An internal circulation esterification kettle

Abstract

This application relates to the technical field of chemical equipment, and in particular to an internal circulation esterification kettle, which includes a kettle body, a circulating stirring assembly, a driving assembly, and a scraping assembly; a reaction chamber is provided inside the kettle body; the circulating stirring assembly includes a partition cylinder, a rotating shaft, a first paddle, and a driving member; a circulation chamber is formed between the outer wall of the partition cylinder and the inner wall of the kettle body; the first paddle is arranged on the rotating shaft; the driving member is used to drive the rotating shaft to rotate; when the rotating shaft rotates, the first paddle can push the material from the first end of the partition cylinder to the second end of the partition cylinder and then flow back to the first end through the circulation chamber; the driving assembly includes a first gear, a ring gear, a mounting bracket, and a second gear that form a planetary gear train; the scraping assembly includes a reciprocating lead screw, a guide rod, and a scraper. When the rotating shaft rotates, the scraper can rotate around the central axis of the rotating shaft and slide up and down along the inner wall of the kettle body. This application has the effects of improving the efficiency and uniformity of material mixing and reducing the adhesion of the material to the inner wall of the reaction kettle.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and particularly relates to an internal circulation esterification kettle. Background Art

[0002] The esterification reaction is a type of organic chemical reaction, mainly the reaction of an alcohol with a carboxylic acid or an inorganic oxyacid to form an ester and water. When the existing esterification reaction kettle is in use, usually the alcohol and the acid are respectively injected into the interior of the reaction kettle at one time, and then the raw materials are heated and stirred to promote the reaction. Therefore, material stirring is an extremely important step in the esterification reaction. This step is to fully mix the materials in the esterification reaction kettle, prepare for the subsequent esterification reaction, improve production efficiency, and ensure the yield of the product.

[0003] The stirring paddle of the traditional esterification reaction kettle is arranged in the middle of the reaction kettle. By rotating the stirring paddle, the material forms a vortex and presses the material towards the bottom of the reaction kettle. However, during the process of the upper-layer material pressing towards the bottom of the reaction kettle, it will be squeezed by the material flowing upward from the bottom of the reaction kettle, so that the materials still maintain each layer relatively stably, resulting in the problems of low material circulation efficiency and increased energy consumption of the stirrer; and when stirring, due to the certain viscosity of the material, the material close to the inner wall of the reaction kettle will have an adhesion effect with the reaction kettle. The flow rate of the material close to the stirring paddle is fast, while the flow rate of the material close to the inner wall of the reaction kettle is slow, further exacerbating the problem of uneven material mixing. Summary of the Invention

[0004] In order to improve the efficiency and uniformity of material mixing and reduce the adhesion of the material to the inner wall of the reaction kettle, the present application provides an internal circulation esterification kettle.

[0005] The internal circulation esterification kettle provided by the present application adopts the following technical solutions:

[0006] An internal circulation esterification kettle, comprising:

[0007] A kettle body, a reaction chamber for heating and reacting materials is arranged inside the kettle body, and the reaction chamber is cylindrical;

[0008] A circulating stirring assembly, the circulating stirring assembly includes a partition cylinder, a rotating shaft, a first paddle and a driving member; the partition cylinder is arranged in the reaction chamber, both ends of the partition cylinder are communicated with the reaction chamber, and a circulation chamber is formed between the outer wall of the partition cylinder and the inner wall of the kettle body; the rotating shaft is rotatably arranged on the kettle body and one end extends into the partition cylinder, and the central axis of the rotating shaft is coaxial with the central axis of the reaction chamber; the first paddle is arranged on the rotating shaft and is located inside the partition cylinder; the driving member is used to drive the rotating shaft to rotate; when the rotating shaft rotates, the first paddle can push the material from the first end of the partition cylinder to the second end of the partition cylinder and then flow back to the first end of the partition cylinder through the circulation chamber;

[0009] A driving assembly, the driving assembly includes a first gear, a ring gear, a mounting bracket and a second gear. The first gear is fixed on the rotating shaft and rotates together with the rotating shaft. The ring gear is arranged on the inner wall of the kettle body and is coaxial with the first gear. The mounting bracket is rotatably arranged on the rotating shaft. The second gear is rotatably arranged on the mounting bracket and meshes with the first gear and the ring gear to form a planetary gear train.

[0010] A scraping assembly, the scraping assembly includes a reciprocating lead screw, a guide rod and a scraper. The reciprocating lead screw is arranged on the second gear and rotates coaxially with the second gear. The guide rod is arranged on the mounting bracket and is parallel to the reciprocating lead screw. The scraper is slidably connected to the guide rod and is threadedly connected to the reciprocating lead screw. One end of the scraper is slidably abutted against the inner wall of the kettle body. When the rotating shaft rotates, the scraper can rotate around the central axis of the rotating shaft and reciprocate up and down along the inner wall of the kettle body.

