Mill (design and grinding method)

FIELD: food industry.

SUBSTANCE: device relates to the field of producing fine powders including nano-sized ones. The device contains a hollow perforated cone-shaped electric motor rotor wherein, the same as in the grinding bowl of a common mill, proceeds disintegration of a substance to produce a nano-sized powder. On the inside the rotor has teeth or spikes performing disintegration of larger substance globules and creating aggressive vortex flows that continue milling the substance to ever smaller particles. Grinding is additionally promoted by vibration of the rotor suspended on magnet bearings during its high-speed rotation; the magnet bearings proper are designed so that to enable correction of the rotor vertical and horizontal microvibrations in accordance with the preset algorithm. Grinding is performed due to simultaneous action of three factors: disintegrating effect of the rotor spikes, aggressive air or gas vortices, rotor microvibration in the longitudinal or crosswise direction. Grinding proceeds within two spaces simultaneously: inside the hollow rotor and in the space between the rotor and the stator. Thanks too the device design peculiarities grinding is performed into two substance fractions at once.

EFFECT: invention enables production of fine powder with dispersity less than 100 micron.

2 cl, 3 dwg

 

The invention relates to household and industrial engineering and can be used for grinding food (coffee, grain, herbal medicinal and technical raw materials), as well as in industry and, in particular, to obtain powders.

The prior art mills for grinding coffee (RU, patent, 2110943, A47J 42/06, A23F 5/08 from 1998.05.20). Coffee grinder (prototype) includes a housing with a grinding bowl. The working body and impeller are located on the motor shaft. Cover has channels, and the impeller is located below the grinding bowl made of perforated material. The cover is made annular protrusion in the form of the upper half of a circular toroid and the labyrinth seal on the input channels. This eliminates the build-up of ground coffee on the sides and bottom of the grinding bowl.

The disadvantage of this grinder is the inability to get a fine grind, related to particle size of the nanopowders.

A well-known coffee grinder (czernicki I.I., Potapov I. Repair of household appliances and machines at home - M.: Mashinostroenie, 1992, p.14), comprising a housing within which are located the grinding bowl and the motor, in the center of the bowl is a knife mounted on the motor shaft. On top of the bowl is closed by a cover.

The disadvantage of this grinder is the difficulty of removing peramola the CSOs coffee from the Cup due to it sticking to the sides and bottom.

The present invention is the creation of opportunities for relatively simple devices fine powder with particle size less than 100 microns.

This objective is achieved in that the grinding bowl is replaced by a cone-shaped hollow rotor of the electric motor made with the inner edges of the teeth and/or the spokes and through-hole. Means of grinding are the spokes and the rotor vibrating during rotation. The rotor makes a vibrating micro movements that you can adjust the magnetic bearings in a given algorithm. Help factor refining are vortices within the rotor, organized by the boot cylinder, made in the upper part with the inner blade edges and sucking in air together with the material for grinding. Boot cylinder (pipe) can be made long and fall below the average transverse line of the rotor so that incoming through the air (gas) was lifted into suspension material for grinding, located on a narrow bottom of the rotor, and prevented it from sticking to the inner part of the rotor. These vortical flows up small particles of the material located between the outer wall of the rotor and the inner wall of the stator, facilitating the process of grinding in a vortex flow. However long agrozone pipe contributes to the distribution of the inert gas within the rotor and create a more aggressive vortex flow, that improves disintegration properties of vortex effects on the substance.

For producing very fine grind the need arises (as the prevention of explosion and oxidation) to serve in the grinding space of the rotor inert gas (nitrogen, carbon monoxide, etc.). To perform this operation is enough to bring the tube out of the gas close to the outer hole hoppers or boot tube with the blade edges and the gas will be sucked into the tube. When frequently repeated operations of this kind in the lid of the mill it is advisable to arrange the nozzle for gas supply, overlapping the corresponding valve.

