CN102666978B - Unit, structures and methods for screen fibre element paper pulp - Google Patents
Unit, structures and methods for screen fibre element paper pulp Download PDFInfo
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- CN102666978B CN102666978B CN201080058093.3A CN201080058093A CN102666978B CN 102666978 B CN102666978 B CN 102666978B CN 201080058093 A CN201080058093 A CN 201080058093A CN 102666978 B CN102666978 B CN 102666978B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 title claims description 21
- 229920001131 Pulp (paper) Polymers 0.000 title claims description 19
- 238000012216 screening Methods 0.000 claims abstract description 254
- 239000000725 suspension Substances 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 description 10
- 230000004888 barrier function Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 235000013312 flour Nutrition 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 241000244155 Taenia Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/06—Rotary screen-drums
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
nullThe present invention relates to a kind of screening unit (100)、Screening structure (200) and the method for the groove for checking and/or in regulation screening structure，Wherein，Screening unit 100 includes excircle axial groove (122)，This excircle axial groove is formed in screening unit (100) outer perimeter and between first opposing outer face (123) and second opposing outer face (133) of stationary parts (134) of rotatable parts (124)，The first opposing outer face (123) and the second opposing outer face (133) that form outer axial groove (122) are all located at the circumference in screening unit (100)，Thus，Before screening unit (100) inserts screening structure (200) and/or when screening structure (200) removes screening unit (100)，Outer axial groove (122) is can be close to adjustable.
Description
Technical field
The present invention relates to the process of cellulose pulp, and particularly relate to the screening unit of a kind of screening structure for cellulose pulp, screening structure and the method relevant with screen fibre element paper pulp.
Background technology
When preparation will be used for the cellulose pulp processing (such as papermaking or the like) further, it is frequently performed multiple " standard " operation.For chemical pulp, the lignin dissolution of wood flour is in digester(-tor), so that the fiber in wood flour is separated from one another.Then, well-done paper pulp is sent to washing and screening structure.During boiling, and not all wood flour is goodly by digestion, and therefore, gained paper pulp not only comprises the fiber being separately separated, and also includes the wood flour not boiled, knaur and is known as the fibre bundle of fragment.Also stay the fragment in paper pulp, knaur and other impurity (such as, sand, bark) and problem can be caused in the later stage of pulp processing, it is therefore desirable to get rid of.Have known to many, make from paper pulp, separate the operation of impurity alone or in combination, including precipitation, screening and eddy current cleaning.
Screening typically refers to the fiber of pulp suspension through having hole or a perforated plate of groove and the retained operation of impurity.Screening the restricted area also by some other kinds to complete, the sieve basket being such as made up of taeniae, these taeniaes have the groove for making the definite part of pulp suspension pass between taeniae.In pulp mill, often the diverse location in whole processing procedure has some screening operations.
There is several different types of screening installation.A kind of conventional screening installation is so-called combination sieve, it means that two or more screening stages combine in same sieve shell.Disclosing the example of this equipment in EP1165882, wherein, the first Circular-cylinder sieve screening device is at least partially situated in the second Circular-cylinder sieve screening device.In order to make processing procedure more cheap, having been developed for such combined sorting equipment, wherein, two different screening installations are combined into an equipment, thus eliminate such as individually except the demand of joint device.
In order to make the screening installation with Circular-cylinder sieve option type be properly acted upon, it is necessary to have at least one to produce the rotatable parts of pressure pulse, thus prevent pulp suspension only covering sieve favored area and be not passed through this screening areas.In certain embodiments, screening member itself rotates and cooperates with stator, it is also possible to use static screening member and single rotor on the contrary.Rotor or stator are typically provided with the pulser producing pressure pulse, thus clean the screening opening of fibrous suspension.For the screening structure of combination, in screening member is rotatable, and another is static.Also having two screening members is all that rotating combination type screens structure.Having one or several rotatable parts and produce several challenges, one of them challenge is how to solve the various flows problem simultaneously remaining to rotate separated from one another in holding means.In the screening structure of combination, need at least one this separation barrier, and usual each screening stage has a separation barrier to be included in combinative structure.Such as separate barrier and may also be arranged to make the stream of the receiving portion from a stage and the flow separation of the injection part to same stage.Barrier may also be arranged to injection stream and the injection flow separation to another stage made to a stage.Substantially, rotate and stationary parts is arranged to sealed against one another, to guarantee that pulp suspension will flow through screen cylinder and not flowing between static and rotatable parts.
