Mixing blade with removable wearing element
View Patent ↗The invention relates to a mixing blade ( 6 ) consisting, of a base part ( 15 ) fixable to a shaft and a removable wearable element ( 12 ). The aim of said invention is to develop a more economical mixing blade. For this purpose, the wearable element ( 12 ) and the base part ( 15 ) overlap on at least 30% of the base part length and define different cross-sections of the mixing blade ( 6 ) in said area.
1. A mixing blade ( 6 ) attachable to a rotatable shaft, the shaft having a center-axis, said mixing blade comprising a base part ( 15 ) fixable to the shaft and a removable wearing element ( 12 ), said base part having a base part length, characterized in that the wearing element ( 12 ) and the base part ( 15 ) overlap over at least 30% of the base part length, wherein the mixing blade is rectangular in a top view parallel to the center-axis of the shaft, wherein the base part has a rectangular recess in which the wearing element is inserted, wherein the wearing element has a wearing element length perpendicular to the center-axis of the shaft, and a majority of the wearing element length has a cross section in the shape of a right trapezoid, the cross section being perpendicular to the wearing element length and having an area, and wherein the wearing element has a transition area in which the area of the cross section increases towards the shaft along the wearing element length.
2. Mixing blade according to claim 1 , characterized in that the mixing blade has a leading edge and the wearing element ( 12 ) encompasses at least one third of the leading edge of the mixing blade ( 6 ).
3. Mixing blade according to claim 2 , wherein the wearing element has a top surface and a bottom surface and the mixing blade further comprising a flange projecting from the bottom surface of the wearing element adjacent to the leading edge.
4. Mixing blade according to claim 1 , characterized in that the mixing blade has a leading edge and the wearing element ( 12 ) encompasses at least one half of the leading edge of the mixing blade ( 6 ).
5. Mixing blade according to one of claim 1 , 2 , or 4 characterized in that the wearing element ( 12 ) forms an entire end of the mixing blade ( 6 ) and covers a radial tip of the base part ( 15 ) at least partially.
6. Mixing blade according to one of claim 1 , 2 , or 4 , wherein the base part has a projection in a radial, axial and circumferential direction.
7. Mixing blade according to one of claim 2 or 4 , characterized in that the wearing element ( 12 ) is formed tapered towards the leading edge.
8. Mixing blade according to claim 7 , wherein the cross section is in the shape of a truncated right trapezoid.
9. Mixing blade according to claim 8 , wherein the wearing element has a top surface and a bottom surface and the mixing blade further comprising a flange projecting from the bottom surface of the wearing element adjacent to the leading edge.
10. Mixing blade according to one of claim 1 , 2 , or 4 characterized in that the wearing element is connected via studs ( 14 ) to the base part ( 15 ), which studs extend through holes in the base part ( 15 ) into threaded holes in the wearing element ( 12 ).
11. Mixing blade according to one of claim 1 , 2 , or 4 , characterized in that the wearing element is made of a front edge section ( 12 ) and an end section ( 21 , 26 ).
12. A mixing blade ( 6 ) attachable to a rotatable shaft having a center-axis, said mixing blade comprising a base part ( 15 ) fixable to the shaft and a removable wearing element ( 12 ), said base part having a base part length and said wearing element having a wearing element length perpendicular to the center-axis, characterized in that the wearing element ( 12 ) and the base part ( 15 ) overlap over at least 30% of the base part length, the mixing blade has a mixing blade length and a first cross-section that is perpendicular to the mixing blade length and the mixing blade has a transition area in which the area of the first cross section increases towards the shaft along the mixing blade length, and wherein the wearing element has a second cross-section that is perpendicular to the wearing element length and the area of the second cross-section decreases towards the shaft along the wearing element length.
13. Mixing blade according to claim 12 , characterized in that the mixing blade has a leading edge and the wearing element ( 12 ) encompasses at least one third of the leading edge.
14. Mixing blade according to claim 13 , characterized in that the wearing element ( 12 ) encompasses at least one half of the leading edge of the mixing blade ( 6 ).
15. Mixing blade according to any one of claim 12 , 13 , or 14 , characterized in that the wearing element ( 12 ) forms an entire end of the mixing blade ( 6 ) and covers a radial tip of the base part ( 15 ) at least partially.
16. Mixing blade according to any one of claim 12 , 13 , or 14 , characterized in that the mixing blade is rectangular in a top view parallel to the center-axis of the shaft.
17. Mixing blade according to any one of claim 13 or 14 , characterized in that the wearing element ( 12 ) is formed tapered towards the leading edge.
18. Mixing blade according to any one of claim 12 , 13 , or 14 , characterized in that the first cross-section is in the shape of a right trapezoid over a majority of the wearing element length.
19. Mixing blade according to claim 18 , wherein the first cross-section is in the shape of a truncated right trapezoid.
20. Mixing blade according to any one of claim 12 , 13 , or 14 characterized in that the wearing element is connected via studs ( 14 ) to the base part ( 15 ), which studs extend through holes in the base part ( 15 ) into threaded holes in the wearing element ( 12 ).
21. Mixing blade according to any one of claim 13 or 14 , wherein the wearing element has a top surface and a bottom surface and the mixing blade further comprising a flange projecting from the bottom surface of the wearing element adjacent to the leading edge.