Screening apparatus and screening method in bamboo pulping

Abstract

A screening device and a screening method for bamboo pulping. The screening device is applied before the high consistency grinding process in the pulping process, and comprises a feeding device, a conveying wheel, a receiving wheel and a discharging device. The feeding device is used for conveying materials. The outer periphery of the conveying wheel is provided with a plurality of first teeth and first gaps arranged alternately. The outer periphery of the receiving wheel is provided with a plurality of second teeth and second gaps arranged alternately. In the area between the conveying wheel and the receiving wheel, the first teeth of the conveying wheel are embedded into the second gaps of the receiving wheel, and the second teeth are embedded into the first gaps, so that the conveying wheel and the receiving wheel are embedded into each other, and a gap is reserved between the first teeth and the second teeth to enable the fines to pass through. The fiber filaments flow on the conveying wheel and are combed up by the second teeth of the receiving wheel to flow to the receiving wheel. The discharging device conveys the materials to the next processing procedure.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of papermaking, in particular to a screening device and a screening method in bamboo pulping. BACKGROUND

[0002] In the bamboo pulping papermaking industry, after the bamboo is subjected to the steam explosion process, the bamboo chips need to be further processed by a wire rubbing machine or other devices, but at this time, some fragments and powders (mainly composed of fine fibers, lignin powders, bamboo spring fragments, etc.) will be generated, and these fragments and powders have a negative impact on the subsequent pulping papermaking quality, and therefore need to be removed and separated. SUMMARY

[0003] In order to solve the problem of fragments and powders affecting the quality of pulping papermaking in the related art, the present disclosure provides a screening device and a screening method capable of separating fragments and powders.

[0004] The present disclosure provides a screening device in bamboo pulping, which is applied before the high consistency refining process in the pulping process, and comprises:

[0005] A feeding device for conveying materials, the materials comprising fiber filaments and fragments;

[0006] A conveying wheel, an outer circumferential surface of the conveying wheel being provided with a plurality of first teeth and first gaps arranged alternately, the first teeth and the first gaps being arranged in a comb shape;

[0007] A receiving wheel, an outer circumferential surface of the receiving wheel being provided with a plurality of second teeth and second gaps arranged alternately, the second teeth and the second gaps being arranged in a comb shape; wherein, in the region between the conveying wheel and the receiving wheel, the first teeth of the conveying wheel are embedded into the second gaps of the receiving wheel, and the second teeth are embedded into the first gaps, so that the conveying wheel and the receiving wheel are embedded into each other, and a gap capable of allowing the fragments to pass through is reserved between the first teeth and the second teeth, in the rotation process of the conveying wheel and the receiving wheel, the fragments fall into the powder collecting groove below through the gap, the fiber filaments flow on the conveying wheel and are combed up by the second teeth on the receiving wheel to flow to the receiving wheel;

[0008] A discharging device arranged below the receiving wheel, the receiving wheel conveying the fiber filaments to the discharging device, and the discharging device conveying the materials to the next processing procedure.

[0009] Optionally, a baffle plate is provided on the side of the receiving wheel away from the conveying wheel. The baffle plate is located in the gap between the receiving wheel and the discharging device to block the fiber filaments conveyed by the receiving wheel, so that the fiber filaments fall onto the discharging device and do not rotate with the receiving wheel.

[0010] Optionally, the baffle plate is a baffle fork, and the baffle bar prevents the fiber filament from continuing to rotate and transfers the fiber filament on the receiving wheel to the discharge device baffle bar.

[0011] Optionally, the stop fork is arranged vertically or at an angle relative to the receiving wheel, with the angle of inclination towards the central axis of the receiving wheel. The angle of inclination is less than or equal to 90 degrees, so that when the receiving wheel rotates, the stop fork combs the fiber filaments toward the discharge device.

[0012] Optionally, it also includes a feeding wheel disposed at the lower end of the feed fork, wherein feeding wheel teeth are provided on the outer circumferential surface of the feeding wheel, and the feeding wheel teeth stop strips pull out the fiber filaments on the feed fork during the rotation of the feeding wheel.

[0013] Optionally, at least one of the first tooth of the conveying wheel and the second tooth of the receiving wheel is provided with a cutting edge.

