Spiral mixing and bleaching device for plant fibers

Abstract

The invention discloses a spiral mixing bleaching device for plant fiber, which comprises a conveying shell and a conveying mixing screw, the conveying shell is provided with a feed port and a discharge port, the conveying mixing screw comprises a conveying shaft, the conveying shaft is rotatably connected with the conveying shell, the conveying shaft is provided with a spiral blade and a spiral groove, and the spiral blade and the spiral groove are arranged in the conveying shell. The spiral blades and the spiral grooves are arranged on the inner side of the conveying shell and can convey materials from the feeding port to the discharging port, the spiral blades are provided with a plurality of mixing and scattering notches, the mixing and scattering notches are distributed at intervals in the extending direction of the spiral blades, and the mixing and scattering notches communicate with the spiral grooves located in the two sides. In the rotating process of the conveying and mixing screw, local turbulence can be formed at the position of the mixing and scattering notch through the arrangement of the mixing and scattering notch, materials can be scattered through the side edge of the mixing and scattering notch, contact and mixing of the materials and liquid medicine are promoted, and therefore fiber bleaching is more uniform, and the dosage of the liquid medicine is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking fiber production, and particularly relates to a spiral mixing and bleaching device for plant fibers. Background Art

[0002] In the process of papermaking pulping production, plant fibers such as wood fibers, bamboo fibers, reed fibers, etc. need to go through a bleaching process. Specifically, bleaching liquid medicines such as hydrogen peroxide and sodium hydroxide are added to the fibers. The bleaching effect of the fibers affects the whiteness and color uniformity of the paper. In the prior art, a spiral mixing structure is adopted for bleaching, that is, the fibers are added into the outer shell, and at the same time, the bleaching liquid medicine is added to the inner side of the outer shell. The fibers and the bleaching liquid medicine are pushed and mixed by the spiral inside the outer shell to achieve the bleaching of the fibers. However, in this spiral mixing method, the fibers are prone to agglomerate in the spiral groove. After the fibers agglomerate, the internal fibers are not easy to contact and mix with the liquid medicine, resulting in uneven bleaching. More liquid medicine needs to be added to improve the consistency of the bleaching effect and whiteness, resulting in a large cost of liquid medicine materials and treatment costs. Summary of the Invention

[0003] The main object of the present invention is to propose a spiral mixing and bleaching device for plant fibers, aiming to solve the technical problems of uneven mixing of the mixing structure in the prior art and large addition amount of liquid medicine.

[0004] To achieve the above object, the present invention proposes a spiral mixing and bleaching device for plant fibers, including a conveying outer shell and a conveying and mixing screw. The conveying outer shell is provided with a feed inlet and a discharge outlet. The conveying and mixing screw includes a conveying shaft, the conveying shaft is rotatably connected to the conveying outer shell, the conveying shaft is provided with spiral blades and spiral grooves. The spiral blades and the spiral grooves are arranged inside the conveying outer shell. The spiral blades and the spiral grooves can convey the material from the feed inlet to the discharge outlet. A plurality of mixing and dispersing notches are provided on the spiral blades, and the plurality of mixing and dispersing notches are arranged at intervals along the extending direction of the spiral blades. The mixing and dispersing notches communicate with the spiral grooves on both sides.

[0005] The material is added from the feed inlet of the conveying outer shell to the inside of the conveying outer shell. The conveying and mixing screw rotates, and the liquid medicine is also added to the inside of the conveying outer shell. The material is conveyed and stirred in the spiral groove towards the discharge outlet and further mixed and bleached with the liquid medicine. During the rotation of the conveying and mixing screw, the setting of the mixing and dispersing notches can form local turbulence at the positions of the mixing and dispersing notches. The side edges of the mixing and dispersing notches can disperse the material, promoting the contact and mixing of the material and the liquid medicine, so as to make the fiber bleaching more uniform and reduce the dosage of the liquid medicine.

