CN113696293B - Defibrator grinding disc design method based on theoretical optimal value of fiber length - Google Patents

Defibrator grinding disc design method based on theoretical optimal value of fiber length Download PDF

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CN113696293B
CN113696293B CN202111047562.8A CN202111047562A CN113696293B CN 113696293 B CN113696293 B CN 113696293B CN 202111047562 A CN202111047562 A CN 202111047562A CN 113696293 B CN113696293 B CN 113696293B
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grinding
subarea
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CN113696293A (en
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许威
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Harbin University of Commerce
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing

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Abstract

A method for designing a grinding sheet of a defibrator based on a theoretical optimal value of fiber length belongs to the technical field of grinding sheet design of the defibrator. The problems that grinding and dissociating progressive effects of all grinding areas of the grinding sheet in the existing design are unreasonable, so that the grinding sheet is not abraded uniformly, the service life is shortened, and the qualified rate of produced fibers is low are solved. The technical points are as follows: step 1: calculating the radial length of each subarea of the abrasive disc; step 2: calculating theoretical optimal values of fiber lengths of all the regions of the abrasive disc; determining the initial calculation number of theoretical optimal values of the fiber length of each subarea; determining the radial displacement of each initial value of the theoretical optimal value of the fiber length of each subarea; calculating the initial value of the theoretical optimal value of the fiber length of each subarea; calculating the theoretical optimal value of the fiber length of each subarea; and step 3: and determining the tooth profile structure parameters of each subarea of the grinding sheet. The grinding sheet designed according to the design method of the invention has high matching degree with wood raw materials of a fiberboard plant, the progressive grinding action of each grinding area of the grinding sheet is reasonable, the abrasion of each grinding area is uniform, the service life is long, and the qualification rate of produced fibers is high.

Description

Defibrator grinding disc design method based on theoretical optimal value of fiber length
Technical Field
The invention relates to a method for designing a grinding sheet of a defibrator, in particular to a method for designing a grinding sheet of a defibrator based on a theoretical optimal value of fiber length, and belongs to the technical field of grinding sheet design of the defibrator.
Background
The refiner plate of the defibrator is a key part for the defibrator to directly separate wood fiber, and directly influences the separation quality and the separation energy consumption of the fiber. Foreign manufacturers of the grinding plates of the defibrator deeply research the defibrator theory, establish a perfect wood raw material mechanical property database, completely master the influence relation between the setting of the tooth-shaped structural parameters of the grinding plates and the change of the geometric forms of wood fibers in the grinding process, form a perfect tooth-shaped structural parameter design theory of the defibrator grinding plates, and can carry out the customization design of the defibrator grinding plates according to the actual conditions of the defibrator plant. According to the types and the proportion of raw materials of a fiberboard production plant, the requirements of practical use of fiberboard products are combined, namely the requirements on the length or the diameter size of qualified fibers, the tooth-shaped structure of the grinding sheet of the defibrator, which is most suitable and accords with the existing defibrator of the fiberboard plant, can be designed, so that the matching degree of the grinding sheet and the raw materials of the plant is highest, the progressive effect of grinding and dissociation of each grinding area is reasonable, the grinding sheet is uniform in wear and long in service life, the yield of the produced fibers is high, the geometric size of the qualified fibers meets the requirements of the practical use of the fiberboard products, the energy consumption of the qualified fibers in unit mass production is low, the cost is low, and the market competitiveness of the fiberboard products is greatly increased.
As the research of the defibrator equipment in China starts late, the mode of selecting the grinding disc in each fiberboard factory is to select one grinding disc from the traditional mainstream grinding discs according to the size of the defibrator grinding disc in the factory. Therefore, the grinding plate of the defibrator of the same type is used by the defibrator in different regions, but the types and the proportions of the wood raw materials used by the defibrator in different regions are greatly different. The main principle of selecting wood raw materials in a fiberboard plant is a near low-cost principle, namely, the wood raw materials used by artificial board plants producing fiberboard products of the same specification in different regions have great differences in the types and proportions by mainly taking trees with large planting amount or low transportation price in forest farms near the fiberboard plant as main materials and leftover materials and the like left after processing the wood products such as furniture and the like as auxiliary materials. This results in the quality of the qualified fiber produced by different fiber board factories to produce fiber board products of the same specification being uneven, and the market competitiveness of the fiber board products is poor, which is one of the obstacles that the fiber board products in China are difficult to go out of China.
