|Title of Invention||
A DIVICE FOR MIXING TWO OR MORE SOLIDS
|Abstract||The present invention is an improved device for mixing two or more solid materials of specific particle size and shape wherein the device is capable of achieving a high degree of mixing homogeneity. The device comprises a mixing member having either a solid or hollow body which is preferably configured as a conical or frusto-conical part. The mixing member is operated to rotate about its axis so as to highly randomize the path of the particle movement of the fed in materials, by effecting scattering of the fed in particle from the surface of the rotating mixing member.|
|Full Text||FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
[See section 10]
A DEVICE FOR MIXING TWO OR MORE SOLIDS;
RAM SWAROOP SHRIVASTAVA AN
INDIAN NATIONAL OF EWS 698,
VAISHALINAGAR, BHILAI, PIN-490 023,
THE FOLLOWING SPECIFICATION
PARTICULARLY DESCRIBES AND
ASCERTAINS THE NATURE OF THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFOMED.
AN IMPROVED DEVICE FOR MIXING SOLID MATERIALS.
FIELD OF INVENTION
The present invention relates to the field of mixing two or more materials. The present invention particularly relates to the field of mixing two or more solid materials for use in manufacturing industries especially pharmaceutical industries, process industries, cement industries and so on. More particularly, the present invention relates to the field of mixing two or more solid materials which have wide range of difference in fineness and more or less closer specific gravity values.
Conventionally mixing devices are widely used in manufacturing industries such as pharmaceutical industries, process industries, cement industries and so on. The selection of mixing devices is primarily based on the following parameters :
1. Type of materials to be mixed;
2. Size of materials to be mixed;
3. State of material like Solid - Solid , Liquid solid etc,
4. Required homogeneity in the mix.
In general, popularly known mixing devices are classified into two types namely i) Paddle mixing device ii). Pneumatic mixing device
The features and associated functions of the foregoing mixing devices are given herein:
Paddle mixing device :- The paddle mixing device has two or more paddles rotating about their own axes inside a mixing chamber (3) such that the rotation agitates the whole mass to be mixed and after some time such agitation results in the uniform mixing of the materials. The initial and running costs are low, while the mixing efficiency is fairly good for the paddle mixing devices. However, the gain in homogeneity is found to exponentially reduce with the retention time of the material inside the mixing device.
Pneumatic mixing device: - The pneumatic mixing device uses air as a medium to mix two different aggregates of very fine size by an agitation done by the air pumped into it and later on this air is taken out leaving the homogenous mix behind. Even though fairly good mixing efficiency is obtained, the initial and the running costs are found to be very high for the pneumatic mixing devices.
Since pneumatic mixing devices are used extensively wherever very high degree
of homogeneity is reguired and such pneumatic mixing devices are found to have
high initial and running costs, there has been a reguirement of finding a suitable
alternative to the pneumatic mixing devices wherein the replacement device is
capable of achieving very high degree of homogeneity comparable to or even
more than that achieved by the pneumatic mixing devices, at fairly low, initial and
Our inventor by determined experimentation and intuitive knowledge, has discovered that when a substantially conical mixing means is incorporated in the device for mixing two or more solid materials, the device is found to be capable
of achieving very high degree of homogeneity at substantially lower initial and running costs when compared with the pneumatic mixing devices.
OBJECTS OF THE INVENTION
i). It is an object of the present invention is to provide a mixing device for two or more solid materials wherein the device is capable of delivering high mixing efficiency comparable to pneumatic mixing devices, but consume very less power and thereby enable operation at substantially lower initial and running costs.
ii). An object of the present invention is to provide a mixing device for two or more solid materials wherein the device can be used for bulk material and as well as for continuous flowability solids.
iii). Another object of the present invention is to provide a mixing device for two or more solid materials wherein fugitive dust generation is substantially minimized.
iv). Another object of the present invention is to provide a mixing device for two or more solid materials wherein the device can be used as retrofit with other equipments very easily to attain higher homogeneity in mix and which can be used in series.
v). Yet another object of the present invention is to provide a mixing device for two or more solid materials wherein the device is very simple in construction, possessing easy maintainability, operability and transportation.
The objects and advantages of the invention would be apparent from the description of the preferred embodiments given herein.
SUMMARY OF THE INVENTION
The present invention discloses an improved device for mixing two or more solid materials wherein such solid materials having predetermined particle size and shape and such device comprising a mixing chamber preferably in cylindrical form having a wider opening at one end and a narrow opening at the other end.
A mixing member preferably configured in conical or frusto-conical form, is located at a substantially central portion, within the mixing chamber and maintaining a predetermined gap against the inner wall surface of the mixing chamber. The mixing means is rotatable preferably along a plane which is preferably in coincidence with the axial plane of the mixing chamber. The mixing means is operated to rotate about its axis so as to highly randomize the path of the particle movement of the fed in materials, by effecting scattering of the fed in particle from the surface of the rotating mixing means.
BRIEF DESCRIPTION OF DRAWINGS:
To complement the description that is being given and in order to promote a better understanding of the characteristics of the invention in accordance with a practical embodiment of the same and as an integral part of the said description a set of drawings accompany it in which, in an illustrative and non-restrictive way, the following are represented:-
Fig. 1 shows the top and the front views of the device for mixing two or more solid materials according to one embodiment of the present invention.
