Grinding mechanism for benzotriazole production
By employing techniques such as spiral cooling water pipes, a combination of inverted conical inclined plates and grinding rings, and friction from conical block extrusion plates, the problems of temperature rise and particle unevenness during benzotriazole grinding were solved, achieving efficient and uniform grinding results, and improving product purity and equipment operational stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI TRUST CHEM CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-05-19
AI Technical Summary
In the existing benzotriazole grinding process, the increased friction temperature affects grinding efficiency and quality, and the particles are uneven, easily sticking together to form hard lumps, leading to equipment blockage and changes in molecular structure, which affect purity and quality.
By employing techniques such as spiral cooling water pipe design, combination of inverted conical inclined plate and grinding ring, friction between conical block and extrusion plate, and pre-drying treatment of heating ring, we can ensure temperature uniformity and particle uniformity, reduce agglomeration and adhesion, and improve grinding efficiency and purity.
It achieves uniform crushing and efficient grinding, reduces particle agglomeration and adhesion, improves grinding efficiency and the purity of benzotriazole, and ensures continuous operation of the equipment and product quality.
Smart Images
Figure CN224252958U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of benzotriazole production technology, and specifically to a grinding mechanism for benzotriazole production. Background Technology
[0002] The preparation method of benzotriazole is to dissolve o-phenylenediamine in water at 50°C, then add glacial acetic acid, cool to 5°C, add sodium nitrite and stir to react; then let stand at room temperature for 2 hours, cool, filter out the crystals, wash with ice water, dry to obtain crude product, distill the crude product under reduced pressure, and recrystallize with benzene to obtain the final product. The particle size of benzotriazole obtained by the above method is not uniform, and it must be ground to obtain benzotriazole particles with smaller and uniform particle size.
[0003] Currently, after grinding benzotriazole, particles of different sizes need to be collected. During frequent transfers, these particles may clump together due to contact with moisture, which affects the purity and quality of benzotriazole.
[0004] Chinese patent literature discloses a grinding mechanism for benzotriazole (publication number CN220634695U), including a base plate, an extrusion assembly and a stirring assembly disposed above the base plate and cooperating with each other, and a drive assembly disposed above the base plate and connected to both the extrusion assembly and the stirring assembly; the drive assembly includes an outer box fixed to the top of the base plate, a motor fixed to the top of the base plate and located inside the outer box, an inner box, and a first output shaft, a second output shaft, and a third output shaft that are horizontally and rotatably connected in the inner box and distributed sequentially from top to bottom, with the motor's rotation shaft horizontally arranged and connected to the left end of the third output shaft; however, the following defects still exist in the implementation process:
[0005] While the device described in the aforementioned literature can convert large benzotriazole particles into small particles in one go, eliminating the need for repeated transfer and crushing of benzotriazole, thus significantly simplifying the grinding process and improving production efficiency, and greatly reducing the possibility of benzotriazole coming into contact with moisture, the low melting point of benzotriazole means that during the grinding process, when the temperature approaches the melting point, the BTA particles soften and stick together, forming hard lumps that clog the equipment and disrupt particle size uniformity. High temperatures may also cause changes in molecular structure (such as oxidation or decomposition), reducing corrosion inhibition efficiency or ultraviolet absorption capacity. Traditional air cooling or natural heat dissipation is insufficient, requiring frequent shutdowns for cooling, affecting continuous production and reducing grinding efficiency. Utility Model Content
[0006] The purpose of this invention is to provide a grinding mechanism for benzotriazole production, so as to solve the problem mentioned in the background art that the grinding efficiency and quality are affected by the increase in friction temperature during the grinding process of benzotriazole.