[0014] Optionally, the feeding device includes a feeding conveyor belt and a feeding wheel that drives the feeding conveyor belt to move. A transition tooth is provided in the gap between the feeding wheel and the conveying wheel. The transition tooth is used to prevent the fiber from leaking out of the gap. The protruding teeth of the transition tooth engage with the first gap of the conveying wheel. During the rotation of the conveying wheel, the fiber on the transition tooth is transferred to the receiving wheel.

[0015] Optionally, a heating and dehumidification system is also included, which is located on the path of the feed conveyor belt to remove moisture from the material and keep the powder dry.

[0016] Optionally, the conveyor wheel and the receiving wheel are connected by a chain for transmission, and are driven to rotate by the same motor.

[0017] This disclosure also provides a screening method for bamboo pulping, applied before the high-consistency milling process in the pulping process, including:

[0018] The material, including fibers and fragments, is conveyed to the conveyor wheel via a feeding device.

[0019] The fiber filaments are combed up by the conveyor wheel and transferred to the receiving wheel. During the rotation of the conveyor wheel, the powder falls into the powder collection trough through the gap between the first tooth of the conveyor wheel and the second tooth of the receiving wheel. The powder collection trough is located below the conveyor wheel and the receiving wheel. The first tooth of the conveyor wheel engages with the second tooth of the receiving wheel, and the second tooth of the receiving wheel engages with the first tooth of the conveyor wheel.

[0020] The fiber filaments are combed up by the receiving wheel and transferred to the discharge device.

[0021] Optionally, the material is obtained by steam-exploding bamboo and then hammering or extruding it using a hammering machine or a twisting machine.

[0022] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0023] This disclosure provides a screening device for bamboo pulping. The screening device is installed after a high-consistency mill. The material after being treated by steam explosion, shredding, or hammering flows through a conveyor wheel and a receiving wheel. The teeth and gaps of the conveyor wheel and the receiving wheel are interlocked with each other, and an appropriate gap is reserved between them to allow fragments, such as fine fibers, lignin powder, bamboo fragments, dust, and fine sand, to fall through, while the fiber filaments are transferred from the conveyor wheel to the receiving wheel through the teeth. In this way, the fragments and powders are separated from the fiber filaments, thereby removing fragments and powders that have a negative impact on paper and improving the quality of the pulp.

[0024] This disclosure also provides a screening method for bamboo pulping, applied before the high-consistency milling process in the pulping process, comprising:

[0025] Material, including fibers and fragments, is conveyed to a conveyor wheel via a feeding device. The conveyor wheel combs up the fibers and transfers them to a receiving wheel. During the rotation of the conveyor wheel, the fragments fall into a powder collection trough through the gap between the first tooth of the conveyor wheel and the second tooth of the receiving wheel. The powder collection trough is located below the conveyor wheel and the receiving wheel, wherein the first tooth of the conveyor wheel engages with the second tooth of the receiving wheel, and the second tooth of the receiving wheel engages with the first tooth of the conveyor wheel. The receiving wheel combs up the fibers and transfers them to a discharge device. This screening method utilizes comb-shaped conveyor and receiving wheels to achieve the flow of fibers. The gap between the teeth of the conveyor and receiving wheels allows fragments, such as fine fibers, lignin powder, bamboo fragments, dust, and fine sand, to fall through, thus separating the fragments from the fibers. This removes fragments that negatively affect paper production and improves pulp quality.

[0026] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0028] Figure 1 This is a schematic diagram of a screening device in bamboo pulping according to an exemplary embodiment.

[0029] Figure 2 This is a top view schematic diagram of a screening device in bamboo pulping according to an exemplary embodiment.

[0030] Figure 3 This is a schematic diagram of the structure of a screening device in bamboo pulping according to another exemplary embodiment.

[0031] Figure 4 This is a schematic flowchart illustrating a screening method in bamboo pulping according to an exemplary embodiment. Detailed Implementation

[0032] To further illustrate the principles and structure of this disclosure, preferred embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0033] Generally, bamboo pulping typically involves processes such as steam explosion, filament rolling or hammering, high-consistency milling, low-consistency milling, and filter pressing. After steam explosion, bamboo fibers are separated (along with hemicellulose and lignin). Following filament rolling or hammering, fine fibers, lignin powder, and bamboo fragments are further formed. The screening equipment provided by this invention can be placed after the filament rolling or hammering process to remove fragments that negatively impact paper quality, such as fine fibers, lignin powder, bamboo fragments, dust, and fine sand. These negative impacts include affecting paper strength and color. Furthermore, it is understood that if there is no filament rolling or hammering process in the pulping process, it can also be placed after the steam explosion process. Placing the screening equipment after the filament rolling or hammering process is primarily to more thoroughly remove these fragments and powders.