Fig 2 shows the top and the front views of the device when used in series conjunction with another device according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS :
The present invention discloses a mixing device for two or more solid materials such materials having particle size in the range of 1 micron to 5 mm.
Referring to Fig 1, the device comprises a hollow mixing chamber (3) which has a cylindrical part (4) joined to hopper (5) at one end. The mixing chamber (3) is preferably held in vertical position during mixing operation. The capacity of the mixing chamber (3) may be suitably configured according to the mixing requirements and the volume of the materials to be mixed. The inclination of the hopper (5) is in the range of 50 degrees to 70 degrees most preferably the inclination of the hopper (5) is 55 degrees.
A mixing member is located substantially at the central portion of the cylindrical part (4) of the mixing chamber (3), maintaining a predetermined distance against the inner wall surface of the said mixing chamber (3). The mixing member may be configured either as a solid or a hollow body and is preferably located closer to the wider part (6) of the mixing chamber (3). The mixing member is capable of rotating about an axis which is preferably oriented along the vertical plane and in coincidence with the axis of the mixing chamber (3). For the purposes of varying the mixing efficiency and performance, the mixing member may also be configured to rotate about an axis different from the vertical axis.
The mixing member preferably has a smaller cross section at one end and a larger cross section at the other end.
According to one embodiment of the present invention, the mixing member is configured as a cone having an apex at the upper side and the base at the lower side. The cone may be in hollow or solid form. The diameter at the base of the
cone is preferably in the range of 150 mm to 400 mm, and most preferably the base diameter of the cone is 250 mm.
In another embodiment (not illustrated), the mixing member is preferably configured as a frustro-conical body wherein the body is either hollow or solid.
Preferably, the mixing member has a pyramidal shape preferably with its apex cut to a frustrum and the body part having either a hollow form or a solid form.
Materials preferably two or more in number having difference in particle size which may be in the range of 1 micron to 5 mm, and which are required to be mixed are fed into feeding openings (10,12) of the mixing chamber (3). Simultaneously, the mixing member is operated to rotate about its axis so as to highly randomize the path of the particle movement of the fed in materials, by effecting scattering of the fed in particle from the surface of the rotating mixing member. The mixing member is operated by a conventional drive means such a conventional drive motor such as a single phase motor of 200 Watts, 900 rpm rating.
The mixing device according to the present invention is capable of mixing up to three different solid materials (A, B and C) at a time and is capable of achieving homogeneity wherein from any ten samples of 5mg, within the standard deviation of 1 % of the average value. The bulk density of the aggregate is preferably less than 20% of the heavier aggregate.
In this application, the term "cone" in relation to the mixing member, is used for the purposes of illustration only. It is not to be construed that the shape of the mixing member is limited only to the shape of a cone, but also means and includes all forms and shapes that would function substantially in the same way to achieve substantially similar results.
Referring to Fig 2, the mixing device may also be operated in series conjunction with another mixing device. Such device used in conjunction preferably has a similar configuration.
Thus, while there have been shown and described and pointed out fundamental novel features of the present invention as applied to preferred embodiments thereof, it will be understood that various omissions and substitutions and changes in the form and details of the methods described may be made by those skilled in the art without departing from the spirit of the present invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Substitutions of elements from one described embodiment to another are also fully intended and contemplated. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
1. A device for mixing two or more solids comprising :
a chamber for accommodating the materials to be mixed;
a mixing member driveably located within the said chamber, at a -substantially central location of the said chamber characterized in that the said mixing member comprises a first end portion and a second end portion wherein the cross sectional area of the first end portion is less than the cross sectional area of the second end portion. :
2. The device according to claim 1 wherein the mixing member is a cone.
3. The device according to claim 2 wherein the mixing member is a frustro-
4. The device according to claim 1 wherein the mixing member is a pyramid.
5. The device according to claim 1 or 2 wherein the diameter of the base of
the cone is preferably in the range of 150 mm to 400 mm.
6 The device according to claim 5 wherein the diameter is preferably 250 mm.
7. The device according to claim 1 wherein the chamber for mixing comprises
a cylindrical part and a hopper, the said cylindrical part having openings for feeding in materials for mixing and the hopper having an opening for extracting the said materials after mixing.
8. The device according to claim wherein the mixing member is located within the cylindrical part of the chamber for mixing.
9. The device according to any foregoing claim wherein the mixing member is driven by a conventional drive means.
10. The device according to claim 9 wherein the mixing member is driven by a conventional single phase drive motor.
11. TKe device according to any of the foregoing claims used in conjunction with another device of substantially similar type.
Dated this 6tn day of December, 2002.
FOR RAM SWAROOP SHRIVASTAVA By His Agent
(MANISH 5AURASTRI) KRISHNA A SAURASTRI
|Indian Patent Application Number||1099/MUM/2002|
|PG Journal Number||28/2009|
|Date of Filing||09-Dec-2002|
|Name of Patentee||RAM SWAROOP SHRIVASTAVA|
|Applicant Address||EWS 698. VAISHALINAGAR, BHILAI PIN-490023, CHATTISGARH, INDIA|
|PCT International Classification Number||B01F|
|PCT International Application Number||N/A|
|PCT International Filing date|