System and method for performing wind cleaning on wood chips

Abstract

The invention discloses a system for performing wind cleaning on wood chips. The system for performing wind cleaning on the wood chips comprises a vibrating screen, a roll screening machine, a plurality of screw conveyors, a plurality of wind cleaning machines, a plurality of air blowers, a plurality of sundry conveyors, a qualified wood chip conveyor, a plurality of draught fans, and a pluralityof cyclone separators. A method for performing wind cleaning on the wood chips comprises the following steps of: 1) inputting mixed large and small wood chips into the vibrating screen and screening;2) inputting the wood chips screened by the vibrating screen into the roll screening machine and further screening; 3) screening by using positive pressure wind through gaps among conveying rolls of the roll screening machine, screening by the wind cleaning machines through negative pressure, and carrying away wood chips with the qualified sizes by the conveyor; and 4) carrying away sundries and dust which are separated by the cyclone separators by the conveyors. The system for performing wind cleaning on the wood chips has a compact structure, can continuously perform wind cleaning on wood chips in a centralized way for multiple times, and is high in efficiency and low in energy consumption; and impurities such as dust, heavy objects, iron blocks and the like can also be removed when thewood chips with qualified sizes are pneumatically separated, the cleaning quality of the wood chips can be improved more efficiently, and the damage to a defibrator is avoided.

Description

technical field [0001] The invention relates to a material preparation system for medium density fiberboard, especially a system for separating oversized wood chips, sand, stone, bark, iron blocks and other sundries contained in cut wood chips, so as to sort out qualified wood chips The system also relates to an air washing method for wood chips, and belongs to the technical field of wood-based panel manufacturing. Background technique [0002] During the processing of medium density fiberboard, the wood must first be chipped by a chipper, and then the large wood chips are separated by screening to remove small stones, iron blocks, sand and stones and other debris, and then the qualified wood chips are transported to the hot mill. Fibers are separated after softening by machine cooking. In the actual use of mixed wood chips, there are many purchased wood chips, and the sundries contained in them must be removed in time before they can be transported to the heat mill to sepa...

AI Technical Summary

Problems solved by technology

In order to prevent the sundries mixed in the wood chips from damaging the heat refiner, the purity of the wood chips is required to be higher and higher. There are usually two different systems and methods for cleaning wood chips: water washing and dry cleaning (air washing). Although water washing has a high cleaning rate , but a large amount of waste water will be generated, and the treatment of these waste water requires a large amount of investment and high cost

Images