SU1752558A1 - Extruder for manufacturing hollow beams - Google Patents

Abstract

The invention relates to the woodworking industry. The purpose of the invention is to increase the productivity and quality of timber. The extrusion plant for making a hollow timber contains a loading chamber 9, a molding chamber 14, a compression chamber 10. In this case, the molding chamber 14 is formed with a flare along the beam movement with a taper angle of 0 ° 13 ± G 7 the compression chamber volume 10 is 0.55 ± 0.04 of the amount of the load and compression chamber. At the output of the camera exposure set covering braking device. Chipboard is fed into chamber 9. The presence of screws 12 and 13 ensures that chamber 9 is filled without voids. The slider 5 moves forward and pushes the timber a step, determined by the load volume. The emptying former b forms an axial bore 7. The shape of chamber 14 provides the residual compressive force in the beam by jamming it after the slide has moved to its original position. The presence of a braking device provides for the creation of compressive forces in the beam until it is solidified. 4 il.

Description

The invention relates to installations for the manufacture of recycled wood raw materials on a mineral in a hollow compressed structural steel bar, intended for use as a building material, and can be applied in the woodworking industry.

The purpose of the invention is to increase the productivity of the installation and the quality of the timber, as well as reduce energy costs in its manufacture.

FIG. extrusion installation, general view; in fig. 2 - section A-A in FIG. 1: in FIG. 3 - section BB in FIG. 1; in fig. 4 — chambers for loading, squeezing and molding, in section.

The installation comprises a yoke 1 on which a piston hydraulic cylinder 2 is mounted, connected by a rod 3 by means of a hinge 4 to a slider 5, provided with an emptying unit 6, intended to form an axial bore 7 in the beam 8 when pressed. Traverse 1 is connected to loading chamber 9 and compression 10, on which

a hopper 11 is fixed to feed the wood shavings into it using two main screws 12 and an additional screw 13. The chamber 10 is followed by the forming chamber 14, having a bell shape, expanding along the beam movement and intended to hold its end after the return Slider to its original position.

The molding chamber 14 is connected to a heating chamber 15 having heating elements 16. This is followed by two accumulating chambers 17. serving to increase the dwell time of the beam in a heated state. The chambers 14, 15 and 17 are provided with heat insulating shrouds 18, 19, 20 and 21. The storage chambers are followed by an exposure chamber 22 and a braking device consisting of two spring-loaded pads 23 designed to create a compressive force in the beam until the end of its hardening. gases from the inner cavity of the beam serves as a hole 24 connected to a vacuum pump,

In order to obtain a uniform mass, the hopper 11 is connected to the loading chamber 9 and squeezing 10 by means of a window and is equipped with a agitator 25, which is driven by an electric motor 26. The hopper 11 has a pipeline 27 for supplying wood-shaving mass from the mixer.

All of the chambers described above consist of the upper 28 and lower 29 cheeks that are interconnected, in which there are slots for installing the side walls 30. The projections 31 and the hollows 32, as well as the face chamfers 33 in the bar 8, are provided with a profile of the upper 28 and lower 29 cheeks. Internal working surfaces of the chambers are made of wear-resistant material.

The installation works as follows.

Wood-based pulp with a mineral in the substance, which includes,%: wood chips 50, magnesite 30, bischofite 20. using screws 12 and 13 is fed into chambers 10 and 11. To increase the plant performance by reducing loading time and the most complete filling of chambers 10 and 11, the volume of the compression chamber should be 0, 04 of the total volume of the loading and compression chambers. The presence of an additional screw 13 ensures the filling of chamber 10 without the formation of voids in its upper part. Next, the slider 5 moves forward and, under a pressure of 15 MPa, overcomes the friction forces, pushing the timber a step, determined by the loading volume. At the same time, the core former forms an axial hole 7, from which the vapor is sucked out of the inner cavity of the beam using the hole 24 in the slider 5, related

with vacuum pump.

The duration of the solidification of the timber, which is in a compressed state, is 120 minutes and depends on the quality and duration of storage of the components. it

the time determines the length of the entire installation, therefore the braking device must be on the border of the solidification time interval of the timber.

The total length L of the installation is determined by

according to the formula

i - 60 Sn

  1 matt

C

where Sn is the step size of the extrusion, m;

t, c is the time of one pressing cycle, s; t. - solidification time of the timber, s. Due to the fact that the length of the heating and storage chambers is less than the total

installation length, an exposure chamber was introduced, the metal intensity of which is significantly less than the metal intensity of the said chambers.

The molding chamber 14 is shaped

socket with a taper angle of 0 ° 13 ± 1. This shape of the chamber provides the residual compressive force in the beam by jamming it after the slide is moved to its original position. When moving a bar

From the molding chamber 14 to the heating chamber 15, compressive forces are reduced, but the occurrence of cracks does not occur due to the larger size of chamber 15.

The trial operation of the proposed plant proved the possibility of obtaining a pressed bar on the basis of secondary wood raw material using minerals in the living area and allowed the use of chips (waste) regardless of the type of wood. At the same time receive construction non-toxic, slow-burning and biostable material. The presence in the construction of the beam and tongue makes this material highly effective in assembling the building. New

The material has properties that allow it to be considered as a potential substitute for scarce building materials.

Claims (1)

Invention Formula An extrusion plant for the manufacture of a hollow beam, containing a power drive, a slider with a hollow, a loading chamber, a compression and a molding chamber, as well as device, characterized in that, in order to improve the quality of the bar by increasing compressive forces, the edges of the molding chamber are made with a bell in the direction of movement of the beam with a taper angle of 0 ° 13 ± I1, the pressure device is designed as a brakes-covering brake and the volume Compression is 0.55 ± 0.04 of the total volume of the load and compression chambers. t figure 1 23 /// // 8