[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0008] A grinding mechanism for benzotriazole production includes a main body; a transmission box is fixedly connected to the top of the main body, a fixed top cover is fixedly connected to the bottom of the transmission box, a grinding assembly is arranged inside the main body, the grinding assembly includes a grinding cylinder fixedly connected inside the main body, a limit ring is fixedly connected to the outer wall of the grinding cylinder, a pipe is fixedly connected to the middle position of the limit ring, the pipe is arranged in a spiral shape, and the limit ring is connected to an external water pump.
[0009] In the above technical solution, the pipe is fixed to the outer wall of the grinding cylinder in a spiral shape. Cooling water is sent into the pipe by an external water pump. The spiral flow channel design of the pipe extends the flow path of the cooling water on the surface of the grinding cylinder, increases the heat exchange area, makes the temperature distribution of the cavity uniform, and ensures that the benzotriazole particles are uniformly broken under the action of the grinding components, reducing agglomeration.
[0010] A further improvement of this utility model is that: an inclined plate is fixedly connected to the inner wall of the grinding cylinder, the inclined plate is inverted conical shape, a connecting base is fixedly connected to the bottom of the fixed top cover, a receiving rod is fixedly connected to the inner wall of the connecting base, a grinding ring is fixedly connected to the outer wall of the receiving rod, a first scraper is fixedly connected to the outer wall of the grinding ring, the first scraper and the inclined plate are in contact, the grinding ring and the inclined plate are slidably connected at the middle position, and a filter screen is provided at the middle position of the inclined plate.
[0011] Using the above technical solution, the inclined plate is set in an inverted cone shape. When benzotriazole is placed in it, it will gradually converge towards the bottom of the inclined plate with the inclination arc of the inclined plate. It should be noted that a filter screen is provided at the bottom of the inclined plate, and the grinding ring is in contact with it. When the receiving rod starts to rotate under the action of the transmission box, friction is generated between the grinding ring and the filter screen, thereby crushing the benzotriazole.
[0012] A further improvement of this utility model is that: a conical block is fixedly connected to the outer wall of the receiving rod, the top of the conical block is set with an inclined surface, an extrusion block is fixedly connected to the inner wall of the grinding cylinder, an extrusion sheet is fixedly connected to the inner side wall of the extrusion block, the extrusion sheet is elastically set, and the extrusion sheet and the outer wall of the conical block are in contact.
[0013] Using the above technical solution, the surface of the block is set at an angle. When the benzotriazole is ground and falls from the filter screen, it will slide down to the joint between the extrusion block and the conical block according to the shape and contour of the conical block surface. Since the conical block and the receiving rod are an integral structure, the conical block rotates during the grinding process and rubs against the extrusion plate inside the extrusion plate.
[0014] A further improvement of this utility model is that the bottom of the extrusion block is inclined.
[0015] Using the above technical solution, benzotriazole undergoes secondary grinding and then falls through the inclined surface at the bottom of the extrusion block, eliminating the need for secondary grinding and reducing the possibility of it coming into contact with external substances.
[0016] A further improvement of the present invention is that: a filter screen plate is slidably connected to the bottom of the grinding cylinder, an arc plate is fixedly connected to the bottom of the filter screen plate, the arc plate is set in an inwardly bent arc shape, and a second scraper is fixedly connected to the outer wall of the receiving rod, the second scraper is set at an inclination, and the second scraper and the filter screen plate are in contact.
[0017] In the above technical solution, after secondary grinding, benzotriazole falls onto the filter screen plate along the shape and contour of the extrusion block, and is squeezed off by the rotation of the inclined second scraper, thereby making the resulting benzotriazole particles uniform in size. The arc plate at the bottom of the filter screen plate can prevent small benzotriazole particles from splashing after grinding.
[0018] A further improvement of this utility model is that: the bottom of the filter screen plate is fixedly connected with a plurality of support rods arranged in a circular array, and the outer wall of each support rod is fitted with a spring, and the support rods and the grinding cylinder are slidably connected.
[0019] The above technical solution includes a support rod and a spring at the bottom of the filter screen plate, which allows the filter screen plate to float up and down during the grinding process, making it easier for the benzotriazole on the surface of the filter screen plate to fall off.
