Mixer having rotating mixing container
View Patent ↗The present invention relates to a mixer with a mixing container and a tool shaft ( 8 ) which is arranged at least partly in the mixing container and has a drive end and a working end for a working tool ( 6 ), the tool shaft ( 8 ) being mounted on the drive end by means of two mutually set-apart tool bearings and a drive motor ( 7 ) being provided for the tool shaft ( 8 ). In order to provide a mixer which is simple and economical to manufacture and has as few movable and wearing parts as possible and the tool shaft ( 8 ) of which is, in addition, able to accommodate the considerable transverse forces occurring during operation, the invention proposes that the drive motor ( 7 ) have a motor shaft which is mounted, at least on one side, by a tool bearing.
1. A mixer with a mixing container and a tool shaft ( 8 ) arranged at least partly in the mixing container, the tool shaft having a working end to which a working tool ( 6 ) is fastened or can be fastened and a drive end which is mounted by means of two mutually set-apart tool bearings, a drive motor ( 7 ) being provided with a motor shaft ( 21 ) for driving the tool shaft ( 8 ), wherein the motor shaft ( 21 ) is mounted by at least one of the two mutually set-apart tool bearings, and wherein one of the bearings, is a combined radial axial bearing (radiax bearing) ( 19 ).
2. The mixer according to claim 1 , wherein the motor is arranged between the two tool bearings and the motor shaft ( 21 ) is mounted by means of the two tool bearings, so that the tool shaft also serves as the motor shaft.
3. The mixer according to claim 1 or 2 , wherein the motor is a direct drive, three-phase synchronous motor.
4. The mixer according to claim 2 , wherein the diameter of the motor shaft ( 21 ) differs on the two tool bearings.
5. The mixer according to one of claims 1 to 2 , wherein the motor is arranged in a motor housing ( 16 ), both tool bearings being arranged on or in the motor housing ( 16 ).
6. The mixer according to claim 5 , wherein the motor housing ( 16 ) has a first outer flange ( 13 ) and the mixer has a mixer housing ( 2 ) in which the mixing container ( 3 ) is arranged, the outer flange being fastened to the mixer housing.
7. The mixer according to claim 6 , wherein the motor housing ( 16 ) has a second outer flange ( 17 ) which is also fastened to the mixer housing, the second outer flange ( 17 ) having a larger average diameter than the first outer flange ( 13 ).
8. The mixer according to claim 7 , wherein the mixer housing has a stepped through-opening with a first portion having a smaller average diameter and a second portion having a larger average diameter, the second portion having an average diameter which is larger than the average diameter of the first outer flange ( 13 ) and is smaller than the average diameter of the second outer flange ( 17 ).
9. The mixer according to claim 8 , wherein said first portion of said stepped through-opening has a smallest diameter and the smallest diameter is larger than the largest external diameter of the working tool ( 6 ).
10. The mixer according to one of claims 1 to 2 , wherein the tool shaft ( 8 ) has two portions which are detachably fastened to each other, one of the portions being formed in one piece with the motor shaft ( 21 ).
11. The mixer according to one of claims 1 to 2 , characterized in that the tool shaft ( 8 ) and the motor shaft ( 21 ) are formed in one piece.
12. The mixer according to claim 3 , wherein the motor is any one of a torque motor, a servo motor and a reluctance motor.
13. The mixer of claim 1 , wherein one of the bearings is arranged closer to the working end of the tool shaft.
14. The mixer of claim 4 , wherein the two tool bearings include a tool bearing ( 18 ) facing the mixing container ( 3 ) and a tool bearing ( 19 ) remote from the mixing container ( 3 ), and wherein the diameter of the motor shaft ( 21 ) on the tool bearing remote from the mixing container ( 3 ) is the smaller diameter.
15. The mixer of claim 14 , wherein the diameter of the motor shaft ( 21 ) on the tool bearing ( 19 ) remote from the mixing container ( 3 ) is at least 30% smaller than the diameter of the motor shaft ( 21 ) on the tool bearing ( 18 ) facing the mixing container ( 3 ).
16. The mixer of claim 14 , wherein the diameter of the motor shaft ( 21 ) on the tool bearing ( 19 ) remote from the mixing container ( 3 ) is at least 50% smaller than the diameter of the motor shaft ( 21 ) on the tool bearing ( 18 ) facing the mixing container ( 3 ).
17. The mixer of claim 6 , wherein the mixer housing ( 2 ) is provided with a housing cover ( 5 ), and wherein the outer flange is fastened to the housing cover ( 5 ).
18. The mixer of any one of claims 1 - 2 , wherein one of the bearings is a twin-row self-aligning bearing.
19. The mixer of any one of claim 1 - 2 , wherein the combined radial axial bearing is any one of a self-aligning roller bearing and a self-aligning ball bearing.