RU1791720C - Weigher - Google Patents

Abstract

Usage: dosing of bulk and low abrasive materials. SUMMARY OF THE INVENTION: A sleeve in the form of a spiral or with slots is fixed to the inner surface of the outlet pipe of the hopper. Curved blades are sequentially fixed to the screw spiral. The upper end of each blade is attached to the screw shaft. Material is transported from bottom to top and sprinkled through the cavity of the screw shaft. The blades move the material to the edge of the screw spiral, where it enters the gap and interacts with the fixed sleeve. The sleeve is mounted on the inner surface of the outlet pipe of the hopper. 2 s.p. f-ly, 3 ill.

Description

: The invention can be used in the food, mining, chemical and metallurgical industries, in the construction industry and in the production of abrasives for dispensing loose non-bound little abrasive substances.

: th As an analogue, a screw feeder was used, consisting of a hopper and a casing with inlet and outlet openings. The outlet is provided with an elastic damper. Inside the casing, a spiral is rotated with no central pipe. Inside it, near the outlet, a fixed streamlined sealant is mounted. During the dosing process, the material from the hopper is fed in a rotating spiral to the outlet. Here it is sealed first with a seal, then with an elastic damper. And only after this comes the length of use;

The advantages of the analogue include the compaction of the material during the dosing process: compaction narrows the range of variation of some physical and mechanical characteristics of the material, for example, the actual density. And this improves the accuracy of dosing.

The disadvantages of the analogue include the presence of large passive zones in the volume of the material, which reduce the efficiency of its use. In doing so, the seal and the shutter are subjected to unreasonably intense abrasive wear.

As a prototype, a volumetric dosing device was used. It consists of a hopper, in the lower part of which a cylindrical dosing chamber is installed. It has a fluoroplastic sleeve. A stepped vertical screw is placed coaxially to it in the chamber: the spiral of the lower part of the screw is equal in diameter to the internal

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the diameter of the sleeve, and the upper part of the spiral is of smaller diameter ..

In this dispenser, the abrasive effect of the material on the casing is prevented by the installation of a fluoroplastic sleeve. However, the low coefficient of friction of the fluoroplastic paired with most known materials reduces the conveying ability of the screw. In addition to the rotation of the screw, the rotation of the screw facilitates the e-pro-prophylic movement of the mother directly to the central pipe, which delighted the net zones. Both of these disadvantages reduce the reliability of the dispenser, i.e. its performance and accuracy.

The aim of the invention is to increase the reliability of the dispenser.

The goal is achieved by sequentially installing curved blades on the screw spiral, when the upper end of the blade is mounted on the screw pipe and the lower end does not reach the edge of the spiral at a distance equal to the height of the curved blade. The sleeve installed inside the casing either has slots or is made in the form of a spiral or mesh. . .-

Figure 1 shows a side view (a) of a section of a screw dispenser and section AA. (b) Fig. 2 shows the embodiment of the sleeve (a and b) inside the casing and the embodiment of curved blades (c) on the screw spiral, Fig. 3 illustrates the principle of operation of the dispenser.

The screw dispenser, in figure 1, consists of the elements necessary for its normal operation - a hopper, agitators, a sleeve in a casing, and the like. (conditionally not shown in the drawing) and a screw with a hollow pipe 1 and a spiral 2. Curved blades 3 are mounted on the spiral. The sleeve 4 is fixed in the casing 5. The dispenser operates as follows. The drive rotates the pipe 1 (Fig. 1). Spiral 2 captures the material from the bottom of the hopper and transports it up. With THIS, Curved blades 3 (see FIGS. 2 and 3) move the material to the edge of the spiral, where it interacts with sleeve A, and its friction against the casing 5 is either absent or minimized. In the upper part of the tneck, the material is sprinkled from the spiral through the auger pipe for use,

In more detail, the action of the dispenser is illustrated in FIG. Curved blades

move the material to the sleeve. This increases the reliability of the dispenser due to the fact that almost the entire volume of the dosed material interacts with the stationary

sleeve. Another advantage of the proposed designs is that the dosing material clogs the holes in the sleeve. Thus, the friction of the material against the structural element is partially replaced by the friction between the layers of material.

On Fig.3 also shows the options for the operation of curved blades. Their upper ends are in all cases attached to the central tube, but the blades themselves are made so that their height is less than the distance from the end of the blade to the edge of the spiral (Fig. 3a), i.e. m "I; their height is equal to this distance m I (Fig. 36) and the height of the blades exceeds the distance from their lower ends to

the edges of the spiral, i.e. m: And (Fig. Sv).

In the cross section m x the upper boundary of the material is formed under the action of the force t - and its excess above this boundary is poured over the blades. Therefore, it is the material cross section that can be considered with the position of the passage of bulk materials through holes of different shapes. Then the schemes m $ 4 and I can be considered as variants of slit-like openings. A scheme

m I (Fig. Zb) - as a variant of an opening close to a circle providing the best conditions for transporting material.

Claims (3)

1. A dispenser comprising a sleeve fixed on the inner surface of the outlet pipe of the hopper, in which a rotary drive coupled to the drive is coupled vertical screw, characterized in that, in order to increase reliability, curved blades are introduced into it, sequentially fixed to the screw spirals, the upper end of each curved blade attached to the screw shaft and the lower one not reaching the edge of the spiral at a distance equal to the height curved blade, while the sleeve is made with a slot mi .; : 2. The dispenser according to claim 1, with the fact that the sleeve is made in the form of a spiral. 3. The dispenser according to claim 1, with tea and with the fact that the sleeve is made in the form of a grid. Editor Order 147 ,. . Ts :: a: ::;: ;;;; :::. Compiled by A. Piman: 6h; -:,; .. Tehred M. Morgenthal - corrector m: ke, retsman Tira.zh PodShsnbe VNIIIPI of the State Committee for Inventions and Discovering under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Rauska nab 4/5 Production and Publishing Plant Patent, Uzhhorod, 101 Gagarin St.