The existing method for designing the tooth-shaped structure of the grinding sheet of the defibrator mainly combines the tooth-shaped structure parameters of all grinding areas mechanically according to the influence of the tooth-shaped structure parameters of the grinding sheet on the dissociation of fibers and experience, and the combination mode mainly depends on the size of the grinding sheet without considering the actual application requirements of fiberboard products, namely, an effective coupling corresponding relation is not established among wood raw materials, the tooth-shaped structure parameters of the grinding sheet and the geometric dimension of qualified fibers; the reasonability of the progressive grinding dissociation effect of each grinding area of the grinding sheet is not comprehensively considered, and the matching degree between the tooth-shaped structure parameter setting of each grinding area of the grinding sheet and the fiber form change is neglected; the progressive effect of the grinding dissociation of each grinding area of the grinding sheet is unreasonable, so that the grinding sheet is extremely uneven in wear, the service life of the grinding sheet is greatly shortened, and the produced fibers are low in percent of pass. Therefore, there is a need for a method for designing a refiner plate of a defibrator, which can perform a 'design-by-measure' design of the refiner plate structure of the defibrator according to the actual conditions of the defibrator, the performance requirements of the defibrator, etc., so as to overcome the shortcomings of the existing design methods, improve the fiber quality, prolong the service life of the refiner plate, reduce the production cost of the defibrator and increase the market competitiveness of the defibrator.
Disclosure of Invention
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
In view of the above, the invention designs a method for designing a grinding sheet of a defibrator based on a theoretical optimal value of fiber length, which can design the grinding sheet of the defibrator according to the actual conditions of a fiberboard plant and the actual requirements of fiberboard products, and aims to solve the problems that the grinding and dissociating progressive action of each grinding area of the conventional designed grinding sheet is unreasonable, so that the grinding sheet is extremely uneven in wear, the service life of the grinding sheet is greatly reduced, and the qualification rate of produced fibers is low.
In order to achieve the purpose, the invention discloses a method for designing a refiner plate of a defibrator based on a theoretical optimal value of fiber length, which comprises the following specific steps:
step 1: calculating the radial length of each section of the grinding sheet
S11, determining the number of the section of the grinding sheet;
s12, determining the radial length ratio of each subarea of the grinding sheet;
s13, preliminarily calculating the radial length of each subarea of the grinding sheet;
s14, verifying the rationality of the radial length of each section of the grinding sheet;
if the radial grade difference gamma of the grinding disc subareas is more than or equal to 0, the radial length of each subarea of the grinding disc is reasonably distributed; if the radial grade difference gamma of the sections of the grinding disc is less than 0, the radial length of each section of the grinding disc is unreasonably distributed, and the steps S12-S14 are repeated to determine the radial length of each section again;
s15, determining the final value of the radial length of each section of the grinding sheet;
step 2: calculating theoretical optimal value of fiber length of each subarea of abrasive disc
S21, determining the calculation quantity of theoretical optimal values of the fiber length of each subarea of the abrasive disc;
s22, determining the radial displacement of each initial value of the theoretical optimal value of the fiber length of each section of the grinding sheet;
s23, calculating the theoretical optimal value of the fiber length of each subarea of the abrasive disc;
s24, calculating the theoretical optimal value of the fiber length of each subarea of the abrasive disc;
and step 3: determining tooth profile structure parameters of each subarea of grinding sheet
S31, determining gaps of each section of the grinding sheet;
s32, determining the tooth grinding width of each subarea of the grinding sheet;
s33, determining the number of grinding teeth of each subarea of the grinding sheet;
s34, determining the inclination angle of the grinding teeth of each subarea of the grinding sheet;
s35, determining the width of each section tooth groove of the grinding sheet;
s36, determining the grinding tooth height of the grinding plate;
s37, determining the tooth width of the grinding sheet circumferential teeth;
s38 determining the blade circumferential tooth height.
Further: s11, determining the number of the grinding sheet partitions, specifically:
Figure GDA0003562032350000031
in the formula, QfRounding off to give an integer QfWhen the value is more than or equal to 4, taking Qf4, unit: a, DwThe diameter of the excircle of the grinding piece is as follows: mm.
Further: s12, determining the radial length ratio of each section of the grinding sheet, specifically:
Figure GDA0003562032350000032
in the formula (I), the compound is shown in the specification,
Figure GDA0003562032350000033
the radial length of each subarea from the excircle to the inner circle of the grinding sheet is respectively as follows: mm;
Figure GDA0003562032350000034
the radial length of each subarea from the excircle to the inner circle of the grinding sheet is respectively a proportional value, and the values are integers and range from 3 to 6.
