CN210856769U

CN210856769U - Grinding disc of defibrator with larger crushing area

Info

Publication number: CN210856769U
Application number: CN201921570269.8U
Authority: CN
Inventors: 许威
Original assignee: Harbin University of Commerce
Current assignee: Harbin University of Commerce
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-06-26
Anticipated expiration: 2029-09-20

Abstract

The utility model belongs to the technical field of the wood-based plate machine-building, a defibrator grinding disc with great broken zone is related to, it is regional mainly concentrated on the correct grinding district to the grinding disc wearing and tearing inefficacy, the current situation that the wearing and tearing volume of broken zone gerar grinding is minimum is proposed, it includes the grinding disc body, the grinding disc body is the interior circle that sets up with one heart, the fan-shaped structure that forms between the excircle, the grinding disc body is equipped with broken zone from inside to outside, corase grind district and correct grinding district, all set up the gerar grinding in every district, be arranged with circumference tooth in corase grind district and correct grinding district, circumference tooth is located the tooth's socket that forms between every two adjacent gerar grinding teeth, the line of adjacent each circumference tooth forms curved fender thick liquid line, the ratio of length of broken zone, corase grind district and correct grinding district along grinding body radius direction is 5:3:4, the gerar grinding of broken zone comprises equidista. The utility model discloses an enlarge the proportion in broken district, reduce the degree of wear in correct grinding district when satisfying broken timber, the degree of wear of balanced each district gerar grinding.

Description

Grinding disc of defibrator with larger crushing area

The technical field is as follows:

the utility model belongs to the technical field of the wood-based plate machine-building, concretely relates to defibrator abrasive disc with great broken district.

Background art:

the fiber board is one of three major boards, has the advantages of smooth surface, good dimensional stability and the like, and is widely applied to industries such as buildings, panel furniture and the like. According to the statistical data of the national forestry bureau, the yield of the fiber board in China is more than 6000 million cubic meters in 2013 to 2018, and the highest annual yield reaches 6651.22 million cubic meters. The annual speed of fiberboard products in China is increased by 8.49 percent in the past decade, and the fiberboard products become the first major country for world fiberboard production.

The defibrator is the core device in the production of fiberboard, and the defibrator grinding disc is the key component of the defibrator for directly separating wood fiber. When the wood fiber is separated, the grinding plate is worn, and the friction frequency of the grinding plate in actual production is as high as 4000-. When the abrasion amount of the grinding sheet reaches a certain degree, the produced fiber quality can not meet the product requirement, the machine is stopped to replace a new grinding sheet, and the machine is stopped for 1 to 2 days every time the grinding sheet is replaced. The consumption of the grinding plate is huge for the wearing parts in the fiber production, and the investment cost for replacing the grinding plate is about 2-3 times of the purchase cost of the defibrator in the whole service life period of the defibrator. The method has the advantages that the loading condition of the abrasive disc is improved, the abrasive resistance of the abrasive disc is improved, and the service life of the abrasive disc is prolonged, so that the method is always a leading-edge subject and a hot point of research on fiber separation equipment, and is also a core content of a fiberboard production technology.

Researchers observe a large number of grinding sheets of the defibrator with failed wear, and find that the wear failure area of the grinding sheet with failed normal wear is mainly concentrated in the grinding area, the wear amount of the grinding teeth in the crushing area is minimum, and the grinding teeth in the crushing area of the grinding sheet with failed wear can still meet the production requirement; through grinding tests on wood raw materials with different crushing degrees, the method has the following discovery that: the greater the degree of breakage of the wood raw material entering the coarse grinding zone, the less the wear of the grinding teeth in the fine grinding zone and the lower the energy consumption during grinding, when obtaining the same quality and yield of fibres. Therefore, the abrasion condition of the grinding disc in the fine grinding area in the grinding process can be effectively improved by improving the crushing degree of the wood raw materials in the crushing area, so that the abrasion degree of each area of the grinding disc tends to be uniform, the service life of the grinding disc is prolonged, and the energy consumption in the grinding process is reduced. Therefore, a set of grinding plate with reasonable grinding tooth arrangement and long service life is urgently needed to be constructed, so that the defects of the existing grinding plate can be overcome, the fiber quality can be improved, the service life of the grinding plate is prolonged, and the energy consumption of the production of the fiberboard is reduced.

The utility model has the following contents:

the utility model provides an overcome above-mentioned defect, provide a defibrator grinding disc with great broken district, this grinding disc broken district accounts for than big, can fully broken timber raw materials, reduces the wearing and tearing volume of correct grinding district gerar grinding, makes each district gerar grinding wearing and tearing of grinding disc tend to the equilibrium, improves the fiber quality, extension grinding disc life reduces energy consumption in the defibration.

