A semi-industrialized vertical mill with anti-rust steel balls

Abstract

This invention discloses a semi-industrial vertical mill for preventing steel balls from rusting, relating to the field of ore stirring and grinding technology. It includes a machine body, an electric telescopic rod for driving the stirring mechanism up and down, and a tilting motor for tilting the grinding drum. The stirring mechanism is equipped with a drum cover and also includes a rust-prevention unit. The rust-prevention unit directly separates nitrogen from the air and adds it to the grinding drum using a downward air displacement method, sealing the nitrogen within the drum. This effectively prevents oxygen from participating in the oxidation reaction of the steel balls, allowing for oxygen-free storage and preventing rusting. Simultaneously, a semiconductor cooling chip cools the air entering the copper tube, increasing the paramagnetism of oxygen and facilitating the separation of oxygen from the flowing air by the magnet. Furthermore, condensation liquefies the vapor in the air entering the copper tube into water droplets, removing moisture and dissolved oxygen from the air, further enhancing the rust prevention effect on the steel balls.

Description

Technical Field

[0001] This invention relates to the field of ore mixing and grinding technology, and in particular to a semi-industrial vertical mill for preventing steel balls from rusting. Background Technology

[0002] As my country's consumption of non-ferrous metals continues to increase, the number of easily grindable and easily sorted metal deposits is gradually decreasing. In many newly discovered non-ferrous resource deposits, the particle size characteristics of the valuable metals are complex and varied. In actual production, different grinding equipment and processes are often required for materials at different work sites to achieve ore liberation in order to improve the grade and recovery rate of different mineral products.

[0003] Vertical roller mills are key pieces of equipment used to further refine the fineness of materials after crushing and grinding. They are widely used in mineral processing, building materials, and chemical industries, especially for ores with fine non-ferrous metal inclusions and copper slag produced during smelting. When applying vertical roller mills to ore mixing and grinding technology, extensive semi-industrial trials are conducted in the early stages of field application, focusing on the properties of ores from different ore outlets. In existing semi-industrial vertical roller mills, if the steel balls are not removed and stored promptly after grinding the ore, they are highly susceptible to rusting (rusting is generally caused by a combination of moisture and oxygen). The steel balls clump together and may even rust and stick to the mill's mixing shaft. Especially during semi-industrial trials, unavoidable equipment maintenance and process changes frequently occur, leading to frequent and prolonged downtime of the vertical roller mill. Without proper treatment of the steel balls, they are prone to overall corrosion within the mill, making manual removal extremely difficult and rendering the vertical roller mill unusable. Even if the rusted and clumped steel balls are separated, the extensive rust on the surface of the steel balls will still affect the fineness of subsequent grinding. Therefore, this application provides a ball mill that prevents steel balls from rusting to meet this requirement. Summary of the Invention

[0004] The purpose of this application is to provide a ball mill for preventing steel balls from rusting. A rust-prevention unit directly separates nitrogen from the air and adds it to the grinding barrel using a downward air displacement method, then seals the nitrogen within the grinding barrel. This effectively prevents oxygen from participating in the oxidation reaction of the steel balls, allowing for oxygen-free storage and preventing rusting. Simultaneously, a semiconductor cooling chip cools the air entering the copper tube, increasing the paramagnetism of oxygen and facilitating the separation of oxygen from the flowing air by the magnet. Furthermore, condensation liquefies the vapor in the air entering the copper tube into water droplets, removing moisture and dissolved oxygen from the air, further enhancing the rust prevention effect on the steel balls.

[0005] To achieve the above objectives, this application provides the following technical solution: a ball mill for preventing steel balls from rusting, comprising a machine body, an electric telescopic rod for driving the stirring mechanism to move up and down, and a flipping motor for driving the grinding barrel to flip. The stirring mechanism is rotatably provided with a barrel cover, and the barrel cover is provided with a feeding funnel. It also includes a rust-preventing unit for preventing steel balls in the grinding barrel from rusting.

