Variable frequency speed regulating device used in magnesium powder air flow mill

Abstract

This invention relates to the technical field of variable frequency speed control for air classifier mills, and discloses a variable frequency speed control device used in magnesium powder air classifier mills. The device includes a recovery mechanism that generates negative pressure to draw airflow containing qualified magnesium powder into a separation device, causing the magnesium powder to settle in a collection tank. An oil injection unit is installed on the recovery mechanism and linked to a unit to adjust the negative pressure adsorption force between the recovery mechanism and the collection tank. The recovery mechanism includes a recovery pipe, two conveying pipes respectively installed on the collection tank, an energy-saving motor connected to the recovery pipe, a variable frequency speed control mechanism connected to the energy-saving motor, and fan blades connected to the energy-saving motor. This device ensures the motor is always in a stable and smooth working state, effectively reducing motor operating resistance and mechanical losses, improving motor output efficiency, and reducing ineffective energy consumption, thereby significantly improving the overall energy-saving effect of the motor. It also ensures long-term stable and reliable operation of the motor, further extending the motor's service life and reducing equipment operating energy consumption and maintenance costs.

Description

Technical Field

[0001] This invention relates to the technical field of variable frequency speed control for air classifier mills, specifically a variable frequency speed control device used in magnesium powder air classifier mills. Background Technology

[0002] The variable frequency speed control technology for magnesium powder airflow mills addresses the flammable nature of magnesium powder by using an explosion-proof frequency converter as its core to dynamically adjust the speed of the classifying wheel and the airflow velocity. It can precisely control the grinding particle size of magnesium powder (typically 2-200μm), avoiding sudden changes in speed that could cause frictional heating of the magnesium powder. Simultaneously, it allows for on-demand adjustment of production capacity, reducing energy consumption and meeting the safe production requirements of high-purity, ultrafine magnesium powder in fields such as new energy and aerospace.

[0003] However, existing variable frequency speed control devices for magnesium powder airflow mills still have some problems. During the process of variable frequency speed control of the energy-saving motor, the friction between the energy-saving motor and the fan blades will change. Therefore, it is necessary to add lubricating oil during or before and after operation. During the lubrication process, the motor shaft temperature will rise due to friction. In winter or when the ambient temperature is low, the lubricating oil is too viscous or the oil temperature is too low. Therefore, when it comes into contact with the motor shaft, it will cause damage to the motor shaft, resulting in the failure of variable frequency speed control.

[0004] Therefore, how to prevent a large temperature difference between the lubricating oil and the motor shaft during the lubrication process, which could damage the motor shaft, is a problem that needs to be solved. Summary of the Invention

[0005] This invention provides a variable frequency speed control device for use in a magnesium powder air jet mill to solve the above-mentioned problems existing in the prior art.

[0006] A variable frequency speed control device for use in a magnesium powder air jet mill includes:

[0007] The recycling mechanism draws airflow containing qualified magnesium powder into the separation equipment by generating negative pressure, causing the magnesium powder to settle in the collection tank.

[0008] An oil injection unit is installed on the recovery mechanism and is used to inject lubricating oil into the recovery mechanism;

[0009] A linkage unit, located on the collection tank, is used to adjust the negative pressure adsorption force between the recycling mechanism and the collection tank;

[0010] The recycling mechanism includes a recycling pipeline, two conveying pipes respectively installed on the collection tank, an energy-saving motor connected to the recycling pipeline, a variable frequency speed control mechanism connected to the energy-saving motor, and fan blades connected to the energy-saving motor.

[0011] One of the delivery pipes is connected to the recycling pipe.

[0012] Furthermore, the oil injection unit includes an oil guide seat fixedly installed on the recovery pipe, a first chamber built into the oil guide seat, a first oil injection seat and a second oil injection seat respectively disposed on the oil guide seat and respectively communicating with the first chamber, a movable seat built into the first chamber, an oil injection pipe connected to the movable seat and passing through the oil guide seat, and an exhaust valve disposed on the oil guide seat and communicating with the first chamber.

[0013] The movable seat is provided with an L-shaped first connecting channel, which is connected to the fuel injection pipe and the first chamber respectively.

[0014] Both the first and second oil injection seats are provided with oil delivery channels. The first oil injection seat is provided with a spray seat at its outlet, and the spray seat is provided with a second chamber.

[0015] The second chamber is connected to the oil delivery channel, the oil delivery channel in the second oil injection seat is connected to the first chamber, and the movable seat abuts against the oil injection end of the spray seat.

[0016] Furthermore, the diameter of the movable seat gradually decreases along the direction close to the spray seat to form a sealing end. The sealing end abuts against the spray seat. A sealing block is preset inside the movable seat. The sealing end is also provided with an annular protrusion in the circumferential direction. The end of the first chamber away from the first oil filling seat has a convex-shaped structure, and a return spring is used to connect the shoulder of the first chamber and the annular protrusion.

[0017] The sealing block has elasticity and abuts against the spray base, and the sealing block abuts against the spray base through a set return spring.

[0018] Furthermore, a preheating cavity is provided inside the oil guide seat, a preheating liquid is placed inside the preheating cavity, and a heating element is located in the preheating cavity. There is an overlapping area between the preheating cavity and the first chamber, and the preheating cavity preheats the lubricating oil in the first chamber.

