WO2019061010A1

WO2019061010A1 - Device for washing paper pulp

Info

Publication number: WO2019061010A1
Application number: PCT/CN2017/103354
Authority: WO
Inventors: 李�昊
Original assignee: 深圳德为智造科技有限公司
Priority date: 2017-09-26
Filing date: 2017-09-26
Publication date: 2019-04-04
Also published as: CN110139958A

Abstract

A device for washing a paper pulp, comprising a roller extrusion mechanism (100) and a pulp transport mechanism (200). The roller extrusion mechanism (100) comprises a master roller (101) and a plurality of sub-rollers (102), the sub-rollers (102) being provided along the circumferential direction of the master roller (101) around the central axis of the master roller (101), and the sub-rollers (102) abutting against the master roller (101) in a radial direction and forming corresponding nips (103). The pulp transport mechanism (200) comprises a pulp transport mesh assembly (201), the pulp transport mesh assembly (201) being loaded with paper pulp and transporting same between the master roller (101) and each of the sub-rollers (102), and the paper slurry being washed in the nips (103). Less sub-rollers (102) are used for obtaining the same nips (103), and the nips (103) are distributed in a vertical direction, making the overall structure more compact.

Description

Title of Invention: Equipment for washing pulp

Technical field

[0001] The present invention relates to the technical field of pulp washing, and more particularly to an apparatus for washing pulp.

Background technique

[0002] In the production of fiber-based products, the fiber-based pulp is washed by means of a roll structure. In the prior art, the two pressure roller sets are arranged in the upper and lower opposite directions, and the respective sub-rollers of each pressure roller group are arranged to be washed in the radial direction. Thus, the number of nips of the two press rolls is proportional to the number of sub-rolls. It is understood that each nip is positioned one above the other to obtain a nip. Then, for each additional nip, two sub-rolls are required. Therefore, not only the equipment manufacturing cost is high, the overall cost of the equipment is high, and the power consumption is large.

technical problem

[0003] An object of embodiments of the present invention is to provide an apparatus for washing pulp to solve the relationship between the number of nips of the existing roller-type structural equipment and the number of press rolls, thereby causing the washing equipment The problem of high cost.

Problem solution

Technical solution

[0004] In order to solve the above technical problem, the technical solution adopted by the embodiment of the present invention is:

[0005] An apparatus for washing pulp is provided, and the apparatus for washing pulp comprises: a roll pressing mechanism and a slurry transfer mechanism:

[0006] The roll pressing mechanism includes a mother roll and a plurality of sub-rolls, the mother roll is horizontally disposed, and a cross section of the mother roll in a radial direction is parallel to a gravity vertical surface, and each of the sub-rollers is The central axis of the mother roller is centered along the circumferential direction of the mother roller, and the cross section of each of the sub-rollers in the radial direction is parallel to the vertical plane of gravity, and each of the sub-rollers is in the radial direction with the female roller Abutting against each other and forming a corresponding nip;

[0007] The slurry transfer mechanism includes a slurry transfer net group, the slurry transfer net group loading pulp is transferred between the mother roll and each of the sub-rollers, and the pulp is in the nip The washing operation is completed. Advantageous effects of the invention

Beneficial effect

[0008] In comparison with the prior art, the apparatus for cleaning pulp pulp provided by the present invention has the following advantages: The apparatus for washing pulp, including a roll press mechanism and a slurry transfer mechanism. The roller extrusion mechanism includes a mother roller and a plurality of sub-rollers, the mother roller is horizontally disposed, and the cross section of the mother roller in the radial direction is parallel to the gravity vertical surface, and each sub-roller is centered on the center axis of the mother roller along the circumferential direction of the mother roller. It is arranged that the cross section of each sub-roller in the radial direction is parallel to the vertical plane of gravity, and each sub-roller abuts against the mother roll in the radial direction and forms a corresponding nip. Under the transfer of the slurry transfer net group, the pulp is transferred between the mother roll and each of the sub-rolls in the vertical direction, and the washing action is completed at the corresponding nip. Thus, in the case of obtaining the same nip, the number of sub-rollers is selected to be smaller and the cost is lower, and the nips are distributed in the vertical direction, so that the overall structure of the apparatus for pulp washing is more compact. , Small footprint.

