Biomass particle forming mechanism with spiral groove press rollers

Abstract

The invention discloses a biomass particle forming mechanism with spiral groove press rollers. Press roller assemblies are vertically mounted in a forming cavity, a wedge-shaped compression area is formed by the outer work surfaces of the press rollers and the inner surface of a circular mould, and press roller shaft sets, mounting holes in an upper cover plate and mounting holes in a lower cover plate are matched to form an eccentric structure. The press roller assemblies are connected through clearance adjusting and locating assemblies. Outer cylindrical surfaces extruded by press roller shafts and the circular mould are provided with a plurality of spiral grooves distributed in the axial direction, and the structure that the grooves and convex edges are evenly and alternately distributed in the extrusion acting faces of the press rollers in the circumferential direction is formed. According to the biomass particle forming mechanism, an effective material compression cavity is enlarged, the compression efficiency is improved, and running is stable during work. The uniformity of materials distributed in the axial direction of the press rollers is improved. The service life is prolonged, the mould-roller clearance is adjusted conveniently, adjusting precision is high, the uniformity of the materials distributed in the axial direction of the press rollers is improved, and the compression process is stable.

Description

technical field [0001] The invention relates to the field of biomass particle forming equipment, in particular to a biomass particle forming mechanism with a spiral groove pressure roller. Background technique [0002] Biomass pellet fuel is mechanically pressed from sawdust and crop straw. The existing ring mold pressure roller pellet molding machine uses the relative movement of the ring mold and pressure roller to squeeze and shape the material entering the wedge-shaped compression zone between the mold and roller. It has the advantages of high molding rate and continuous production, and is widely used. However, the consistency of the mold roller gap is poor, and because the pressure roller bearing is in the material forming cavity, its structural size is limited. When the extrusion force is too large, the strength of the pressure roller shaft is insufficient, the bearing life is very short, and the equipment repair and maintenance time is too long . At the same time, d...

AI Technical Summary

Problems solved by technology

However, the consistency of the mold roller gap is poor, and because the pressure roller bearing is in the material forming cavity, its structural size is limited. When the extrusion force is too large, the strength of the pressure roller shaft is insufficient, the bearing life is very short, and the equipment repair and maintenance time is too long

At the same time, due to the limited feeding space between the ring die and the pressure roller, when the loose biomass material enters the forming cavity in the ring die, material accumulation is likely to occur at the end close to the feed inlet. This uneven material distribution will cause the whole machine to Stuffed cars will also cause uneven wear of the ring die and pressure rollers in the axial direction, which will affect the service life of the molded parts

For the die-roller type pellet forming machine, the gap between the pressure rollers of the ring mold has a great influence on the pellet formation. In order to realize the adjustment of the size of the gap between the two, the pressure roller shaft is mostly made of an eccentric type, that is, the two shaft ends of the pressure roller shaft are coaxial, but Different from the intermediate shaft section supporting the pressure roller, the pressure roller shell is installed on the pressure roller shaft through bearings. Due to the size limitation and structural requirements of the pressure roller shell cavity, the bearing works in the pressure roller shell, and the pressure roller is directly filled with In the molding cavity of biomass materials, dust can easily enter the bearing working cavity, causing the bearing to be stuck, and the rolling friction force of the pressure roller shell rotating around the pressure roller shaft increases sharply, and the pressure roller slips or gets stuck, making the material unable to flow smoothly. enter the compressed area

In addition, in order to increase the driving ability of the pressure roller to the material, grooves parallel to the axis are usually processed on the pressure roller shell, and the grooves and ribs on the pressure roller shell alternately contact the inner surface of the ring die, which is prone to impact loads , will also affect the service life of the die roller

Images