A screw conveyor, in particular as screw conveyor in a pressing screw device for material to be dried, for example moist or wet waste, consists of a shaft that can be supported on bearings rotatably in the pressing screw device, and at least one spiral screw provided on the shaft to convey the mater
A screw conveyor, in particular as screw conveyor in a pressing screw device for material to be dried, for example moist or wet waste, consists of a shaft that can be supported on bearings rotatably in the pressing screw device, and at least one spiral screw provided on the shaft to convey the material to be dried in the pressing screw. The spiral screw is formed of at least two elements, such as, for example, a basic element and at least one cover element, and at least one of the elements of the spiral screw is designed exchangeably and removably, respectively.
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1. A screw conveyor in a pressing screw device for material to be dried consisting of a shaft that can be supported on bearings rotatably in the pressing screw device, and at least one spiral screw provided on the shaft for conveying the material to be dried in the pressing screw device, wherein the
1. A screw conveyor in a pressing screw device for material to be dried consisting of a shaft that can be supported on bearings rotatably in the pressing screw device, and at least one spiral screw provided on the shaft for conveying the material to be dried in the pressing screw device, wherein the spiral screw is formed of at least two elements, including a basic element and at least one cover element for covering the basic element, and at least one of the at least two elements of the spiral screw is configured exchangeably and removably, respectively and a catch in a form of an acute triangle is protruded outwardly from along a connection point between the basic element and a neighboring basic element for receiving the cover element. 2. The screw conveyor according to claim 1, wherein the at least one cover element is designed exchangeably and removably, respectively. 3. The screw conveyor according to claim 1, wherein at least the at least one cover element is designed such that it can be assembled segment-like. 4. The screw conveyor according to claim 1, wherein the at least one cover element covers the basic element at least laterally on one side and at the side facing outwards. 5. The screw conveyor according to claim 1, wherein the basic element is configured as an attachment element and the basic element is configured as the attachment element that can be attached by a welding connection at or on the shaft. 6. The screw conveyor according to claim 1, wherein the basic element can be connected releasably with the shaft. 7. The screw conveyor according to claim 1, wherein the basic element is formed segment-like to arrange it only in sections on the shaft and at the basic element at least one fixing peg is provided. 8. The screw conveyor according to claim 1, wherein the basic element is formed of metal steel sheet or as a cast element. 9. The screw conveyor according to claim 1, wherein the basic element and the at least one cover element have corresponding connection interfaces. 10. The screw conveyor according to claim 1, wherein the basic element and the at least one cover element have corresponding connection interfaces and the connection interface is defined by at least one screw connection with appropriate bore holes in the basic element and the at least one cover element. 11. The screw conveyor according to claim 1, wherein the basic element and the at least one cover element have at least one form-locking connection additionally or alternatively to a connection interface corresponding with each other when built in to form the form-locking connection. 12. The screw conveyor according to claim 1, wherein the basic element and the at least one cover element have at least one form-locking connection and the form-locking connection is defined by hat-shaped elevations on one of the at least two elements and by corresponding recesses on the other of the at least two elements. 13. The screw conveyor according to claim 1, wherein the basic element and the at least one cover element have at least one form-locking connection and the form-locking connection at the basic element is an “U” open on the side pointing outwards or as groove open on top in which a hat-shaped elevation can be put or slid in. 14. The screw conveyor according to claim 1, wherein the basic element and the at least one cover element have at least one form-locking connection and the form-locking connection is defined by a tongue-and-groove-connection, or by pins or bolts. 15. The screw conveyor according to claim 1, wherein at the opposite face of the catch, covered by the at least one cover element when used as intended, a carrier surface is provided on which a segment of the at least one cover element is supported during conveying the material to be pressed. 16. The screw conveyor according to claim 1, wherein at the opposite face of the catch at the basic element, covered by the at least one cover element when used as intended, a carrier surface is provided on which a segment of the at least one cover element is supported during conveying the material to be pressed and the at least one cover element has a further protrusion covering and thus protecting the basic element during the intended use. 17. The screw conveyor according to claim 1, wherein at the at least one cover element on the side opposite the basic element during assembly a shaping is provided tapering towards the shaft. 18. The screw conveyor according to claim 1, wherein at the at least one cover element on the side opposite the basic element during assembly a shaping is provided tapering towards the shaft and the shaping is designed as curvature and is peaked in a conveying direction. 19. A pressing screw device for material to be dried comprising at least one screw conveyor, wherein the screw conveyor consists of a shaft that can be supported on bearings rotatably in the pressing screw device, and at least one spiral screw provided on the shaft for conveying the material to be dried in the pressing screw device, wherein the spiral screw is formed of at least two elements, including a basic element and at least one cover element for covering the basic element, and at least one of the at least two elements of the spiral screw is configured exchangeably and removably, respectively and a catch in a form of an acute triangle is protruded outwardly from along a connection point between the basic element and a neighboring basic element for receiving the cover element. 20. The screw conveyor according to claim 8, wherein the metal steel is a steel sheet.
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