Methods and apparatus for the pneumatic conveying of material
AssigneeWaeschle Maschinenfabrik GmbH
InventorsWolfgang Krambrock, Paul Lubbehusen, Hans-Jurgen Huck
Life of this patent
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Abstract
A method for pneumatically conveying material through a conveyor conduit comprises automatically interposing into the conveying operation cleaning phases in which no material is introduced into the conduit, to remove material previously deposited in the conduit. Apparatus has a timing means which rhythmically interrupts the introduction of material, and the strength of the air flow in the cleaning phases can be greater than that of the air flow during the conveying phases.
Claims12
A method of pnuematic conveying by air flow of material which tends to form deposits on a conveyor conduit wall and, when given amounts of such deposits have been so formed, to peel off the thus formed deposits from the conduit wall with the probability that such peeled off deposits will form a blockage in the conduit, and wherein the deposit and peeling off process possesses a rhythm cycle specific to the material being conveyed, comprising the steps of automatically alternating conveying phases in which the material is introduced into the conveying air flow and conveyed in continuous flow through said conduit, and cleaning phases in which the introduction of material into the air flow is stopped and only air passed through said conduit for completely removing all material in said conduit, including deposited material, for cleaning said conduit before additional material is introduced into said conduit, and further including the step of alternating said conveying and cleaning phases with a rhythm that is substantially more rapid than said rhythm cycle of material deposit and peeling off so as to remove the deposits from the conduit wall before thay build up in size sufficient to peel off and cause blockage.
Apparatus for the pneumatic conveying by air flow of material which tends to form deposits on a conveyor conduit wall and, when given amounts of such deposits have been so formed, to peel off the thus formed deposits from the conduit wall with the probability that such peeled off deposits will form a blockage in the conduit, and wherein the deposit and peeling off process possesses a rhythm cycle specific to the material being conveyed, comprising:
- a conveyor conduit having an input end and a discharge end;
- means for producing an air flow through said conveyor conduit;
- means for introducing material to be conveyed into the input end of said conveyor conduit so as to be conveyed continuously through said conduit by the air flow and discharged through said discharge end of said conduit;
- timing means for rhythmically and automatically controlling the material introducing means for periodically interrupting the introduction of material into said conveyor conduit to thereby produce an alternate succession of conveying phases and conduit cleaning phases of a predetermined phase rhythm, the material in the conduit during the conveying phase, including said deposited material, being completely removed from the conduit during the cleaning phase before additional material is introduced into said conduit;
- said timing means being adjusted so that said rhythm of said conveying and conduit cleaning stages is more rapid then said rhythm cycle of material deposit and peeling off whereby deposits of material are removed by the cleaning phase before they build up in size sufficient to peel off and cause blockage of said conveyor conduit.
Dependencies are inferred from the claim text.