CN100402740C - Method for feed preparation of grass pulping raw material by using rigid hammer crusher - Google Patents
Method for feed preparation of grass pulping raw material by using rigid hammer crusher Download PDFInfo
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- CN100402740C CN100402740C CNB2007101462972A CN200710146297A CN100402740C CN 100402740 C CN100402740 C CN 100402740C CN B2007101462972 A CNB2007101462972 A CN B2007101462972A CN 200710146297 A CN200710146297 A CN 200710146297A CN 100402740 C CN100402740 C CN 100402740C
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Abstract
The invention relates to a method for making up grass type pulp-making materials by a hammer crusher, which comprises crushing, dust removing and sieving. The crushing uses a hammer crusher. The raw materials passes a thrusting section, a cutting and rubbing section and an outputting & separating section in the hammer crusher. As the cutting and rubbing section in the invention can make the raw materials be additionally hammered, rubbed and cut, and as the raw materials are pushed forward gradually in the process and will not be discharged, the raw materials are guaranteed to be treated thoroughly, and turned up continuously during the pushing, this further guarantees the thorough hammering, rubbing and cutting of the raw materials, so that the straws are rubbed apart and the foreign matters in the straws are removed. In addition, the invention is applicable for the making up of a plurality of grass type pulp-making materials.
Description
Technical field
The present invention relates to a kind of method of getting the raw materials ready of pulping raw material, specifically, the present invention relates to a kind of method of utilizing hammer mill that the making grass pulp raw material is got the raw materials ready.
Background technology
In the pulping and paper-making industry, utilizing the grass raw material to carry out slurrying is comparatively common a kind of pulping process in China, generally all can be in its pulping process to the raw material processing of getting the raw materials ready, and main purpose is to remove some bigger impurity and with forage chopping, dedusting.The grass kind plant pulping raw material mainly comprises straw, wheat straw, bagasse, Chinese alpine rush, reed, bamboo, straw, cotton stalk, sorghum stalk etc. (" non-wood-fiber soda pulping process application manual commonly used ", 38～40 pages, alkaline straw-pulp Professional Committee of China Paper Industry Technical Association " non-wood-fiber soda pulping process application manual commonly used " writes group), mainly utilize the more bar portion of cellulose, other is as leaf, joint, contain the thin-walled heteroproteose cell that in a large number pulping and paper-making is not had what use value in fringe and the sheath, it is high to cause chemicals to consume in the slurrying production process, and the refuse amount is big, the slurry washing difficulty, the problem of the low and easy brightness reversion of degree of bleaching.In addition, impurity such as the silt that is mingled with in the dogstail raw material, dust also can cause difficulty and paper quality is brought many bad influences to pulping and paper-making.Therefore, the link of getting the raw materials ready in the grass kind plant slurrying is most important.
The method of getting the raw materials ready of grass raw material can be divided into dry method, wet method, synthesis etc.Dry raw material preparation is meant that raw material (promptly storing moisture) under certain moisture carries out various necessary processing, to satisfy the requirement of pulping and paper-making production process and product quality.This method extensively adopts at home because flow process is simple, equipment is few, and is easy to operate, and energy consumption is low, and technology maturation.With getting the raw materials ready of straw is example, and common technological process is (" pulping process and equipment ", Kuang Shoumin etc., in October, 2000, a 85-93 page or leaf): (1) is delivered to the rice wheat straw raw material and carries out chaffcutter in the chaffcutter; (2) the blade wind that cuts is sent or conveyer belt is delivered to the screening cleaner, remove heavy seeds such as heavier sandstone and grain; (3) be delivered to and carry out boiling in the boiling vessel.And for the getting the raw materials ready of raw materials such as reed, awns bar, then following steps that adopt more, (1) is delivered to raw materials such as reed, awns bar to cut through conveyer belt and is cut off in the reed machine; (2) raw material that cuts is delivered to carried out dedusting in the cyclone dust removal machine; (3) raw material that will separate from cyclone separator is sent into screening machine and is screened; (4) raw material that has screened is delivered to and carries out boiling in the boiling vessel.
This dry-like method existing problem of getting the raw materials ready is: the technology of getting the raw materials ready is all used chaffcutter, what mainly realize is the blade that forage is cut into certain-length (15-30mm), but because can not be with forage especially its shaft-like partially opening, thereby cooking liquor is difficult to infiltrate into the inside of dogstail raw material when causing boiling, causes the inhomogeneous of boiling.
