FI102735B - Sawing equipment for sawdust - Google Patents

Description

1 102735 Sawdust Screening Equipment.

BACKGROUND OF THE INVENTION The present invention relates to a screening apparatus suitable for screening chips produced by saws, plywood mills, and separate chipping stations, wherein unwanted oversize (greater than 45 mm) chips 5 are separated from the chips by a vibrating conveyor screening unit. 8 mm) chips and finally, with the vibrating conveyor screening unit, unwanted fine chips (sticks + chips).

The sawdust screening apparatus of the invention is an inexpensive, space-saving, energy-saving, and easy-to-maintain apparatus for accurately removing unwanted coarse and fine fractions in chips (fractions 1 + 2 and 5 + 6).

The requirement for chips to be purchased at pulp mills is that the 15 chips are screened before delivering to the pulp mills.

They are currently screened almost invariably with bar or wire-mounted flat screens with a screen plate e for the removal of unwanted oversize (more than 45 mm) chips with a screen size of 0 to 35 mm.

20 The lower sieve plate of the flat screen removes unwanted chips (sticks + disintegrate) of the chips, the hole size is normally 0 8 - 12 mm.

In some flat screens, there may be a third screen plate in between, and often a solid spacer to guide the chipping from the upper '···' screen to the beginning of the next screen.

* · # · * 2.! * '25 Each screening plate has a surface area of 5 to 9 m.

• · * · · • · · J,! · Expensive, space-consuming and heavy-duty equipment is often difficult because screen screens may become clogged even after a short run.

.'j * · Maintaining and cleaning the screen always requires a break in production and the opening of the screen and the bottom screen often requires the disassembly of the '···' screen.

Resinous wood, and in particular winter temperature changes, cause the screening clogging and screening performance to be significantly reduced.

2 102735 35 As a result, this always results in a poor quality sales application and, consequently, large price reductions ("fines") for the sales application.

Existing flat screens, when well maintained and properly dimensioned, are capable of moderately removing the oversized chips (fraction size 1 fraction, length over 45 mm), and fine chips (range 5 + 6, length less than 7 mm), but the chips resulting from chipping ( Fraction 2. Thickness greater than 8 mm, Length less than 45 mm) runs through the holes in the top screen plate completely for sale.

The normal flat screen is completely powerless for this unwanted chips 45 fraction.

This fraction is usually generated in chippers and edged cutters only from 5% to 20% of the total amount of wood produced, depending on the species of wood, log thickness, weather (temperature), and the settings and condition of the chopping devices.

50 In separate chipping with drum or disc chippers, especially in the case of short chips and screen pass chips, this unwanted over-thick fraction is formed by 20-40%, which also escapes the entire chipping burden.

Depending on the relative share of these raw materials to be sought in the total chips production, the proportion of unwanted oversized chips ranges from 5% to 15% in screened chips.

· _; In recent years, the rapid shift in equipment procurement to efficient ... ^ plain chippers and in chips for surface boards, rims, equalizers, and sieve overcuts to multi-blade drum shredders has helped to reduce oversize (over 45mm) chips. for chips, with only a small portion of the upper sieve belt of a standard flat screen being used, the chips will • • • · * pass through the screen, often within the first 50 cm.

• · · • · · *, Excessive chips (above 45mm) especially in simple chips: (ii: 65 hardly any chips are produced. On the other hand, especially in the first chipping phase, unwanted over-chips (over 8mm thick) are produced until the problem and with flat screens, this problem cannot be treated at all.

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All in all, the heavily elaborated and developed flat screen sieve for pulp mill pollen chips is always less suitable for sawmill chips, which have undergone major changes in composition in recent years.

The sawdust screening apparatus of the present invention provides a decisive improvement in the above-mentioned drawbacks and problems, and makes the screening apparatus more responsive to the high quality standards of today's sawdust.

To accomplish this, the sawdust screening apparatus according to the invention is characterized by what is stated in the characterization sections 1,2 and 3 of the patent claims 80. »

The main advantages of the invention can be considered to be a simple, lightweight and modifiable structure, easy to monitor operation and maintenance, and cleaning of the equipment even when the equipment is running.

The screening power of the screening apparatus according to the invention is selectively directed to all unwanted chips fractions, and if desired, even the thick chips (greater than 8 mm thick) can be completely eliminated, which is not possible with current flat screens.

The screening apparatus according to the invention is dimensionable, adjustable, adjustable and adjustable precisely for each chipping site. Depending on conditions and requirements. ha-; milling machines, wood chips base, production volume, and sales «« <• · # ···. quality requirements and pricing criteria for the cinder.

• · ♦ ♦ · · * · .. This allows you to select the screening equipment for different chipping locations. * J *. 95, suitable mesh sizes for screening plates, and adjusts the distance of the rolls rotating in the screening of over-thick chips to a desired ·. ·, Si (7 - 10 mm) by accepting part of the over-thick chips for sale. chips (with a gap of more than 8 mm) in the purchaser's pricing permissible • · · * quantity.

'· "· 100 The distance adjustment of the roller roller rollers (sorting slot setting) is easily accomplished by locking the rollers at desired distances from their bearing housings with locking screws to the rails mounted on the roller screen roller frame.

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The slope of the roll web is adjustable by raising or 105 lowering the front end of the roll web with a fixed bearing bar according to the amount of chips production and the general characteristics of the chips.

The screening portions of the apparatus for removing the various chips fractions may be located other than partially overlapped as shown in the following figure.

