CN110924214A - Rolling type bar screen cylinder - Google Patents
Rolling type bar screen cylinder Download PDFInfo
- Publication number
- CN110924214A CN110924214A CN201911365172.8A CN201911365172A CN110924214A CN 110924214 A CN110924214 A CN 110924214A CN 201911365172 A CN201911365172 A CN 201911365172A CN 110924214 A CN110924214 A CN 110924214A
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- pulp
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- bar
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- 238000005096 rolling process Methods 0.000 title claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000003466 welding Methods 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000003908 quality control method Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- D21D5/16—Cylinders and plates for screens
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a rolling type bar screen cylinder which comprises a plurality of vertical bars uniformly arranged around the circumferential direction, wherein the top of each vertical bar screen cylinder is provided with an upper flange for fixing the top of each vertical bar, the bottom of each vertical bar screen cylinder is provided with a lower flange for fixing the bottom of each vertical bar, and the middle part of each vertical bar screen cylinder is sequentially provided with a plurality of middle rings for fixing the middle part of each bar from top to bottom; the width of the flow dredging part is larger than that of the mounting part in the circumferential direction, so that a screen slot with a narrow inlet is formed between two adjacent vertical bars; when the equipment preparation, at first with whole vertical stick pegs graft on the bar body after, vertical stick medial surface forms an integral face, and the bar body outside forms an integral face, then rolls up the system and form, and wherein the bar body is rolled up and is formed the zhonghuan, and all vertical sticks are enclosed and are closed and form the screen drum barrel, and whole manufacture is simple, and compact structure is firm, need not the welding, has avoided appearing the emergence of the big phenomenon of hanging the thick liquid resistance in the welding point department.
Description
Technical Field
The invention belongs to the technical field of manufacturing of papermaking pressure screens, and particularly relates to a rolling type bar screen cylinder which is applied to a papermaking pressure screen and used for screening light and heavy impurities in paper pulp, improving the yield and quality of good pulp of the paper pulp and ensuring the yield and quality of finished paper.
Background
At the present stage, the pressure screen is used as the most extensive screening equipment in the pulping line of the domestic paper making industry, the technology of the pressure screen is mature day by day, domestic manufacturers are introduced from the beginning technology and gradually transition to technical innovation, and the pressure screen is adjusted from all aspects to be more suitable for domestic paper making enterprises.
The screen cylinder is used as a core component of the pressure screen and is the key of the screening performance of the equipment. Screen cylinder opening patterns also transition from the earliest round hole screen cylinders to plate-milled screen cylinders to the bar screen cylinders used today. For example, in the book 29, the 4 th paragraph of "paper making science and technology" 2010 of the china journal, quality control in the manufacturing process of a bar-type pressure screen cylinder is disclosed, which is explained in the context of quality control in the manufacturing process of a bar-type pressure screen cylinder, and includes structural composition of a pressure screen cylinder, quality control in the processing process of screen cylinder parts, quality control in the welding and overall processing process of a screen cylinder group, quality detection of a finished screen cylinder product, and the like. Chinese patent publication No. CN204455700U discloses a bar formula coarse screen cylinder, including stick and screen cylinder body, form the screen cut between stick and the stick, still include solid fixed ring, reinforcing ring, gu fixed ring sets up between the screen cylinder body, gu be equipped with the recess on the fixed ring, the stick sets up in the recess, the recess with be equipped with the sealing washer between the stick, the screen cylinder body includes screen cylinder body and lower screen cylinder body, go up the screen cylinder body with can dismantle the connection between the screen cylinder body down, the tip and the reinforcing ring fixed connection of stick, the tip of stick with the reinforcing ring is overall molded structure. The invention has the beneficial effects that: the rotor can adapt to high-strength rotation of the rotor, welding is not used, the weight is light, and the overall power consumption is reduced; the lower part of the screen cylinder which is seriously damaged can be replaced, and the production cost is reduced.