In order to be able to rotate, form circumferential slot between stationary parts rotating.The flow being dimensioned to operationally flow through the pulp suspension of groove of groove minimizes, so that it is guaranteed that be not in contact with between rotating surface and static surface when rotating surface rotates.In some screening structures, groove is that radially this means that the width of this groove radially extends.The size of this radial slot is uncontrollable, this is because determine that the diameter of the corresponding rotation of groove size and stationary cylinder shape parts is variant.The another kind of method of design groove is by forming axial groove, it means that the width of groove axially extends.The size of axial groove can be regulated by the apparent surface of regulation formation groove.In the case, word slot width and groove size are used interchangeably, and refer to radially extend when groove is radial direction, and refer to axially extending when groove is axial.The groove size of axial groove is also referred to as groove height.
In the running of screening structure, the surface forming groove can be through frayed, and the size of this hint circumferential slot can grind off along with surface and change.Variations in temperature in operating process also can affect the size of groove.If groove becomes too big, the function separating various flows in screening structure can be deteriorated, this is because passage allows the separated volume of pulp suspension, the most different receiving portions and injection part to mix by being large enough to.Fiber entrance groove the risk blocked also will increase, thus increase the abrasion on the surface forming groove further and significantly more, this is because the fiber blocked will cause wear extent to increase.
In the screening structure of prior art, particularly when including more than one screening stage, the inspection of axial groove size with regulation be considerably complicated operation, this is because in order to check and for subsequent adjustment close to be included in screening shell in groove (if this is considered as if necessary) be complicated.
In combining two different screening stages and having and in some screening structures of outer screening member, have been provided with comprising the removable screening unit of interior screening member and rotor.This removable screening unit makes it possible to have easy access to interior screening member.In an in itself previously known structure, by first remove cover screening shell top cover, lift removable screening unit then up and remove screening unit.Previously in known screening structure, multiple demounting procedure can be needed before being removed in screening unit.
Summary of the invention
One general purpose of the present invention is to provide the screening unit for screen fibre element paper pulp and the structure of a kind of improvement.Another object is to provide a kind of screening unit, screens structure and for the method improving the performance of the screening structure comprising screening unit.Specific purposes be realize checking and/or in regulation screening structure, groove between rotatable parts and stationary parts simpler, more effectively and more reliable approach and the screening unit set for this purpose, this screening structure includes more than one screening stage.Another object is to provide the screening unit making the demand regulating this groove due to abrasion minimize and screening structure.
According to claims, have been achieved with these purposes.
In brief, the present invention proposes a kind of screening unit, screens structure and the method for the groove for checking and/or in regulation screening structure, and wherein, excircle axial groove can close and regulation outside screening structure.It is positioned at two surfaces in removable screening unit, that form axial groove by having, is easily accessible to, checks and regulating tank.Additionally, not the changing when being set in insertion screening structure of groove, and groove size is to comprising screening unit, to screen the change of temperature and/or the pressure caused in the running of structure less sensitive.In the surface forming outer axial groove one is included in the previous designs in screening shell, and the change of pressure and temperature differently impact can screen shell and screening unit, thus causes the diversity of such as thermal expansion.
More specifically, it is provided with screening unit according to the present invention, screen structure and for checking and/or the method for regulating tank, wherein, screening unit includes being formed in the outer perimeter of screening unit, excircle axial groove between first opposing outer face and the second opposing outer face of stationary parts of rotatable parts, the first opposing outer face forming outer axial groove is positioned at screening unit upper periphery with the second opposing outer face, thus, before removable screening unit inserts screening structure and/or when screening structure removes removable screening unit, outer axial groove is can be close to adjustable.
