A stirring device for producing hydroxypropyl methylcellulose

Abstract

The present application relates to the technical field of cellulose production, and in particular to a stirring device for hydroxypropyl methylcellulose production, which includes a reactor, the internal space of which is set to be spherical; a first stirring component, including a vertical rotating shaft rotatably arranged on the reactor, a spiral stirring blade fixedly arranged on the vertical rotating shaft, and a first driving member for driving the vertical rotating shaft to rotate; a second stirring component, including a horizontal rotating shaft rotatably arranged on both sides of the reactor, an arc stirring blade fixedly arranged on the horizontal rotating shaft, and a second driving member for driving the horizontal rotating shaft to rotate; the two arc stirring blades rotate in opposite directions. The present application has the effect of improving the uniformity and mixing degree of the material.

Description

Technical Field

[0001] The present application relates to the technical field of cellulose production, and in particular to a stirring device for producing hydroxypropyl methylcellulose. Background Art

[0002] Hydroxypropyl methylcellulose, also known as hypromellose, is a type of non-ionic cellulose mixed ether. It is a semi-synthetic, inactive, polymer that is widely used in textile, synthetic resin, petrochemical, ceramic, papermaking, leather, medicine, food and cosmetics industries.

[0003] The process flow of hydroxypropyl methylcellulose is: refined cotton crushing - alkali - feeding - alkalization - etherification - solvent recovery and washing - centrifugal separation - drying - crushing - mixing - finished product packaging. Among them, cellulose alkalization and etherification are carried out under heterogeneous conditions (using external force to stir evenly).

[0004] The existing stirring device drives the stirring blade to rotate through a motor to achieve material mixing. However, water, alkali, refined cotton and etherifying agent are prone to stratification in the solvent system. The stirring form of the above stirring device is relatively single and cannot solve the stratification problem well. It often takes a long time of stirring to achieve the alkalization and etherification effects. Utility Model Content

[0005] In order to solve the stratification phenomenon during stirring, the present application provides a stirring device for producing hydroxypropyl methylcellulose.

[0006] The present application provides a stirring device for producing hydroxypropyl methylcellulose using the following technical solution:

[0007] A stirring device for producing hydroxypropyl methylcellulose, comprising:

[0008] A reactor, wherein the internal space is configured to be spherical;

[0009] The first stirring assembly comprises a vertical rotating shaft rotatably arranged on the reaction kettle, a spiral stirring blade fixedly arranged on the vertical rotating shaft, and a first driving member for driving the vertical rotating shaft to rotate;

[0010] The second stirring assembly includes a transverse rotating shaft rotatably arranged on both sides of the reaction kettle, an arc-shaped stirring blade fixedly arranged on the transverse rotating shaft, and a second driving member for driving the transverse rotating shaft to rotate; the two arc-shaped stirring blades rotate in opposite directions.

[0011] By adopting the above technical solution, the first driving member drives the spiral stirring blade to rotate, so that the spiral stirring blade can not only stir the material horizontally but also drive the material to stir vertically, so that the material is not easy to be stratified. At the same time, the second driving member drives the arc stirring blade to rotate. When the two arc stirring blades rotate, they can stir the material vertically so that the materials in each layer can be mixed more evenly. The two arc stirring blades rotate in opposite directions, which can increase the turbulence of the material and further improve the uniformity and mixing degree.

[0012] Optionally, connecting plates are evenly distributed on the spiral stirring blades, and the connecting plates are vertically arranged.

[0013] By adopting the above technical solution, the connecting plate can stir and push the material horizontally, thereby increasing the contact area with the material and improving the stirring efficiency and mixing degree.

[0014] Optionally, a through hole is provided on the connecting plate.

[0015] By adopting the above technical solution, the through holes can not only reduce the weight of the connecting plate, but also disperse the materials, thereby improving the dispersion of the materials and making it easier to mix the materials together.

[0016] Optionally, the first driving member is a first reduction motor fixedly arranged on the reactor, and an output end of the first reduction motor is connected to the vertical rotating shaft.

[0017] By adopting the above technical solution, the first reduction motor can drive the vertical rotating shaft to rotate, so that the vertical rotating shaft drives the spiral stirring blades to rotate, thereby stirring the material.

[0018] Optionally, the second driving member is a second reduction motor fixedly arranged on the reaction kettle, and an output end of the second reduction motor is connected to the transverse rotating shaft.

[0019] By adopting the above technical solution, the first reduction motor can drive the transverse rotating shaft to rotate, so that the transverse rotating shaft drives the arc-shaped stirring blades to rotate, thereby stirring the material.

[0020] Optionally, a plurality of viscosity sensors are fixedly arranged on the inner wall of the reactor in sequence from top to bottom, and a controller is fixedly arranged on the reactor, and the controller is electrically connected to the viscosity sensor and the second reduction motor.

[0021] By adopting the above technical solution, the viscosity sensor can monitor the viscosity changes of each layer of materials in the reactor in real time and transmit the signal to the controller fixed on the reactor. The controller can dynamically adjust the speed of the second reduction motor according to the received viscosity data, thereby controlling the stirring speed of the arc stirring blade and reducing the stratification of the material.

