CN1138587C

CN1138587C - Mixer for cohesive powder materials

Info

Publication number: CN1138587C
Application number: CNB988031442A
Authority: CN
Inventors: 盖尔・诺达尔; 盖尔·诺达尔
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-06
Filing date: 1998-03-06
Publication date: 2004-02-18
Anticipated expiration: 2018-03-06
Also published as: AU6424998A; TR199902176T2; CN1249699A; WO1998039087A1; NO971044L; CA2283478A1; BR9808297A; JP2001513700A; NO971044D0; NO306242B1; ID24467A; PL335511A1; EP1024889A1

Abstract

The present invention relates to a method for a mixer for especially cohesive powder materials by rubbing the cohesive materials against the mixer's wall (6, 8) with at least one rubbing vane on each rotor so that the shearing forces are applied to the material during the rubbing process between the rubbing vanes and the wall (6, 8). The mixer comprises two rotors with several vanes (3) spaced along the rotor with at least one rubbing vane (1, 4, 5, 7) provided on each rotor in addition to the mixer's mixing vanes (3), and the rubbing vanes are arranged such that the materials are rubbed between the rubbing vanes and the wall (6, 8) in the mixer's housing.

Description

The blender that is used for cohesive powder materials

The present invention relates to a kind of method and a kind of blender that is used for the mixing cohesive powders material.

In multiple industrial circle, all include in one way in a lot of industrial process or process that another kind of mode will be mixed mutually as the different materials of raw material or intermediate products.To the very complicated method that more requirements are arranged in equipment and cyclic process, the complexity of so industrial mixed process mixed method alters a great deal from the very simple method that realizes the ideal uniform degree the mixture with simple mechanism.

Mixed method generally can be divided into two classes, i.e. liquid, gas, the solid mixing in liquid, or their combination, and microparticle material is powder under the drying regime or the mixing with powder of the humidity that is lower than its saturation state boundary.In the mixing of dusty material, and can be by diffusion or Brownian movement and to produce mobile fluid opposite, particulate can not produce mobile under the situation that does not have the external force effect.In mixed process, powder produces significantly at aspects such as the physical property of particulate such as size dimension, density, form, surface conditions and changes.And the size dimension of the single particle in the agglomerates is than the high several magnitude of size of the particle in the fluid.

Because the above is difference unknown or that do not cause the characteristic of abundant attention as yet in selecting mixing apparatus and mixing circulation, makes a lot of problems to have occurred in various types of mixed processes.Therefore and the problem that occurs for example utilizes design to be used for that the equipment of mixing material or dried powder material mixes the material of other class and the failure that causes.Unsuitable mixed process can be brought great loss to the user, and loss shows and raw-material unnecessary high consumption produces a large amount of substandard products, the problem in the production of finished product subsequently, the failure that the consumer is dissatisfied and market is captured etc.In containing the identical mixture of one or more cohesive powders, need the velocity gradient that rises to the variation of peripheral speed from above freezing, simultaneously, the shearing force in the small plane is greater than slippage power (slip force).

Slippage power is that single particle will break away from the power that particle cluster or particle heap or particle piece institute must have, and particle cluster or particle are piled or the particle piece be the aggregation of single particle as one in conjunction with particle, so that it can work separately.Slippage power makes whole surface and is not only a little side all is available for the final goal of mixture, and it can be the dyeing of pigment.In order to understand better, suppose that pigment particles is the big ball on a football field, but the football field seems to be still green.If ball is divided into the big particle of 2 μ m with red color, then whole football field seems to be exactly red.

The applicant finds in test, and pigment as a particle agglomeration, is for example comprised ten particles that 2 μ m are big, and then the effect on the color often is that only half is red, because one of pigment particles is positioned at above another, rather than adjacent one another are.

We understand that for the mixed process of pigment, its method is the aggregation of particle should be converted into single particle.For example, in the asphalt product, the stone material must be the single stone of its minimum, so that and obtain desirable activity between the emulsion.Here importantly specific surface is because the efficient of activity relates to the area that is exposed to the available surface under the reaction.Usually filler (filler) is the aggregation of 1mm, if obviously the size of particle is about 10 μ m, then final products are diverse.Viscous particle is because the interior change of some power is tended to the form appearance with the aggregation of single particle, because agglomerate can not decompose caking greatly inadequately.

For medicine, adopt the quantity of packing material of the present invention to be lowered, because the solution that needs is less.Material is broken down in the single particle so that can produce littler tablet, and it is safer easier that tablet is swallowed.

In general, the mixing of the mixing of powder, particularly dried powder is more difficult than the mixing of liquids and gases.Utilize structure of the prior art, elapsed time, product and cost often are impossible reach theoretic optimum state.Can the suitable device that selection can realize several work obtain good economic benefit to the user of mixer apparatus is vital.On the other hand, have a lot of equipment at first sight seemingly identical, but consider a lot of problems that occur in mixed process, they but are number of different types.