[0006] The rust prevention unit includes a spirally extending copper tube, the outer wall of which is wrapped with a semiconductor cooling chip. The outlet of the copper tube is connected to the inner cavity of the grinding barrel via a connecting pipe. The outlet of the connecting pipe is located near the upper end of the grinding barrel. A seventh valve is installed on the connecting pipe. Several magnetic shields communicating with the inner cavity of the copper tube are provided on the outer wall of the copper tube. The inner cavity of each of the several magnetic shields is fixed with a magnet that conforms to the bending shape of the copper tube. Oxygen extraction pipes are provided on the parts adjacent to the several magnetic shields. The several oxygen extraction pipes are connected to a first housing with a first air extraction machine installed inside. A second housing with a second air extraction machine is installed on the outlet of the copper tube. The several magnets and the several oxygen extraction pipes are all arranged spirally upward.

[0007] The bucket lid is rotatably connected to the stirring shaft of the stirring mechanism via a bearing, and a first elastic sealing ring that contacts and seals with the bucket lid is fixedly sleeved on the stirring shaft. A second elastic sealing ring that contacts and seals with the upper end of the grinding bucket is fixedly connected to the lower end of the bucket lid.

[0008] The feeding funnel is equipped with a first valve, the bottom of the grinding barrel is equipped with an exhaust pipe, and a sixth valve is installed on the exhaust pipe.

[0009] Preferably, the inner cavity of the copper tube is provided with a plurality of baffles at an incline, the plurality of baffles are arranged spirally upward, and the plurality of baffles correspond one-to-one with the plurality of oxygen extraction pipes, and are respectively set at the air inlet of the corresponding oxygen extraction pipe.

[0010] Preferably, the angle of inclination of the several wind deflectors arranged in a spiral upward direction with respect to the horizontal direction gradually decreases from bottom to top.

[0011] Preferably, the first air pump is located below the plurality of oxygen extraction pipes, and the outlet ends of the plurality of oxygen extraction pipes arranged from top to bottom are spirally arranged from bottom to top on the outer wall of the first housing.

[0012] Preferably, the outlet end of the copper tube passes through the grinding barrel and is connected to the inlet end of the spiral and upward-extending cooling channel provided in the inner cavity of the grinding barrel. The outlet end of the cooling channel is connected to the circulation pipe, and the lower end of the circulation pipe is connected to the copper tube. The connection point is close to the inlet end of the copper tube. A second valve, a fourth valve, a third valve, and a fifth valve are respectively installed on the inlet end of the copper tube, the outlet end of the copper tube, the outlet end of the first housing, and the circulation pipe.

[0013] Preferably, the inlet end of the copper tube is fixedly connected to a drying device for removing moisture from the gas entering the copper tube.

[0014] Preferably, the drying device includes a third housing with a first filter screen and a feeding pipe, and a second filter screen installed inside the copper tube.

[0015] Preferably, a cooling fan is fixedly installed at the bottom of the grinding barrel.

[0016] Preferably, the inner cavity of the grinding barrel is provided with an electric heating tube that extends spirally upward.

[0017] In summary, the technical effects and advantages of this invention are as follows:

[0018] 1. The present invention has a reasonable structure. It uses a rust-prevention unit to directly separate nitrogen from the air and adds nitrogen into the grinding barrel by a downward air displacement method. After sealing the nitrogen in the grinding barrel, it can effectively prevent oxygen from participating in the oxidation reaction of the steel balls. It can preserve the steel balls in an oxygen-free environment and prevent them from rusting. Moreover, the rust-prevention unit has a simple structure and low cost. At the same time, it uses a semiconductor cooling chip to cool the air entering the copper tube, which improves the paramagnetism of oxygen. This makes it easier for the magnet to separate oxygen from the flowing air through magnetism. At the same time, through condensation, the vapor contained in the air entering the copper tube can also be liquefied into water droplets, removing moisture from the air and oxygen dissolved in the moisture, further improving the rust prevention effect on the steel balls.