[0011] By adopting the above technical solutions, the efficiency and uniformity of material mixing can be improved, and the adhesion of the material to the inner wall of the kettle body can be reduced. Specifically, when the first paddle rotates, it can promote the material to form a vortex flow in the reaction kettle, which not only completely disrupts the stratification of the material in the vertical direction, but also presses the material towards the bottom of the kettle body, further destroying the stratification structure of the material in the horizontal direction, so as to achieve full mixing of the material in the horizontal and vertical directions. The design of the partition cylinder effectively avoids the direct collision between the upper layer of material and the lower layer of material when the upper layer of material is pressed downwards, ensuring that the lower layer of material can smoothly flow back to the upper layer through the circulation cavity, forming a stable circulating flow path and greatly improving the circulation efficiency of the material. In addition, the driving assembly drives the scraper to rotate around the rotating shaft by the rotation of the rotating shaft. At the same time, combined with the action of the reciprocating lead screw and the guide rod, the scraper can also reciprocate up and down along the height direction of the kettle body during the rotation process, covering all corners of the inner side wall of the kettle body in all directions. Such a design enables the scraper to efficiently remove the material adhered to the inner side wall of the kettle body, thereby reducing the uneven mixing phenomenon caused by material adhesion and significantly improving the product yield and production efficiency.

[0012] Optionally, the circulating stirring assembly further includes a second paddle and a baffle. The second paddle is arranged on the rotating shaft and is located at the second end of the partition cylinder. The second paddle can stir the material flowing out of the second end of the partition cylinder and push it towards the inner wall of the kettle body. The baffle is arranged on the inner wall of the kettle body and is used to cooperate with the second paddle to shear the material.

[0013] By adopting the above technical solution, the second paddle can further stir the material flowing out from the second end of the separation cylinder, and push the material towards the inner wall of the kettle body, increasing the flow path and mixing effect of the material in the reaction chamber, reducing the accumulation phenomenon of the material at the second end of the separation cylinder, and improving the uniformity of the material. The baffle plate cooperates with the second paddle to form a shearing action on the material, effectively reducing the material stratification phenomenon and further breaking the material agglomeration phenomenon, enhancing the dispersibility and fluidity of the material, thereby significantly improving the mixing efficiency and reaction quality of the material.

[0014] Optionally, it further includes a heating coil arranged in the flow chamber for heating the material; the kettle body includes an inner kettle body and an outer kettle body; the outer kettle body is sleeved outside the inner kettle body, and the reaction chamber is opened in the inner kettle body; an isolation chamber is formed between the inner wall of the inner kettle body and the outer wall of the outer kettle body, and a communication hole for communicating the reaction chamber and the isolation chamber is provided at the top of the inner kettle body, and the gas in the reaction chamber can enter the isolation chamber through the communication hole.

[0015] By adopting the above technical solution, the heating coil can uniformly heat the material flowing through the flow chamber, promoting the esterification reaction process of the material, thereby improving the reaction efficiency and product quality; the isolation chamber formed between the inner kettle body and the outer kettle body can effectively block the heat of the material in the reaction chamber from being transferred to the outer kettle body, thereby reducing heat loss and improving energy utilization rate. At the same time, the steam generated in the reaction chamber can enter the isolation chamber through the communication hole, forming a heat preservation layer in the isolation chamber, further reducing heat dissipation, ensuring the temperature stability in the reaction chamber, and providing a more efficient heat environment for the esterification reaction.

[0016] Optionally, a jacket is sleeved outside the kettle body; a heat preservation chamber for the circulation of a heat conduction medium is formed between the inner wall of the jacket and the outer wall of the kettle body, and a heat conduction medium inlet and a heat conduction medium outlet for communicating with the heat preservation chamber are provided on the jacket.

[0017] By adopting the above technical solution, the circulation of the heat conduction medium in the heat preservation chamber can effectively control the temperature of the material in the kettle body, ensuring that the esterification reaction is carried out within an appropriate temperature range. The setting of the heat conduction medium inlet and the heat conduction medium outlet facilitates the replacement and circulation of the heat conduction medium, improves the stability and efficiency of temperature control, and further optimizes the conditions of the esterification reaction.

[0018] Optionally, the scraping assembly further includes a transmission shaft, a third gear, and a spiral blade; the transmission shaft is rotatably connected to the mounting frame, and the rotation axis of the transmission shaft is parallel to the rotation axis of the rotating shaft; the third gear is fixed on the transmission shaft and meshes with the second gear; the spiral blade is arranged on the transmission shaft and is located in the flow chamber, and the outer side of the spiral blade is in sliding contact with the outer wall of the separation cylinder; when the second gear rotates, it can drive the transmission shaft to rotate and make the spiral blade convey the material outside the second end of the separation cylinder to the first end and scrape the material on the outer wall of the separation cylinder.

