CS204299B1 - Appliance for crushing the bark from the machine wood barking - Google Patents

Description

SUMMARY OF THE INVENTION The invention relates to a plant for crushing waste bark resulting from the mechanical debarking of wood material into smaller parts (0 fraction 0.25-2 cm ² ) for further industrial processing thereof, e.g.

For the crushing of the waste bark, modified metal shredders, hammer mills for shaving shavings and veneer waste, mill machines, agricultural mowers and crushers are used. These devices are mostly single-rotor with direct pouring of the processed material through a hopper into the rotor working space, equipped with sorting screens or a drain hole at the bottom of the rotor case. These devices either do not crush the crust to the desired fraction, or clogging and congestion occurs after a short period of operation. These devices cannot be used for crushing throughout the year, when the properties of the processed raw material (bark), ie moisture, content of essential oils and resins, toughness, etc. often change.

The requirements for bark crushing over the entire period with a corresponding output fraction size are met by the bark crushing device according to the invention, consisting of rotary drum rotors with hammers, loosely mounted on pins in the rotor and moving close to the shearing edges at the bottom of the drums. feed conveyor and transport fan.

The bark moved by the belt of the infeed conveyor is held on the first cutting edge by a rotatable driven brush and, upon entering the drum, is roughly crushed by the hammers of the first rotor orbiting the cutting edges. Furthermore, without sorting, it falls into the second rotor, where it is kept to the desired fraction. Hammers with different cutting edge angles can be used in both the first and second rotors to influence the final crushed bark fraction.

After crushing, all bark is sucked from the second rotor by a transport fan and transported to the landfill by the action of the flowing air.

An exemplary embodiment of a bark crushing device according to the invention is schematically shown in the drawing.

In the stands 12, 13, which comprise drums 14,15 with shear edges 9, rotors 1, 2 driven by a motor 10 are located. Rotors 1, 2 are rotatably mounted on pivot pins 8 with hammers 7. In front of the first rotor there is a feed conveyor 3 with a conveyor belt 4 which is provided with a rotating brush 5 and a metal particle detector 6. A fan 11 is connected downstream of the second rotor. The crushed bark impinging on the belt 4 of the infeed conveyor 3 is thereby displaced to the holding and straightening brush 5. At the same time, it retains larger pieces of bark against rapid pulling into the drum 14. In drums 14,15, rotors 1, 2 with hammers 7 rotate just around the cutting edges 9. After coarse crushing in the drum 14, the bark is crushed in a similar drum 15, from which the crushed bark is already extracted and further transported by a transport fan 11.

SUBJECT

Claims (2)

1. A machine for debarking bark from machine debarking wood, comprising two horizontal rotating rotor drums, a feed conveyor with a straightening brush and a transport fan, characterized in that rotating rotors (1, 2) are arranged in the drums (14, 15). ) with hammers (7) orbiting closely around the cutting edges (9) at the bottom of the drums (14, 15), with the first rotor (1) This bark crushing plant can be placed, for example, directly in the line behind the machine debarker, all year round, with the possibility of bark crushing of various properties. OF THE INVENTION a feed conveyor (3) is provided and a conveyor fan (11) is connected to the rotor (2) via a suction port. Device according to claim 1, characterized in that the feeding conveyor (3) with the conveyor belt (4) is provided with a straightening and holding brush (5) and a metal particle detector (6) before entering the rotor (1).