[0034] like Figure 1As shown, the screening device 100 in bamboo pulping of the present invention includes a feeding device 11, a conveying wheel 12, a receiving wheel 13, and a discharging device 14. The material is conveyed to the conveying wheel 12 through the feeding device 11. The conveying wheel 12 combs up the fibers in the material and transfers them to the receiving wheel 13. The fragments and powders in the material fall into the powder collection tank 19 through the gap between the conveying wheel 12 and the receiving wheel 13. The receiving wheel 13 receives the fibers from the conveying wheel 12 and transfers the fibers to the discharging device 14. In this way, the fragments and powders and the fibers are separated.

[0035] Specifically, the feeding device 11 includes a feeding conveyor belt 111 and a feeding wheel 112 that drives the feeding conveyor belt 111 to move.

[0036] As mentioned earlier, after the steam explosion process, the cellulose, hemicellulose, and lignin in the bamboo are separated, resulting in some fiber filaments. The material after steam explosion enters a hammer mill or filament rolling mill for hammering or extrusion into filaments, while also producing more fine fibers, lignin powder, bamboo leaf fragments, and other fragmented powders. Therefore, the material entering the feeding device 11 includes not only fiber filaments, an important component of papermaking, but also fine fibers, lignin powder, bamboo leaf fragments, and other fragmented powders that affect paper quality.

[0037] Driven by the feed wheel 112, the feed conveyor belt 111 conveys the material towards the conveyor wheel 12.

[0038] Combination Figure 2 As shown, the outer circumferential surface of the transmission wheel 12 is provided with a plurality of alternating first gear teeth 121 and first gaps 122, which are arranged in a comb shape.

[0039] Similarly, the outer circumferential surface of the receiving wheel 13 is provided with a plurality of alternately arranged second gear teeth 131 and second gaps 132, which are arranged in a comb shape.

[0040] In the area between the conveyor wheel 12 and the receiving wheel 13, the conveyor wheel 12 and the receiving wheel 13 are interlocked with each other. That is, the first tooth 121 of the conveyor wheel 12 is embedded in the second gap 132 of the receiving wheel 13, and the second tooth 131 is embedded in the first gap 122. Since both the first tooth 121 and the second tooth 131 extend along the radial direction of their respective wheels, the first tooth 121 and the second tooth 131 are interlocked with each other in the horizontal direction. In this way, during the rotation of the receiving wheel 13, the receiving wheel 13 can comb up the fibers flowing on the conveyor wheel 12 and transfer the fibers from the conveyor wheel 12 to the receiving wheel 13.

[0041] A gap 125 is provided between the first gear 121 and the second gear 131 to allow fine fibers, lignin powder, bamboo fragments, dust, and fine gravel to pass through. During the rotation of the conveyor wheel 12 and the receiving wheel 13, the fragments fall through the gap 125 into the powder collection tank 19.

[0042] Thus, by interlocking the teeth of the conveying wheel 12 and the receiving wheel 13 with a gap 125 between them, the fragments and powder in the material fall off, while the fibers do not, achieving separation of fragments and powder from fibers. Furthermore, since the conveying wheel 12 and the receiving wheel 13 are rotating, it is more conducive to the fragments and powder being shaken off the conveying wheel 12.

[0043] In one embodiment, the conveyor wheel 12 and the receiving wheel 13 are connected by a chain for transmission, so that the same motor can drive the conveyor wheel 12 and the receiving wheel 13 to rotate.

[0044] The powder collection trough 19 is located below the conveyor wheel 12 and the receiving wheel 13, and its opening size can cover the conveyor wheel 12 and the receiving wheel 13. In this way, the gap between the conveyor wheel 12 and the feeding device 11, and the gap between the receiving wheel 13 and the discharging device 14 are all within the range of the powder collection trough 19, ensuring that the fragments and powders can fall into the powder collection trough 19 during the entire conveying process.