[0019] 2. In this invention, several baffles are inclinedly arranged. The function of the baffles is to block and intercept the flowing oxygen and guide it into the oxygen extraction pipe. This can prevent only a very small amount of oxygen from being drawn into the oxygen extraction pipe due to the effect of motion inertia, and can effectively increase the nitrogen concentration in the gas added to the grinding barrel.

[0020] 3. In this invention, the angle of inclination of the spirally arranged baffles to the horizontal direction gradually decreases from bottom to top. Since multiple oxygen separations are required, with each oxygen extraction operation, the oxygen content in the air flowing in the copper pipe becomes lower and lower, and the thickness of the oxygen near the moving magnet becomes thinner and thinner. Therefore, setting the angle of inclination of the baffles to be smaller and smaller can reduce the contact between the baffles and nitrogen, avoid guiding it into the oxygen extraction pipe, and avoid prolonging the nitrogen addition time of the grinding barrel.

[0021] 4. In this invention, the suction force generated by the air inlet end of the spirally upward-arranged oxygen extraction pipes is greater the closer it is to the second blower. Therefore, the positions of the air outlet ends of the several oxygen extraction pipes arranged from top to bottom are spirally arranged from bottom to top on the outer wall of the first housing, so that the suction force of the several air outlet ends arranged from bottom to top gradually decreases (the suction force is greater at the air outlet end port closer to the first blower). This avoids the first blower being unable to draw oxygen into the oxygen extraction pipe due to the excessive suction force generated by the second blower, and can increase the concentration of nitrogen added to the grinding barrel.

[0022] 5. In this invention, a second valve, a fourth valve, a third valve, a fifth valve, and a circulation pipe are added, so that this rust prevention unit can also be used as a refrigeration unit for a ball mill, thus expanding its application range;

[0023] 6. In this invention, the inlet end of the copper tube is also equipped with a drying device, which can make the gas introduced into the copper tube dry gas, and avoid the steel balls from rusting due to the presence of moisture in the nitrogen gas added to the grinding barrel. Attached Figure Description

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0027] Figure 3 For the present invention Figure 1 A schematic diagram of the grinding barrel from below;

[0028] Figure 4 For the present invention Figure 1 Schematic diagram of the rust-proof unit structure;

[0029] Figure 5 For the present invention Figure 4 A schematic diagram of a partial top-view cross-sectional structure of the copper tube;

[0030] Figure 6 For the present invention Figure 1 Schematic diagram of the front cross-sectional structure of the grinding barrel;

[0031] Figure 7 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0032] Figure 8 For the present invention Figure 4 Schematic diagram of the cross-sectional structure of the intermediate drying unit;

[0033] Figure 9 For the present invention Figure 1 Schematic diagram of the cross-sectional structure of the middle barrel lid.

[0034] In the diagram: 1. Machine body; 2. Electric telescopic rod; 3. Stirring mechanism; 4. Bucket lid; 5. Tilting motor; 6. Grinding bucket; 7. Rust prevention unit; 71. Copper pipe; 72. First shell; 73. Magnetic shield; 74. Second shell; 75. Connecting pipe; 76. Seventh valve; 77. Magnet; 78. Oxygen extraction pipe; 79. Semiconductor cooling chip; 710. Baffle plate; 8. Drying device; 81. Third shell; 82. First filter screen; 83. Second filter screen; 84. Feeding pipe; 9. Second valve; 10. Third valve; 11. Fourth valve; 12. Circulation pipe; 13. Cooling channel; 14. Electric heating tube; 15. Cooling fan; 16. First elastic sealing ring; 17. Second elastic sealing ring; 18. Feeding funnel; 19. First valve; 20. Fifth valve; 21. Exhaust pipe; 22. Sixth valve. Detailed Implementation

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example: Reference Figure 1-9 The ball mill shown includes a body 1, an electric telescopic rod 2 for driving the stirring mechanism 3 to move up and down, and a flipping motor 5 for driving the grinding barrel 6 to flip. The stirring mechanism 3 is rotatably provided with a barrel cover 4, and the barrel cover 4 is provided with a feeding funnel 18. The feature is that it also includes a rust-proof unit 7 for rust prevention of the steel balls in the grinding barrel 6.