According to an embodiment, before inserting screening structure and when removing from screening structure, the inner periphery axial groove between the first opposite inner face and second opposite inner face of interior stationary parts of inner rotatable part is also can be close and adjustable.Therefore, it can simple mode close to and regulating circumferential axial groove, and guarantee that groove keeps their setting when inserting screening structure.Another advantage be the whole periphery of outer axial groove be to check with come-at-able, this make if necessary can only specific site make change/regulate.The most also can easily check groove, and groove will not change due to the pressure, temperature variation when making screening structure run.Having more than two screening stage and therefore in embodiment possibly more than two circumference axial grooves, all grooves form surface and may be provided in removable screening unit.Even if in the structure only with two screening stages, may have more than two circumference axial grooves and all of groove forms surface and is advantageously arranged in removable screening unit.
Inner rotatable part can be the first screening plant, and interior stationary parts can be the parts being directly or indirectly connected to bearing unit.But, other parts also may make up the static and rotatable parts of correspondence.Such as, the first screening plant may be constructed interior stationary parts.
In one embodiment, form the corresponding apparent surface of circumference axial groove and there is radially the extension of (R) and (A) vertically, and the groove that the corresponding apparent surface forming groove is arranged in terms of central axis C about correspondence is directed on substantially the same radial distance in couples.At least one in corresponding apparent surface can include circumferentially disposed replaceable wear ring, and these rings advantageously can be made up of the most separable part of at least two, thus easily removes wear ring when changing.In one embodiment, wear ring is made up of four separable components.
According to another embodiment, wear ring has the clearance angle of a part of the thickness T by wear ring, thus, the axial groove being formed between wear ring is along along being seen as outward direction bifurcated from the center of screening unit, the thickness T of wear ring is corresponding to the extension of they radially R, and grinding ring also has the height H corresponding to they extensions of A vertically.In traditional design, have fiber and rotating the risk blocked between static wear ring.By making the such bifurcated of groove, decrease the abrasion on the risk that fiber blocks and the wear ring thus increased.
According to an embodiment, wear ring does not has corresponding clearance angle, so that they are rotatable on the opposite side of groove.When regulating tank, the alternative of the part changing wear ring or wear ring with new wear ring can be by a part for wear ring or wear ring/several part turnbacks, to form the new surface keeping intended groove size.
The invention still further relates to a kind of method using above-mentioned screening unit and screening structure to check and/or regulate at least one excircle axial groove, wherein, screening unit removes from screening structure, this groove/these grooves are examined and may be conditioned, and screening unit is subsequently returned to screen the position in structure.
Accompanying drawing explanation
The present invention and further purpose thereof and advantage can be best understood by, in the accompanying drawings with reference to the following description and drawings:
Fig. 1 is the schematic sectional view of the screening unit according to the present invention one exemplary embodiment；
Fig. 2 illustrates the signal longitudinal sectional view of the screening structure that screening unit is suitable for, and it does not exist the situation of screening unit as shown in Figure 1 in being shown in screening structure.
Fig. 3 is the schematic sectional view of the screening structure according to the present invention one exemplary embodiment, and it illustrates the situation that removable screening unit is in place in screening structure.
Fig. 4 illustrates and removes the screening unit according to the present invention/insert the screening unit according to the present invention according to the screening structure of the present invention from the screening structure according to the present invention.
Fig. 5 A-C illustrates the sectional view of the excircle axial groove of the exemplary embodiment according to the present invention, and wherein, Fig. 5 A is the enlarged drawing of institute's encirclement part in Fig. 4, and Fig. 5 B-C illustrates the exemplary embodiment about the surface forming groove.
Fig. 6 is the schematic flow diagram of the method for the groove in inspection and/or regulation screening structure according to the present invention one exemplary embodiment.
Detailed description of the invention
In the accompanying drawings, similar or corresponding element will be indicated by identical reference.
It should be noted that, although description below relates generally to combined sorting structure, wherein, in terms of the center of screening structure, fine screen is positioned at outside scalping, it is can also be applied to the structure of " inner side is outside ", i.e. fine screen is positioned at inside scalping.Therefore, scalping is positioned at the structure outside of the inner side outside fine screen within the scope of the invention.It is also noted that these teachings can be applicable to carry out the multistage screening member of some screening stages in same structure.Therefore, no matter whether multistage screening installation comprises scalping, and these teachings are all applicable.Screening plant in different phase can the opening with same size of e.g. same type.The screening plant of different phase the most also can have other change of opening size rather than must define scalping or fine screen respectively.
