A ball mill classification system for flake zinc powder production

Abstract

The application discloses a ball milling grading system for flaky zinc powder production, which comprises a negative pressure feeding Roots vacuum pump, a feeding air outlet pipeline, a feeding air outlet valve, a negative pressure feeding cloth bag dust collector, a ball mill, a discharge pipeline, a vacuum valve, an airflow grading assembly, a discharge air return pipeline, a discharge Roots vacuum pump, a feeding and discharging valve, a discharge valve, a pressure relief emptying valve, a nitrogen supplement valve and an air return valve, one end of the feeding air outlet pipeline is connected with the negative pressure feeding Roots vacuum pump, the other end is connected with the negative pressure feeding cloth bag dust collector, and the bottom is connected with the ball mill, the feeding and discharging valve is arranged at the bottom of the negative pressure feeding cloth bag dust collector, one end of the discharge pipeline is connected with the ball mill, the other end is connected with the airflow grading assembly, the vacuum valve and the discharge valve are arranged on the discharge pipeline, one end of the discharge air return pipeline is connected with the airflow grading assembly, and the other end is connected with the ball mill. Compared with the prior art, the application makes the whole production process continuous and stable, guarantees the safety of the production process, and greatly improves the product quality.

Description

Technical Field

[0001] This invention relates to the field of zinc powder production technology, and in particular to a ball milling and grading system for the production of flake zinc powder. Background Technology

[0002] Heavy-duty anti-corrosion coatings are a type of anti-corrosion coating that can be used in relatively harsh corrosive environments and has a longer protection period compared to conventional anti-corrosion coatings. Currently, most zinc-rich anti-corrosion coatings widely used in the heavy-duty anti-corrosion field use spherical zinc powder as their main component. However, due to the large gaps between particles when spherical particles are stacked, a larger coating thickness is usually required to ensure good anti-corrosion effect.

[0003] Due to its unique flaky structure, flake zinc powder forms planar overlaps between surfaces within the coating, significantly reducing the coating's porosity and effectively blocking the penetration of corrosive media and water. Furthermore, the flake structure of the coating results in better ductility during application compared to commonly used spherical zinc powder heavy-duty anti-corrosion coatings. Therefore, the filler usage is only one-third that of spherical zinc powder, while still providing superior anti-corrosion performance. This has led to its widespread application in coating technologies such as Dacromet and Diamet.

[0004] Currently, the production of flake zinc powder primarily utilizes ball milling, mainly divided into two processes: wet ball milling and dry ball milling. The wet ball milling process involves adding spherical zinc powder, grinding balls, grinding solvent, and grinding aids into a ball mill for grinding. The spherical zinc powder is ground into a flake structure, and then processed through filtration, drying, dispersion, and grading to form the finished product. This process produces products with stable quality and high zinc content, but it has a long production process and high production costs. The dry ball milling process involves adding spherical zinc powder, grinding balls, and grinding aids into a ball mill for grinding. The spherical zinc powder is then directly graded to obtain the finished product. This process has a shorter production process and significant cost advantages. However, because there is no grinding solvent for protection during the grinding process, the surface activity is high. During the ball milling system's separation and transfer to the grading system, the material is prone to severe oxidation upon contact with air, causing heat generation and even spontaneous combustion, posing a higher safety risk.