Brief description of the drawing

DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are merely Some embodiments of the present invention may also be used to obtain other drawings based on these drawings without departing from the prior art.

1 is a schematic structural view of an apparatus for washing pulp according to an embodiment of the present invention;

2 is a schematic structural view of an apparatus for washing pulp according to another embodiment of the present invention.

[0012] wherein the reference numerals in the drawings are as follows:

[0013] 100—roll extrusion mechanism, 200—slurry transfer mechanism, 101—mother roll, 102—sub roll, 103—nip, 201_slurry transfer net group, 202_single net transfer belt, 203_ Return roller, 2021_slurry input section, 2022_slurry washing section, 2023_empty section, 204_water tray, 300_bleeding device, 202a_A material end, 20215_ discharge end, 400_collection device, 401_scraper, 402_collection box, 205_Internet transmission group, 206_lower network transmission group, 207_online transmission belt, 208_first auxiliary roller, 209_lower network conveyor belt, 210_second auxiliary roller 205a_A, 20515_ discharge, 2071_first output, 2072_first wash, 2073_first turn, 2091_second output, 2092_second wash, 2093_second turn Segment, 211 - collection component, 212_ upper scraper, 213_ lower scraper, 214 A reverse washing mechanism, 215-spray assembly, 216-washing process section, 217-wastewater collection assembly, 2171_wiping knife, 2172_water collecting tray.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0015] It should be noted that when a component is referred to as being "fixed" or "in" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or indirectly connected to the other component.

[0016] It should be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it is understood that if the terms "upper" and "lower" The orientation or positional relationship of the "," "left", "right" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and the simplified description, and does not indicate or imply the indicated device or component. It is necessary to have a specific orientation and construction and operation in a specific orientation. Therefore, the terms used to describe the positional relationship in the drawings are for illustrative purposes only and are not to be construed as limiting the patent. The specific meaning of the above terms is understood on a case-by-case basis.

In addition, the terms "first" and "second" are used for descriptive purposes only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more unless specifically and specifically defined.

[0018] In order to explain the technical solution of the present invention, an implementation of the apparatus for washing pulp provided by the present invention in conjunction with the specific drawings will be described in detail by way of specific embodiments.

Referring to FIG. 1, an apparatus for washing pulp according to an embodiment of the present invention includes a roll extrusion mechanism 100 and a slurry transfer mechanism 200:

[0020] The roll pressing mechanism 100 includes a mother roll 101 and a plurality of sub-rollers 102, the mother roll 101 is horizontally disposed and the cross section of the mother roll 101 in the radial direction is parallel to the gravity vertical surface, and each sub-roller 102 is made of the mother roll 101. The central axis is centered along the circumferential direction of the mother roll 101, and the cross section of each of the sub-rollers 102 in the radial direction is parallel to the vertical plane of gravity, each The sub-roller 102 abuts against the mother roll 101 in the radial direction and forms a corresponding nip 103;

[0021] The slurry transfer mechanism 200 includes a slurry transfer net group 201, and the slurry transfer net group 201 carries the pulp between the mother roll 101 and the respective sub-rollers 102, and the pulp finishes the washing operation at the nip 103.

[0022] An apparatus for washing pulp according to an embodiment of the present invention includes a roll press mechanism 100 and a slurry transfer mechanism 200. The roll pressing mechanism 100 includes a mother roll 101 and a plurality of sub-rollers 102. The mother roll 101 is horizontally disposed and the cross section of the mother roll 101 in the radial direction is parallel to the gravity vertical surface, and each sub-roller 102 is centered on the center axis of the mother roll 101. The center is disposed along the circumferential direction of the mother roll 101, and the cross section of each of the sub-rollers 102 in the radial direction is parallel to the vertical plane of gravity, and each of the sub-rollers 102 abuts against the mother roll 101 in the radial direction and forms a corresponding nip. 103. Under the transfer of the slurry transfer net group 201, the pulp is transferred between the mother roll 101 and each of the sub-rollers 102 in the vertical direction, and the washing operation is completed at the corresponding nip 103. Thus, in the case where the same nip 103 is obtained, the number of sub-rollers 102 is selected to be smaller and the cost is lower, and at the same time, the nips 103 are distributed in the vertical direction, so that the apparatus for washing the pulp as a whole The structure is more compact and the footprint is small.

