SU367900A1 - DEVICE FOR APPLYING PROTECTIVE COATINGS - Google Patents

Description

one

The invention relates to medical technology, namely, devices for applying protective coatings, for example, on tablets and dragees.

The devices of this designation are known, made in the form of a movably mounted on an axis of rotation of the drum with loading and unloading hatches and sealing partitions, as well as containing a rotational drive, means for supplying and discharging heat carrier and spraying a liquid product. A disadvantage of the known devices is their low productivity due to the periodicity of the process.

In the proposed device, to intensify the process and improve the mixing blade blades arranged in several rows along the axis, they are made hollow and, by means of longitudinal and transverse partitions mounted into it, are divided into two isolated cavities, one of which is provided with openings for the removal of the vapor-gas mixture, and the other sequentially arranged in several rows along the length of the axis mixing blades and nozzles for the liquid product, connected to the pipeline inside the axis. The drum has corrugations.

Mixing blades can be made with L-shaped curved ends, and the blades of one row can be positioned at an angle to each other under the axis of rotation of the drum.

FIG. 1 shows the described device, in longitudinal axial section; in fig. 2 is a cross-section along aa and a in fig. one.

The device contains a horizontally arranged cylindrical drum / ring corrugations. The axis 2 of the rotation of the drum is made hollow. It is divided by a longitudinal partition 3 in a diametrical section and a transverse partition 4 into two isolated cavities, one of which is provided with windows 5 for removal of the vapor-gas mixture, and the other successively arranged in several rows along the axis by mixing loiasts 6, through which the heat transfer fluid enters a layer of the processed material (tablets), as well as nozzles 7 for a liquid product - coating components. The drum has hatches 5 for loading and unloading material.

The blades 6 are made with L-shaped curved ends, and the blades of one row are located at an angle to each other under the axis of rotation of the drum.

The device works as follows.

Axis 2 with blades mounted in the drum. The required number of tablets for coating with a protective coating or film is periodically loaded into the drum through the hatch 8.

A drive of the device, for example, an engine 9 with a gearbox 10, imparts a rotary motion to the drum at a certain speed, for example 20-30 rpm. Using the nozzles 7, the tablets are irrigated with syrup or emulsion. The warm air enters through the hollow axis 2 into the hollow blades 6 and, flowing out into the layer of tablets, drains them. The rotating drum carries the tablets under the action of centrifugal force. Tablets rise along the walls of the drum to a certain height and then fall down, which ensures their good movement throughout the layer, and the successive alternation of irrigation zones and drying zones in the longitudinal and radial sections ensures the intensification of the process due to the continuous supply of syrup through the nozzles and warm air through the blade. m and makes it highly productive. This eliminates mechanical damage to the tablets, since the blades are fixed.

To improve the agitation of the tablets, the drum may be corrugated. The number of irrigation zones and drying zones can be selected according to the initial loading of the tablets. It is also possible to regulate the operation of the irrigation and drying zones.

During operation, the position of the axis with the blades can be changed using, for example, a toothed turning device.

The vapor-gas mixture is withdrawn from the drum through windows 5 in the upper cavity of a fixed hollow axis 2, separated by a longitudinal partition from its lower cavity. Such a drain creates the necessary density in the joints, which provides sanitary requirements. In the lower cavity of axis 2, supply pipes for heat carrier and sprayed mixture are placed.

The transverse (end) partitions 4 to 5 of the hollow axis prevent the gas-vapor mixture from penetrating into the lower cavity of the axis. The material is discharged through the hatch 8. There may be several hatches and they can be placed in several zones of the drum for 0 convenience of unloading the material.

Subject invention

Claims (2)

1. A device for applying protective coatings, for example, on tablets and dragees, made in the form of a movably mounted on the axis of rotation of the drum with loading and unloading hatches and sealing partitions, as well as containing a drive of rotational motion, means for feeding and 0 removal of the heat carrier and spraying of the liquid product, characterized in that, in order to intensify the process and improve the quality of the applied coating, the axis of rotation of the drum is made hollow and by means of built-in longitudinal and transverse partitions into it divided into two isolated cavities, one of which is provided with openings for removal vapor-gas mixture, and the other - sequentially arranged in several rows according to 0 to the length of the axis by moving blades and nozzles for the liquid product, connected to the pipeline inside the axis; at the same time the drum has corrugations. 2. The device according to claim 1, characterized in that 5 that the mixing blades are made with L-shaped curved ends, and the blades of the same row are angled to each other under the axis of rotation of the drum.