Screening unit 100 in Fig. 1 includes the stator 110 being arranged on bearing unit 111.The armature spindle 125 that rotor 121 is provided around being included in bearing unit 111 is rotatable.First screening plant 101 is arranged on rotor 121, and screening plant is arranged to together rotate with rotor 121.First screening plant 101 has cylindrical shape and is positioned at outside bearing unit 111 and stator 110 and coaxial about central axis C with it.Stator can be provided with multiple pulser 115, and these pulsers are arranged in when rotary type the first screening plant 101 rotates and produce for the pressure pulse cleaning the first screening plant 101.
Outer stationary parts 134 is arranged to work with rotor 121 1 and makes be intended to the stock suspension flow by the first screening plant 101 screening and be intended to the pulp suspension flow separation by the second screening plant screening, thus separates with screening unit 100 when operating in screening structure but cooperate therewith.The Part I 134a of outer stationary parts 134 is the circular cylindrical tubular device being coaxially disposed with the first screening plant 101, it has the diameter more than the first screening plant 101, thus, between screening plant 101 and the first outer stationary parts 134a, forming space, this space constitutes the first screening room 105.First outer stationary parts 134a is arranged to extend in upward direction, thus, quite a few of the first screening plant 101 by static tube around.In this figure, the first outer stationary parts 134a is connected to multiple spaced apart bar 135, and these bars are connected to bottom 131.Bottom is connected to bearing unit 111 radially extension between bearing unit 111 with the spaced apart bar 135 being connected to the first outer stationary parts 134a.Opening/groove between each bar enables access to interior axial groove 102, and this will be further described.Also by making the first outer stationary parts 134a extend downwardly into bottom 131 and to make its underpart be provided with the opening that can be substantial access to described interior axial groove 102 this close to realize.
First outer stationary parts 134a also has following function: when operation, forces paper pulp stream mainly to introduce the first screening room 105 near the upper part of the first screening plant 101.Stationary parts 134 also includes the second outer stationary parts 134b.Second outer stationary parts 134b is arranged to be directed on radial distance identical with outer rotatable parts 124 in terms of central axis C with its outermost part, when using the screening unit in screening structure, the second outer stationary parts 134b is used as the barrier of stream radially together with outer rotatable parts 124.According to an embodiment, the second outer stationary parts 134b is from holding means prominent for the first stationary parts 134a.
Excircle axial groove 122 is formed between the first opposing outer face 123 and the second opposing outer face 133.First opposing outer face 123 is positioned on outer rotatable parts 124, and the second opposing outer face is positioned on the second outer stationary parts 134b.Circumference axial groove 122 has the extension of radially R and the extension of A vertically, and correspondence the first and second surface that extension vertically forms groove by regulation is adjustable.Extension vertically defines the size of groove.According to preferred embodiment, the first apparent surface 123 of outer axial groove 122 and the second apparent surface 133 are circumference rings, these circumference rings have corresponding to they radially R extension thickness T and corresponding to the height H of they A extensions vertically.Circumference ring also can represent wear ring, this is because they are suitable to due to the abrasion of generation potential when being connected with groove exchange or change.Such as, can such regulating tank, i.e. by ring being adjusted to appropriate location, swivel becket to expose " new ", unworn surface, or by replacing the ring of abrasion with new ring.Thickness T by wear ring carrys out the extension of setting slot radially R.Regardless of the power that ring is suffered in the operating process of screening unit, thickness T is chosen to wear ring thickness to being enough to keep their original shape.If circumference ring can advantageously comprise stem portion, therefore, it is possible to easily remove.This design can also regulate, exchange or rotate only one specific part or some specific parts of circumference ring.
Forming inner periphery axial groove 102 between the first inner apparent surface 103 and the second inner apparent surface 113, apparent surface is connected respectively to inner rotatable part 104 and interior stationary parts 114.When screening unit operates in screening structure, inner rotatable part 104 is used for forming radially barrier together with interior stationary parts 114, and this barrier prevents the stream of the pulp suspension from the first screening room 105 from flowing to the first receiving room 106 without the first screening plant 101.