The mixing of solid is by the realization that is used for of diffusion, convection current or shearing force.A lot of method and apparatus all are the combinations based on a kind of mechanism, above-mentioned these mechanism.

The physical property of dusty material alters a great deal along with the difference of particle size.If a kind of powder has the particle of the average-size of about 100 μ m, normally a kind of free-pouring material of then this powdered rubber, and the tendency that does not bond together with slide angle of qualification.This material can not obtain internal bond strength under the effect of ambient pressure, can not bear bigger pressure effect and not crushed yet.Obtain the abundant mixing of such material, should take to spread or the mode of convection current.

On the other hand, if the size of particle is less, promptly the major part of particle is basically less than 100 μ m, and then powdered rubber will become a kind of stickum from a kind of free-pouring material.It will obtain one uncertain but very big, also may be bear slide angle, and under the effect of extraneous power, this material also will obtain relatively large adhesion.The variation of physical property shows that also powder has stronger ability and forms aggregation, just big powder mass can occur, and each all has a lot of little particles.The reason of material performance variation is when the size of particle reduces, the leading role power during interparticle active force will powder, and the function of this power is that particle is together with each other.Interparticle active force can be a model ylid bloom action power, electrostatic force, chemistry, magnetic or capillary force.This means with these power mutually the influence of force of gravity effect be very little.Therefore, the effect of gravity can not be resolved into single particle with powder, is that to obtain meticulous mixture necessary and resolve into single particle.So, must apply the effect of shearing force in the mode of friction or high power capacity to powder or aggregation.

High power capacity, for example the utilization of the energy that is obtained by the fast rotational cutter is known, and has been widely used.It is a kind of efficient and simple method, if but cutter is easy to be out of shape or not competent more coarse working environment, then can damage relevant material.And, also there is other problem, the pollution that brings as the wearing and tearing of rotating knife tool variations to powder.If powder is a viscosity, to be easy to be to stick powder on the instrument soon to the result so, and it can not be played a role effectively.

The present invention makes to provide does not have the powder of above-mentioned shortcoming shearing force to become possibility.This is realized by method of the present invention and mixing arrangement.

According to the present invention, a kind of a kind of method that is applicable to the blender of cohesive powder materials that is used for is provided, it is characterized in that being positioned at each epitrochanterian friction pulley frictional adhesion material on the wall of blender, so that make cohesive material be subjected to the effect of shearing force in the process that rubs between friction pulley and the wall with at least one.

The present invention also provides a kind of blender that is used for the mixing cohesive powders material, comprise rotor with a plurality of stirring wheels, these stirring wheels are positioned at a space along rotor, it is characterized in that except the stirring wheel of blender, at least one friction pulley also is provided on each rotor, and wherein the layout of friction pulley makes cohesive material be rubbed between friction pulley and wall in mixer case.

Blender of the present invention can also have following feature or its combination: on rotor, a plurality of friction pulleys are installed between the stirring wheel of rotor, wherein friction pulley is shaped as the bar that extends radially outward, surface with the circle that contacts with particle, and the outer end of friction pulley is bent to definite degree at least, make particle on each side of each friction pulley and its periphery, being rubbed on the friction pulley,, particle is mixed mutually so that provide the shearing force that aggregation is smashed by them.

Friction pulley is the disk of radially arranging, this disk has circular edge, is ellipse or analogous shape on the axial direction.

Friction pulley is the pipe of outer end bending radially.

Each rotor has a friction pulley at each end, is used for frictional adhesion material on the end wall of blender.

The present invention compared with prior art has lot of advantages.Because the meticulous distribution in small plane, separating property has been improved significantly.Mixed process can be carried out careful arrangement, so that use the deleterious material of minute quantity, hybird environment is well improved.

The consumption of expensive components seldom makes cost reduce significantly.In this regard, can mention pigment-blend approach, as the production of Powdered lacquer, the present invention can save 15% pigment consumption, and the cost of pigment will be higher than the cost of additive widely.Other advantage also comprises the reliability of working in reciprocating mode, the increase of simplicity, and mixed process control is simultaneously improved, and has good planning instrument, and carries more reliable.

Accompanying drawing of the present invention comprises:

Fig. 1 one has the cutaway view of the blender of two rotors, has friction pulley (rubbing wane) among the embodiment of this blender,

Fig. 2 is the partial sectional view of another embodiment of friction pulley,

Fig. 3 illustrates the view of the 3rd embodiment of the friction pulley suitable with Fig. 2,

Fig. 4 show blender shown in Figure 1 a plan view and

Fig. 5 shows an embodiment of blender, wherein leans against the process that rubs on the end wall of blender.