[0020] A further improvement of this utility model is that a heating ring is fixedly connected to the side of the fixed top cover near the grinding cylinder, and the heating ring is electrically connected to an external power supply module through a conductive terminal.
[0021] The above technical solution connects the heating ring to an external power module, allowing for pre-drying before grinding, thus improving grinding efficiency.
[0022] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:
[0023] 1. This utility model provides a grinding mechanism for benzotriazole production. A spirally arranged pipe is fixed to the outer wall of the grinding cylinder. Cooling water is pumped into the pipe via an external water pump. The spiral flow channel design of the pipe extends the flow path of the cooling water on the surface of the grinding cylinder, increasing the heat exchange area and ensuring uniform temperature distribution within the cavity. This also ensures that the benzotriazole particles are uniformly broken down by the grinding components, reducing agglomeration. By adjusting the cooling water flow rate and temperature, the surface temperature of the grinding cylinder is stabilized, preventing thermal damage to the material. Compared to traditional air cooling, the water-cooled jacket can operate continuously, maintaining the material's brittleness in a low-temperature environment and improving grinding efficiency. The cooling water inside the pipe lowers the temperature without contacting the internal benzotriazole, ensuring the purity of the benzotriazole and further improving the grinding quality.
[0024] 2. This utility model provides a grinding mechanism for the production of benzotriazole. The mechanism uses an inverted conical inclined plate. When benzotriazole is placed within this plate, it gradually converges towards the bottom of the plate due to its inclination. It is important to note that a filter screen is located at the bottom of the inclined plate, and the grinding ring abuts against it. When the receiving rod rotates under the action of the transmission box, friction occurs between the grinding ring and the filter screen, thus crushing the benzotriazole. A first scraper on the outside of the grinding ring is in contact with the inclined plate and is used to scrape off the benzotriazole adhering to the surface of the inclined plate. The conical block has an inclined surface. When benzotriazole is ground and falls from the filter screen, it slides down the shape and contour of the conical block to the joint between the extrusion block and the conical block. Since the conical block and the receiving rod are an integral structure, the conical block rotates during the grinding process and rubs against the extrusion plate inside the extrusion plate, thus performing a secondary grinding process on the benzotriazole. It then falls through the inclined surface at the bottom of the extrusion block without needing to be removed for secondary grinding, reducing the possibility of it coming into contact with external substances, improving the continuity of grinding, and speeding up the grinding process. Attached Figure Description
[0025] The present invention will be further described below with reference to the accompanying drawings.
[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0027] Figure 2 This is a three-dimensional structural diagram of the grinding cylinder and the pipe in this utility model;
[0028] Figure 3 This is a three-dimensional structural diagram of the matching limit ring and the pipeline in this utility model;
[0029] Figure 4 This is a cross-sectional three-dimensional structural diagram of the grinding cylinder in this utility model;
[0030] Figure 5 This is a three-dimensional structural diagram of the conical block and the extrusion block in this utility model.
[0031] Figure 6 This is a three-dimensional structural diagram of the fixed top cover and heating ring in this utility model.
[0032] In the diagram: 1. Main body of the device; 2. Transmission box; 3. Fixed top cover; 4. Grinding cylinder; 5. Limiting ring; 6. Inclined plate; 7. Supporting rod; 8. First scraper; 9. Pipe; 10. Arc plate; 11. Support rod; 12. Spring; 13. Filter screen plate; 14. Extrusion block; 15. Conical block; 16. Grinding ring; 17. Extrusion plate; 18. Second scraper; 19. Connecting base; 20. Heating ring. Detailed Implementation
[0033] The present invention will be further described in detail below with reference to the embodiments.