For producing nanopowder boot up the rotor perform long (extend, perhaps even almost to the narrow bottom of the rotor), which improves the uniformity of the distribution of inert gas over the entire inner volume of the rotor.

The rotor when the rotation is suspended on magnetic bearings, made with the ability to adjust the micro-vibrations of the rotor (using electromagnetic pulses) in the vertical and horizontal directions. The mill shell mandatory grounded.

In a constructive plan for producing a very fine powder, and especially when his collection in the collection vessels may need to perform excretory openings prefabricated Toboso is with the possibility of sealing them from the external environment relevant materials. The purpose of this design solution in preventing rutlemania very small particles of matter and their targeted pouring into the receiving vessel. As such material may be used synthetic microporous fabric or even ordinary polyethylene on the outer surface of which is coated with a conductive layer, enabling the local ground of this part of the device.

In addition, the valves on the exhaust tube mills can be made with the possibility of automatic adjustment of the Electromechanical device of any type to create an automatic system for control of the mill.

In the short version of the device can be described as follows:

Mill for grinding substances, including the motor and the refining system, characterized in that the rotor of the motor is made conical with the possibility of replacing razmolotoe of the Cup and the inner surface of the hollow and perforated rotor made with spokes; while in the upper part of the rotor is made bootable pipe with the edges of the blades to create a flow of air inward of the rotor, and the lower part is made with a support base and a recess for the ball.

Mill, characterized in that the lower and upper magnetic bearing rotor, to suspend one of his during rotation, ispolneny with the possibility of adjusting the vertical and horizontal microscopic vibrations of the rotor during its rotation in a predetermined algorithm.

There is a method of grinding substances (EN 2110943) using a modified razmolotoe of the Cup and the air flow created by the impeller, mounted on the axis of the engine.

The disadvantage of this method is the inability to obtain powders of less than 100 microns on a massive scale (i.e. in a large percentage of the weight of the milled material).

The present invention is to provide a method that allows to get high (mass) output powder with sizes less than 100 microns.

The problem is solved by the fact that the grinding of lead in specially designed mill, where the factors of implementation grinding are dezintegriruetsja role of the spokes of the rotor vortical flows of air (gas) inside the rotor and micro-vibrations of the rotor. In addition, upon receipt of fine powders in the space for grinding injected inert gas to prevent explosion of the powder and its oxidation.

Raw suck in the grinding bowl (in the inner space of the hollow rotor) through the loading pipe and sent to a rapidly rotating spokes (teeth) of the rotor. The resulting fine particles of material gain aerostatic quality compared to the original raw material and move on to other trajectories, making involved in the vortex grinding.

Features grinding principles are that the process is conducted at odnovremenno the impact of three factors: dezintegriruetsja the impact of the spokes of the rotor, aggressive air (gas) vortices, micro-vibrations of the rotor in the horizontal and vertical directions. In addition, the grinding takes place in two spaces at once: inside the hollow rotor and in the space between the rotor and stator.

The process includes the following operations:

- preparation of raw material for grinding;

- download the raw material through the hopper and the loading tube of the rotor;

- maintenance of grinding for the given algorithms rotation and microscopic vibrations of the rotor at a given vortex mode within the rotor, given the movements of air (gases) through the valves of tubes, bringing the powders in the collection vessels;

- collection of powders under specified traffic conditions air (gases) through the valve outlet tubes.

In brief, the method can be represented as follows:

Method of grinding substances, including its inclusion in the grinding bowl, using air flow to prevent the buildup of powder on the inner surface of the grinding device, characterized in that the grinding substances carry out inside of a hollow and perforated rotor of the electric motor, equipped with the inner sides of the teeth (spokes), the substance itself for grinding draw with a stream of air (gas) inside the rotor, where the factors contributing to the refining, are beats by spokes, microvibrations of the rotor and the whirlwind is haunted streams of air (gas) inside the rotor; the process of grinding is carried out with the possibility of obtaining two fractions of the substance.