[0037] The rust prevention unit 7 includes a spirally extending copper tube 71, with a semiconductor cooling chip 79 wrapped around its outer wall. The outlet of the copper tube 71 is connected to the inner cavity of the grinding barrel 6 via a connecting pipe 75. The outlet of the connecting pipe 75 is located near the upper end of the grinding barrel 6. A seventh valve 76 is installed on the connecting pipe 75. Several magnetic shields 73 are provided on the outer wall of the copper tube 71, communicating with the inner cavity of the copper tube 71. The inner cavity of each of the magnetic shields 73 is fixed with a magnet 77 that conforms to the bending shape of the copper tube 71. Oxygen extraction pipes 78 are provided adjacent to the magnetic shields 73. Each of the oxygen extraction pipes 78 is connected to a first housing 72, which houses a first air extraction fan. A second air extraction fan is installed on the outlet of the copper tube 71. The two shells 74, several magnets 77, and several oxygen extraction pipes 78 are all arranged spirally upwards. The barrel cover 4 is rotatably connected to the stirring shaft of the stirring mechanism 3 via bearings, and a first elastic sealing ring 16 is fixedly fitted on the stirring shaft to seal against the barrel cover 4. The lower end of the barrel cover 4 is fixedly connected to a second elastic sealing ring 17 to seal against the upper end of the grinding barrel 6. A first valve 19 is provided on the feeding funnel 18, and an exhaust pipe 21 is provided at the bottom of the grinding barrel 6, with a sixth valve 22 installed on the exhaust pipe 21. During use, the separated steel balls are placed in the grinding barrel 6, and the stirring mechanism 3 is lowered by the electric telescopic rod 2, so that the lower end of the barrel cover 4 contacts the upper end of the grinding barrel 6 to form a seal, closing the first valve 19 and controlling the sixth valve 22. Valve 22 and the seventh valve 76 are opened, allowing control of the first and second fans, as well as the semiconductor cooling chip 79. The second fan draws outside air into the copper pipe 71, while the first fan primarily extracts oxygen from the copper pipe 71. Outside air enters the copper pipe 71 and moves along the spiral flow path. Since air is mainly composed of nitrogen and oxygen, and nitrogen is diamagnetic while oxygen is paramagnetic, when air flows past the magnet 77, nitrogen moves away from the magnet, while oxygen moves closer to it. Due to inertia, both nitrogen and oxygen continue to move along the spiral flow path. When the oxygen moving closer to the magnet 77 flows through the inlet of the oxygen extraction pipe 78, it is drawn in by the first fan. The nitrogen enters the first housing 72 and exits through its exhaust end (the exhaust end of the first housing 72 is connected to a flexible hose, and the outlet end of the flexible hose is positioned away from the inlet end of the copper pipe 71 to prevent the inlet end of the copper pipe 71 from drawing in air with a high oxygen content, thus avoiding prolonged nitrogen addition time in the grinding barrel 6 and also avoiding affecting the purity of the nitrogen added to the grinding barrel 6). This achieves the separation of nitrogen and oxygen. The air in the copper pipe 71 undergoes multiple oxygen extraction operations to improve the purity of the nitrogen introduced into the grinding barrel 6. After the high-purity nitrogen enters the grinding barrel, since the molecular mass of nitrogen is smaller than that of air, a downward air displacement method is used, introducing nitrogen from the opening near the top of the grinding barrel 6. The nitrogen will compress the air and cause it to exit through its exhaust pipe 21. When all the air in the grinding barrel 6 is expelled...The seventh valve 76 and the sixth valve 22 can be controlled to close, sealing nitrogen gas within the grinding barrel 6. This effectively prevents oxygen from participating in the oxidation reaction of the steel balls, allowing for oxygen-free storage and preventing rust. Simultaneously, it controls the semiconductor cooling chip 79, the first fan, and the second fan to stop operating. The spiral shape of the copper tube 71 extends the cooling time of the semiconductor cooling chip 79. Since ambient temperature has little effect on the diamagnetic properties of nitrogen but a significant effect on the paramagnetic properties of oxygen, and for paramagnetic substances, it conforms to Curie's law X=C / T, the stronger the paramagnetism as the temperature T decreases. This facilitates the separation of oxygen from the flowing air by the magnet 77, causing the separated oxygen to move closer to the magnet. The nitrogen required for this ball mill can be directly separated from the air, making nitrogen acquisition convenient, and the structure simple and cost-effective. Furthermore, condensation can liquefy the vapor in the air entering the copper tube 71 into water droplets, removing moisture and dissolved oxygen from the air, further improving the rust prevention effect on the steel balls.