Chinese patent, publication No. CN102182096A, discloses a spliced bar screen cylinder, which mainly solves the problems of complex production process, difficult processing and poor precision of the existing screen cylinder. The screen cylinder is cylindrical and is provided with a plurality of reinforcing rings, and bars are distributed on the periphery of the reinforcing rings to form a screen-shaped cylinder; the first bar comprises a first fixing part and a first turbulent flow part; the second bar comprises a second fixing part and a second turbulent flow part. The improved screen cylinder has simple manufacturing process, and the sections of the two bars are simple geometric shapes, so that the screen cylinder is convenient to process; the precision is high, the radial and axial errors caused by the processing and the installation of tooth grooves are avoided, the circumferential accumulated error and the radial runout of the corrugation of the screen cylinder are improved, and the production efficiency of the screen cylinder is improved.
The shape of the bars, the connection mode of the bars and the fixing rings, and the difference of the screen gaps formed between the bars all affect the motion state of the pulp flow, the screening quality of the pulp and the service life of the whole body, so that the bars need to be optimally designed.
Disclosure of Invention
The invention aims to provide a rolling type bar screen cylinder; the technical scheme adopted for achieving the purpose is as follows:
a rolling type bar screen drum comprises a plurality of vertical bars which are uniformly arranged around the circumferential direction, an upper flange used for fixing the tops of the vertical bars is arranged at the top, a lower flange used for fixing the bottoms of the vertical bars is arranged at the bottom, a plurality of middle rings used for fixing the middle parts of the bars are sequentially arranged at the middle parts from top to bottom, slots used for assembling the vertical bars are correspondingly arranged on the inner walls of the middle rings around the circumferential direction, the vertical bars are divided into a flow dispersing part and an installing part from inside to outside in the radial direction, the installing part is clamped in the slots, the installing part and the slots are fixedly connected through a clamping pair, the clamping pair comprises an arc-shaped convex column arranged along the vertical direction and an arc-shaped groove clamped and matched with the arc-shaped convex column, one of the arc-shaped convex column and the arc-shaped groove and the inner wall of the slot are integrally formed, and; the width of the flow-dredging part is larger than that of the mounting part in the circumferential direction, so that a narrow-inlet screen slot is formed between two adjacent vertical bars.
Preferably, one side surface of the flow dredging part of the vertical bar in the circumferential direction is a pulp facing surface, the other side surface of the flow dredging part of the vertical bar is a pulp backing surface, the inner side surface of the vertical bar is an inner top surface, the pulp facing surface extends inwards in an inclined mode towards the rotation direction of the screen cylinder, the pulp backing surface extends inwards in an inclined mode towards the rotation direction of the screen cylinder, and the inner top surface extends inwards in an inclined mode from the pulp backing surface towards the pulp facing surface.
Preferably, the inclination of the pulp facing surface is greater than that of the pulp backing surface, and the length of the pulp facing surface is greater than that of the pulp backing surface; thereby forming a narrow inlet of the screen slot between the top part of the back pulp surface and the middle part of the adjacent pulp facing surface.
Preferably, the bottom of the slot is an arc-shaped bottom surface, and the bottom shape of the mounting part is matched with the shape of the arc-shaped bottom surface.
Preferably, chamfers are arranged between the inner top surface and the pulp facing surface and between the inner top surface and the pulp backing surface for transitional connection.
Preferably, the clamping pair comprises two arc-shaped convex columns arranged along the vertical direction and two arc-shaped grooves corresponding to the arc-shaped convex columns and matched in clamping, and when the two arc-shaped convex columns are symmetrically distributed on the inner wall of the slot and manufactured integrally with the slot, the two arc-shaped grooves are symmetrically distributed on two side faces of the installation part.
Preferably, the clamping pair comprises two arc-shaped convex columns arranged along the vertical direction and two arc-shaped grooves corresponding to the arc-shaped convex columns and matched in clamping, and when the two arc-shaped grooves are symmetrically distributed on the inner wall of the slot, the two arc-shaped convex columns are symmetrically distributed on two side faces of the installation part and are integrally formed with the installation part.
