CN112323529B - Screw shaft for washing pulp wood knots and slag washing machine - Google Patents
Screw shaft for washing pulp wood knots and slag washing machine Download PDFInfo
- Publication number
- CN112323529B CN112323529B CN202011139538.2A CN202011139538A CN112323529B CN 112323529 B CN112323529 B CN 112323529B CN 202011139538 A CN202011139538 A CN 202011139538A CN 112323529 B CN112323529 B CN 112323529B
- Authority
- CN
- China
- Prior art keywords
- pipe body
- fixed
- guide plate
- pulp
- guide plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002023 wood Substances 0.000 title claims abstract description 43
- 238000005406 washing Methods 0.000 title claims abstract description 30
- 239000002893 slag Substances 0.000 title claims description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 230000001174 ascending effect Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 abstract description 17
- 239000002245 particle Substances 0.000 abstract description 12
- 230000000630 rising effect Effects 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- 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
Abstract
The invention discloses a screw shaft for washing pulp wood knots, which comprises a pipe body, wherein a plurality of openings are distributed on the pipe body, and nozzles are arranged on the openings; the top end of the pipe body is sealed and fixed by a steel rod; the outer surface of the tube body is sequentially fixed with a guide plate, an axial guide plate and a half helical blade from bottom to top; each guide plate is upwards inclined, is in ascending spiral circumferential distribution on the periphery of the pipe body, and two adjacent guide plates are spaced; the axial guide plates are rectangular steel plates, at least two axial guide plates are axially parallel to the pipe body, and the axial guide plates are vertically fixed on the periphery of the pipe body along the long edge; the periphery of the axial guide plate is fixed with a rising spiral blade, and the upper tail part of the spiral blade is fixed with the outer wall of the pipe body; the plurality of half spiral blades are arranged in a rising spiral shape and fixed on the outer wall of the pipe body, and a space is reserved between the head and the tail of each two adjacent half spiral blades. The screw shaft for washing the pulp wood knots can effectively separate heavier particles in a pulp mixture, cut larger wood knots and reduce screen wear and equipment running resistance.
Description
Technical Field
The invention belongs to the field of pulp cleaning, and particularly relates to a screw shaft for pulp wood knot cleaning and a slag washer.
Background
Particulate matter in the pulp, such as undissolved wood chips, large knots or stones, which can damage equipment downstream in the pulp manufacturing line, must be removed. The pulp knots can be washed to remove wood chips and big knots, and the good fibers are recovered and sent to screening equipment. In the washing process, the rotating spiral blades carry the pulp to move upwards, particles in the pulp are stirred and washed by the spiral shaft, then flow through a screen mesh outside the spiral shaft for screening and filtering, coarse slag is remained in the screen mesh, pulp fiber liquid flows into a good pulp port through a screen mesh and enters downstream screening equipment of a production line, and therefore the pulp wood node fiber is washed.
The screw shaft used in the prior art node washing machine or slag washing machine is a pipe body with continuous constant pitch or continuous variable pitch helical blades, and the screw shaft can not effectively break up and separate particles. When the content of the particles in the paper pulp is more and the particles are larger, partial particles and fiber clusters which cannot be scattered in time are conveyed to the upper part of the pipe body by the screw shaft to cause net drop or slurry piling, so that the meshes of the screen mesh are worn, the coarse slag content in the discharged good slurry is higher, the running resistance of equipment is increased, and the energy consumption is increased.
Disclosure of Invention
The invention aims to provide a screw shaft and a slag washer for washing pulp knots, which can effectively break up or separate large particles in the pulp knots in the washing process.
The technical scheme of the invention is as follows: the screw shaft for washing the pulp wood knots comprises a pipe body, wherein a plurality of openings are distributed on the pipe body, and nozzles are arranged on the openings; the top end of the pipe body is fixed in a sealing way by a steel rod; the outer surface of the pipe body is sequentially fixed with a guide plate, an axial guide plate and a semi-spiral blade from bottom to top; at least four guide plates are arranged, each guide plate is inclined upwards, is distributed on the periphery of the pipe body in the circumferential direction of an ascending spiral, and is spaced between two adjacent guide plates; the axial guide plates are rectangular steel plates, at least two axial guide plates are axially parallel to the pipe body, and the axial guide plates are vertically fixed on the periphery of the pipe body along the long side; the periphery of the axial guide plate is fixed with ascending helical blades, and the upper tail parts of the helical blades are fixed with the outer wall of the pipe body; the plurality of half-helical blades are sequentially arranged and spirally fixed on the outer wall of the pipe body in an ascending mode, and a space is reserved between the head part and the tail part of each two adjacent half-helical blades.