Further: s13 preliminary calculation of the radial length of each subarea of the grinding sheet specifically includes:
Figure GDA0003562032350000035
in the formula (I), the compound is shown in the specification,
Figure GDA0003562032350000036
taking integers, unit: mm, DnDiameter of inner circle of grinding piece, unit: mm.
Further: s14 verifies the rationality of the radial length of each section of the grinding sheet, and specifically comprises the following steps:
Figure GDA0003562032350000037
in the formula, gamma is the radial level difference of the grinding disc subareas, and if gamma is more than or equal to 0, the radial length of each subarea of the grinding disc is reasonably distributed; if gamma is less than 0, the radial length distribution of each subarea of the grinding sheet is unreasonable, and the steps S12-S14 are repeated to determine the radial length of each subarea again.
Further: s15, determining the final radial length value of each section of the grinding sheet, specifically:
Figure GDA0003562032350000041
in the formula, LfziThe radial length final value of the ith subarea of the grinding sheet is represented by the following unit: mm.
Further: s21, determining the initial calculation number of the theoretical optimal value of the fiber length of each subarea of the abrasive disc, specifically:
Figure GDA0003562032350000042
in the formula, QxwciCalculating the quantity, Q, of theoretical optimal values of the fiber lengths of the ith subarea of the abrasive discxwciRounding off is an integer, unit: when Q is greater thanxwci>At the time of 5, the water-soluble organic acid,get Qxwci＝5。
Further: s22, determining the radial displacement of each initial value of the theoretical optimal value of the fiber length of each section of the grinding sheet, specifically:
Figure GDA0003562032350000043
in the formula, LmplijTaking an integer and a unit for the theoretical optimal value initial value radial displacement of the jth fiber length of the ith subarea of the grinding sheet: mm, i ═ 1, 2, · Qf，j＝1、2、...、QxwciAnd let Lfz0＝0；ηiIs a constant integer, ηi＝5～10。
Further: s23, calculating the theoretical optimal value initial value of the fiber length of each subarea of the abrasive disc, specifically:
Figure GDA0003562032350000044
in the formula IxwLijFor each section of the grinding disc with a radial displacement of LmplijThe theoretical optimal value of the fiber length is as follows, unit: mm; l isYCIs the average value of the maximum linear dimension of the wood raw material, and the unit is as follows: mm, LhgIn order to meet the qualified fiber length of the fiber board product performance requirement, the unit is as follows: mm; sigmalThe grinding strength of the grinding plate is obtained.
Further: s24, calculating the theoretical optimal value of the fiber length of each subarea of the abrasive disc, specifically:
Figure GDA0003562032350000045
in the formula (I), the compound is shown in the specification,
Figure GDA0003562032350000046
the theoretical optimal value of the fiber length of the ith subarea of the grinding sheet is as follows: mm.
Further: s31, determining gaps of each section of the grinding sheet, specifically:
τi(i+1)＝δf(i+1) (i＝1、2、...、Qf-1)
in the formula, τi(i+1)Is the gap between the ith and (i + 1) th sub-zones of the grinding sheeti(i+1)Is located in the ith section of the grinding sheet when taui(i+1)When t is more than or equal to 5, taking tau i(i+1)5, unit: mm.
Further: s32, determining the tooth grinding width of each subarea of the grinding disc, specifically:
Figure GDA0003562032350000051
in the formula, BckiFor the grinding tooth width of the ith subarea of the grinding plate, rounding off is carried out to obtain an integer, and the unit is as follows: mm; mu is a tooth width coefficient, and mu is 0.4-0.9.
Further: s33, determining the number of teeth of each subarea of the grinding sheet, specifically:
Figure GDA0003562032350000052
in the formula, niNumber of grinding teeth for i-th section of grinding disc, niRounding to the nearest integer divisible by 6, unit: a plurality of; lambda [ alpha ]iIs a regional coefficient when i is 1, 2fAt-1, λiWhen i is equal to QfWhen is lambdai＝2。
Further: s34, determining the inclination angle of the grinding teeth of each subarea of the grinding sheet, specifically:
Figure GDA0003562032350000053
in the formula, alphaiFor the grinding tooth inclination angle of the ith subarea of the grinding sheet, rounding off the inclination angle to obtain an integer with the unit: degree; zeta is the correction coefficient of the grinding tooth inclination angle, and zeta is-6 degrees to +6 degrees.
