SU207802A1 - DEVICE FOR COOLING WOOD MATERIALS, TYPE OF PLATES - Google Patents

Description

Devices are known for cooling wood-based materials such as slabs, coming from a previous process operation in a heated state, including an exhaust fan and a conveyor belt located in a tunnel.

The proposed device is implemented with reflective partitions mounted on the inner surface of the tunnel and dividing it into KonnjOBbie and intermediate sectional zones. In this case, each of the end walls of the tunnel has upper and lower adjustable openings for the supply of cooling air. The exhaust fan is installed in a separate branch pipe mounted on the housing and is offset to its boot end. This ensures uniform cooling of materials across their surface.

To increase air speeds and align aerodynamic resistance along the tunnel length of its end zone section from the material loading side shorter than the end zone sections on the discharge side.

The drawing shows the described device, a view in plan with a slit, along aa. It includes a tunnel / exhaust fan 2 placed on the casing and a conveyor 3 located inside. Reflective lights are mounted on the inner surface of the tunnel

partitions 4 dividing it into kondovye

5 and 5 and intermediate 7 sectional zones. In this section of the zone 5, located with

loading side of the material, shorter than the sections of the tunnel 6 zone located on the discharge side.

Each of the end walls 8 of the tunnel is made with the upper 9 and lower 10 adjustable openings for the supply of cooling-air.

The exhaust fan 2 is installed in a separate pipe // mounted on the tunnel body and is shifted to its boot end.

The operation of the device. The material loaded into the tunnel continuously and rhythmically moves in the direction from zone 5 to zones

6 and 7. The air moves along the plates 12 in a vertical ascending or descending

movement. Its general direction is in the section x / - /// on the principle of pr motorka, and in the V-Vflf- counterflow.

The section / air enters through an orifice regulated by a flap 13 and, lifting up, cools the material. Before it enters the // section and moves downward through the upper opening, which is regulated by the flap 14, air is additionally supplied. In this case, the cooling of the plates is regulated

the plates are washed by the downward flow of air, and in the /// - by the rising air. The reversal of the air flow through the material contributes to the uniformity of its cooling over the height of the plates, as well as to the reuse of air.

When supplying the same amount of air from a torped tunnel to zones 5 and 6, the velocity of air through the material in zone 5, with short sections, will be twice as large as in sections 6. This is one of the signs of novelty and efficiency of supply. .

The exhaust pipe 11, located asi.mtermetrically along the tunnel, above zone 7, takes the same amount of air as well as heat from the material in both zone 5 and zone 6. The temperature of the exhaust air coming from the section /// in the exhaust pipe is close to the temperature of the air coming from section IV, which is one of the signs of efficient use of cooling air.

End zones 5 and 6 have the same aerodynamic resistance, despite their different sizes and the number of sections. In this case, the inevitable unorganized suction of air through both ends of the tunnel, at the points where the conveyor chains pass, is not harmful or even undesirable. This suction cup will therefore be the same at both ends of the tunnel and can be compensated for by covering the holes with flaps 13 and 14 in front of the section / and flaps 15 and 16 in front of the Vlfl section.

The proposed device provides a high cooling rate of the material, achieved by combining the winding (first) and then the counter-current principle of the general direction of air movement and material movement in combination with simultaneous multiple reversal of the air flow over the surface of the plates.

The hot-pressed wood boards, before entering the cooling tunnel, are more heated at the surfaces than in the middle of their thickness.

It is known that for the intensification of convective heat exchange processes at the surface of materials, high velocities of the air washing them are desirable. In the second stage of the process, when heat (or moisture) is removed from the inside of the material, the role of the air velocity factor falls and then on the flow

The process is mainly influenced by the thermal mass conductivity and the time factor. In the proposed device, high air velocity is created. At the very beginning of the process, when it is necessary to remove a lot of heat from the most superficial layers of compressed air.

PLI7.

subject matter

Claims (2)

1. A device for cooling wood materials, such as plates, coming from a previous technological operation in a heated state, including an exhaust fan placed in a tunnel and a conveyor, characterized in that, in order to ensure uniform cooling of materials across their surface, the device is made with reflective partitions, mounted on the inner surface of the obtuse and dividing it into the calf-shaped and pro-day-old section, and each of the tunnel end walls is made with upper and lower adjustable feed openings cooling air, and the exhaust fan is installed in a separate pipe, mounted tunnel tunnel body with its displacement to its boot end. 2. The device according to claim 1, characterized in that, in order to increase the speeds of movement air, and alignment of aerodynamic resistance along the length of the tunnel, section of its end zone from the side of material loading, are shorter than sections of the condo zone from the side of material unloading.