GB2173773A

GB2173773A - Feeding apparatus mainly for admixing wet dressing agents

Info

Publication number: GB2173773A
Application number: GB08524073A
Authority: GB
Inventors: Istvan Gyurk; Jeno Jaky; Laszlo Mendre; Laszlo Tabori; Istvan Varga
Original assignee: DEBRECENI MEZOEGAZDASAGI; Debreceni Mezogazdasagi Gepgyarto Vallalat
Current assignee: DEBRECENI MEZOEGAZDASAGI; Debreceni Mezogazdasagi Gepgyarto Vallalat
Priority date: 1985-04-17
Filing date: 1985-09-30
Publication date: 1986-10-22
Also published as: PL145021B1; SU1510710A3; HUT39549A; DD243630A5; DE3532447A1; GB8524073D0; PL255503A1; DE3532447C2

Abstract

The invention concerns feeding apparatus, mainly for admixing liquid dressing agents to seeds, comprising a supply tank (1), a feed pipe (2) extending into the supply tank (1) and an overflow pipe (3) arranged on the side of the supply tank (1) at a suitable height. The tank (1) has a rotary or rocking shaft (7) carrying rigidly fixed disk (5), and an axially slidable disk (6), at least one dispensing element (7) arranged on the circumference of the fixed disk (5), a number of prismatic bodies or cylinders (8) coaxially arranged inside the dispensing element (7), fitted in the slidable disk (6), the number of such bodies or cylinders (8) being equal to the number of dispensing elements (7). Arranged inside the circular track of the movement of the dispensing elements (7) and above the height of the overflow pipe (2), there is positioned an open outlet trough (9). The sliding movement of the axially slidable disk (6) is governed by a control device (10). The apparatus (11) is connected to a moving part arranged in the path of the flow of seeds to match the liquid delivery rate to the seed flow rate. <IMAGE>

Description

SPECIFICATION Feeding apparatus mainly for admixing wet dressing agents The invention relates to feeding apparatus mainly for admixing dressing agents, comprising a supply bin, a supply feed pipe for the supply of liquids projecting into the supply bin and an overflow pipe arranged on one side of the supply bin at a convenient height.

The chemical industry produces more and more liquid dressing agents from which relatively small quantities are needed for dressing thus reducing the disadvantage of wet dressing, i.e. that the dressing agent considerably increases the liquid content of the seeds. On the other hand, the advantage of wet dressing over dry powder dressing is that it is much more 'environment/ friendly'. The adherence of the dressing agent to the seeds is more reliable than that of puiverulent dressing agents, hence it is more efficient than the latter.

Consequently, the wet dressing is increasingly used for dressing of seeds.

In dressing installations the admixing of the liquid for dressing is carried out by feeders. The quantity of the dressing liquid dispensed has to be controllable within wide limits and with a high degree of accuracy, uniformity and homogeneity.

There are three mutually distinguishable systems for admixing liquids: hydraulic dispensing devices with pumps and pressure control valves; pumps with adjustable delivery; and feed devices fitted with scooping ladles.

The drawback of a hydraulic feeding system is that it is a heterogeneous system comprising a centrifrugal pump, a control valve and a flowmeter, wherein the narrow cross-section of the valve makes it liable to clogging thus rendering the homogeneity of feeding unreliable.

Although pumps with variable delivery rates (i.e.

pumps with adjustable stroke, bucket wheel or centrifugal pumps of adjustable eccentricity) assure accurate dispensing, they are nevertheless very expensive because they need time-consuming precision machining of parts and so their use has not become widespread.

Feeding devices with ladles are of simple design and are reliable in operation. Their operating principle consists in that ladles mounted on a rotary plate or disc or on a rocker rod arranged inside the supply bin or tank holding the dressing liquid scoop out the liquid in a metered manner. The constant level of the dressing liquid in the supply bin is assured by means of a pump and an overflow pipe.

The only, though important, disadvantage of such arrangements is that the contro of the volume of the liquid scooped out by ladles from the supply bin can be achieved only either by fitting insert pieces into, or by complete exchange of, the ladles, whereby feeding may be carried out only in stages so that a continuous volume-control cannot be achieved.