[0005] In view of this, a ball milling classification system for the production of flake zinc powder is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a ball milling and grading system for the production of flake zinc powder, which enables the entire production process to be continuous and stable, ensures the safety of the production process, and significantly improves product quality.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0008] A ball milling and classifying system for the production of flake zinc powder includes a negative pressure feeding Roots vacuum pump, a feeding and discharging air duct, a feeding and discharging air valve, a negative pressure feeding bag filter, a ball mill, a discharging pipe, a vacuum valve, an air classifying assembly, a discharging and returning air duct, a discharging Roots vacuum pump, a feeding and unloading valve, a discharging valve, a pressure relief and venting valve, a nitrogen replenishment valve, and a returning air valve. One end of the feeding and discharging air duct is connected to the negative pressure feeding Roots vacuum pump, and the other end is connected to the negative pressure feeding bag filter. The feeding and discharging air valve is located on the feeding and discharging air duct. The negative pressure feeding bag filter dust collector has a feed inlet on its side and is connected to the ball mill at its bottom. The feed and discharge valve is located at the bottom of the negative pressure feeding bag filter dust collector. One end of the discharge pipe is connected to the ball mill, and the other end is connected to the air classifier assembly. The vacuum valve and the discharge valve are located on the discharge pipe. One end of the discharge return air pipe is connected to the air classifier assembly, and the other end is connected to the ball mill. The discharge Roots vacuum pump, pressure relief valve, return air valve, and nitrogen replenishment valve are sequentially located on the discharge return air pipe.

[0009] In a preferred embodiment, the airflow classification assembly includes a primary classification unit, a secondary classification unit, and a discharge bag filter. The primary and secondary classification units are equipped with impeller motors and classification impellers. The primary classification unit is equipped with a primary finished product discharge valve, the secondary classification unit is equipped with a secondary finished product discharge valve, and the discharge bag filter is equipped with a tertiary finished product discharge valve. The discharge return air duct is connected to the discharge bag filter, and the discharge duct is connected to the primary classification unit.

[0010] In a preferred embodiment, a first pressure sensor is provided between the secondary grading host and the discharge bag dust collector.

[0011] In a preferred embodiment, a second pressure sensor is provided on the discharge return air duct, and the second pressure sensor is located between the discharge bag dust collector and the discharge Roots vacuum pump.

[0012] In a preferred embodiment, one end of the ball mill is provided with a first cooling water flow regulating valve and an infrared temperature sensor.

[0013] In a preferred embodiment, the discharge return air duct is provided with a duct cooling heat exchanger, and the duct cooling heat exchanger is provided with a second cooling water flow regulating valve.

[0014] In a preferred embodiment, the discharge return air duct is equipped with a temperature sensor and an oxygen concentration sensor.

[0015] In a preferred embodiment, one end of the ball mill is provided with a feed pipe, and the discharge return air pipe is connected to the feed pipe. The feed pipe includes a pipe body, a sleeve, a driving electromagnet, a moving ring, and multiple movable rods. The pipe body is provided with a sleeve section, the driving electromagnet is located at the end of the sleeve section, the moving ring is sleeved on the sleeve section, and the moving ring is made of magnet. One end of each movable rod is connected to the moving ring, and multiple movable rods are evenly distributed around the circumference of the sleeve section. Each movable rod is provided with a prestressed bending part, so that the movable rod bends under non-external force. The sleeve is sleeved on the sleeve section, and there is a movable cavity between the sleeve and the sleeve section for the moving ring to move. The sleeve is provided with multiple through holes for the multiple movable rods to pass through.

[0016] In a preferred embodiment, a pressure strain gauge is provided in the through hole.

[0017] In a preferred embodiment, an even number of driving electromagnets are provided, and the even number of driving electromagnets are evenly arranged around the socket section.

[0018] Compared with existing technologies, the ball milling and classification system for producing flake zinc powder of the present invention operates as follows: The first step in the ball milling and classification system for producing flake zinc powder is the feeding stage. A negative pressure feeding Roots vacuum pump operates, drawing in the spherical zinc powder raw material and grinding aids, which are then transported through the feeding outlet duct. During this process, the feeding outlet valve controls the airflow direction. After the material reaches the negative pressure feeding bag filter, gas-solid separation occurs through the filter bags. The raw material and aids enter the negative pressure feeding bag filter through the inlet and then enter the ball mill under gravity. The feeding and discharging valve controls the flow rate of the material entering the ball mill.

[0019] After feeding is complete, close the ball mill feed inlet, then open the vacuum valve to extract air from the system using the vacuum system. Next, open the nitrogen replenishment valve to introduce nitrogen. Repeat this process several times until the system pressure and oxygen concentration reach the predetermined target values. Then start the ball mill, with grinding balls of a specific size and proportion pre-placed inside, to begin grinding the material.