[0006] Preferably, taking a pitch length part of the spiral blade as a mixing section, the mixing and dispersing notches on two adjacent mixing sections are circumferentially offset.

[0007] During transportation, most of the materials will be at the lower part of the conveying and mixing screw, and there will be a liquid medicine layer at the inner bottom of the conveying housing. The liquid medicine layer will soak the materials. When the conveying and mixing screw rotates one week, the material mass on the lower side of the conveying and mixing screw is also pushed forward by a pitch distance. In this solution, the mixing and dispersing notches on two adjacent mixing sections are circumferentially offset. Therefore, during the material pushing process, if a certain material mass in the liquid medicine layer just passes through the mixing and dispersing notch without being dispersed, when it is pushed forward by one or multiple pitch distances, the material mass will be dispersed by other offset mixing and dispersing notches behind. This enables the materials in the liquid medicine layer to fully contact the liquid medicine even when the depth of the liquid medicine layer on the lower side of the conveying and mixing screw is relatively shallow, improving the utilization rate of the liquid medicine, thereby reducing the amount of added liquid medicine and further reducing the dosage of the liquid medicine.

[0008] Preferably, in the extending direction of the spiral blade, the interval angle β1 between two adjacent mixing and dispersing notches is 60 - 65°, the mixing and dispersing notch is fan-shaped, and the included angle β2 between the two side edges of the mixing and dispersing notch is 25 - 35°.

[0009] Preferably, an external liquid adding port is provided on the conveying housing, and the external liquid adding port is used to add liquid medicine to the inner side of the conveying housing; And / or, an infusion channel is provided inside the conveying shaft, an infusion port communicating with the infusion channel is provided at the end of the conveying shaft, and an internal liquid adding port communicating with the infusion channel is provided on the conveying shaft. The internal liquid adding port is used to add liquid medicine to the spiral groove.

[0010] The liquid medicine is added from the external liquid adding port on the conveying housing, that is, from the radial outside of the materials, and / or from the internal liquid adding port on the conveying shaft, that is, from the radial inside of the materials, to contact and mix with the materials, which can all achieve the mixing of the liquid medicine added to the inner side of the conveying housing with the materials. When both the external liquid adding port and the internal liquid adding port are provided, liquid medicine can be added to both the radial outside and the radial inside of the materials, increasing the contact and mixing points between the materials and the liquid medicine and reducing the mixing blind area. Thereby, the mixing uniformity of the materials and the liquid medicine can be improved, and the addition amount of the liquid medicine can be reduced.

[0011] Preferably, the spiral blade is provided with a feeding section, a dispersing and adding medicine section, and a mixing section in the axial direction of the conveying shaft. The feeding section, the dispersing and adding medicine section, and the mixing section are arranged in sequence in the direction from the feeding port to the discharging port. The feeding port is directly opposite to the feeding section, both the external liquid adding port and the internal liquid adding port are opposite to the dispersing and adding medicine section, and the mixing and dispersing notch is arranged on the mixing section.

[0012] The material enters the feeding section from the feeding port and is then conveyed to the dispersion and chemical addition section; the agglomerated material is dispersed in the dispersion and chemical addition section, which can increase the contact area with the liquid medicine. The liquid medicine is added in the dispersion and chemical addition section and contacts and mixes with the dispersed material, making the mixing of the liquid medicine and the material more uniform; then the material is conveyed into the mixing section, and the material and the liquid medicine are further stirred and mixed in the mixing section, enabling the material and the liquid medicine to fully react and bleach.

[0013] Preferably, the spiral blades located in the dispersion and chemical addition section include a plurality of dispersion teeth, and the plurality of dispersion teeth are arranged at intervals along the extension direction of the spiral blades. A dispersion material passing gap is provided between two adjacent dispersion teeth.

[0014] Due to the action of the previous treatment process in the bleaching process, the material will be pressed into an agglomerated state, so most of the material will be in an agglomerated state when entering the feeding port. In this solution, by setting a plurality of dispersion teeth, the material can be dispersed, and after being dispersed, it can be mixed with the liquid medicine more evenly, enabling the material inside the agglomerate to also come into contact with the liquid medicine.