The utility model discloses a technical scheme lie in: a defibrator grinding disc with a larger crushing area comprises a grinding disc body, wherein the grinding disc body is of a fan-shaped structure formed between an inner circle and an outer circle which are concentrically arranged, the grinding disc body is sequentially provided with the crushing area, a coarse grinding area and a fine grinding area from inside to outside, grinding teeth are arranged in each area, circumferential teeth are further arranged in the coarse grinding area and the fine grinding area, the circumferential teeth are located in tooth grooves formed between every two adjacent grinding teeth, an arc-shaped pulp blocking line is formed by connecting lines of every two adjacent circumferential teeth, the ratio of the lengths of the crushing area, the coarse grinding area and the fine grinding area in the radius direction of the grinding disc body is 5:3:4, and the grinding teeth of the crushing area are composed of long teeth and short teeth which are alternately distributed at equal intervals.

Preferably, the inclination angle of the grinding teeth in the accurate grinding zone is 0-8 degrees, the inclination angle of the grinding teeth in the coarse grinding zone is 10-20 degrees, the inclination angle of the grinding teeth in the crushing zone is 25-40 degrees, the extension lines of the grinding teeth in the accurate grinding zone, the coarse grinding zone and the crushing zone and corresponding to the accurate grinding zone are respectively tangent to a tangent line circle which is concentrically arranged with the inner circle, the diameter of a tangent line circle of the grinding teeth in the accurate grinding zone is minimum, and the diameter of a tangent line circle of the grinding teeth in the crushing zone is maximum.

Preferably, the baffle lines distributed in the fine grinding area and the rough grinding area are positioned on an involute line with opposite grinding teeth in the area, the base circle and the inner circle of the involute line are arranged concentrically, the circumferential teeth distributed in the fine grinding area and the rough grinding area are distributed in a staggered mode, and the tooth height of the circumferential teeth is the same as that of the grinding teeth in the area.

Preferably, the number of the grinding teeth in the crushing area is even, the number of the long teeth is the same as that of the short teeth, and the length of the long teeth in the radial direction of the grinding plate is 2 times that of the short teeth in the radial direction of the grinding plate.

Preferably, the gap between the crushing area and the rough grinding area is 4-6 mm, and the gap between the rough grinding area and the fine grinding area is 3-5 mm.

Preferably, the tooth pitch between adjacent long teeth in the crushing zone is 25 mm-35 mm.

The utility model has the advantages that:

1. the utility model designs the ratio of the lengths of the crushing area, the rough grinding area and the fine grinding area along the radius direction of the grinding disc body to be 5:3:4 under the condition of fully considering the mechanical property of the wood raw material and the flow property of the fiber pulp, reduces the wear degree of the fine grinding area by enlarging the ratio of the crushing area while meeting the requirement of fully crushing the wood raw material, and leads the wear degree of the grinding teeth of each area on the grinding disc to tend to be balanced;

2. the distribution of the circumferential teeth of the utility model well combines the flow characteristic of the fiber pulp with the relationship between the dynamic pressure of the grinding teeth, can fully consider the contradiction between the size of the grinding disc and the grinding time, and prevent the problem that the fiber pulp is excessively ground or the fiber length is too long;

3. the utility model is suitable for a full-scale defibrator between 42 inches to 70 inches can show improvement fiber quality, extension abrasive disc life, reduces the energy consumption in the defibration, through experimental verification, under the same production technology condition, the utility model discloses the abrasive disc is compared with ordinary abrasive disc: can improve the quality of qualified fiber by 10-15%, prolong the service life of the abrasive disc by 35-40% and reduce the production energy consumption by 12-20%.

Description of the drawings:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the configuration of a grinding tooth tangent circle in the crushing zone;

FIG. 3 is a schematic structural diagram of a refining zone slurry baffle line on an involute curve;

wherein: 1 crushing zone, 2 rough grinding zone, 3 fine grinding zone, 4 grinding teeth, 5 inner circles, 6 outer circles, 7 circumferential teeth, 8 long teeth, 9 short teeth, 10 tangent circles and 11 involutes.

The specific implementation mode is as follows:

example 1

The present embodiment further describes the present invention by taking a 48 inch thermal mill as an example and the wood material is poplar.