The invention has the following beneficial effects: (1) the screen gap formed between two adjacent vertical bars has the structural characteristics of narrow inlet and gradually widened rear end channel, so that the slurry flow is not easy to form turbulent flow when passing through the screen gap, can more quickly pass through the screen cylinder and is not easy to wind and block the screen cylinder;
(2) a narrow inlet of a screen slot is formed between the top in the pulp backing surface and the middle of the adjacent pulp facing surface, and a pulp buffer area is formed at the inner side of the narrow inlet, so that the pulp can further smoothly pass through the screen cylinder under the extrusion action of the pulp in the buffer area, and the screen cylinder is not easy to be wound and blocked;
(3) the arc-shaped grooves on the vertical bar mounting part have the function of being in plug-in fit with the slots on one hand, and on the other hand, two opposite arc-shaped grooves form a buffer area or a negative pressure area in the middle of the screen gap, so that the slurry flow is guided, the flow speed is accelerated, the slurry can smoothly pass through the screen cylinder, and the screen cylinder is not easy to be wound and blocked;
(4) the conical section grooves of the inserting grooves have a centering and limiting effect on the vertical bars, and the straight section grooves have a fixing and reinforcing effect on the vertical bars, so that the assembly positions and the postures of the vertical bars are accurately fixed, and the uniformity of screen gaps is improved;
(5) the inner top surface is obliquely arranged at different angles, so that small rotational flow formed when slurry flows of different slurry types pass through the inner top surface can just enter a screen gap, small turbulent flow can be formed at the tail part of the fluid when the fluid passes through the convex inclined surface, the size of the turbulent flow is determined by the angle of the inclined surface and the slurry type, different angles adapt to different slurry types, and the adjustment of the inclination angle can ensure that the size of the turbulent flow just enables fibers to smoothly enter the screen gap; on the other hand, the inner top surface is provided with the wear-resistant material treatment layer, so that the service life and the wear resistance of the screen cylinder are improved;
(6) when the equipment preparation, at first with whole vertical stick pegs graft on the bar body after, vertical stick medial surface forms an integral face, and the bar body outside forms an integral face, then rolls up the system and form, and wherein the bar body is rolled up and is formed the zhonghuan, and all vertical sticks are enclosed and are closed and form the screen drum barrel, and whole manufacture is simple, and compact structure is firm, need not the welding, has avoided appearing the emergence of the big phenomenon of hanging the thick liquid resistance in the welding point department.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial structural view of the middle ring;
FIG. 3 is an enlarged view of the dashed box portion of FIG. 2;
fig. 4 is a schematic view of the structure of the vertical bar.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 4, a rolling bar screen cylinder comprises a plurality of vertical bars 4 uniformly arranged around the circumference, an upper flange 5 for fixing the top of the vertical bar 4 is arranged at the top, a lower flange 1 for fixing the bottom of the vertical bar 4 is arranged at the bottom, a plurality of middle rings 2 used for fixing the middle parts of the bars 4 are sequentially arranged at the middle parts from top to bottom, slots 6 used for assembling the vertical bars 4 are correspondingly arranged on the inner walls of the middle rings 2 around the circumferential direction, the vertical bar 4 is divided into a flow dredging part 9 and an installation part 7 from inside to outside in the radial direction, the installation part 7 is clamped in the slot 6, the installation part 7 is fixedly connected with the slot 6 through a clamping pair, the clamping pair comprises an arc-shaped convex column 12 and an arc-shaped groove 17, the arc-shaped convex column 12 and the arc-shaped groove 17 are arranged in the vertical direction and are in clamping fit with the arc-shaped convex column 12, one of the arc-shaped convex column 12 and the arc-shaped groove 17 is integrally formed with the inner wall of the slot 6, and the other is integrally formed with the side wall; the width of the flow-guiding part 9 is larger than the width of the mounting part 7 in the circumferential direction so as to form a screen slot 8 with a narrow inlet 10 between two adjacent vertical bars 4.
