CS211513B1 - Device for dispensing powdered or granulated material - Google Patents

Abstract

The purpose of the invention is to ensure accurate and uniform or controllable dosing of even very small quantities of materials. The above purpose is achieved by a device consisting of a hollow body into which a hopper pipe opens towards a rotating horizontal feeder with cavities to which the material is to be dosed and a lower dosing opening so that the hopper pipe /1/ provided with an opening and opening from above is in close sliding contact with the outer surface of the feeder /3/ provided with cavities /2/ or there is an adjustable gap between them, while the opening of the hopper pipe /1/, opening above the cavities /2/, is in the direction of rotation of the feeder /3/ in front of the upper dead center of the cavities /2/ and above the collection opening /10/, which is in the direction of rotation of the feeder /3/ behind the lower dosing opening and is separated from it.

Description

1 211513

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for dispensing powdered or granulated material, particularly for accurate and uniform dosing of small amounts of material. At present, there are considerable problems with uniform and accurate powder dosing of various materials. or granular state. These problems are particularly great when uniformly dosing very small amounts of the substance, for example 10 g / h, of particulate matter having a particle size of less than 20 µm and so on. Such metering requirements are imposed, for example, in the case of hot, styrene silicates, or in the production of single crystals, where the uniform supply of granular material is a necessary condition for satisfactory product quality. Several bulk dispensers are known to be used to convey bulk materials to their processing site. One device consists of a plunger moving in the body ‘mechanically, pneumatically or otherwise / e.g. čs. pat. No. 160,341].

The bulk material is usually conveyed by compressed air to the volumetric space formed by the body walls, and the plunger and the compressed air supplied by the annular channels are emptied out of the space while the plunger is in motion. This type of device has many serious shortcomings. The carrier gas, whose presence is often undesirable, also enters the apparatus together with the feed material. The design of the device does not ensure perfect emptying of the metering space and therefore there is not sufficient dosing accuracy. There is also a partial crushing of the granular material and the considerable walls of the device. Carrier gas consumption is also high.

The structure of the device is difficult, because problems arise especially when sealing the plunger in the dispenser body. Another known pneumatic powder dispensing device operates by brushing the powder over a stationary perforated septum through which the carrier gas is fed. 122,463]. However, such a device is difficult to maintain and fail. Another device is based on discharging the powder through an opening in the membrane, which is a current cartridge, and which is vibrated by the vibrator. The free-flow cross-section of the discharge chute is changed by changing the position of the shutter on the screw-threaded rod. The disadvantage of this device is the difficult and inaccurate adjustment with time to vary the amount of material to be dispensed at. unsteady events. This device does not allow to dispense any small quantities of loose polydisperse materials evenly, with great precision and reproducibly.

The aforementioned drawbacks are eliminated by a device for dispensing powdered or granulated material, consisting of a hollow body of the device, into the container. through which the discharge tube opens to the rotary axis of the horizontal cavity feeders for the material to be dispensed and to the dispensing opening for dispensing the material, the principle of which is that the opening provided by the hopper is with the cavities provided with the outer surface of the rotary shaft a feed feeder in close sliding contact or a gap is adjustable therebetween, the chute of the feed pipe, projecting above the cavities, is in the direction of rotation of the feeder in front of the dead center and above the picking opening located in the direction of rotation of the feeder behind the dosing opening. The dispensing aperture for discharging the dispensed material to the point of use of the conduit of excess dispensed material poured over the aperture opening is separated from each other. In order to prevent overflow of the dosed material from the hole, the dispensing and collecting opening can be separated from each other by a partition, a device between the dispensing and collecting opening extending to the cavity of the dispenser surface. It is advantageous if the lower part of the feeder surface provided by the opening is spring-loaded. and the collecting opening of the discharge pipe is on-cavity into the collecting means located in the telescoping outer tube on the cavities

The device according to the invention allows accurate and uniform dosing of very small amounts of polydisperse granular materials and a continuous, accurately controllable change in dosage depending on the time. The device is simple, reliable and durable.

In the accompanying drawings, an example of an apparatus according to the invention is schematically illustrated, in which: FIG. 1 is a partial cross-sectional view of the apparatus and, in FIG.

Claims (3)

21 1513 2 An exemplary device consists of a hopper tube which passes through a seal in the top of the device 5, and by a compression spring 6 abutted by one end of the inner side wall of the device body and a second end by a projection on the spout tube 1 provided with cavities 2 provided with an outer surface of the rotary The feeder 3 is rotatably mounted in the side walls of the device body. The opening in the bottom of the feed tube of the cavity extends over the top dead center of the cavities 2 in the rotation of the feeder 3. a pick-up opening 10 with a pick-up pipe 11 for discharging the excess metering material to be dispensed along the mouth of the opening of the feed pipe and in the direction of rotation of the cavities 2-also a spherical dispensing opening 7 with a dispenser pipe 8 for dispensing the dispensed material of the undrawn management. The dispensing opening 7 and the collecting opening 10 are interconnected therebetween by a baffle 42 fixed in the lower part of the device body 5 and extending to the outer surface of the dispenser 3. Device operation is sequential. From the container above the device, the material dispensed overflows the discharge pipe 11 into the cavities 2 of the feeder 3 rotating about a horizontal axis. From the cavities 24, when the feeder 3 is rotated, the material to be dispensed is discharged into the dosing opening 7, from where the dosing tube 8 is discharged to the connected device. A small amount of dispensed material which, when filling the cavities 2, is poured over the opening of the feed pipe 7, falls over the surface of the dispenser 3 into the collecting opening 10 * from where it is discharged through the collecting tube 11 to the container. In order to ensure uninterrupted and uniform dosing, it is advisable to connect a vibration device to the feed tube or to the entire device. Equipment of this kind can be used mainly in laboratories to accurately and evenly dispense solid bulk reagents or catalysts into reactors, to evenly distribute bulk solids whose frequency is divided, and to stagnate in continuously operating sorting devices, or if these are devices are used for preparatory quantities of particles sorted into narrow actions. In the industry, it is possible to use a consistent and uniform dosing of small amounts of trace substances into the mixture. predmetvynAlezu A device for dispensing powdered or granulated material consisting of a hollow body of a device into which a feed tube opens towards a horizontal rotary dispenser with a dispensing material and a lower dispensing opening for dispensing a material from a device, characterized in that the opening provided with a hopper is provided with an opening. the tube (1) is in close contact with the outer surface of the rotary horizontal feeder (3), hollowed with cavities (2), or there is a gap therebetween, the opening of the chute (1) opening above the cavities (2) being in the direction of rotation of the feeder (3) in front of the top dead center (2) and above the picking opening (10) which is in the direction of rotation of the feeder (3) downstream of the lower dosing hole (7) and is separated from the dosing opening (7). 2. Apparatus according to claim 1, characterized in that the dispensing opening (7) and the collecting opening (10) are separated from each other by a partition (9) to prevent the material being dispensed from the cavities (2) into the collecting opening (10) located in the device body. (5) between the dispensing aperture (7) and the collecting opening (10) and extending to the outer surface of the cavity dispenser (3) (2). 3. Apparatus according to claim 1 or 2, characterized in that the apertured lower portion of the pouring tube (1) is provided on the cavities (2) with the surface of the dispenser (3) being spring-loaded. 2 drawings of a cross-hatch. n. pN Introduction 7, Mott