[0019] Furthermore, the linkage unit includes an adjustment seat fixedly installed on the collection tank, a first driven part and a second driven part with the same structure symmetrically arranged on the adjustment seat, a conveying pipe for connecting the first driven part and the second driven part, a valve stem connected to the first driven part and the second driven part respectively, and a ball valve disposed in the two conveying pipes;

[0020] The valve stem is connected to the ball valve, thereby regulating the movement of the ball valve.

[0021] Furthermore, the first driven part includes a box body and a connecting seat fixed on the adjusting seat, a guide tube for connecting the box body and the collection tank, a guide seat located in the box body, a propulsion cavity opened in the connecting seat, a guide channel provided in the box body, a movable block located in the propulsion cavity, and an actuator connected to the movable block;

[0022] The movable block divides the propulsion chamber into an upper chamber and a lower chamber, and the lower chamber is equipped with an air inlet valve and an air outlet valve.

[0023] One of the guide channels is used to connect the box body and the upper chamber, and the other guide channel is connected to the outer wall of the connecting seat. The guide seat has a U-shaped structure. By moving the actuator, the position of the guide seat is changed, the transport direction of the airflow is guided, and the second driven part is driven to move.

[0024] The other guide channel is connected to the delivery pipe.

[0025] Furthermore, the actuator includes a push rod connected to the movable block, a slider connected to the push rod and the adjusting seat respectively, a movable rod movably connected to the slider, a rocker arm connected to the output end of the movable rod and rotatably connected to the adjusting seat, a conveying shaft connected to the rocker arm, a first bevel gear disposed on the conveying shaft, a second bevel gear meshing with the first bevel gear, two eccentric wheels respectively sleeved on the conveying shaft, two drive arms connected to the eccentric wheels, a drive frame for connecting the other ends of the two drive arms, an arc-shaped groove formed on the drive frame, a drive block located in the arc-shaped groove, and a piston rod connected to the drive block;

[0026] The piston rod is connected to the guide seat. Adjusting the position of the guide seat completes the blocking of the guide channel.

[0027] The orthographic projection direction of the two drive arms, and the angle between the two drive arms;

[0028] The second bevel gear is connected to the valve stem.

[0029] Furthermore, it also includes a worktable, two feeding mechanisms mounted on the worktable, a conveying mechanism connected to the feeding mechanisms, and an air mill unit connected to the output end of the conveying mechanism;

[0030] Another delivery pipe is connected to the air mill unit.

[0031] Furthermore, the air mill unit includes at least two air pumps, an air supply pipe connected to the air pumps, an air supply pipe for connecting the air supply pipe to the feed pipe of the conveying mechanism, an air mill disc for connecting the two conveying pipes, and an anti-backflow pipe and an exhaust pipe disposed on the air mill disc.

[0032] The exhaust pipe is connected to another delivery pipe;

[0033] The feed pipe includes a material pipe connected to the conveying mechanism, and a first air inlet pipe and a second air inlet pipe located in the conveying pipe;

[0034] The material pipe, the first air inlet pipe, and the second air inlet pipe are all funnel-shaped structures.

[0035] The small end of the first air inlet pipe is connected to the small end of the second air inlet pipe, and the material pipe is connected to the second air inlet pipe and is at a preset distance from the small end of the second air inlet pipe.

[0036] The feeding mechanism and conveying mechanism are existing technologies, with one of the feeding mechanisms being built into the worktable.

[0037] Furthermore, the air grinding disc includes an upper grinding disc and a lower grinding disc, a locking clamp for connecting the upper grinding disc and the lower grinding disc, and a nozzle seat in both the upper grinding disc and the lower grinding disc. After being locked by the locking clamp, the two nozzle seats abut against each other, and an air grinding area is formed between the inner walls of the nozzle seats. There are also nozzles that are connected to the exhaust pipe and the anti-backflow pipe respectively and are located in the air grinding area. There are gaps between the nozzles.

[0038] There is a gap between the outer wall of the nozzle seat and the upper grinding disc, and the nozzle seat is provided with vent holes in both the circumferential and radial directions;

[0039] One of the conveying mechanisms conveys magnesium powder into the air mill area through the circumferential vent of the nozzle seat, and the other conveying mechanism conveys magnesium powder into the air mill area through the radial vent of the nozzle seat.