An aim of the invention is to provide a feeding apparatus which, while maintaining all the advantages of a ladle-type feeding system, offers a simply and quickly settable continuous volume control for liquids.

The invention concerns, therefore, feeding apparatus with continuously variable control of the volume of liquids, mainly liquid dressing agents.

The liquid is filled into the supply bin of the apparatus through an inflow pipe; a constant level of the liquid in the supply bin is assured by means of an overflow pipe. Two rotary or pivotable disks arranged on a common shaft dip into the liquid, one of which is rigidly fixed to the shaft while the other is coaxially slidable on it. At least one ladle-shaped scooping element is mounted on the circumference of the fixed disk.

Inside the slidable disk there is a prism or cylinder coaxial With the feed element, arranged in such a fashion that the effective volume of the feed element can be set by axially shifting the slidable disk on the shaft.

During the rotation or pivoting of the disk the feed element scoops a quantity of liquid which corresponds to its free volume and pours it into an outflow position inside the circular track of the movement of the feed element.

The invention is further described, purely by way of example, with reference to preferred embodiments illustrated in the accompanying drawings, wherein Figure 1 is a schematic partly cross-sectional, partly elevational, view of feeding apparatus according to the invention; Figure 2 shows one of the possible ways of mounting the feeding apparatus according to the invention; while Figure 3 illustrates another embodiment of mounting the feeding apparatus according to the invention.

As shown in Figure 1, a liquid dressing agent is in use filled into a supply bin or tank 1 through a feed pipe 2. An overflow pipe 3 assures a constant level of the liquid dressing agent. A rotary (or rockable) shaft 4 carries a disk 5 that is rigidly secured thereto and a disk 6 that can be displaced, as shown by the double-headed arrow. Prismatic bodies or cylinders 8 arranged on the axially slidable disk 6 move in use inside feed elements 7 arranged on the rigidly fixed disk 5, whereby the quantity of liquid discharged into the outlet trough 9 may be regulated. The effectively dispensed volume of the liquid is controlled by axially shifting the slidable disk 6 on the shaft 4 by means of a control device 10.

An already mentioned, Figure 2 illustrates another embodiment of the feeding apparatus according to the invention, wherein the feeding apparatus 11 according to Figure 1 is connected to an impeller vane-like feeding element 13. The effectively dispensed quantity of liquid can be adjusted relative to the rated volume by means of the prismatic or cylindrical piston 8.

A stream of seed 14 to be wet-dressed actuates the rotary motion of the impeller-like feeding element 13 positioned in the path of the flow of seeds 14.

Should the rate of the flow of seeds 14 change the r.p.m. of the impeller-like of the impeller-like element 13 also changes and the quantity of the liquid dispensed is changed proportionally.

As already mentioned, Figure 3 shows another embodiment of the feeding apparatus according to the invention wherein the shaft 4 of the apparatus according to the invention 11 rotates with constant r.p.m. and a moving element 15 arranged in the flow path of the seeds is set in motion by the variation of quantity of seeds in the flow.

The moving element 15 is connected to a control equipment 10, hence the dispensed quantity of liquid varies proportionally with the variation of the quantity of seeds in the seed-flow.

Claims

1. Feeding apparatus, mainly for admixing liquid dressing agents, comprising a supply container, a feed pipe extending into the supply container, an overflow pipe arranged on the side of the supply container at a suitable height, a rotary or rocking shaft in said container carrying a first, rigidly fixed disk and a second, coaxially slidable disk, at least one feed element arranged on the fixed disk, a (or a respective) prismatic body or a cylinder coaxially arranged within the or each feed element, an open discharge trough disposed within the circular track of movement of the or each feed element and above the position of the overflow pipe, and controlling means for controlling the sliding movement of the axially slidable disk.

2. Apparatus according to claim 1 wherein said shaft is connected via a drive element to a moving part arranged in the flowpath of the seeds to be passed through the apparatus.