CN203293326U

CN203293326U - Thermofiner grinding disc structure for grass/wood raw material mixture separation

Info

Publication number: CN203293326U
Application number: CN2013202962755U
Authority: CN
Inventors: 周定国; 徐登伟; 张洋; 梅长彤; 李良真; 谢崇界
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2013-05-28
Filing date: 2013-05-28
Publication date: 2013-11-20
Anticipated expiration: 2023-05-28

Abstract

The utility model discloses a thermofiner grinding disc structure for grass/wood raw material mixture separation, and the thermofiner grinding disc structure for the grass/wood raw material mixture separation is applied to a 32-inch grinder, tooth profile layout of the thermofiner grinding disc adopts annular ring partition straight long teeth, and the thermofiner grinding disc structure for the grass/wood raw material mixture separation structurally comprises a fine grinding section, a coarse grinding section and a smashing section. According to the fine grinding section, the annular distance is 112 mm, the number of fine teeth N is 216, the inclined angle between the grinding teeth and the radius is 11 degrees; according to the coarse grinding area, the annular distance is 29mm, the number of the coarse teeth N is 108, the inclined angle between the grinding teeth and the radius is 14 degrees, the tooth length is 30mm, the tooth width is 12mm, the tooth height is 8mm, and the blocking tooth width is 5mm; according to the smashing section, the annular distance is 104 mm, the number of the smashing teeth N is 36, the inclined angle between the grinding teeth and the radius is 15 degrees, and the radius of the periphery of the grinding disc is 406.4 mm. The thermofiner grinding disc structure for the grass/wood raw material mixture separation has the advantages that the cutter edge loading value of the thermofiner grinding disc structure is 0.733 J/m, the thermofiner grinding disc structure is suitable for fiber separation of straw raw materials and straw-and-wood-chip-mixed raw materials, specific energy consumption value is 416 KWh/T, and the grass/wood compound MDF production requirement is met.

Description

Grass/wood raw material hybrid separation defibrator abrasive disc structure

Technical field

The utility model relates to a kind of grass/wood raw material hybrid separation with defibrator abrasive disc structure, belong to the defibrator technical field.

Background technology

In the production process of medium density fibre board (MDF), fiber separation generally adopts large-scale defibrator to carry out, separation process is completed in a high temperature, high pressure, high speed and complete totally enclosed system, therefore, observe defibration process and abrasive disc abrasion condition very difficult.Sweden SUNDS company once designed a transparent grinding chamber body grinding machine, and to observe defibration process, but effect is unsatisfactory.At present both at home and abroad in the theoretical research for the defibrator fiber separation, the heat grinding slurry that mostly concentrates on the pulping and paper-making industry is theoretical, and for the fiber separation research of medium density fibre board (MDF) defibrator carry out extensive not enough.

In the medium density fibre board (MDF) production process, most crucial equipment is exactly defibrator, and it is raw material (wood chip or other biomass material) to be separated into the key equipment of fiber from particle.The usefulness of defibrator work directly affects the quality of final fiber, and then the mass formation of medium density fibre board (MDF) is affected, and it is related to quality, yield, interweaving property, production capacity and the power consumption etc. of output fiber.The operation conditions of defibrator equipment directly affects the enterprise operation cost.Grinding machine is driven by heavy-duty motor, and the raw material particle enters Mo Qu by the screw rod feed system, and the mill district consists of static cutting disk, movable grinding disc and sound abrasive disk space.Movable grinding disc is High Rotation Speed (general speed is that 1500rpm is to 3000rpm) under the drive of motor.The fiber that separates after completing leaves the mill district from the periphery of abrasive disc.Defibrator is the nucleus equipment in medium-density fiberboard production line, and abrasive disc is critical component in defibrator equipment.Because abrasive disc belongs to easily-consumed products (life cycle of a secondary abrasive disc is generally 15-30 days), and cost is higher, thus in production process selection, the abrasive disc material of abrasive disc profile of tooth quality, will directly affect the quality of fiber separation and the cost of enterprise with the adaptability of raw material etc.

The defibrator abrasive disc generally can be divided into two kinds of fan piece subregion and annulus subregions, and roll flute generally has straight shape tooth and two kinds of shapes of arc-shaped gear.For the abrasive disc of same diameter, arc-shaped gear will be grown than straight shape tooth.In the situation that the cutter tooth number of teeth is certain, it is long that arc-shaped gear can improve the cut-out of abrasive disc.But arc-shaped gear is more complicated in design, manufacture process, is unfavorable for that the abrasive disc design unitizes and standardized exploitation, therefore less use in existing abrasive disc design.

Summary of the invention

The utility model proposes a kind of grass/wood raw material hybrid separation defibrator abrasive disc structure, its purpose is intended to overcome existing defect in existing abrasive disc design, makes the abrasive disc profile of tooth can adapt to the hybrid separation of grass/two kinds of raw materials of wood.