In the pulp wood section washing process, the screw shaft rotates to drive the pulp wood section mixture to move upwards in a screw way, meanwhile, water is introduced from the bottom end of the pipe body and is sprayed out through each nozzle to wash the pulp wood section mixture, and particles with larger specific gravity (such as stones) fall from the intervals among the guide plates when flowing through the guide plates, and are separated and discharged; the slurry and the lighter wood knots continue to move upwards towards the axial guide plate under the rotation of the screw shaft, and continue to move upwards under the rotation of the screw blades at the periphery of the axial guide plate, and meanwhile, the slurry and the lighter wood knots are cut and scattered by the axial guide plate, and heavier particles can also fall down and be separated by gaps between the screw blades and the pipe body. The slurry which is continuously moved upwards and a small amount of large wood knots which are not broken are moved to the positions of the semi-spiral blades, and the large wood knots are further cut and moved upwards under the shearing of the head and the tail of the two adjacent semi-spiral blades due to the interval between the head and the tail of the adjacent semi-spiral blades, and finally are filtered to flow out. Under the action of the screw shaft for washing the pulp wood knots, stones and big wood knots in the pulp wood knots washing mixture are separated, broken or cut, so that the coarse slag content in the pulp is reduced, and the abrasion of a screen and the running resistance of equipment are reduced.
Preferably, the number of the openings is not less than ten, the openings are spirally distributed on the pipe body, and the injection angle of the nozzle is 10-30 degrees.
Preferably, the guide plate is an arc-shaped steel plate, and the concave surface of the guide plate is an upward groove.
Preferably, the half helical blade has a length of less than half a cycle. The length of one cycle of the helical blade means the length of one revolution of the helical blade around the central axis; the half-helical blade length is less than half a cycle, meaning that the half-helical blade rotates less than half a cycle about the central axis.
Preferably, the distance between the head and the tail of two adjacent half spiral blades is 100-120mm.
Preferably, a limiting ring is fixed on the periphery of the pipe body, and the limiting ring is arranged below all the guide plates.
Preferably, the bottom end of the pipe body is fixed with an end plate in a sealing manner, and the end plate is provided with a liquid inlet.
The invention also provides a slag washer for washing the pulp wood knots, which comprises the screw shaft.
The beneficial effects of the invention are as follows:
the screw shaft for washing the pulp wood knots can effectively separate heavier particles in a pulp mixture, break up or cut larger wood knots, so that the obtained pulp has low coarse slag content and small abrasion of a screen and resistance to running of equipment.
Drawings
Fig. 1 is a schematic view of the structure of a screw shaft for pulp pitch washing of example 1.
Fig. 2 is a perspective view of fig. 1.
FIG. 3 is a schematic structural view of the slag washer of the present invention.
