a connection provided downstream of the feed hopper, a metered amount of water and a screw pump connected downstream of the screw mixer. characterized in that, on the one hand, the screw mixing devices (4) and the screw pump (7) are arranged coaxially one after the other along an axially arranged axis which has an angle (α) of 10 ° to 30 ° to the horizontal a screw mixer (4) and a screw pump (7) a common drive assembly (6, 6a) and secondly, the mixing part (5, 9) of the screw mixer (4) has two sections (51, 52; 91, 92) of which the first section (51; 91) is formed substantially for conveying the added mortar material as dry mortar up to the water connection (11) and the second section (52; 92) is designed to mix the dry mortar with water. Apparatus according to claim 1, characterized in that the mixing part (5, 9) of the screw mixer (4) engages the screw pump shaft (7) and the drive unit shaft (6, 6a) by means of clamping teeth for easy interchangeability. (41, 42) and the drive assembly (6, 6a) is connected to the housing of the screw mixer (4) by tilting or releasably releasing. Device according to claim 1 or 2, characterized in that the adjoining wall (3b) of the feeding hopper (3) for supplying the dry material is disposed substantially transversely to the conveying direction (6, 6a). a vertical plane inclined at an angle (β) of 30 ° to 40 ° to extend the feed hopper (3) upwards, and the feed hopper (3) has a feed opening whose projection surface falls on this inclined wall (3b). Apparatus according to one of Claims 1 to 3, for the production of hand plaster, characterized in that the first section (51) of the mixing part (5) consists of a through-worm (50) with two to four turns and the second section (52) periodically. an intermittent screw of approximately the same length but with a larger pitch of two to three turns, as well as an axial bridge (55) which connects corresponding circumferential areas of the axially successive worm segments (53) to form a wall wiper. according to one of the claims 1, characterized in that the parts (9) consist A continuous coating apparatus, a mixing section (91) for production up to 3, in which the first of the individual flat mixing vanes (90) are set relative to the radial plane at an angle adapted to the conveying direction and the conveying speed and the second section (92) of similar mixing vanes (93), of which two adjacent mixing vanes (93) arranged in the same axial plane form pairs whose peripheral regions are connected by axial bridges (95) and at least two of said bridges (95) are arranged offset in the circumferential direction by 180 ° and preferably by the length of the bridge (95) in the axial direction. Apparatus according to claim 1 and / or one of claims 2 to 5, characterized in that, on the one hand, the screw mixing device (4) and the screw pump (7) are arranged coaxially one after the other about a horizontal plane of angle (α) of 10 ° to 30 °, on the one hand the screw mixer (4) and the screw pump (7) have a common drive unit (6,6a) and on the other hand it has a mixing part (5; 9) 4) two sections (51, 52; 91, 92) of which the first section (51; 91) is formed essentially for conveying as a binder of added dry material to the water connection (11) and the second section (52; 92) is formed on the binder to be mixed with water, and secondly, the screw mixing device (4) at the height of the second section (52; 92) of its mixing part (5; 9) in its tubular sheath has an aperture (4a) upwards. Apparatus according to claim 6, characterized in that a sand hopper (20) is emptied into the sand filling opening (4a). Device according to claim 7, characterized in that. wherein the sand hopper (20) has a hopper throat (20a) in which a sand conveyor screw (26) is provided, driven by a drive motor (25) provided above the sand hopper (20). Apparatus according to claim 7 or 8, characterized in that the metering belt conveyor (22) is terminated at the inlet opening of the sand hopper (20). Apparatus according to claim 9, characterized in that the sand hopper (20) has a vertical central axis and is provided about this central axis with a rotatable holder (24) for the transfer end of the metering belt conveyor (22), wherein on the holder (24) a drive motor (25) of the sand conveyor screw (26) is also mounted.