In fig. 2 it is shown that when about the screening unit described in Fig. 1 screen in structure the most in place time the screening structure according to the present invention.Screening structure includes screening shell 202 and being intended to the second screening plant 201 cooperated with about the screening unit 100 described in Fig. 1.Term filtering structure should be understood to describe the remainder when removable screening unit removes and the total when removable screening unit is in place in screening shell.Screening structure also includes that top cover 203(is as shown in Figure 3) and it is connected to the driver element (not shown) of armature spindle 125.
Fig. 3 illustrates the screening structure comprising removable screening unit.During operation, pulp suspension screened within two stages, first passed through the first screening plant 101.Then, the receptacle from the first screening stage is brought forward into the second screening stage；Screened by the second screening plant 201.Outer axial groove and interior axial groove 122 and 102 is formed between rotation and the stationary parts of screening structure.
During operation, paper pulp stream to be screened enters the first screening room 105 when entering screening structure via main pulp inlet 211, and then, paper pulp feeds towards the first screening plant 101.As it was previously stated, paper pulp is forced to flow up due to stationary parts 134, so that paper pulp mainly introduces the first screening room 105 at the adjacent upper part of the first screening plant 101.The fiber less than the opening size in perforation sieve plate through screening plant 101 and enters the first receiving room 106.Room is received to be limited by screening plant 101 and the stator 110 being positioned at screening plant 101.In embodiment shown here, screening is carried out from outside to inside, and due to the centrifugal force preventing the granule of massiveness to be in close contact with screening plant, this is particularly preferably when the first screening stage performs the task of separating predominantly bigger impurity (such as, tuberosity).This screening stage is commonly known as except joint device or Xie Jieqi (deknotter).
Discarded part, i.e. the granule being not passed through screening member takes out via the first waste outlet 212.Receiving portion is fed to the second screening room 205 further, to form the infusion to the second screening plant 201.Paper pulp through the second screening plant 201 takes out via receiving outlet 213, and waste part lease making is taken out by least one waste outlet (not shown in figures).Second screening plant 201 such as can perform task of mainly making fragment separate from fiber.
In one embodiment, screening structure also includes secondary pulp inlet 215, and this secondary pulp inlet is arranged to flow through the paper pulp of secondary pulp inlet 215 and mixed with the receptacle from the first screening plant 101 before entering the second screening plant 201.The paper pulp entering secondary inlet 215 is made up of the receiving portion from follow-up screening structure (not shown), and in this follow-up screening structure, the discarded part from the second screening plant 201 is screened again.The receptacle of follow-up screening structure forms the infusion to the second screening plant 201 together with the receptacle from the first screening structure 101.So, being included in and be brought back into, from " the good fiber " in the discarded part of the second screening plant 201, the paper pulp stream moved along it in this process, therefore, fiber loss minimizes.This secondary pulp inlet can be the type described in Swedish patent application 0900351-8.
In one embodiment, the first screening plant 101 is scalping, and the second screening plant 201 is fine screen.Term scalping refers to predominantly make the bigger magazins' layout of such as tuberosity and the screening member that designs.Typically, the diameter of opening can be 6-10 millimeter, usually 8-10 millimeter.The screening member that term fine screen refers to predominantly separate fragment from fiber and designs.For the fine screen of trough of belt, these grooves can be in the range of 0.15-0.60 millimeter, usually 0.15-0.40 millimeter.Groove or hole can be used according to technological parameter to be optimized.
Fig. 4 illustrates and removes removable screening unit from screening structure 200.Lifting bolt 126 is arranged on armature spindle 125 and A sees at armature spindle top end vertically.When lifting apparatus is connected to lifting bolt 126 and screening unit 100, removing the top cover 203 shown in Fig. 3, after pulling down from driver element, screening unit 100 is lifted up removing from screening structure 200.
Fig. 5 A-C illustrates the embodiment on the surface forming axial groove, and Fig. 5 A is the enlarged drawing in enclosed region in Fig. 4.Shown in Fig. 5 B and 5C, groove forms two embodiments on surface.In figure 5b, it is shown that the surface forming groove is provided with the alternate embodiment of clearance angle.This embodiment can advantageously be used in combination with outer axial groove 122.Fig. 5 C illustrates more conventional groove design.
Fig. 5 B illustrates the first outer apparent surface 123 and the second outer apparent surface 133, and the two apparent surface forms axial groove 122 between.Apparent surface has the extension T of the extension H and radially R of A vertically.
