CZ176593A3 - Apparatus for the production in the site of mortars suitable for pumping - 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

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for producing pumpable mortar materials at a construction site, comprising a screw mixer, into which the feed hopper is a continuously feedable dry material and a connection provided downstream of the feed hopper, a metered amount of water. worm agitator.

Do - ® £ hn

Such a device has been proposed in the unpublished German patent application P 41 19 261.3.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, irrespective of necessity, in the water addition device, is premixed for use and differs from the prior art in that it can deliver pumpable mortar materials continuously. For this purpose, the auger mixer has a plurality of mixing regions, i.e. a screw mixer arranged coaxially with respect to the auger pump, which is driven together with the auger pump, as well as an auger conveyor which is arranged above and parallel to the unit. with its inlet opening filled with dry mortar and between the outlet opening connected to the unit arranged underneath, a worm member consisting of a conveyor screw, a metering screw and a pre-mixing screw on a common shaft.

The described device, which is controlled by the corresponding filling level detectors at the simultaneous dosing of the water supply, provides primarily a continuous coating with a constant composition. However, in order to produce a mortar for plastering or masonry that is substantially more dense than a continuous coating, in addition to replacing the worm pump with a correspondingly more powerful aggregate, further refurbishments must be carried out, in particular the replacement of all pre-mixers with other structures.

Substance_of the invention

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 when changing the production of a continuous coating material for the production of plaster and masonry mortar and vice versa.

This object is achieved by a device according to the invention, in which both the screw agitator and the screw pump are arranged coaxially one after the other along an axially arranged axis which forms an angle of 10 ° to 30 ° with the horizontal plane. the pump has a common drive unit, and on the other hand, the mixing part of the screw mixer has two sections, the first section being formed essentially for conveying as dry mortar the added mortar material up to the water connection and the second section being designed to mix the dry mortar with water.

^{in an} uprooted device it has a substantially simpler construction than the device of the initially mentioned type. In particular, one single drive motor with a possible gearbox is sufficient for mixing and pumping. Moreover, the modification of the apparatus in the production of a continuous coating for the production of mortar for plastering and masonry and vice versa is considerably simplified. In addition to the generally necessary screw pump replacement, only one mixing part needs to be replaced.

Due to its simple construction, the proposed devices are particularly easy to transport. In the embodiments tested in practice, the mixing part is at a speed of 150 to 300 rpm and the 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 embodiment mentioned in claim 3, a particularly uniform filling of the mixing part with dry mortar is achieved and thus the mixing quality is improved.

The embodiment shown in claim 4 solves the formation of a mixing part for the production of sprayed or masonry mortar.

In contrast, the embodiment of claim 5 relates to providing a mixing portion for producing a continuous coating that is substantially thinner compared to mortar for plaster or masonry.

The device according to claims 1 to 5 requires, for use with perfectly sand, a premixed dry material which, for example, comes from a silo built on site, under whose outlet the device is deposited by its filling hopper. Among other things, because of the transport costs, this ready-to-use and roughly 50% sand-based dry material is always more expensive than on-site at the same proportions of sand and binder-made mortar, for example cement and anhydrite recipes. .

Accordingly, the invention has the further object of improving the proposed device so that it can also optionally be used for producing pumping capable mortar compositions, in particular a continuous coating, of dry binder and separately added sand.

This object is solved by a screw mixer and a screw pump arranged coaxially in the direction of transport in the direction of transport, which forms an angle of 10 ° to 30 ° with the horizontal plane, and a screw mixer. and the screw pump common to the drive assembly, on the one hand, the mixing part of the worm mixer has two sections, of which the first section is formed essentially for conveying the dry material added as a binder to the water connection and the second section is designed for mixing the binder with water. an auger mixer at the height of the second section of its mixing portion in its tubular jacket at the top of the sand pouring hole.

The device may further be arranged as previously described with reference to claims 2 to 5 for the device according to claim 1.

This device has proven to be 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 foregoing said apparatus, which works with a dry material premixed with sand and suitable for immediate use, is based on the fact that if the passage, i.e. the conveying capacity of the screw pump, is greater than the conveying capacity of the pre-mixer, the mixing area is filled

- Only partially. 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! it is possible in this way to produce a homogeneous pumpable mortar mass despite a very short mixing path. In principle, it is possible in

to fill the sand with the necessary air cavities by replacing the worm agitator and the worm pump at a given number of revolutions of the common shaft of the worm agitator and the worm pump, which provides a continuous flow of mortar mass from dry mortar and water . However, it is preferable to increase only the drive speed correspondingly. Indeed, it has been shown that, from a certain number of revolutions, the amount of material which is conveyed from the feed hopper to the auger mixer, as opposed to what would be expected, remains substantially constant, especially when it is a fine-grained material, only the conveying capacity of the screw pump is increased, thus creating only the necessary air intermediate spaces. Depending on the size of the screw agitator and the geometrical shape of its mixing part, this effect is produced, 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 water-binder mixture.

According to claim 7, a sand hopper is provided above the sand-filling opening provided in the housing of the auger mixer.