Further: s35 determining the width of each section tooth groove of the grinding sheet, which specifically comprises the following steps:
Figure GDA0003562032350000054
further: s36, determining the grinding tooth height of the grinding plate, specifically:
Figure GDA0003562032350000055
in the formula, HmcTaking an integer and a unit: mm;
Figure GDA0003562032350000061
for the tooth-height correction factor,
Figure GDA0003562032350000062
unit: mm;
further: s37 determining the tooth width of the grinding disc circumferential teeth, specifically:
Bzcki＝Bcki(i＝1、2、...、Qf)。
further: s38 determining the tooth height of the grinding disc in the circumferential direction, specifically:
Figure GDA0003562032350000063
in the formula, HzmciAnd (3) the circumferential tooth height of the ith subarea of the grinding sheet is rounded and reserved with one decimal, unit: mm.
The above numerical values are used as an example of the application of the present application to facilitate the explanation of the control method and steps of the present application, and the scope of the present application is not limited to the above numerical ranges.
The invention achieves the following effects:
(1) the change rule of the length size decomposition of the wood raw material in the grinding and dissociation process of the wood raw material is completely determined by the setting of the tooth-shaped structure parameters of the grinding sheet. The performance of the abrasive sheet is directly reflected on the rationality of the change rule of the fiber form, namely the rationality of the change of the length dimension. The method for designing the grinding sheet determines the theoretical optimal value of the fiber length size of each grinding area of the grinding sheet in the grinding process according to the size of the grinding sheet, the grinding strength of the grinding sheet, the size of wood raw materials, the qualified fiber length required by a fiberboard product and the like, and deduces the tooth-shaped structure parameters of each grinding area of the grinding sheet by taking the theoretical optimal value of the fiber length size of each grinding area of the grinding sheet in the grinding process as a basic parameter and combining the size of the grinding sheet, the grinding strength of the grinding sheet, the physical and mechanical properties of the wood raw materials and the like. The design method establishes an effective coupling corresponding relation among the mechanical properties and the sizes of the wood raw materials, the setting of the tooth-shaped structure parameters of the grinding disc and the geometric sizes of the qualified fibers, the matching degree of the designed tooth-shaped structure parameters of the grinding disc and the change rule of the longitudinal decomposition form of the fibers in the grinding process is high, and the progressive action of each grinding area of the grinding disc is reasonable.
(2) The grinding plate designed by the grinding plate design method can grind the fibers in the grinding areas to a proper form, and the form change of the fibers in the grinding areas is reasonable, so that the grinding areas of the grinding plate are uniformly worn, the service life of the grinding plate is long, the energy consumption in the grinding process is low, and the qualification rate of the produced fibers is high.
Drawings
FIG. 1 is a flow chart of a design method of the present invention;
FIG. 2 is a schematic view of a blade tooth profile designed according to the design method of the present invention;
FIG. 3 is a schematic illustration of a comparative abrasive sheet construction;
FIG. 4 is a graph comparing fiber lengths;
FIG. 5 is a graph of fiber fractions for each type.
Detailed Description
Exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted. Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.
The grinding sheet of the defibrator is matched with the annual output of 20 ten thousand meters3The fiber board production line has the main motor power of the defibrator of 4000kW and the main shaft rotating speed of 1500 r/min; the raw material of the defibrator is a mixed raw material of white pine and poplar, the mixing ratio is about 2:1, the mixed raw material contains about 3 percent of bark and a small amount of hardwood leftover, the average value of the maximum linear dimension of the mixed raw material of the white pine and the poplar is about 25mm, and the average value of the qualified fiber length of a fiberboard product is required to be Lhg2.8 mm; the refiner used a plate size of 54 inch, with an outer diameter of about 1372mm and an inner diameter of about 660mm, and a plate grinding strength of 1.863.