Hammer mill is known as hammer-mill again, is the high speed impact effect that utilizes tup, the crushing mechanism of broken and operation in small, broken bits during material is carried out.Tup is articulated on the high speed rotor rotated, and underpart is provided with grid section with the control marker size.The material of sending into disintegrating machine at first is subjected to the impact of tup of high-speed motion and primary crushing, and obtains kinetic energy simultaneously, flies to the crushing shell on the casing inner wall at a high speed and is subjected to fragmentation once more.Material less than the grid section slit is discharged from outside the machine, is subjected to the impact and the grinding of tup once more greater than the material piece in grid section slit on grid section, is discharged from after less than the grid section slit.This disintegrating machine is commonly used to hard following brittle material in crushed stone lime stone, shale, coal, gypsum, the chalk etc., also can be used for broken wood fragments, bark etc.
CN87211194U discloses a kind of bamboo shredder, belongs to the improvement of hammer mill, is used to tear up bamboo, makes the paper mill slurrying usefulness of getting the raw materials ready.Mainly by rotor portion, tear screen sections, rack section is formed, from the charging aperture direction, tup and tear up staircase rectilinear clearance is arranged between tooth bar is the groundwork part of bamboo shredder.This tears up function bamboo is torn into filament, thereby makes digestion time obtain shortening.But, this shredder mainly is applicable to the bamboo raw material, and because raw material is through the zone that enters grating after tearing up gap between tooth bar and the tup immediately and sifted out after entering shredder, therefore part material can occur and not reach as yet and tear up effect preferably and just be discharged from, influence the quality of tearing up.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of method of utilizing hammer mill that the making grass pulp raw material is got the raw materials ready, this method can be beaten, crumple and cut off raw material more completely, and is widely used in getting the raw materials ready of all kinds of grass pulping raw materials.
In order to realize purpose of the present invention, a kind of method of utilizing hammer mill that the making grass pulp raw material is got the raw materials ready is provided, comprise and cut off rubbing, dedusting and screening, hammer mill is adopted in described cut-out rubbing, it is characterized in that described raw material passes through following process successively in this hammer mill:
A. raw material enters one and advances section, and the axis direction along this crusher rotor under the propelling hammer effect with inclined plane of this disintegrating machine is pushed into;
B. raw material enters one and cuts off the rubbing section, is beaten under the acting in conjunction of frictional force, grinding pressure and the impulsive force of the quartering hammer with inclined plane of this hammer mill, rubbing and cutting off;
C. raw material enters a discharging segregation section, is discharged under the discharging hammer effect of this hammer mill.
Grass raw material through after this process processing not only can reach the effect that raw material is cut off, more can be by hammering, rubbing, make the stalk of raw material be opened by stranding, the inner impurity of stalk obtains discharging, and cooking liquor permeates easily when being convenient to follow-up boiling, the better effects if of boiling.
After the present invention preferably adopts this cut-out rubbing section of raw material process, be the sheet or the strip of cracking.The raw material that is the sheet of cracking or strip more helps the infiltration of cooking liquor, further improves the effect of boiling.
The length of preferred feedstock of the present invention to this feed of crusher the time is 300-800mm, is being 20-80mm through the length during discharging after the break process.Charging length is oversize can to influence treatment effect, too short charging preceding processing time and the cost of then can increasing.Through overtesting, handling back length is that 20-80mm helps boiling afterwards and other operations.What deserves to be mentioned is that general gets the raw materials ready, especially straw and wheat straw etc. gets the raw materials ready, be with raw material handle to length be 20-50mm, and this method is because the stalk of raw material is opened by stranding, and raw material is the sheet or the strip of cracking, even the therefore cooking effect that also still can obtain greater than 50mm of length.
The time of staying of preferred feedstock of the present invention in cutting off reduction stage is 10-60 second.Because this section can be processed into raw material the sheet or the strip of cracking for being the critical section of handling raw material, therefore need to guarantee certain processing time, according to the difference of raw material, be preferably 10-60 second.The time of staying can be controlled by the angle of the relative axis in quartering hammer inclined plane and the length of this section.
