RU2739835C1 - Rotary mixer-granulator - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention can be used in food, pharmaceutical and chemical industries. Rotary mixer-granulator comprises vertically arranged cylindrical housing 4 with cover 5. In housing 4 there is a mixer in form of vertical shaft with mixing blades 14 arranged horizontally on it, drive 15 of mixing blades 14 of vertical shaft, electric motor 2, driving horizontal shaft with mixing blades 3, feed pipe of initial loose product 8, nozzle for supply of binding solution 6, window for discharge of finished product 10. Mixer-granulator also comprises unbalance-type vibration exciter 7 for transferring product into vibration-liquefied state, movable shutter 11, controlling release of granulometric composition of finished product, mesh for separation of large agglomerates 9, branch pipe for discharge of finely dispersed fraction 1. Housing is installed on four compression springs 13.

EFFECT: invention increases stability of the granulometric composition of the product and homogeneity of the multicomponent mixtures.

1 cl, 1 dwg

Description

The invention relates to mixer granulators of bulk materials and can be used in food, pharmaceutical, chemical and other industries.

Known rotary-blade granulator of bulk materials [1], which contains a vertical cylindrical housing, inside which is a shaft with mixing blades and an elastic blade. Perforated tubes for air supply are radially located on the inner surface of the housing between the blades. Vortex-forming blades are fixed on the shaft at the bottom to create the effect of a fluidized bed in the original powder mixture.

The known granulator of bulk materials has the following disadvantage, with the coaxial arrangement of mixing vortex-forming blades on the shaft rotating in parallel planes, there is a relatively low degree of mixing of the original powder components. This disadvantage is especially fundamental when producing multicomponent granular materials.

The closest of the known analogs is a rotary mixer-granulator [2].

The known rotary mixer granulator contains a housing communicated with a source of compressed air, a mixer installed in the housing in the form of a vertical shaft with mixing blades horizontally placed on it, a loading window and an unloading device, equipped with a horizontal shaft with mixing blades installed vertically, a hatch for binder supply substances and a filter for releasing air and retaining the granulated product in the housing, while the unloading means is made with a valve.

The disadvantages of this rotary mixer-granulator include the unstable obtained granulometric composition.

The technical task is to increase the stability of the particle size distribution in order to obtain a homogeneous multicomponent mixture.

The technical result is achieved due to the fact that after the end of the granulation process, the electric motor of the blades and the drive of the mixing blades are turned off and the drive of the vibration exciter of the unbalance type is turned on, the product is transferred to a vibro-fluidized state, this leads to the fact that large formed particles rise upward, in turn small particles, with greater activity, occupy a position at which the minimum consumption of potential energy occurs (the segregation process is observed), then the flap is lowered to a certain height depending on the properties of the feedstock and the required final particle size distribution of the finished product, and the granules move through the mesh to separate large agglomerates into window for removal of the finished product and transfer to the tray.

As a result of the design described above, the proposed rotary mixer-granulator is characterized by a minimum content of unformed granules and a stable particle size distribution.

The proposed device is shown schematically in the drawing, where FIG. 1 shows a general view of a rotary mixer-granulator.

The rotary mixer-granulator contains a branch pipe for withdrawing a fine fraction 1, an electric motor 2, mixing blades 3 located on a horizontal shaft, located horizontally on a vertical shaft, a housing 4, a cover 5, a binder solution supply pipe 6, an unbalanced vibration exciter 7, a feed pipe for the initial bulk product 8, mesh 9, finished product outlet 10, movable flap 11, tray 12, four compression springs 13, mixing blades 14, located horizontally on the vertical shaft of the mixer, drive of mixing blades of the vertical shaft 15, frame 16.

Rotary mixer granulator works as follows. The original bulk product enters through the nozzle 8 into the housing 4 mounted on four compression springs 13 and equipped with a cover 5. The mixer blades drive of the vertical shaft 15 is turned on and the product begins to move along the inner surface of the housing 4, while the mixing blades have a certain shape that allows the product to be guided into the zone of the blades 3. Then the electric motor 2 is turned on, which rotates the mixing blades 3 mounted on the horizontal shaft. The binder solution is supplied through the nozzle 6.

After the end of the granulation process, the electric motor 2 of the mixing blades 3 and the drive 15 of the mixing blades 14 are turned off. The vibration exciter of the unbalance type 7 is turned on and the product is transferred to a vibro-fluidized state. Large formed particles rise upward, in turn, small particles with greater activity occupy a position at which the minimum consumption of potential energy occurs (the segregation process is observed), then the movable gate 11 is lowered to a certain height depending on the properties of the feedstock and the required final granulometric composition of the finished product, and the granules move through the mesh 9 to separate large agglomerates into the window for removing the finished product 10 and transferring to the tray 12.

At the end of the withdrawal of the finished product, the vibration exciter of the unbalance type 7 is turned off, the movable damper 11 moves to the upper position, and the initial bulk mixture is fed through the branch pipe 8 to the required level. And the process is repeated from the beginning.

At the end of the work, the product is removed from the rotary mixer-granulator through the fine fraction 1 outlet with the help of 14 mixing blades receiving rotary motion from the 15 drive.

Thanks to this technical solution, the number of unformed granules is reduced, the particle size distribution of the resulting product is stabilized.

Literature

1. Pat. SU 1662666 A1, B01J 2/10. Rotary-blade granulator / Bogorodsky A.V., Bezlepkin V.A., Lyapin B.P .; declared 4654839/26, 01/06/89; publ. 15.07.91 Bul. 26.

2. Pat. RF 2174868, B01J 2/10. Rotary mixer-granulator / Vasiliev V.A., Dzyuba E.L., Zakharov N.V., Javadov Igor Javad oglu; declared 2000132288/12, 25.12.2000; publ. 20.10.2001. Bul. No. 29.

Claims (1)

Rotary mixer granulator containing a housing with a cover, a mixer installed in the housing in the form of a vertical shaft with mixing blades horizontally placed on it, a horizontal shaft with mixing blades, an electric motor driving a horizontal shaft with mixing blades, a drive for mixing blades of a vertical shaft, a branch pipe supply of the initial bulk product, a branch pipe for supplying a binder solution, a window for withdrawal of the finished product, characterized in that it additionally contains a vibration exciter of the unbalance type for transferring the product to a vibrating fluid state, a movable flap that regulates the release of the final granulometric composition of the finished product, a grid for separating large agglomerates, a branch pipe fine fraction, while the body is mounted on four compression springs.

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