[0015] Preferably, the dispersion tooth includes a connected first plate and a second plate. Both the first plate and the second plate are connected to the conveying shaft and extend along the radial direction of the conveying shaft. The first plate and the second plate are arranged at an obtuse angle. The connecting corner position of the first plate and the second plate protrudes towards the conveying direction of the spiral blade, and both the first plate and the second plate are arranged at an angle with the tangent direction of the spiral blade at the connecting corner position of the first plate and the second plate.

[0016] When the conveying and mixing screw rotates, the corner position between the first plate and the second plate will impact and disperse the agglomerated material. Using the conical corner position can more easily disperse the material and make it spread out. After the material is dispersed, a part of the material will be pushed forward under the action of the dispersion teeth, and another part of the material will pass through the dispersion material passing gap along the first plate and the second plate to prevent the material from staying on the dispersion teeth; in addition, the first plate and the second plate are arranged at an obtuse angle, and both the first plate and the second plate are arranged at an angle with the tangent direction of the spiral blade, which can not only play a role in dispersing the material but also push most of the material forward, maintaining a high material conveying efficiency.

[0017] Preferably, the liquid inlet is connected with a rotary joint.

[0018] Preferably, atomizing nozzles are provided at the external liquid inlet and the internal liquid inlet, and the atomizing nozzles can atomize and spray out the liquid medicine. The liquid medicine is sprayed out through the atomizing nozzles, enabling the liquid medicine to be sprayed onto the material in a mist form, so that the liquid medicine and the material have a larger contact area and are mixed more evenly.

[0019] Preferably, the spiral mixing and bleaching device further includes a driving motor, the driving motor is relatively fixed to the conveying housing, and the driving motor is in transmission connection with the conveying shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic cross-sectional structure diagram of the spiral mixing and bleaching device of the present invention; Figure 2 is Figure 1 a partial enlarged view of part A in Figure 3 It is a partial structure diagram of the mixing section of the present invention; Figure 4 It is a schematic side view structure diagram in Embodiment 1 and Embodiment 3 of the present invention, where the mixing and dispersing notches on adjacent mixing sections are arranged opposite to each other; Figure 5 It is a schematic structure diagram in Embodiment 1 and Embodiment 3 of the present invention, where when the material mass advances by one pitch, the material passes through the mixing and dispersing notch without being dispersed; Figure 6 It is a schematic side view structure diagram in Embodiment 2 and Embodiment 4 of the present invention, where the mixing and dispersing notches on adjacent mixing sections are arranged in a staggered manner; Figure 7 It is a schematic structure diagram in Embodiment 2 and Embodiment 4 of the present invention, where in one mixing section, the material mass passes through the mixing and dispersing notch without being dispersed; Figure 8 It is a schematic structure diagram in Embodiment 2 and Embodiment 4 of the present invention, where when the material mass advances to the next mixing section, the material mass is dispersed by the staggered mixing and dispersing notches; Figure 9 It is a partial structure diagram of the dispersing and dosing section of the present invention; Figure 10(a) is a physical diagram of the fiber after bleaching treatment using the spiral mixing structure of the prior art, and Figure 10(b) is a physical diagram of the fiber after bleaching treatment using the spiral mixing and bleaching device of Embodiment 4 of the present invention.

[0022] In the attached drawings: 1 - conveying housing, 11 - feed inlet, 12 - discharge outlet, 13 - external liquid addition port, 21 - conveying shaft, 22 - spiral blade, 221 - feeding section, 222 - dispersing and chemical addition section, 223 - mixing section, 23 - spiral groove, 24 - liquid delivery channel, 241 - liquid delivery port, 242 - internal liquid addition port, 25 - dispersing teeth, 251 - first plate, 252 - second plate, 26 - dispersing material passing gap, 27 - mixing and dispersing notch, 3 - driving motor, 4 - material mass, 5 - liquid medicine layer.

