A cement grinding aid synthesis device

Abstract

The cement grinding aid synthesis equipment includes a rack, a synthesis reaction kettle, a stirring assembly and a rotation transmission assembly, the synthesis reaction kettle is arranged at the upper end of the rack, the stirring assembly is arranged through the middle of the synthesis reaction kettle, and the rotation transmission assembly is arranged outside the rack. The application forms an internal mechanical stirring and external kettle body rolling disturbance double mixing system by arranging the revolution-rotation composite stirring assembly matched with the rotation synthesis reaction kettle, and completely solves the industry pain points of the traditional reaction kettle, such as many stirring dead angles, material stratification, deposition retention and uneven reaction. The self-adaptive transmission structure of the worm gear and the gear ring meshing can realize the composite motion of the stirring paddle without additional driving equipment, the structure is compact, the energy consumption is lower, and the high and low viscosity grinding aid raw materials can be uniformly mixed in all directions without dead angle.

Description

Technical Field

[0001] This invention relates to the field of cement grinding aid production technology, and in particular to a cement grinding aid synthesis device. Background Technology

[0002] Existing cement grinding aid synthesis equipment mostly employs a fixed reactor with a single central stirring structure, resulting in a relatively simple stirring mode that relies solely on the unidirectional rotation of the stirring paddle for material mixing. In the synthesis of high-viscosity grinding aids such as polycarboxylate-based and complex alkanolamine-based agents, problems such as central eddy currents, wall stagnation, and bottom sedimentation easily occur, leading to significant differences in reaction rates across different areas within the reactor. This results in incomplete monomer polymerization, poor raw material mixing uniformity, and ultimately, large fluctuations in the grinding aid performance of the finished product and poor batch-to-batch consistency, severely impacting the cement grinding efficiency and product stability. Furthermore, traditional equipment relies solely on internal stirring components to agitate the material, while the reactor remains stationary, resulting in weak overall material convection. For multi-component, high-viscosity, and slow-reaction grinding aid formulations, this easily leads to defects such as localized reaction lag, uneven distribution of effective components, and low reaction conversion rates, making it difficult to meet the demands of large-scale synthesis and production of refined, high-quality grinding aids.

[0003] In addition, traditional synthesis equipment has a single function and lacks the synergistic cooperation between the overall self-rotation disturbance structure of the vessel and the combined revolution and rotation stirring structure. During the production process, it is necessary to rely on long-term stirring and high-temperature constant temperature to compensate for the reaction effect. This not only results in high energy consumption and long production cycle, but also long-term ineffective stirring can easily cause problems such as local overheating of materials, slight deterioration, and excessively wide molecular weight distribution, which further reduces the quality of the finished product. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing technology. The present invention proposes a cement grinding aid synthesis device.

[0005] To address the aforementioned issues in existing cement grinding aid synthesis equipment, which often employs a fixed reactor with a single central stirring structure, resulting in a limited mixing method that relies solely on the unidirectional rotation of the stirring paddle for material mixing, the present invention addresses these problems. In the synthesis of high-viscosity grinding aids such as polycarboxylate-based and complex alkanolamine-based equipment, issues such as central eddy currents, wall stagnation, and bottom sedimentation easily arise. This leads to significant differences in reaction rates across different regions within the reactor, incomplete monomer polymerization, and poor raw material mixing uniformity, ultimately resulting in large fluctuations in the grinding aid performance of the finished product and poor batch-to-batch consistency, severely impacting the cement grinding efficiency and product stability. Furthermore, traditional equipment relies solely on internal stirring components for material agitation, while the reactor remains stationary, resulting in weak overall material convection. For multi-component, high-viscosity, and slow-reaction grinding aid formulations, this easily leads to defects such as localized reaction lag, uneven distribution of effective components, and low reaction conversion rates, making it difficult to meet the technical challenges of large-scale synthesis and production of refined, high-quality grinding aids. The technical solution adopted in this invention is as follows: A cement grinding aid synthesis device includes: a frame, a synthesis reactor, a stirring assembly, and a rotation transmission assembly. The synthesis reactor is located at the upper end of the frame, the stirring assembly is disposed through the middle of the synthesis reactor, and the rotation transmission assembly is located on the outer side of the frame. The stirring assembly includes: a first reduction motor, a stirring main shaft, an extension frame, a stirring secondary shaft, a stirring paddle, and a stirring transmission unit. The stirring transmission unit includes a worm, a worm wheel, a fixed sleeve, a first gear ring, and a first gear, which are used to perform multi-dimensional, dead-angle-free stirring and mixing of the cement grinding aid raw materials in the synthesis reactor. The self-rotating transmission assembly includes: a bracket, rollers, wheel rails, a second reduction motor, a second gear, and a second gear ring, used to drive the entire synthesis reactor to rotate around its own axis.