[0023] In the present embodiment, the apparatus for pulp washing can also realize the yarn dividing treatment of the web. Since the line contact between each of the sub-rollers 10 2 and the mother roll 101 is increased, when the line pressure between each of the sub-rollers 102 and the mother roll 101 is increased, the web is conveyed to each nip 103 by the slurry transfer net group 201. At the point where the wire is processed, the line pressure can be set to 800 kg/cm to 10000 kg/cm, and for the washing machine, the line pressure is between 20 kg/cm and 800 kg/cm.

Specifically, referring to FIG. 1, in the present embodiment, the slurry transfer net group 201 includes a single net transfer belt 202 and a returning roller 203, and the returning roller 203 is disposed adjacent to the mother roller 101, and the single net transport belt 202 A transmission loop is formed between the returning roller 203 and the mother roller 101. The return roller 203 is for providing transmission power such that the single-wire transfer belt 202 is cyclically driven between the return roller 203 and the mother roller 101, and the pulp is transported on the side of the single-wire transfer belt 202 toward the mother roller 101, and in each nip. At 103, the washing operation is performed.

[0025] Specifically, referring to FIG. 1, the single-network transmission belt 202 includes a slurry input section 2021, a slurry washing section 2022, and an empty section 2023, a slurry input section 2021, a slurry washing section 2022, and an empty section 2023. The closed loop structure is formed by connecting end to end in sequence, and the slurry washing section 2022 is disposed between the mother roll 101 and each of the sub-rollers 102. Here, the pulp takes the slurry input section 2021 as a transmission starting point, and as the single-web conveyor belt 202 is transported between the returning roller 203 and the mother roller 101, the pulp is transferred to the slurry washing section 2022, and, at the mother roller 101 and each The washing is performed in the nip 103 between the sub-rolls, and the washed pulp is detached from the slurry washing section 2022 to remove the paper. The slurry washing section 2022 of the slurry forms an empty section 2023, and the returning roll 203 is transported to the transfer starting point, thus completing a washing cycle.

Further, referring to FIG. 1, in the embodiment, the slurry transfer net group 201 further includes a water receiving tray 204, and the water receiving tray 204 is located below the slurry input section 2021. The function of the water receiving tray 204 is to recover the waste liquid from which the pulp flows out of the slurry input section 2021.

[0027] Further, referring to FIG. 1, in the present embodiment, the apparatus for washing pulp is further included to include a pulping apparatus 300. The slurry input section 2021 includes a feed end 202a and a discharge end 202b opposite to the feed end 202a. Here, the feed end 202a defining the slurry input section 2021 is adjacent to the return roll 203, and the discharge end of the slurry input section 2021. 202b is adjacent to the mother roller 101. The slurry discharging device 300 is disposed above the feeding end 202a. Of course, the slurry discharging device 300 can also be installed above the discharging end 202b according to actual needs.

[0028] Further, referring to FIG. 1, in the present embodiment, the apparatus for washing pulp is further included in the collecting device 400. The collecting device 400 includes a doctor blade 401 and a collecting box 402, the doctor blade 401 is located above the discharge end 202b, and the doctor blade 401 abuts against the circumferential roller of the mother roller 101, and the collecting box 402 is set at the squeegee Below the knife 401. Since the pulp is dehydrated by washing and attached to the mother roll 101, it is necessary to scrape the washed and dehydrated pulp by the squeegee 401 and collect it in the collecting box 402. Here, the orientation of the blade of the doctor blade 401 is opposite to the direction in which the mother roller 101 is rotated about the axis of the roller body, so that the pulp attached to the roller of the mother roller 101 is easily removed.

[0029] Alternatively, referring to FIG. 2, the difference from the above embodiment is that the slurry transport network group 201 includes a network transmission group 205 and a lower network transmission group 206, and the pulp is disposed in the Internet transmission group 205 and the downlink transmission group 206. Between, and, the pulp is transmitted by the Internet transmission group 205 and the lower network transmission group 206 to each nip 103. Here, the double-network transmission of the pulp is carried out by using the Internet transmission group 205 and the lower network transmission group 206 to improve the reliability and stability of the pulp transmission.

