DE2406874C2 - Method and device for mixing goods containing a solid component - Google Patents

Description

20th

35

⁴⁰

The invention relates to a method for mixing goods containing a solid component in a pressure vessel with inlet and outlet closures and pressure nozzles, in which pressure jets of a blowing medium are guided into the material to be mixed in the container. When the detected also by the invention apparatus for performing this method also has the pressure vessel approximately parallel to the container *>=> axis directional blast nozzles for directed into the container interior pressure jets of a blasting medium as well as inlet and outlet closures on.

Such a method can be found in DE-AS 11 58 798 together with a corresponding device with an upright pressure vessel. With this, the overpressure occurring in previously known pressure vessels is to be avoided. To do this is ^; : r. Pressure vessel a separate pressure chamber with an elastic outer wall is provided, which protrudes into the pressure chamber and can be changed elastically to avoid the overpressure. A so-called displacement process is required here, to which the actual Misc! Process follows While a short blast of compressed air is blown into the mix through a compressed air valve and nozzles, the air inlet and outlet valves provided are closed. As a result of the incoming compressed air, the elastic wall is then turned back and the air located above this wall is pushed out. Then the mix has to be calmed down again after the short blast of compressed air, after which it falls through a cone bottom into a discharge line.

The amount of gas that can be sent through the introduced bulk material for mixing is by the volume above the bulk material and the available or from the mixing container tolerable pressure is limited Between the individual mixing impulses there are pauses, which reduce the performance the device considerably. In addition, the air jets in many mixed goods - especially in sticky goods - channels through which the air then without mixing effect with high Speed flows away. In the process, many product parts are carried away - for this reason it is necessary in the method of DE-AS 11 58 798 a settling time and a filter.

The German patent application N4 081IVc / 12e describes a granulate mixer with a vibration motor known.

Vibrating mixers with eccentric drive show good mixing performance, but the conveyance of the Mixing material from the container, which is only open to obea, is only possible by tilting, whereby dust and Spread the steam.

Vibrating mixers with unbalance motors run through a resonance range when they run out, in which the Device executes very wide vibrations that cause voltage peaks. With high performance, i.e. short mixing times, these mixers often pass through the resonance ranges, which increases the risk of fatigue fractures brings with it. If the run-out is limited by brake motors or counter-current braking, the Drive too expensive.

In addition, the vibrating mixers described require mixing room installations to split the mix flows, to swirl them and bring them together.

In various branches of process engineering substances are used that are partly health-related are questionable and represent a pollution and odor nuisance for the environment; these substances can emerge from the mix during mixing and emptying as well as during transport.

The known mixers are mainly emptied in containers and trolleys. To this To prevent it, it has already been proposed to place the mixer on the downstream processing units to be arranged, to which the mix flows via slides or purrs. If you now load several Machines from a mixer by means of slides, so there is still the possibility for the arrangement of the machines

tightly limited

For all of the modes of transport shown, economic and technological aspects do not determine the machine arrangement, but the conditions of the transport routes.

Pneumatic conveying may offer a solution here, in whose pressure vessel the Mixture is introduced from the mixer; it can be vertical as well as inclined or horizontal Routes are served. The disadvantage of these systems, however, is that sticky mix materials do not look good flow out of the pressure vessel into the delivery line and partly already at the chute between mixer and Pressure vessels get stuck.

In view of these circumstances, the inventor has set himself the goal of eliminating the disadvantages indicated known mixers and mixing systems to fix, on the one hand the heavy wear and tear, the inadequate sealing parts moving against each other, the escape of dust and fumes during emptying and transport as well as to prevent time-consuming cleaning on the mixer itself, and on the other hand that results from the to reduce subsequent transport resulting difficulties, for example the inflexible construction, the unfavorable transitions from the pressure vessel to the delivery line, the separation of the mixing and transport device A remedy should also be brought about by a structurally simple device that is inexpensive to operate and maintain.

To solve this problem, a method according to the characterizing part of claim 1 leads to it Implementation according to the invention a device according to claim 5 can be used advantageously can.

The material brought into the pressure vessel is vibrated and introduced into this moving material Blown air mixed, which penetrates approximately parallel to the main axis of the container, both during as also after the mixing process: this blown air builds up an overpressure in the container. with the help of which mixed material is pushed out of the mixing container into the subsequent conveying line.

According to another feature of the invention, with or instead of the blown air, gas or a liquid in the mix can be injected: these blowing media can either be used exclusively to support the 4ί Mixing and conveying serve or at least partially represent a substance component to be introduced. In both cases, the rising and possibly radially penetrating rays point in the mix Channels on. soft thanks to the overlaying> <> Vibration movements collapse again shortly after they arise and so the mixing process support financially.

In the device according to the invention, the pressure medium flows from a plurality of distributed blow nozzles "> in the container roughness and receives so - against known mixers - the discharge line for the mix is functional over its entire cross-section. However, this is the prerequisite for the possibility of the mixture being blown in by the bo to let the resulting pressure eject.

It has proven to be particularly favorable that the new mixing and conveying device is a fully automatic one Classify link in a delivery line, for example as a self-controlled pressure vessel with air nozzles t> 5 - According to another feature of the invention - by a signal device to be triggered in the event of a pressure drop in the container be shut down

In contrast to the prior art, the outflow of the material to be mixed is achieved by creating a pressure in the The pressure tank is supported, which means that the mix can flow out while the vibration motor is running allowed. The air supplied is further mixed with the mix and keeps it flowing.

