Device to produce briquettes

Abstract

The subject of the invention is a method for the manufacture of briquettes from comminuted straw, as well as a device to manufacture briquettes from comminuted straw. The method consists in that comminuted straw is compressed in a continuous process using a screw-type extruder until the material reaches a temperature at which the material after pressing solidifies to a density exceeding 1.3 g/cm 3. The device has a screw ( 3 ) composed of three segments of decreasing helix pitches toward the outlet. The forming die ( 8 ) is housed in a tank ( 11 ) connected through a water system ( 12 ) to a cooler ( 13 ). The cooling system has a temperature sensor ( 17 ) installed, said sensor being part of the pump supply circuit ( 15 ).

What is claimed is: 
     
         1 . A device for the manufacture of briquettes from comminuted straw, having a screw supported on bearings at its base, composed of segments of different helix pitches disposed in a barrel ended with a forming die, downstream which die a guide is disposed, and above the barrel there is a raw material hopper, characterized in that the screw ( 3 ) consists of three segments of decreasing helix pitches toward the outlet, while the forming die ( 8 ) is housed in a tank ( 11 ) connected through a water system ( 12 ) to a cooler ( 13 ) which has a fan ( 14 ), and a chute ( 18 ) at barrel ( 1 ) is connected with a hopper ( 19 ) inside which there is a screw feeder ( 20 ) driven by a motor ( 21 ), and on an inclined wall of the hopper ( 19 ) a rotary scraper ( 22 ) is mounted whose arm ends mate the helix of the screw feeder ( 20 ). 
     
     
         2 . The device according to  claim 2 , characterized in that in the tank ( 11 ) there is installed a temperature sensor ( 17 ) which is part of the pump supply circuit ( 15 ) of the water system ( 12 ).