CN202440712U

CN202440712U - Large-diameter grinding plate with diameter above 58 inches for defibrator

Info

Publication number: CN202440712U
Application number: CN2011205499003U
Authority: CN
Inventors: 花军; 陈光伟; 张绍群
Original assignee: Northeast Forestry University
Current assignee: Northeast Forestry University
Priority date: 2011-12-26
Filing date: 2011-12-26
Publication date: 2012-09-19
Anticipated expiration: 2021-12-26

Abstract

A large-diameter grinding plate with a diameter above 58 inches for a defibrator is a disc-like grinding plate consisting of 8 to 12 fan-shaped grinding plates. Each fan-shaped grinding plate can be orderly divided, from the center to the periphery, into a crushing zone, a rough grinding zone, a half-fine grinding zone and a fine grinding zone. Each zone is formed by grinding teeth and circumferential teeth. A gap of 5-8 mm is arranged between adjacent zones. The fan-shaped grinding plates are characterized in that the ratio of the length of the four zones along the radial direction is 3:2:2:3. Inclination angles of the grinding teeth in each zone are different and increase in arithmetic progression with a tolerance of 8 DEG to 13 DEG, wherein the inclination angles of the grinding teeth in the fine grinding zone is 0 DEG to 5 DEG and the inclination angles of the grinding teeth in other zones increase in arithmetic progression. According to the utility model, the separating energy consumption of fibers is reduced while the separating quality of the fibers is improved. The grinding plate operates stably and is low in production cost.

Description

A kind of big footpath level defibrator abrasive disc more than 58 inches

Technical field

The utility model relates to the big footpath level defibrator abrasive disc that uses in a kind of Fibreboard Production industry.

Background technology

Fiber production is the important workshop section in the Fibreboard Production; The fiber form that this workshop section produced, size will directly influence the quality of sheet material; The energy of its consumption (comprising power consumption and hear rate) accounts for about 50% of Fibreboard Production total energy consumption, and above-mentioned two factors all have confidential relation with the tooth-shape structure of abrasive disc.Theoretical according to the fiber defibrator process; Grind in the process of raw material at abrasive disc; The setting at abrasive disc roll flute groove arrangement mode, roll flute inclination angle, circumferentially tooth abrasive disc tooth-shape structure parameter determining such as profile of tooth and arrangement stressed, the motion state and the milling time of slurry in the defibrator process zone, quality of fiber and fiber separation energy consumption are had material impact.It is historical to make a general survey of abrasive disc 70 years of development, and the abrasive disc diameter increases the trend that the abrasive disc diameter is the abrasive disc development always from initial 36 inches develop into present maximum 74 inches.Big footpath level abrasive disc can increase the effect frequency of external force to slurry effectively, can improve fiber separation quality and separative efficiency, can reduce the separating energy consumption of fiber again, saves production cost.But existing big footpath level defibrator abrasive disc; Because the abrasive disc diameter is bigger; It is unreasonable that each roll flute inclination angle, defibrator process district is provided with unreasonable or circumferential tooth row row mode, all can cause slurry at each district's time of staying skewness weighing apparatus, causes the fiber overmastication; Fibre structure damages, and produces fiber fines and fiber surface and inside and fibration occurs.

Summary of the invention

The purpose of the utility model provides a kind of milling time that can limit slurry, can not damage fibre structure, can improve the disintegrate-quality of fiber, reduces the separating energy consumption of fiber, a kind of big footpath level defibrator abrasive disc more than 58 inches of practicing thrift cost.The technical scheme of the utility model is: a kind of big footpath level defibrator abrasive disc more than 58 inches; The disk abrasive disc of forming by 8-12 sheet fan type abrasive disc; Every fan type abrasive disc is divided into fracture area, corase grind district, half correct grinding district and correct grinding district successively from its center to outward flange; Each zone all comprises roll flute and circumferential tooth, and the 5-8mm gap is arranged between the adjacent area, and be characterized in: four zones of described abrasive disc are 3:2:2:3 along the radial direction length ratio; Each is distinguished roll flute inclination angle difference and is arithmetic progression and increases progressively, and tolerance is 8 °-13 °, and wherein roll flute inclination angle, correct grinding district is 0 °-5 °, and other zone increases progressively by arithmetic progression successively.

A kind of big footpath level defibrator abrasive disc more than 58 inches; The partly correct grinding district of said abrasive disc and the circumferential tooth in correct grinding district form circular-arc retaining slurry line jointly in the wafer lapping machine surface; The radius of curvature of circular arc equals the ring distance of abrasive disc inside and outside circle; The center of circle is positioned on the circle of abrasive disc, and home position is that keeping off the slurry line is that above-mentioned circular arc and half correct grinding are distinguished and correct grinding is distinguished the part that intersects with each Along ent behind the branches such as circle 28-32 in the abrasive disc.

Described abrasive disc has the secondary gradient, and wherein the first order gradient is positioned at broken section, and the gradient is 1:100-150, and the second level gradient is positioned at the corase grind section, and the gradient is 1:200-250.

