SU737539A1 - Apparatus for transforming a flow of air-entrained fibres - Google Patents

Description

(54) DEVICE FOR TRANSFORMING A FLOW OF AIR SUSPENSION FIBER

I

The invention relates to devices for converting the flow of aerospace fibers and can be used in the pulp and paper industry for the production of various types of paper from natural, synthetic and synthetic fibers, including wood-pulp fibers.

A device for converting a flow of aerospace fibers consisting of a body mounted on a bed, a flat nozzle located in a housing for supplying a flow of aerospace fibers, having parallel lateral and converging front walls, the planes of which are mutually perpendicular, and two rows of blades, is known. located along the front walls of the nozzle, with the planes of the blades of each row and parallel to each other, inclined partitions installed with a gap between them and adjacent to the side walls of the body, Pat ubkov for discharging air, attached to the top of the housing. The planes of the blades of each row make an angle of 55-85 ° with the horizontal plane, the length of each blade is equal to the distance between the side walls of the casing, and the gap between

blade planes are 3.5–20 mm. The rows of blades converge at an angle of 7-22 ° 1.

A disadvantage of the known device for converting a stream of aerosol suspension of fibers is that with an increase in the concentration of fiber in the stream, gaps between the blades can become blocked. Another disadvantage of the known device is the periodic clogging of the orifice with a fiber in the case of air removal from the aerosol suspension in an amount of 80-SK)%

10, the fiber concentration in the air suspension flow becomes high and the fluidity of the flow decreases sharply.

The aim of the invention is to enhance. reliability of operation of the device for converting the flow of airborne fibers and maintaining the homogeneity of the structure of the material to be formed.

The goal is achieved by the fact that the device has a high-frequency oscillation generator and a system of bars and tg, the high-frequency oscillator generator is fixedly mounted on the frame, the ends are connected at one end with the generator and the other end to the slats, and the blades are fixed on the corresponding bars.

FIG. 1 schematically shows the proposed device, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 schematically depicts the connection of a row of blades with a generator of high-frequency oscillations over sections.

A device for converting the flow of airborne fibers consists of a flat nozzle 1 having parallel side and converging front walls, the planes of which are mutually perpendicular. The nozzle 1 is placed in the housing 2, to the upper part of which the nozzles 3 are attached for the removal of air. Under the nozzle 1 there are two rows of blades 4, converging at an angle T of 22 °. The planes of the blades are parallel to each other and form an angle of 55-85 ° with the horizontal.

Each blade 4 has an axis that passes through the walls 5 of the housing 2 into the holes having a diameter equal to 1.5-2 axis diameters. Around the axis, at the intersection with the wall of the housing, there is a rubber cuff. The axis of each blade is connected to the bar 6, and through the rod 7 it is rigidly connected to the generator 8 of high-frequency vibrations. The generator 8 of high-frequency vibrations is mounted on a rigid, fixed base (beam, frame). Below the two converging rows of BOXES 4 there are two inclined partitions consisting of a fixed part 9 attached to the walls of the case at an angle of 120-160 ° and a movable 10, imposed by its stability on the fixed part 9, which can be moved in such a way that the gap between the movable partitions 10 is 1 -1.5 of the minimum distance between converging rows of blades 4.

The housing 2 of the device for converting the air flow is adjacent to a known forming device consisting of a chamber 11, an endless grid 12 and a suction box 13.

Rows of blades can be connected to a generator of high-frequency oscillations in sections, then the oscillation will be transmitted not to the whole row of blades, but to the upper or lower part of the blade row, depending on the operating conditions of the device. Two or more high-frequency oscillation generators can be connected and oscillations of different frequencies are transmitted to different parts of the blades in order to fine-tune the process.

The device works as follows.

From the nozzle 1, a stream of airborne fibers is fed and directed into the cavity between converging rows of blades 4. Due to the descent of a row of blades, the air suspension flow is resisted, as a result of which air begins to flow into the gaps between the blades 4. The fibers of the density suspended in the stream many times more than the air, thanks to inertial forces

continue their movement along the converging rows of blades 4, and in the initial part of the rows of blades 4 the airborne flow velocity is maximum, therefore, the maximum manifestation of inertial forces takes place. Therefore, relative motion of air and fiber masses is easily achieved.

However, the likelihood of entrainment of the fibers is small, thanks to the creation of a significant relative motion of the fibers and air.

The fibers impacting their movement on the shoulder blades 4 are reflected from their planes or slide off of them (depending on the elasticity of the fibers), do not fall into

the gaps between the shoulder blades. With further increase in the concentration of fibers possible ablation of fibers. In order to reduce it, as well as to improve the gliding of fibers, the surface of the blades overlap the high frequency in the same way that the angle of inclination to the horizon of the vector of oscillatory movements coincides with the angle of inclination of the blades. Oscillations arise due to the vibration of the gigi 7, which is connected at one end to the generator 8,

J and the other end with bar 6. From the bar 6, the vibration is transmitted by the blades 4 due to the rigid attachment of the bars to the bars. In the process of vibrating the blades, the boundary layer is destroyed near the surface of the blades, and the flow past them

By air, there is much tension, and besides, the fibers, in contact with the vibrating blade, receive an additional impulse of movement, which generally leads to an increase in suspension fluidity along the surface of the blades, this is especially important in the zone with the greatest concentration, i.e. at the exit of the gap formed by the last row of blades.

The introduction of the device in the industry will improve product quality and increase the productivity of the forming device by 30%.

Claims (1)

Invention Formula A device for converting the flow of aerospace of fibers, including a body mounted on a frame, a flat nozzle for supplying a flow of fibers to the body, having parallel side and converging front walls, two rows of blades located along the front walls nozzles, inclined baffles adjacent to the side walls of the housing, and air exhaust pipes connected to the upper part of the housing, characterized in that, in order to improve the reliability of the device and preserve the homogeneity of the structure of the material to be formed, it has a high-frequency oscillator and a system of bars and t g, the generator of high-frequency oscillations fixedly mounted on the frame, ti gi are connected at one end with the generator and the other condom with the slats, and the blades are fixed on the slats corresponding to them. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 568276, D 21 H 5/26, 1975 (prototype). AeroWeightFiber Voguh Voz) ( Puz. one Aer es 737539 2. / (ero8z6es Volo} oi Air Air phage.5