[0020] After grinding is complete, open the nitrogen injection valve and inject nitrogen gas with a purity of 90%-99.9%. Adjust the ball mill speed to low and perform surface passivation treatment on the flake zinc powder under a trace oxygen atmosphere. Passivation treatment aims to improve the performance of the flake zinc powder, making it more stable during subsequent storage and use, and less prone to adverse chemical reactions such as oxidation. After passivation treatment, the oxidation resistance of the flake zinc powder is significantly enhanced.

[0021] After passivation, the discharge valve, return air valve, and vacuum valve are opened, and the gas is extracted again using the vacuum system. Then, high-purity nitrogen is introduced through the nitrogen replenishment valve, repeating this process multiple times until the system pressure and oxygen concentration meet the requirements. Subsequently, the air classifier and the discharge Roots vacuum pump are started. At this point, the flake zinc powder in the ball mill is carried out by the airflow and enters the air classifier. In the air classifier, the flake zinc powder is classified into different grades of finished products according to particle size. Each grade of finished product is released to the automatic vacuum packaging machine through alternating top and bottom discharge (airlock discharge) to complete the packaging. The dust-laden airflow, after passing through the bag filter gas-solid separation, returns to the ball mill via the discharge return air pipe and the discharge Roots vacuum pump, forming a cycle until all material in the ball mill has been discharged. Thanks to the precise classification function of the air classifier, the produced flake zinc powder of different particle size grades has high purity.

[0022] During the entire system operation, when the system pressure exceeds the set value, the pressure relief valve opens to reduce the pressure, and closes once the pressure returns to below the target value. If the system oxygen concentration exceeds the standard, the nitrogen replenishment valve will automatically open to replenish nitrogen until the oxygen concentration is below the target value. This automatic monitoring and regulation mechanism ensures that the system operating environment is always in a safe and stable state, greatly reducing the risk of safety accidents caused by pressure fluctuations or changes in oxygen concentration, and enabling the production process to proceed safely, continuously, and stably.

[0023] This ball milling and grading system organically combines a traditional ball mill and an air classifier system, supplemented by a passivation treatment function, greatly optimizing the production process. The originally complex and lengthy production procedures are simplified, effectively reducing production costs. Regarding safety and reliability, all actions and interlocks during the overall system operation, except for closing the ball mill feed inlet, are automatically controlled by a PLC program. This automated control method ensures precise connection and stable operation of each link, avoiding errors and uncertainties that may be caused by human operation. From a product quality perspective, precise process control and passivation treatment functions result in more accurate particle size classification, significantly improving the quality of flake zinc powder. This better meets the market demand for high-quality flake zinc powder, enhancing the product's market competitiveness and providing strong technical support for the efficient and safe production of flake zinc powder. In terms of production efficiency, due to the close connection and high degree of automation of each link, the entire production cycle is significantly shortened, and the output per unit time is significantly increased, further improving the company's production efficiency. Attached Figure Description

[0024] Figure 1 This invention relates to a schematic diagram of a ball milling and grading system for the production of flake zinc powder.

[0025] Figure 2This invention relates to a schematic diagram of the feed pipe of a ball milling and grading system for the production of flake zinc powder (with the movable rod not extended).

[0026] Figure 3 This invention relates to a schematic diagram of the structure of a ball mill classification system for the production of flake zinc powder, with the sleeve omitted (the movable rod is not extended).

[0027] Figure 4 This invention relates to a schematic diagram of the feed pipe of a ball mill classification system for the production of flake zinc powder (with the movable rod extended).

[0028] Figure 5 This invention relates to a schematic diagram of the structure of a ball mill classification system for the production of flake zinc powder, with the sleeve omitted (movable rod extended).

[0029] Figure 6 This invention relates to a schematic diagram of the structure of a movable rod in a ball milling and grading system for the production of flake zinc powder.

