SU952676A1 - Apparatus for metering-out loose materials - Google Patents

Description

The invention relates to a packaging technique, namely, devices for dispensing bulk materials.

A device for metering bulk materials is known, which contains a receiving bin, which is rotatably mounted with a loading chamber with EI measuring containers located on it.

However, in the known device, under the condition of centrifugal loading and unloading of the measuring containers, the Coriolis force arising during the unloading forces the bulk material to the wall of the measuring container, which increases the force of material friction, against the wall of the measuring container. This leads to a decrease in the speed of dispensing bulk material and an increase in the discharge time of the measuring capacity.

The aim of the invention is to increase productivity.

This goal is achieved by the fact that in the device for dispensing bulk materials containing a receiving hopper mounted for rotation, the loading chamber with measured containers located on it, the measuring tanks are formed by two pointed-shaped lobes pivotally connected to the loading chamber.

In this case, the axes of the hinges are located in the direction of rotation of the measuring containers.

The drawing shows a device for dispensing bulk materials, a vertical section.

Claims (2)

The device for dosing bulk materials contains a receiving hopper 1 mounted on a bed 2, on which a shaft 4 is fixed in bearings 3 with a loading chamber 5 mounted on it, a feed screw 6 and a driving pulley 7. Petals 8 and 9 are hinged on the loading chamber 5 measuring containers, which have a pointed shape, which in the closed state form the volume necessary to obtain a dose of mass tonnes. On the leaves 8 and 9 of the measuring containers there are fixed rollers 10 that are in contact with copiers 11 mounted on the base 2. Springs 12 are realized are the power closure of the rollers 10 on the copiers 11. The receiving funnel 13 is also fixed on the bed. The bunker 1 has a transitional pipe 14 fixed through the bearings 15 in the cup of the loading chamber 5. The cutter 16 is rigidly fixed on the transitional pipe 14. From an electric motor through a belt drive (not shown), the pulley 7 with the shaft 4 and with the loading chamber 5 rigidly seated on the last loading chamber 5 and the feeding screw 6 rotates. The screw 6 feeds the bulk mother 5 from the hopper 1. The bulk material, having entered the loading chamber 5, under the influence of centrifugal forces, is thrown to its peripheral walls and fills the measuring containers formed by the petals-5 and 8 and 9. When the measuring containers move around the circumference in a certain area, the material in them separates from the material the loading chamber with a fixed cutter 16. Subsequently, the measuring containers located under the cutter 16 enter the discharge zone. The copiers 11 in this zone are designed in such a way that, under the influence of the springs 12, the petals of the measuring capacity open. At the same time, the bulk material experiences aerodynamic air resistance and does not encounter resistance from the side of the vessel walls. The airflow resistance can be written as vFС.СРР-, (1) where С is the resistance coefficient; w - characteristic body area; f is the air density; V is the dose rate. Consider the form of the dose pointed, the resistance coefficient Cd is 0.2-0.4. With the cylindrical shape of the container present in the known device, the resistance of the bulk material is equal to 1 F + m + 2m-t% vy (2) where C is the resistance coefficient for the cylindrical dose, C 0.85-0.91; m is the mass of the dose; a is the acceleration acting on the bulk material; - lateral pressure ratio. , neither; {- shear coefficient of the bulk material on the material capacity; (fvj is the angular velocity of rotation. From a comparison of only the first terms in formulas (1) and C), it can be concluded that the use of measuring containers made of petals is appropriate, since the resistance to the outflow of bulk material from them is less, which leads to a reduction in the unloading time tp measuring containers and increasing the discharge efficiency of measured doses of bulk material. The location of the hinge axes in the direction of movement of the measuring tanks allows them to be quickly brought out of contact with the bulk material, otherwise The Coriolis inertia force presses the bulk material to one of the petals of the measuring capacity, thereby adding friction of the bulk material to the petal of the measuring capacity, which is undesirable. Upon further movement through the copiers 11 of the rollers 10, the petals 8 and 9 come off and the measuring capacity goes out from under the shutter. In the following, the process is repeated. Decreasing the time tp allows reducing the time for performing the dosing operation, therefore, it allows to increase the productivity of the device. The economic effect from the introduction of one machine is 9 thousand rubles. Claim 1. Device for metering of sye-puch materials, containing receiving hopper, rotatably mounted loading chamber with measuring containers arranged on it, characterized in that, in order to increase productivity, measuring tanks are formed by two pointed shaped petals hinged to the loading chamber. 2. The device according to claim 1, about tl and the fact that, the axis of the hinges are located in the direction of rotation of the measuring containers. Sources of information taken into account in the examination 1. USSR author's certificate number 603605 ,. cl. B 65 B 1/14, 1976. 9 W P