[0022] Optionally, a temperature sensor is fixedly provided on the inner wall of the reactor, a heating wire and a cooling tube are embedded in the reactor, a solenoid valve is fixedly provided on the cooling tube, and the controller is electrically connected to the temperature sensor, the heating wire and the solenoid valve.

[0023] By adopting the above technical solution, the temperature sensor is used to monitor the temperature in the reactor in real time. The heating wire is used to provide the necessary heating function, and the cooling pipe controls the circulation of the coolant through the electromagnetic valve fixed on it to achieve rapid temperature adjustment and ensure that the temperature in the reactor can be controlled within the set range.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The first driving member drives the spiral stirring blade to rotate, so that the spiral stirring blade can not only stir the material horizontally but also drive the material to stir vertically, so that the material is not easy to be stratified. At the same time, the second driving member drives the arc stirring blade to rotate. When the two arc stirring blades rotate, they can stir the material vertically so that the materials in each layer can be mixed more evenly. The two arc stirring blades rotate in opposite directions, which can increase the turbulence of the material and further improve the uniformity and mixing degree.

[0026] 2. The temperature sensor is used to monitor the temperature in the reactor in real time. The heating wire is used to provide the necessary heating function, while the cooling tube controls the circulation of the coolant through the solenoid valve fixed on it to achieve rapid temperature adjustment and ensure that the temperature in the reactor can be controlled within the set range. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view of an embodiment of the present application.

[0029] Figure numerals: 1, reactor; 21, vertical rotating shaft; 22, spiral stirring blade; 221, connecting plate; 23, first reduction motor; 31, horizontal rotating shaft; 32, arc-shaped stirring blade; 33, second reduction motor; 41, viscosity sensor; 42, controller; 43, temperature sensor; 44, heating wire; 45, cooling tube; 46, solenoid valve. DETAILED DESCRIPTION

[0030] The technical solution in this application is further described in detail below in conjunction with the accompanying drawings.

[0031] The present application discloses a stirring device for producing hydroxypropyl methylcellulose. Figure 1 and Figure 2A stirring device for producing hydroxypropyl methylcellulose includes a reactor 1, a first stirring component and a second stirring component. The internal space of the reactor 1 is set to be spherical, which is conducive to the multi-directional flow of materials and reduces dead corners. The first stirring component and the second stirring component work together to stir in multiple directions to achieve efficient stirring of the materials, which is conducive to all-round mixing of the materials.

[0032] For details, please refer to Figure 2 The first stirring assembly includes a vertical rotating shaft 21 rotatably arranged on the reactor 1, a spiral stirring blade 22 fixedly arranged on the vertical rotating shaft 21, and a first driving member for driving the vertical rotating shaft 21 to rotate. The vertical rotating shaft 21 is rotatably arranged at the top center position of the reactor 1 through a bearing to ensure its stable and smooth rotation. The spiral stirring blade 22 extends spirally along the length direction of the vertical rotating shaft 21, so that the spiral stirring blade 22 can effectively lift the material to a certain extent when rotating with the vertical rotating shaft 21. The spiral stirring blade 22 allows the material to be effectively stirred in the vertical direction, reduces the stratification phenomenon, thereby forming an up and down circulation flow, and enhancing the stirring effect.

[0033] For further information, please refer to Figure 2 The spiral stirring blade 22 is evenly distributed with connecting plates 221, which are vertically arranged to increase the lateral stirring area of ​​the spiral stirring blade 22, so that it can lift the material up and down while also stirring the material more fully in the horizontal direction, thereby further improving the stirring effect.

[0034] For further information, please refer to Figure 2 , a through hole is also provided on the connecting plate 221. The through hole enables the material to pass through the connecting plate 221 more smoothly during the stirring process, reduces the resistance during stirring, and also increases the dispersion between the materials, which is conducive to faster and more uniform mixing of the materials.

[0035] Please refer to Figure 1 and Figure 2 In this embodiment, the first driving member is a first reduction motor 23 fixedly arranged on the top of the reactor 1, and the output end of the first reduction motor 23 is fixedly connected to the upper end of the vertical shaft 21 through a coupling. The first reduction motor 23 can provide a stable driving force to ensure that the vertical shaft 21 and the spiral stirring blade 22 rotate smoothly at a set speed.

[0036] Please refer to Figure 2The second stirring assembly includes a transverse rotating shaft 31 rotatably arranged on both sides of the reactor 1, an arc-shaped stirring blade 32 fixedly arranged on the transverse rotating shaft 31, and a second driving member for driving the transverse rotating shaft 31 to rotate. The two arc-shaped stirring blades 32 rotate in opposite directions, which can generate convection in the transverse direction, further break the stratified state of the material, improve the uniformity of stirring, and effectively prevent the occurrence of material stratification.

[0037] Please refer to Figure 1 and Figure 2 In this embodiment, the second driving member is a second reduction motor 33 fixedly arranged on the side wall of the reactor 1, and the output end of the second reduction motor 33 is fixedly connected to one end of the horizontal shaft 31 through a coupling. Similar to the first reduction motor 23, the second reduction motor 33 can also provide a stable driving force to ensure that the horizontal shaft 31 and the arc-shaped stirring blade 32 rotate smoothly at a set speed.