Specifically, referring to FIG. 2, the Internet transmission group 205 includes an Internet transmission belt 207 and a plurality of first auxiliary rollers 206. The first auxiliary roller 208 functions to limit the transmission direction of the Internet transmission belt 207. The lower net transport group 206 includes a lower net transport belt 209 and a plurality of second auxiliary rollers 210, the second auxiliary roller 210 functioning to define the transport direction of the lower net transport belt 209. The internet transmission belt 207 forms a first transmission loop around the mother roller 101 and each of the first auxiliary rollers 208, and the lower mesh conveyor belt 209 forms a second transmission loop around each of the sub-rollers 102 and each of the second auxiliary rollers 210. The transmission loop and the second transmission loop are sequentially arranged from top to bottom in the vertical direction, and An inlet port 205a and a discharge port 205b opposite to the inlet port 205a are formed between the first transfer circuit and the second transfer circuit. The pulp enters from the feed port 205a, and is discharged from the discharge port 205b after the washing is completed.

[0031] Specifically, referring to FIG. 2, in the embodiment, the internet transmission belt 207 includes a first output section 2071, a first washing section 2072, and a first turning section 2073. The first output section 2071, the first washing section 2072, and the first turning section 2073 are sequentially connected end to end to form a closed loop structure, and the first washing section 2072 is disposed between the mother roll 101 and each of the sub-rollers 102. Preferably, the number of the first auxiliary rollers 208 is three, and the internet transmission belt 207 is driven around the first auxiliary rollers 208 and the mother roller 101, wherein the internet transmission belt 207 before being transmitted into the nips 103 is The first output section 2071, the Internet transmission belt 207 transmitted between the nips 103 is a first washing section 2072, and the Internet transmission belt 207 transmitting the nips 103 is a first rotating section 2073, and the first output section 2 071 The first washing section 2072 and the first rotating section 2073 are sequentially alternated under the transfer of the mother roller 101 and each of the first auxiliary rollers 208, that is, the pulp finishes the washing operation only at the first washing section 2072.

[0032] Specifically, referring to FIG. 2, the lower net conveyor belt 209 includes a second output section 2091, a second washing section 2092, and a second turning section 2093. The second output section 2091, the second washing section 2092, and the second turning section 2093 are joined end to end to form a closed loop structure. The second washing section 2092 is in contact with the first washing section 2072 and is disposed between the female roll 101 and each of the sub-rollers 102. Preferably, the number of the second auxiliary rollers 210 is four, and the lower net transport belt 209 is driven around the second auxiliary rollers 210 and the respective sub-rollers 102, wherein the lower nets before being transported into the respective nips 103 are transmitted. The belt 209 is the second output section 2091, the lower net conveyor belt 209 transported between the nips 103 is the second washing section 2092, and the lower net conveyor belt 209 conveying the nips 103 is the second turning section 2093, The two output sections 2091, the second washing section 2092 and the second rotating section 2093 are sequentially alternated under the transport of the respective sub-rollers 102 and the respective second auxiliary rollers 210, that is, the pulp is only in the first washing section 2072 and the second washing section 20 92. The washing action is completed under the clamping action.

[0033] Preferably, referring to FIG. 2, in the embodiment, the second output section 2091 and the first output section 2071 are at an angle and form an inlet port 205a, a second turning section 2093 and a first turning section. A discharge port 20 5b is formed between 2073. The angle between the second output section 2091 and the first output section 2071 facilitates the placement of the pulp. The pulp which has been washed is discharged from the discharge port 205b.

