Air jigging machine having a pressure measuring device

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.