[0038] Please refer to Figure 2 , a plurality of viscosity sensors 41 are fixedly arranged on the inner wall of the reactor 1 from top to bottom, and a controller 42 is fixedly arranged on the outside of the reactor 1, and the controller 42 is electrically connected to the viscosity sensor 41 and the second reduction motor 33 at the same time. The viscosity sensor 41 can detect the viscosity of the material at different heights in the reactor 1 in real time, and transmit the detected viscosity value to the controller 42. The controller 42 has a preset viscosity threshold. When the received viscosity value exceeds the threshold, the controller 42 will adjust the speed of the second reduction motor 33 according to the preset control logic, thereby changing the stirring speed of the arc stirring blade 32, so as to achieve effective control of the viscosity of the material and effectively prevent the occurrence of material stratification.

[0039] In addition, please refer to Figure 2 , a temperature sensor 43 is fixedly arranged on the inner wall of the reactor 1 for real-time monitoring of the temperature in the reactor 1. At the same time, a heating wire 44 and a cooling tube 45 are embedded on the inner wall of the reactor 1, which are used to heat and cool the reactor 1 respectively. The heating wire 44 is connected to an external power supply, and the cooling tube 45 is connected to an external cooling device, so that the reactor 1 can be cooled when the coolant flows through. A solenoid valve 46 is fixedly arranged on the cooling tube 45 for controlling the circulation of the coolant. The controller 42 is electrically connected to the temperature sensor 43, the heating wire 44 and the solenoid valve 46 at the same time. When the temperature sensor 43 detects that the temperature in the reactor 1 is lower than the set value, the controller 42 controls the heating wire 44 to heat; when the temperature is higher than the set value, the controller 42 controls the solenoid valve 46 to open, so that the cooling tube 45 passes the coolant to cool down, so as to ensure that the temperature in the reactor 1 is stable within the required range.

[0040] The implementation principle of the embodiment of the present application is: start the first reduction motor 23 and the second reduction motor 33 to respectively drive the vertical rotating shaft 21 and the horizontal rotating shaft 31 to rotate, and then drive the spiral stirring blades 22 and the arc stirring blades 32 to stir the materials in the reactor 1 in multiple directions and at multiple levels.

[0041] The viscosity sensor 41 monitors the viscosity change of the material in real time and sends the monitored viscosity data to the controller 42. The controller 42 dynamically adjusts the speed of the second reduction motor 33 according to the received viscosity data and the preset viscosity threshold, thereby controlling the stirring speed of the arc stirring blade 32.

[0042] The temperature in the reactor 1 is monitored in real time by the temperature sensor 43, and the monitored temperature data is sent to the controller 42. The controller 42 controls the heating power of the heating wire 44 and the opening and closing of the electromagnetic valve 46 according to the received temperature data and the preset temperature range, so as to control the temperature in the reactor 1.

[0043] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stirring device for producing hydroxypropyl methylcellulose, characterized in that: include: The reaction kettle (1) has an internal space configured to be spherical; A first stirring assembly comprises a vertical rotating shaft (21) rotatably arranged on the reaction kettle (1), a spiral stirring blade (22) fixedly arranged on the vertical rotating shaft (21), and a first driving member for driving the vertical rotating shaft (21) to rotate; The second stirring assembly comprises a transverse rotating shaft (31) rotatably arranged on both sides of the reaction kettle (1), an arc-shaped stirring blade (32) fixedly arranged on the transverse rotating shaft (31), and a second driving member for driving the transverse rotating shaft (31) to rotate; the two arc-shaped stirring blades (32) rotate in opposite directions.

2. A stirring device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The spiral stirring blades (22) are evenly distributed with connecting plates (221), and the connecting plates (221) are arranged vertically.

3. A stirring device for producing hydroxypropyl methylcellulose according to claim 2, characterized in that: The connecting plate (221) is provided with a through hole.

4. A stirring device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The first driving member is a first reduction motor (23) fixedly arranged on the reaction kettle (1), and an output end of the first reduction motor (23) is connected to the vertical rotating shaft (21).

5. A stirring device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The second driving member is a second reduction motor (33) fixedly arranged on the reaction kettle (1), and an output end of the second reduction motor (33) is connected to the transverse rotating shaft (31).

6. A stirring device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: A plurality of viscosity sensors (41) are fixedly arranged on the inner wall of the reaction kettle (1) in sequence from top to bottom, and a controller (42) is fixedly arranged on the reaction kettle (1), wherein the controller (42) is electrically connected to the viscosity sensors (41) and the second reduction motor (33).

7. A stirring device for producing hydroxypropyl methylcellulose according to claim 6, characterized in that: A temperature sensor (43) is fixedly arranged on the inner wall of the reaction kettle (1); a heating wire (44) and a cooling pipe (45) are embedded in the reaction kettle (1); a solenoid valve (46) is fixedly arranged on the cooling pipe (45); and the controller (42) is electrically connected to the temperature sensor (43), the heating wire (44) and the solenoid valve (46).

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