The preferred described cut-out rubbing segment length of the present invention is 400-800mm, and its ratio with this discharging segregation section length is 1.5-3: 1, and its ratio with this propelling segment length is 1.5-2: 1.The length of cutting off the rubbing section is bigger, mainly is the requirement of thoroughly cutting off rubbing in order to satisfy.Because discharging section may have raw material and still promptly be discharged from without overcharging divisional processing, especially many kinds of raw materials in the grass such as straw, wheat straw, cotton stalk, reed etc. are comparatively tiny, hardness is lower, if cut off the not enough of rubbing section processing, then can cause raw material not occur stalk as yet and rub with the hands and to hold and be the sheet of cracking or the effect of strip just is discharged from, have a strong impact on the effect of cutting off rubbing.
The rotating speed of the rotor of the preferred described hammer mill of the present invention when work is 500-720rpm.Rotating speed greatly then cuts off the rubbing great efforts, but the loss to machine is also big simultaneously.Through overtesting, the rotating speed of 500-720rpm is relatively to be fit to for the grass raw material.
The angle of the inclined plane of the preferred described propelling hammer of the present invention and the axis of this crusher rotor is the 50-70 degree; The angle of the inclined plane of described quartering hammer and the axis of this crusher rotor is the 30-50 degree.Such propelling hammer angle of inclination helps raw material arranges by mixing mussily to become relatively regularly, and in this process gradually with the axis almost parallel of rotor so that ensuing break process.Such quartering hammer angle of inclination is guaranteeing to have satisfied broken needs under certain progradation to raw material.
The preferred described propelling hammer of the present invention, quartering hammer and discharging hammer all are articulated in the hammer dish, and wherein advancing the full swing angle of hammer is the 100-120 degree, and the full swing angle of quartering hammer is the 2-6 degree, and the full swing angle of discharging hammer is the 150-180 degree.What the pendulum angle of propelling hammer helped more greatly advancing carries out smoothly, and the pendulum angle of quartering hammer then must be less, and to satisfy broken requirement, greatly then crushing effect is poor as if pendulum angle.Discharging hammer then with prior art in the hammer of disintegrating machine similar, its pendulum angle is not limited.
The preferred described hammer mill of the present invention is distributed with projection at the inner surface of this propelling section at least, also can be distributed with projection in cut-out rubbing section and discharging section, the shape of projection can be triangle, rectangle, square, trapezoidal etc., and purpose is an effect of cutting off rubbing in order to increase.
The top of preferred described propelling hammer of the present invention or discharging hammer is 4-8mm to the distance of this projection.Distance on the top that does not have the preferred described hammer that advances section under the situation of projection, cuts off rubbing section or discharging hammer to the inner surface of respective handling section is 4-8mm.Too small then the resulting in blockage easily of this distance and machine is stopped, the excessive effect that then can't guarantee to cut off rubbing.
The also preferred described propelling hammer of the present invention is total to the 3-5 group for 2-6 one group, and every group is hinged on the same hammer dish; Preferred quartering hammer is 2-6 one a group 3-11 group altogether, and every group is hinged on the same hammer dish; Preferred discharging hammer is 3-6 one group totally 3 groups, and every group is hinged on the same hammer dish.Promptly the quantity that preferably advances hammer, quartering hammer and discharging to hammer into shape is respectively 6-30,6-66 is individual and 6-18 is individual.These are hammered every group into shape and are evenly distributed on the hammer dish, can be evenly distributed with 2-6 hammer on each hammer dish.For the grass raw material, many hammers dish, many tups more help improving the effect of cutting off rubbing.
The raw material that the present invention handles is preferably a kind of in straw, wheat straw, cotton stalk, the reed.
The used beater grinder of the present invention is transformed on the basis of existing beater grinder and is obtained, and mainly is the change of charging aperture and discharging opening position, rotor length and hammer shape.
Beneficial effect of the present invention is: advance section because the present invention crosses Cheng Qian adding one in the cut-out rubbing section of prior art, make raw material can obtain extra hammering, rubbing and cut-out, and because raw material is pushed ahead gradually in this process, and can not be discharged from, both can guarantee to handle comparatively completely, can in the process that advances, raw material constantly be dug again, further guaranteed thorough hammering to raw material, rubbing and cut-out, make the stalk of raw material be opened by stranding, the inner impurity of stalk obtains discharging, raw material presents the sheet or the strip of cracking simultaneously, cooking liquor permeates easily when being convenient to follow-up boiling, even the better effects if of boiling is the cooking effect that length also still can obtain greater than the raw material of 50mm.In addition, the speed that raw material is pushed into just raw material cut off the rubbing section and advance time of staying of section can be easily the angle of inclination on inclined plane by hammer control, and method of the present invention goes for getting the raw materials ready of multiple making grass pulp raw material.
