DE2108181C3 - Device for processing, mixing, loosening, dividing or cooling of granular material, in particular casting sand - Google Patents

Description

The present invention relates to an apparatus for processing granular material, in particular Cießsand. with a receiving the granular material. Containers containing stirring and mixing tools.

Devices are already known which consist of a combination of mixing devices. Loosening devices and cooling devices exist. These mixing devices have, for example, containers / for taking up the material to be mixed, in which rotating agitators can be arranged. The loosening devices or the so-called aerators. are often provided with a sand sluice, to both loosen and * u cool the granular material. To cool the granular mix too accelerate, blowers often get into cooling devices to use.

Is disadvantageous. that the individual devices for the preparation of granular material by conveyor devices are related to each other, from what once a relatively large design effort for the combination of the individual devices and for others a great plea must result.

The I ROS 20 03 03b is an already improved one Relevant device is known in which the granular material is vcrsclzbarcn in a torsional vibration Container is entered and after treatment is discharged with stirring. The disadvantage is that no guarantee that all tubers are laic Have been crushed so that weak spots in the Casting mold can occur, a possibly natural ZCfkleihertmgswälzc, which in a Exemplary embodiment is shown, can still shred existing tubers, but then one is missing Wrapping with a binding agent. Another disadvantage is that when wet

^ Lumps of sand, if bridging can occur, the impellers run idle, so that energy is lost. Air is injected for further transport, what Energy costs. An asserted mixing and kneading effect, which includes all individual grains, is not guaranteed, at least not in a short time. Deflection plates are also required to remove the sand that is thrown up capture. The air cooling is not optimal, as it can escape through holes in the wall.

It is the object of the present invention to this

^ To avoid disadvantages, to make the processing of the granular material more effective, safer and easier by means of a single, compact device and to reduce operating and construction costs.

The task is carried out by the

- ° Claim 1 specified features solved. Advanced training go out from the IIniernnsnriichen.

When processing foundry California and Core sands, ceramic masses and similar materials, each stage of the preparation cycle is of the greatest importance Meaning in which the mixture, which usually consists of grains of different sizes, is homogenized and very often with powdery liquid or pasty binders and additives or one Combination of these substances must be mixed.

for example, in the case of foundry sands, too an even coating of the grains with the in ofi very small amounts of added binder must be achieved in the shortest possible time. For this are kneading and Frictional effects within the grain mixture itself required, that is, the treatment energy supplied must be as completely as possible in the mix are transmitted by themselves. The resulting movement and friction of grain against grain, the is called the dynamics of the whole "of the surfaces of the Incidentally, the grains result in the actual homogenization and wrapping.

Because the material is thrown through a gap, the complete comminution is the Sand lumps, even from dry pomaceous stones, guaranteed

⁴ ^ performs. This can be done in the shortest possible time, because no safety measures have to be taken into account with the continuous treatment. At the same time and without additional energy expenditure, the relative rotation of the two riehaller automatically creates the

Ό required knee and mixed effects generated that all the grains in turn evenly covered with added bandage and other means Fs none works 1 Energy lost, debris can be caused by the Vibrations of the mixing tools are avoided

v> Optionally come a blower / for application by its l.iiflsclmhi all grains hindurchgezwängl be isolated simplistic. The treated grains fall loosely on e.g. 15. an Iransporlmillcl (I licUhaiul). so that there is no need for a compressed air supply. Insulating the gap can reduce the degree of cracking. It is also advantageous if only the small bowl-shaped container stall of the larger, upper container is set in rotation or vibration. The vibration device can, if necessary, remain out of operation.

The drawing shows several embodiments of the invention in a simplified manner, and

21 08 1

though

F i g. I a .Schnitt through a first embodiment a device / for the preparation of granular material.

Fig. 2 a section through a / wide version! »-"> beispicl, which two devices of the F i g. 1 ge /. inclined embodiment, of which one device is arranged above the other,

F i g. 3 shows a section through a third exemplary embodiment a processing device, which two in ic has opposite direction of rotation, separated by a ring gap container, in which conveyors are arranged.