In the figure:
1. a tube body; 11. an opening; 12. a nozzle; 13. a steel bar; 2. a deflector; 3. a helical blade; 4. an axial guide plate; 5. a semi-helical blade; 51. a first half helical blade; 52. a second helical blade; 6. a limiting ring; 7. an end plate; 71. a liquid inlet hole; 8. a housing; 81. a heavy slag port; 82. a slurry inlet; 83. a good slurry port; 84. a coarse slag hole; 85. positioning a clamping table; 86. a water inlet pipe; 9. a screen; 10. a gear motor.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
Fig. 1 is a schematic view showing a structure of a screw shaft for washing pulp knots according to the present embodiment, and fig. 2 is a perspective view of fig. 1. As shown in fig. 1 and 2, the screw shaft for washing pulp knots of the present embodiment comprises a pipe body 1, wherein a plurality of openings 11 are distributed on the pipe body 1, and the area of each opening is 1mm 2 The total area of all openings is larger than the inner cavity sectional area of the tube body 1. The opening 11 is provided with a nozzle 12, and the injection angle of the nozzle 12 is 30 °. The top end of the pipe body 1 is fixed in a sealing way by a steel rod 13; the outer surface of the pipe body 1 is sequentially fixed with a guide plate 2, an axial guide plate 4 and a half helical blade 5 from bottom to top. The number of the guide plates 2 is four, the guide plates are arc-shaped steel plates, and the concave surfaces of the arc-shaped guide plates are upward grooves. Four guide plates are upwards inclined and are distributed on the periphery of the pipe body 1 in a rising spiral circumferential direction, two adjacent guide plates 2 are spaced, and the arc grooves of the four arc guide plates form a break in the middleSpaced ascending spiral-shaped flow channels. The axial guide plates 4 are rectangular steel plates, two axial guide plates 4 parallel to the axial direction of the pipe body 1 are fixed on the periphery of the pipe body 1, and the two axial guide plates 4 are vertically fixed on the periphery of the pipe body 1 along the long side. The periphery of the axial guide plate 4 is fixed with ascending helical blades 3, and the upper tail parts of the helical blades 3 are fixed with the outer wall of the pipe body 1. A plurality of half helical blades 5 are arranged on the pipe body 1 above the helical blades 3, the length of each half helical blade is 1/4 period, the plurality of half helical blades are sequentially arranged and spirally fixed on the outer wall of the pipe body 1 in an ascending mode, the distance between the head and the tail of two adjacent half helical blades is 100mm, and the distance between the tail of each half helical blade 51 and the head of each half helical blade 52 is 100mm in fig. 2.
Fig. 3 is a schematic structural view of a slag washer using the above screw shaft for pulp pitch washing of the present embodiment. As shown in fig. 3, a gear motor 10 is arranged above the slag washer, and the rotating shaft of the gear motor 10 is fixedly connected with a steel rod 13 of the screw shaft. A housing 8 is provided on the outer periphery of the screw shaft. The periphery of the pipe body 1 is fixedly provided with a limiting ring 6, the limiting ring 6 is arranged below all the guide plates 2, and the screw shaft is clamped and fixed on a positioning clamping table 85 at the lower part of the shell 8 through the limiting ring 6. A slurry inlet 82, a slurry outlet 83 and a coarse slag outlet 84 are sequentially arranged on the side wall of the shell 8 from bottom to top. The slurry inlet 82 is arranged at a position which is flush with or slightly above the lowest deflector, and the coarse slag inlet 84 is arranged at the upper tail part of the semi-spiral blade 5. A screen 9 is further arranged between the shell 8 and the screw shaft, and the screen 9 is positioned above the slurry inlet 82 and below the coarse slag port 84 and seals the fine slurry port 83; the heavy slag hole 81 is arranged at the bottom of the shell 8. The bottom end of the pipe body 1 is fixedly provided with an end plate 7 in a sealing manner, the end plate is provided with a liquid inlet hole 71, and a water inlet pipe 86 at the bottom of the shell is communicated with the liquid inlet hole 71.
When the pulp wood section is washed, the pulp wood section mixture to be washed is introduced through the pulp inlet 82, the gear motor 10 is started, the gear motor 10 drives the steel rod 13 to rotate, the whole screw shaft rotates spirally, the pulp wood section mixture moves upwards under the rotation of the screw shaft, meanwhile, water is introduced from the liquid inlet hole 71 at the bottom end of the pipe body 1 through the water inlet pipe 86, and the water is sprayed upwards through the nozzles 12 on the pipe body 1 to wash the pulp wood section mixture. Since the spray angle of the spray nozzle is 30 degrees, spray-shaped water flow is formed in the whole shell from bottom to top along the spiral shaft to clean the spiral-rising pulp wood knot mixture. At this time, heavy particles (such as stones or knots) are washed and sunk in the washing process, fall from gaps among the guide plates when flowing through the guide plates, gradually sink to the bottom of the shell 8 and are discharged through the heavy slag hole 81, so that the screen 9 and other parts are prevented from being damaged in the subsequent washing and filtering process; the pulp and the lighter big wood knots in the pulp wood knot mixture continue to move upwards towards the axial guide plate 4 under the rotation of the screw shaft, and continue to move upwards under the rotation of the screw blades 3 at the periphery of the axial guide plate 4, and are cut and broken up by the axial guide plate 4, and heavier particles can also fall down from the heavy slag hole 81 by the clearance between the screw blades 3 and the pipe body 1; the slurry which is continuously moved upwards and a small amount of large wood knots which are not broken are moved to the position of the half spiral blade 5, and the large wood knots are further cut and moved upwards under the shearing of the head end and the tail end of the half spiral blade 5 due to the distance of 100mm between the head end and the tail end of the adjacent half spiral blade 5, and finally are filtered by the screen 9 to flow out from the good pulp port 83. The unfiltered coarse slag continues to move upward and is discharged through the coarse slag notch 84 at the tail of the semi-spiral blade 5.