The design steps are as follows:
referring to fig. 1, the method for designing the tooth profile structure of the grinding blade of the defibrator in the present embodiment comprises the following steps:
a method for designing a refiner plate of a defibrator based on a theoretical optimal value of fiber length comprises the following steps:
s1: calculating the radial length of each section of the grinding sheet
S11: determining the number of the grinding plate sections:
Figure GDA0003562032350000071
in the formula, QfRounding off to give an integer QfWhen the value is more than or equal to 4, taking Qf4, unit: grinding the excircle diameter Dw1372 mm;
s12: determining the radial length ratio of each subarea of the grinding sheet:
Lf1:Lf2:Lf3:Lf4＝δf1:δf2:δf3:δf4＝4:3:3:5
in the formula, Lf1、Lf2、Lf3、Lf4The radial length of each subarea from the excircle to the inner circle of the grinding sheet is respectively as follows: mm; deltaf1、δf2、δf3、δf4The proportion values of the radial lengths of all the subareas from the excircle to the inner circle of the grinding plate are respectively, as the wood raw material mainly comprises white pine and poplar, the whole mechanical property is soft, the grinding dissociation strength is moderate, and the proportion of the crushing area and the fine grinding area can be properly increased for uniform abrasion of all the grinding areas of the grinding plate, so that the delta is takenf1＝4，δf2＝3，δf3＝3，δf4＝5；
S13: preliminarily calculating the radial length of each subarea of the grinding sheet:
Figure GDA0003562032350000081
Figure GDA0003562032350000082
Figure GDA0003562032350000083
Figure GDA0003562032350000084
in the formula (I), the compound is shown in the specification,
Figure GDA0003562032350000085
taking integers, unit: mm, diameter of inner circle of grinding sheet DnIs 660 mm;
s14: verifying the rationality of the radial length of each section of the grinding sheet:
Figure GDA0003562032350000086
in the formula, the radial level difference gamma of each section of the grinding sheet is greater than 0, so that the radial length value of each section of the grinding sheet is reasonably distributed;
s15: determining the final value of the radial length of each section of the grinding sheet:
Lfz1＝95mm
Lfz2＝70mm
Lfz3＝70mm
Lfz4＝121mm
s2: calculating theoretical optimal value of fiber length of each subarea of abrasive disc
S21: determining the initial calculation number of theoretical optimal values of the fiber lengths of all the sections of the abrasive disc:
Figure GDA0003562032350000087
Figure GDA0003562032350000091
Figure GDA0003562032350000092
Figure GDA0003562032350000093
s22: determining the radial displacement of each initial value of the theoretical optimal value of the fiber length of each section of the grinding sheet:
Figure GDA0003562032350000094
Figure GDA0003562032350000095
Figure GDA0003562032350000096
Figure GDA0003562032350000097
Figure GDA0003562032350000098
Figure GDA0003562032350000099
Figure GDA00035620323500000910
Figure GDA00035620323500000911
Figure GDA00035620323500000912
Figure GDA00035620323500000913
Figure GDA00035620323500000914
Figure GDA0003562032350000101
Figure GDA0003562032350000102
Figure GDA0003562032350000103
Figure GDA0003562032350000104
Figure GDA0003562032350000105
Figure GDA0003562032350000106
Figure GDA0003562032350000107
in the formula, LmplijTaking an integer and a unit for the theoretical optimal value initial value radial displacement of the jth fiber length of the ith subarea of the grinding sheet: mm, i ═ 1, 2, · Qf，j＝1、2、...、QxwciAnd let L fz00; normal integer ηiTaking values according to the proportional relation of the radial length of each partition of the abrasive disc, and respectively taking eta1＝7、η2＝5、η3＝5、η4＝8；
S23: calculating the theoretical optimal value initial value of the fiber length of each subarea of the abrasive disc:
Figure GDA0003562032350000108
Figure GDA0003562032350000109
Figure GDA00035620323500001010
Figure GDA00035620323500001011
Figure GDA0003562032350000111
Figure GDA0003562032350000112
Figure GDA0003562032350000113
Figure GDA0003562032350000114
Figure GDA0003562032350000115
Figure GDA0003562032350000116
Figure GDA0003562032350000117
Figure GDA0003562032350000118
Figure GDA0003562032350000119
Figure GDA00035620323500001110
Figure GDA00035620323500001111
Figure GDA0003562032350000121
Figure GDA0003562032350000122
Figure GDA0003562032350000123
in the formula IxwLijFor each section of the grinding disc with a radial displacement of LmplijThe theoretical optimal value of the fiber length is as follows, unit: mm; mean value of maximum linear dimensions L of wood raw materialYCIs 25mm, and meets the qualified fiber length L of the product performance requirement of the fiber boardhg2.8mm, grinding intensity sigma of grinding piecel1.863;
s24: calculating theoretical optimal values of fiber lengths of all the sections of the abrasive disc:
Figure GDA0003562032350000124
Figure GDA0003562032350000125