It is selected to it by the clearance angle of a part of thickness T and is large enough to obtain the effect preventing or at least reducing jammed fibre weight, but be not also large enough to affect the intensity of wear ring.If arranging the clearance angle by whole thickness, then sharpening forward ends will form surface formation at groove, thus be difficult to limit groove size to be regulated.Furthermore, it is possible to the whole periphery at circumferential slot has diameter change slightly, this is needed by selecting clearance angle not compensated by the whole thickness T of wear ring.That is, if the diameter of apparent surface is different in some site of collective perimeters, then in the case of sharpening forward ends, groove will be the biggest in this site.But, flat surfaces is the biggest, then mill the biggest compared with " rule cuts off (cleancut) " of the degree cut off and the fiber that will block.
The first screening plant 101 perform the function of the first screening stage and the first screening plant 101 be scalping embodiment in, outer axial groove 122 is generally more worn and torn by than corresponding interior axial groove 102.This is owing in the setting comparison of external axial groove 122, the setting of axial groove 102 is the strictest, and it is thus desirable to more closely sets.Owing to the opening of the first screening plant 101 is the most relatively large, within the ratio of axial groove 102 can be in the scope identical with opening.When this refers to outer axial groove 122, it is often more important that groove size is maintained at predetermined minimum range, to determine the generation less desirable mixing of each several part.Less groove size means that when fiber blocks the exposure risk between surface is bigger, and this causes potential wear problem.Therefore, the alternate embodiment shown in Fig. 5 B is combined particularly advantageous with outer axial groove 122.
Fig. 6 schematically illustrates at least one circumferential slot in the screening unit 100 checking and may regulating screening structure 200 by each step of method for expressing in frame.In the first step, screening unit is removed from screening structure.Second step includes checking around at least one in the circumferential hole of its periphery.Inspection can such as be implemented by visual inspection or measurement or a combination thereof.Notice discrepant with intended groove size in the case of, decide whether to carry out any regulation.If it is, take the measure according to third step.In the case of without noticing of difference, if or difference be considered as in acceptable tolerance, determine be probably and need not be adjusted.In the case, the 4th step will directly be implemented.In third step, existing about the many options how implementing required regulation, these options are in the accompanying drawings to be illustrated in phantom.A kind of alternative can be one or several the position in regulation apparent surface, so that groove size returns to its preliminary dimension.In the case of apparent surface includes removable wear ring, the second option can be to change one or several wear rings or the part of wear ring.Particularly include having the wear ring of the clearance angle on the both sides being arranged on wear ring apparent surface in the case of, the 3rd alternative is by the part turnback of wear ring or wear ring, and when completing regulating step, screening unit returns to screen in structure.
By the probability of the groove size of all circumferential slots outside permission regulation screening structure, groove size will not change due to the pressure, temperature variation when making screening structure run.Additionally, the whole periphery of outer axial groove can easily be checked.
Although describing the present invention with reference to specifically shown embodiment, but it is emphasized that it also covers the equivalent of disclosed feature and obviously revises to one skilled in the art and modification.Therefore, protection scope of the present invention is defined solely by the appended claims.
Claims (13)
1. the screening unit (100) used in screening structure (200), described screening unit (100) includes rotor (121), it is arranged to the first screening plant (101) rotated together with described rotor (121), it is arranged on the stator (110) within described first screening plant and is arranged on the bearing unit (111) of described stator interior, described rotor (121) is installed in rotation on described bearing unit (111), described screening unit is adapted for insertion into described screening structure (200) and removes from described screening structure (200), it is characterized in that,
Described screening unit includes excircle axial groove (122), described excircle axial groove is formed in the outer perimeter of described screening unit, between the first opposing outer face (123) and second opposing outer face (133) of outer stationary parts (134) of rotatable parts (124) outside
Described first opposing outer face (123) forming described excircle axial groove (122) is all located on the circumference of described screening unit (100) with described second opposing outer face (133), thus, when and/or removing removable described screening unit (100) from described screening structure (200) before removable screening unit (100) inserts described screening structure (200), energy is close and regulates described excircle axial groove (122), wherein said outer rotatable parts (124) are the parts of described rotor (121), and wherein said outer stationary parts (134) is connected to described bearing unit (111).