Depending on the space used, they can also be placed sequentially, or even in an old chipping line after a conventional flat screen, as a mere roller screen roll to remove the unwanted over-packing chip fraction.

115 At a chipping site where little oversize (over 45mm) chips are generated, the upper vibrating conveyor screening unit of the screening equipment can be completely omitted and the screened chips directly fed to the roller screen roller, which is able to distinguish fairly accurately even the oversized chips fraction. also thick (more than 8 mm).

The sawdust screening apparatus according to the invention has an optimization of the quality of the chips with respect to the particle size distribution underlying the purchaser's pricing and thus ensures the best possible chips for the chips manufacturer.

125 Monitoring and adjusting the efficiency of chipping itself is also easily achieved by observing the unwanted coarse chips (oversized and over-thick) separated by the upper tumbler conveyor screen and roller screen roller. or failure, the appropriateness of the selected chip length, the changes in the raw material base during production, and on the basis of these considerations, draw conclusions and possible corrective actions on the spot.

• · · • · · *. The invention will now be described in detail with reference to the accompanying drawing.

3.35 Figure 1 shows a top view apparatus for sawdust according to the invention, and Figure 2 shows the same; s eu lont ai a 11 e s s s s s s s s e s s s e s s e d.

102735 5

In Figures 1 and 2, a screening apparatus for a vibrating conveyor-sieve unit (1) is fed with a non-screening chips which is moved by a tilt of the vibrating conveyor-140 tin-sieve unit (1) and an electric motor-driven vibrator forward through a sieve as the chips pass through the holes and the oversized chips (greater than 45 mm) pass into the closed 145 stern portions of the vibrating conveyor screening unit (1), from which they can be guided with the conveyor to the conveyor (4). uudelleenhaketukseen.

The efficiency of screening for oversized chip separation by the vibrating screen screen unit (1) can be ascertained in patent no. 150 95356 (B 078 1/46, 1/38), whereby raising the leading edge of the screening hole and rounding the trailing edge prevents chips that are too large but narrower than the screening hole from hardening into finer chips.

The chips conveyor screening unit (lj through chips; (-155 to less than 45 mm)) fall slightly on a downwardly inclined rotary roller screen roller (2) with a screening gap between the rollers adjusted to the desired (7-10mm).

Similarly, the length, width, and length of the entire roller screen roll (2). , the steepness is selected and adjusted according to the size of the production and the local search characteristics.

. ·, The electric motor rotates the knob to the wheel 1 # ···. (2) rolls and over-thick (> 8 mm) chips move towards the closed end of the roll • • screen roll (2) and allowable thicknesses (less than 8 mm) of chips between rotating rolls • · ♦ • * · * 165 of the finely adjusted slots for the subsequent removal of unwanted fines (sticks + dismantling) in the chips • ·: ** to the expanded vibratory conveyor screen unit (3).

• «· • · ♦ • · ·

The over-thick aspen pieces that have passed to the end of the roll web roll (2) can be guided through the trough to the same conveyor (4) · '· 170 as the oversized chips and from there re-fetched. by touch.

· _; The 6 102735 chips torn from the gaps between the rolls of the roller roller roller (2) fall onto a vibrating conveyor screening unit (3) having a surface area and a hole size selected (0 7-12 mm) also according to local factors.First part of a fine separating vibrating conveyor screening unit (3) the screen portion is widened (90-140 cm) to ensure screening power.

The screening holes of the vibrating conveyor screening unit (3) shatter the debris and chip chip fraction (= aggregate fines) below the debris chamber 180 · (5), from where they can be conveyed to the debris warehouse.

The screened chips (sales chips) remaining on the screen plate of the vibrating conveyor screening unit (3) can be routed normally to the sales chips warehouse and removal of fine chips from the chips can be ensured by an additional screening section at a later stage in the vibrating conveyor screening unit 185 (3).

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Claims (3)

1. Sawing apparatus for sawdust suitable for cutting wood chips produced by saws, ply-wood factories and separate chipping stations, characterized in that too large pieces can be saved in the chip with a feed end widened, driven by a vibration motor, slightly lower inclined shaft port. sealing unit (1), the bottom of which is a sealing plate which separates too large chips and at the discharge end of the shaft conveyor sealing unit (1) there is a chute for removing the too large chips. In the chip housing too thick chip pieces can be separated by an electric motor driven, with chain transmission, down-sloped, rotating roller sealing roller web (2), whose slope and sealing nip between the rollers are regulated in the desired manner. Chip pieces thicker than the sealing nip can be removed from the closed discharge end of the roller sealing roller (2) along a chute. The knitting and saw buckets contained in the chips can be separated by a widened shaft conveyor seal unit (3) widened at the sealing end of the feed end, which tapered at the transition to a clean shaft conveyor. The bottom of the shaft conveyor sealing unit (3) consists of a sealing plate which removes the fine particles in the chip. 2. Roller roller web (2) in the sealing apparatus according to claim 1, characterized in that frame-driven, hollow roller rollers have been mounted on rails arranged on the roller beams of the roller roller roller (2) so that the roller rolls can be read at their respective bearing housings with tensioning screws. other on the rails' rails and the sealing nip between the rolls of the roller sealing roller (2) are thus regulated in the desired manner. Rolling roller (2) according to claim 2, characterized in that the slope of roller rolling (2) can be controlled by lifting or lowering the feed end of the rolling roller (2) and the rolling roller (2) can be read in the desired slope.