Figure GDA0003562032350000126
Figure GDA0003562032350000127
in the formula (I), the compound is shown in the specification,
Figure GDA0003562032350000128
the theoretical optimal value of the fiber length of the ith subarea of the grinding sheet is as follows: mm;
s3: determining tooth profile structure parameters of each subarea of grinding sheet
S31: determining gaps of all sections of the grinding sheet:
τ12＝δf2＝3mm
τ23＝δf3＝3mm
τ34＝δf4＝5mm
in the formula, τi(i+1)Is the gap between the ith and (i + 1) th sub-zones of the grinding sheeti(i+1)Is located in the ith section of the grinding sheet when taui(i+1)When t is more than or equal to 5, taking tau i(i+1)5, unit: mm;
s32: determining the tooth grinding width of each subarea of the grinding sheet:
Bck1＝0.6×1.863×3.773≈4.219≈4mm
Bck2＝0.6×1.863×6.34≈7.087≈7mm
Bck3＝0.6×1.863×8.508≈9.510≈10mm
Bck4＝0.6×1.863×11.41≈12.754≈13mm
in the formula, BckiFor the grinding tooth width of the ith subarea of the grinding plate, rounding off is carried out to obtain an integer, and the unit is as follows: mm; in the embodiment, the grinding sheet has larger size, but the mechanical strength of the wood raw material is low, so mu can be a larger value in the middle, and mu is 0.6;
s33: determining the number of grinding teeth of each section of the grinding sheet:
Figure GDA0003562032350000131
Figure GDA0003562032350000132
Figure GDA0003562032350000133
Figure GDA0003562032350000134
in the formula, niNumber of grinding teeth for i-th section of grinding disc, niRounding to the nearest integer divisible by 6, unit: a plurality of; lambda [ alpha ]iIs a regional coefficient, λ1＝λ2＝λ3＝1，λ4＝2；
S34: determining the inclination angle of grinding teeth of each subarea of the grinding sheet:
α1＝5°
Figure GDA0003562032350000135
Figure GDA0003562032350000136
Figure GDA0003562032350000137
in the formula, alphaiFor the grinding tooth inclination angle of the ith subarea of the grinding sheet, rounding off the inclination angle to obtain an integer with the unit: degree; zeta is the correction coefficient of the inclination angle of the grinding teeth, and the size of the grinding sheet and the mechanical property alpha of the wood raw material are comprehensively considered1Take the median value to 5 ° and do not require correction of the tooth rake angle, ζ＝0°；
S35: determining the width of each section tooth groove of the grinding sheet:
Figure GDA0003562032350000141
Figure GDA0003562032350000142
Figure GDA0003562032350000143
Figure GDA0003562032350000144
s36: determining the grinding tooth height of the grinding plate:
Hmc＝4×1.863+0＝7.452≈7mm
in the formula, HmcTaking an integer and a unit: mm;
Figure GDA0003562032350000145
for the tooth-height correction factor,
Figure GDA0003562032350000146
s37: determining the tooth width of the grinding sheet circumferential teeth:
Bzck1＝Bck1＝4mm
Bzck2＝Bck2＝7mm
Bzck3＝Bck3＝10mm
Bzck4＝Bck4＝13mm
s38: determining the tooth height of the circumferential teeth of the grinding sheet:
Hzmc1＝Hzmc2＝Hzmc3＝7.0mm
Figure GDA0003562032350000151
in the formula, HzmciAnd (3) the circumferential tooth height of the ith subarea of the grinding sheet is rounded and reserved with one decimal, unit: mm;
a schematic view of the blade structure according to the calculated blade structure parameters is shown in fig. 2.
Experiments require that the wood raw materials are washed before entering the grinding area, impurities such as hard particles in the wood raw materials are removed, other impurities do not exist in the raw materials, and the grinding plate can be guaranteed to be worn normally and lose efficacy.
And in the normal wear stage of the grinding plates, collecting fiber samples, and collecting 200 fiber samples for statistical analysis in each grinding plate. The qualified fiber length meeting the mechanical property requirement of the fiber board according to the design requirement is 2.8mm, therefore, the collected fiber samples are divided into three types by taking +/-20% of the qualified fiber length as the screening value of the fiber samples, namely: long fibers (> 3.36mm for 2.8 × 120%), regular fibers (2.8 × 80 ═ 2.24-2.8 × 120 ═ 3.36mm), and short fibers (<2.8 × 80 ═ 2.24 mm). The statistical results of designing the refiner plate (shown in figure 2) and the comparative refiner plate (shown in figure 3) to produce fibers are shown in figures 4 and 5. As can be seen from the statistical results, the average value of the qualified fiber length produced by the grinding plate designed according to the design method is 2.89mm, the number of qualified fiber samples accounts for 83% of the total number of the experimental samples, while the average value of the qualified fiber length produced by the comparative grinding plate is 3.05mm, and the number of qualified fiber samples accounts for 53% of the total number of the experimental samples, so that the quality of the fiber produced by the designed grinding plate is high, and the proportion of the qualified fiber is also high.