[0019] By adopting the above technical solution, the rotation of the second gear can drive the rotation of the third gear and the transmission shaft, and the spiral blade can rotate along with the transmission shaft and convey the material outside the second end of the separation cylinder to the first end, effectively promoting the flow of the material in the circulation cavity and improving the uniformity of material mixing. At the same time, the spiral blade can also revolve around the central axis of the separation cylinder, and the design of the spiral blade slidingly abutting against the outer wall of the separation cylinder can scrape off the material adhering to any position on the outer side wall of the separation cylinder, reducing the adhesion of the material to the outer wall of the separation cylinder, thereby further avoiding the problem of uneven mixing caused by material adhesion.

[0020] Optionally, the helix direction of the spiral blade is the same as the rotation direction of the third gear.

[0021] By adopting the above technical solution, the conveying efficiency of the spiral blade for the material can be improved, and the scattering of the material caused by the centrifugal force of the rotation of the spiral blade can be reduced, so that the material forms a continuous and stable conveyance in the circulation cavity.

[0022] Optionally, a chute is formed on one side of the scraping plate that abuts against the inner wall of the kettle body, a butting strip is slidably arranged in the chute, and an elastic member is arranged between the butting strip and the scraping plate, and the elastic member is used to pop the butting strip outwards of the chute to slidably abut against the inner wall of the kettle body.

[0023] By adopting the above technical solution, the butting strip can pop outwards of the chute and slidably abut against the inner wall of the kettle body. This structure can ensure that when the scraping plate moves along the inner wall of the kettle body, the butting strip always closely fits the inner wall of the kettle body, thereby effectively removing the material adhering to the inner wall of the kettle body, reducing material residue and improving the cleaning effect. At the same time, the design of the elastic member can also adapt to the possible slight unevenness of the inner wall of the kettle body, further enhancing the uniformity and reliability of scraping.

[0024] Optionally, it further includes a reducer, the input shaft of the reducer is connected to the output shaft of the driving member, and the output shaft of the reducer is connected to the rotating shaft.

[0025] By adopting the above technical solution, the setting of the reducer can effectively reduce the rotation speed of the output shaft of the driving member and increase the torque, thereby ensuring the stable operation of the rotating shaft in a low-speed and high-torque state, improving the stirring efficiency, making the stirring process more stable and controllable, and avoiding problems such as material splashing or uneven mixing caused by too fast rotation speed.

[0026] Optionally, a cage is fixed on the separation cylinder, and the cage is rotationally connected to one end of the rotating shaft located inside the separation cylinder.

[0027] By adopting the above technical solution, the cage fixed on the separation cylinder can provide stable support for the rotating shaft, avoiding the deviation or vibration of the rotating shaft during high-speed rotation, thereby ensuring the smoothness of the stirring process. At the same time, this structural design helps to improve the durability and reliability of the equipment and extend the service life of the esterification kettle.

[0028] Optionally, the scraper is concave and the concave side faces the rotation direction of the scraper.

[0029] By adopting the above technical solution, when the scraper rotates to scrape the material on the inner wall of the kettle body, it can push the material towards the middle of the flow cavity to increase the flow rate of the material and further promote the uniform mixing of the material. At the same time, it can effectively increase the fitting area when the scraper contacts the inner wall of the kettle body and reduce the resistance when the scraper moves, further improving the scraping effect of the material on the inner wall of the kettle body.

[0030] In summary, the present application includes the following beneficial technical effects:

[0031] 1. It can improve the efficiency and uniformity of material mixing and reduce the adhesion of materials to the inner wall of the kettle body. Specifically, when the first paddle rotates, it can cause the material to form a vortex flow in the kettle body, not only completely disrupting the stratification of the material in the vertical direction, but also pressing the material towards the bottom of the kettle body, further destroying the stratification structure of the material in the horizontal direction, thereby achieving full mixing of the material in the horizontal and vertical directions; the design of the separation cylinder effectively avoids the direct collision between the upper-layer material and the lower-layer material when the upper-layer material is pressed downward, ensuring that the lower-layer material can smoothly flow back to the upper layer through the flow cavity, forming a stable circulating flow path and greatly improving the circulation efficiency of the material; in addition, the driving component drives the scraper to rotate around the rotating shaft by the rotation of the rotating shaft, and at the same time, combined with the action of the reciprocating lead screw and the guide rod, the scraper can also move up and down reciprocally along the height direction of the kettle body during the rotation process, covering all corners of the inner side wall of the kettle body in all directions. Such a design enables the scraper to efficiently remove the materials adhering to the inner side wall of the kettle body, thereby reducing the uneven mixing phenomenon caused by material adhesion and significantly improving the product yield and production efficiency;