[0030] In the picture

[0031] 1. Negative pressure feeding Roots vacuum pump; 2. Feeding outlet air duct; 3. Feeding outlet air valve; 4. Negative pressure feeding bag dust collector; 5. Feed inlet; 6. Ball mill; 7. First cooling water flow regulating valve; 8. Infrared temperature sensor; 9. Discharge pipe; 10. Vacuum valve; 11. First stage classifier; 12. First stage finished product discharge valve; 13. Second stage classifier; 14. Second stage finished product discharge valve; 15. Discharge bag dust collector; 16. Tertiary stage finished product discharge valve; 17. Discharge return air duct; 18. Discharge Roots vacuum pump; 19. Feeding and discharging valve; 20. Discharge valve; 21. Pressure relief and venting valve; 22. Nitrogen replenishment valve; 23. Return air valve; 24. First pressure sensor; 25. Second pressure sensor; 26. Pipe cooling heat exchanger; 27. Second cooling water flow regulating valve; 28. Temperature sensor; 29. ​​Oxygen concentration sensor; 30. Feed pipe; 31. Pipe body; 32. Sleeve; 33. Through hole; 34. Pressure strain gauge; 35. Drive electromagnet; 36. Moving ring; 37. Movable rod; 38. Prestressed bending part; 39. Impeller motor; 40. Stage impeller; 41. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0034] like Figures 1 to 6As shown, a ball milling and classifying system for the production of flake zinc powder includes a negative pressure feeding Roots vacuum pump 1, a feeding and outlet air duct 2, a feeding and outlet air valve 3, a negative pressure feeding bag filter dust collector 4, a ball mill 6, an outlet air duct 9, a vacuum valve 10, an air classifying assembly, an outlet return air duct 17, an outlet Roots vacuum pump 18, a feeding and unloading valve 19, an outlet valve 20, a pressure relief and venting valve 21, a nitrogen replenishment valve 22, and a return air valve 23. One end of the feeding and outlet air duct 2 is connected to the negative pressure feeding Roots vacuum pump 1, and the other end is connected to the negative pressure feeding bag filter dust collector 4. The feeding and outlet air valve 3 is located on the feeding and outlet air duct 2. The negative pressure feeding bag filter 4 has a feed inlet 5 on its side and is connected to the ball mill 6 at its bottom. The feed and discharge valve 19 is located at the bottom of the negative pressure feeding bag filter 4. One end of the discharge pipe 9 is connected to the ball mill 6 and the other end is connected to the air classifier assembly. The vacuum valve 10 and the discharge valve 20 are located on the discharge pipe 9. One end of the discharge return air pipe 17 is connected to the air classifier assembly and the other end is connected to the ball mill 6. The discharge Roots vacuum pump 18, the pressure relief and venting valve 21, the return air valve 23, and the nitrogen replenishment valve 22 are sequentially located on the discharge return air pipe 17.

[0035] In this embodiment, a ball milling and grading system for producing flake zinc powder operates as follows: The first step is the feeding stage. A negative pressure feeding Roots vacuum pump 1 operates, drawing in the spherical zinc powder raw material and grinding aids, which are then transported through the feeding outlet duct 2. During this process, the feeding outlet valve 3 controls the airflow direction. After the material reaches the negative pressure feeding bag filter 4, gas-solid separation occurs through the filter bags. The raw material and aids enter the negative pressure feeding bag filter 4 through the inlet 5 and then enter the ball mill 6 under gravity. The feeding and unloading valve 19 controls the flow rate of the material entering the ball mill 6.

[0036] After feeding is complete, close the feed inlet of ball mill 6, then open vacuum valve 10 to extract air from the system using the vacuum system. Next, open nitrogen supply valve 22 to introduce nitrogen. Repeat this process several times until the system pressure and oxygen concentration reach the predetermined target values. Then start ball mill 6, with grinding balls of a specific size and proportion pre-placed inside, to begin grinding the material.