[0040] Beneficial Effects: This invention discloses a variable frequency speed control device used in a magnesium powder air classifier mill. During the lubrication process, the large temperature difference between the lubricating oil and the motor shaft can cause damage to the motor shaft. This device includes an oil injection unit. During the oil injection process, lubricating oil at a certain temperature is filled from the second oil injection seat into the first chamber. During this process, the exhaust valve is open, allowing the lubricating oil at a certain temperature to be filled into the first chamber. After the exhaust valve has been open for a predetermined time, it is closed, and then low-temperature lubricating oil is injected into the first oil injection seat. When the low-temperature lubricating oil fills the first chamber, it can lift the movable seat and move it within the first chamber, allowing the low-temperature lubricating oil to flow into the first chamber. Then, the movable seat abuts against the first chamber, at which point the oil injection pipe can extend out of the oil guide seat. Then, lubricating oil at a certain temperature is injected into the output shaft of the motor. As the amount of oil injected into the first oil filler increases, the temperature of the lubricating oil in the first chamber decreases, thus slowly reducing the temperature of the lubricating oil and preventing damage to the motor caused by excessively low lubricating oil temperature. This keeps the motor in a stable and smooth working state, effectively reducing motor running resistance and mechanical losses, improving motor output efficiency, and reducing ineffective energy consumption, thereby significantly improving the overall energy-saving effect of the motor. At the same time, it ensures long-term stable and reliable operation of the motor, further extending the motor's service life and reducing equipment operating energy consumption and maintenance costs. After the injection is completed, the first oil filler stops injecting oil, and then the heating element starts working, which keeps the lubricating oil in the first chamber warm and prevents it from becoming too cold, which could cause the oil injection to fail. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a variable frequency speed control device used in a magnesium powder air classifier mill according to the present invention;

[0042] Figure 2 This is a schematic diagram of the air mill unit structure of the present invention;

[0043] Figure 3 This is a schematic diagram of the air grinding disc structure of the present invention;

[0044] Figure 4 This is a cross-sectional view of the oil injection unit of the present invention;

[0045] Figure 5 This is a schematic diagram of the first connecting channel structure of the present invention;

[0046] Figure 6 This is a schematic diagram of the linkage unit structure of the present invention;

[0047] Figure 7 This is a schematic diagram of the movable rod structure of the present invention;

[0048] Figure 8 This is a schematic diagram of the first driven part structure of the present invention;

[0049] Figure 9 This is a schematic diagram of the first bevel gear structure of the present invention.

[0050] Reference numerals: 1. Workbench; 2. Feeding mechanism; 3. Conveying mechanism; 4. Air mill unit; 41. Air pump; 42. Air pipe; 43. Feed pipe; 431. First air inlet pipe; 432. Second air inlet pipe; 433. Material pipe; 44. Exhaust pipe; 45. Air mill disc; 451. Upper mill disc; 452. Lower mill disc; 453. Locking clamp; 454. Nozzle seat; 455. Nozzle; 46. Anti-backflow pipe; 5. Oil injection unit; 51. Oil guide seat; 52. First oil injection seat; 53. Second oil injection seat; 54. First chamber; 55. Second chamber; 56. Spray seat; 57. Movable seat; 571. First connecting channel; 572. Return spring 573. Sealing block; 58. Injection pipe; 59. Preheating chamber; 510. Heating element; 6. Recovery mechanism; 7. Linkage unit; 71. First driven part; 711. Box body; 712. Connecting seat; 713. Guide seat; 714. Guide channel; 715. Movable block; 716. Push rod; 717. Slider; 718. Movable rod; 719. Rocker arm; 720. Eccentric wheel; 721. Conveying shaft; 723. Drive arm; 724. Drive frame; 725. Piston rod; 726. First bevel gear; 727. Second bevel gear; 73. Second driven part; 74. Conveying pipe; 75. Adjusting seat; 76. Valve stem; 8. Collection tank. Detailed Implementation

[0051] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0052] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0053] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0054] This invention discloses a variable frequency speed control device used in a magnesium powder air jet mill, with reference to... Figures 1-9 ,include:

[0055] The recovery mechanism 6 generates negative pressure to draw the airflow containing qualified magnesium powder into the separation equipment, causing the magnesium powder to settle in the collection tank 8. An oil injection unit 5 is installed on the recovery mechanism 6 to inject lubricating oil into it. A linkage unit 7 is installed on the collection tank 8 to adjust the negative pressure adsorption force between the recovery mechanism 6 and the collection tank 8. The recovery mechanism 6 includes a recovery pipe, two conveying pipes 74 respectively installed on the collection tank 8, an energy-saving motor connected to the recovery pipe, a variable frequency speed control mechanism connected to the energy-saving motor, and fan blades connected to the energy-saving motor. One of the conveying pipes 74 is connected to the recovery pipe. The oil injection unit 5 can progressively reduce the temperature of the injected lubricating oil, preventing excessive temperature differences between the injected lubricating oil and the rotating shaft of the energy-saving motor, which could damage the motor. The variable frequency speed control mechanism can change the speed of the energy-saving motor, thereby controlling the speed of the fan blades.