[0023] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the attached drawings. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that if there are directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] As Figures 1 to 9 shown, a spiral mixing and bleaching device for plant fibers includes a conveying housing 1 and a conveying and mixing screw.

[0028] The conveying housing 1 is basically cylindrical and horizontally arranged. The conveying housing 1 is provided with a feed inlet 11 and a discharge outlet 12. Materials are added into the conveying housing 1 from the feed inlet 11, and the bleached materials are discharged from the discharge outlet 12.

[0029] The conveying mixing screw includes a transversely arranged conveying shaft 21, which is rotatably connected to the conveying housing 1. The conveying shaft 21 is provided with a spiral blade 22 and a spiral groove 23. The spiral blade 22 and the spiral groove 23 are arranged on the inner side of the conveying housing 1. The spiral blade 22 and the spiral groove 23 can convey the material from the feed port 11 to the discharge port 12. The spiral blade 22 is provided with a plurality of mixing and breaking notches 27. Figure 3 , a plurality of mixing and breaking notches 27 are arranged at intervals along the extension direction of the spiral blade 22, and the mixing and breaking notches 27 are connected to the spiral grooves 23 on both sides. The spiral mixing and bleaching device also includes a driving motor 3, which is relatively fixed to the conveying housing 1, and the driving motor 3 is connected to the conveying shaft 21, and the driving motor 3 can drive the conveying mixing screw to rotate.

[0030] The material is added to the inner side of the conveying shell 1 from the feed port 11 of the conveying shell 1, and the conveying mixing screw rotates, and the liquid medicine is also added to the inner side of the conveying shell 1. The material is conveyed and stirred to the discharge port 12 in the spiral groove 23 and further mixed with the liquid medicine for bleaching. During transportation, most of the material will be at the lower part of the conveying mixing screw, and there will be a liquid medicine layer 5 at the inner bottom of the conveying shell 1. The liquid medicine layer 5 will soak the material, so it is easy to agglomerate at the lower side of the conveying mixing screw, and the material inside the material mass 4 is not easy to contact the liquid medicine. More and deeper liquid medicine layers 5 and longer soaking time are required to ensure the bleaching effect. During the rotation of the conveying mixing screw, the setting of the mixing and breaking up notch 27 can form local turbulence at the position of the mixing and breaking up notch 27, and the side of the mixing and breaking up notch 27 can break up the material, promote the contact and mixing of the material and the liquid medicine, so that the fiber bleaching is more uniform and the amount of liquid medicine is reduced.

[0031] In some specific embodiments, a portion of the pitch length of the spiral blade 22 is used as a mixing section, and the mixing and breaking notches 27 on two adjacent mixing sections are circumferentially staggered. Figure 3 , Figure 6 and Figure 7 .

[0032] During transportation, most of the material will be at the bottom of the conveying mixing screw, and there will be a liquid medicine layer 5 at the bottom of the inner side of the conveying shell 1, and the liquid medicine layer 5 will soak the material. When the conveying mixing screw rotates one circle, the material mass 4 at the bottom of the conveying mixing screw is also pushed forward by a pitch. If the mixing and breaking notches 27 on the two adjacent mixing sections are arranged opposite to each other, that is, they are not misaligned, refer to Figure 4 and Figure 5 If a material mass 4 just passes through the mixing and breaking gap 27 without being broken up, when it is pushed forward by one or multiple pitch distances, the material mass 4 will pass through the mixing and breaking gap 27 without being broken up, resulting in poor bleaching effect of the material in the middle of the material mass 4 and low utilization rate of the liquid medicine.