[0037] After grinding is complete, open nitrogen injection valve 22 to inject nitrogen gas with a purity of 90%-99.9%, and adjust the ball mill speed 6 to low speed to perform surface passivation treatment on the flake zinc powder under a trace oxygen concentration atmosphere. Passivation treatment aims to improve the performance of the flake zinc powder, making it more stable during subsequent storage and use, and less prone to adverse chemical reactions such as oxidation. After passivation treatment, the oxidation resistance of the flake zinc powder is significantly enhanced.

[0038] After passivation, the discharge valve 20, return air valve 23, and vacuum valve 10 are opened to extract the gas again using the vacuum system. Then, high-purity nitrogen is introduced through the nitrogen replenishment valve 22, repeating this process multiple times until the system pressure and oxygen concentration meet the requirements. Subsequently, the airflow classification component and the discharge Roots vacuum pump 18 are started. At this point, the flake zinc powder in the ball mill 6 is carried out by the airflow and enters the airflow classification component. In the airflow classification component, the flake zinc powder is classified into different grades of finished products according to particle size. Each grade of finished product is released to the automatic vacuum packaging machine through alternating top and bottom discharge (airlock discharge) to complete the finished product packaging. The dust-laden airflow, after passing through the bag filter gas-solid separation, returns to the ball mill 6 via the discharge return air pipe 17 and the discharge Roots vacuum pump 18, forming a cycle until all material in the ball mill 6 has been discharged. Thanks to the precise classification function of the airflow classification component, the produced flake zinc powder of different particle size grades has high purity.

[0039] During the entire system operation, when the system pressure exceeds the set value, the pressure relief valve 21 opens to reduce the pressure, and closes once the pressure returns to below the target value. If the system oxygen concentration exceeds the standard, the nitrogen replenishment valve 22 will automatically open to replenish nitrogen until the oxygen concentration is below the target value. This automatic monitoring and regulation mechanism ensures that the system operating environment is always in a safe and stable state, greatly reducing the risk of safety accidents caused by pressure fluctuations or changes in oxygen concentration, and enabling the production process to proceed safely, continuously, and stably.

[0040] This ball milling and grading system organically combines a traditional ball mill (6) with an air classifier system, supplemented by a passivation treatment function, greatly optimizing the production process. The originally complex and lengthy production procedures are simplified, effectively reducing production costs. Regarding safety and reliability, all actions and interlocks during the overall system operation, except for closing the feed inlet of the ball mill (6), are automatically controlled by a PLC program. This automated control method ensures precise connection and stable operation of each link, avoiding errors and uncertainties that may arise from human operation. From a product quality perspective, precise process control and passivation treatment functions result in more accurate particle size classification, significantly improving the quality of flake zinc powder. This better meets market demand for high-quality flake zinc powder, enhancing the product's market competitiveness and providing strong technical support for the efficient and safe production of flake zinc powder. In terms of production efficiency, due to the close connection and high degree of automation of each link, the entire production cycle is significantly shortened, and the output per unit time is significantly increased, further improving the company's production efficiency.

[0041] The airflow classification assembly includes a primary classification unit 11, a secondary classification unit 13, and a discharge bag filter dust collector 15. The primary classification unit 11 and the secondary classification unit 13 are equipped with impeller motors 40 and classification impellers 41. The primary classification unit 11 has a primary finished product discharge valve 12 below it, the secondary classification unit 13 has a secondary finished product discharge valve 14 below it, and the discharge bag filter dust collector 15 has a tertiary finished product discharge valve 16 below it. The discharge return air duct 17 connects to the discharge bag filter dust collector 15, and the discharge duct 9 connects to the primary classification unit 11. The impeller motors 40 and classification impellers 41 on the primary and secondary classification units 11 work in concert to accurately screen and classify the zinc powder according to its particle size. During operation, the flaky zinc powder in the ball mill 6 enters the primary classifier 11 through the discharge pipe 9. Under the action of the specific airflow generated by the impeller motor 40 driving the classifier impeller 41 to rotate, the larger flaky zinc powder particles are separated first and discharged and collected through the primary finished product discharge valve 12, completing the primary particle size screening. Next, the remaining zinc powder enters the secondary classifier 13, where the particle size is further subdivided through a similar principle. Zinc powder that meets the corresponding standards is collected through the secondary finished product discharge valve 14. The dust-laden airflow remaining after the two-stage classification enters the discharge bag filter 15. Through the gas-solid separation effect of the filter bag, the clean gas returns to the ball mill 6 through the discharge return air pipe 17 for continued recycling. The separated finer flaky zinc powder particles are collected through the tertiary finished product discharge valve 16, ultimately achieving precise classification of flaky zinc powder into finished products of different particle sizes.