[0045] There is a certain gap between the feed roller 112 and the conveyor roller 12. To prevent qualified fibers from falling into the powder collection tank 19, transition teeth 16 are provided in the gap between the feed roller 112 and the conveyor roller 12. These transition teeth 16 are used to prevent fibers from leaking through the gap, thus avoiding excessive fiber leakage. Specifically, as... Figure 2 As shown, the transition tooth 16 includes multiple protruding teeth 161 and gaps 162, which are arranged alternately. The protruding teeth 161 of the transition tooth 16 engage with the first gap 122 of the conveyor wheel 12, and the gaps 162 of the transition tooth 16 engage with the first gear teeth 121 of the conveyor wheel 12. When the conveyor wheel 12 rotates, the fibers falling on the transition tooth 16 are combed up and transferred to the receiving wheel 13. The engagement of the protruding teeth 161 of the transition tooth 16 and the first gap 122 of the conveyor wheel 12 is located in the same plane, that is, the protruding teeth 161 are horizontally embedded in the first gap 122. Similarly, the first gear teeth 122 are also horizontally embedded in the gaps 162.

[0046] The transition tooth 16 extends from the bottom of the conveyor wheel 12 to the horizontal line L1 on the central axis of the conveyor wheel 12. This allows the transition tooth 16 to fully engage with the conveyor wheel 12, facilitating the conveyor wheel 12 to carry away more fibers from the transition tooth 16. The length of the protruding teeth 161 of the transition tooth 16 is slightly shorter than the gap width between the feed wheel 112 and the conveyor wheel 12. This prevents fibers from falling off, while allowing fragmented powder to fall from the gap between the feed wheel 112 and the conveyor wheel 12 into the powder collection tank 19.

[0047] A baffle plate 15 is provided on the side of the receiving wheel 13 away from the conveying wheel 12. The baffle plate 15 is located in the gap formed between the receiving wheel 13 and the discharge device 14. It is used to block the fiber filaments transported by the receiving wheel 13, so that the fiber filaments fall onto the discharge device 14 and do not rotate with the receiving wheel 13. This allows most of the blocked material to fall directly from the baffle plate and separate by gravity.

[0048] In one embodiment, the baffle plate 15 is a comb-shaped baffle fork, which includes a plurality of baffles 151. The baffles 151 prevent the fiber filaments from continuing to rotate with the receiving wheel 13 and continuously transfer the fiber filaments on the receiving wheel 13 to the discharge device 14.

[0049] like Figure 1 As shown, the stop fork is set vertically relative to the receiving wheel 13, or inclined to the receiving wheel 13, with the inclination direction facing the central axis of the receiving wheel 13. The inclination angle α is less than or equal to 90 degrees. The stop bar allows the stop fork to move the fiber filaments toward the discharge device 14 when the receiving wheel 13 rotates.

[0050] Continue reading Figure 2 The stop fork extends from the bottom of the receiving roller 13 to the horizontal line L2 where the central axis of the receiving roller 13 is located. In this way, the stop fork can fully cooperate with the receiving roller 13, facilitating the removal of more fiber filaments from the receiving roller 13. Figure 3 As shown, in one embodiment, the screening equipment further includes a material-pushing wheel 18 disposed at the lower end of the stop fork. The outer circumferential surface of the material-pushing wheel 18 is provided with material-pushing wheel teeth. During the rotation of the material-pushing wheel 18, the baffle bar pulls out the fiber filaments on the stop fork and transfers them to the discharge device 14. In this way, the material retained on the stop fork is removed, ensuring smooth material flow.

[0051] The way the feed wheel 18 is coupled with the stop fork is similar to the way the stop fork is coupled with the receiving wheel 13, and will not be described in detail here.

[0052] In some cases, the fibers may become tangled. To facilitate the flow of fibers between different components, at least one of the first teeth 121 of the conveyor wheel 12 and the second teeth 132 of the receiving wheel is provided with a cutting edge to cut off the fibers. For example, the top of each first tooth 121 of the conveyor wheel 12 is provided with a cutting edge to cut off the fibers tangled between the conveyor wheel 12 and the receiving wheel 13, preventing the conveyor wheel 12 from jamming. The top of each second tooth 132 of the receiving wheel is provided with a cutting edge to cut off the fibers tangled between the receiving wheel 13 and the stop fork, preventing the receiving wheel from jamming. The discharge device 14 is located below the receiving wheel 13 and includes a discharge conveyor belt 141 and a discharge conveyor wheel 142 that drives the discharge conveyor belt 141. The discharge device 14 transports the separated fibers to the next process, such as a high-concentration milling process.

