US1853763A - Sub-maene - Google Patents

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April 12, 1932- P. A. H. DEMONCEAUX MEANS FOR CONTROLLING THE JIGGING ACTION IN JIGS USED IN COAL OR ORE WASHING Filed April 11, 1930 Patented Apr. 12, 1932 UNITED. STATES PATENT orF-lcn PIERRE ALFRED HENRI DEMONCELAUXQ OF LE PERREUX, FRANCE, ASSIGNOR TO PREPARATION INDUSTRIELLE DES COMBUSTIBLES, SOCIETE ANONYME, OF NOGENT- SUR-MARNE, FRANCE, A CORPORATION OF FRANCE I i I MEANS FOR CONTROLLING THE JIGGING ACTION IN JIGS USED IN COAL OR ORE WASHING Application filed April 11, 1930, Serial No. 443,444, andin France April 13, 1929. v

charge of the heavy material through the filtering bed by either influencing the thickness of the latter or controlling the amount of water fed'under the washing bed.

The thickness ofthe washing bed is controlled by adding or taking away a certain quantity of the heavymaterial (feldspar in the case of coal washing) which provides the said filtering bed.

The filtering bed allows a quantity of heavy material to pass through which is the greater as the bed is thicker.

In' the case of Water control, the amount of water'fed under the washing bed is increased when it is desiredto have a greater amount of heavy material discharged through the filtering bed, as experience has shown that the discharge of such heavy material through the washing bed stops when the feed of water under the same'is cutoff.

These methods of control make it difficult to use an automatic governor by means of which the amount of heavy'materials discharged could be controlled in direct relation to the amount of such materials fed into the washer.

This invention has for its objecta device whereby the operation of filtering bed washers may be controlled automatically by vary- I ing the rate of discharge of the heavy materials through the filtering bed in direct relation to the amount of such heavy materials fed into the washer. r

The device will control the rate of the'said discharge by acting at everypoint'of time for the washing of fine grade coal.

In the drawings Figure 1 is a longitudinal cross sectional view showing an automatic device for the control of the washer.

Figure 2 is an enlarged cross sectional view of the valve (19) shown in Fig.

The jigging action is produced within the washing vat by a piston (not shown in the figure) which is reciprocated within the chamber 2 along the axis AB by means of eccentrics or any other mechanical means of conventional type. 1

The washing chamber 3 consists of a screen 4 which supports a' layer of feldspar 5 of greater or less thickness on which the bed of .material to be'washed is deposited. The material is fed in at 6 at the front of thewasher and moves along in the direction shown by the arrow 7. During such translation and'by the effect of the jigging action it becomes graded and separates into a layer of shale 8 and a layer of coal 9-. i

The hind portion of the washer consists of a crest the top wall 10 of which extends above the boundary between the shale'and coal lay-' ers, to ensure that only the top portion of the coal layer shall be jigged over the edge 11 and into the pure coal trough 12 by the effect of the jigging action, the water flow and the motionof the material in the direction shown by the arrow 7. At each return stroke of the piston, part of the shale 8 will be forced through the layer of feldspar and the screen I and fall to the bottom of the vat 1.

Arranged betwe en'the front portion 6 of the washing bed and the piston chamber 2 is a chamber 13 which extends over the Whole Width of the washer. The said chamber 13 is limited by the wall 14 of the piston room, the walls of the washer and the wall 15.; it is partly closed'at the top by a lid lfiprovided Witha vent 17. Its lower end hasfree communication through the orifice 18 with the vat ofthe washer in which the igging action takes place. v

The vent 17 is connected to a valve 19 by which-the communication from the chamber.

13 to the atmosphere may be controlled. For

this purpose, the body of the valve is'formed with a'bore 20 (see Fig. 2) in which a sleeve 21 isrockably fitted. The sleeve 21 isformed with a port 22 arranged in such manner that as the same is brought into registering relation to the passage 23 the chamber 13 will have communication to the atmosphere.

In order to provide for the automatic control of the discharge of the heavy materials in direct relation to the weight of the washing bed, a suitably shaped that 24 is embedded within the stratified layers 8 and 9 of the washing bed. The float 24: will assume a po-- sition of equilibrium which is dependent on the relative thicknesses of the beds 8 and 9 which, as a whole, remain of constant thickness. When the thickness of the bed 8 increases, the fioat 24 will be raised; on the contrary, the float will sink as the layer thins away.

It will thus be appreciated that the motion of a suitably designed float will be directly related to the amount of shale to be discharged. It is only necessary to transmit such motion to the sleeve of the valve 19.

This result is attained, as shown in the figure, by means of a series of levers 25 and 26 connected to the float and swingably mounted on a pin 27 keyed on the latter is a toothed quadrant 28 which meshes with a gear wheel 29 keyed on the pin of the sleeve 21.

The arrangement being such, the device operates as follows: When the raw material or the shale therein fed in at 6 increases, the

greater resistance is opposed by the washing bed to the jigging action upwards.

At that time, the float will be driven upwards and this ascending movement results in reducing the aperture through which the chamber 13 communicates with the atmosphere, whereby the air in the top portion of the chamber 13 is compressed; such air cushion then opposes the jigging up of the water in the chamber 13. The water forced down by the piston and which cannot move within the chamber 13 must flow through the washing bed, whereby the jigging action through the said washing bed is strengthened; this results in the obtainment of a better grading of the raw materials and an increase in the amount of graded materials discharged through the feldspar layer and the screen.

Conversely, when the feed of material to be washed decreases, the beds of shale and coal become thinner and, should the jigging action remain constant, then there would be danger of the coal being discharged through the feldspar bed after the shale bed is completely exhausted.

At that time, the float will sink, which results in opening the communication between the atmosphere and the chamber 13. As the air in the top of the chamber can freely escape into the atmosphere, the water column in the chamber will now oppose to the jigging effeet a less resistance than the washing bed, and an increased amount of the forced down water will be jigged up into the chamber 13 instead of through the washing bed. This immediately results in amuch milder jigging action and, consequently, a decrease in the amount of shale discharged through the bed of feldspar.

The apparatus will advisably be complemented with a cut-oif valve 30 connected between the throttling valve 19 and the orifice 17 of the chamber 13.

When for any reason it is necessary to take down the valve 19, operating the cut-0E valve 30 will avoid the washer being put out and carrying in its upper portion a valve communicating with the atmosphere, and means for automatically closing the valve when the depth of the material being washed is'in creased and for opening the valve when this depth is decreased.

2. In a filtering vat, a tank containing a fluid, permeable means for supporting the material to be worked upon thereabove, means for intermittently applying pressure to the fluid in said tank to force the same through '9 said permeable means and the material thereabove, an air chamber communicating directly with the fluid in said tank, a valve in said air chamber for the inlet and outlet of air, and means for varying the operative position of said valve in accordance with the depth of the material worked upon.

3. In a filtering vat, a tank containinga fluid, permeable means on which the material to be worked upon is positioned, means for 1 intermittently placing said fluid under pressure, an air tank communicating with the fluid in said tank, a valve communicating with the atmosphere positioned in said air tank, and a float positioned in said material for movements in response to the depth thereof for moving said valve to the open position upon decreases in said depth and to the closed position upon increases in said depth.

In testimony whereof, I affix my signature.

PIERRE ALFRED HENRI DEMONCEAUX.

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