[0006] Preferably, the synthesis reactor is rotatably mounted on the inner side of the upper end of the frame, and the synthesis reactor adopts a carbon steel tank structure with a heat exchange jacket.

[0007] Preferably, the outer wall of the synthesis reactor is provided with inlet and outlet ports for raw material input and output and a jacketed liquid inlet pipe for temperature control.

[0008] Preferably, the first geared motor is fixedly installed on the upper end face of the frame, and the stirring spindle is rotatably connected through the center position of the frame and the synthesis reactor, with the side end of the stirring spindle being driven and connected to the output end of the first geared motor.

[0009] Preferably, the extension frame is configured in multiple sets, which are symmetrically distributed and fastened along the axial direction of the stirring main shaft. The stirring sub-shaft is rotatably installed on the outer end of the extension frame, and the stirring paddle is symmetrically assembled on both sides of the stirring sub-shaft.

[0010] Preferably, the stirring transmission unit is driven by the stirring sub-shaft and is used for the combined stirring motion of the stirring paddle's revolution and rotation.

[0011] Preferably, the worm gear is rotatably mounted on the outer wall of the stirring main shaft, and the worm wheel is fixedly assembled in the middle position of the stirring auxiliary shaft, with the worm wheel and the worm gear forming a meshing transmission cooperation.

[0012] Preferably, the fixing sleeve is fixed to the inner side of the upper end of the frame, the first gear ring is fixedly installed on the outer end of the fixing sleeve, the first gear is fixedly assembled on the side end of the worm, and the first gear meshes with the first gear ring.

[0013] Preferably, the second geared motor is fixedly mounted on the outside of the frame, the second gear is fixed to the output end of the second geared motor, the second gear ring is fixed to the outer wall of the synthesis reactor, and the second gear meshes with the second gear ring for transmission.

[0014] Preferably, the bracket is symmetrically fixed on both sides of the lower end of the frame, the roller is rotatably assembled on the inner side of the bracket, the wheel rail is fixedly installed on the outer walls of both sides of the synthesis reactor, and the roller is rotatably supported on the inner side of the wheel rail.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention, by incorporating a combined revolution-rotation stirring assembly with a self-rotating synthesis reactor, forms a dual mixing system of internal mechanical stirring and external vessel tumbling and disturbance. This completely solves the industry pain points of traditional reactors, such as numerous dead zones in stirring, material stratification, sedimentation, and uneven reaction. Through an adaptive transmission structure involving a worm gear and a gear ring meshing, the combined motion of the stirring paddle can be achieved without additional drive equipment. The structure is compact, energy consumption is lower, and it can achieve comprehensive, dead-zone-free homogeneous mixing of high and low viscosity grinding aid raw materials. This effectively improves the reaction conversion rate of raw materials, reduces batch deviations in molecular weight and effective component content of the finished product, and significantly improves the quality stability and performance of cement grinding aid products.

