Pretreatment equipment for papermaking starch

Abstract

The utility model relates to the technical field of papermaking starch pretreatment equipment, and particularly discloses papermaking starch pretreatment equipment which comprises a pretreatment cavity, the pretreatment cavity is of a cylindrical structure, a feeding port is formed in the top of the left end of the pretreatment cavity, and a discharging port is formed in the bottom of the right end of the pretreatment cavity. The mixing mechanism comprises a rotating shaft rotationally connected to the top end in the pretreatment cavity, and through the combination of spiral material guiding and sawtooth through hole stirring blades, the mixing uniformity of starch and an additive is remarkably improved, and sufficient reaction is ensured; the segmented heating system is combined with a steam jacket and an electric heating block, so that accurate temperature control is realized, and local overheating or incomplete reaction is avoided; the intelligent sensor and the automatic control module adjust parameters in real time, manual intervention is reduced, and the process stability is improved; the whole design considers high-efficiency production and environmental protection requirements, is suitable for diversified starch pretreatment processes, and remarkably improves paper quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of papermaking starch pretreatment equipment, and specifically discloses a pretreatment equipment for papermaking starch. Background Technology

[0002] In papermaking, the main purpose of starch pretreatment is to improve the performance and stability of paper. Starch pretreatment typically includes the following steps: Starch gelatinization: The starch emulsion is heated and stirred, hot water is added, and the mixture is kept at this temperature for 1–2 hours. The stirring speed should ideally be 40 revolutions per minute, and the concentration should be controlled at 7–8%. Enzymatic hydrolysis: Amylase is added at a temperature of 55℃–65℃ and a pH of 5.0–6.5, and enzymatic hydrolysis is carried out for 2–6 hours. Then, the pH of the enzymatically hydrolyzed starch emulsion is adjusted to 9.0–11.0, and the mixture is stirred and soaked for 0.5–2 hours.

[0003] These pretreatment methods and applications not only improve the quality and stability of paper, but also optimize the production process and reduce production costs.

[0004] However, traditional pretreatment equipment has the following problems:

[0005] Uneven mixing: The single stirring device leads to insufficient contact between starch and additives, affecting reaction efficiency;

[0006] Low temperature control accuracy: The heating method is singular, making it difficult to achieve segmented temperature control, which can easily lead to local overheating or incomplete reaction.

[0007] Insufficient automation: Relying on manual parameter adjustment makes it difficult to monitor key indicators such as pH and humidity in real time. Utility Model Content

[0008] This utility model proposes a pretreatment device for starch in papermaking. By combining a spiral guide and a serrated through-hole stirring blade, the uniformity of mixing starch and additives is significantly improved. The segmented heating system, combined with a steam jacket and an electric heating block, achieves precise temperature control and avoids local overheating or incomplete reaction.

[0009] This utility model is implemented as follows: a pretreatment device for papermaking starch, comprising:

[0010] The pretreatment chamber is a cylindrical structure, with an inlet at the top left end and an outlet at the bottom right end.

[0011] The mixing mechanism includes a rotating shaft rotatably connected to the top of the pretreatment chamber, and a plurality of evenly distributed stirring blades are fixedly connected to the outer wall of the rotating shaft. A spiral guide cylinder is installed on the left side of the top of the pretreatment chamber.

[0012] The segmented heating assembly includes a steam heating section and an electric heating section. The steam heating section is a steam jacket fixedly connected to the outer wall of the pretreatment chamber. The outer wall of the steam jacket is connected to a steam inlet. A pressure relief valve is provided at the top of the steam jacket. The electric heating section consists of multiple electric heating blocks located at the bottom of the pretreatment chamber.

[0013] The liquid adding mechanism includes an atomizing nozzle assembly disposed on the top right side of the pretreatment chamber, a liquid storage tank on the top right side of the pretreatment chamber, a liquid guide pipe, and a metering pump. The atomizing nozzle assembly is connected to the liquid storage tank through the liquid guide pipe.

[0014] As a preferred embodiment of the pretreatment equipment for papermaking starch according to this utility model, a first motor is installed on the left side of the outer wall of the pretreatment cavity, and a second motor is installed at the top of the pretreatment cavity. The output end of the first motor is fixedly connected to the spiral auger shaft inside the spiral guide cylinder, and the output end of the second motor is fixedly connected to the rotating shaft.