[0033] In this solution, the mixing and dispersing notches 27 on two adjacent mixing sections are circumferentially offset. Therefore, during the material pushing process, if a certain material mass 4 in the liquid medicine layer 5 just passes through the mixing and dispersing notch 27 without being dispersed, refer to Figure 7 , when pushing forward a pitch distance or a multiple of the pitch distance, the material mass 4 will be dispersed by other offset mixing and dispersing notches 27 following it, refer to Figure 9 , so that when the depth of the liquid medicine layer 5 under the conveying and mixing screw is relatively shallow, the materials in the liquid medicine layer 5 can also fully contact the liquid medicine, improving the utilization rate of the liquid medicine, thereby reducing the amount of added liquid medicine and further reducing the dosage of the liquid medicine. Preferably, the mixing and dispersing notches 27 on multiple mixing sections are sequentially circumferentially offset.

[0034] Furthermore, refer to Figure 6 , in the extending direction of the spiral blade 22, the interval angle β1 between two adjacent mixing and dispersing notches 27 is 60 - 65°, the mixing and dispersing notch 27 is fan-shaped, and the two side edges of the mixing and dispersing notch 27 are centered on the axis of the conveying and mixing screw, and the included angle β2 between the two side edges of the mixing and dispersing notch 27 is 25 - 35°. Preferably, the interval angle β1 between two adjacent mixing and dispersing notches 27 is 62.5°, and the included angle β2 between the two side edges of the mixing and dispersing notch 27 is 30°, that is, each mixing section has about six mixing and dispersing notches 27, and the mixing and dispersing notches 27 corresponding in position in two adjacent mixing sections are staggered by 15°. At this staggering angle, the mixing effect of the materials and the liquid medicine is better.

[0035] In some specific embodiments, an external liquid adding port 13 is provided on the conveying outer shell 1, and the external liquid adding port 13 is used to add liquid medicine to the inner side of the conveying outer shell 1; and / or, an infusion channel 24 is provided inside the conveying shaft 21, an infusion port 241 communicating with the infusion channel 24 is provided at the end of the conveying shaft 21, and an internal liquid adding port 242 communicating with the infusion channel 24 is provided on the conveying shaft 21, and the internal liquid adding port 242 is used to add liquid medicine to the spiral groove 23.

[0036] The liquid medicine is added from the external liquid adding port 13 on the conveying outer shell 1, that is, from the radial outside of the material, and / or from the internal liquid adding port 242 on the conveying shaft 21, that is, from the radial inside of the material, to contact and mix with the material, and both can realize the addition of liquid medicine to the inner side of the conveying outer shell 1 to mix with the material. When the external liquid adding port 13 and the internal liquid adding port 242 are provided simultaneously, liquid medicine can be added to both the radial outside and the radial inside of the material, increasing the contact and mixing points between the material and the liquid medicine and reducing the mixing blind area, thereby improving the uniformity of the mixing of the material and the liquid medicine and reducing the addition amount of the liquid medicine.

[0037] In some specific embodiments, the spiral blade 22 is provided with a feeding section 221, a dispersing and dosing section 222, and a mixing section 223 in the axial direction of the conveying shaft 21. The feeding section 221, the dispersing and dosing section 222, and the mixing section 223 are arranged in sequence in the direction from the feeding port 11 to the discharging port 12. The feeding port 11 is directly opposite to the feeding section 221, the external liquid adding port 13 and the internal liquid adding port 242 are both opposite to the dispersing and dosing section 222, and the mixing and dispersing notch 27 is arranged on the mixing section 223.

[0038] The material enters the feeding section 221 from the feeding port 11 and is then conveyed to the dispersing and dosing section 222. The agglomerated material is dispersed in the dispersing and dosing section 222, which can increase the contact area with the liquid medicine. The liquid medicine is added in the dispersing and dosing section 222 and contacts and mixes with the dispersed material, making the mixing of the liquid medicine and the material more uniform. Then the material is conveyed into the mixing section 223, and the material and the liquid medicine are further stirred and mixed in the mixing section 223, so that the material and the liquid medicine fully react and bleach.