By the friction pulley 1,4,5 with special shape is provided between the stirring wheel 3 of rule, in mixer case 6, carry and mix, can be implemented in and powder is smashed in a plurality of shear planes, therefore when in small plane, mixing, be ground into the powder of piece simultaneously.Friction pulley 1,4,5 rotatablely moves by means of rotor 2, material is pressed against on the bottom wall of housing 6 to rub, and then applies bonding between the powder that enough shearing forces smash into piece.Friction process can also be provided by friction pulley 7 friction material on the end wall 8 of housing 6, as shown in Figure 5.

Can under low speed, carry out this mixed process, therefore can make moving of agglomerates softr.Method of the present invention and mixer apparatus can combine with other mixing principle, so that can realize the mixing of three groups of mechanisms simultaneously, because mix is that the shearing of process in small plane realizes that simultaneously whole particle cluster utilization diffusion and convection current are stirred and mix.

Mixer case 6 among the embodiment of the inventive method can utilize the friction pulley 1,4,5 on the parallel rotor 2 that is fixed on two direction of rotation, the part of friction pulley compaction of powders group, and on stationary housing 6, rub it.Under the effect of stress, in agglomerates the many places fragmentation will appear.Because the effect of shear stress will produce one and relatively move between each side on broken plane, move block relatively conveying of will bring in broken zone self and transport one.Agglomerating powders in this fragmentation zone will be crashed to pieces under the effect at shear pressure, and the various piece that forms the piece powder will be owing to relatively moving of occurring between two sides of shear plane after being crashed to pieces and is separated conveying each other.This has just realized the trickle mixed process of carrying out under low speed.

Can there be a kind of active medium to be distributed evenly at the interior mixing that comprises fine materials of an agglomerates therein, utilizes method of the present invention and mixing arrangement in all mixed process of the mixing of cohesive powder materials.In multiple industrial circle, all exist such mixed process, for example production of medicine, the mixing of the pigment in the various raw material in the coating, chemical reactant and catalyst, flour mixture, crayon, coal or binding material, the powder of toner and duplicator etc.

Method of the present invention and mixing arrangement can also be used for the mixing that small amount of liquid is that powder is interior, or the mixing of pasty product.

Friction pulley can have shape as shown in Figure 1, comprises that promptly one curves the pipe of shape as shown in the figure.So the friction pulley 1 of crooked tubulose is secured on the rotor 2, is distributing on the length at rotor between the stirring wheel 3 of blender.

In another embodiment shown in Fig. 2, wherein friction pulley 4 is bent, so that product is radially outwards dished out by friction while product along friction pulley 4.Friction pulley 5 among the embodiment shown in Figure 3 has the oval plate shape, and so shape makes product to be rubbed on wall 6.

Friction pulley 1,4,5,7 wants mixed material to select near the width basis of wall 6,8, perhaps is fit to specific conditions.Can produce friction pulley with tabular or tubulose.

Shown the present invention is particularly suitable for the light-duty blender of low peripheral speed as 0 to 3 meter per second, and it can bring good benefit.

Claims

1. be used for a kind of method that is applicable to the blender of cohesive powder materials, it is characterized in that being positioned at the wall (6 of each epitrochanterian friction pulley at blender with at least one, 8) go up the frictional adhesion material, so that make cohesive material be subjected to the effect of shearing force in the process that rubs between friction pulley and the wall (6,8).

2. the blender that is used for the mixing cohesive powders material, comprise rotor with a plurality of stirring wheels (3), these stirring wheels (3) are positioned at a space along rotor, it is characterized in that also on each rotor, providing at least one friction pulley (1,4 stirring wheel (3) except blender, 5,7), wherein the layout of friction pulley makes cohesive material be rubbed between friction pulley and wall (6,8) in mixer case.

3. blender as claimed in claim 2, it is characterized in that, on rotor (2), between the stirring wheel (3) of rotor, a plurality of friction pulleys (1 are installed, 4,5), wherein friction pulley is shaped as the bar that extends radially outward, surface with the circle that contacts with particle, and the outer end of friction pulley is bent to definite degree at least, make particle on each side of each friction pulley and its periphery, being rubbed on the friction pulley,, particle is mixed mutually so that provide the shearing force that aggregation is smashed by them.

4. blender as claimed in claim 3 is characterized in that, friction pulley (5) is the disk of radially arranging, this disk has circular edge, is ellipse or analogous shape on the axial direction.

5. as the described blender of one of claim 2 to 4, it is characterized in that friction pulley (1,4) is the pipe of outer end bending radially.

6. blender as claimed in claim 2 is characterized in that each rotor (2) has a friction pulley (7) at each end, and the end wall (8) that is used at blender is gone up the frictional adhesion material.