Description of drawings
Fig. 1 is the hammer mill structural representation of the embodiment of the invention 1.
Fig. 2 is the schematic cross-section of Fig. 1.
Fig. 3 is that schematic diagram is compared in the longitudinal cross-section of three kinds of hammers of the present invention.
The specific embodiment
As shown in Figure 1, hammer mill comprises charging aperture 1, and housing 10 and rotor 6 are fixed with hammer dish 3 on the rotor, is hinged with the plural number hammer on the hammer dish 3.The charging aperture of traditional hammer mill below faces discharging opening, and present embodiment changes it into as figure form, and the hammer with inclined plane is set advances and broken raw material, raw material is discharged from discharging opening again.
At first, be that the wheat straw of 300mm is sent into hammer mill as shown in Figure 1 with length.Raw material promptly enters propelling section 2 after charging aperture 1 enters in this disintegrating machine, be provided with 3 identical hammer dishes 3 on the inherent rotor 6 of this section altogether, and hinged 2 of even compartment of terrain advances hammer 4 on each hammer dish 3, totally 6 propelling hammers 4.This propelling hammer 4 has an inclined plane, and the angle 5 of the axis direction of this inclined plane and rotor 6 is 50 degree.Evenly be provided with projection 11 on the inner surface of propelling section 2, it is shaped as rectangle, and the top of projection 11 is 4mm to the distance that advances hammer 4 tops.Raw material is subjected to having propelling hammer 4 effects on inclined plane in advancing section 2, axis direction along rotor 6 is pushed into, and in this process, arrange by mixing mussily to become relatively regularly, the length direction of raw material is roughly consistent with the axis direction of rotor gradually, so that ensuing break process.
Raw material enters and cuts off rubbing section 7 subsequently, is provided with 3 identical hammer dishes 3 on the inherent rotor 6 of this section altogether, hinged 2 quartering hammers 8 in even compartment of terrain, totally 6 quartering hammers on each hammer dish 3.This quartering hammer 8 has an inclined plane, and the angle 9 of the axis direction of this inclined plane and rotor 6 is 50 degree.Cut off on the inner surface of crumpling section 7 and evenly be provided with projection 11, it is shaped as rectangle, and the top of projection 11 is 4mm to the distance on quartering hammer 8 tops.The time of staying of raw material in this section is 10 seconds, under the acting in conjunction of frictional force, grinding pressure and the impulsive force of the quartering hammer with inclined plane 8 of this hammer mill, beaten, rubbing and cutting off, raw material becomes sheet or strip, and raw material is the cracking shape owing to beating, crumpling.Because quartering hammer 8 has the inclined plane equally, so raw material is advanced discharging segregation section 12 equally.
At discharging segregation section 12, be provided with 3 identical hammer dishes 3 on the rotor 6 altogether, hinged 2 dischargings hammer 13 in even compartment of terrain, totally 6 dischargings hammers on each hammer dish 3.This discharging hammer 13 does not have the inclined plane.Projection is not set on the inner surface of discharging segregation section 12, and it is 4mm to the distance of housing 10 inner surfaces that 13 tops are hammered in discharging into shape.Broken up, disperse and be discharged from this section raw material, control the size of discharging by the sieve (not shown) at discharging opening place, the discharging size of present embodiment is 80mm.
In above processing procedure, cutting off rubbing section 7 length is 400mm, and its ratio with discharging segregation section 12 length is 2: 1, and it is 1.5: 1 with the ratio that advances section 2 length.In addition, the rotating speed of present embodiment rotor 6 is 720rpm.