[0038] It should be noted that: 1. The heat-absorbing end of the semiconductor cooling chip 79 is in contact with the outer wall of the copper tube 71; 2. A baffle is installed in the inner cavity of the exhaust pipe 21, and the aperture of the baffle is smaller than the diameter of the steel ball, which can prevent the steel ball from being discharged from the exhaust pipe 21; 3. A breathable membrane is provided in the inner cavity of the connecting pipe 75 near the outlet end to prevent the ground powder from entering the copper tube 71 and accumulating; 4. A nitrogen concentration detector electrically connected to the ball mill controller can be installed in the inner cavity of the outlet end of the exhaust pipe 21 to detect whether the air in the grinding barrel 6 has been completely discharged.

[0039] As a preferred embodiment of this example, Figure 5 As shown, the inner cavity of the copper tube 71 is provided with several baffles 710 at an incline. The baffles 710 are arranged spirally upwards, and each baffle corresponds to one of the oxygen extraction pipes 78. They are respectively set at the air inlet of the corresponding oxygen extraction pipe 78. The function of the baffles 710 is to block and intercept the flowing oxygen and guide it into the oxygen extraction pipe 78. This can prevent only a very small amount of oxygen from being drawn into the oxygen extraction pipe 78 due to the effect of motion inertia, and can effectively increase the concentration of nitrogen in the gas added to the grinding barrel 6 (reduce the oxygen content in the air).

[0040] It is important to note that the angle of inclination of the baffle plate 710 to the horizontal direction (i.e., the X-axis in the figure) shall not exceed 45 degrees, and the length H of the baffle plate 710 shall be less than half the diameter of the copper tube 71. This is to avoid the baffle plate 710 opening angle and length being too large, which would cause too much nitrogen to come into contact with the baffle plate 710 and be guided and sucked into the first housing 72 for discharge, resulting in a decrease in the amount of nitrogen added to the grinding barrel 6 per unit time and prolonging the nitrogen addition time.

[0041] As a preferred embodiment of this invention, not shown in the figure, the angle of inclination of the spirally arranged baffles 710 with the horizontal direction gradually decreases from bottom to top. Since multiple oxygen separations are required, with each oxygen extraction operation, the oxygen content in the air flowing in the copper pipe 71 becomes lower and lower, and the thickness of the oxygen moving near the magnet 77 becomes thinner and thinner. Therefore, setting the inclination angle of the baffles 710 to be smaller and smaller can reduce the contact between the baffles 710 and the nitrogen, avoid guiding it into the oxygen extraction pipe 78, and further avoid prolonging the nitrogen addition time of the grinding barrel 6.

[0042] As a preferred embodiment of this example, Figure 4 As shown, the first pump is located below several oxygen extraction pipes 78. The outlets of the several oxygen extraction pipes 78 arranged from top to bottom are spirally arranged on the outer wall of the first housing 72. The closer the inlet of the several oxygen extraction pipes 78 is to the second fan, the greater the suction force they generate. Therefore, the arrangement of the outlets of the several oxygen extraction pipes 78 arranged from top to bottom on the outer wall of the first housing 72 in a spiral shape from bottom to top makes the suction force of the outlets gradually decrease from bottom to top (the suction force is greater closer to the outlet of the first fan). This avoids the first fan being unable to draw oxygen into the oxygen extraction pipes 78 due to the excessive suction force generated by the second fan, and can increase the concentration of nitrogen added to the grinding barrel 6.

