AIR JIGGING MACHINE HAVING A PRESSURE MEASURING DEVICE

Abstract

The present invention relates to an air jigging machine for the dry processing of raw materials, particularly coal, comprising at least one material feeding device (1), at least one jigging material carrier (2), which is provided with openings, an air funnel (3), which is arranged below the jigging material carrier (2) and by means of which an air flow can be fed as working air (4) to the jigging material carrier, which working air is composed of a partial flow constantly flowing through the jigging material carrier (2) and a pulsing partial flow superposed thereon, such that the working air (4) can flow through the material fed onto the jigging material carrier (2) and said material can be stratified into a heavy material layer (5) acting as a jig bed and into a light material layer (6) lying thereon, and a discharge device (7) for the heavy material and light material stratified on the jigging material carrier (2) during the jigging process.

Claims

1. An air jigging machine for the dry processing of raw materials, particularly coal, comprising at least one material feeding device (1), at least one jigging material carrier (2) that is provided with openings, an air funnel (3) that is arranged underneath the jigging material carrier (2) and by means of which an air flow can be fed to the jigging material carrier as working air (4), which is composed of a constant partial flow and a superimposed pulsating partial flow, such that the working air (4) can flow through the material fed onto the jigging material carrier (2) and said material can be stratified into a heavy material layer (5) acting as a jig bed and a light material layer (6) lying thereon, as well as a discharge device (7) for the heavy material and light material stratified on the jigging material carrier (2) during the jigging process, characterized in that a pressure measuring device (8) for determining the pressure differential between the pressure in the air funnel (3) and the surroundings is arranged upstream to the jigging material carrier (2), and in that a control unit for adjusting the material throughput is provided, wherein the measured pressure differential is used for adjusting the material throughput.

2. The air jigging machine according to claim 1, wherein the discharge device (7) has a discharge adjusting device (9) for the heavy material and the discharge adjusting device (9) is adjusted in dependence on the measured pressure differential.

3. The air jigging machine according to claim 1, wherein the material feeding device (1) has an infeed adjusting device (10) and the infeed adjusting device (10) is adjusted in dependence on the measured pressure differential.

4. The air jigging machine according to claim 1, wherein a fan (11) and/or a valve (12) for adjusting the air flow is connected to the air funnel, and wherein the fan (11) and/or the valve (12) is adjusted in dependence on the measured pressure differential.

5. The air jigging machine according to claim 1, wherein the jigging material carrier (2) can be subjected to vibrations by means of an associated drive.

6. A method for operating an air jigging machine, particularly according to one of the preceding claims, comprising at least the following steps: feeding material comprising light material and heavy material onto at least one jigging material carrier (2) that is provided with openings, causing an air flow to flow through the material fed onto the jigging material carrier (2) as working air (4), which is composed of a constant partial flow and a superimposed pulsating partial flow, such that the supplied material is stratified into a heavy material layer (5) acting as a jig bed and a light material layer (6) lying thereon, and discharging the stratified heavy material and the stratified light material, characterized in that a pressure is determined upstream to the jigging material carrier (2), and in that the infeed and/or the discharge is adjusted in dependence on the determined pressure.

7. The method according to claim 6, wherein a discharge adjusting device (9) for the heavy material is adjusted in dependence on the measured pressure.

8. The method according to claim 6, wherein an infeed adjusting device (10) is adjusted in dependence on the measured pressure.

9. The method according to claim 6, wherein a fan (11) and/or a valve (12) is adjusted in dependence on the measured pressure.

10. The method according to claim 6, wherein the measured pressure is used for calibrating the air flow in that the air flow is changed between a minimal air flow and a maximal air flow while the jigging material carrier (2) is completely filled and the thusly measured pressure is used for adjusting an operating point of the working air.

Description

[0016] The invention and the technical background are described in an exemplary manner below with reference to the exemplary embodiment schematically illustrated in the FIGURE.

[0017] The air jigging machine illustrated in the FIGURE comprises a material feeding device 1 with an infeed adjusting device 10 in the form of a rotary valve, by means of which the material being introduced into the material feeding device is fed to a jigging material carrier 2. The jigging material carrier 2 is arranged in an inclined manner and has multiple openings such that working air 4 can flow through the jigging material carrier 2 from below. A fan 11 and a valve 12 arranged downstream of the fan 11 serve for introducing the working air into an air funnel 3. In this case, the working air being supplied via the air funnel 3 arranged underneath the jigging material carrier 2 is composed of a constant partial flow and a superimposed pulsating partial flow. During the operation, this working air causes the material on the jigging material carrier 2 to be stratified into a lower heavy material layer 5 and an upper light material layer 6.

[0018] A discharge device 7 is arranged at the end of the jigging material carrier 2 and has a heavy material shaft 14, as well as a light material overflow 13 arranged at the end of the jigging material carrier 2 above the heavy material shaft 14. A discharge adjusting device 9 in the form of a rotary valve is arranged in the heavy material shaft 14 in order to adjust the discharge rate of the heavy material.

[0019] It is proposed to arrange a pressure measuring device 8 within the air funnel 3 underneath the jigging material carrier 2 in order to measure the pressure underneath the jigging material carrier 2. It was found that the measured pressure increases proportionally to the height of the heavy material layer 5 such that the height of the heavy material layer 5 can be determined based on the measured pressure and this value can also be used for adjusting the discharge adjusting device 9 in the course of a control process.

LIST OF REFERENCE SYMBOLS

[0020] 1 Material feeding device [0021] 2 Jigging material carrier [0022] 3 Air funnel [0023] 4 Working air [0024] 5 Heavy material layer [0025] 6 Light material layer [0026] 7 Discharge device [0027] 8 Pressure measuring device [0028] 9 Discharge adjusting device [0029] 10 Infeed adjusting device [0030] 11 Fan [0031] 12 Valve [0032] 13 Light material overflow [0033] 14 Heavy material shaft