[0032] 2. The second paddle can further stir the material flowing out from the second end of the separation cylinder and push the material towards the inner wall of the kettle body, increasing the flow path and mixing effect of the material in the reaction cavity, reducing the accumulation phenomenon of the material at the second end of the separation cylinder, and improving the uniformity of the material. The baffle plate cooperates with the second paddle to form a shearing action on the material, effectively reducing the material stratification phenomenon and further breaking the material agglomeration phenomenon, enhancing the dispersibility and fluidity of the material, thereby significantly improving the mixing efficiency and reaction quality of the material;

[0033] 3. The rotation of the second gear can drive the rotation of the third gear and the transmission shaft. The spiral blade can rotate with the transmission shaft and convey the materials outside the second end of the separation cylinder to the first end, effectively promoting the flow of materials in the circulation cavity and improving the uniformity of material mixing. At the same time, the spiral blade can also revolve around the central axis of the separation cylinder. The design of the spiral blade slidingly abutting against the outer wall of the separation cylinder can scrape off the materials attached to any position on the outer side wall of the separation cylinder, reducing the adhesion of the materials to the outer wall of the separation cylinder, thereby further avoiding the problem of uneven mixing caused by material adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.

[0035] Figure 2 is Figure 1 a partial enlarged view of part A in

[0036] Figure 3 is Figure 1 a partial enlarged view of part B in

[0037] DESCRIPTION OF THE REFERENCE NUMERALS: 1, kettle body; 11, inner kettle body; 111, communication hole; 112, material inlet; 113, material outlet; 12, outer kettle body; 121, steam outlet; 13, reaction cavity; 14, circulation cavity; 15, isolation cavity; 2, circulating stirring assembly; 21, separation cylinder; 22, rotating shaft; 23, first paddle; 24, driving member; 25, second paddle; 26, baffle plate; 27, cage; 3, driving assembly; 31, first gear; 32, gear ring; 33, mounting bracket; 34, second gear; 4, scraping assembly; 41, reciprocating lead screw; 42, guide rod; 43, scraping plate; 431, sliding groove; 44, transmission shaft; 45, third gear; 46, spiral blade; 47, abutting strip; 48, elastic member; 5, jacket; 51, heat preservation cavity; 52, heat-conducting medium inlet; 53, heat-conducting medium outlet; 6, reducer; 7, heating coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following Figures 1 - 3 is a further detailed description of the present application.

[0039] An embodiment of the present application discloses an internal circulation esterification kettle.

[0040] Referring to Figure 1 and Figure 2, in this embodiment, the internal circulation esterification kettle includes a kettle body 1, a circulating stirring assembly 2, a driving assembly 3 and a scraping assembly 4. Among them, the appearance of the kettle body 1 is a vertically arranged cylinder, and a reaction chamber 13 for accommodating and reacting materials is provided inside the kettle body 1, and the reaction chamber 13 is also cylindrical; the kettle body 1 includes an inner kettle body 11 and an outer kettle body 12, and the outer kettle body 12 is sleeved outside the inner kettle body 11, and one end of the outer kettle body 12 is fixed on the outer wall of the inner kettle body 11 to realize the connection between the two. The reaction chamber 13 is opened inside the inner kettle body 11, and a heating coil 7 for heating the materials is arranged inside the inner kettle body 11. A closed isolation chamber 15 is formed between the inner wall of the inner kettle body 11 and the outer wall of the outer kettle body 12. A communication hole 111 connecting the reaction chamber 13 and the isolation chamber 15 is provided at the top of the inner kettle body 11. The gas in the reaction chamber 13 can enter the isolation chamber 15 through the communication hole 111, so as to realize gas-liquid separation. Moreover, such a design can also prevent the heat of the materials from directly radiating to the outside through the outer kettle body 12 after the materials directly contact the outer kettle body 12, effectively blocking the heat transfer of the materials to the outer kettle body 12 and reducing heat loss.