[0034] Further, referring to FIG. 2, in an embodiment, the apparatus for washing pulp further includes a charging assembly 211. The charging assembly 211 includes an upper scraper 212 and a lower scraper 213, and the upper scraper 212 is located at the discharge port. 205b and abuts against the first rotating section 2073, the lower scraper 213 is located at the discharge opening 205b and abuts against the second rotating section 2093. . Since the pulp is pressed onto the first rotating section 2073 and the second rotating section 2093 after being pressed by the mother roller 101 and each of the sub-rollers 102, the upper rotating blade 212 and the lower scraping blade 213 are respectively used to collect the first rotating section 2073. The pulp on the second revolution section 2093. Specifically, the cutter head of the upper scraper 212 faces opposite to the transport direction of the first swivel section 2073, so as to facilitate the removal of the pulp attached to the first swivel section 2073, and the cutter head of the lower scraper 213 faces the second swivel section 2093. The conveying direction is opposite, and it is convenient to remove the pulp attached to the second rotating section 2093.

[0035] Further, referring to FIG. 1 and FIG. 2, the apparatus for washing pulp includes a reverse washing mechanism 214. The reverse washing mechanism 214 includes a plurality of spray assemblies 215 for spraying toward the corresponding nips 103. A washing step 216 is formed between each two adjacent nips 103. A shower assembly 21 is provided at each washing step 216. And, the spray direction of each spray assembly 215 is opposite to the transport direction of the slurry transfer net group 201. Specifically, the pulp is pressed and dehydrated by forming the nip 103 by the first sub-roller 102 and the mother roll 101. The pulp of the first press has a high dryness, and the dryness is generally between 20% and 50<3⁄4, and needs to be re-applied. The washing water is sprayed to facilitate washing in the next sub-roller 102 and the parent roll 101 forming nip 103. The function of each sprinkling assembly 215 is to replenish the corresponding nip 103 with washing water. Thus, after multiple presses and spray washing, the finished pulp is output through the slurry transfer net group 201. Specifically, the shower assembly 215 includes a showerhead and a water pipe that supplies wash water to the showerhead.

[0036] Further, referring to FIG. 1 and FIG. 2, the reverse washing mechanism 214 further includes a plurality of wastewater collection assemblies 217, each of which is provided with a wastewater collection assembly 217 and corresponding to the shower assembly 215, each wastewater The collecting assembly 217 includes a wiper blade 2171 and a water collecting plate 2172. The wiper blade 2171 is located at a circumferential direction of the roll body of the mother roll 101 and abuts against the slurry transfer net group 201. The water collecting plate 2172 is disposed on the wiper blade 2171. Below, each spray assembly 215 communicates with the water collection tray 2172 at the next wash operation interval 216 in the direction of transport of the slurry transfer network 201. Thus, the wiper blade 2171 introduces the waste water from the pulp in the nip 103 into the water collecting tray 21 72, that is, collects it in the water collecting tray 2172, and then washes the upper nip 103 by using the waste water in the water collecting tray 2172. The pulp is used to realize the recycling of waste water and save costs. Specifically, the jetting assembly disposed at the end washing process section 216 is operated independently, that is, the spray component 215 at that portion sprays fresh pulp washing water to the pulp output from the penultimate nip 103, thereby ensuring the final nip 103. The output pulp is not contaminated by wastewater.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For the technology in the field The invention is susceptible to various modifications and changes. Any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

Claim

[Claim 1] An apparatus for washing pulp, characterized in that the apparatus for washing pulp comprises a roll press mechanism and a slurry transfer mechanism:

The roll press mechanism includes a mother roll and a plurality of sub-rolls, the mother roll is horizontally disposed, and a cross section of the mother roll in a radial direction is parallel to a gravity vertical surface, and each of the sub-rollers is a mother roll The central axis is centered along the circumferential direction of the mother roller, and the cross section of each of the sub-rollers in the radial direction is parallel to the vertical plane of gravity, and each of the sub-rollers abuts the mother roller in a radial direction and Forming a corresponding nip;

The slurry transfer mechanism includes a slurry transfer net group, the slurry transfer net group loading pulp is transferred between the mother roll and each of the sub-rollers, and the pulp is washed at the nip Pulp action.

[Claim 2] The apparatus for washing pulp according to claim 1, wherein the slurry transfer net group comprises a single net transfer belt and a returning roll, the returning roll and the mother roll Adjacently disposed, the single-wire transfer belt forms a transmission loop around the returning roller and the female roller

[Claim 3] The apparatus for washing pulp according to claim 2, wherein the single-wire transfer belt comprises a slurry input section, a slurry washing section, and an empty section, the slurry The input section, the slurry washing section and the empty section are sequentially connected end to end to form a closed annular structure, and the slurry washing section is disposed between the mother roller and each of the sub-rollers.

