Design of Twin Shaft Horizontal Blade Mixer
Source: internal company
Material mixing refers to the homogenization of one or more materials to reduce the uneven distribution of particle size, density, temperature and plasticity. It is a common material treatment method. Different industries have different mixing equipment due to different types, characteristics, uses and subsequent treatment methods of raw materials. The double-shaft horizontal blade mixer adopts intermittent discharging mode, and its structure adopts two stirring shafts with stirring blades arranged on them. The stirring blades forcibly mix and homogenize the materials during their rotation. The equipment is very suitable for mixing and homogenizing powdery, granular and liquid materials.
1. Structural characteristics
Double-shaft horizontal blade mixer is a forced and intermittent unloading stirring device, which is widely used to stir various powdery or granular materials in building materials, coal chemical industry and chemical fertilizer industry. The mixing device adopts compact design, and the mixer consists of transmission system, mixing cylinder, mixing shaft system, frame and other parts. The stirring cylinder consists of a stirring tank, a lining plate, a hood, etc. The feed port and dust collection port are arranged on the hood, and the discharge door is arranged under the stirring tank. The "" type stirring tank is equipped with two horizontally arranged stirring shafts, the shafts are respectively equipped with stirring arms, the stirring blades are distributed on the stirring arms, and the included angles between the adjacent stirring arms are 45, 60, 90, 120, 135 and 180. The included angle is designed according to different needs. Generally, the included angles of 45 and 60 are for large and extra-large stirring devices. There are many ways to install the blades on the stirring shaft, but they cannot form an inclined device to urge the material to move to one end. Therefore, if each stirring blade is arranged obliquely, the left and right rotation directions of the stirring blades on the two stirring shafts should alternate, which can increase the convection of materials in a local range. The stirring arms near the two ends of the stirring tank are respectively equipped with reverse blades, which are used to clean up the accumulated materials on the end surfaces. The part of the stirring shaft where the stirring arm is installed is tetrahedral design, which is convenient for the circumferential positioning of the stirring arm. The stirring blade and the stirring arm are bolted to facilitate replacement.
2. Problems to be Noticed in Design and Use
2.1 The two stirring shafts shall rotate towards each other, and the rotation of the two shafts shall be synchronized. The input shafts of the two reducers are connected by couplings to mechanically ensure the synchronization of the two shafts.
2.2 The discharge door is located at the lower part of the stirring tank and has a large door opening structure, which is convenient for rapid discharge of materials. The discharge door is driven by hydraulic unit with compact rhythm and can be opened manually. Adjusting the limit switch can control the opening and closing degree of the discharge door.
2.3 In order to solve the problem of material sticking to the shaft, in practical application, a metal ring can be added between the adjacent two stirring blades. The metal ring scatters the materials adhering to the shaft during rotation, thus effectively avoiding the occurrence of material sticking to the shaft.