The guide plate in this embodiment is the arc steel sheet, and the concave surface of guide plate upwards presents the recess that rises, and the arc recess of four arc guide plates has formed the ascending spiral shape runner that has the disconnection interval in the middle, more is favorable to the flow of the downhill of pulp wood knot mixture, has reduced the resistance that upwards flows.
In the embodiment, under the action of the screw shaft for washing the pulp knots, the slag washer separates and discharges heavier impurities such as stones and the like in the pulp knots mixture from a heavy slag port; the large knots in the pulp knots mixture are scattered or cut, the coarse slag content in the obtained pulp is small, and the abrasion of the screen mesh and the resistance of equipment operation are reduced.
Example 2
The present example and example 1 do notThe same is that the pitch between the head and the tail of the half-spiral blade of the spiral shaft for pulp wood knot washing in the embodiment is 200mm, and the injection angle of the nozzle is 10 degrees; the deflector 2 in this embodiment is a flat steel plate, and the half helical blade used has a length of 2/5 cycles. The area of the single opening is 20mm 2 The total area of all openings is larger than the inner cavity sectional area of the pipe body.
The screw shaft for washing the pulp wood knots in the embodiment is suitable for a slag washer with a larger shell, and the shell of the slag washer is larger in size, so that the washed pulp wood knots are more mixed, the head-tail interval of the used half screw blade is larger, the length of the used half screw blade is smaller, and the length is 2/5 cycles. The larger head-tail interval of the half spiral blades and the smaller half spiral blade length are both in order to be more beneficial to cutting of a large amount of pulp wood knots, and prevent excessive pulp wood knot plugs from rotating in the half spiral blade interval and being incapable of cutting. The spray angle of the nozzle was also 10 ° in order to allow the wash water to be sprayed to the pulp wood mixture farther from the axis of the housing. The area of the single opening is 20mm 2 And the pulp wood knot mixture is sufficiently cleaned in order to obtain more water.
In the embodiment, the slag washer separates and discharges heavy impurities such as stones in the pulp wood section mixture from a heavy slag port; the large knots in the pulp knots mixture are scattered or cut, so that the coarse slag content in the obtained pulp is low, and the abrasion of the screen mesh and the running resistance of equipment are reduced.
The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described above may be combined with each other as long as they do not collide with each other. In addition, the foregoing is only a partial embodiment, and not all embodiments, of the present invention, and all other embodiments obtained by those skilled in the art without making any creative effort based on the embodiments of the present invention are within the protection scope of the present invention. For example, the outer periphery of the pipe body is not provided with a limiting ring, and the screw shaft can be fixedly arranged on the shell through accurate positioning. The bottom of the pipe body is not provided with an end plate, and the water inlet pipe is directly communicated with the pipe body in a sealing way, so that the description is omitted.
Claims (4)
1. A slag washer for washing pulp wood knots, which is characterized by comprising a screw shaft; the screw shaft comprises a pipe body, a plurality of openings are distributed on the pipe body, and nozzles are arranged on the openings; the top end of the pipe body is fixed in a sealing way by a steel rod; the outer surface of the pipe body is sequentially fixed with a guide plate, an axial guide plate and a semi-spiral blade from bottom to top;
the guide plate is an arc-shaped steel plate, and the concave surface of the guide plate is an upward groove; at least four guide plates are arranged, each guide plate is inclined upwards, is distributed on the periphery of the pipe body in the circumferential direction of an ascending spiral, and is spaced between two adjacent guide plates;
the axial guide plates are rectangular steel plates, at least two axial guide plates are axially parallel to the pipe body, and the axial guide plates are vertically fixed on the periphery of the pipe body along the long side; the periphery of the axial guide plate is fixed with ascending helical blades, and the upper tail parts of the helical blades are fixed with the outer wall of the pipe body;
the length of the half-spiral blade is less than half period; the plurality of half-spiral blades are sequentially arranged and spirally fixed on the outer wall of the pipe body in an ascending manner, and a space is reserved between the head part and the tail part of two adjacent half-spiral blades;
and a limiting ring is fixed on the periphery of the pipe body, and the limiting ring is arranged below all the guide plates.
