FI88056C - Device for smooth feeding of wood chips from a container to a process line - Google Patents

Description

1 88056

Device for feeding wood chips evenly from a tank to a process line

The present invention relates to an apparatus for transferring material from a storage location to a process line, and in particular for transporting wood chips from chip boxes to a grinding process line for the production of cellulose.

The basic problem in handling the plug flow material is the tendency of the plug flow material to pack and wedge and form non-detachable areas in the flow so that continuous flow is prevented.

When grinding wood chips into cellulose in the production of paper, the quality of the cellulose can be improved when the grinding phase of the paper mill is kept stable, i.e. there are no interruptions in the flow of lines when feeding wood chips to fiberizers and grinders.

Screw feeders are often used to feed feed materials. The basic problem with all plug screw feeders is the tendency of the chips to clog against the feed point of the hopper: on the discharge side, causing reduced box flow, full filling of the screw plug and in some cases. on the discharge side of a chip box with a full packing hour. This compaction problem is exacerbated when sodium sulfite and steam are added to the chip box due to swelling and softening of the chips, which adversely affects the chip flow characteristics. The chip flow characteristics also deteriorate when the chip quality, i.e., particle size and shape, does not remain exactly the same.

Flake axial flow occurs in the form of trudging auger rise of the outlet side of the area. Congestion is more pronounced in plug screw feeders because the compression zone is located on the outlet side of the riser. As a result, there is no free space for the chips to flow. Plug screw feeders with a single mixing wiper usually suffer from wood chip vortices above the plug screw, causing uneven landing from the storage box. The graphical diagram corresponding to the speed of the screw feed screw is usually non-linear when using a single mixer. One agitator has been used in screw feeders in the past, but these vibratory feeders usually had to use conventional vibrating through-pieces. These pieces are usually installed between the outlet chute of the storage box and the screw feeder. However, the feeder of the present invention does not need such a piece.

US-A-4 518 262 shows a screw conveyor outlet side of which is swept by one mixer outlet side of the screw conveyor at the feed end. The shaft of the mixer passes perpendicularly over the axis of rotation of the screw in the screw conveyor so that the material is invariably accelerated radially to the feed end of the screw conveyor towards the full end face of the screw rise.

... U.S. Patent 4,443,109 has one agitator perpendicular to the axis of rotation of the screw conveyor. The agitator blades ‘’ sweep the conical vessel from the top of the rises of the screw conveyors; “Side, but move vertically along the length of the cylindrical trough between the container and the screwdriver housing.

Grinding processes that do not have a constant flow rate remain at an undesirably low level of grinding when processing wood chips into quality cellulose.

In view of the disadvantages of the screw feeder flow patterns described so far, it is an object of the present invention to provide such a machine which is not prone to variations in the material feed flow.

I; 3,88056

The transport system of the present invention includes two mixers that sweep directly over the top of the plug screw feed risers for the purpose of transporting wood chips as liquid slurry from the chip box to the plug screw. The plug screw then feeds the grinding line evenly without difficulty in the form of flow interruptions, packaging or chip entrapment. The double mixers located in the feed box wipe the fillings into the plug screw feed trough while leveling, which stabilizes the amount of material entering the grinding line process of the plug screw feed.

The feed chute acts as a chip tank and buffer between the plug screw and some stock flow interruption. The semicircular feed troughs connect both mixers together, and their bottoms are approximately flush with the tops of the plug screw rises. Increased uniformity in the plug screw feed provides a more stable grinding line process and therefore improves the quality of the cellulose without otherwise altering the grinding process. The characteristics of the present feeders control the uniformity of the flow of wood chips and cellulose in the grinding zone between the surfaces of the grinding plates and discs. This flow is critical to the ability of the grinder to form quality cellulose fibrils, i.e., curly, twisted fibers with or without the formation of • extra chips, short fibers, or small wood particles.

Kaksoissekoitintulpparuuvisyöttö remove pakkautumisongelmat, "which can occur in the chip discharge side of the box and the cap screw between the feed by removing chips sulloutumisen in this region.

The smoothing effect of the mixer with the feed screws of the plug screw results in a better rise charge and a more even feed. This increased smoothness in the plug screw feed provides a more stable grinding line process.

4,88056

The twin mixer plug feeder can be fed directly from the screw conveyor or another type of pulsating feed system without adversely affecting the stability of the grinding line.