[0034] Example 1
[0035] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a grinding mechanism for the production of benzotriazole, including a device body 1; a transmission box 2 is fixedly connected to the top of the device body 1, a fixed top cover 3 is fixedly connected to the bottom of the transmission box 2, a grinding assembly is provided inside the device body 1, the grinding assembly includes a grinding cylinder 4 fixedly connected inside the device body 1, a limiting ring 5 is fixedly connected to the outer wall of the grinding cylinder 4, a pipe 9 is fixedly connected to the middle position of the limiting ring 5, the pipe 9 is spirally arranged, and the limiting ring 5 is connected to an external water pump.
[0036] In this embodiment, a spiral pipe 9 is fixed to the outer wall of the grinding cylinder 4. Cooling water is pumped into the pipe 9 by an external water pump. The spiral flow channel design of the pipe 9 extends the flow path of the cooling water on the surface of the grinding cylinder 4, increases the heat exchange area, and makes the temperature distribution in the cavity uniform. At the same time, it ensures that the benzotriazole particles are uniformly broken down under the action of the grinding components, reducing agglomeration. Specifically, by adjusting the flow rate and temperature of the cooling water, the surface temperature of the grinding cylinder 4 is stabilized to avoid thermal damage to the material. Compared with traditional air cooling, the water-cooled jacket can operate continuously, and the low-temperature environment maintains the brittleness of the material and improves the grinding efficiency. The cooling water inside the pipe 9 lowers the temperature without contacting the internal benzotriazole, ensuring the purity of the benzotriazole and further improving the grinding quality.
[0037] Example 2
[0038] like Figure 2 , Figure 4 and Figure 5As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, an inclined plate 6 is fixedly connected to the inner wall of the grinding cylinder 4. The inclined plate 6 is inverted conical shape. A connecting base 19 is fixedly connected to the bottom of the fixed top cover 3. A receiving rod 7 is fixedly connected to the inner wall of the connecting base 19. A grinding ring 16 is fixedly connected to the outer wall of the receiving rod 7. A first scraper 8 is fixedly connected to the outer wall of the grinding ring 16. The first scraper 8 and the inclined plate 6 are in contact. The grinding ring 16 and the inclined plate 6 are slidably connected at the middle position. A filter screen is provided at the middle position of the inclined plate 6.
[0039] Because benzotriazole may be insufficiently ground during the grinding process, the particle size of benzotriazole after grinding is uneven, which affects the effect of use.
[0040] In this embodiment, the inclined plate 6 is set in an inverted cone shape. When benzotriazole is placed in it, it will gradually converge towards the bottom of the inclined plate 6 with the inclination arc of the inclined plate 6. It should be noted that a filter screen is provided at the bottom of the inclined plate 6, and the grinding ring 16 is in contact with it. When the receiving rod 7 starts to rotate under the action of the transmission box 2, friction is generated between the grinding ring 16 and the filter screen, thereby crushing the benzotriazole. The first scraper 8 outside the grinding ring 16 is in contact with the inclined plate 6 and is used to scrape off the benzotriazole adhering to the surface of the inclined plate 6.
[0041] like Figure 4 and Figure 5 As shown, preferably, a conical block 15 is fixedly connected to the outer wall of the receiving rod 7, the top of the conical block 15 is inclined, an extrusion block 14 is fixedly connected to the inner wall of the grinding cylinder 4, an extrusion sheet 17 is fixedly connected to the inner side wall of the extrusion block 14, the extrusion sheet 17 is elastically set, the extrusion sheet 17 and the outer wall of the conical block 15 are in contact, and the bottom of the extrusion block 14 is inclined.
[0042] Benzotriazole still exhibits uneven particle size after a single grinding process. Currently, the most common solution is to remove the larger particles and grind them a second time. However, this not only reduces work efficiency but also causes other substances to adhere to the surface of the benzotriazole during the removal process, leading to a decrease in purity.