[0056] The oil injection unit 5 includes an oil guide seat 51 fixedly installed on the recovery pipe, a first chamber 54 built into the oil guide seat 51, a first oil injection seat 52 and a second oil injection seat 53 respectively disposed on the oil guide seat 51 and communicating with the first chamber 54, a movable seat 57 built into the first chamber 54, an oil injection pipe 58 connected to the movable seat 57 and passing through the oil guide seat 51, and an exhaust valve disposed on the oil guide seat 51 and communicating with the first chamber 54; the movable seat 57 is provided with an L-shaped... The first connecting channel 571 is connected to the oil injection pipe 58 and the first chamber 54 respectively; both the first oil injection seat 52 and the second oil injection seat 53 are provided with oil delivery channels, and the first oil injection seat 52 is provided with a spray seat 56 at its outlet, and the spray seat 56 is provided with a second chamber 55; the second chamber 55 is connected to the oil delivery channel, and the oil delivery channel in the second oil injection seat 53 is connected to the first chamber 54; the movable seat 57 abuts against the oil injection end of the spray seat 56; during the oil injection operation, lubricating oil with a certain temperature flows from the first... The lubricating oil in the first chamber 54 is filled into the second oil injection seat 53. During this process, the vent valve is open, allowing lubricating oil at a certain temperature to be filled into the first chamber 54. After the vent valve has been open for a predetermined time, it is closed. Then, low-temperature lubricating oil is injected into the first oil injection seat 52. When the low-temperature lubricating oil fills the first chamber 54, it can lift the movable seat 57 and move it within the first chamber 54. At this time, the low-temperature lubricating oil can flow into the first chamber 54. Then, the movable seat 57 abuts against the first chamber 54, and the oil injection pipe... 58 can extend the oil guide seat 51, and then lubricating oil with a certain temperature can be injected into the output shaft of the motor. As the amount of oil injected by the first oil injection seat 52 increases, the temperature of the lubricating oil in the first chamber 54 decreases, thereby slowly reducing the temperature of the lubricating oil and preventing damage to the motor caused by excessively low lubricating oil temperature. After the injection work is completed, the first oil injection seat 52 stops injecting oil, and then the heating element 510 starts working, thereby keeping the lubricating oil in the first chamber 54 warm and preventing its temperature from being too low, which would cause the oil injection work to fail.

[0057] This device fills the first chamber 54 with lubricating oil at a certain temperature during the initial oil filling process, thus pre-filling the first chamber 54 with high-temperature oil. This prevents the subsequent low-temperature oil from directly contacting the cold wall of the first chamber 54 and causing a sudden temperature drop. It also establishes a preheated protective oil film for the motor output shaft. Then, low-temperature oil is injected from the first oil filling seat 52. After entering the first chamber 54, the low-temperature oil will push up the movable seat 57 and mix with the high-temperature oil already in the first chamber 54. This allows the overall oil temperature of the first chamber 54 to slowly transition from high temperature to the predetermined temperature, rather than directly injecting low-temperature oil. This avoids the low-temperature oil directly contacting the high-temperature output shaft of the motor, which could lead to an excessive temperature difference between the two and damage to the motor.

[0058] When the heating element 510 is working, it can ensure that the residual lubricating oil in the first chamber 54 is always kept at a suitable temperature. When the next oil is injected, only a small amount of high-temperature oil needs to be added to quickly start the process, which greatly improves the efficiency of continuous oil injection and avoids oil injection failure due to low oil temperature.

[0059] The movable seat 57, along the direction close to the spray seat 56, gradually decreases in diameter to form a sealing end, which abuts against the spray seat 56. A sealing block 573 is pre-installed within the movable seat 57. The sealing end also has an annular protrusion in its circumferential direction. The end of the first chamber 54 away from the first oil filling seat 52 has a convex-shaped structure, and a return spring 572 connects the shoulder of the first chamber 54 to the annular protrusion. The sealing block 573 has elasticity and abuts against the spray seat 56. The sealing block 573 abuts against the spray seat 56 via the provided return spring 572. The movable seat 57 has a groove for placing the sealing block 573. The bottom of the sealing block 573 is away from the spray seat 56 relative to the annular protrusion, thus ensuring proper oil spraying. During the process, the lubricating oil in the first oil injection seat 52 can impact the sealing block 573, and then mix with the original lubricating oil in the first chamber 54 along the transition area between the sealing block 573 and the annular protrusion. Through the above-mentioned structure, the spray area of ​​the lubricating oil can be increased, thereby increasing the contact area between it and the high-temperature oil in the first chamber 54, so as to complete the adjustment of the lubricating oil temperature and realize the injection of lubricating oil. That is, through impact and guidance, a "fan-shaped diffusion" is formed, which greatly increases the contact area with the original high-temperature oil in the first chamber 54. Then, after the low-temperature oil injection is stopped, with the cooperation of the return spring 572, the sealing block 573 can abut against the spray seat 56, thereby stopping the oil injection of the first oil injection seat 52.

[0060] The sealing block 573 is elastic and will undergo slight deformation when impacted by low-temperature oil. This flexible contact can further disperse the oil flow direction through deformation, allowing the low-temperature oil to penetrate into the high-temperature oil more evenly, achieving gradual mixing and ultimately making the overall oil temperature in the chamber more stable. The conical sealing end and the return spring 572 simultaneously abut against the spray seat 56, making the contact pressure between the sealing end and the spray seat 56 more uniform. Even if there are slight machining errors in the spray seat 56 or the movable seat 57, the conical structure can automatically compensate for the gap through the elasticity of the return spring 572, forming a reliable seal and preventing the lubricating oil in the chamber from leaking from the contact gap.

[0061] The oil guide seat 51 has a preheating chamber 59, a preheating liquid is placed in the preheating chamber 59, and a heating element 510 is located in the preheating chamber 59. There is an overlapping area between the preheating chamber 59 and the first chamber 54. The preheating chamber 59 preheats the lubricating oil in the first chamber 54. The heating element 510 can regulate the temperature of the lubricating oil in the first chamber 54 to avoid damage to the motor output shaft due to excessive temperature difference when it comes into contact with the motor when the temperature is too low.

