SU1722612A1 - Device for clearing disbarking waste off impurities - Google Patents

Abstract

This invention relates to the forest and wood processing industry. The purpose of the invention is to increase the productivity and efficiency of cleaning. The devices for cleaning the debarking waste from impurities contain groups of drive rolls 2 and 3 with protrusions. The rolls 2 and 3 are mounted on the inclined frame 1 at an angle of 40-50 °. to the horizon. The neighboring pairs of rolls have an overlap in the form of trays 5. The rotation of the rolls is opposite to the feed of the material being processed. The rolls are involved in the process in pairs with the speed of rotation of the upper roll of each pair higher than the speed of rotation of the lower one. The protrusions of the lower rolls of 2 pairs are made in the form of plates of elastic material, 1 hp, f-ly, 4 Il. cl

Description

The invention relates to devices for the processing of waste from debarking after coring drums and from crust dumps, as well as the separation of bulk materials, and can be used in the timber and woodworking industries.

A device for cleaning debarking debris from impurities is known, comprising a frame in which rolls with protrusions are mounted on the axes and arranged with a gap relative to each other.

The disadvantages of the known device are low productivity, low quality of separation of debarking waste due to the fact that the direction of rotation of the sorting elements coincides with the direction of movement of the incoming material for processing. All sorting elements participate in percents alternately with the same rotational speed. This leads to the fact that not

Intensive loosening of the supplied debarment carpet occurs as it passes through the sorting surface, which results in a reduced separation efficiency. The disadvantage is especially evident when the moisture content of debarking is more than 60%, since adhesion between particles increases with increasing relative humidity.

The serrated shape and rigid structure of the sorting elements contribute to jamming when stones and other solid objects with dimensions larger than the gap fall into the gaps, which, in turn, leads to the removal of the unit, reducing productivity and making it necessary to use manual labor.

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The purpose of the invention is to increase the productivity and efficiency of cleaning debarking impurities.

The goal is achieved by the fact that the frame is inclined to the horizon at an angle of 40-50 °, and the rolls are installed in pairs with overlapping gaps between adjacent rolls of different pairs of trays fixed to the frame, while the rotation of the rolls is directed towards moving the waste,

In addition, the protrusions on the lower rolls are made in the form of elastic linings rigidly fixed on the outer surfaces of the rolls.

FIG. 1 depicts the proposed device; in fig. 2 - scheme of the sorting pair; in fig. 3 and 4 are graphs of the dependence of productivity on the speed Vn of the selling rolls and the size S of the sorting gap. The proposed device contains frame 1, on which at least three pairs of rolls are mounted. Each pair of sorting rolls consists of a feeding bottom 2 and a throwing out top 3 rolls. Speak; 4 rolls 2 are made of elastic material. The gaps between the pairs are blocked by trays 5. Trays 6 are installed under the sorting elements for collecting bark.

The device works as follows.

The debarking waste intended for cleaning enters the lower roll 2 of the first sorting pair, which, rotating, feeds it at a speed of 0.55-0.65 m / s into the calibrating gap. Bark particles, which are small in size compared to the gap, pass through the gap and fall into the trays 6. The presence on the feeding roll of the protrusions 4 contributes to the loosening of the debar waste carpet and reduces the slippage of particles along the surface.

The upper swath of the pair due to the higher speed (1.2-1.4 m / s) and the gear form throws objects with dimensions larger than the calibrating gap onto the overlapping tray 5. A similar process is repeated on the second and third pairs of rolls.

As a result of the processed mixture passing through the sorting surface, bark particles are taken from it through the gaps between the feed and throwing rollers of all three pairs, and wood and stones are moved along the sorting surface.

In the process of removal of large particles, as well as due to the possible unevenness of the loading of the device, the following sorts of pairs and particles of the crust are moved, therefore in the device

several pairs of rolls are used. Three pairs of rolls provide satisfactory cleaning performance and quality: when the number of pairs exceeds three, the device becomes more complex and cumbersome.

The angle of inclination of the plane of the horizontal axes of rotation of the rolls is assumed to be 40-50 ° based on the value of the coefficient of friction of the crust on the steel, varying within 0.8-1.2,

The speed of the lower rolls taken is 0.55-0.65 m / s, since at these values the maximum performance is observed. This is confirmed by the experimental dependence in FIG. 3, obtained when testing the layout of the device with rolls 0.27 m long.

The upper take-off speed VB is calculated on the condition that objects removed from the calibration gap must fall on the next pair of rolls. The calculation is made according to the equation derived from the equation of motion of a point along a parabolic curve.

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2 cos2 p (tg p - Y / X)

where accelerated free fall, m / s; p is the angle between the direction of the throw and the horizon, hail;

X and Y are, respectively, the range and height of the path of movement of the selected object, which depend on the diameter of the rolls and the angle of inclination of the sorting surface.

Roll diameters are taken within 0.16-0.35 m. With diameters less than 0.16 m, the processed material weakly loosens, which leads to a decrease in the quality of cleaning, and vice versa, with a diameter of more than 0.35 m, the dimensions of the device increase without increasing efficiency. cleaning up.

As a result, VB 1.2-1.4 m / s.

The size of the calibrating gap is assumed to be 4-5 the thickness of the bark particles, which ensures the passage of the bark carpet through the gap.

The protrusions of the lower roll are made in the form of plates of elastic material to prevent seizure and breakage of both rolls of each pair by the protrusion when stones and metal objects are removed from the gap.

The proposed device allows, in comparison with the known ones, to increase the productivity and efficiency of cleaning the debarking waste from impurities that are present in the waste after the bark drums and from the bark dumps.

Claims (2)

1. A device for cleaning debarking impurities from debris, including a frame in which rolls are mounted on the axles, having protrusions and placed with a gap relative to each other, characterized in that, in order to increase productivity and efficiency of cleaning, the frame is inclined to the horizon at an angle 40-50 °, and rolls 0 installed in pairs with overlapping gaps between adjacent rolls of different pairs of trays, mounted on the frame, while the rotation of the rolls is directed towards the movement of waste, 2. The device according to claim 1, characterized in that the protrusions on the lower rolls are made in the form of elastic linings rigidly fixed on the outer surfaces of the rolls. FIG. 2 P, t / h 23 # - thirty bO50 FIG. four 60 / o,