[0043] In this embodiment, the surface of the conical block 15 is set at an angle. When the benzotriazole is ground and falls from the filter screen, it will slide down to the contact point between the extrusion block 14 and the conical block 15 according to the shape and contour of the surface of the conical block 15. Since the conical block 15 and the receiving rod 7 are an integral structure, the conical block 15 rotates during the grinding process and rubs against the extrusion plate 17 on the inner side of the extrusion plate 17, thereby performing a secondary grinding process on the benzotriazole. It then falls through the angled bottom of the extrusion block 14 without needing to be removed for secondary grinding, reducing the possibility of it coming into contact with external substances, improving the continuity of grinding, and speeding up the grinding progress.
[0044] like Figure 4 and Figure 5 As shown, preferably, a filter screen plate 13 is slidably connected to the bottom of the grinding cylinder 4, and an arc plate 10 is fixedly connected to the bottom of the filter screen plate 13. The arc plate 10 is arranged in an inwardly bent arc shape. A second scraper 18 is fixedly connected to the outer wall of the receiving rod 7. The second scraper 18 is arranged at an inclination and is in contact with the filter screen plate 13.
[0045] In this embodiment, after secondary grinding, benzotriazole falls onto the filter screen plate 13 following the shape and contour of the extrusion block 14, and is squeezed off by the rotating second scraper 18, which is set at an inclination. This makes the resulting benzotriazole particles uniform in size. The arc plate 10 set at the bottom of the filter screen plate 13 can prevent small benzotriazole particles from splashing after grinding.
[0046] like Figure 4 As shown, preferably, the bottom of the filter screen plate 13 is fixedly connected with a plurality of support rods 11 arranged in a circular array, and the outer wall of each support rod 11 is fitted with a spring 12. The support rods 11 and the grinding cylinder 4 are slidably connected.
[0047] In this embodiment, a support rod 11 and a spring 12 are provided at the bottom of the filter screen plate 13, so that the filter screen plate 13 can float up and down during the grinding process, thereby making it easier for the benzotriazole on the surface of the filter screen plate 13 to fall off.
[0048] Example 3
[0049] like Figure 4 and Figure 5 As shown, based on Embodiment 1, this utility model provides a technical solution: preferably, a heating ring 20 is fixedly connected to the side of the fixed top cover 3 near the grinding cylinder 4, and the heating ring 20 is electrically connected to an external power supply module through a conductive terminal.
[0050] Because the moisture inside benzotriazole may cause partial hydrolysis, especially at high temperatures, it generates byproducts such as benzotriazole ring-opening derivatives, which affect corrosion inhibition performance or ultraviolet absorption efficiency, resulting in poor subsequent performance.
[0051] In this embodiment, the heating ring 20 is connected to an external power module, so the heating ring 20 can be used to pre-dry the material before grinding, thereby improving the grinding efficiency.
[0052] The working principle of the grinding mechanism used in the production of benzotriazole is explained in detail below.
[0053] like Figures 1-6As shown, during use, benzotriazole is first placed inside the grinding cylinder 4. At this time, benzotriazole accumulates on the surface of the inclined plate 6 and is pre-dried by the heating ring 20. The inclined plate 6 is set in an inverted cone shape. When benzotriazole is placed inside, it will gradually converge towards the bottom of the inclined plate 6 with the inclination arc of the inclined plate 6. It should be noted that a filter screen is provided at the bottom of the inclined plate 6, and the grinding ring 16 abuts against it. When the receiving rod 7 starts to rotate under the action of the transmission box 2, friction is generated between the grinding ring 16 and the filter screen, thereby crushing the benzotriazole. The first scraper 8 outside the grinding ring 16 is in contact with the inclined plate 6 and is used to scrape off the benzotriazole adhering to the surface of the inclined plate 6. When the benzotriazole is ground and falls from the filter screen, it will slide down the shape contour of the conical block 15 to the joint between the extrusion block 14 and the conical block 15. Since the conical block 15 and the receiving rod 7 are integrated, The structure allows the conical block 15 to rotate and rub against the inner side of the extrusion plate 17 during the grinding process, thus performing a secondary grinding treatment on the benzotriazole. The benzotriazole then falls off through the inclined surface at the bottom of the extrusion block 14, eliminating the need for secondary grinding and reducing the possibility of it coming into contact with external substances. After secondary grinding, the benzotriazole falls onto the filter screen plate 13 following the shape and contour of the extrusion block 14, and is then squeezed off by the rotating second scraper 18, which is set at an inclination. This results in uniform benzotriazole particle size. The arc-shaped plate 10 at the bottom of the filter screen plate 13 can prevent small benzotriazole particles from splashing after grinding. The bottom of the filter screen plate 13 is equipped with a support rod 11 and a spring 12, which allows the filter screen plate 13 to float up and down during the grinding process, making it easier for the benzotriazole on the surface of the filter screen plate 13 to fall off.