2. The slag washer for washing pulp knots according to claim 1, wherein the number of openings is not less than ten, and the openings are spirally distributed on the pipe body; the injection angle of the nozzle is 10-30 degrees.
3. A slag washer for pulp pitch washing as recited in claim 1, wherein the spacing between the head and tail of adjacent two of said semi-spiral blades is 100-120mm.
4. The slag washer for washing pulp wood knots according to claim 1, wherein the bottom end of the pipe body is fixed with an end plate in a sealing manner, and the end plate is provided with a liquid inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011139538.2A CN112323529B (en) | 2020-10-22 | 2020-10-22 | Screw shaft for washing pulp wood knots and slag washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011139538.2A CN112323529B (en) | 2020-10-22 | 2020-10-22 | Screw shaft for washing pulp wood knots and slag washing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112323529A CN112323529A (en) | 2021-02-05 |
| CN112323529B true CN112323529B (en) | 2024-03-12 |
Family
ID=74310983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011139538.2A Active CN112323529B (en) | 2020-10-22 | 2020-10-22 | Screw shaft for washing pulp wood knots and slag washing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112323529B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4650125A (en) * | 1982-10-15 | 1987-03-17 | Escher Wyss Gmbh | Method for sorting fiber stock, especially for manufacturing paper, and sorting apparatus for the performance of such method |
| US5338451A (en) * | 1992-03-13 | 1994-08-16 | A. Ahlstrom Corporation | Apparatus for treating pulp |
| US5341826A (en) * | 1992-04-07 | 1994-08-30 | Hans Huber Gmbh | Apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants |
| CN1412386A (en) * | 2001-10-16 | 2003-04-23 | 倪均达 | Paper pulp, plastics and impurity separation machine |
| CN102303943A (en) * | 2011-08-17 | 2012-01-04 | 无锡市彩云机械设备有限公司 | Sludge drier auger |
| CN105712605A (en) * | 2016-04-22 | 2016-06-29 | 上海同臣环保有限公司 | Novel stacked screw sludge dewatering machine and spiral shaft thereof |
| CN207357138U (en) * | 2017-08-17 | 2018-05-15 | 洛阳市华工实业有限公司 | A kind of reaction kettle of built-in deflector and Auger helical blade |
| CN213836073U (en) * | 2020-10-22 | 2021-07-30 | 新乡市新平航空机械有限公司 | A screw axis and slag washing machine for washing of paper pulp knar |
-
2020
- 2020-10-22 CN CN202011139538.2A patent/CN112323529B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4650125A (en) * | 1982-10-15 | 1987-03-17 | Escher Wyss Gmbh | Method for sorting fiber stock, especially for manufacturing paper, and sorting apparatus for the performance of such method |
| US5338451A (en) * | 1992-03-13 | 1994-08-16 | A. Ahlstrom Corporation | Apparatus for treating pulp |
| US5341826A (en) * | 1992-04-07 | 1994-08-30 | Hans Huber Gmbh | Apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants |
| CN1412386A (en) * | 2001-10-16 | 2003-04-23 | 倪均达 | Paper pulp, plastics and impurity separation machine |
| CN102303943A (en) * | 2011-08-17 | 2012-01-04 | 无锡市彩云机械设备有限公司 | Sludge drier auger |
| CN105712605A (en) * | 2016-04-22 | 2016-06-29 | 上海同臣环保有限公司 | Novel stacked screw sludge dewatering machine and spiral shaft thereof |
| CN207357138U (en) * | 2017-08-17 | 2018-05-15 | 洛阳市华工实业有限公司 | A kind of reaction kettle of built-in deflector and Auger helical blade |
| CN213836073U (en) * | 2020-10-22 | 2021-07-30 | 新乡市新平航空机械有限公司 | A screw axis and slag washing machine for washing of paper pulp knar |
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| Publication number | Publication date |
|---|---|
| CN112323529A (en) | 2021-02-05 |
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