Обзор: Double shaft mixer is a device that uses two parallel mixing shafts to forcefully mix, stir or homogenize materials through the rotation of blades. Its core feature is that the twin shafts rotate synchronously in opposite directions, and the shearing, squeezing and throwing effects of the blades can achieve efficient mixing of materials. Это широко используется в строительных материалах (such as concrete, раствор), химическая промышленность, металлургия, защита окружающей среды (sludge treatment) and food processing, and is a powerful оправдательное оборудование.

Know more about double shaft mixer

What is a double shaft mixer? A double shaft mixer is a machine that uses a motor to drive the shaft paddle for stirring. It is widely used as the core equipment of concrete mixing plants and is used to evenly humidify dry ash powder and other materials.

Twin-shaft mixer uses the synchronous rotation of two symmetrical spiral shafts to add water and stir while conveying dry ash and other powder materials, and evenly humidifies dry ash powder materials, so that the humidified materials do not emit dry ash or water droplets, so as to facilitate the loading and transportation of humidified ash or transfer to other conveying equipment. It is mainly suitable for humidifying and loading fly ash or similar materials in thermal power plants, mines and other industries.

8 structures of double shaft mixer

What does a double shaft mixer consist of?

1. Mixing drum
2. Mixing shaft
3. Mixing blades
4. Casing
5. Устройство передачи
6. Liner device
7. Discharge door device
8. Shaft end sealing device

1. Mixing drum

The mixing drum is the main frame of the double shaft mixer, which is used to contain and mix various materials, такие как цемент, песок и гравий. It is made of wide and thick high-quality steel plates, with strong yield force and sufficient rigidity to ensure the parallelism and concentricity of the mixing shaft.

The mixing drum is usually designed as a ω-shaped double barrel structure, which can withstand large mixing forces under the support of a specially designed frame. The drum is equipped with an observation window, a discharge door, a safety switch and various feed ports for easy operation and maintenance.

2. Mixing shaft

The double shaft mixer has two parallel mixing shafts, which are the core components. The mixing shaft is usually made of high-quality alloy steel, and after a special heat treatment process, it has high strength and good wear resistance.

The two mixing shafts are synchronized and rotated in opposite directions through a gear transmission device. On the shaft, there are evenly distributed mixing blades of various shapes, the most common of which are paddle type and spiral type. Paddle blades can quickly break up materials, while spiral blades help to transport and mix materials in the axial direction. The two work together to form a complex motion trajectory in the mixer and achieve full mixing.

3. Mixing blades

The design and installation method of the mixing blades directly affect the mixing effect. Форма, angle and spacing of the blades are carefully calculated. In terms of shape, in addition to the paddle and spiral blades mentioned above, there are also some specially designed blades that can be mixed according to different material characteristics. The blade angle will be adjusted according to the fluidity and mixing requirements of the material.

Например, for materials with good fluidity, the blade angle can be smaller, so that the material is mixed more in the horizontal direction; for materials with high viscosity, the blade angle is larger, which is convenient for turning the material from the bottom up. The blade spacing is also critical. The appropriate spacing can ensure that the material is fully mixed without excessive accumulation of the material during the mixing process.

4. Casing

The casing is the outer shell of the twin-shaft mixer, which plays a role in protecting the internal components and accommodating the material. The casing is generally welded with thick steel plates and has sufficient strength and sealing. At the top of the casing, there is a feed port to facilitate the entry of materials into the mixer. The size and shape of the feed port are designed according to the feeding method and flow rate of the material.

At the bottom of the casing, there is a discharge port, which is usually equipped with a valve to control the discharge speed and time of the material. Some linings will be set inside the casing as needed. These linings are generally made of wear-resistant materials, такие как марганцевая сталь, to reduce the wear of the material on the casing and extend the service life of the equipment.

5. Устройство передачи

The transmission device is responsible for transmitting power to the mixing shaft. It is generally composed of a motor, редуктор, and a coupling. The motor provides initial power, and the reducer reduces the high speed of the motor to a suitable mixing speed according to the working requirements of the mixer, and at the same time increases the torque.

The coupling is used to connect the output shaft of the reducer and the mixing shaft to ensure smooth power transmission and reduce vibration and impact. The design of the transmission device must ensure high transmission efficiency, стабильная операция, and easy maintenance and repair.

6. Liner device

The liner is installed on the inner wall of the mixing drum, mainly for wear protection and to extend the service life of the mixing drum. The liner is usually made of high-strength wear-resistant material and is bolted to the inner wall of the mixing drum for easy replacement and maintenance.

7. Discharge door device

The discharge door is used to discharge the mixed concrete from the mixing drum. The discharge door is usually hydraulically or pneumatically controlled to achieve fast and reliable discharge operation.

8. Shaft end sealing device

The shaft end sealing device is used to prevent material leakage and external impurities from entering the mixing drum to ensure the normal operation of the mixer. The design usually adopts advanced sealing technology, which can effectively prevent material leakage and ensure the flexible rotation of the mixing shaft.

Working principle of twin-shaft mixer

The double shaft mixer is a commonly used mixing equipment, and its working principle is mainly realized by the rotation of the twin shafts and the movement of the mixing blades. The specific working principle is as follows:

1. Twin-shaft rotation: The twin-shaft mixer is usually composed of two parallel shafts with mixing blades installed on the shafts. Driven by an electric motor or other power device, the twin shafts begin to rotate at a preset speed.

2. Movement of mixing blades: As the shafts rotate, the mixing blades on the twin shafts also begin to move in an arc or spiral shape. This blade design enables it to effectively push the material in different directions and form a flow state.

3. Material mixing: The material is usually located in the mixing chamber of the twin-shaft mixer. As the twin shafts and mixing blades rotate and move, the material is quickly stirred, cut, thrown and mixed.

4. Improve material uniformity: The mixing blades of the twin-shaft mixer continuously push the material from the top to the bottom during movement, and flip the material at the bottom upward, so that the material can be fully mixed and exchanged, improving the uniformity of the material.

5. Circular stirring: The twin-shaft mixer usually adopts the method of circular stirring, то есть, after a period of stirring, the stirred materials are discharged and new materials are added for the next round of stirring.

The twin-shaft mixer continuously shears, mixes, pushes and throws the materials through the rotation of the shaft and the movement of the stirring blades, thereby achieving the stirring and uniformity improvement of the materials.

What are the two types of mixers?

There are two common types of mixers, forced twin-shaft mixers and single-shaft mixers.

Тип 1: Forced twin-shaft mixer

The forced twin-shaft mixer is a high-efficiency mixing equipment widely used in concrete mixing plants. The forced twin-shaft mixer is a device that forces materials to be mixed through two parallel horizontal shafts and the mixing blades on them. It uses the shearing, flipping and mixing effects of the mixing blades to achieve uniform mixing of materials in the mixing drum. This mixer is particularly suitable for concrete production and can ensure the uniformity and quality stability of concrete.

Тип 2: Single-shaft mixer

The single-shaft mixer is a common forced mixing equipment, mainly used for mixing concrete, mortar and other materials. The single-shaft mixer is a device that forces materials to be mixed through a single horizontal shaft and the mixing blades on it. The mixing shaft is usually equipped with spiral blades or shovels, which drive the materials to mix by rotation.