[0039] In some specific embodiments, referring to Figure 9 , the spiral blade 22 located in the dispersing and dosing section 222 includes a plurality of dispersing teeth 25. The plurality of dispersing teeth 25 are arranged at intervals along the extending direction of the spiral blade 22, and a dispersing and feeding gap 26 is provided between two adjacent dispersing teeth 25.

[0040] Due to the action of the pre-treatment process in the bleaching process, the material will be compressed into agglomerates, so most of the material will be in an agglomerated state when entering the feeding port 11. In this solution, by arranging a plurality of dispersing teeth 25, the material can be dispersed, and after being dispersed, it can be mixed with the liquid medicine more uniformly, enabling the material inside the agglomerates to also come into contact with the liquid medicine.

[0041] Preferably, the dispersing tooth 25 includes a first plate 251 and a second plate 252 connected to each other. Both the first plate 251 and the second plate 252 are connected to the conveying shaft 21 and extend along the radial direction of the conveying shaft 21. The first plate 251 and the second plate 252 are arranged at an obtuse angle. The connecting corner position of the first plate 251 and the second plate 252 protrudes towards the conveying direction of the spiral blade 22. Both the first plate 251 and the second plate 252 are arranged at an angle with the tangent direction of the spiral blade 22 at the connecting corner position of the first plate 251 and the second plate 252. Preferably, the angle between the first plate 251 and the second plate 252 is 110°, and the width of the dispersing and feeding gap 26 accounts for 30% of the width of the dispersing tooth 25.

[0042] When the conveying and mixing screw rotates, the angular position between the first plate 251 and the second plate 252 will impact and break up the agglomerated materials. The conical angular position can more easily break up the materials and disperse them. After the materials are dispersed, part of the materials will be pushed forward under the action of the dispersing teeth 25, and the other part of the materials will pass through the dispersing and feeding gap 26 along the first plate 251 and the second plate 252 to prevent the materials from staying on the dispersing teeth 25. In addition, the first plate 251 and the second plate 252 are arranged at an obtuse angle, and both the first plate 251 and the second plate 252 are arranged at an angle with the tangent direction of the spiral blade 22, which can not only play a role in breaking up the materials but also push most of the materials forward to maintain a high material conveying efficiency. In some other embodiments, the dispersing teeth 25 can also be in the shape of a rectangular column, a circular column, etc.

[0043] In some specific embodiments, the infusion port 241 is connected with a rotary joint. The rotary joint is connected to a pipeline, and the liquid medicine is conveyed through this pipeline, passes through the rotary joint and the infusion port 241 and enters the infusion channel 24. The setting of the rotary joint can allow the pipeline to rotate relative to the conveying and mixing screw while conveying the liquid medicine, so as to prevent the conveying and mixing screw from driving the pipeline to rotate.

[0044] In some specific embodiments, referring to Figure 2 , the external liquid addition port 13 and the internal liquid addition port 242 are provided with atomizing nozzles, and the atomizing nozzles can atomize and spray out the liquid medicine. The liquid medicine is sprayed out through the atomizing nozzles, so that the liquid medicine is sprayed onto the materials in a mist form, enabling the liquid medicine to have a larger contact area with the materials and being mixed more evenly.

[0045] The following is a comparative test on spiral mixing and bleaching devices with different structures to compare the weight of the liquid medicine required when bleaching the same weight of fibers to obtain the same whiteness and uniformity. In the following tests, the same fiber is bleached with the liquid medicine of the same composition and concentration. The composition of the liquid medicine includes hydrogen peroxide with a concentration of 13.5%, sodium hydroxide solution with a concentration of 13%, and a stabilizer. The stabilizer is a stabilizer well-known to those skilled in the art for use in fiber bleaching. The main components of the stabilizer are chelating agents and sodium silicate, which can be purchased on the market. Among them, the dosages of the sodium hydroxide solution and the stabilizer are relatively fixed. The dosage of the sodium hydroxide solution is about 461.5 kg / ton of fiber, and the dosage of the stabilizer is about 34.2 kg / ton of fiber. The bleaching effect is changed by changing the dosage of hydrogen peroxide.