Storage box outlet side of the opening can be opened or increasing the supply trays loaded gauge. The enlarged outlet side of the box reduces the packing of the box in the conical part of the box.

The essential features of the invention are set out in the appended claim.

The present invention will be described in more detail with reference to the accompanying drawings, in which: Figure 1 is a sketch of a feed chute and a feed trough showing the center of each semicircular feed tray and the positions of the blades in the semicircular portion a conical portion of the box through the gear assembly taken through the axes of rotation; however, the shafts, the vertical bearing brackets and the drive motor are illustrated in a side view, Fig. 3 is a cross-sectional view of the vertical bearing bracket in line

Ill-lll in Figure 2.

Referring to the drawings, the main stand 32 supports a casting cylinder 20 of a standard plug screw. The plug screw 22 is housed in the cylinder 20. The plug screw 22 is housed in the cylinder 20 and is driven by a gear motor (not shown). Two rotating vertical shafts 16 and 17 are mounted on the support bearings 18. These shafts are mounted centrally perpendicular to the screw axis of the plug screw 22. The centerlines of the shafts 16 and 17 are on each side of the plug screw 22 and their centerlines perpendicular to the axis of the screw are in the same vertical plane on opposite sides of the plug screw 22. The mixing paddles 14 and 15 are attached to the tips 16 and 17 of each shaft 5 88056 and sweep directly over the tops of the plug-screw feed risers 24. An array of three gears 26 mounted on the base of the main base 32 rotates the vertical shafts 16 and 17. A gear 26 is attached to the bottom of each of the vertical shafts 16 and 17, and these gears are rotated directly from a gear 26 mounted directly at an angle to a gear motor 28 using agitators 14 and 15. The gears 26 are in planar gear, and each gear in a row of gears rotates in the opposite direction to each of its neighbors. Therefore, since the blades 14 and 15 are rotated in a planar manner by contacting gears 26 in a row of gears, the blades 14 and 15 eliminate the tendency of the material to rotate in the feed chute 10, causing uneven landing from the cone portion 36 of the storage box. Above 24, this wiping motion keeps the feed rises 24 evenly filled by effectively leveling the feed material at the top of the feed rises 24. The pair of oppositely rotating agitator blades promotes the wiping effect directly above the screw rises 24, where it is most efficient and covers the largest area of the screw 22 feed. This system of two mixing paddles 14 and 15 instead of one mixing paddle also allows the use of shorter blades 14 and 15, which allows for higher speeds and thinner mixing paddles 14 and 15 due to lower torque requirements.

The feed chute 10 is bolted directly to the top of the feed tray 12. A conventional vibrating modifier, usually bolted to a storage box, is neither necessary nor of any value to the present invention. The feed chute 10 is attached to the outlet side 35 of the tank box and acts as a buffer zone between the plug screw 22 and some flow interruption from the storage box 36.

6 88056

The feed trough 10, the feed trough 12 and the combination of the double mixing blades 14 and 15 remove the storage box pakkautumisongelmat-Tikon the outlet side of the conical part 36 by preventing the material discharge side sulloutumisen area.

The twin mixer plug screw feeder 34 can also be fed directly from the screw conveyor or another type of pulsating feed system without adversely affecting the flow stability of the process line.

In addition, the discharge-side opening 36 of the storage box can be opened, or to increase the feed troughs due to the increased width. The enlarged drawer discharge side reduces the packaging of the storage box in the conical part of the box.

The support bearings 18 support the rotating shafts 16 and 17 and the agitator blades 14 and 15 attached to the shafts 16 and 17. The rows of gears 26 are supported on the one hand by bearings (not numbered) at the end base 32. The head base 32 also supports the right angle gear 28 at right angles. . The motor itself is bolted to a support plate (not numbered) on the side 32 of the main stand.

] As the feed material falls by gravity through the conical portion 36 of the storage box into the feed chute 10 and then into the feed tray 12, the mixing paddles 14 and 15 continuously assist immediately above all the feed pins of the plug screw feeder. The plug screw feeder of the cast cylinder 20 and 24 between the axial flow mode increases is facilitated by wiping the compression zone above the space which is located above the plug screw feeder outlet side. By removing the congestion of the feed material above this compression zone on the outlet side of the feeder, the compression problem of the plug material flow can be solved.

l; 7 88056

The size of the feed chute 10 can be opened or increased to match the added width of the feed trays 12. The enlarged discharge side of the box reduces the packing of the filler flow as the packing formation distance increases to the width of the feed trays 12.