2. screening unit as claimed in claim 1, it is characterised in that
Described screening unit also includes inner periphery axial groove (102), described inner periphery axial groove is formed between first opposite inner face (103) of inner rotatable part (104) and second opposite inner face (113) of interior stationary parts (114), when and/or removing removable described screening unit (100) from described screening structure (200) before removable screening unit (100) inserts described screening structure (200), energy is close and regulates described inner periphery axial groove (102), described inner rotatable part (104) is described first screening plant (101), and described interior stationary parts (114) is the parts being connected with described bearing unit (111).
3. screening unit as claimed in claim 2, it is characterised in that
Form described circumference axial groove (102, 122) corresponding described first opposite inner face (103), described second opposite inner face (113), described first opposing outer face (123) and described second opposing outer face (133) have the extension of radially R and A vertically, and form corresponding described first opposite inner face (103) of described circumference axial groove, described second opposite inner face (113), described first opposing outer face (123) and described second opposing outer face (133) are arranged in terms of the central axis C of described first screening plant (101) about corresponding circumference axial groove (102, 122) it is directed in couples on substantially the same radial distance.
4. screening unit as claimed in claim 3, it is characterised in that
At least one in described first opposite inner face (103), described second opposite inner face (113), described first opposing outer face (123) and described second opposing outer face (133) of described correspondence includes circumferentially disposed removable wear ring.
5. screening unit as claimed in claim 4, it is characterised in that
The first opposing outer face (123) and the second opposing outer face (133) that form the described correspondence of described excircle axial groove (122) include circumferentially disposed removable wear ring.
6. screening unit as claimed in claim 4, it is characterised in that
At least one in described wear ring has at least one of clearance angle by thickness T, thus, the described circumference axial groove (102 being formed between described wear ring, 122) at least one in is along outwardly direction bifurcated in terms of the center of described screening unit (100), described thickness T is corresponding to the extension of described wear ring radially R, and described wear ring also has corresponding to them along the height H of the extension of described axial A.
7. screening unit as claimed in claim 6, it is characterised in that
At least one wear ring described has not towards the corresponding clearance angle on the opposite side of described circumference axial groove, so that described wear ring can rotate.
8. screening unit as claimed in claim 4, it is characterised in that
Described wear ring includes the most separable at least two parts, to easily remove described wear ring when changing.
9. one kind is used for the screening structure (200) of screen fibre element paper pulp within two or more stages, described screening structure includes at least the first and second screening plants (101 surrounded by shell (202), 201), described first and second screening plants are coaxially disposed with central axis C, it is characterized in that, described screening structure includes according to the screening unit according to any one of claim 1-8, described screening unit can remove from described shell, described first and second opposing outer face (123, 133) it is arranged to one work so that the pulp suspension being intended to be screened by described second screening plant (201) is separated with the pulp suspension being intended to by described first screening plant (101) is screened.
Screen structure the most as claimed in claim 9, it is characterised in that
Described first screening plant (101) is disposed partially to be positioned at described second screening plant (201).
11. 1 kinds for checking and/or regulating the method according at least one the circumference axial groove (122,102) in the screening structure (200) described in claim 9 or 10, it is characterised in that
Removing described screening unit (100) from described screening structure (200), described screening structure includes screening shell (202) and the second screening plant (201),
Check and/or regulate the first opposite inner face (103), the first opposing outer face (123) and the second opposite inner face (113) outside described screening shell (202), at least one in the second opposing outer face (133), thus, described circumference axial groove (122,102) obtains predetermined groove size；And
Described screening unit (100) is forwarded to the position in the described screening shell (202) of described screening structure (200).
12. methods as claimed in claim 11, it is characterised in that
At least one of described first opposite inner face (103), described second opposite inner face (113), described first opposing outer face (123) and described second opposing outer face (133) includes wear ring, and the part of described wear ring or described wear ring is rotated 180 degree.