The required amount of sand can be loaded into the sand hopper. However, a constant mixing ratio is 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, driven by a driving motor arranged above the sand hopper, would be provided. A sand scraper or other tactile member that moves along the inner wall of the hopper may be combined with the sand conveying screw to ensure that possibly wet sand is evenly filled. The rotational speed of the sand conveyor screw is selected to provide the desired mixing ratio, for example 1: 1 binder and sand.

The sand hopper can be filled arbitrarily, for example also automatically from the silo using a known fill level detector provided in the hopper. A simpler possibility is provided in claim 9, wherein it is assumed here that a metering belt conveyor of sand is terminated at the inlet opening of the sand hopper. Suitable dosing 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 a gap with adjustable cross-section, it is then possible to adjust the amount of sand withdrawn 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 conveyor connectable to the sand hopper. According to claim 10, the sand hopper has a vertical central axis and is provided with a rotatable bracket about the central axis for the transfer end of the metering belt conveyor, and the sand conveyor drive motor is also mounted on the bracket. The holder can thus be placed in a position corresponding to the local conditions in which the metering belt conveyor is.

E £ Picture_in_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.

FIG. 1 is a partial cross-sectional side view of the device designed for dry mortar filling; FIG. 2 shows a mixing part for the apparatus of FIG. 1, suitable for the production of plaster spraying mortar or masonry. FIG. 3 shows a mixing portion for the continuous coating apparatus of FIG.

FIG. 4 is a side view corresponding to FIG. 1 but of a further modified device which can also be filled with optional binder and sand.

The_execution_example

In the device according to FIG. 1, the funnel outlet 1 of a dry mortar silos (not shown) is connected via a flexible connection pipe 2, for example a short hose section or a flexible bellows, to an opening in the lid 3a of the filling hopper 3. the mixing device 4 has a mixing part 5 as shown in FIG. 2, but can also optionally be replaced by a mixing part 9 as shown in FIG. 3. The mixing part 5 is driven by a schematically indicated electric motor (3 with connected gear) 6a with a constant speed of several hundred revolutions per minute A screw pump 7 is connected to the outlet side of the screw mixer 4 by means of a flange, which has a known construction, whose conveying screw is non-rotatably connected to the mixing part 5. direction pipe or snake pipe S which leads to the place of use s

the screw agitator 4 and the screw pump 7 are arranged coaxially one after another in an axis descending in the conveying direction, which forms an angle α of 10 ° to 30 ° with the horizontal plane.

The device as a whole is mounted only on the symbolically indicated bogie 10. For transport, the flexible connecting tube 2 is released either from the silo outlet 1 or from the filling hopper 3.

In order to prevent dry mortar from falling directly out of the silo into the auger mixer 4, which could cause operational malfunctions, the filling hopper 3 has an inclined wall 3b which acts as a chute. This inclined wall 3b, which is arranged transversely to the conveying direction and adjoins the electric motor 6, forms an angle with the vertical of, for example, 30 ° to 50 °. The filling opening in the lid 3a of the filling 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 down into the auger mixer 4. There it is first conveyed in the direction of the water connection 11 symbolically indicated the water supply and then mixed with water, and partly due to the mixing part 5 and partly due to the force of gravity is fed to the screw pump 7. During this time, water from the dosing device 13 is continuously supplied in prescribed doses via the water connection 11 and the symbolically shown pipe 112. The dispensing device 13, which may be of any construction, is connected to the local water supply network by means of a solenoid valve 14, which can be simultaneously designed as a pressure relief valve.

In addition to the metering device 13, an electrical cabinet 15 is shown symbolically, which controls the entire device, in particular depending on the output signal on or in the charging hopper 3 in a suitable location of the arranged level indicator. This ensures 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 in the silo provided above or opening the slider at the silo outlet if the specified filling level is not reached. These details, which are known per se and are not part of the invention, are not shown.

Despite the simple construction, the plaster or lining mortar as shown in FIG. 1 can be produced as well as a continuous coating. This is achieved by using specially designed mixing parts 5, j) adapted to the corresponding material, which can be easily exchanged together with the replacement of the worm pump 7, which is necessary in each case, since this must be considerably more efficient than in the production of a continuous coating, since it has a substantially more fluid consistency. For easy replaceability of the mixing part 5, 9, the drive assembly, consisting of the electric motor 6 and the transmission 6a, is connected to the housing of the worm agitator 4 so that it can be folded out (not shown). Furthermore, the mixing part 5, j) is connected to the drive unit shaft and to the drive side of the screw conveyor auger 7 in a force-tight manner by means of the clamping teeth 41. 42.

The mixing part 5 shown in FIGS. 1 and 2 is used for the production of plaster mortar or masonry mortar. According to FIG. 2, the mixing section 5 has a first section 51 of a through-worm 50 having about three and a half turns, as well as a second section 52 having approximately the same length is formed of worm segments 53 and has greater climb. By means of the relatively large pitch of the screw segments 53 of the second section 52, a particularly good mixing effect is achieved. Preferably, the periodic gaps 54 prevent this large incline from causing a correspondingly high conveying speed in the axial direction. In fact, a high conveying speed would result in the mixing time being shortened too much and it would not be possible to achieve a homogeneous mixing. 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 serves to produce a continuous coating. It also contains two functionally different sections. The first section 91 has individual, flat mixing vanes 90 that are aligned with the radial plane by an angle corresponding to the direction of transport as well as from right to left in FIG. 2 and to the desired conveying speed.