As shown in figure 1, the utility model relates to a defibrator grinding disc with a larger crushing area, the grinding disc is a ring subarea grinding disc formed by splicing eight grinding disc bodies, each grinding disc body is a sector structure formed between an inner circle 5 and an outer circle 6 which are concentrically arranged, the grinding disc body is sequentially provided with three grinding areas, namely a crushing area 1, a rough grinding area 2 and a fine grinding area 3 from inside to outside, in order to improve the crushing degree of wood raw materials and reduce the abrasion of the fine grinding area, the ratio of the lengths of the crushing area 1, the rough grinding area 2 and the fine grinding area 3 along the radius direction of the grinding disc body is designed to be 5:3:4, gaps are left between the crushing area 1 and the rough grinding area 2 and between the rough grinding area 2 and the fine grinding area 3, because the poplar material is softer and the accumulation phenomenon at the transition part of each grinding area is not obvious, therefore, the gap between each grinding area can be a small value to increase the grinding area, the gap between the crushing area 1 and the rough grinding area, the gap between the rough grinding zone 2 and the fine grinding zone 3 was taken to be 3 mm.

At broken district 1, all be provided with gerar grinding 4 in corase grind district 2 and the accurate grinding district 3, the inclination of gerar grinding 4 in every district can be selected according to lapping body size and timber raw materials material, because 48 inches lapping size is less, grind the district area little, the grinding time is short, but the poplar material is softer, the fibre is easy to separate, consequently, broken district 1, the value of getting is good for the small value at the gerar grinding 4 inclination in corase grind district 2 and the

accurate grinding district

3, 3 are got to the inclination of gerar grinding 4 in the accurate grinding district 3, 12 are got to the inclination of gerar grinding in the corase grind district 2, 28 is got to the inclination of gerar grinding in broken district 1. As shown in fig. 2, the extension lines of the fine grinding zone 3, the rough grinding zone 2 and the crushing zone 1 and the corresponding grinding teeth 4 are respectively tangent to a tangent circle 10 which is concentric with the inner circle 5, the diameter of the tangent circle 10 of the grinding teeth 4 in the fine grinding zone 3 is the smallest, and the diameter of the tangent circle 10 of the grinding teeth 4 in the crushing zone 1 is the largest. As shown in fig. 3, the circumferential teeth 7 are further arranged in the rough grinding area 2 and the finish grinding area 3, the circumferential teeth 7 are located in tooth grooves formed between every two adjacent grinding teeth 4, a connecting line of every two adjacent circumferential teeth 7 forms an arc-shaped slurry blocking line, the slurry blocking line is located on a reverse involute 11 of the corresponding grinding tooth 4, a base circle of the involute 11 is arranged concentrically with the inner circle 5, the circumferential teeth 7 distributed in the finish grinding area 3 and the rough grinding area 2 are distributed in a staggered mode, and the tooth heights of the circumferential teeth 7 and the grinding teeth 4 in the finish grinding area 3 and the rough grinding area 2 are the same.

The grinding teeth 4 of the crushing zone 1 are composed of long teeth 8 and short teeth 9 which are alternately distributed at equal intervals, the number of the grinding teeth 4 in the crushing zone 1 is even, and the length of the long teeth 8 in the radial direction of the grinding plate is 2 times that of the short teeth in the radial direction of the grinding plate. The pitch between the long teeth at the 5-position of the inner circle is 25-35 mm. Because the wood raw material of abrasive disc body processing is the poplar material, its fibre is easy to separate, consequently, the tooth pitch that the interior circle 5 was located between the long tooth 8 can take big value, and for example the tooth pitch takes 32 mm.

Example 2

Example 2 differs from the wood material selected in example 1, which is further described by taking fraxinus mandshurica as an example.

In the embodiment, the length ratio of the crushing zone 1, the rough grinding zone 2 and the fine grinding zone 3 along the radius direction of the grinding plate body is still 5:3:4, and the ash is harder and has obvious accumulation at the transition between the crushing zone 1 and the rough grinding zone 2 and between the rough grinding zone 2 and the fine grinding zone 3, so the gap between the grinding zones is large to prevent the accumulation at the transition of the grinding zones, the gap between the crushing zone 1 and the rough grinding zone 2 is 6mm, and the gap between the rough grinding zone 2 and the fine grinding zone 3 is 5 mm.

Because 48 inches abrasive disc size is less, and the grinding district area is little, and the grinding time is short, but the ash willow material is harder, and the difficult separation of fibre, therefore, the big value should be taken to the gerar 4 inclination in broken district 1, corase grind district 2 and the correct grinding district 3, and the angle of inclination of gerar 4 in the correct grinding district 3 can be taken 6, and the angle of inclination of gerar in the corase grind district 2 can be taken 16, and the angle of inclination of gerar in broken district 1 can be taken 34. The extension lines of the accurate grinding zone 3, the rough grinding zone 2 and the crushing zone 1 and the corresponding grinding teeth 4 are respectively tangent to a tangent circle 10 concentrically arranged with the inner circle 5, the diameter of the tangent circle 10 of the grinding teeth 4 in the accurate grinding zone 3 is the smallest, and the diameter of the tangent circle 10 of the grinding teeth 4 in the crushing zone 1 is the largest. Still arranged circumference tooth 7 in coarse grinding district 2 and accurate grinding district 3, circumference tooth 7 is located the tooth's socket that forms between every two adjacent grinding teeth 4, and the line of adjacent each circumference tooth 7 forms curved fender thick liquid line, fender thick liquid line is located rather than corresponding grinding teeth 4 reverse involute 11 on, this involute 11's base circle and interior circle 5 concentric settings, distribute and be the alternating expression between the circumference tooth 7 in accurate grinding district 3 and the coarse grinding district 2 and distribute, and the circumference tooth 7 in accurate grinding district 3 and the coarse grinding district 2 is the same with the tooth height homoenergetic of grinding teeth 4.