13. methods as claimed in claim 12, it is characterised in that
At least one described first opposite inner face (103), described second opposite inner face (113), described first opposing outer face (123) and described second opposing outer face (133) include wear ring, and the part of described wear ring or described wear ring is changed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0901591A SE534497C2 (en) | 2009-12-21 | 2009-12-21 | Screening unit, screening device and method for inspection / adjustment of an axial gap |
| SE0901591-8 | 2009-12-21 | ||
| PCT/SE2010/051366 WO2011078764A1 (en) | 2009-12-21 | 2010-12-13 | Unit, arrangement and method for screening of cellulose pulp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102666978A CN102666978A (en) | 2012-09-12 |
| CN102666978B true CN102666978B (en) | 2016-08-03 |
Family
ID=44196021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080058093.3A Active CN102666978B (en) | 2009-12-21 | 2010-12-13 | Unit, structures and methods for screen fibre element paper pulp |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2516734B1 (en) |
| CN (1) | CN102666978B (en) |
| BR (1) | BR112012015644B1 (en) |
| CA (1) | CA2782867C (en) |
| SE (1) | SE534497C2 (en) |
| WO (1) | WO2011078764A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3245535A (en) * | 1963-05-23 | 1966-04-12 | Cowan Ben | Vertical pressure type pulp screen |
| FI79394B (en) * | 1988-05-24 | 1989-08-31 | Ahlstroem Oy | Procedure for sealing an end piece of a rotary body in a silo and sealing system used in the procedure |
| SE509134C2 (en) * | 1997-04-14 | 1998-12-07 | Sunds Defibrator Ind Ab | Screening device with reject dilution |
| WO2000052260A1 (en) * | 1999-03-04 | 2000-09-08 | Valmet Fibertech Ab | Screening apparatus |
| WO2000061861A1 (en) * | 1999-04-08 | 2000-10-19 | Valmet Fibertech Ab | Screening apparatus with slotring moveable in axial direction |
| CN2623743Y (en) * | 2003-01-29 | 2004-07-07 | 中国轻工业武汉设计院 | United pressure screen |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5575395A (en) * | 1994-07-15 | 1996-11-19 | A. Ahlstrom Corporation | Method and apparatus for screening fibrous suspensions |
| SE512957C2 (en) * | 1999-03-29 | 2000-06-12 | Valmet Fibertech Ab | Screening device with a rotatable and stationary screen means |
-
2009
- 2009-12-21 SE SE0901591A patent/SE534497C2/en unknown
-
2010
- 2010-12-13 EP EP10839885.0A patent/EP2516734B1/en active Active
- 2010-12-13 CA CA2782867A patent/CA2782867C/en active Active
- 2010-12-13 CN CN201080058093.3A patent/CN102666978B/en active Active
- 2010-12-13 BR BR112012015644-6A patent/BR112012015644B1/en active IP Right Grant
- 2010-12-13 WO PCT/SE2010/051366 patent/WO2011078764A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3245535A (en) * | 1963-05-23 | 1966-04-12 | Cowan Ben | Vertical pressure type pulp screen |
| FI79394B (en) * | 1988-05-24 | 1989-08-31 | Ahlstroem Oy | Procedure for sealing an end piece of a rotary body in a silo and sealing system used in the procedure |
| SE509134C2 (en) * | 1997-04-14 | 1998-12-07 | Sunds Defibrator Ind Ab | Screening device with reject dilution |
| WO2000052260A1 (en) * | 1999-03-04 | 2000-09-08 | Valmet Fibertech Ab | Screening apparatus |
| WO2000061861A1 (en) * | 1999-04-08 | 2000-10-19 | Valmet Fibertech Ab | Screening apparatus with slotring moveable in axial direction |
| CN2623743Y (en) * | 2003-01-29 | 2004-07-07 | 中国轻工业武汉设计院 | United pressure screen |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102666978A (en) | 2012-09-12 |
| WO2011078764A1 (en) | 2011-06-30 |
| EP2516734A4 (en) | 2013-06-05 |
| EP2516734A1 (en) | 2012-10-31 |
| CA2782867A1 (en) | 2011-06-30 |
| CA2782867C (en) | 2017-11-07 |
| BR112012015644B1 (en) | 2021-01-26 |
| BR112012015644A2 (en) | 2016-05-10 |
| SE0901591A1 (en) | 2011-06-22 |
| EP2516734B1 (en) | 2019-08-14 |
| SE534497C2 (en) | 2011-09-13 |
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Address after: Espoo Finland Applicant after: Veimeide Technology Co., Ltd. Address before: Helsinki Applicant before: Metso Paper Inc. |
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