The utility model can improve the degree of fragmentation of wood chip owing to adopt bigger fracture area area, reduces the power consumption in correct grinding district, makes abrasive disc Shang Ge district's power consumption and wear extent more become balanced; The set-up mode at abrasive disc roll flute inclination angle can quicken the outflow of slurry, has avoided owing to the abrasive disc diameter makes the overstand of slurry in the defibrator process district greatly; Circumferentially the arrangement of tooth can prolong the time of staying of slurry in the correct grinding district, can improve the quality of fiber separation, can avoid again causing internal pressure to change greatly the equipment fluctuation of service because of circumferential tooth coincidence moving, that decide on the abrasive disc; Fracture area is designed with the secondary gradient of roughly grinding the district and is beneficial to feeding more swimmingly, also can compensate the abrasive disc deflection that is caused by centrifugal force and steam pressure simultaneously.The utility model can reduce the energy consumption of fiber separation, improves the disintegrate-quality of fiber, stable equipment operation.Through experimental verification; Under identical process conditions; The utility model abrasive disc is compared the power consumption of production unit quality bone dry fiber and is reduced to 112kW/t by 120kW/t with common abrasive disc; Acceptable fiber quality (the mensuration sample quality is 10g) rises to 6.32g by 5.46g, and abrasive disc on average prolongs 10～12h service life.

Description of drawings

Fig. 1 is the fan-shaped abrasive disc structural representation of the utility model specific embodiment

The specific embodiment

With the common Changbai Mountain larch (early wood) in the Northeast is that example further describes the utility model.

The disk abrasive disc that the utility model is made up of 8 fan type abrasive discs; Every fan type abrasive disc is divided into fracture area 1, corase grind district 2, half correct grinding district 3 and correct grinding district 4 successively from its center to outward flange; Abrasive disc fracture area 1, corase grind district 2, half correct grinding district 3 and correct grinding district 4 are 3:2:2:3 along the radial direction length ratio, and the 5mm gap is arranged between adjacent area; Each zone all comprises roll flute and circumferential tooth, and each district all adopts the directly long tooth of annulus subregion, and the cross sectional shape of roll flute is isosceles trapezoid.The roll flute inclination angle can be selected according to raw tree species, and Changbai Mountain larch material is harder, and fiber is difficult to be separated; Therefore respectively distinguishing the roll flute inclination angle should be advisable more greatly; The correct grinding district gets 5 ° in 4 roll flute inclination angles, and tolerance is got 10 °, and then 3 roll flute inclination angles, half correct grinding district are 15 °; 2 roll flute inclination angles, corase grind district are 25 °, and fracture area 1 roll flute inclination angle is 35 °.Half finish grindes district 3 forms circular-arc retaining slurry line 5 jointly with the circumferential tooth that finish grindes district 4 in the wafer lapping machine surface; The center of circle of retaining slurry line 5 is positioned on the circle of abrasive disc; Radius of curvature equals the ring distance of abrasive disc inside and outside circle, and the position is with circle 32 five equilibriums in the abrasive disc, is the center of circle with each Along ent then.Abrasive disc has the secondary gradient, and wherein the first order gradient is positioned at broken section, and the gradient is 1:80, and the second level gradient is positioned at the corase grind section, and the gradient is 1:170.

Claims

1. level defibrator abrasive disc of big footpath more than 58 inches; The disk abrasive disc of forming by 8-12 sheet fan type abrasive disc; Every fan type abrasive disc is divided into fracture area, corase grind district, half correct grinding district and correct grinding district from the inside to the outside successively; Each zone all is made up of roll flute and circumferential tooth, and the 5-8mm gap is arranged between the adjacent area, and it is characterized in that: four zones of described abrasive disc are 3:2:2:3 along the radial direction length ratio; Each is distinguished roll flute inclination angle difference and is arithmetic progression and increases progressively, and tolerance is 8 °-13 °, and wherein roll flute inclination angle, correct grinding district is 0 °-5 °, and other zone increases progressively by arithmetic progression successively.

2. a kind of big footpath level defibrator abrasive disc more than 58 inches as claimed in claim 1; It is characterized in that: described half finish grindes the district forms circular-arc retaining slurry line jointly with the circumferential tooth that finish grindes the district in the wafer lapping machine surface; Retaining slurry curvature of a curve radius equals the ring distance of abrasive disc inside and outside circle, and the center of circle is positioned on the circle of abrasive disc.

3. a kind of big footpath level defibrator abrasive disc more than 58 inches as claimed in claim 2, it is characterized in that: half correct grinding district is with each Along ent behind the branches such as circle 28-32 in the abrasive disc with the home position of the retaining slurry line in correct grinding district.

4. a kind of big footpath level defibrator abrasive disc more than 58 inches as claimed in claim 1; It is characterized in that: described abrasive disc has the secondary gradient, and wherein the first order gradient is positioned at broken section, and the gradient is 1:100-150; The second level gradient is positioned at the corase grind section, and the gradient is 1:200-250.