The grinding teeth 4 of the crushing zone 1 are composed of long teeth 8 and short teeth 9 which are alternately distributed at equal intervals, the number of the grinding teeth 4 in the crushing zone 1 is even, and the length of the long teeth 8 in the radial direction of the grinding plate is 2 times that of the short teeth 9 in the radial direction of the grinding plate. Because the wood raw material of the grinding sheet body processing is the fraxinus mandshurica material, the fiber is difficult to separate, therefore, the tooth pitch between the long teeth 8 at the inner circle 5 should be small, for example, the tooth pitch is 28 mm.

The above description is only the preferred embodiments of the present invention, and these embodiments are all based on the different implementation manners of the present invention, in the above embodiments, as long as the technical solution of the present invention can be arranged and combined, and the protection scope of the present invention is not limited thereto, and any changes or replacements that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A refiner plate with a larger crushing zone comprises a refiner plate body, the refiner plate body is a sector structure formed between an inner circle (5) and an outer circle (6) which are concentrically arranged, the refiner plate body is sequentially provided with a crushing zone (1), a rough grinding zone (2) and a fine grinding zone (3) from inside to outside, grinding teeth (4) are arranged in each zone, circumferential teeth (7) are arranged in the rough grinding zone (2) and the fine grinding zone (3), the circumferential teeth (7) are positioned in tooth grooves formed between every two adjacent grinding teeth (4), and the connecting line of every two adjacent circumferential teeth (7) forms an arc-shaped slurry blocking line, characterized in that the ratio of the lengths of the crushing zone (1), the rough grinding zone (2) and the fine grinding zone (3) in the radius direction of the grinding plate body is 5:3:4, the grinding teeth (4) of the crushing zone (1) are composed of long teeth (8) and short teeth (9) which are distributed alternately at equal intervals.

2. A refiner plate having a larger crushing zone according to claim 1 wherein: the inclination angle of the grinding teeth (4) in the accurate grinding zone (3) is 0-8 degrees, the inclination angle of the grinding teeth (4) in the coarse grinding zone (2) is 10-20 degrees, the inclination angle of the grinding teeth (4) in the crushing zone (1) is 25-40 degrees, the extension lines of the grinding teeth (4) in the accurate grinding zone (3), the coarse grinding zone (2) and the crushing zone (1) corresponding to the accurate grinding zone are respectively tangent to a tangent circle concentrically arranged with the inner circle (5), the diameter of a tangent circle of the grinding teeth (4) in the accurate grinding zone (3) is minimum, and the diameter of a tangent circle of the grinding teeth (4) in the crushing zone (1) is maximum.

3. A refiner plate having a larger crushing zone according to claim 2 wherein: the slurry blocking lines distributed in the fine grinding area (3) and the rough grinding area (2) are positioned on the involute lines of the grinding teeth (4) in the areas where the slurry blocking lines are positioned, the base circles of the involute lines and the inner circles (5) are concentrically arranged, the circumferential teeth (7) distributed in the fine grinding area (3) and the rough grinding area (2) are distributed in a staggered mode, and the tooth height of the circumferential teeth (7) is the same as that of the grinding teeth (4) in the areas where the circumferential teeth are positioned.

4. A refiner plate having a larger crushing zone according to claim 1 wherein: the grinding teeth (4) in the crushing zone (1) are even in number, the long teeth (8) and the short teeth (9) are the same in number, and the length of the long teeth (8) in the radial direction of the grinding sheet is 2 times that of the short teeth (9) in the radial direction of the grinding sheet.

5. A refiner plate having a larger crushing zone according to claim 1 wherein: the gap between the crushing area (1) and the coarse grinding area (2) is 4-6 mm, and the gap between the coarse grinding area (2) and the fine grinding area (3) is 3-5 mm.

6. A refiner plate having a larger crushing zone according to claim 1 wherein: the pitch between adjacent long teeth (8) in the crushing zone (1) is 25-35 mm.