[0015] As a preferred embodiment of the pretreatment equipment for papermaking starch according to this utility model, a temperature and humidity sensor and a pH probe are respectively provided on the upper and lower sides of the inner wall of the pretreatment chamber, and a control panel is provided on the front end face of the outer wall of the pretreatment chamber. The temperature and humidity sensor, pH probe, metering pump, electric heating block, first motor and second motor are all electrically connected to the control panel.

[0016] As a preferred embodiment of the pretreatment equipment for papermaking starch according to this utility model, the outer wall of the stirring blade is provided with a plurality of evenly distributed through holes, and the upper end face of the stirring blade is provided with a serrated structure.

[0017] As a preferred embodiment of the pretreatment equipment for papermaking starch according to this utility model, the storage tank is provided in two parts, namely an acid-base tank and an enzyme preparation tank.

[0018] As a preferred embodiment of the pretreatment equipment for papermaking starch according to this utility model, the steam jacket includes a metal layer, and the interior of the metal layer is provided with a heat insulation layer and a heat preservation layer.

[0019] As a preferred embodiment of the pretreatment equipment for papermaking starch according to this utility model, the atomizing nozzle group includes four stainless steel nozzles with a nozzle spacing of 150mm and a nozzle diameter of 0.5mm.

[0020] The beneficial effects of this utility model are:

[0021] This invention significantly improves the mixing uniformity of starch and additives by combining a spiral guide with a serrated through-hole stirring blade, ensuring a complete reaction. A segmented heating system, combined with a steam jacket and electric heating blocks, achieves precise temperature control, preventing localized overheating or incomplete reactions. Intelligent sensors and an automated control module adjust parameters in real time, reducing manual intervention and improving process stability. The equipment employs a multi-layered heat insulation structure and corrosion-resistant materials, extending its service life and ensuring operational safety. The overall design balances high-efficiency production with environmental protection requirements, making it suitable for diverse starch pretreatment processes and significantly improving paper quality and production efficiency. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the steam jacket wall of this utility model;

[0025] Figure 3 This is a diagram of the overall external structure of this utility model.

[0026] The markings in the diagram are as follows: 1. Pretreatment chamber; 2. Inlet; 3. Outlet; 4. Rotary shaft; 5. Stirring blade; 6. Spiral guide cylinder; 7. Steam jacket; 8. Steam inlet; 9. Pressure relief valve; 10. Electric heating block; 11. Atomizing nozzle assembly; 12. Storage tank; 13. Liquid guide pipe; 14. Metering pump; 15. Temperature and humidity sensor; 16. pH probe; 17. First motor; 18. Second motor; 19. Through hole; 20. Serrated structure; 21. Control panel; 22. Metal layer; 23. Insulation layer; 24. Thermal insulation layer. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0028] Please see Figure 1-3 A pretreatment device for papermaking starch, comprising:

[0029] The pretreatment chamber 1 is a cylindrical structure. The top left end of the pretreatment chamber 1 is provided with a feed inlet 2, and the bottom right end is provided with a discharge outlet 3.

[0030] The mixing mechanism includes a rotating shaft 4 rotatably connected to the top of the pretreatment chamber 1. Multiple uniformly distributed stirring blades 5 are fixedly connected to the outer wall of the rotating shaft 4. A spiral guide cylinder 6 is installed on the left side of the top of the pretreatment chamber 1.

[0031] The segmented heating assembly includes a steam heating section and an electric heating section. The steam heating section is a steam jacket 7 fixedly connected to the outer wall of the pretreatment chamber 1. The outer wall of the steam jacket 7 is connected to a steam inlet 8. A pressure relief valve 9 is provided on the top of the steam jacket 7. The electric heating section consists of multiple electric heating blocks 10 located at the bottom of the pretreatment chamber 1.

[0032] The liquid adding mechanism includes an atomizing nozzle assembly 11 located on the top right side inside the pretreatment chamber 1, a liquid storage tank 12 located on the top right side of the pretreatment chamber 1, a liquid guide pipe 13, and a metering pump 14. The atomizing nozzle assembly 11 is connected to the liquid storage tank 12 through the liquid guide pipe 13.

[0033] In this embodiment: the starch raw material enters the pretreatment chamber 1 from the feed inlet 2. The left spiral guide cylinder 6 rotates under the drive of the first motor 17, conveying the starch to the middle of the pretreatment chamber 1 and initially dispersing it. The spiral auger shaft of the spiral guide cylinder 6 reduces starch accumulation through mechanical propulsion, forming a continuous feed flow.