Figure 2 shows that the schematic cross-section of present embodiment, on hammer dish 3, by a short support bar 14 and draw money on credit stay 15 limit hammer can movable maximum angle on hammer dish 3.In addition, see also Fig. 3, be the comparison schematic diagram of three kinds of hammers of present embodiment.Above for advancing the profile of hammer 4, utilize structural adjustment support bar 15 as shown in Figure 2 to make it that scopes of activities of 120 degree can be arranged, this group hammer is equivalent to spiral and raw material is transported to cuts off rubbing section 7 under rotation at a high speed.Middle is the profile of quartering hammer 8, utilizes structural adjustment support bar 15 as shown in Figure 2 to make that the full swing angle of quartering hammer 8 is 2 degree, guarantees that the 11 pairs of raw materials of projection on quartering hammer 8 and the housing 10 cut off the effect of rubbing.Be the profile of discharging hammer 13 below, utilize structural adjustment support bar 15 as shown in Figure 2 to make that the full swing angle of discharging hammer 13 is 180 degree, it mainly acts on is that the raw material after the cut-out rubbing is disperseed to stitch by sieve.In addition, in conjunction with Fig. 1 as can be seen, quartering hammer 8 is the wideest in three kinds of hammers, and the tup part is bigger, can obtain better crushing effect.
On the basis of embodiment 1, the difference of present embodiment is:
Present embodiment is that the straw of 500mm is sent into hammer mill with length.Advance on the section 2 inherent rotors and be provided with 5 identical hammer dishes 3 altogether, hinged 6 of even compartment of terrain advances hammer 4 on each hammer dish 3, and totally 30 advance hammer 4.This propelling hammer 4 has an inclined plane, and the angle 5 of the axis direction of this inclined plane and rotor 6 is 70 degree.Advance section 2 that projection is not set, advancing hammer 4 tops is 8mm to the distance of housing 10 inwalls.
Cut off on the rubbing section 7 inherent rotors 6 and be provided with 11 identical hammer dishes 3 altogether, hinged 6 quartering hammers 8 in even compartment of terrain, totally 66 quartering hammers on each hammer dish 3.This quartering hammer 8 has an inclined plane, and the angle 9 of the axis direction of this inclined plane and rotor 6 is 30 degree.Shape for lugs is a square, and the top of projection is 8mm to the distance on quartering hammer 8 tops.The time of staying of raw material in this section is 60 seconds.
Be provided with 3 identical hammer dishes 3 altogether at discharging segregation section 12, even hinged 6 dischargings hammer 13 in compartment of terrain on each hammer dish 3, totally 18 dischargings hammers, it is 8mm to the distance of housing 10 inner surfaces that 13 tops are hammered in discharging into shape, the discharging size of present embodiment is 20mm.
In above processing procedure, cutting off rubbing section 7 length is 800mm, and its ratio with discharging segregation section 12 length is 3: 1, and it is 2: 1 with the ratio that advances section 2 length.In addition, the rotating speed of present embodiment rotor 6 is 500rpm.
The full swing angle that advances hammer 4 is 100 degree; The full swing angle of quartering hammer 8 is 6 degree; The full swing angle of discharging hammer 13 is 150 degree.
On the basis of embodiment 1, the difference of present embodiment is:
Present embodiment is that the reed of 800mm is sent into hammer mill with length.Advance on the section 2 inherent rotors and be provided with 4 identical hammer dishes 3 altogether, hinged 4 of even compartment of terrain advances hammer 4 on each hammer dish 3, and totally 16 advance hammer 4.This propelling hammer 4 has an inclined plane, and the angle 5 of the axis direction of this inclined plane and rotor 6 is 60 degree.The top of projection 11 is 5mm to the distance that advances hammer 4 tops, and being shaped as of projection is trapezoidal.
Cut off on the rubbing section 7 inherent rotors 6 and be provided with 6 identical hammer dishes 3 altogether, hinged 4 quartering hammers 8 in even compartment of terrain, totally 24 quartering hammers on each hammer dish 3.This quartering hammer 8 has an inclined plane, and the angle 9 of the axis direction of this inclined plane and rotor 6 is 40 degree.Shape for lugs is trapezoidal, and the top of projection is 5mm to the distance on quartering hammer 8 tops.The time of staying of raw material in this section is 20 seconds.
Be provided with 3 identical hammer dishes 3 altogether at discharging segregation section 12, even hinged 4 dischargings hammer 13 in compartment of terrain on each hammer dish 3, totally 12 dischargings hammers, it is 5mm to the distance of housing 10 inner surfaces that 13 tops are hammered in discharging into shape, the discharging size of present embodiment is 50mm.