[0016] Meanwhile, this invention employs a rotatable reactor body with a standardized heat exchange jacket structure, adaptable to the synthesis processes of various types of cement grinding aids, including polycarboxylate-based, alkanolamine-based, and composite functional agents. This significantly improves the equipment's versatility and production flexibility, meeting the demands of small-batch, multi-category, and high-quality production. The overall equipment features strong automation and coordination, stable structure, and excellent sealing performance, effectively reducing manual intervention costs and material losses, shortening the synthesis production cycle, and lowering production energy consumption and maintenance costs. It combines economic efficiency, practicality, and environmental friendliness, making it suitable for large-scale, refined industrial synthesis and production of cement grinding aids. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention. Figure 1 ; Figure 3 This is a cross-sectional view of the overall structure of the present invention. Figure 2 ; Figure 4 This is a partial cross-sectional view of point A in the present invention.

[0018] Reference numerals: 1. Frame; 2. Synthesis reactor; 21. Inlet / outlet; 22. Liquid inlet pipe; 3. Stirring assembly; 31. First geared motor; 32. Stirring main shaft; 33. Extension frame; 34. Stirring secondary shaft; 35. Stirring paddle; 36. Stirring transmission unit; 361. Worm; 362. Worm wheel; 363. Fixed sleeve; 364. First gear ring; 365. First gear; 4. Rotation transmission assembly; 41. Support; 42. Roller; 43. Wheel and rail; 44. Second geared motor; 45. Second gear; 46. Second gear ring. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0021] Please see Figures 1-4 This embodiment discloses a cement grinding aid synthesis equipment, suitable for the polymerization, condensation, and homogeneous compounding synthesis of liquid cement grinding aids such as alkanolamines and polycarboxylate-based materials. The equipment includes a frame 1, a synthesis reactor 2, a stirring assembly 3, and a rotation drive assembly 4. The synthesis reactor 2 is mounted at the upper end of the frame 1, and the stirring assembly 3 is installed throughout the middle region of the synthesis reactor 2 for multi-dimensional, dead-angle-free mixing of the cement grinding aid raw materials within the reactor. The rotation drive assembly 4 is located on the outside of the frame 1 and drives the synthesis reactor 2 to rotate around its own axis. This further enhances the mixing effect by causing the raw materials within the reactor to tumble and disturb during rotation, effectively solving the technical defects of traditional reactors, such as single stirring, material stratification, uneven reaction, and localized reaction lag.

[0022] The synthesis reactor 2 is rotatably mounted on the inner side of the upper end of the frame 1 via a rotating shaft, enabling overall rotatable installation. The synthesis reactor 2 adopts a carbon steel tank structure with a heat exchange jacket, allowing for heating via heat transfer oil and rapid cooling via circulating cooling water, meeting the multi-stage process requirements of heating, maintaining constant temperature, and gradient cooling in the grinding aid polymerization reaction. The outer wall of the synthesis reactor 2 is equipped with inlet / outlet ports 21 and a jacketed liquid inlet pipe 22. Various solid and liquid synthesis raw materials can be precisely introduced into the reactor through the inlet / outlet ports 21 to complete the material preparation process, and heat transfer oil or cooling water can be introduced through the jacketed liquid inlet pipe 22 for temperature adjustment.

[0023] The stirring assembly 3 includes a first geared motor 31, a stirring main shaft 32, an extension frame 33, a stirring secondary shaft 34, a stirring paddle 35, and a stirring transmission unit 36. The first geared motor 31 is bolted to the upper surface of the frame 1. The stirring main shaft 32 is rotatably connected to the center of the frame 1 and the synthesis reactor 2 via a bearing seat. The side end of the stirring main shaft 32 is connected to the output end of the first geared motor 31 via a coupling. Multiple extension frames 33 are arranged, symmetrically distributed along the axial direction of the stirring main shaft 32 and fastened with bolts. The stirring secondary shaft 34 is rotatably mounted on the outer end of the extension frame 33 via a rotating shaft. The stirring paddle 35 is symmetrically mounted on both sides of the stirring secondary shaft 34 via flat keys. The stirring transmission unit 36 ​​is in transmission cooperation with the stirring secondary shaft 34, and can drive the stirring secondary shaft 34 to rotate independently based on the revolution power of the stirring main shaft 32, realizing a composite stirring motion of revolution and rotation of the stirring paddle.