[0053] In one embodiment, the screening equipment 100 may also be equipped with a heating and dehumidification system 17, which is located on the path of the feed conveyor belt 111 to remove moisture from the material, keeping the powder dry and preventing it from sticking to the fibers. Optionally, the heating and dehumidification system 17 may also perform humidity regulation, processing and maintaining a constant humidity level of the incoming material, which is beneficial for the screening equipment to function fully and maintain quality stability.

[0054] As mentioned above, the screening equipment provided by this invention is set after the high-consistency mill. The material flows through the conveyor wheel 12 and the receiving wheel 13. The teeth and gaps of the conveyor wheel 12 and the receiving wheel 13 are interlocked with each other, and an appropriate gap is reserved between the interlocking parts to allow fragments such as fine fibers, lignin powder, bamboo fragments, powder and fine gravel to fall through, while the fiber filaments are transferred from the conveyor wheel to the receiving wheel through the wheel teeth. In this way, the fragments and powders are separated from the fiber filaments, thereby removing fragments and powders that have a negative impact on paper, improving the quality of the pulp, and making the paper produced from it have better performance in terms of flexibility, strength, color and bursting strength.

[0055] This invention also provides a screening method for bamboo pulping, applied before the high-consistency milling process in the pulping process. This screening method can use the screening equipment described in the foregoing embodiments to reduce the proportion of fine fibers in the fibers and improve the overall fiber length and quality. Specifically, as shown... Figure 4 As shown, the method includes:

[0056] Step S1: The material, including fibers and fragments, is conveyed to the conveyor wheel 12 by the feeding device 11.

[0057] Step S2: The fiber filaments are combed up by the conveyor wheel 12 and transferred to the receiving wheel 13. During the rotation of the conveyor wheel 12, the powder falls into the powder collection trough 19 through the gap between the first tooth 121 of the conveyor wheel 12 and the second tooth 131 of the receiving wheel 13. The powder collection trough 19 is located below the conveyor wheel 12 and the receiving wheel 13. The first tooth 121 of the conveyor wheel 12 engages with the second gap 132 of the receiving wheel 13, and the second tooth 131 of the receiving wheel 13 engages with the first gap 122 of the conveyor wheel 12.

[0058] Step S3: The fiber filaments are combed up by the receiving wheel 13 and transferred to the discharge device 14.

[0059] Before step S1, there is also a steam explosion process and a shredding or hammering process. The material in step S1 is obtained by steam explosion of bamboo followed by shredding or hammering. That is, the screening process is located after the shredding or hammering process.

[0060] In step S1, the feeding device 11 drives the feeding conveyor belt 111 to move through the feeding wheel 112, so that the material flows to the conveyor wheel 12.

[0061] In step S2, the conveyor wheel 12 combs up the fiber filaments and receives them by the receiving wheel 13, while the fine fibers, lignin powder, bamboo fragments, dust, fine gravel and other fragments fall into the powder collection tank 19 through the gap between the conveyor wheel 12 and the receiving wheel 13, thus separating the fragments from the fiber filaments.

[0062] In addition, a transition tooth 16 is provided in the gap between the feed wheel 112 and the conveyor wheel 12 of the feeding device 11. The transition tooth 16 blocks the fiber from falling from the gap between the feed wheel 112 and the conveyor wheel 12, and the fiber on the transition tooth 16 is transferred to the conveyor wheel 12 through the mutual cooperation between the transition tooth 16 and the conveyor wheel 12.

[0063] In step S3, a baffle plate 15 is provided in the gap between the discharge conveyor wheel 142 and the receiving wheel 13 of the discharge device 14. The baffle plate 15 blocks the fiber filaments transported by the receiving wheel 13 and continuously combs the fiber filaments onto the discharge device 14.

[0064] After step S3, the discharge device 14 transports the separated fiber filaments to the next process, such as the high concentration milling process, via the discharge conveyor belt 141.