[0034] The rotating shaft 4 drives the stirring blade 5 to rotate at high speed under the drive of the second motor 18. The serrated structure 20 and through holes 19 on the surface of the blade enhance the shearing force, break up the agglomeration of starch particles, increase the contact area between starch and additives, and improve the mixing effect.

[0035] The atomizing nozzle group 11 of the liquid addition mechanism atomizes and sprays the acid, alkali or enzyme preparation in the storage tank 12 into the cavity, so that it comes into uniform contact with the starch and promotes the gelatinization or enzymatic hydrolysis reaction.

[0036] Steam rapidly heats the pretreatment chamber 1 through the steam jacket 7, the pressure relief valve 9 ensures stable pressure, and the electric heating block 10 at the bottom heats the bottom of the pretreatment chamber 1. This dual heating improves the heating effect and efficiency, and effectively enhances the temperature control accuracy.

[0037] Temperature and humidity sensor 15 monitors the temperature and humidity inside pretreatment chamber 1 in real time, pH probe 16 detects the acidity and alkalinity of reaction liquid, and control panel 21 automatically adjusts the speed of first motor 17 and second motor 18, power of electric heating block 10 and liquid addition amount of metering pump 14 according to sensor data to ensure precise and controllable reaction conditions.

[0038] The processed starch slurry is discharged from outlet 3.

[0039] As a technical optimization of this utility model, a first motor 17 is installed on the left side of the outer wall of the pretreatment cavity 1, and a second motor 18 is installed at the top of the pretreatment cavity 1. The output end of the first motor 17 is fixedly connected to the spiral auger shaft inside the spiral guide cylinder 6, and the output end of the second motor 18 is fixedly connected to the rotating shaft 4.

[0040] In this embodiment, the first motor 17 and the second motor 18 drive the spiral auger shaft and the rotating shaft 4 to rotate, respectively.

[0041] As a technical optimization of this utility model, a temperature and humidity sensor 15 and a pH probe 16 are respectively provided on the upper and lower sides of the inner wall of the pretreatment chamber 1. A control panel 21 is provided on the front end of the outer wall of the pretreatment chamber 1. The temperature and humidity sensor 15, pH probe 16, metering pump 14, electric heating block 10, first motor 17 and second motor 18 are all electrically connected to the control panel 21.

[0042] In this embodiment: the temperature and humidity sensor 15 monitors the temperature and humidity gradient in different areas of the cavity in real time, the pH probe 16 detects the acidity and alkalinity of the reaction solution, and the control panel 21 automatically adjusts the heating power, stirring speed and liquid addition amount through PLC algorithm to maintain preset parameters, with a high degree of automation.

[0043] As a technical optimization of this utility model, the outer wall of the stirring blade 5 is provided with a plurality of evenly distributed through holes 19, and the upper end face of the stirring blade 5 is provided with a serrated structure 20.

[0044] In this embodiment: the through hole 19 reduces the stirring resistance and forms a local vortex, which enhances the penetration and mixing of starch and liquid. The serrated structure 20 generates high-frequency shearing when rotating at high speed, breaking up the agglomeration of starch particles and achieving a good stirring effect.

[0045] As a technical optimization of this utility model, the storage tank 12 is provided with two tanks, namely an acid-base tank and an enzyme preparation tank.

[0046] In this embodiment, acids and alkalis are stored in separate tanks to avoid cross-contamination. Depending on the pretreatment stage, such as gelatinization requiring the addition of alkali or enzymatic hydrolysis requiring the addition of enzymes, the control panel 21 automatically switches the type of liquid to be added.

[0047] As a technical optimization of this utility model, the steam jacket 7 includes a metal layer 22, and the interior of the metal layer 22 is provided with a heat insulation layer 23 and a heat preservation layer 24.

[0048] In this embodiment, the metal layer 22 is provided with a heat insulation layer 23 and a heat preservation layer 24 to reduce heat loss and improve heating efficiency.

[0049] As a technical optimization of this utility model, the atomizing nozzle assembly 11 includes four stainless steel nozzles with a nozzle spacing of 150mm and a nozzle diameter of 0.5mm.

[0050] In this embodiment: multiple nozzles are evenly distributed to cover the cross-section of the cavity, the nozzle diameter is 0.5mm to ensure that the liquid atomization particle size is ≤50μm, and the 150mm spacing avoids spray overlap or blind spots, so as to achieve uniform wetting of the starch surface.

