Mixing container problem
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The crystallization mixing container (as shown in the picture) has been put into production for nearly a year. The frame mixing shaft has fallen downwards and the mechanical seal has been strained. The diameter of the container is 4000 and the tangent length of the cylinder is 4000. There is a stabilizing device in the middle of the mixing shaft. The lower mixing shaft is hollow and the upper mixing shaft is solid. The coupling is equipped with a stop screw. Please analyze the reason for this phenomenon. Thanks
Is there something wrong with the rack? The commonly used racks we use include DJ and SJ types. Is the round nut loose? If there is obvious drop, you can check the couplings in the frame and equipment. The equipment and mixing paddle are so big, the anti-sway is set in the middle and upper part, and the frame also has a single fulcrum. Will it leak during use? The biggest problem with the mechanical seal reactor we originally designed was that it could not seal properly, because there was no condition to perform a balance test on the stirring paddle. In actual use, the stirring shaft was eccentric, which wore out the mechanical seal and caused leakage. ； The final solution is to add an anti-sway frame at the bottom of the lower mixing shaft and use a double-fulcrum frame, which has a much better effect.
What is the mixing line speed of such a large container? It is difficult to balance the frame mixer, and there will be many problems if the line speed exceeds the standard. It is recommended to use other types of crystallizer mixers.
This has been put into production. The user requested the frame type. The same one has been made before, with a diameter of 3600 and the structure is exactly the same, but there is no problem.
These are all hard-connected. You should see if they fall. Check to see if the threads of the upper shaft and coupling are loose.
Are the length of the mixing shaft and the radius of the frame mixing appropriate? Also, what level is the motor and the stirring speed? It is recommended to change the single pivot point to a double pivot point frame and add a graphite or PTFE support sleeve at the end of the shaft.
This post was last edited by zjq1962 on 2019-1-7 12:40. If the mixing shaft falls, the reason may be the upper round nut. The bottom of the frame mixer is not suitable for adding a bottom bearing. The function of the bottom bearing is also to prevent the radial swing of the shaft end, which cannot solve the fundamental problem. The fulcrum of the frame also increases radial support and has no axial restrictions.