[0062] The linkage unit 7 includes an adjusting seat 75 fixedly installed on the collection tank 8, a first driven part 71 and a second driven part 73 symmetrically arranged on the adjusting seat 75 with identical structures, a conveying pipe 74 for connecting the first driven part 71 and the second driven part 73, a valve stem 76 connected to the first driven part 71 and the second driven part 73 respectively, and ball valves disposed in the two conveying pipes 74; the valve stem 76 is connected to the ball valve, thereby adjusting the movement of the ball valve; through the cooperative use of the first driven part 71 and the second driven part 73, the first driven part 71 starts to work, and after completing the closing work of one of the ball valves, excess gas can enter the second driven part 73 along the conveying pipe 74, and then the second driven part 73 starts to work, thereby driving the other ball valve to start working, thereby keeping the other ball valve in a closed state, preventing damage to the collection tank 8 when the magnesium powder in the collection tank 8 burns, and preventing the flame from entering the magnesium powder processing area along the pipe, thereby causing damage to the entire production line.

[0063] The first driven part 71 includes a housing 711 and a connecting seat 712 fixed on the adjusting seat 75, a guide pipe for connecting the housing 711 and the collection tank 8, a guide seat 713 located in the housing 711, a propulsion chamber opened in the connecting seat 712, a guide channel 714 provided in the housing 711, a movable block 715 located in the propulsion chamber, and an actuator connected to the movable block 715; the movable block 715 divides the propulsion chamber into an upper chamber and a lower chamber, and the lower chamber is also provided with an air inlet valve and an air outlet valve; one of the guide... Channel 714 connects the housing 711 to the upper chamber. Another guide channel 714 connects to the outer wall of the connecting seat 712. The guide seat 713 has a U-shaped structure. By moving the actuator, the position of the guide seat 713 is changed, guiding the airflow direction and driving the second driven part 73 to move. The other guide channel 714 connects to the conveying pipe 74. After the magnesium powder in the collection tank 8 is burned, the operation of the fan blades is adjusted by the frequency conversion speed regulation mechanism to stop the fan blades. Because the combustion of magnesium powder generates a huge amount of heat, it leads to the gas in the collection tank 8... As the pressure increases, the gas can enter the upper chamber along the housing 711 and guide channel 714. With the intensification of the reaction, the pressure in the upper chamber gradually increases, pushing the movable block 715 to move within the connecting seat 712. The moving movable block 715 then drives the actuator to move, which in turn drives the guide seat 713 and one of the ball valves to move. The moving guide seat 713 then connects the other guide channel 714 to the space inside the housing 711, allowing the gas to be transported to the second driven part along the delivery pipe 74. Within 73, this enables the other ball valve to start working. When one of the ball valves starts working, it can cut off the channel between the collection tank 8 and the gas mill unit 4, preventing the flame from igniting the magnesium powder in the gas mill unit 4. The other ball valve changes its working state with the pressure inside the collection tank 8, thereby disconnecting the recovery mechanism 6 from the collection tank 8 and preventing the flame from spreading. After the adjustment work is completed, as the air pressure decreases, the two ball valves are restored to their initial state by filling the lower chamber with air, thereby completing the flame retardant work on the magnesium powder. During the above process, the gas mill unit 4 stops working.

[0064] The actuator includes a push rod 716 connected to the movable block 715, a slider 717 connected to both the push rod 716 and the adjusting seat 75, a movable rod 718 movably connected to the slider 717, a rocker arm 719 connected to the output end of the movable rod 718 and rotatably connected to the adjusting seat 75, a conveying shaft 721 connected to the rocker arm 719, a first bevel gear 726 mounted on the conveying shaft 721, and a second bevel gear 727 meshing with the first bevel gear 726, respectively sleeved on... Two eccentric wheels 720 on the conveyor shaft 721, two drive arms 723 connected to the eccentric wheels 720, a drive frame 724 connected to the other end of the two drive arms 723, an arc-shaped groove on the drive frame 724, a drive block located in the arc-shaped groove, and a piston rod 725 connected to the drive block; the piston rod 725 is connected to a guide seat 713, adjusting the position of the guide seat 713 to complete the blocking work of the guide channel 714; the orthographic projection direction of the two drive arms 723, the two drive arms 72 There is an angle between 3; the second bevel gear 727 is connected to the valve stem 76; when the movable block 715 starts to move, it can drive the push rod 716 to move, and then the moving push rod 716 can drive the movable rod 718 to move, and then the moving movable rod 718 can drive the rocker arm 719 to rotate, thereby driving the conveying shaft 721 to rotate, and then the moving conveying shaft 721 can drive the valve stem 76 to move through the cooperation of the first bevel gear 726 and the second bevel gear 727, thereby driving the ball valve to work. In this process, the moving conveying shaft 721 can drive the eccentric wheel 720 to rotate, and the moving eccentric wheel 720 can drive the drive arm 723 to rotate, thereby causing the drive frame 724 to be in a swinging state. Then the moving drive frame 724 can cause the piston rod 725 to move, adjusting the position of the guide seat 713, so that during violent reactions, the empty chamber can be used as a temporary storage chamber to avoid excessive gas pressure, and at the same time, the collection tank 8 can be placed independently to avoid the flame from spreading, thereby ensuring the smooth operation of the device.