[0024] The stirring transmission unit 36 ​​includes a worm 361, a worm wheel 362, a fixed sleeve 363, a first gear ring 364, and a first gear 365. The worm 361 is rotatably mounted on the outer wall of the stirring main shaft 32 via a bearing seat. The worm wheel 362 is fixedly mounted on the middle position of the stirring auxiliary shaft 34 via a flat key, and the worm wheel 362 and the worm 361 form a meshing transmission cooperation. The fixed sleeve 363 is welded and fixed to the inner side of the upper end of the frame 1. The side end of the fixed sleeve 363 extends coaxially into the interior of the synthesis reactor 2 through a sealing bushing to ensure rotational sealing and prevent material leakage. The first gear ring 364 is fixedly installed on the outer end of the fixed sleeve 363 by locking screws. The first gear 365 is mounted on the side end of the worm 361 via a flat key, and the first gear 365 and the first gear ring 364 mesh with each other to form a fixed-axis meshing transmission structure.

[0025] The self-rotation transmission assembly 4 includes a bracket 41, rollers 42, wheel rails 43, a second gear motor 44, a second gear 45, and a second gear ring 46. The bracket 41 is symmetrically fixed to both sides of the lower end of the frame 1 by bolts. The rollers 42 are rotatably mounted on the inner side of the bracket 41 via pins. The wheel rails 43 are fixed to the outer walls of both sides of the synthesis reactor 2 by screws, and the rollers 42 provide rolling support on the inner side of the wheel rails 43, forming a stable rotational support structure for the synthesis reactor 2 and reducing frictional resistance and sway during the reactor's rotation. The second gear motor 44 is fixedly mounted on the outer side of the frame 1. The second gear 45 is keyed to the output end of the second gear motor 44. The second gear ring 46 is fixed to the outer wall of the synthesis reactor 2 by screws. The second gear 45 and the second gear ring 46 mesh externally, providing stable power for the overall rotation of the reactor.

[0026] Please continue reading. Figures 1-4 The specific working process of this equipment is as follows: First, the staff sequentially feeds the various cement grinding aid raw materials required for the formula into the synthesis reactor 2 through the inlet / outlet 21, completing the raw material feeding operation. After feeding is completed, the first reduction motor 31 is started, which drives the stirring main shaft 32 to rotate around the central axis of the reactor body. During the rotation of the stirring main shaft 32, it drives each set of extension frames 33 to revolve synchronously, so that the stirring auxiliary shaft 34 and stirring paddle 35 assembled at the end of the extension frame 33 revolve with the main shaft as a whole, performing large-scale, full-coverage revolving stirring of the materials in the reactor.

[0027] Meanwhile, during the revolution of the stirring main shaft 32, the worm 361 and the first gear 365 revolve synchronously with the main shaft. Since the first gear ring 364 is a fixed structure, the first gear 365 continuously meshes and rolls along the ring wall of the first gear ring 364, thereby driving the worm 361 to rotate. The worm 361, through the meshing transmission of the worm wheel 362, drives the stirring sub-shaft 34 to rotate independently relative to the extension frame 33, ultimately achieving high-speed rotation of the stirring paddle 35 while revolving with the main shaft. Through this composite motion structure, the materials in the central area, edge area, upper layer, and bottom layer of the vessel can be sheared, tumbled, and homogenized in all directions, completely eliminating dead zones in the stirring process and solving the problems of uneven mixing, viscosity stratification, and inconsistent reaction degree in traditional single-layer stirring.

