The stainless steel three-drive shaftless screw conveyor is a special conveying equipment, specifically designed for long-distance, high-torque and high-output working conditions. By integrating the three core designs of no intermediate shaft anti-tangling, stainless steel corrosion-resistant (based on actual reports) (based on actual reports), and three-point distributed drive, it overcomes the rigidity and torque limitations of ordinary single-drive shaftless machines in long-distance/ heavy-load scenarios.
Basic definitions and structure
Core structure: Composed of three independent motor-reducer drive units, continuous unshiftable stainless steel spiral blades, U-shaped/round stainless steel chambers, wear-resistant (based on actual reports) liners (nylon/PE/ceramic), sealing covers, inlets and outlets, and frames; The three drives are usually arranged in segments along the body (such as the head, middle, and tail points), and are synchronized to protect the helical body from rotating abnormally.
Material: Commonly used 304 stainless steel (general corrosion resistance (based on actual reports)); 316/316L (resistant to strong acids and alkalis / food and medicine); The spiral blades are mostly cold-rolled/welded thick plates, and the tank body is welded from stainless steel plates and undergoes sealing treatment.
Working principle: Three-drive synchronous drive of the spiral blade without shaft is used for rotation. The friction force between the blade and the material, as well as the screw thrust, enable the material to move axially along the tank body; there is no intermediate shaft, avoiding the entanglement of fibers and band-shaped materials; segmented drive significantly reduces the deflection and torsional vibration of the long spiral.
Key performance and advantages
Long-distance conveying, heavy load: The length of a single unit can exceed the conventional limit of non-axial machines (less than 60m), suitable for long-distance transportation of 70m or more, with a conveying capacity of up to 1.8 times; the torque distribution is more uniform, and the start-up shock is small.
Strong anti-tangling and high sealing performance: Axleless design, suitable for sludge, kitchen waste, pulp, and long-fiber materials; fully enclosed structure, no dust or odor leakage, in line with environmental protection and food hygiene standards.
Corrosion-resistant (based on actual reports) (based on actual reports) Easy to clean: The stainless steel material has good acid and alkali resistance and is resistant to salt spray. 316L can be used in marine, chemical, and pharmaceutical applications; the smooth inner wall is easy to be cleaned by CIP and has no hygiene dead corners.
Stable operation, easy maintenance: No bearing suspension, reducing wear-prone parts; The drive unit is modularized, allowing for separate inspection and replacement in case of failure.
Applicable scenarios
Environmental protection water treatment: Long-distance transportation of municipal sludge, desilicated sludge cake, grit, and biochemical residual sludge;
Waste/ Solid Waste: Kitchen waste, incinerator slag, treatment materials for landfill leachate;
Food/ Food: Glue paste, plant fibers, medicinal residue (in compliance with FDA requirements);
Chemical industry: Corrosive salt slurries, acid salts, etc. materials.
Selection and Key Points to Pay Attention To
Drive force synchronization: A variable frequency synchronous control system must be equipped to prevent the speed difference of the three-point drive from causing spiral distortion;
Tilt angle control: The general tilt angle should be ≤ 20°. If the tilt angle is too high, the efficiency will drop sharply and it is prone to backflow.
Backing plate material: Abrasive materials (such as slag) are selected as ceramic/metal-resistant (based on actual reports) or alloy backing plates. Non-elastic materials are selected as PTFE/nylon.
Temperature range: Regular stainless steel is applicable within -20 to 120℃. In high-temperature conditions, a cooling/insulation jacket needs to be equipped.
Explosion-proof (based on actual reports) (based on actual reports) Performance requirements: Explosion-proof (based on actual reports) (based on actual reports) Motors and electrical systems are applied in chemical/dust environments.