This is followed by a second section 92 which corresponds to a 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. bridges 95 which are uniformly distributed around the circumference of the mixing part 1) 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. 90, 93 are formed according to the relatively fluid consistency of the continuous coating and thus prevent the formation of high pressure at the inlet of the screw pump 7 in FIG. 1.

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

FIG. 4 shows a further preferred embodiment of the apparatus of FIG. 1. This further preferred apparatus serves for the production of pumpable mortar materials from binder and sand, in particular for the production of a continuous coating. Therefore, the screw mixer 4 is equipped here with a mixing part 9 according to FIG. All other parts of the apparatus already shown in FIG. 1 are provided with the same reference numerals. However, while the apparatus of FIG. 1 is filled by means of its filling hopper 3 with a premixed dry ready-to-use mortar, the apparatus of FIG. 4 is primarily intended for producing pumpable mortar on the construction site, in particular a continuous binder paint. of sand. The binder enters from a silo arranged above the funnel outlet JL. The sand comes from the construction site and is added via the sand hopper 20, whose tubing neck 20a of the hopper opens above the sand pouring hole 4a in the housing of the auger mixer 4. The sand pouring hole 4a is provided downstream of the water connection 11.

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

Of course, the improved device of FIG. 4 can also be filled with ready-to-use, premixed dry mortar. They are then not functional in the previously described sand supply components. The sand hopper 20 can either remain in place or can be released from the extension 21 and then closed with the corresponding lid.

Claims (10)

A plant for the production of pumpable mortar materials at a construction site, comprising a auger mixer in which dry material is continuously fed through the feed hopper and a connection provided downstream of the feed hopper, a metered amount of water, and a screw pump connected downstream of the screw a mixing device, characterized in that, on the one hand, the screw mixing device (4) and the screw pump (7) are arranged coaxially one after the other along an axially arranged axis which forms an angle (c <) of 10 ° to 30 ° with the horizontal , 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 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 essentially for conveying as dry mortar the added mortar material to the water connection (11) and dr the section (52; 92) is configured to mix dry mortar with water. Device according to claim 1, characterized in that the mixing part (5, 9) of the worm agitator (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 worm mixer housing (4) in a hinged or quick-release manner. Apparatus according to claim 1 or 2, characterized in that the wall (3b) of the feed hopper (3) adjoining the drive unit (6, 6a) substantially inclined transversely to the conveying direction is inclined relative to the vertical plane. at an angle (β) of 30 ° to 40 ° for the upward extension of the feed hopper (3), and the feed hopper (3) has a feed opening whose projection surface falls on this inclined wall (3b). Device according to one of Claims 1 to 3 for the production of methane plastering, characterized in that the first section (51) of the mixing part (5) consists of a through-worm (50) with two to four turns and a second section (52) of periodically an intermittent worm of approximately the same length but with a larger pitch with two to three turns as well as an axial bridge (55) which connects the corresponding circumferential regions of the axially successive worm segments (53) to form a wall wiper. Device according to one of Claims 1 to 3, for producing a continuous coating, characterized in that the first section (91) of the mixing part (9) consists of individual flat mixing blades (90) which are adjusted relative to the radial plane at an angle adapted to the angle and the second section (92) consists of similar mixing vanes (93), two adjacent mixing vanes (93) arranged in the same axial plane to form pairs whose peripheral regions are connected by axial bridges (95). and at least two of said webs (95) are arranged offset by 180 ° in the circumferential direction and preferably by the length of the web (95) in the axial direction. Device according to claim 1 and / or one of claims 2 to 5, characterized in that, on the one hand, the screw agitator (4) and the screw pump (7) are arranged coaxially one after the other around the axis provided in the transport direction. which forms an angle (C <) of 10 ° to 30 ° with the horizontal plane, 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) worm agitator (4) two sections (51, 52; 91, 92), of which the first section (51; 91) is formed essentially for conveying the dry material added as a binder to the water connection (11) and the second section (52; 92) is designed to mix the binder with water, and secondly has a screw mixing device (4) at the height of the second section ( 52; 92) of its mixing portion (5; 9) in its tubular jacket at the top is a hole (4a) for pouring sand. Device according to claim 6, characterized in that a sand hopper (20) is emptied into the sand filling opening (4a). Apparatus according to claim 7, characterized in that the sand hopper (20) has a hopper throat (20a) in which a sand conveyor screw (26) driven by a driving motor (25) provided above the sand hopper (20) is provided. Apparatus according to claim 7 or 8, characterized in that a 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 with a rotatable bracket (24) about the central axis for the transfer end of the metering belt conveyor (22), and on the bracket (24) a driving motor (25) of the sand conveyor screw (26) is also mounted. OF