[0041] A material inlet 112 and a material outlet 113 for connecting the reaction chamber 13 for the inlet and outlet of materials are respectively provided at the top and bottom of the inner kettle body 11. A steam outlet 121 for connecting the isolation chamber 15 for discharging the steam in the isolation chamber 15 is provided on the outer kettle body 12. A jacket 5 is sleeved outside the outer kettle body 12, and a heat preservation chamber 51 for the circulation of a heat transfer medium is formed between the inner wall of the jacket 5 and the outer wall of the outer kettle body 12. A heat transfer medium inlet 52 and a heat transfer medium outlet 53 communicating with the heat preservation chamber 51 are provided on the jacket 5. In this way, the heat transfer medium can circulate in the heat preservation chamber 51 through the heat transfer medium inlet 52 and the heat transfer medium outlet 53, so as to control the temperature of the materials in the kettle body 1 and ensure that the esterification reaction is carried out within a suitable temperature range. In other embodiments, the inner kettle body 11 and the outer kettle body 12 can also be of other shapes; the heating coil 7 can also be replaced with any other form of heater.

[0042] Referring to Figure 1 and Figure 2 , in this embodiment, the circulating stirring assembly 2 includes a partition cylinder 21, a rotating shaft 22, a first paddle 23, a driving member 24, a second paddle 25 and a baffle plate 26; the partition cylinder 21 is specifically a cylindrical stainless steel cylinder with a diameter smaller than the inner diameter of the inner kettle body 11, having corrosion resistance and high strength; the inner and outer surfaces of the partition cylinder 21 are both polished to reduce the adhesion of materials; the partition cylinder 21 is arranged in the reaction chamber 13 and is coaxial with the reaction chamber 13. A circulation chamber 14 communicating with the reaction chamber 13 is formed between the inner wall of the inner kettle body 11 and the outer wall of the partition cylinder 21, and the heating coil 7 is located in the circulation chamber 14; both ends of the partition cylinder 21 are open and communicate with the reaction chamber 13, and one end of the partition cylinder 21 located at the bottom of the reaction chamber 13 is fixedly connected to the bottom surface of the inner kettle body 11 through a plurality of connecting rods.

[0043] The rotating shaft 22 is specifically a hollow cylindrical shaft made of stainless steel, which not only reduces weight but also has high strength. The rotating shaft 22 is rotatably connected to the top of the outer kettle body 12 through a bearing, and one end of the rotating shaft 22 extends into the partition cylinder 21 and penetrates through the upper and lower ends of the partition cylinder 21. The central axis of the rotating shaft 22 is coaxial with the central axis of the reaction chamber 13. The first paddle 23 is an inclined blade paddle, and the material can be selected as stainless steel. The first paddle 23 is fixed on the rotating shaft 22 and is located within the partition cylinder 21. The end of the first paddle 23 facing away from the rotating shaft 22 is infinitely close to the inner wall of the partition cylinder 21 but does not contact it.

[0044] The driving member 24 is an electric motor, and the driving member 24 is used to drive the rotating shaft 22 to rotate. In this way, when the driving member 24 rotates, it drives the rotating shaft 22 to rotate. The first paddle 23 can suck the material from the first end of the partition cylinder 21, push the material to the second end of the partition cylinder 21, and then the material flows back to the first end of the partition cylinder 21 through the flow cavity 14, thereby realizing the circulating flow of the material and thoroughly disrupting the stratification of the material in the vertical and horizontal directions, and further enabling the material to be fully mixed and stirred.

[0045] Preferably, the internal circulation esterification kettle further includes a reducer 6. The reducer 6 can be a gear reducer with an adjustable transmission ratio. The input shaft of the reducer 6 is connected to the output shaft of the driving member 24, and the output shaft of the reducer 6 is connected to the rotating shaft 22. In this way, when the output shaft of the driving member 24 rotates, it can drive the rotating shaft 22 to rotate, and the reducer 6 can increase the torque of the rotating shaft 22. In other embodiments, the material of the partition cylinder 21 can also be selected as other high-strength and corrosion-resistant metal or alloy materials according to actual needs, such as nickel-based alloy or titanium alloy; the rotating shaft 22 can also be a solid shaft.

[0046] Referring to Figure 1 and Figure 2 , in this embodiment, the second paddle 25 is a straight blade paddle, and the material can also be selected as stainless steel. The second paddle 25 is fixed on the rotating shaft 22 and is located outside the second end of the partition cylinder 21; the baffle plate 26 is fixed on the inner wall of the inner kettle body 11 and is located outside the end of the second paddle 25 facing away from the rotating shaft 22. The baffle plate 26 is provided with a plurality of equidistant along the rotation axis of the rotating shaft 22. In this way, when the rotating shaft 22 rotates, the second paddle 25 further stirs the material flowing out from the second end of the partition cylinder 21 and pushes the material against the inner wall of the inner kettle body 11, thereby increasing the flow path and mixing effect of the material in the reaction chamber 13 and reducing the accumulation phenomenon of the material at the second end of the partition cylinder 21; the baffle plate 26 cooperates with the second paddle 25 to form a shearing action on the material, further breaking the material agglomeration phenomenon and improving the dispersibility and fluidity of the material.