Experiments prove that the average service life of the abrasive disc designed by the design method in normal wear failure is about 26d, the average service life of the abrasive disc in China is 12d, and the price of the abrasive disc is about 1.5 ten thousand yuan/set (Wujiang, Pandongjie, Huang Lian Tung group and the like, research and application and development of the abrasive disc of a heat grinder in China [ J ] casting technology, 2015,36 (10): 2443 and 2447 ]. Therefore, the average service life of normal wear of the grinding plate designed by the design method is about 2.17 times longer than that of the existing domestic grinding plate, about 16 sets of grinding plates can be replaced less one year, and the purchase cost of the grinding plate is saved by about 16 sets of grinding plates multiplied by 1.5 ten thousand yuan/set which is 24 ten thousand yuan; the downtime for replacing one set of grinding disc of the defibrator is about 6h, so that the downtime for replacing the grinding disc can be reduced by about 16 sets multiplied by 6 h/set which is about 96h per year, the profit can be generated by about 1.2 ten thousand yuan per 1h saved, and the profit for saving the time per year is about 96h multiplied by 1.2 ten thousand yuan/h which is about 115.2 ten thousand yuan.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A method for designing a refiner plate of a defibrator based on a theoretical optimal value of fiber length is characterized by comprising the following steps:
step 1: calculating the radial length of each section of the grinding sheet
S11, determining the number of the section of the grinding sheet;
s12, determining the radial length ratio of each subarea of the grinding sheet;
s13, preliminarily calculating the radial length of each subarea of the grinding sheet;
s14, verifying the rationality of the radial length of each section of the grinding sheet;
if the radial grade difference gamma of the grinding disc subareas is more than or equal to 0, the radial length of each subarea of the grinding disc is reasonably distributed; if the radial grade difference gamma of the sections of the grinding disc is less than 0, the radial length of each section of the grinding disc is unreasonably distributed, and the steps S12-S14 are repeated to determine the radial length of each section again;
s15, determining the final value of the radial length of each section of the grinding sheet;
step 2: calculating theoretical optimal value of fiber length of each subarea of abrasive disc
S21, determining the calculation quantity of theoretical optimal values of the fiber length of each subarea of the abrasive disc;
s22, determining the radial displacement of each initial value of the theoretical optimal value of the fiber length of each section of the grinding sheet;
s23, calculating the theoretical optimal value of the fiber length of each subarea of the abrasive disc;
s24, calculating the theoretical optimal value of the fiber length of each subarea of the abrasive disc;
and step 3: determining tooth profile structure parameters of each subarea of grinding sheet
S31, determining gaps of each section of the grinding sheet;
s32, determining the tooth grinding width of each subarea of the grinding sheet;
s33, determining the number of grinding teeth of each subarea of the grinding sheet;
s34, determining the inclination angle of the grinding teeth of each subarea of the grinding sheet;
s35, determining the width of each section tooth groove of the grinding sheet;
s36, determining the grinding tooth height of the grinding plate;
s37, determining the tooth width of the grinding sheet circumferential teeth;
s38 determining the blade circumferential tooth height.
2. A method according to claim 1, wherein S11 is used to determine the number of blade sections, specifically:
Figure FDA0003562032340000011
in the formula, QfRounding off to give an integer QfWhen the value is more than or equal to 4, taking Qf4, unit: a, DwThe diameter of the excircle of the grinding piece is as follows: mm;
s12, determining the radial length ratio of each section of the grinding sheet, specifically:
Figure FDA0003562032340000021
in the formula (I), the compound is shown in the specification,
Figure FDA0003562032340000022
the radial length of each subarea from the excircle to the inner circle of the grinding sheet is respectively as follows: mm;
Figure FDA0003562032340000023
the ratio values of the radial lengths of all the subareas from the outer circle to the inner circle of the grinding sheet are respectively an integer, and the value range is 3-6;
s13 preliminary calculation of the radial length of each subarea of the grinding sheet specifically includes:
Figure FDA0003562032340000024
in the formula (I), the compound is shown in the specification,
Figure FDA0003562032340000025
taking integers, unit: mm, DnDiameter of inner circle of grinding piece, unit: mm;
s14 verifies the rationality of the radial length of each section of the grinding sheet, and specifically comprises the following steps:
Figure FDA0003562032340000026
in the formula, gamma is the radial level difference of the grinding disc subareas, and if gamma is more than or equal to 0, the radial length of each subarea of the grinding disc is reasonably distributed; if gamma is less than 0, the radial length of each subarea of the grinding plate is unreasonably distributed, and the steps S12-S14 are repeated to determine the radial length of each subarea again;
s15, determining the final radial length value of each section of the grinding sheet, specifically:
Figure FDA0003562032340000027
in the formula, LfziThe radial length final value of the ith subarea of the grinding sheet is represented by the following unit: mm.
