Mixer

The screw belt mixer is equipped with a screw belt inside, which is usually in the shape of a spiral. The ribbon can be a single ribbon or a double ribbon structure. The double helix structure is more common, with one helix being left-handed and the other being right-handed. This design can create complex flow paths for materials in the mixer, promoting thorough mixing of materials.

The height, pitch, and other parameters of the screw will be designed according to the volume and mixing requirements of the mixer. Generally speaking, the gap between the height of the screw belt and the inner wall of the mixer cylinder is small to ensure that it can drive the material close to the cylinder wall for mixing and prevent the material from forming a static layer at the cylinder wall.

The cylinder is a component that accommodates materials and screws, and its shape is mostly cylindrical. The material of the cylinder is selected based on the properties of the mixed material and the working environment. Common materials include stainless steel and carbon steel. Stainless steel cylinder body is suitable for situations with high hygiene requirements and corrosive materials, such as food, pharmaceutical and other industries; Carbon steel cylinder has a lower cost and is suitable for industrial mixing applications where material requirements are not very strict.

The top of the cylinder usually has a feeding port, and the size and position of the feeding port should be convenient for the input of materials. There is a discharge port at the bottom, which can be designed in different forms, such as gate valve discharge port or butterfly valve discharge port, to meet different discharge control requirements.

The transmission device is used to drive the rotation of the screw belt. It includes components such as motors and reducers. The motor provides power, and the reducer converts the high-speed rotation of the motor into the appropriate speed required by the screw. The design of the transmission device should ensure stable power transmission and take into account the operating conditions of the screw belt mixer under different load conditions. Generally speaking, the rotational speed of the screw belt is relatively low, usually within a few tens of revolutions per minute, which helps to avoid excessive crushing of the material or excessive heat generation during the mixing process.

When the screw rotates, it will lift the material upwards along the cylinder wall. For the double screw belt mixer, the synergistic effect of the left-handed and right-handed screw belts enables the material to continuously flip and cross mix during the lifting process. The material lifted to a certain height by the screw belt will fall back to the central and bottom areas of the cylinder under the action of gravity, forming a vertical circulation and mixing of the material.

In addition to its vertical lifting and flipping function, the screw belt also moves the material horizontally. This horizontal displacement allows the materials to mix at different radial positions inside the cylinder, further improving the uniformity of the mixing. Through the continuous rotation of the screw belt, the material undergoes continuous mixing motion in both vertical and horizontal directions. After a certain mixing time, the material can reach a relatively uniform mixing state.

Used for mixing powdered or granular materials such as flour, powdered sugar, milk powder, seasonings, etc. For example, when making pastries, it is necessary to mix various raw materials such as flour, sugar, and baking powder evenly. The screw belt mixer can meet this mixing requirement and avoid excessive squeezing and heating of the materials during the mixing process, protecting the quality of the food ingredients.

The mixing of chemical raw materials such as pigments, coatings, plastic particles, chemical reagents, etc. also often uses screw belt mixers. When producing plastic pellets, it is necessary to mix different colored masterbatch, additives, etc. with the base plastic pellets. The screw belt mixer can achieve efficient and uniform mixing, ensuring consistency in product color and performance.

In the pharmaceutical process, the mixing of raw materials, excipients, etc. is a very important step. The screw belt mixer can meet the strict requirements of the pharmaceutical industry for mixing accuracy and hygiene conditions, ensuring the quality and stability of drugs. For example, when making tablets, mixing drug powder with fillers, lubricants, and other auxiliary materials, a screw belt mixer can evenly distribute each component.