[0047] Preferably, a cage 27 is arranged inside the partition cylinder 21. The cage 27 is made of the same material as the partition cylinder 21. One end of the cage 27 is welded and fixed to the inner wall of the partition cylinder 21, and the other end is rotatably connected to one end of the rotating shaft 22 located inside the partition cylinder 21 through a bearing. In this way, the cage 27 can provide stable support for the rotating shaft 22, avoiding the deviation or vibration of the rotating shaft 22 during high-speed rotation, thereby ensuring the smoothness of the stirring process.

[0048] Referring to Figure 1 and Figure 2 In this embodiment, the driving assembly 3 is arranged at the top end of the outer kettle body 12. The driving assembly 3 includes a first gear 31, a gear ring 32, a mounting bracket 33 and a second gear 34. The first gear 31 is a spur gear. The first gear 31 is fixed on the rotating shaft 22 and rotates together with the rotating shaft 22. The first gear 31 is coaxial with the rotating shaft 22. The gear ring 32 is a spur gear ring 32. The gear ring 32 is fixed on the inner side wall of the outer kettle body 12 and is coaxial with the first gear 31. The first gear 31 is located inside the gear ring 32. The mounting bracket 33 is rotatably connected to the rotating shaft 22 through a bearing. The second gear 34 is also a spur gear. The second gear 34 is rotatably arranged on the mounting bracket 33 through a bearing, and one side of the second gear 34 meshes with the first gear 31, and the other side meshes with the gear ring 32. In this way, the first gear 31, the gear ring 32, the mounting bracket 33 and the second gear 34 form a planetary gear train. When the rotating shaft 22 rotates, the second gear 34 can revolve around the rotating shaft 22 and also rotate on its own axis. In other embodiments, the tooth profiles of the first gear 31, the gear ring 32 and the second gear 34 can also be helical teeth or herringbone teeth.

[0049] Referring to Figure 1 and Figure 3 In this embodiment, the scraping assembly 4 includes a reciprocating lead screw 41, a guide rod 42, a scraper 43, a transmission shaft 44, a third gear 45 and a helical blade 46. One end of the reciprocating lead screw 41 is fixed to the end face of the second gear 34, and the other end extends to the bottom of the inner kettle body 11. The reciprocating lead screw 41 is coaxial with the second gear 34. The guide rod 42 is specifically a cylindrical stainless steel rod with an anti-adhesion coating on its surface to reduce material adhesion. One end of the guide rod 42 is fixed to the mounting bracket 33, and the other end extends to the bottom of the inner kettle body 11. The extending direction of the guide rod 42 is parallel to the extending direction of the reciprocating lead screw 41. The scraper 43 is slidably arranged on the guide rod 42 and is threadedly connected to the reciprocating lead screw 41, and one side of the scraper 43 is slidably abutted against the inner side wall of the inner kettle body 11. It should be noted that the reciprocating lead screw 41 is a mature existing technology. Therefore, the principle of its cooperation with the guide rod 42 to realize the reciprocating movement of the scraper 43 will not be elaborated here. In other embodiments, the guide rod 42 can also be a prism, and the material can also be selected from aluminum alloy or high-strength steel.

[0050] In this way, when the rotating shaft 22 rotates, the second gear 34 drives the reciprocating lead screw 41 to rotate together. Driven by the reciprocating lead screw 41 and the guide rod 42, the scraper 43 can revolve around the rotating shaft 22 with the central axis of the rotating shaft 22 as the rotation center and reciprocate up and down along the inner wall of the inner kettle body 11, so as to scrape the materials adhering to the inner wall of the inner kettle body 11, thereby reducing the problem of uneven mixing caused by material adhesion. Especially for the materials at the bottom corners of the inner kettle body 11, due to the low fluidity, the materials will form a "dead zone", and it is very difficult to mix the materials in this area evenly with the materials in other areas only by stirring; however, the setting of the scraper 43 can scrape the materials in this area to the area with high flow rate and then mix them fully with the materials in other areas.

[0051] Preferably, a chute 431 is formed on one side of the scraper 43 that slidably abuts against the inner side wall of the inner kettle body 11; a contact strip 47 is slidably arranged in the chute 431, and the sliding direction of the contact strip 47 is perpendicular to the inner side wall of the inner kettle body 11. The contact strip 47 is made of high-strength alloy steel and has high strength and wear resistance; an elastic member 48 is arranged between the contact strip 47 and the scraper 43. The elastic member 48 is a spring. One end of the elastic member 48 is fixedly connected to the bottom of the chute 431, and the other end is fixedly connected to the contact strip 47. The elastic member 48 can make the contact strip 47 pop out of the chute 431 and then slidably abut against the inner wall of the kettle body 1. Such a design can ensure that when the scraper 43 moves along the inner wall of the kettle body 1, the contact strip 47 always closely adheres to the inner wall of the kettle body 1, thereby effectively removing the materials adhering to the inner wall of the kettle body 1.