It will be appreciated that the apparatus described above can be used to feed material from a screw or screw conveyor or pulsating feeder as well as from a container, and the use of the term "material storage source" in this context includes storage boxes, screw and screw conveyors, pulsating feeders and similar means for feeding.

Although the invention has been described in some detail, it is to be understood that the present invention has been made by way of example only, and that the scope of the invention is as defined in the following claims.

Claims (1)

An apparatus for feeding wood chips from a chip box (36) to a grinding process line for producing cellulose, the line passing below the chip box, the apparatus comprising: a. A screw feeder placed in the grinding line therethrough, said screw feeder having a screw (22); parallel, and a feed port for receiving the material in the screw, the screw being adapted to rotate about its axis, thereby allowing the received material to pass through the grinding line; b. a feed tray (12) located in direct contact with the screw feeder feed port and an outlet in said feed tray to the screw feeder feed port, and a feed port for the material to be received; c. a feed chute (10) to connect the chip box (36) to flow communication with said trough (12), thereby creating a flow path therebetween and a feed opening adapted to the outlet of said chip box (36) in said feed chute to receive said wood chips therefrom and a feed opening to said feed trough (12) to get wood chips there; and d. in said feed trough (12) in the immediate vicinity of its outlet opening mixing means (14, 15) for wiping wood chips from there through the feed opening to the screw feeder screw (22), said mixing means (14, 15) mounted on rotating shaft members (16, 17) arranged perpendicular to the screw ) with respect to the shaft, the agitating members (14, 15) mounted on the shaft members (16, 17) rotating about an axis of rotation perpendicular to the axis of the screw (22) of said screw feeder, characterized in that said agitating members (14) mounted on the rotating shaft members (16, 17) , 15) include a pair of agitator blades (14, 15) mounted on a common horizontal plane, one (14) mounted on the first rotary shaft member 9 88056 (16) and the other (15) mounted on the second rotary shaft member (17) of said first and second rotary shaft members (17). the shaft member (16, 17) being located on opposite sides of said screw (22), and their axes of rotation are in a common vertical plane, the common vertical plane being positioned perpendicular to the axis of said screw feeder screw (22), said first rotating shaft member being rotated clockwise and said second rotating shaft member counterclockwise, said pair of blades in comparison to each other. Apparatus for the manufacture of non-woven fabrics (36) account for the use of non-woven fabrics for the manufacture of masses, including: a. parallel to the axis and to the end-of-life of the material in which the material is rotated in order to rotate the axis of the axis of the motor genome for refining; (b) that the inlet end (12) is arranged to be scraped in and out of scrap and to be scrapped in addition to scraped in addition to the material; c. in the case of inlets (10) in the case of non-exhaust fleets (36) and in the case of in-room fittings (12) and in the case of non-exhaust fittings in the same way as in the case of in-room fuses (36) (12) inloppsöppning för infö-rande av träflis däri; och d. pämatare (14, 15) vilka är anordnade i inloppsträget (12) intill dess utlopp för att sopa träflisen därifrän. 8 88056 genomic incopy and to plug screw screw (22), colors of the head screw (14, 15) and mounted to the rotary axis of the rotor (16, 17), bristles and plugs to the axle of the screw screw (22), colors of the axis of the screw (16), 17. a rotating ring (14, 15) mounted on a rotating shaft with a screw (22), which turns the rotating shaft (14, 15) into a rotating shaft (16, 17) of a rotating shaft (16, 17) av pAmatarblad (14, 15), vilka är monterade pA ett gemensamt horizontally plan, av vilka ett (14) är monterat pA ett första roterande axelorgan (16) och ett (15) är monterat pA ett andra roterande axelorgan (17), colors of the rotor axle body (16, 17) and the rotor shaft (22) of the rotor shaft (22) with a rotating axle (22), the colors of the rotor shaft (22), the colors detached from the rotor shaft (22) organet kringvrides medurs och a tt det andra roterande Axel-organet kringvrides moturs, varigenom nämnda par pAmatarblad kringvrides i inbördes motsatta riktningar. I;