[0065] The above are merely preferred embodiments of this disclosure and are not intended to limit the scope of protection of this disclosure. All equivalent structural changes made based on the description and drawings of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A screening device for bamboo pulping, characterized in that, Prior to the high-consistency milling process in pulping, including: A feeding device for conveying materials, including fibers and fragments; The conveyor wheel has a plurality of alternating first teeth and first gaps on its outer peripheral surface, the first teeth and first gaps being arranged in a comb shape; The receiving wheel has multiple alternating second teeth and second gaps on its outer circumferential surface, arranged in a comb-like pattern. In the area between the conveying wheel and the receiving wheel, the first teeth of the conveying wheel are embedded in the second gaps of the receiving wheel, and the second teeth are embedded in the first gaps, allowing the conveying wheel and the receiving wheel to interlock. A gap is left between the first and second teeth to allow the powder to pass through. The conveying wheel and the receiving wheel rotate in the same direction. The material is conveyed to the conveying wheel via the feeding device. The conveying wheel combs up the fibers in the material and transfers them to the receiving wheel. During the rotation of the conveying wheel and the receiving wheel, the powder falls through the gap into the powder collection trough below. The fibers flow on the conveying wheel and are combed up by the second teeth on the receiving wheel and transferred to the receiving wheel. A discharge device is located below the receiving wheel. The receiving wheel transfers the fiber filaments to the discharge device, which then conveys the material to the next processing step.

2. The screening equipment according to claim 1, characterized in that, A baffle plate is provided on the side of the receiving wheel away from the conveying wheel. The baffle plate is located in the gap between the receiving wheel and the discharging device and is used to stop the fiber filaments transported by the receiving wheel, so that the fiber filaments fall onto the discharging device and do not rotate with the receiving wheel.

3. The screening equipment according to claim 2, characterized in that, The baffle plate is a baffle fork, which includes multiple baffles. The baffles prevent the fiber from rotating further and transfer the fiber on the receiving wheel to the discharge device.

4. The screening equipment according to claim 3, characterized in that, The stop fork is set vertically or at an angle relative to the receiving wheel, with the angle of inclination towards the central axis of the receiving wheel. The angle of inclination is less than or equal to 90 degrees, so that when the receiving wheel rotates, the stop fork combs the fiber filaments toward the discharge device.

5. The screening equipment according to claim 3, characterized in that, It also includes a feeding wheel disposed at the lower end of the feed fork, the feeding wheel having feeding wheel teeth on its outer circumferential surface, the feeding wheel teeth strips pulling out the fiber filaments on the feed fork during the rotation of the feeding wheel.

6. The screening equipment according to claim 3, characterized in that, At least one of the first tooth of the conveying wheel and the second tooth of the receiving wheel is provided with a cutting edge.

7. The screening equipment according to claim 1, characterized in that, The feeding device includes a feeding conveyor belt and a feeding wheel that drives the feeding conveyor belt to move. A transition tooth is provided in the gap between the feeding wheel and the conveying wheel. The transition tooth is used to prevent the fiber from leaking out of the gap. The protruding teeth of the transition tooth engage with the first gap of the conveying wheel. During the rotation of the conveying wheel, the fiber on the transition tooth is transferred to the receiving wheel.

8. The screening equipment according to claim 7, characterized in that, It also includes a heating and dehumidification system, which is located on the path of the feed conveyor belt to remove moisture from the material and keep the powder dry.

9. The screening equipment according to claim 1, characterized in that, The conveyor wheel and the receiving wheel are connected by a chain and are driven to rotate by the same motor.

10. A screening method in bamboo pulping, characterized in that, Prior to the high-consistency milling process in pulping, including: The material, including fibers and fragments, is conveyed to the conveyor wheel via a feeding device. The fiber filaments are combed up and transferred to the receiving wheel by the conveyor wheel, which rotates in the same direction as the receiving wheel. During the rotation of the conveyor wheel, the powder falls into the powder collection trough through the gap between the first tooth of the conveyor wheel and the second tooth of the receiving wheel. The powder collection trough is located below the conveyor wheel and the receiving wheel, wherein the first tooth of the conveyor wheel engages with the second tooth of the receiving wheel, and the second tooth of the receiving wheel engages with the first tooth of the conveyor wheel. The fiber filaments are combed up by the receiving wheel and transferred to the discharge device.

11. The screening method in bamboo pulping according to claim 10, characterized in that, The material is obtained by steam-exploding bamboo and then hammering or extruding it through a hammering or twisting machine.

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