[0052] Preferably, the scraper 43 is concave and the concave surface faces the rotation direction of the scraper 43. In this way, when the scraper 43 rotates to scrape the materials on the inner wall of the kettle body 1, it can push the materials towards the middle of the flow cavity 14 to increase the flow rate of the materials and further promote the uniform mixing of the materials.

[0053] Refer to Figure 1 and Figure 3, in this embodiment, the transmission shaft 44 is specifically a cylindrical shaft made of stainless steel. One end of the transmission shaft 44 is rotatably connected to the mounting frame 33 through a bearing, and the other end extends to the bottom of the inner kettle body 11. The rotation axis of the transmission shaft 44 is parallel to the rotation axis of the rotating shaft 22; the third gear 45 is a spur gear, and the third gear 45 is fixed on the transmission shaft 44 and meshes with the second gear 34; the spiral blade 46 is welded and fixed on the transmission shaft 44 and is located in the flow cavity 14. The outer side of the spiral blade 46 is in sliding contact with the outer wall of the partition cylinder 21. In this way, when the second gear 34 rotates, it drives the third gear 45 to rotate, the transmission shaft 44 rotates together with the third gear 45, and the spiral blade 46 transports the material located outside the second end of the partition cylinder 21 to the outside of the first end of the partition cylinder 21 after the transmission shaft 44 rotates, thereby promoting the circulating flow of the material in the flow cavity 14; at the same time, the entire spiral blade 46 also revolves around the central axis of the partition cylinder 21. The design that the spiral blade 46 is in sliding contact with the outer wall of the partition cylinder 21 can scrape off the material attached to any position on the outer side wall of the partition cylinder 21.

[0054] Preferably, the spiral direction of the spiral blade 46 is the same as the rotation direction of the third gear 45. This design can improve the conveying efficiency of the spiral blade 46 for the material and reduce the phenomenon that the material scatters outside the spiral blade 46 due to the centrifugal force generated by the rotation of the spiral blade 46.

[0055] The implementation principle of an internal circulation esterification kettle in an embodiment of this application is as follows: When it is necessary to stir and mix materials, the driving member 24 drives the rotating shaft 22 to rotate. The rotation of the rotating shaft 22 drives the first paddle 23 to suck materials from the first end of the partition cylinder 21, and push the materials to the second end of the partition cylinder 21, and then return to the first end of the partition cylinder 21 via the circulation cavity 14, so as to realize the circulating flow of the materials, and thoroughly disrupt the stratification of the materials in the vertical and horizontal directions, and further fully mix and stir the materials; Then, the second paddle 25 on the rotating shaft 22 further stirs the materials flowing out from the second end of the partition cylinder 21, and pushes the materials towards the inner wall of the partition cylinder 21, so as to increase the flow path and mixing effect of the materials in the reaction cavity 13, and reduce the accumulation of materials at the second end of the partition cylinder 21; The baffle plate 26 cooperates with the second paddle 25 to form a shearing effect on the materials, further breaking the agglomeration of the materials and improving the dispersibility and fluidity of the materials; At the same time, after the rotating shaft 22 rotates, the second gear 34 drives the reciprocating lead screw 41 to rotate together. The scraper 43 revolves around the rotating shaft 22 with the center axis of the rotating shaft 22 as the rotation center and reciprocates up and down along the inner wall of the inner kettle body 11 under the drive of the reciprocating lead screw 41 and the guide rod 42, so as to scrape off the materials adhering to the inner wall of the inner kettle body 11, so as to reduce the problem of uneven mixing caused by material adhesion; In addition, after the second gear 34 rotates, it drives the third gear 45 to rotate. The transmission shaft 44 rotates together with the third gear 45. After the spiral blade 46 rotates with the transmission shaft 44, the materials located outside the second end of the partition cylinder 21 are conveyed to the outside of the first end of the partition cylinder 21, so as to promote the circulating flow of the materials in the circulation cavity 14; At the same time, the spiral blade 46 revolves around the central axis of the partition cylinder 21 as a whole to scrape off the materials attached to any position on the outer side wall of the partition cylinder 21.