[0043] It should be noted that the magnetism of the corresponding spirally arranged magnets 77 gradually increases from bottom to top to counteract the increasing attraction force, which is beneficial for the magnets 77 to separate oxygen from the gas through magnetic action.

[0044] As a preferred embodiment of this example, Figure 7As shown, the outlet end of the copper pipe 71 passes through the grinding barrel 6 and connects to the inlet end of the spiral and upward-extending cooling channel 13 provided inside the grinding barrel 6. The outlet end of the cooling channel 13 is connected to the circulation pipe 12, and the lower end of the circulation pipe 12 is connected to the copper pipe 71, with the connection point close to the inlet end of the copper pipe 71. The inlet end of the copper pipe 71, the outlet end of the copper pipe 71, the outlet end of the first housing 72, and the circulation pipe 12 are respectively equipped with a second valve 9, a fourth valve 11, a third valve 10, and a fifth valve 20. At the same time, this anti-rust unit can also be used as the cooling unit of the ball mill (because the steel balls will rub against the inner wall of the grinding barrel and between the steel balls during the grinding process, thus causing the inside of the grinding barrel to rust). (If the temperature rises and the internal temperature is too high, it will affect the service life of the ball mill and the grinding performance of the material.) When used as a refrigeration unit, the sixth valve 22, the second valve 9, and the third valve 10 can be closed, and the fourth valve 11 (which is closed when adding nitrogen) and the fifth valve 20 (which is closed when adding nitrogen) can be opened. The second fan and the semiconductor cooling chip 79 are controlled to work. The semiconductor cooling chip 79 is used to cool the air in the copper tube 71, and the second fan is used to make the condensed air enter the cooling channel 13 to cool the grinding barrel 6. The air that has absorbed heat enters the copper tube 71 through the circulation pipe 12 for cooling, and then enters the cooling channel 13 again, thus forming a cycle.

[0045] As a preferred embodiment of this example, Figure 4 As shown, the inlet end of the copper tube 71 is fixedly connected to a drying device 8 for removing moisture from the gas entering the copper tube 71. This device can remove moisture from the air and oxygen dissolved in the moisture, ensuring that the gas entering the copper tube 71 is dry, thus preventing the steel balls from rusting due to moisture in the nitrogen added to the grinding barrel.

[0046] As a preferred embodiment of this example, Figure 8 As shown, the drying device 8 includes a third housing 81 with a first filter screen 82 and a feeding pipe 84, and a second filter screen 83 installed in the inner cavity of the copper pipe 71. The inner cavity of the third housing 81 is filled with granular desiccant, which can dry the gas entering the copper pipe 71. The first filter screen 82 is set to prevent the desiccant from falling off, while the second filter screen 83 is set to prevent the desiccant from entering the copper pipe 71 by gravity when the grinding barrel 6 is turned over by the flipping motor 5, thus avoiding the accumulation of desiccant in the copper pipe 71 and affecting the air flow.

[0047] As a preferred embodiment of this example, Figure 3 As shown, a cooling fan 15 is fixedly installed at the bottom of the grinding barrel 6. The cooling fan 15 is mainly used to quickly dissipate heat from the heat dissipation end wrapped in the semiconductor cooling chip 79, so as to quickly cool the gas in the copper tube 71.