[0046] Example 1: The spiral mixing and bleaching device includes a conveying housing 1 and a conveying and mixing screw. The conveying housing 1 is provided with a feed inlet 11, a discharge outlet 12, and an external liquid addition port 13. The external liquid addition port 13 is provided with an atomizing nozzle. The conveying and mixing screw includes a conveying shaft 21, and the conveying shaft 21 is provided with spiral blades 22 and spiral grooves 23, and an internal liquid addition port 242 is not provided on the conveying shaft 21. The spiral blades 22 are provided with a feed section 221, a dispersion and chemical addition section 222, and a mixing section 223. The dispersion and chemical addition section 222 includes a plurality of dispersion teeth 25 each including a first plate 251 and a second plate 252. A plurality of mixing and dispersion notches 27 are provided on the spiral blades 22 located in the mixing section 223. The mixing and dispersion notches 27 on two adjacent mixing sections are arranged opposite to each other, that is, the interval angle between two adjacent mixing and dispersion notches 27 is 60°. The mixing and dispersion notches 27 are arranged in a fan shape, and the included angle between the two side edges of the mixing and dispersion notches 27 is 30°.

[0047] Example Two: The structure of Example Two is basically the same as that of Example One, and the difference lies in that: the mixing and dispersion notches 27 on two adjacent mixing sections are arranged circumferentially in a staggered manner, and the interval angle β1 between two adjacent mixing and dispersion notches 27 is 62.5°.

[0048] Example Three: The structure of Example Three is basically the same as that of Example One, and the difference lies in that: an internal liquid addition port 242 is provided on the conveying shaft 21.

[0049] Example Four: The structure of Example Four is basically the same as that of Example Three, and the difference lies in that: the mixing and dispersion notches 27 on two adjacent mixing sections are arranged circumferentially in a staggered manner, and the interval angle β1 between two adjacent mixing and dispersion notches 27 is 62.5°.

[0050] The comparison results of the above Example One, Example Two, Example Three, and Example Four are as follows in the table: As can be seen from the above table, through the comparison between Example Two and Example One, the savings in hydrogen peroxide is about 7.1%. Using the staggered mixing and dispersion notches 27 can reduce the dosage of the liquid medicine more than using the directly opposite mixing and dispersion notches 27; through the comparison between Example Three and Example One, the savings in hydrogen peroxide is about 2.4%. Adding liquid from both the outside and the inside can reduce the dosage of the liquid medicine more; through Example Four, it can be seen that using the staggered mixing and dispersion notches 27 and adding liquid from both the outside and the inside has the best effect, and the savings in hydrogen peroxide can reach 11.9%, which can further save the dosage of the liquid medicine, reduce the bleaching treatment cost. Calculated based on an annual fiber processing volume of 300,000 tons, the market price of 13.5% - concentration hydrogen peroxide is about 286.9 yuan / ton, and it can reduce the bleaching liquid medicine cost by about 3.1846 million yuan per year.

[0051] In addition, Fig. 10(a) is a physical picture of the fiber after bleaching treatment with the spiral mixing structure of the prior art, and Fig. 10(b) is a physical picture of the fiber after bleaching treatment with the spiral mixing bleaching device of Embodiment 4 of the present invention. From the comparison of the fiber bleaching effects in Fig. 10(a) and Fig. 10(b), it can be seen that when the same amount of liquid medicine is used, the whiteness of the fiber obtained by bleaching treatment with the prior art fails to meet the requirements and the uniformity is low; while the whiteness and uniformity of the fiber obtained in Embodiment 4 of this solution are both high.