[0065] This device also includes a workbench 1, two feeding mechanisms 2 mounted on the workbench 1, a conveying mechanism 3 connected to the feeding mechanisms 2, and an air mill unit 4 connected to the output end of the conveying mechanism 3; another conveying pipe 74 is connected to the air mill unit 4; the air mill unit 4 includes at least two air pumps 41, an air supply pipe 42 connected to the air pumps 41, a feeding pipe 43 for connecting the air supply pipe 42 to the feeding pipe 43 of the conveying mechanism 3, an air mill disc 45 for connecting the two conveying pipes 74, and an anti-backflow pipe 46 mounted on the air mill disc 45. Exhaust pipe 44; the exhaust pipe 44 is connected to another conveying pipe 74; the feed pipe 43 includes a material pipe 433 connected to the conveying mechanism 3, a first air inlet pipe 431 and a second air inlet pipe 432 located in the conveying pipe 74; wherein the material pipe 433, the first air inlet pipe 431 and the second air inlet pipe 432 are all funnel-shaped structures; the small end of the first air inlet pipe 431 is connected to the small end of the second air inlet pipe 432, the material pipe 433 is connected to the second air inlet pipe 432, and the material pipe 433 is at a predetermined distance from the small end of the second air inlet pipe 432.

[0066] The air grinding disc 45 includes an upper grinding disc 451 and a lower grinding disc 452, and a locking clamp 453 for connecting the upper grinding disc 451 and the lower grinding disc 452. Both the upper grinding disc 451 and the lower grinding disc 452 are provided with nozzle seats 454. After being locked by the locking clamp 453, the two nozzle seats 454 abut against each other, and an air grinding area is formed between the inner walls of the nozzle seats 454. There are nozzles 455 connected to the exhaust pipe 44 and the anti-backflow pipe 46 respectively and located in the air grinding area. There is a gap between the nozzles 455. There is a gap between the outer wall of the nozzle seat 454 and the upper grinding disc 451. The nozzle seat 454 is provided with ventilation holes in both the circumferential and radial directions. One conveying mechanism 3 conveys magnesium powder into the air grinding area through the ventilation holes in the circumferential direction of the nozzle seat 454, and the other conveying mechanism 3 conveys magnesium powder into the air grinding area through the ventilation holes in the radial direction of the nozzle seat 454.

[0067] When air milling is required, the feeding mechanism 2 and the conveying mechanism 3 work together to transport magnesium particles to a predetermined position. Then, through the operation of the air pump 41, high-speed gas carries the magnesium particles into the air milling disc 45. One of the conveying mechanisms 3 conveys magnesium powder to the air milling area through the circumferential air holes of the nozzle seat 454, and the other conveying mechanism 3 conveys magnesium powder to the air milling area through the radial air holes of the nozzle seat 454. The conveyed magnesium powder is then ground in the air milling area. With the movement of the recovery mechanism 6, magnesium powder that meets the requirements can be conveyed to the collection tank 8 along the conveying pipe 74, while magnesium powder that does not meet the requirements can fall into a predetermined position through the anti-backflow pipe 46. The magnesium powder particles that fall into the anti-backflow pipe 46 are large and difficult to extinguish after combustion.

[0068] Working principle description: During the oil filling process, lubricating oil at a certain temperature is filled from the second oil filling seat 53 into the first chamber 54. During this process, the exhaust valve is in the open state, and the lubricating oil at a certain temperature can be filled into the first chamber 54. After the exhaust valve is open for a predetermined time, it is closed, and then the low-temperature lubricating oil is injected into the first oil filling seat 52. When the low-temperature lubricating oil is filled into the first chamber 54, it can lift the movable seat 57 and move it in the first chamber 54. At this time, the low-temperature lubricating oil can flow into the first chamber 54, and then the movable seat 57 abuts against the first chamber 54. At this time, the oil injection pipe 58 can extend out of the oil guide seat 51, and then the lubricating oil at a certain temperature can be injected into the output shaft of the motor. As the amount of oil injected into the first oil filling seat 52 increases, the temperature of the lubricating oil in the first chamber 54 decreases, which can slowly reduce the temperature of the lubricating oil and prevent the motor from being damaged due to excessively low lubricating oil temperature.

[0069] By using the first driven part 71 and the second driven part 73 in cooperation, the first driven part 71 starts to work and completes the closing of one of the ball valves. After that, the excess gas can enter the second driven part 73 through the delivery pipe 74. Then the second driven part 73 starts to work, which can drive the other ball valve to start working, so that the other ball valve is in the closed state, thus preventing the magnesium powder in the collection tank 8 from being damaged when it burns.