[0048] As a preferred embodiment of this example, Figure 6 As shown, the inner cavity of the grinding barrel 6 is equipped with an electric heating tube 14 that extends spirally upward. When the material being ground in a wet ball mill contains a large amount of water, the steel balls will be covered with a large amount of water. This allows the upper end of the barrel cover 4 to be closed with the upper end cover of the grinding barrel 6, opening the first valve 19. At this time, the stirring shaft of the stirring mechanism 3 is inserted into a large number of steel balls, and the steel balls are stirred while being heated, which can accelerate the evaporation of water on the steel balls. After the steel balls are dried, the nitrogen addition operation is performed.

[0049] It is important to note that for wet ball mills, before adding nitrogen, the flow channels inside the exhaust pipe 21 must be kept clear, and the exhaust pipe 21 and the blocking screen must be cleared.

[0050] Working principle of this invention: In this ball mill, all electrical equipment is electrically connected to the controller on the ball mill. During use, the separated steel balls are placed in the grinding drum 6, and the electric telescopic rod 2 drives the stirring mechanism 3 to descend, causing the lower end of the drum lid 4 to contact the upper end of the grinding drum 6 to form a seal. The first valve 19 is closed, and the sixth valve 22 and the seventh valve 76 are opened. At this time, the first and second fans, as well as the semiconductor cooling chip 79, can be controlled to operate. The second fan draws outside air into the copper pipe 71, while the main function of the first fan is to extract oxygen from the copper pipe 71. Outside air enters the copper pipe 71 and moves along the spiral flow channel. Since air mainly... If the gas is composed of nitrogen and oxygen, with nitrogen exhibiting diamagnetic properties and oxygen exhibiting paramagnetic properties, when air flows past magnet 77, nitrogen moves away from magnet 77, while oxygen moves towards magnet 77. Due to inertia, both nitrogen and oxygen continue to move along the spiral flow path. When the oxygen moving towards magnet 77 flows through the inlet of oxygen extraction pipe 78, it is drawn into the first housing 72 by the first fan and discharged from its exhaust end (the exhaust end of the first housing 72 is connected to a flexible hose, and the outlet of the flexible hose is positioned away from the inlet of copper pipe 71 to prevent the inlet of copper pipe 71 from drawing in air with a high oxygen content, thus avoiding prolonged nitrogen addition time in grinding barrel 6 and also preventing the purity of nitrogen added to grinding barrel 6 from being compromised). This process separates nitrogen and oxygen. Multiple oxygen extraction operations are performed within the copper tube 71 to increase the purity of the nitrogen introduced into the grinding barrel 6. After the high-purity nitrogen enters the grinding barrel, because the molecular weight of nitrogen is less than that of air, a downward air displacement method is used, introducing nitrogen from the opening near the top of the grinding barrel 6. The nitrogen compresses the air, causing it to exit through the exhaust pipe 21. Once all the air in the grinding barrel 6 has been expelled, the seventh valve 76 and the sixth valve 22 can be closed, effectively preventing oxygen from participating in the oxidation reaction of the steel balls. This allows for oxygen-free storage of the steel balls, preventing rusting. Simultaneously, the semiconductor cooling chip 79, the first fan, and the second fan are stopped. The copper tube 71 is configured as a spiral... The purpose of this design is to extend the cooling time of the semiconductor refrigeration chip 79 to the air. Since the ambient temperature has little effect on the diamagnetic properties of nitrogen but a great effect on the paramagnetic properties of oxygen, for paramagnetic materials, it conforms to Curie's law X=C / T. As the temperature T decreases, the magnetism it produces becomes stronger, which is beneficial for the magnet 77 to separate oxygen from the flowing air through magnetism, causing the separated flowing oxygen to move closer to the magnet. The nitrogen required by this ball mill can be directly separated from the air, which is convenient for obtaining nitrogen. At the same time, through condensation, the vapor contained in the air entering the copper tube 71 can also be liquefied into water droplets, removing moisture from the air and oxygen dissolved in the moisture, further improving the rust prevention effect on the steel balls.