[0056] The above are all preferred embodiments of this application, and the protection scope of this application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. An internal circulation esterification kettle, characterized in that, Comprising: A kettle body, within which there is a reaction chamber for heating and reacting materials, and the reaction chamber is cylindrical; A circulating stirring assembly, which includes a partition cylinder, a rotating shaft, a first paddle, and a driving member; the partition cylinder is arranged within the reaction chamber, both ends of the partition cylinder communicate with the reaction chamber, and a circulation chamber is formed between the outer wall of the partition cylinder and the inner wall of the kettle body; the rotating shaft is rotatably arranged on the kettle body and one end extends into the partition cylinder, and the central axis of the rotating shaft is coaxial with the central axis of the reaction chamber; the first paddle is arranged on the rotating shaft and is located within the partition cylinder; the driving member is used to drive the rotating shaft to rotate; when the rotating shaft rotates, the first paddle can push the material from the first end of the partition cylinder to the second end and then flow back to the first end of the partition cylinder via the circulation chamber; A driving assembly, which includes a first gear, a toothed ring, a mounting bracket, and a second gear, the first gear is fixed on the rotating shaft and rotates together with the rotating shaft; the toothed ring is arranged on the inner wall of the kettle body and is coaxial with the first gear; the mounting bracket is rotatably arranged on the rotating shaft; the second gear is rotatably arranged on the mounting bracket and meshes with the first gear and the toothed ring to form a planetary gear train; A scraping assembly, which includes a reciprocating lead screw, a guide rod, and a scraper, the reciprocating lead screw is arranged on the second gear and rotates coaxially with the second gear; the guide rod is arranged on the mounting bracket and is parallel to the reciprocating lead screw; the scraper is slidably connected to the guide rod and is threadedly connected to the reciprocating lead screw, and one end of the scraper slidably abuts against the inner wall of the kettle body; when the rotating shaft rotates, the scraper can rotate around the central axis of the rotating shaft and slide up and down along the inner wall of the kettle body; The scraping assembly further includes a transmission shaft, a third gear, and a spiral blade; the transmission shaft is rotatably connected to the mounting bracket, and the axis of rotation of the transmission shaft is parallel to the axis of rotation of the rotating shaft; the third gear is fixed on the transmission shaft and meshes with the second gear; the spiral blade is arranged on the transmission shaft and is located within the circulation chamber, and the outer side of the spiral blade slidably abuts against the outer wall of the partition cylinder; when the second gear rotates, it can drive the transmission shaft to rotate and make the spiral blade transport the material outside the second end of the partition cylinder to the first end and scrape the material on the outer wall of the partition cylinder; The spiral direction of the spiral blade is the same as the rotation direction of the third gear, and the scraper is located on the side of the spiral blade close to the inner kettle body.

2. The internal circulation esterification kettle according to claim 1, wherein: The circulating stirring assembly further includes a second paddle and a baffle plate, the second paddle is arranged on the rotating shaft and is located at the second end of the partition cylinder, and the second paddle can stir the material flowing out from the second end of the partition cylinder and push it towards the inner wall of the kettle body; the baffle plate is arranged on the inner wall of the kettle body and is used to cooperate with the second paddle to shear the material.

3. The internal circulation esterification kettle according to claim 1, characterized in that: It also includes a heating coil arranged in the circulation chamber for heating the material; the kettle body includes an inner kettle body and an outer kettle body; the outer kettle body is sleeved outside the inner kettle body, and the reaction chamber is arranged inside the inner kettle body; an isolation chamber is formed between the inner wall of the inner kettle body and the outer wall of the outer kettle body, a communication hole communicating the reaction chamber and the isolation chamber is arranged at the top of the inner kettle body, and the gas in the reaction chamber can enter the isolation chamber through the communication hole.

4. The internal circulation esterification kettle according to claim 1, characterized in that: A jacket is sleeved outside the kettle body; a heat preservation chamber for the circulation of a heat conduction medium is formed between the inner wall of the jacket and the outer wall of the kettle body, and a heat conduction medium inlet and a heat conduction medium outlet communicating with the heat preservation chamber are arranged on the jacket.

5. The internal circulation esterification kettle according to claim 1, characterized in that: A chute is formed on one side of the scraper in contact with the inner wall of the kettle body, an abutting strip is slidably arranged in the chute, and an elastic member is arranged between the abutting strip and the scraper, and the elastic member is used to pop the abutting strip outwards of the chute to slidably abut against the inner wall of the kettle body.

6. The internal circulation esterification kettle according to claim 1, characterized in that: It also includes a speed reducer, the input shaft of the speed reducer is connected to the output shaft of the driving member, and the output shaft of the speed reducer is connected to the rotating shaft.

7. An internal circulation esterification kettle according to claim 1, characterized in that: A cage is fixed on the partition cylinder, and the cage is rotatably connected to one end of the rotating shaft located inside the partition cylinder.

8. The internal circulation esterification kettle according to claim 1, characterized in that: The scraper is concave-shaped and the concave surface faces the rotating direction of the scraper.

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