[0070] After the magnesium powder in the collection tank 8 burns, the fan blades are stopped by adjusting the frequency conversion speed control mechanism. The combustion of magnesium powder generates significant heat, increasing the gas pressure inside the collection tank 8. The gas then flows along the housing 711 and guide channel 714 into the upper chamber. As the reaction intensifies, the pressure in the upper chamber gradually increases, pushing the movable block 715 to move within the connecting seat 712. The moving movable block 715 then drives the actuator to move, which in turn drives the guide seat 713 and its... When one ball valve starts to move, the moving guide seat 713 enables another guide channel 714 to connect with the space inside the box 711. Then, the gas can be transported along the delivery pipe 74 to the second driven part 73, thereby driving the other ball valve to start working. When one of the ball valves starts to work, it can cut off the channel between the collection tank 8 and the gas milling unit 4, preventing the flame from igniting the magnesium powder in the gas milling unit 4. The working state of the other ball valve changes with the pressure inside the collection tank 8, thereby disconnecting the recovery mechanism 6 from the collection tank 8 and preventing the flame from spreading.

[0071] When the movable block 715 starts to move, it can drive the push rod 716 to move. Then, the moving push rod 716 can drive the movable rod 718 to move. In turn, the moving movable rod 718 can drive the rocker arm 719 to rotate, which can drive the conveyor shaft 721 to rotate. Then, the moving conveyor shaft 721 can drive the valve stem 76 to move through the cooperation of the first bevel gear 726 and the second bevel gear 727, thereby driving the ball valve to work. During this process, the moving conveyor shaft 721 can drive the eccentric wheel 720 to rotate. The moving eccentric wheel 720 can drive the drive arm 723 to rotate, thereby causing the drive frame 724 to be in a swinging state. Then, the moving drive frame 724 can cause the piston rod 725 to move, adjusting the position of the guide seat 713.

[0072] With the cooperation of the feeding mechanism 2 and the conveying mechanism 3, magnesium particles can be transported to a predetermined position. Then, through the operation of the air pump 41, high-speed gas can carry magnesium particles into the air milling disc 45. Then, one of the conveying mechanisms 3 conveys magnesium powder to the air milling area through the circumferential air holes of the nozzle seat 454, and the other conveying mechanism 3 conveys magnesium powder to the air milling area through the radial air holes of the nozzle seat 454. The conveyed magnesium powder is then ground in the air milling area. With the movement of the recovery mechanism 6, magnesium powder that meets the requirements can be conveyed to the collection tank 8 along the conveying pipe 74.

[0073] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A variable frequency speed control device used in a magnesium powder air classifier mill, characterized in that, include: The recycling mechanism (6) generates negative pressure to draw the airflow containing qualified magnesium powder into the separation equipment, so that the magnesium powder settles in the collection tank (8); The oil injection unit (5) is installed on the recovery mechanism (6) and is used to inject lubricating oil into the recovery mechanism (6); The linkage unit (7) is located on the collection tank (8) and is used to adjust the negative pressure adsorption force between the recycling mechanism (6) and the collection tank (8); The recycling mechanism (6) includes a recycling pipe, two conveying pipes (74) respectively installed on the collection tank (8), an energy-saving motor connected to the recycling pipe, a variable frequency speed control mechanism connected to the energy-saving motor, and a fan blade connected to the energy-saving motor; One of the delivery pipes (74) is connected to the recycling pipe.

2. The variable frequency speed control device for use in a magnesium powder air jet mill according to claim 1, characterized in that: The oil injection unit (5) includes an oil guide seat (51) fixedly installed on the recovery pipe, a first chamber (54) built into the oil guide seat (51), a first oil injection seat (52) and a second oil injection seat (53) respectively disposed on the oil guide seat (51) and respectively communicating with the first chamber (54), a movable seat (57) built into the first chamber (54), an oil injection pipe (58) connected to the movable seat (57) and passing through the oil guide seat (51), and an exhaust valve disposed on the oil guide seat (51) and communicating with the first chamber (54); The movable seat (57) is provided with an L-shaped first connecting channel (571), which is connected to the fuel injection pipe (58) and the first chamber (54) respectively. Both the first oil injection seat (52) and the second oil injection seat (53) are provided with oil delivery channels. The first oil injection seat (52) is provided with a spray seat (56) at its outlet. The spray seat (56) is provided with a second chamber (55). The second chamber (55) is connected to the oil delivery channel, the oil delivery channel in the second oil injection seat (53) is connected to the first chamber (54), and the movable seat (57) abuts against the oil injection end of the spray seat (56).

3. The variable frequency speed control device for use in a magnesium powder air jet mill according to claim 2, characterized in that: The movable seat (57) gradually decreases in diameter along the direction close to the spray seat (56) to form a sealing end. The sealing end abuts against the spray seat (56). A sealing block (573) is preset inside the movable seat (57). An annular protrusion is also provided on the circumference of the sealing end. The end of the first chamber (54) away from the first oil filling seat (52) has a convex-shaped structure. A return spring (572) is used to connect the shoulder of the first chamber (54) and the annular protrusion. The sealing block (573) has elasticity and abuts against the spray base (56). The sealing block (573) abuts against the spray base (56) by a reset spring (572).

4. A variable frequency speed control device for use in a magnesium powder air jet mill according to claim 3, characterized in that: The oil guide seat (51) has a preheating cavity (59) inside, a preheating liquid inside the preheating cavity (59), and a heating element (510) located in the preheating cavity (59). There is an overlapping area between the preheating cavity (59) and the first chamber (54). The preheating cavity (59) preheats the lubricating oil in the first chamber (54).