3. A method according to claim 2, wherein S21 is used for determining the initial calculation number of the theoretical optimal value of the fiber length of each section of the grinding plate, specifically:
Figure FDA0003562032340000028
in the formula, QxwciCalculating the quantity, Q, of theoretical optimal values of the fiber lengths of the ith subarea of the abrasive discxwciRounding off is an integer, unit: when Q is greater thanxwci>At 5, get Qxwci＝5。
4. A method according to claim 3, wherein S22 is used to determine the radial displacement of each initial value of the theoretical optimal value of the fiber length in each section of the refiner plate, specifically:
Figure FDA0003562032340000031
in the formula, LmplijTaking an integer and a unit for the theoretical optimal value initial value radial displacement of the jth fiber length of the ith subarea of the grinding sheet: mm, i ═ 1, 2, · Qf，j＝1、2、...、QxwciAnd let Lfz0＝0；ηiIs a constant integer, ηi＝5～10。
5. A method for designing a refiner plate according to claim 4, wherein S23 is used to calculate the theoretical optimal fiber length for each section of the plate, specifically:
Figure FDA0003562032340000032
in the formula IxwLijFor each section of the grinding disc with a radial displacement of LmplijThe theoretical optimal value of the fiber length is as follows, unit: mm; l isYCIs the average value of the maximum linear dimension of the wood raw material, and the unit is as follows: mm, LhgIn order to meet the qualified fiber length of the fiber board product performance requirement, the unit is as follows: mm; sigmalThe grinding strength of the grinding plate is obtained.
6. A method according to claim 5, wherein S24 is used to calculate the theoretical optimal value of the fiber length of each section of the refiner plate, specifically:
Figure FDA0003562032340000033
in the formula (I), the compound is shown in the specification,
Figure FDA0003562032340000034
the theoretical optimal value of the fiber length of the ith subarea of the grinding sheet is as follows: mm.
7. A method according to claim 6, wherein S31 is used for determining the gap of each section of the grinding plate, specifically:
τi(i+1)＝δf(i+1) (i＝1、2、...、Qf-1)
in the formula, τi(i+1)Is the gap between the ith and (i + 1) th sub-zones of the grinding sheeti(i+1)Is located in the ith section of the grinding sheet when taui(i+1)When t is more than or equal to 5, taking taui(i+1)5, unit: mm.
8. A method according to claim 7, wherein S32 is used to determine the tooth width of each section of the refiner plate, specifically:
Figure FDA0003562032340000035
in the formula, BckiFor the grinding tooth width of the ith subarea of the grinding plate, rounding off is carried out to obtain an integer, and the unit is as follows: mm; mu is a tooth width coefficient, and mu is 0.4-0.9.
9. A method according to claim 8, wherein S33 is used for determining the number of teeth of each section of the grinding plate, specifically:
Figure FDA0003562032340000041
in the formula, niNumber of grinding teeth for i-th section of grinding disc, niRounding to the nearest integer divisible by 6, unit: a plurality of; lambda [ alpha ]iIs a regional coefficient when i is 1, 2fAt-1, λiWhen i is equal to QfWhen is lambdai＝2。
10. A method according to claim 9, wherein S34 is a method for designing a refiner plate based on a theoretical optimum fiber length, wherein the step of determining the step pitch angle of each segment of the plate is as follows:
Figure FDA0003562032340000042
in the formula, alphaiFor the grinding tooth inclination angle of the ith subarea of the grinding sheet, rounding off the inclination angle to obtain an integer with the unit: degree; zeta is the correction coefficient of the inclination angle of the grinding teeth, and zeta is-6 degrees to +6 degrees;
s35 determining the width of each section tooth groove of the grinding sheet, which specifically comprises the following steps:
Figure FDA0003562032340000043
s36, determining the grinding tooth height of the grinding plate, specifically:
Figure FDA0003562032340000044
in the formula, HmcTaking an integer and a unit: mm;
Figure FDA0003562032340000045
for the tooth-height correction factor,
Figure FDA0003562032340000046
unit: mm;
s37 determining the tooth width of the grinding disc circumferential teeth, specifically:
Bzcki＝Bcki (i＝1、2、...、Qf)；
s38 determining the tooth height of the grinding disc in the circumferential direction, specifically:
Figure FDA0003562032340000051
in the formula, HzmciAnd (3) the circumferential tooth height of the ith subarea of the grinding sheet is rounded and reserved with one decimal, unit: mm.
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