[0028] While the stirring assembly 3 is operating, the second reduction motor 44 can be started. The second reduction motor 44 drives the second gear 45 to rotate. Through the meshing transmission between the second gear 45 and the second gear ring 46, the entire synthesis reactor 2 slowly rotates. During the rotation of the reactor, the material inside the reactor undergoes overall tumbling, convection, and disturbance along with the reactor wall, breaking the static accumulation state of the material. This allows the high-viscosity material at the bottom and the material retained at the edges to continuously participate in the reaction and mixing. This, combined with the mechanical stirring of the stirring assembly, forms a dual mixing effect of internal and external linkage and dynamic and static combination, significantly improving the uniformity and sufficiency of the grinding aid polymerization reaction, and effectively improving the batch stability and grinding aid performance of the finished product.

[0029] After the cement grinding aid raw materials in the reactor have completed the polymerization, compounding, and mixing synthesis process, the first reduction motor 31 and the second reduction motor 44 are turned off, so that the stirring structure and the reactor body rotation completely stop. Then, the inlet and outlet 21 are opened, and the synthesized qualified cement grinding aid product can be smoothly discharged, completing a single synthesis operation.

[0030] Example 1: Synthesis of Polycarboxylate-based High-Efficiency Cement Grinding Aid This embodiment uses the aforementioned equipment for the polymerization synthesis of polycarboxylate-based cement grinding aids. The synthesis reactor is a 10m³ standard carbon steel jacketed tank, and the overall equipment is designed to meet the medium-temperature, uniform-rate reaction process requirements for polycarboxylate monomer polymerization. During production, polyethylene glycol monomethyl ether, methacrylic acid, initiator aqueous solution, and deionized water are sequentially added into the reactor through the jacketed inlet pipe 22. The feed channel is then closed to complete the sealed material preparation. Subsequently, the first reduction motor 31 is started, controlling the rotation speed of the stirring shaft 32 to 120 r / min. The stirring paddle 35 rotates at high speed based on its revolution around the reactor via a worm gear drive, performing all-round shearing and mixing of the liquid monomers in the reactor, eliminating the phenomenon of high-viscosity materials adhering to the wall and stratification.

[0031] The second reduction motor 44 is started synchronously to control the overall low-speed rotation of the synthesis reactor 2, set at 8 r / min, so that the material inside the reactor continues to tumble and convect, breaking the static accumulation state. Combined with the heat transfer oil heating in the tank jacket, the reaction temperature inside the reactor is stably controlled at 75℃–85℃, and the constant-temperature polymerization reaction is carried out for 3 hours. Compared with traditional fixed-bottle single-shaft stirring equipment, this equipment significantly improves the uniformity of monomer mixing through the synergistic effect of compound stirring and reactor rotation, resulting in a more complete polymerization reaction, effectively narrowing the polymer molecular weight distribution range, and increasing the reaction conversion rate by more than 5%. After the reaction is completed, the temperature is rapidly reduced to 50℃ through the cooling water jacket, a neutralizing agent is added to adjust the pH value to 7.5–8.5, and the mixture is stirred and homogenized for 30 minutes to complete the synthesis. The final polycarboxylate grinding aid product has high transparency, no gel impurities, and significantly reduced batch performance deviation.

[0032] Example 2: Synthesis of Composite Alkylamine Cement Grinding Aid This embodiment uses the aforementioned equipment to synthesize a compound amine cement grinding aid consisting of triethanolamine, ethylene glycol, and additives, suitable for low-viscosity, multi-component compounding reaction processes. During production, triethanolamine, ethylene glycol, modified sodium sulfonate, functional additives, and pure water are added through the inlet / outlet 21 and the jacketed liquid inlet pipe 22, respectively, completing the closed-loop feeding process. The first reduction motor 31 is started, and the speed of the stirring shaft 32 is reduced to 80 r / min. The combined revolution and rotation of multiple stirring paddles 35 achieves rapid dispersion and fusion of the multi-component additives, avoiding the problem of localized enrichment and uneven dispersion of trace amounts of functional additives.