In contrast to the subject of DE-AS 11 58 798 Finally, in the method according to the invention, the mixed gas flows through upper outlets in the mixed phase without taking away significant amounts of material. This is only possible because the introduced air is slowed down in the mix which is in motion due to vibrations, itself intimately mixed with this and emerges on its surface at a relatively low speed.

For the person skilled in the art it is surprising that in the case of very fine powder - even in the case of sticky products - high Mixing effects can be achieved with a very simple device.

The invention is described in more detail below with reference to a preferred exemplary embodiment, which is shown schematically in the drawing in the single figure in sectional elevation

A cylindrical pressure or mixing container R with a vertical main axis V closes off at the top in a hood-like cover 2, which is firmly connected to the mixing container R in the area of flanges 4 and can be removed for cleaning purposes, for example. Mounted on the support 5 made of elastic material surrounds a central recess of the lid 2 G and connects the latter with a pinch valve as an inlet closure 7E Above this is a closable filling hopper 8 for the introduction of material to be mixed Cangedeutet and a blow pipe. 9

The one-piece with the container 10 container base 11 also has a central opening 14 followed by on the container outer side pinch valve as the outlet closure 7 * Both this and the inlet shutter 7 _C will be selected depending on the components to be mixed. Instead of the pinch valves, flaps, cone locks, slides or similar organs can also be used.

Below the outlet closure I ₃ there is an air inlet 15 for the radial introduction of metering air Q. An elastic intermediate pipe 16 is connected to the air inlet 15 in the axial direction, the other end of which opens into a - not recognizable - delivery line.

Nozzles 18 which can be acted upon are seated on the container bottom 11 via a feed line 17. Further spray elements 19 are provided in the container wall 10 at approximately half the container height h.

On the side of the pressure or mixing container R , unbalance drives 51 can be seen on a collar 50, as well as several springs 53 between that collar 50 and a stand frame 54, by means of which the mixing container R is mounted on the stand frame 54. The actuators 51 are turned 7 _e closed lower AuslaufveiSchluß T ₁ and open the inlet closure. Subsequently, the material to be mixed C is filled into the mixing container R via the funnel 8.

If the mixing container is filled with a batch Ci, it is the hopper 8 is automatically closed. Now the nozzles 18 and their medium jets open cut the batch G set in vibration by the drives 51 approximately perpendicular to an imaginary plane of rotation. In the drawing, nozzles are 18 in Inclined position recognizable, the rays of which are approximately in

half container height /; cut. These rays cause a strong turbulence in the pile C \. In addition, media jets can also be generated by the peripheral nozzles 19.

The inflowing air - or another flow medium - builds up pressure in the closed mixing container R. which presses the mixed material G after opening the lower outlet closure 7, via the intermediate pipe 16 into the conveying line. By controlling the air volume Q at the air inlet 15, on the one hand the material load of the conveyance is determined, and on the other hand any plug formation is prevented.

After the mixed material G has been conveyed away - favored by the vibrations of the mixing container R - the pressure in the mixing container R drops. This pressure drop triggers a signal. that throttles the supply in the supply lines 15, 17, closes the lower outlet closure 7, and opens the inlet closure 7,.

The amount of air, gas or liquid H introduced can, depending on the circumstances of the mixing and conveying process, be partially or entirely diverted, filtered and neutralized through the upper exhaust pipe 9 and, if necessary, re-fed to a compressor in a closed circuit.

Further advantages when considering the exemplary embodiment are, on the one hand, the simple structure the device consists essentially of commercially available parts and, on the other hand, those without difficulty feasible automation recognizable.

1 sheet of drawings

Claims (9)

Patent claims: 1. A method for mixing goods containing a solid component in a pressure vessel with inlet and outlet closure and pressure nozzles, in the pressure jetting of a blowing medium in the mix located in the container are guided, characterized in that the Mixture set in vibration with the pressure vessel and destroying the approximately parallel to the container axis running pressure jets generated channels mixed and a delivery pressure for the following pneumatic conveyance of the mixed material is set up. 2. The method according to claim 1 with air as the blowing medium, characterized in that with or instead of the blowing air (U) gas or a liquid is injected into the mix. 3. The method according to claim 1 or 2, characterized in that in the stream of the At least one air flow is introduced into the pressure vessel under delivery pressure will. 4. The method according to claim 3, characterized in that the supply of the air flow at Pressure drop in the pressure vessel is interrupted. 5. Device for treating mixed material for performing the method according to one of claims 1 to 4 with a pressure vessel which has blowing nozzles directed approximately parallel to the container axis for pressure jets of a blowing medium and inlet and outlet closures directed into the container interior, characterized in that the pressure vessel (Jl) can be swung and a pneumatic conveying line (16) can be connected to the outlet closure (7,). 6. Device with blow nozzles for blown air according to claim 5, characterized in that further blow nozzles (18, 19) are arranged for a mixed component in the pressure vessel (R). 7. Apparatus according to claim 5 or 6, characterized by an air supply line (15) at the outlet of the outlet closure (7,) for metering the mix load (Ci) in the extracting stream. 8. Device according to one of claims 5 to 7, characterized in that the blow nozzles (18, 19) and / or the air supply line (15) by a signaling device that can be triggered in the event of a pressure drop inside the container are designed to be shut down. 9. Device according to one of claims 5 to 8, characterized in that outside the inlet closure (7,) an adjoining blow-out pipe (9) or the like is provided for the media. ok