The specific shape of the vertical bar 4 is as follows, one side surface of the flow dredging part 9 of the vertical bar 4 in the circumferential direction is a pulp facing surface 16, the other side surface is a pulp backing surface 14, the inner side surface of the vertical bar 4 is an inner top surface 15, the pulp facing surface 16 extends obliquely inwards towards the rotation direction M of the screen cylinder, the pulp backing surface 14 extends obliquely inwards towards the opposite direction of the rotation of the screen cylinder, and the inner top surface 15 extends obliquely inwards from the pulp backing surface 14 towards the pulp facing surface 16; wherein, the inclination of the pulp facing surface 16 is greater than that of the pulp backing surface 14, and the length of the pulp facing surface 16 is greater than that of the pulp backing surface 14; so that a narrow inlet 10 of the screen slot 8 is formed in the pulp-backing surface 14 between the top and the middle of the adjacent pulp-facing surface 16.
The bottom of the slot 6 is an arc bottom surface, the bottom shape of the installation part 7 is matched with the arc bottom surface 18 of the arc bottom surface, and the arc contact surface is smooth and has small resistance, so that the vertical bar 4 is subjected to resistance when being inserted into the slot 6 from top to bottom.
Meanwhile, chamfers are arranged between the inner top surface 15 and the pulp facing surface 16 and between the inner top surface 15 and the pulp backing surface 14 for transitional connection, so that paper pulp flows more smoothly, and the pulp hanging phenomenon is not easy to occur.
In this embodiment, the clamping pair includes two arc-shaped convex columns 12 arranged along the vertical direction and two arc-shaped grooves 17 corresponding to the arc-shaped convex columns 12 and matched with the clamping, and when the two arc-shaped convex columns 12 are symmetrically distributed on the inner wall of the slot 6 and are integrally formed with the slot 6, the two arc-shaped grooves 17 are symmetrically distributed on two side surfaces of the mounting portion 7.
In order to improve the service life and the wear resistance of the screen cylinder, a wear-resistant material treatment layer is arranged on the inner top surface 15; the middle ring 2 at the highest layer can be welded on the upper flange 5, the middle ring 2 at the lowest layer is welded on the lower flange 1, and the top and the bottom of the vertical bar 4 are correspondingly welded on the upper flange 5 and the lower flange 1.
When the screen drum is assembled and manufactured, all the vertical bars are inserted into the bar-shaped body, the inner side faces of the vertical bars form an integral face, the outer side of the bar-shaped body forms an integral face, and then the screen drum is rolled to form the screen drum, wherein the bar-shaped body is rolled to form a middle ring, and all the vertical bars are enclosed to form the screen drum body. When the invention is used, the upper flange 1 and the lower flange 3 are correspondingly arranged in the papermaking pressure screen equipment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Claims (7)
1. A rolling type bar screen drum comprises a plurality of vertical bars which are uniformly arranged in the circumferential direction, an upper flange used for fixing the tops of the vertical bars is arranged at the top, a lower flange used for fixing the bottoms of the vertical bars is arranged at the bottom, and a plurality of middle rings used for fixing the middle parts of the bars are sequentially arranged in the middle from top to bottom; the width of the flow-dredging part is larger than that of the mounting part in the circumferential direction, so that a narrow-inlet screen slot is formed between two adjacent vertical bars.
2. The rolled bar screen cylinder according to claim 1, wherein one side surface of the flow dispersing part of the vertical bar in the circumferential direction is a pulp facing surface, the other side surface of the flow dispersing part of the vertical bar is a pulp backing surface, the inner side surface of the vertical bar is an inner top surface, the pulp facing surface extends obliquely and inwardly towards the rotation direction of the screen cylinder, the pulp backing surface extends obliquely and inwardly towards the opposite direction of the rotation of the screen cylinder, and the inner top surface extends obliquely and inwardly from the pulp backing surface to the pulp facing surface.
