SU1728008A1 - Unit for group barking of timber - Google Patents

Abstract

Use: for group debarking of timber used in the sawmill and pulp and paper industry. SUMMARY OF THE INVENTION: The installation has a base consisting of a frame 1 and a support 2. A bunker 3 with face 4 and 5 and side inclined 6 and 7 walls, one of which (6) has flexible traction bodies 8 with clamps 9. Side tilt angle walls 6 with flexible traction bodies 8 are equal to 50-56 °. the opposite is 72-75 °. while the vertices of these angles are facing one another and to the axis of the rotor 12 with grippers 13 located in the hopper 3. All grippers 9 and 13 have cutting edges. T hp f-ly, 3 ill. J

Description

Learn /// # / WM # / / #

1

The invention relates to forestry equipment, in particular to a plant for the group processing of timber, and can be used to provide raw materials for the sawmill and pulp and paper industry,

The purpose of the invention is to increase the productivity and quality of processing timber.

Figure 1 shows an installation for group processing of timber, a cross-section; figure 2 - installation diagram, plan; FIG. 3 is a graphical method for the basis of the angles of inclination of the walls of the installation.

The bunker-type installation for group processing of timber products consists of the base, into which the frame 1 and the support 2 enter. The bunker 3, having end vertical 4 and 5 and lateral inclined 6 and 7 walls. The wall b is inclined to the horizon at an angle of 50-56 ° and flexible traction bodies 8 with grippers 9 are mounted on it, driven by asterisks 10 and 11. Wall 7 is inclined to the horizontal surface at an angle yes - 72-75 °. At the bottom of the bunker (in this case, at the bottom) there is a rotor 12 with grippers 13. Under the bottom there are guides 14 for dumping the bark and a conveyor 15 for collecting waste. One of the end walls 3 (flap) may be raised to unload timber. In the lower parts of the side walls and in the upper part of the front side wall grooves are made for the passage of the grippers. The rotor, flexible traction bodies, as well as the flap rise are respectively driven from engines 16-18. When debarking the timber in the installation, the external force is the force of the timber load, which actively appears in the zone of their intensive mixing. Grips 9 and 13 have cutting edges.

In the bunker, the most intense friction and debarking of timber occur in the lower part — in the zone of greatest pressure. The pressure from the weight of the timber is crucial because it has been proven that the capacity of the bunker plant is proportional to the square of pressure on the harvested timber. Therefore, it is necessary to ensure that the volume of timber creates the greatest pressure on the bottom of the bunker. This can be achieved by giving the bunker an appropriate geometric shape, i.e. arranging the walls along which the timber moves, at certain angles.

0

five

0

five

0

five

0

five

0

five

The maximum pressure at the bottom of the bunker can be achieved if, by analogy with. The static construction of the plane of the bunker walls will be parallel to the AC and BC planes (FIG. 3) of the slip. The plane of the slide AU or BC accepted the plane where the condition is met:

t C) (1)

where t and bp are respectively tangential and normal components of stress, kg / cm;

p is the angle of internal friction, taken equal to the angle of repose, deg.

The goal is 30-40 °.

The position of the slip planes at the angle of collapse of p - 30-40 ° can be determined graphically.

The angle of slope at dynamic equilibrium is determined by the formula

(2)

A graphical method of construction is shown in Fig. 3 and is as follows. Conduct a segment AB, the angle of inclination to the horizon of which is equal to d. Taking this segment as the base, construct an isosceles triangle AOB in such a way that the angle at the vertex 0 is 2 p. From vertex 0 they are drawn straight, which is perpendicular to AB and divides it in half. From vertex A, perpendicular to the side, the AO is drawn straight to the intersection with the straight line passing through the vertex 0. The intersection point of straight 0 is the center of the characteristic circles. The circle passing through 0 forms a circle of poles, passing through points A and B forms a circle of vertices passing through the intersection points of straight 00 and trimming AB - a circle of platforms. From point 0, a straight line is conducted at an angle g to a straight line 00 to an intersection with a circle of vertices. The intersection point is designated C. By connecting the points AC and BC, a triangle ABC is obtained, which is called the collapse prism, and the sides of the AC and BC determine the direction of the slip planes. In the diagram, the triangle ABC defines the wedge shape of maximum pressure.

If AB is taken as the free surface of the wood moving in the bunker and the sides of the AC and BC are behind the walls of the bunker, then we get the form of a bunker in which the maximum pressure is reached, and consequently, the maximum friction force is reached.

The angles ai / 8 at vertices A and B (degrees) are determined by the formulas:

a 1/2. (| + p + d + arcsln): (3)

(four)

/ (f- -d-arcs.nfJ)

The angles of inclination of the walls to the horizon can be found from the formulas

.(five)

Where. p is the angle of inclination of the front wall.

. (6)

Substituting the minimum and maximum values of the angle p 30-40 ° in formulas 2-6, the limit of the angles of inclination of the front p and rear pi side walls is obtained:

(and 50-56 °; (pi 72-75 °.

The installation works as follows.

Timber is loaded into the bunker by means of a longitudinal conveyor. When the rotor rotates, the grippers located on its surface move the lower layers of timber to the front wall and further upwards until it collapses. The working facet of the gripper notches is made in relief, so when they come into contact with the timber, the crust is destroyed. On the front side wall of the bunker there is a transverse conveyor, on the chains of which there are baffles (their surface is also made relief), which, when slipping under the bottom layer of timber, cut off the bark from them and partially contribute to the movement of timber up the front wall, which positively affects the intensity of their mixing.

The leg occurs when wood products are mixed (i.e., when they rub against each other) when they come into contact with the walls of the bunker and with working surfaces of the grippers-over 5 cutters. The distance between adjacent rows of gripper-notches on the rotor and between chains on the conveyor is less than the minimum length of the processed timber.

10 The removal of bark from the bunker during the debarking process takes place through slots cut in the side walls. The bark is poured along the guides to the conveyor belt, located under the bunker, and carried

15 them.

Unloading of debarked timber is carried out through the valve under the action of gravitational forces.

Claims (2)

Invention Formula 201. Installing .dl batch processing timber, including a base, a bunker with end vertical and lateral inclined walls, one of which has flexible traction bodies with 25 grippers, as well as a rotor with grippers, characterized in that, in order to increase the productivity and quality of processing of timber, the angle of inclination of the side wall with a flexible cable body 30 is 50-56 °, and the opposite is 72-75 °. at the same time the vertices of these angles are facing one another and to the axis of the rotor. 2. Installation according to p. 1. About tl and h and shch - so that the grippers of the traction body and the rotor 35 have cutting edges Fa 3