[0051] The working principle and usage process of this utility model are as follows: During use, starch raw material enters the pretreatment chamber 1 through the feed inlet 2. The left-side spiral guide cylinder 6 rotates under the drive of the first motor 17, conveying and initially dispersing the starch towards the center of the pretreatment chamber 1. The spiral auger shaft of the spiral guide cylinder 6 reduces starch accumulation through mechanical propulsion, forming a continuous feed flow. The rotating shaft 4 drives the stirring blade 5 to rotate at high speed under the drive of the second motor 18. The serrated structure 20 and through holes 19 on the surface of the blades enhance the shearing force, breaking up starch particle agglomeration. The atomizing nozzle group 11 of the liquid addition mechanism atomizes and sprays the acid, alkali, or enzyme preparations from the storage tank 12 into the chamber, mixing them evenly with the starch. Uniform contact promotes gelatinization or enzymatic hydrolysis. Steam rapidly heats the pretreatment chamber 1 through the steam jacket 7. The pressure relief valve 9 ensures stable pressure. The bottom electric heating block 10 heats the bottom of the pretreatment chamber 1. Dual heating improves heating effect and efficiency. The temperature and humidity sensor 15 monitors the temperature and humidity inside the pretreatment chamber 1 in real time. The pH probe 16 detects the acidity and alkalinity of the reaction solution. The control panel 21 automatically adjusts the speed of the first motor 17 and the second motor 18, the power of the electric heating block 10, and the liquid addition amount of the metering pump 14 according to the sensor data to ensure precise and controllable reaction conditions. The processed starch slurry is discharged from the outlet 3.

[0052] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A pretreatment device for papermaking starch, characterized in that: include: The pretreatment chamber (1) is a cylindrical structure. The top left end of the pretreatment chamber (1) is provided with a feed inlet (2) and the bottom right end is provided with a discharge outlet (3). The mixing mechanism includes a rotating shaft (4) rotatably connected to the top of the pretreatment chamber (1), and a plurality of uniformly distributed stirring blades (5) are fixedly connected to the outer wall of the rotating shaft (4). A spiral guide cylinder (6) is installed on the left side of the top of the pretreatment chamber (1). The segmented heating assembly includes a steam heating section and an electric heating section. The steam heating section is a steam jacket (7) fixedly connected to the outer wall of the pretreatment chamber (1). The outer wall of the steam jacket (7) is connected to a steam inlet (8). A pressure relief valve (9) is provided on the top of the steam jacket (7). The electric heating section consists of multiple electric heating blocks (10) located at the bottom of the pretreatment chamber (1). The liquid adding mechanism includes an atomizing nozzle assembly (11) located on the right side of the top of the pretreatment chamber (1), a liquid storage tank (12) located on the right side of the top of the pretreatment chamber (1), a liquid guide pipe (13), and a metering pump (14). The atomizing nozzle assembly (11) is connected to the liquid storage tank (12) through the liquid guide pipe (13).

2. The pretreatment equipment for papermaking starch according to claim 1, characterized in that: A first motor (17) is installed on the left side of the outer wall of the pretreatment cavity (1), and a second motor (18) is installed at the top of the pretreatment cavity (1). The output end of the first motor (17) is fixedly connected to the spiral auger shaft inside the spiral guide cylinder (6), and the output end of the second motor (18) is fixedly connected to the rotating shaft (4).

3. The pretreatment equipment for papermaking starch according to claim 2, characterized in that: Temperature and humidity sensor (15) and pH probe (16) are respectively provided on the upper and lower sides of the inner wall of the pretreatment chamber (1). A control panel (21) is provided on the front end of the outer wall of the pretreatment chamber (1). The temperature and humidity sensor (15), pH probe (16), metering pump (14), electric heating block (10), first motor (17) and second motor (18) are all electrically connected to the control panel (21).

4. The pretreatment equipment for papermaking starch according to claim 1, characterized in that: The outer wall of the stirring blade (5) is provided with a plurality of uniformly distributed through holes (19), and the upper end face of the stirring blade (5) is provided with a serrated structure (20).

5. The pretreatment equipment for papermaking starch according to claim 1, characterized in that: The storage tank (12) is provided in two parts, namely an acid-base tank and an enzyme preparation tank.

6. The pretreatment equipment for papermaking starch according to claim 1, characterized in that: The steam jacket (7) includes a metal layer (22), and the interior of the metal layer (22) is provided with a heat insulation layer (23) and a heat preservation layer (24).

7. The pretreatment equipment for papermaking starch according to claim 1, characterized in that: The atomizing nozzle assembly (11) includes four stainless steel nozzles with a nozzle spacing of 150 mm and a nozzle diameter of 0.5 mm.

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