[0054] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.
Claims
1. A grinding mechanism for the production of benzotriazole, comprising a main body (1); characterized in that: A transmission box (2) is fixedly connected to the top of the main body (1) of the device, and a fixed top cover (3) is fixedly connected to the bottom of the transmission box (2). A grinding assembly is provided inside the main body (1). The grinding assembly includes a grinding cylinder (4) fixedly connected inside the main body (1). A limiting ring (5) is fixedly connected to the outer wall of the grinding cylinder (4). A pipe (9) is fixedly connected to the middle position of the limiting ring (5). The pipe (9) is spirally arranged. The limiting ring (5) is connected to an external water pump.
2. The grinding mechanism for benzotriazole production according to claim 1, characterized in that: An inclined plate (6) is fixedly connected to the inner wall of the grinding cylinder (4). The inclined plate (6) is inverted conical. A connecting base (19) is fixedly connected to the bottom of the fixed top cover (3). A receiving rod (7) is fixedly connected to the inner wall of the connecting base (19). A grinding ring (16) is fixedly connected to the outer wall of the receiving rod (7). A first scraper (8) is fixedly connected to the outer wall of the grinding ring (16). The first scraper (8) and the inclined plate (6) are in contact. The grinding ring (16) and the inclined plate (6) are slidably connected at the middle position. A filter screen is provided at the middle position of the inclined plate (6).
3. The grinding mechanism for benzotriazole production according to claim 2, characterized in that: A conical block (15) is fixedly connected to the outer wall of the receiving rod (7). The top of the conical block (15) is set with an inclined surface. An extrusion block (14) is fixedly connected to the inner wall of the grinding cylinder (4). An extrusion sheet (17) is fixedly connected to the inner side wall of the extrusion block (14). The extrusion sheet (17) is elastically set and the extrusion sheet (17) is in contact with the outer wall of the conical block (15).
4. A grinding mechanism for benzotriazole production according to claim 3, characterized in that: The bottom of the extrusion block (14) is inclined.
5. A grinding mechanism for benzotriazole production according to claim 4, characterized in that: A filter screen plate (13) is slidably connected to the bottom of the grinding cylinder (4), and an arc plate (10) is fixedly connected to the bottom of the filter screen plate (13). The arc plate (10) is arranged in an inwardly bent arc shape. A second scraper (18) is fixedly connected to the outer wall of the receiving rod (7). The second scraper (18) is inclined and fits against the filter screen plate (13).
6. A grinding mechanism for benzotriazole production according to claim 5, characterized in that: The bottom of the filter screen plate (13) is fixedly connected to a plurality of support rods (11) arranged in a circular array. The outer wall of each support rod (11) is fitted with a spring (12). The support rod (11) and the grinding cylinder (4) are slidably connected.
7. A grinding mechanism for benzotriazole production according to claim 1, characterized in that: A heating ring (20) is fixedly connected to the side of the fixed top cover (3) near the grinding cylinder (4), and the heating ring (20) is electrically connected to an external power supply module through a conductive terminal.