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Construction principle of air conveying chute


Release time:

Jan 14,2022

The air conveying chute is a conveying device that uses air to make solid particles flow down the chute in a fluidized state. This mode of transportation belongs to gas-solid dense phase transportation, which is widely used in building materials, chemical industry, light industry and other departments.

  Air delivery chuteIt is a conveying device that uses air to make solid particles flow down the chute in a fluidized state. This mode of transportation belongs to gas-solid dense phase transportation, which is widely used in building materials, chemical industry, light industry and other departments.

The tank body is composed of an upper groove and a lower groove, separated by a breathable layer. The trough is inclined downward by 4% to 6% in the conveying direction. Materials are continuously added to the breathable layer of the chute through the high-end discharge pipe of the chute, and air is sent into the lower chute through the fan.

When the air passes through the breathable layer and the material, the material is fluidized, and under the action of its own weight component, it flows down along the groove on the breathable layer and is discharged from the discharge port 7. The air escaping from the material layer is discharged into the atmosphere through the filter layer at the top of the upper tank, or enters the dust removal equipment through the exhaust pipe.

The tank body is made of steel plate with a thickness of 2~4mm. The main dimensions of the groove are groove width (B), upper groove height (h), lower groove height (a), and single groove length (l). The specifications of the air conveying chute are expressed in terms of slot width (B) mm, and the main specifications are 250, 400, 500 and 600. since the upper tank is the channel for materials and air, and the lower tank is only breathable, the upper tank is higher and the lower tank is shorter, generally H-0.5 ~ 0.8B, N-50 ~ 100mm, and the standard length of each tank is 2000mm, in addition, non-standard tank body can be made in multiples of 250ram. Each section of the groove is flanged. In order to meet the requirements of the transportation route and the unloading point, the chute has a shunt branch, and a curved groove can be installed at the shunt position, and a three-way groove or a four-way groove can be installed at the branch position. In order to facilitate the observation of material flow, a peep hole was opened in the upper tank. Sometimes, only a portion of the chute is needed to transport the material. In order to save air, a wind deflector can be installed in the lower chute to cut off the air to the part of the chute that does not transport materials.

The breathable layer is a means for supporting the material, allowing air to uniformly penetrate and fluidize the material. Therefore, the pores of the breathable layer should be dense, uniform and continuous, so that the material can be uniformly fluidized and avoid eddy current. The surface of the breathable layer should be smooth, with a certain degree of moisture resistance, heat resistance and mechanical strength. Commonly used breathable layers include ceramic porous plates, cement porous plates, and fiber fabrics. At present, chemical fiber fabric is often used to make the breathable layer. In order to reduce the impact and wear of the added material on the breathable layer, the breathable layer is covered with a 1.5m long steel plate. In order to prevent rainwater from penetrating into the joint of the upper and lower tanks, the upper tank is provided with a waterproof edge. In order to prevent rainwater from penetrating into the joint of the tank body, an angle steel waterproof cover is provided. When assembling, the breathable layer should be tightened, and its length and width should have appropriate allowances.

The air delivery chute is supported by several chute racks. In order to make the tank on the tank frame with the change of temperature and free expansion, the flexible installation method is used. The slot spacing is generally about 4m, and the slot flanges should be staggered by a certain distance to avoid affecting the slot expansion.