The invention is illustrated by drawings 1, 2, 3, where figure 1 shows the device in full Assembly, figure 2 presents the rotor in more detail, and figure 3 presents a fundamentally important elements of the stator. Further description will be with reference to these figures.

Mill 1 (figure 1) includes a housing 2, in which the distributed stator winding 3 and the magnetic bearing 4, and outlet tubes 5 (for powder with nano) and 6 for a more coarse grind. Both tubes are made with flaps that change their position by means of rods 7. In the upper part of the body ends with projections 8 with the screw thread for screwing the cap 9, is made with the second magnetic bearing 10 and the sleeve 11. In the upper part of the cover are slots (not shown) for fastening the nozzle 12 (with protrusions 12', see figure 3), which created space for a feed hopper 13.

The rotor 14 (Fig 1 and 2) are hollow and perforated with a feed channel (tube) 15, the spokes 16 and the support base 17.

Outside the mill shell is decorated with a decorative transparent coating inside which made space for receiving tank 18 (for minor faction grinding) and 19 (for a more coarse grind).

Structurally mouth is p (2) is movable with the upper 20 and lower 21 parts, United threaded connection. In the reference base of the rotor is made a recess 22 in a ball bearing 23 (ball) of the lower magnetic bearing. Boot tube rotor is constructed with blades 24 to create air movement from the top down, that is, inside of the rotor.

Fundamental elements of the stator and its body is presented in figure 3.

Works mill as follows.

When the voltage is switched on, the rotor 14 performs a rotation on the bearing ball 23 at low speed and at high speed of rotation of the rotor is suspended on magnetic bearings 4 and partly on the magnetic bearing 10. The last task is to create the most stable rotation in the sleeve 11 at a high rotational speed of the rotor.

Spokes 16 smash particles of raw material into smaller pieces that more the volume involved in the vortex process, contributing to further melting of the substance, pushed through the perforations of the rotor in the space between the rotor and stator, go up to the tube 5 and go through it in team capacity 18.

Larger particles (when running at low speed rotor) in the greater its volume into the tube 6 and are collected in a container 19.

Before loading the raw material into the rotor 14 mill run at idle and achieve smooth and suspended on magnetic bearings of two who Kah 4 and 10 state of rotation of the rotor with closed valves tubes 5 and 6. Then into the funnel 13 serves prepared by fractional composition dose of raw materials and check the quality parameters of the obtained fractions grinding in tanks 18 and 19. If necessary, the mode of rotation of the rotor to change or correct.

When closed or closed valves in the tubes 5 and 6, the grinding continued and transferred the matter in an increasingly small fraction.

When the exhaust mode (meaning the algorithm) of rotation of the rotor and the amount of raw material per unit of time set position of the valve rod 7 in the tubes 5 and 6 and carry out continuous grinding of the product in a semi-automatic or automatic modes.

1. Mill for grinding substances, including the motor and the refining system, characterized in that the rotor of the motor is made conical with the possibility of replacing razmolotoe bowl and the inner surface of the hollow and perforated rotor made with spokes; while in the upper part of the rotor is made bootable pipe with the edges of the blades to create a flow of air inward of the rotor, and the lower part is made with a support base and a recess for the ball; however, the lower and upper magnetic bearing rotor, to suspend one of his during rotation, is made with the possibility of adjusting the vertical and horizontal microscopic vibrations in the course of its rotation in the acceptable algorithm.

2. Method of grinding substances, including its inclusion in the grinding bowl and the use of air or gas streams to prevent build-up of substances on the internal surface of the grinding device, characterized in that the grinding substances carry out inside of a hollow and perforated rotor of the electric motor, equipped with the inner sides of the teeth or spokes, the substance itself for grinding draw with a stream of air or gases inside of the rotor where the factors contributing to the refining, are beats by spokes, microvibrations of the rotor and vortex flow of air or gas within the rotor; the process of grinding is carried out with the possibility of obtaining two fractions of the substance.



 

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The invention relates to household appliances, in particular to a device for grinding coffee

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