[0042] Furthermore, a first pressure sensor 24 is installed between the secondary classifier 13 and the discharge bag filter 15, and a second pressure sensor 25 is installed on the discharge return air duct 17. The second pressure sensor 25 is located between the discharge bag filter 15 and the discharge Roots vacuum pump 18. The first pressure sensor 24, located between the secondary classifier 13 and the discharge bag filter 15, can monitor the air pressure in this link in real time, ensuring normal zinc powder transmission and gas-solid separation. The second pressure sensor 25, on the discharge return air duct 17, can monitor the gas circulation pressure and provide timely feedback in case of abnormalities, allowing the system to adjust accordingly.

[0043] One end of the ball mill 6 is equipped with a first cooling water flow regulating valve 7 and an infrared temperature sensor 288. During grinding, the ball mill 6 generates heat due to friction. The infrared temperature sensor 288 accurately monitors the temperature change of the ball mill 6. Once the temperature deviates from the target range, it transmits a signal to the control system. At this time, the first cooling water flow regulating valve 7, according to the instruction, controls the cooling water flow by adjusting its opening degree, so that the temperature of the ball mill 6 remains stable within the appropriate target range. This not only ensures the normal progress of the internal chemical reaction and physical grinding of the ball mill 6, avoiding problems such as raw material denaturation and equipment damage caused by high temperature, but also guarantees the production quality of the flake zinc powder and the continuity of the production process.

[0044] The discharge return air duct 17 is equipped with a duct cooling heat exchanger 26, and the duct cooling heat exchanger 26 is equipped with a second cooling water flow regulating valve 27. During the circulation process, the gas in the discharge return air duct 17 carries heat. If this heat accumulates, it may affect the stable operation of the entire system and the quality of the flake zinc powder. The duct cooling heat exchanger 26 can cool the passing hot airflow, while the second cooling water flow regulating valve 27, by adjusting its opening, can precisely control the flow rate of cooling water entering and exiting the duct cooling heat exchanger 26, thereby achieving fine-tuning of the heat exchanger's cooling effect.

[0045] The discharge return air duct 17 is equipped with a temperature sensor 28 and an oxygen concentration sensor 29. The temperature sensor 28 can sense the system temperature in real time, and if the temperature is abnormal, it can be stabilized by adjusting the cooling water regulating valve. The oxygen concentration sensor 29 can accurately monitor the oxygen concentration, and can trigger a nitrogen supplementation operation in time when the oxygen concentration exceeds the standard. Together, they ensure the safe and stable operation of the system.