4 shows the arrangement and design of a rotating in the horizontal direction in oscillation displaceable stirring and mixing tool, which is arranged in a container of the processing device is,

5 shows the arrangement and design of a rotating and vibrating in the vertical direction relocatable stirring and mixing tool, which also in a container in the preparation container is arranged.

According to the first exemplary embodiment shown in FIG. I, a tubular container 1 of the processing device is connected to a frame 2 iest. Above the upper opening 3 of the container 1 is a Fördenorrichtung 4 is arranged, with which the on / ubereiiende granular material or the casting 5 rcisand the Keep 1 is fed through the opening. 3 The container 1 is preferably designed to widen downward, as a result of which a better slide like the granular material located in the container 1 is achieved from top to bottom. With the frame 2 in a manner not shown a drive device and for stirring and mixing works 2cugc 7 is connected which can be rotated and simultaneously in the vertical and / or horizontal direction in vibration, as this also in Figs. I and 5 is shown. The agitating and mixing tools 7 can, as already known, be designed in various ways according to the operational requirements. For example, rod-shaped or rake-shaped as well as spiral-shaped mixing and stirring tools can be used. Coaxially opposite the lower opening 8 of the stationary container I is a bowl-shaped container 10 which can be set in rotation and vibrates and has an upper opening 9, the side wall 11 of which is separated from the opposite side wall 13 of the container 1 by an annular gap 12. The container 10 is in drive connection with a motor 14 and is mounted on a shaft 15 such that it can oscillate. The mounting of the shaft 15 can optionally be designed so that the container 10 can oscillate in the horizontal and / or vertical direction with respect to the container 1, as shown in FIG. 1 is shown by the dash-dotted line. The position of the container 10 and of the motor 14 bo , which is in drive connection with it, can be adjusted in the vertical direction with the aid of fastening elements 16, for example screw bolts with nuts, guided in elongated holes 34 of the frame 2, in order to set a desired width of the annular gap 12 to be changed. The frame 2 has in the lower part a cylindrical wall 17i against which granular material is thrown through the annular gap 12 in the direction of the arrows 18 and falls by its own heavy claw into an unspecified silo. The cylindrical wall 17 is provided with an annular cover 19. Between the inner edge 20 of the cover 19 and the outer wall of the container I is an annular gap 21 through which air can be blown in the direction of the arrows 24 via an annular chamber 22 with the aid of a fan 23 to cool the granular material.

According to the operating mode for continuous processing, the foundry sand is initially mi; the Conveying device 4 supplied to the stationary container 1, this being on the bowl-shaped Container 10 falls and accumulates in container 1. After reaching a predetermined degree of filling of the container 1, the mixing process is carried out by activating the stirring and mixing tools 7 initiated and then the bowl-shaped container 10 in a relatively hochlourige. eccentric swinging and / or rotational movement in relation to the vertical axis \ .ersc.zt. This will the grain mixture 5 through the width-adjustable annular gap 12 to the outside against the cylindrical wall 17 thrown and at the same time in the witched Way divided into individual particles. The wall 17 can preferably made of elastic wrapping material (Plastic, etc.) exist

In the case of the FIG. 1 shown U-shaped Cross section of the rotating and swinging shot self-shaped container 10 is achieved that in the lower Part of the tubular container 1. in which a Centrifugal movement of the grain mixture 5 and its promotion to the outside are initiated, a friction is generated from grain mixture to grain mixture. This results in the targeted movement training achieved in the grain mixture itself, so that grain rubs against grain, and added binders and additives are opened up and wrapped evenly around the individual grains. During the rubbing out of that coming from the foundry plant, proportionally At a high temperature grain mixture, there is an exchange of heat with the one surrounding the grains cooler air and thus a cooling of the grain mixture. To increase the cooling effect, the fan 23 can be switched on, with which air in the direction the arrows 24 through the veil 33 of the grain mixture ejected from the annular gap 12 is blown through.

Are there any additives or binders that could affect the mere surface tension or a more or less great cohesion due to the actual clamping effect result in the prepared mass, this may be not look lumpy, but should be for them further processing as loosely as possible and evenly in the individual grains be divided. These requirements are met in one operation by the device according to the invention achieved.