Technical solution of the present utility model: the layout that it is characterized in that profile of tooth is directly long tooth of annulus subregion; Comprise from inside to outside three zones, they are fracture area, corase grind district, fine grinding district successively; Wherein

Fine grinding district: ring distance: 112mm, roll flute number: N _{The essence tooth}Article=216,, 11 ° of the angles of roll flute and radius, tooth is long: 14.38mm, the facewidth: 4 mm, tooth depth: 8 mm, the gear facewidth: 5 mm;

Corase grind district: ring distance: 29mm, roll flute number: N _BastardArticle=108,, 14 ° of the angles of roll flute and radius, tooth is long: 30 mm, the facewidth: 12 mm, tooth depth: 8 mm, the gear facewidth: 5 mm;

Fracture area: ring distance: 78+26=104mm, roll flute number: N _BrokenArticle=36,, N wherein _{Broken long}Article=18,, tooth is long: 110.15 mm, N _{Broken short}Article=18,, tooth is long: 80.5 mm: 15 ° of the angles of roll flute and radius;

This abrasive disc is 32 inch diameters, and the peripheral radius of corresponding abrasive disc is 406.4mm.

Advantage of the present utility model: 1) it is 0.733J/m than cutter edge load (SEL) value, is fit to stalk raw materials or stalk wood chip and mixes the fiber separation of class raw material.Its specific energy consumption (SEC) value is 416KWh/T, meets grass/wooden Composite MDF production requirement.2) facewidth 4mm, the tooth depth 8mm of fine grinding district's abrasive disc, the more common abrasive disc that grinds wood fibre is little, has improved the adaptability of abrasive disc for grass/wooden mixed material.

Description of drawings

Accompanying drawing 1 is the schematic diagram of grass/wood raw material hybrid separation with defibrator abrasive disc structure.

In figure 1 is fracture area, the 2nd, corase grind district, the 3rd, fine grinding district.

The specific embodiment

The contrast accompanying drawing, its structure is to comprise three zones, is fracture area 1, corase grind district 2, fine grinding district 3 from inside to outside successively; Wherein

Fine grinding district 3: ring distance: 112mm, roll flute number: N _{The essence tooth}Article=216,, 11 ° of the angles of roll flute and radius, tooth is long: 14.38mm, the facewidth: 4 mm, tooth depth: 8 mm, the gear facewidth: 5 mm;

Corase grind district 2: ring distance: 29mm, roll flute number: N _BastardArticle=108,, 14 ° of the angles of roll flute and radius, tooth is long: 30 mm, the facewidth: 12 mm, tooth depth: 8 mm, the gear facewidth: 5 mm;

Fracture area 1: ring distance: 78+26=104mm, roll flute number: N _BrokenArticle=36,, N wherein _{Broken long}Article=18,, tooth is long: 110.15 mm, N _{Broken short}Article=18,, tooth is long: 80.5 mm: 15 ° of the angles of roll flute and radius;

Embodiment

Fine grinding distinguishes 3: the peripheral Radius A O=406.4mm of known abrasive disc (fine grinding district), roll flute and radius angle ∠ encircle apart from 112mm in OAB=11 ° of fine grinding district, peripheral radius BO=406.4-112=294.4mm

According to the cosine law

,

Must refine district's roll flute length is L _{The essence tooth}=AB=114.35mm=0.11438m,

The fine grinding district cuts off long L ₁For:

L ₁=L _{The essence tooth}* N _{The essence tooth} ²

L ₁=0.11435×216×216=5336.51?m/r

Corase grind district 2: the peripheral radius in known corase grind district: 406.4-112=294.4mm, 14 ° of corase grind districts of roll flute and radius angle encircle apart from 29mm, corase grind district inner arc radius: 406.4-112-29=265.4mm.

According to the cosine law, must roughly grind district's roll flute length is L _Bastard=30.00mm=0.030m,

The corase grind district cuts off long L ₂For:

L ₂=L _Bastard* N _Bastard ²

L ₂=0.030×108×108=349.92?m/r

Fracture area 1: peripheral radius: the 406.4-112-29=265.4mm of known fracture area, 15 ° of roll flute and radius angles, the fracture area ring is apart from 78+26=104mm, broken head of district's tooth inner arc radius: 265.4-104=161.4mm, the short tooth inner arc of fracture area radius: 265.4-78=187.4mm.

According to the cosine law, obtaining broken head of district's roll flute length is L _{Broken long}=110.15mm=0.11015m;

The short roll flute length of fracture area is L _{Broken short}=81.95mm=0.08195m,

Fracture area is cut off long L ₃For:

L ₃=L _{3 is long}+ L _{3 is short}=L _{Broken long}* N _{Broken long} ²+ L _{Broken short}* N _{Broken short} ²

L ₃=0.11015×18×18+0.08195×18×18=62.2404m/r

Obtain the long calculated value of total cut-out of this abrasive disc:

L=L ₁+L ₂+L ₃=5336.51?+349.92+62.2404=5748.67m/r

Calculate the SEL value of this abrasive disc:

According to SEL=

In formula: N is for being used for the effective power (w) of making beating; Be N=N _Specified-N _Unloaded

L is the cut-out long (m/r) that abrasive disc often turns;

N is according to grinding machine actual speed (r/s).