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A semi-industrial anti-rust vertical mill for steel balls, comprising a machine body (1), an electric telescopic rod (2) for driving a stirring mechanism (3) to move up and down, and a tilting motor (5) for driving a grinding drum (6) to tilt, wherein a drum cover (4) is rotatably provided on the upper part of the stirring mechanism (3), and a feeding funnel (18) is provided on the drum cover (4), characterized in that: It also includes a rust-preventing unit (7) for rust prevention of the steel balls inside the grinding barrel (6); The rust prevention unit (7) includes a spiral copper tube (71) extending upwards, and a semiconductor cooling chip (79) is wrapped around the outer wall of the copper tube (71). The outlet end of the copper tube (71) is connected to the inner cavity of the grinding barrel (6) through a connecting pipe (75). The outlet end of the connecting pipe (75) is located near the upper end of the grinding barrel (6). A seventh valve (76) is installed on the connecting pipe (75). Several magnetic shields (73) communicating with the inner cavity of the copper tube (71) are provided on the outer wall of the copper tube (71). Furthermore, each of the magnetic shields (73) has a magnet (77) fixed in its inner cavity that is in the same bending shape as the copper tube (71). Each of the magnetic shields (73) has an oxygen pumping pipe (78) installed on its adjacent part. Each of the oxygen pumping pipes (78) is connected to a first housing (72) with a first air pump installed inside. A second housing (74) with a second air pump installed inside is installed on the outlet end of the copper tube (71). The magnets (77) and the oxygen pumping pipes (78) are all arranged spirally upward. The bucket lid (4) is rotatably connected to the stirring shaft of the stirring mechanism (3) via a bearing, and a first elastic sealing collar (16) that contacts and seals the bucket lid (4) is fixedly sleeved on the stirring shaft. A second elastic sealing collar (17) that contacts and seals the upper end of the grinding bucket (6) is fixedly connected to the lower end of the bucket lid (4). The feeding funnel (18) is provided with a first valve (19), the bottom of the grinding barrel (6) is provided with an exhaust pipe (21), and a sixth valve (22) is installed on the exhaust pipe (21). The inner cavity of the copper tube (71) is provided with several baffles (710) at an incline. The baffles (710) are arranged spirally upwards, and the baffles (710) correspond one-to-one with the oxygen extraction pipes (78), and are respectively set at the air inlet of the corresponding oxygen extraction pipes (78). The angle of inclination of the several wind deflectors (710) arranged in a spiral upward direction with respect to the horizontal direction gradually decreases from bottom to top; The first air pump is located below several oxygen pumping pipes (78). The outlet of several oxygen pumping pipes (78) arranged from top to bottom is spirally arranged from bottom to top on the outer wall of the first housing (72). The outlet end of the copper tube (71) passes through the grinding barrel (6) and is connected to the inlet end of the spiral and upward-extending cooling channel (13) provided in the inner cavity of the grinding barrel (6). The outlet end of the cooling channel (13) is connected to the circulation pipe (12), and the lower end of the circulation pipe (12) is connected to the copper tube (71), with the connection point close to the inlet end of the copper tube (71). The inlet end of the copper tube (71), the outlet end of the copper tube (71), the outlet end of the first housing (72), and the circulation pipe (12) are respectively equipped with a second valve (9), a fourth valve (11), a third valve (10), and a fifth valve (20).

2. The semi-industrial anti-rust vertical mill for steel balls according to claim 1, characterized in that: The inlet end of the copper tube (71) is fixedly connected to a drying device (8) for removing moisture from the gas entering the copper tube (71).

3. A semi-industrial anti-rust vertical mill for steel balls according to claim 2, characterized in that: The drying device (8) includes a third housing (81) with a first filter screen (82) and a feeding pipe (84) and a second filter screen (83) installed in the inner cavity of the copper pipe (71).

4. A semi-industrial anti-rust vertical mill for steel balls according to claim 1, characterized in that: A cooling fan (15) is fixedly installed at the bottom of the grinding barrel (6).

5. A semi-industrial anti-rust vertical mill for steel balls according to claim 1, characterized in that: The inner cavity of the grinding barrel (6) is provided with an electric heating tube (14) that extends spirally upward.

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