Further examples are described below:

The in the F ι g. The second exemplary embodiment shown in FIG. 2 represents a processing device in Which two devices of the first embodiment are arranged one above the other. As a result, in the Essentially the Homogenisier ', Misch- und Schleudervöfgartg repeated and thus optimized.

In the embodiment shown in FIG will two streams of grain mix,

preferably in the horizontal direction, in two tubular ones Containers 24, 25 with the help of conveying devices 26, 27, for example screw conveyors, not in detail piston shown. Membranes or compressed air, conveyed towards one another. The bcidtn tubular Containers 24, 25 abut against one another and move apart from a narrow, adjustable gap 12 swinging eccentrically and / or rotating opposite to each other. See also the one by the arrows 28 and 29, the direction of rotation of the container 24, 25 and the direction of oscillation of the container designating Dash-dotted lines 30. This movement process in turn causes a Sehleudcr-Rcib that generates the Aufberciuihgsgui in itself lets rub and at the same time promotes and divides it to the outside.

The two tubular containers 24, 25 can in a manner not shown in detail instead of axially be arranged at an angle to each other. Thereby an annular one between the ends of the container Gap 12 remains, which is of different widths on its circumference. This arrangement of the Container 24.25 can use gravity to convey material and Rcibtingsdruckerzcugun, 3; be exploited. The width of the annular gap 12 located between the two tubular containers 24, 25 can be set in the desired manner analogously to the first exemplary embodiment shown in FIG will. For cooling and ventilation of the granular material is also analogous to that in the The first embodiment shown in FIG. 1 shows a fan 23 is provided, with which air through the annular chamber 31 through the annular channel 21 in the direction of arrows 32 through the veil 33 of the from the annular gap 12 thrown sand is liindurcheiiet.

From Figure 4 is a computationally-shaped stirring and mixing tool is seen 7, wu rotatably supported on the τ drive motor 6 and in a horizontal direction on a non-swingable nnlier dargestellteil HE? NTCR \ is disposed in a tubular Uchiitfer.

Fig. 5 shows a slabföriiiiges stirring and

in the mixing tool, which is attached to the drive motor 6 rotatable and swingable in the vertical direction - for example with the help of one of the motor (4 driven camshaft - is mounted.

In this context it is particularly important to that the mounting of the agitator and mixer / euge 7 on the motor 6 can also be designed in such a way that the stirring and mixing tool 7 during rotation both in the horizontal and in the vertical direction swings.

Other modifications are also within the meaning of the invention possible. Hs can, for example, also apply to individual devices, such as the fan 23 for cooling the granular material and on the stirring and mixing tools 7 can be waived if these, the cooling and mixing effect enhancing devices due to insufficient accumulation of the granular material than should prove superfluous.

The device is also advantageously suitable for the preparation of sauces of different combinations

Such as the so-called CoId-Box- and Hol-Box-Sandc as well as from Sunden with chemically hardening binder especially synthetic resin. Water glass. Cement and related binders.

For this purpose 4 sheets of drawings

Claims (5)

Patent claims: 1. Device for processing. Mix, Aiiflokkern. Parting or cooling of granular material, especially casting sand, with one the granular Absorbing material. Stirring and mixing tools Containing container, characterized in that that the container (1, 24) is coaxially assigned a further container (10, 25) and their facing openings (8, 9) delimit an annular gap (12), the Container (1,24,10,25) in rotation relative to one another and at least one of the containers can be made to vibrate. 2. Apparatus according to claim I, characterized in that the annular gap (12) Opening (21) of a fan (23) is directed. 3. Apparatus according to claim 1 or 2, characterized in that the container (1) is tubular. Preferred * is conical, the container (10) bowl-shaped is trained. 4. Device according to one or more of claims 1 to 3, characterized in that with the frame (2) a drive device (6) for the stirring and mixing tools (7), which rotate and are simultaneously displaceable in the vertical and / or horizontal direction in vibrations, connected is. 5. Apparatus according to claim I or 2, characterized in that both containers (24, 25) are tubular are formed and each container contains a conveyor device (26 or 27) which Material / around annular gap (12) .ordered.