According to the parameter that experiment provides with grinding machine, this grinding machine N _Specified=150KW, N _Unloaded=25KW;

N=N _Specified-N _Unloaded=150-25=125KW=125000W

Mill speed n=1780r/min=29.67r/s

The SEL calculated value of this abrasive disc is:

SEL=

= Other parameters of=0.733J/m4.1.4 abrasive disc

Except the SEL value and SEC value of abrasive disc are used in experiment with computing, we arrange etc. and also to have carried out data and gather for the facewidth, tooth depth, the gear tooth of this abrasive disc, and related data is summarized in table, the design of this abrasive disc gear tooth meets the principle that the gear tooth arranges, keep off tooth in each regional position of abrasive disc by reasonable layout, formed the block pulp line with certain rule in blade surface, the motion of fibre stream has been formed stable pull-back forces.The parameter summary sheet of abrasive disc

Suitably reduce the facewidth, increase the abrasive disc number of teeth, be conducive to like this increase the cutting action of abrasive disc for raw material, be conducive on the one hand the carefully separation of short stalk in mixed material, wood chip for more difficult separation also is conducive to increase shear action on the other hand, realizes the separated in synchronization with stalk.The selection of space width should consider in conjunction with the diameter of abrasive disc, the distribution of gear tooth, space width is larger, the space in teeth groove is just larger, just more be conducive to flowing of raw material and steam between abrasive disc, raw material time of staying between mill will shorten, and need to control the time of staying of fiber between abrasive disc by controlling space width.

The tooth depth scope is at 1-2 times of the facewidth.Stalk is except fiber finer is short, and its macroscopical volume is than wood chip (general 20 * 12 * 6mm ³) also little.Simultaneously, stalk is for the wearing and tearing of roll flute than wood chip little (prerequisite is that the impurity such as silt is less), and therefore the selection of grass/wooden mixed material fiber separation tooth depth can reduce than general abrasive disc.

For make grass/wooden mixed material fully from separating and the mixing of fiber, can consider the different roll flute angle of zones of different selection at mill.When each regional roll flute angle arranges, for avoiding in mixed material, the excessive solution of stalk is fine, prevent the too much appearance of fine powder in fiber, can consider suitably to increase the roll flute angle, increase simultaneously the roll flute angle and also be conducive to increase the extruding centrifugation of roll flute to wood chip, suitably reduce cutting action, be conducive to keep the content of elongate fibres in fiber.And, for the problem that thick stalk content in the fiber that likely causes increases, can consider to improve by the method for regulating abrasive disk space in the defibrator process process.

Abrasive disc gear tooth is arranged on the direction of raw material outflow quantity is how just larger for the raw material flow effect.From the feed stream angle analysis, during grass/wooden mixed material defibrator process, when the movement locus of raw material between mill should separate with pure wood chip, movement locus is consistent substantially.

When in mixed material, the stalk accounting was less, the abrasive disc tooth Shape Design can mainly be considered the characteristic of chip raw material, will suitably control fine powder content in fiber by rational tooth Shape Design simultaneously; When in mixed material, the stalk accounting was more, the abrasive disc tooth Shape Design can mainly be considered the characteristic of stalk, will suitably control by rational tooth Shape Design the content of thick stalk in fiber simultaneously.Therefore,, for different grass/wood raw material ratio, should be differentiated in the selection of abrasive disc profile of tooth.

Claims

1. grass/wood raw material hybrid separation, with defibrator abrasive disc structure, is characterized in that the profile of tooth layout is directly long tooth of annulus subregion; Comprise from inside to outside three zones, they are fracture area, corase grind district, fine grinding district successively; Wherein fine grinding is distinguished: ring distance: 112mm, roll flute number: N _{The essence tooth}Article=216,, 11 ° of the angles of roll flute and radius, tooth is long: 14.38mm, the facewidth: 4 mm, tooth depth: 8 mm, the gear facewidth: 5 mm; Corase grind district: ring distance: 29mm, roll flute number: N _BastardArticle=108,, 14 ° of the angles of roll flute and radius, tooth is long: 30 mm, the facewidth: 12 mm, tooth depth: 8 mm, the gear facewidth: 5 mm; Fracture area: ring distance: 78+26=104mm, roll flute number: N _BrokenArticle=36,, N wherein _{Broken long}Article=18,, tooth is long: 110.15 mm, N _{Broken short}Article=18,, tooth is long: 80.5 mm: 15 ° of the angles of roll flute and radius; This abrasive disc is 32 inch diameters, and the peripheral radius of corresponding abrasive disc is 406.4mm.