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Changzhou Xianzhu Drying Equipment Co., Ltd
Identification and solution sharing of common problems in twin-screw cone mixer
Date: 2025-10-09Read: 6
The twin-screw cone mixer utilizes a conical cylinder and a double helix asymmetric rotor structure to achieve three-dimensional cyclic motion of materials, and is widely used in industries such as pharmaceuticals, food, chemicals, and new materials. It is particularly suitable for uniformly mixing powders with large differences in fluidity, density, and easy stratification. Its operation relies on mechanical transmission, precise clearance control, and material characteristics matching. However, in long-term use, uneven mixing, difficult discharge, or equipment failure may occur due to material adhesion, mechanical wear, improper operation, and other issues. Mastering the identification and solution methods of common problems in twin-screw cone mixer is the key to ensuring its continuous and efficient mixing.
Problem 1: Uneven mixing or prolonged cycle
Improper feeding sequence:
The principle of "large before small, dry before wet" should be followed, with the main ingredients added first, trace components added and pre dispersed;
Avoid adding too much material at once, which may affect the efficiency of spiral propulsion.
High filling rate:
The effective volume of a conical cylinder is usually 60% to 80% of the total volume, and overloading can cause poor material flipping;
Reduce the feeding amount to ensure sufficient space for material circulation.
Speed mismatch:
The improper ratio of internal and external spiral speeds affects the mixing efficiency, and the parameters of the frequency converter should be adjusted according to the material characteristics;
Viscous materials can be slowed down appropriately to prevent wall sticking.
Problem 2: Poor discharge or large residual amount
Discharge valve malfunction:
Check whether the pneumatic or manual discharge valve is fully opened and whether the sealing components are aged or stuck;
Clean the clumps or accumulated materials inside the valve body.
Moisture absorption and agglomeration of materials:
Materials with strong moisture absorption properties (such as starch and certain APIs) should be operated in a dry environment, and dry air should be introduced if necessary;
Timely discharge after mixing to avoid prolonged residence.
Design defects of cone bottom:
Old models with too small cone angles are prone to material accumulation, and can be equipped with vibrators or air hammers to assist with cutting.
Question 3: Equipment vibration or abnormal noise
Mechanical looseness:
Check if the anchor bolts and transmission components (couplings, bearing seats) are loose, and tighten them again;
Regularly check the lubricating oil level and quality of the gearbox.
Spiral scraping cylinder wall:
Bearing wear causes the spiral to sink, resulting in reduced clearance or even friction with the cylinder;
Stop the machine to check the bearings, adjust or replace them.
Materials mixed with hard objects:
Metal foreign objects or lumps that have not been cleared and collide with the spiral should be screened before feeding.
Question 4: Sealing leakage (dust or lubricating oil)
Main shaft seal failure:
Aging of packing seals or mechanical seals leads to dust overflow or lubricating oil infiltration into materials;
Regularly inspect and replace seals to ensure sterile or clean production requirements.
Powder leakage at the connection of the cylinder:
Check if the flange sealing ring is damaged and tighten the connecting bolts.