5. A variable frequency speed control device for use in a magnesium powder air jet mill according to claim 4, characterized in that: The linkage unit (7) includes an adjustment seat (75) fixedly installed on the collection tank (8), a first driven part (71) and a second driven part (73) with the same structure symmetrically arranged on the adjustment seat (75), a delivery pipe (74) for connecting the first driven part (71) and the second driven part (73), a valve stem (76) connected to the first driven part (71) and the second driven part (73) respectively, and a ball valve provided in the two delivery pipes (74); The valve stem (76) is connected to the ball valve, thereby regulating the movement of the ball valve.

6. A variable frequency speed control device for use in a magnesium powder air jet mill according to claim 5, characterized in that: The first driven part (71) includes a box (711) and a connecting seat (712) fixed on the adjusting seat (75), a guide tube for connecting the box (711) and the collection tank (8), a guide seat (713) located in the box (711), a propulsion cavity opened in the connecting seat (712), a guide channel (714) provided in the box (711), a movable block (715) located in the propulsion cavity, and an actuator connected to the movable block (715); The movable block (715) divides the propulsion chamber into an upper chamber and a lower chamber, and the lower chamber is provided with an air inlet valve and an air outlet valve; One of the guide channels (714) is used to connect the box body (711) and the upper chamber, and the other guide channel (714) is connected to the outer wall of the connecting seat (712). The guide seat (713) is a U-shaped structure. By moving the actuator, the position of the guide seat (713) is changed, the transport direction of the airflow is guided, and the second driven part (73) is driven to move. The other guide channel (714) is connected to the delivery pipe (74).

7. A variable frequency speed control device for use in a magnesium powder air jet mill according to claim 6, characterized in that: The actuator includes a push rod (716) connected to the movable block (715), a slider (717) connected to the push rod (716) and the adjusting seat (75) respectively, a movable rod (718) movably connected to the slider (717), a rocker arm (719) connected to the output end of the movable rod (718) and rotatably connected to the adjusting seat (75), a conveying shaft (721) connected to the rocker arm (719), a first bevel gear (726) disposed on the conveying shaft (721), a second bevel gear (727) meshing with the first bevel gear (726), two eccentric wheels (720) respectively sleeved on the conveying shaft (721), two drive arms (723) connected to the eccentric wheels (720), a drive frame (724) for connecting the other end of the two drive arms (723), an arc-shaped groove opened on the drive frame (724), a drive block located in the arc-shaped groove, and a piston rod (725) connected to the drive block. The piston rod (725) is connected to the guide seat (713). Adjusting the position of the guide seat (713) completes the blocking of the guide channel (714). The orthographic projection direction of the two drive arms (723), and there is an angle between the two drive arms (723); The second bevel gear (727) is connected to the valve stem (76).

8. A variable frequency speed control device for use in a magnesium powder air jet mill according to claim 7, characterized in that: It also includes a workbench (1), two feeding mechanisms (2) set on the workbench (1), a conveying mechanism (3) connected to the feeding mechanism (2), and an air mill unit (4) connected to the output end of the conveying mechanism (3). Another delivery pipe (74) is connected to the air mill unit (4).

9. A variable frequency speed control device for use in a magnesium powder air jet mill according to claim 8, characterized in that: The air mill unit (4) includes at least two air pumps (41), an air supply pipe (42) connected to the air pumps (41), a feed pipe (43) for connecting the air supply pipe (42) and the conveying mechanism (3), an air mill disc (45) for connecting the two conveying pipes (74), and an anti-backflow pipe (46) and an exhaust pipe (44) provided on the air mill disc (45). The exhaust pipe (44) is connected to another delivery pipe (74); The feed pipe (43) includes a material pipe (433) connected to the conveying mechanism (3), a first air inlet pipe (431) and a second air inlet pipe (432) located in the conveying pipe (74); The material pipe (433), the first air inlet pipe (431), and the second air inlet pipe (432) are all funnel-shaped structures; The small end of the first air inlet pipe (431) is connected to the small end of the second air inlet pipe (432), and the material pipe (433) is connected to the second air inlet pipe (432) and is at a predetermined distance from the small end of the second air inlet pipe (432).

10. A variable frequency speed control device for use in a magnesium powder air classifier mill according to claim 9, characterized in that: The air grinding disc (45) includes an upper grinding disc (451) and a lower grinding disc (452), and a locking clamp (453) for connecting the upper grinding disc (451) and the lower grinding disc (452). Both the upper grinding disc (451) and the lower grinding disc (452) are provided with nozzle seats (454). After being locked by the locking clamp (453), the two nozzle seats (454) abut against each other. An air grinding area is formed between the inner walls of the nozzle seats (454), and nozzles (455) are respectively connected to the exhaust pipe (44) and the anti-backflow pipe (46) and located in the air grinding area. There are gaps between the nozzles (455). There is a gap between the outer wall of the nozzle seat (454) and the upper grinding disc (451), and the nozzle seat (454) is provided with ventilation holes in both the circumferential and radial directions; One of the conveying mechanisms (3) conveys magnesium powder into the air mill area through the circumferential vent of the nozzle seat (454), and the other conveying mechanism (3) conveys magnesium powder into the air mill area through the radial vent of the nozzle seat (454).

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