Double Shaft Mixer

A double shaft mixer is a powerful mixing device with two parallel, counter-rotating mixing shafts as its core working components. This equipment employs the principle of double axis counter-spiral mixing, where the synchronous counter-rotation of the two shafts drives the material to tumble and mix in all directions within the tank. double shaft mixers are widely used in industries such as fertilizers, chemicals, feed, building materials, and mining.

The core technology of double shaft mixers has evolved around the concepts of "double axis convection, three-dimensional mixing, and continuous operation." Compared to single-shaft mixers, the double axis design enables three-dimensional convection of materials within the drum, ensuring even distribution of even small amounts of microorganisms (only a few parts per thousand) to every particle of raw material. double shaft mixers increase mixing efficiency by 30%-50%.

System composition and technical architecture

The technical architecture of the double shaft mixer mainly consists of the following layers:

(I) Mixing Execution Layer: Composed of two parallel mixing shafts and helical blades mounted on the shafts. Each shaft is fully welded with helical blades, and the blades on the two shafts face opposite directions. The left- and right-hand helical shafts require high manufacturing precision and excellent process performance.

(II) Power Transmission Layer: Composed of an electric motor, reducer, gears, and sprockets. The gear module is 8, the number of teeth is 60, and the tooth profile angle is 20°; the sprocket pitch is 50.8, and the number of teeth is 25. Both gears and sprockets are protected by protective covers.

(III) Sealing and Protection Layer: The casing is tightly sealed, preventing fly ash from escaping or leaking. The shaft ends use a combination of labyrinth and packing seals, providing a double sealing effect.

(IV) Humidification Control Layer: Composed of stainless steel atomizing cone nozzles and water supply pipelines. The nozzles are arranged axially along the helical shaft direction.

(V) Electrical Control Layer: Composed of an electrical control system and a variable frequency speed control device.

Selection criteria and procurement recommendations

When selecting a twin-shaft mixer, the following key points should be considered:

1. Processing Capacity:Determine the effective volume based on the batch throughput. Common capacities range from 0.5 to 10 cubic meters, corresponding to batch sizes from hundreds of kilograms to several tons.

2.Material Characteristics:High-viscosity and high-fiber materials require a high-power twin-shaft mixer; standard models are suitable for general powders. For materials with high moisture content, pay attention to the configuration of the atomization humidification system.

3. Material Requirements:Select based on the corrosiveness of the material. 304 stainless steel is preferred for fertilizers and the food industry; carbon steel is suitable for general materials. Wear-resistant alloy materials are recommended for the mixing blades.

4. Sealing Performance:Prioritize models with a combination of labyrinth and packing seals at the shaft end. Good sealing prevents dust escape and lubricant contamination of the material.

5. Transmission System:Choose a powerful and stable motor and a precise and reliable reducer; this ensures stable operation of the equipment over long periods.

6. Auxiliary Functions:Optional atomization humidification systems are needed for liquid addition; variable frequency speed control is needed for speed adjustment; jacketed systems are needed for heating or cooling. 7. Check after-sales service: Choose manufacturers with complete qualifications and comprehensive after-sales service.

Troubleshooting and Repair Solutions

Loose blade bolts: Tighten the bolts on the equipment every 24 hours. Tighten each blade bolt.

Bent blade shaft deformation: Replace any bent or deformed blades found during regular inspections. Replace blades immediately if the blade tips are severely worn.

Damaged bearings: Inspect bearing wear and replace damaged bearings promptly. Ensure proper bearing lubrication.

Gear wear: Inspect gear wear, replace damaged gears, and add or change lubricating oil. Readjust the position of the stirring shaft and motor shaft to ensure coaxiality.

Foreign object ingress or material clumping: Stop the machine immediately for inspection or cleaning if blockage or foreign object ingress is detected. Regularly clean clumped material from the bottom of the tank.

Nose blockage: Regularly inspect the nozzles of the atomizing device and unclog or replace nozzles as needed.