[0033] The self-rotation transmission component 4 is activated, controlling the reactor's rotation speed to 10 r / min. This overall tumbling and disturbance of the reactor enhances the bidirectional convective mixing of the light additives and heavy amine raw materials, preventing the sedimentation of the bottom heavy raw materials and the floating and stratification of the upper additives. The tank jacket uses hot water for constant temperature control, stabilizing the reaction temperature at 45℃–55℃. The synthesis process can be completed in 1.5 hours of constant-temperature compounding reaction. Compared to traditional equipment, this embodiment significantly shortens the compounding and stirring time, increases production efficiency by more than 20%, and ensures uniform fusion of all components. The resulting grinding aid has stronger stability, and when applied to cement grinding, it can stably increase the specific surface area of ​​cement, reduce grinding power consumption, and significantly optimize overall performance.

[0034] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A cement grinding aid synthesis device, characterized in that, include: The machine includes a frame, a synthesis reactor, a stirring assembly, and a rotation drive assembly. The synthesis reactor is located at the upper end of the frame, the stirring assembly is installed through the middle of the synthesis reactor, and the rotation drive assembly is located on the outer side of the frame. The stirring assembly includes: a first reduction motor, a stirring main shaft, an extension frame, a stirring secondary shaft, a stirring paddle, and a stirring transmission unit. The stirring transmission unit includes a worm, a worm wheel, a fixed sleeve, a first gear ring, and a first gear, which are used to perform multi-dimensional, dead-angle-free stirring and mixing of the cement grinding aid raw materials in the synthesis reactor. The self-rotating transmission assembly includes: a bracket, rollers, wheel rails, a second reduction motor, a second gear, and a second gear ring, used to drive the entire synthesis reactor to rotate around its own axis.

2. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The synthesis reactor is rotatably mounted on the inner side of the upper end of the frame, and the synthesis reactor adopts a carbon steel tank structure with a heat exchange jacket.

3. The cement grinding aid synthesis equipment according to claim 2, characterized in that, The outer wall of the synthesis reactor is respectively provided with inlet and outlet ports for raw material input and output and a jacketed liquid inlet pipe for temperature control.

4. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The first geared motor is fixedly installed on the upper end face of the frame, and the stirring spindle is rotatably connected through the center position of the frame and the synthesis reactor. The side end of the stirring spindle is connected to the output end of the first geared motor.

5. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The extension frame is configured in multiple sets, which are symmetrically distributed and fastened along the axial direction of the stirring main shaft. The stirring sub-shaft is rotatably installed on the outer end of the extension frame, and the stirring paddle is symmetrically assembled on both sides of the stirring sub-shaft.

6. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The stirring transmission unit is coupled with the stirring sub-shaft to perform a combined stirring motion of the stirring paddle's revolution and rotation.

7. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The worm gear is rotatably mounted on the outer wall of the stirring main shaft, and the worm wheel is fixedly assembled in the middle of the stirring auxiliary shaft, with the worm wheel and the worm gear forming a meshing transmission cooperation.

8. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The fixed sleeve is fixed to the inner side of the upper end of the frame, the first gear ring is fixedly installed on the outer end of the fixed sleeve, and the first gear is fixedly assembled on the side end of the worm gear, and the first gear meshes with the first gear ring.

9. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The second geared motor is fixedly mounted on the outside of the frame, the second gear is fixed to the output end of the second geared motor, and the second gear ring is fixed to the outer wall of the synthesis reactor, and the second gear meshes with the second gear ring for transmission.

10. The cement grinding aid synthesis equipment according to claim 1, characterized in that, The brackets are symmetrically fixed on both sides of the lower end of the frame, the rollers are rotatably mounted on the inner side of the brackets, the wheel rails are fixedly installed on the outer walls of both sides of the synthesis reactor, and the rollers are rotatably supported on the inner side of the wheel rails.

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