In above processing procedure, cutting off rubbing section 7 length is 600mm, and its ratio with discharging segregation section 12 length is 1.5: 1, and it is 1.8: 1 with the ratio that advances section 2 length.In addition, the rotating speed of present embodiment rotor 6 is 600rpm.
The full swing angle that advances hammer 4 is 110 degree; The full swing angle of quartering hammer 8 is 4 degree; The full swing angle of discharging hammer 13 is 160 degree.
On the basis of embodiment 1, the difference of present embodiment is:
The raw material of present embodiment is a cotton stalk, is equipped with projection cutting off rubbing section 7 and discharging segregation section 12, projection be shaped as equilateral triangle.
On the basis of embodiment 2, the difference of present embodiment is: the raw material of present embodiment is a giantreed.
Above embodiment is used to explain the present invention, and unrestricted the present invention.As multiple grass being mixed simple change as raw material, charging size; the simple change of the size of device therefor; the simple change of the weight of hammer, quantity, rotor speed etc., what the those skilled in the art such as simple change at the angle of inclination, inclined plane of hammer expected on the basis of disclosed content easily all should belong within protection scope of the present invention.
Claims (10)
1. method of utilizing hammer mill that the making grass pulp raw material is got the raw materials ready, comprise and cut off rubbing, dedusting and screening, hammer mill is adopted in described cut-out rubbing, it is characterized in that described raw material passes through following process successively in this hammer mill:
A. raw material enters one and advances section, and the axis direction along this crusher rotor under the propelling hammer effect with inclined plane of this disintegrating machine is pushed into;
B. raw material enters one and cuts off the rubbing section, is beaten under the acting in conjunction of frictional force, grinding pressure and the impulsive force of the quartering hammer with inclined plane of this hammer mill, rubbing and cutting off;
C. raw material enters a discharging segregation section, is discharged under the discharging hammer effect of this hammer mill.
2. the method for claim 1 is characterized in that, after described raw material cuts off the rubbing section through this, is the sheet or the strip of cracking.
3. method as claimed in claim 1 or 2 is characterized in that, the length of described raw material to this feed of crusher the time is 300-800mm, is being 20-80mm through the length during discharging after the break process.
4. the method for claim 1 is characterized in that, the time of staying of described raw material in this cut-out rubbing section is 10-60 second.
5. the method for claim 1 is characterized in that, described cut-out rubbing segment length is 400-800mm, and its ratio with this discharging segregation section length is 1.5-3: 1, and its ratio with this propelling segment length is 1.5-2: 1.
6. the method for claim 1 is characterized in that, the rotating speed of described hammer mill its rotor when work is 500-720rpm.
7. the method for claim 1 is characterized in that, the angle of the inclined plane of described propelling hammer and the axis of this crusher rotor is the 50-70 degree; The angle of the inclined plane of described quartering hammer and the axis of this crusher rotor is the 30-50 degree.
8. as claim 1 or 7 described methods, it is characterized in that described propelling hammer, quartering hammer and discharging hammer all are articulated in the hammer dish, wherein advancing the full swing angle of hammer is the 100-120 degree, the full swing angle of quartering hammer is the 2-6 degree, and the full swing angle of discharging hammer is the 150-180 degree.
9. the method for claim 1 is characterized in that, described hammer mill is distributed with projection at the inner surface of this cut-out rubbing section at least.
10. the method for claim 1 is characterized in that, described raw material is a kind of in straw, wheat straw, cotton stalk, the reed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101462972A CN100402740C (en) | 2007-09-03 | 2007-09-03 | Method for feed preparation of grass pulping raw material by using rigid hammer crusher |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007101462972A CN100402740C (en) | 2007-09-03 | 2007-09-03 | Method for feed preparation of grass pulping raw material by using rigid hammer crusher |
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| CN100402740C true CN100402740C (en) | 2008-07-16 |
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|---|---|---|---|---|
| CN106031897B (en) * | 2015-03-20 | 2021-02-09 | 山东泉林纸业有限责任公司 | Material preparation system and method for continuous cooking |
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| CN87211194U (en) * | 1987-07-30 | 1988-05-11 | 赣南有色矿山机械厂 | Bamboo crusher |
| CN2034870U (en) * | 1988-05-17 | 1989-03-29 | 吉林省梨树县曙光造纸厂 | Straw skin and pith separator |
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| CN101109156A (en) | 2008-01-23 |
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