[0046] One end of the ball mill 6 is provided with a feed pipe 30, and the discharge return air pipe 17 is connected to the feed pipe 30. The feed pipe 30 includes a pipe body 31, a sleeve 33, a driving electromagnet 36, a moving ring 37, and multiple movable rods 38. The pipe body 31 is provided with a sleeve section 32. The driving electromagnet 36 is located at the end of the sleeve section 32. The moving ring 37 is sleeved on the sleeve section 32 and is made of magnet. One end of the movable rod 38 is connected to the moving ring 37. Multiple movable rods 38 are evenly distributed around the circumference of the sleeve section 32. The movable rod 38 is provided with a prestressed bending part 39 so that the movable rod 38 bends under non-external force. The sleeve 33 is sleeved on the sleeve section 32. There is a movable cavity between the sleeve 33 and the sleeve section 32 for the moving ring 37 to move. The sleeve 33 is provided with multiple through holes 34 for the multiple movable rods 38 to pass through. During passivation, the driving electromagnet 36 acts on the moving ring 37 made of magnets, causing it to move axially along the sleeve section 32. When the moving ring 37 moves outward, it drives the movable rod 38 to extend. Due to the prestressed bending part 39, the movable rod 38 forms a closed space. When oxygen and nitrogen pass through this space, they are cut and dispersed by multiple movable rods 38, allowing for thorough mixing and uniform oxygen distribution. This effectively improves the uniformity of the passivation effect, making the passivation treatment of the flake zinc powder surface more consistent and ensuring product quality stability. When the moving ring 37 moves in the opposite direction, the movable rod 38 is straightened and fully retracted into the through hole 34 of the sleeve 33 under the guidance of the through hole 34, avoiding obstruction or interference to the airflow in the pipeline and ensuring smooth airflow throughout the entire production system at different stages.

[0047] A pressure strain gauge 35 is installed in the through hole 34. During the passivation process, when the driving electromagnet 36 controls the movement of the moving ring 37, causing the movable rod 38 to extend, multiple movable rods 38 form a closed space through their bending portions. This space serves to support the zinc powder. The pressure strain gauge 35 located in the through hole 34 can sensitively sense the supporting force. Before passivation is complete, as passivation continues, the weight characteristics supported by the movable rod 38 are dynamically changing each time it extends to support the zinc powder due to the constantly changing state of the zinc powder. Once the passivation process is complete, the relevant properties of the zinc powder tend to stabilize, and the weight characteristics supported by the extended movable rod 38 will then exhibit a stable state. This design provides a reliable basis for judging the degree of passivation. Previously, judging whether passivation was complete often lacked a precise and intuitive method. However, by using the pressure strain gauge 35 to monitor the changes in weight characteristics, operators can clearly and accurately know the progress of passivation.

[0048] An even number of driving electromagnets 36 are provided, and the even number of driving electromagnets 36 are evenly arranged around the circumference of the socket section 32. By setting half of the electromagnets to one polarity and the other half to the opposite polarity, the pushing and pulling action of the moving ring 37 can be effectively realized. When the moving ring 37 needs to move outward, the electromagnet of the specific polarity is energized to generate a magnetic field, which interacts with the magnetism of the moving ring 37 to generate an outward pushing force; while when the moving ring 37 needs to move inward, the electromagnet of the other polarity is energized to generate a pulling force in the opposite direction, thereby precisely controlling the axial movement of the moving ring 37 on the socket section 32.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0050] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be easily made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A ball milling classification system for flake zinc powder production, characterized by, The ball mill is provided with a first cooling water flow adjusting valve and an infrared temperature sensor at one end.

2. A ball milling and classifying system for the production of flaky zinc powder according to claim 1, characterized in that, A pipeline cooling heat exchanger is arranged on the air return pipeline.

3. A ball milling and classifying system for the production of flaky zinc powder according to claim 2, characterized in that, A temperature sensor and an oxygen concentration sensor are arranged on the air return pipeline.

4. A ball milling and classifying system for the production of flaky zinc powder as claimed in claim 2, wherein, A pressure strain gauge is arranged in the through hole.

5. A ball milling and classifying system for the production of flaky zinc powder as claimed in claim 1, wherein, The driving electromagnet is provided with an even number of driving electromagnets which are evenly distributed around the sleeve joint section.

6. A ball milling and classifying system for the production of flaky zinc powder according to claim 1, characterized in that, ​ 7. A ball milling and classifying system for the production of flaky zinc powder according to claim 1, characterized in that, ​ 8. A ball milling and classifying system for the production of flaky zinc powder according to claim 1, characterized in that, ​ 9. A ball milling and classifying system for the production of flaky zinc powder according to claim 1, characterized in that, ​

Images