3. The rolled bar screen cylinder according to claim 2, wherein the inclination of the pulp facing surface is greater than the inclination of the pulp backing surface, and the length of the pulp facing surface is greater than the length of the pulp backing surface; thereby forming a narrow inlet of the screen slot between the top part of the back pulp surface and the middle part of the adjacent pulp facing surface.
4. The rolled bar screen cylinder according to any one of claims 1 to 3, wherein the bottom of the slot is an arc-shaped bottom surface, and the bottom shape of the mounting portion matches the shape of the arc-shaped bottom surface.
5. The rolled bar screen cylinder according to claim 2 or 3, wherein chamfers are arranged between the inner top surface and the pulp facing surface and between the inner top surface and the pulp backing surface for transitional connection.
6. The rolling type bar screen cylinder according to claim 5, wherein the clamping pair comprises two arc-shaped convex columns arranged along the vertical direction and two arc-shaped grooves correspondingly clamped and matched with the arc-shaped convex columns, and when the two arc-shaped convex columns are symmetrically distributed on the inner wall of the slot and integrally formed with the slot, the two arc-shaped grooves are symmetrically distributed on two side surfaces of the installation part.
7. The rolling type bar screen cylinder according to claim 5, wherein the clamping pair comprises two arc-shaped convex columns arranged along the vertical direction and two arc-shaped grooves correspondingly clamped and matched with the arc-shaped convex columns, and when the two arc-shaped grooves are symmetrically distributed on the inner wall of the slot, the two arc-shaped convex columns are symmetrically distributed on two side surfaces of the installation part and are integrally formed with the installation part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365172.8A CN110924214A (en) | 2019-12-26 | 2019-12-26 | Rolling type bar screen cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365172.8A CN110924214A (en) | 2019-12-26 | 2019-12-26 | Rolling type bar screen cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110924214A true CN110924214A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911365172.8A Pending CN110924214A (en) | 2019-12-26 | 2019-12-26 | Rolling type bar screen cylinder |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111962323A (en) * | 2020-08-10 | 2020-11-20 | 玖龙纸业(天津)有限公司 | Improve pressure screen of thick liquids screening quality |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5799798A (en) * | 1996-08-23 | 1998-09-01 | Chen; Chao-Ho | Screen cylinder for screening high consistency pulp |
| CN2455755Y (en) * | 2000-12-26 | 2001-10-24 | 温州银翼造纸筛选设备有限公司 | High strength screen drum structure with slanting gaps |
| CN205152712U (en) * | 2015-11-26 | 2016-04-13 | 张庆祥 | Screen drum |
| CN205821888U (en) * | 2016-06-06 | 2016-12-21 | 维美德技术有限公司 | Screen cylinder and paper machine |
| WO2019101429A1 (en) * | 2017-11-22 | 2019-05-31 | Voith Patent Gmbh | Screen |
| CN211471959U (en) * | 2019-12-26 | 2020-09-11 | 郑州运达造纸设备有限公司 | Rolling type bar screen cylinder |
-
2019
- 2019-12-26 CN CN201911365172.8A patent/CN110924214A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5799798A (en) * | 1996-08-23 | 1998-09-01 | Chen; Chao-Ho | Screen cylinder for screening high consistency pulp |
| CN2455755Y (en) * | 2000-12-26 | 2001-10-24 | 温州银翼造纸筛选设备有限公司 | High strength screen drum structure with slanting gaps |
| CN205152712U (en) * | 2015-11-26 | 2016-04-13 | 张庆祥 | Screen drum |
| CN205821888U (en) * | 2016-06-06 | 2016-12-21 | 维美德技术有限公司 | Screen cylinder and paper machine |
| WO2019101429A1 (en) * | 2017-11-22 | 2019-05-31 | Voith Patent Gmbh | Screen |
| CN211471959U (en) * | 2019-12-26 | 2020-09-11 | 郑州运达造纸设备有限公司 | Rolling type bar screen cylinder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111962323A (en) * | 2020-08-10 | 2020-11-20 | 玖龙纸业(天津)有限公司 | Improve pressure screen of thick liquids screening quality |
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