[Claim 4] The apparatus for washing pulp according to claim 3, wherein the slurry transfer net group further comprises a water receiving tray, and the water receiving tray is located at the slurry input section Below.

[Claim 5] The apparatus for washing pulp according to claim 3, wherein the apparatus for washing pulp comprises a slurry discharging device, and the slurry input section includes a feeding material And a discharge end opposite to the feed end, the slurry discharge device is disposed above the feed end.

[Claim 6] The apparatus for washing pulp according to claim 5, wherein: the apparatus for washing pulp comprises a collecting device, the collecting device comprising a doctor blade and collecting a cartridge, the doctor blade is located above the discharge end and abuts against a circumferential roller of the mother roller, and the collection box is disposed below the doctor blade. The apparatus for washing pulp in a pulp according to claim 1, wherein: the slurry transport network group comprises an internet transmission group and a lower network transmission group, and the pulp is disposed on the internet transmission group and the lower network. The transmission groups are transmitted by the Internet transmission group and the downlink transmission group to each of the nips.

The apparatus for washing pulp in a pulp according to claim 7, wherein: said internet transmission group comprises an internet transmission belt and a plurality of first auxiliary rollers, and said lower network transmission group comprises a lower network transmission belt and a second auxiliary roller, the internet transmission belt is formed on the mother roller and each of the first auxiliary rollers to form a first transmission circuit, and the lower mesh transmission belt is wound around each of the sub-rollers and each of the first Forming a second transmission loop on the second auxiliary roller, the first transmission loop and the second transmission loop are sequentially arranged from top to bottom in a vertical direction, and the first transmission loop and the second transmission An inlet port and a discharge port opposite to the inlet port are formed between the circuits.

The apparatus for slurry washing pulp according to claim 8, wherein: said lower net conveyor belt comprises a first output section, a first washing section and a first turning section, said first output section, said The first washing section and the first rotating section are sequentially connected end to end to form a closed annular structure, and the first washing section is disposed between the mother roller and each of the sub-rollers.

The apparatus for washing pulp in a pulp according to claim 9, wherein: said net transmission belt comprises a second output section, a second washing section and a second turning section, said second output section, said The second washing section and the second rotating section are sequentially connected end to end to form a closed annular structure, and the second washing section and the first washing section are in contact with each other and are evenly disposed on the mother roller and each of the sub-rollers between.

The apparatus for washing pulp according to claim 10, wherein: the second output section and the first output section are at an angle and form the inlet, the second The discharge port is formed between the swivel section and the first swivel section.

The apparatus for washing pulp in a pulp according to claim 10, wherein: ???said apparatus for washing pulp comprises a collecting assembly, said collecting unit comprising an upper squeegee and a lower squeegee, said upper squeegee Located at the discharge opening and abutting against the first rotating section, the lower scraping blade is located at the discharge opening and abuts against the second rotating section. [Claim 13] The apparatus for washing pulp according to any one of claims 1 to 12, wherein: the apparatus for washing pulp comprises a reverse washing mechanism, the reverse washing The mechanism includes a plurality of shower assemblies for spraying toward the corresponding nip, a washing process interval is formed between each two adjacent nips, and each of the washing steps is provided with a shower assembly, and The spray direction of each of the shower assemblies is opposite to the transport direction of the slurry transport net group.

[Claim 14] The apparatus for washing pulp according to claim 13, wherein: the reverse washing mechanism further comprises a plurality of wastewater collection assemblies, wherein each of the washing process sections is provided with the wastewater Collecting components and corresponding to the spray assembly, each of the waste water collection assemblies includes a wiper blade and a water collecting plate, the wiper blade being located at a circumferential direction of the roll body of the mother roll and abutting against the slurry The water collecting tray is disposed under the wiper blade, and each of the shower assemblies is connected to the next washing step interval along a conveying direction of the slurry transporting net group The water collecting tray.