[0052] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A spiral mixing and bleaching device for plant fibers, characterized in that, It includes a conveying housing (1) and a conveying and mixing screw. The conveying housing (1) is provided with a feed inlet (11) and a discharge outlet (12). The conveying and mixing screw includes a conveying shaft (21). The conveying shaft (21) is rotatably connected to the conveying housing (1). The conveying shaft (21) is provided with spiral blades (22) and spiral grooves (23). The spiral blades (22) and the spiral grooves (23) are arranged inside the conveying housing (1). The spiral blades (22) and the spiral grooves (23) can convey materials from the feed inlet (11) to the discharge outlet (12). A plurality of mixing and dispersing notches (27) are provided on the spiral blades (22). The plurality of mixing and dispersing notches (27) are arranged at intervals along the extending direction of the spiral blades (22). The mixing and dispersing notches (27) communicate with the spiral grooves (23) located on both sides.

2. The spiral mixing and bleaching device according to claim 1, wherein, Taking a pitch length part of the spiral blades (22) as a mixing section, the mixing and dispersing notches (27) on two adjacent mixing sections are arranged with circumferential dislocation.

3. The spiral mixing and bleaching device according to claim 2, characterized in that, In the extending direction of the spiral blades (22), the interval angle β1 between two adjacent mixing and dispersing notches (27) is 60 - 65°. The mixing and dispersing notches (27) are arranged in a fan shape. The included angle β2 between the two side edges of the mixing and dispersing notches (27) is 25 - 35°.

4. The spiral mixing and bleaching device according to claim 1, wherein, The conveying housing (1) is provided with an external liquid adding port (13). The external liquid adding port (13) is used to add liquid medicine to the inside of the conveying housing (1). And / or, an infusion channel (24) is provided inside the conveying shaft (21). The end of the conveying shaft (21) is provided with an infusion port (241) communicating with the infusion channel (24). The conveying shaft (21) is provided with an internal liquid adding port (242) communicating with the infusion channel (24). The internal liquid adding port (242) is used to add liquid medicine into the spiral grooves (23).

5. The spiral mixing and bleaching device according to claim 4, characterized in that, The spiral blades (22) are provided with a feeding section (221), a dispersing and adding medicine section (222) and a mixing section (223) in the axial direction of the conveying shaft (21). The feeding section (221), the dispersing and adding medicine section (222) and the mixing section (223) are arranged in sequence in the direction from the feed inlet (11) to the discharge outlet (12). The feed inlet (11) is directly opposite to the feeding section (221). The external liquid adding port (13) and the internal liquid adding port (242) are both opposite to the dispersing and adding medicine section (222). The mixing and dispersing notches (27) are arranged on the mixing section (223).

6. The spiral mixing and bleaching device according to claim 5, characterized in that, The spiral blades (22) located in the dispersing and adding medicine section (222) include a plurality of dispersing teeth (25). The plurality of dispersing teeth (25) are arranged at intervals along the extending direction of the spiral blades (22). A dispersing and feeding gap (26) is provided between two adjacent dispersing teeth (25).

7. The spiral mixing and bleaching device according to claim 6, wherein The dispersing teeth (25) include a first plate (251) and a second plate (252) connected to each other. Both the first plate (251) and the second plate (252) are connected to the conveying shaft (21) and extend along the radial direction of the conveying shaft (21). The first plate (251) and the second plate (252) are arranged at an obtuse angle. The connecting corner position of the first plate (251) and the second plate (252) protrudes towards the conveying direction of the spiral blade (22). Both the first plate (251) and the second plate (252) are arranged at an angle with the tangent direction of the spiral blade (22) at the connecting corner position of the first plate (251) and the second plate (252).

8. The spiral mixing and bleaching device according to claim 4, characterized in that, The infusion port (241) is connected with a rotary joint.

9. The spiral mixing and bleaching device according to claim 4, wherein, The external liquid addition port (13) and the internal liquid addition port (242) are provided with atomizing nozzles, and the atomizing nozzles can atomize and spray the liquid medicine.

10. The spiral mixing and bleaching device according to claim 1, wherein, The spiral mixing and bleaching device further includes a driving motor (3). The driving motor (3) is relatively fixed to the conveying housing (1), and the driving motor (3) is in transmission connection with the conveying shaft (21).

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