Frequency conversion speed regulating device of magnesium powder air flow mill

Abstract

The present application relates to the technical field of magnesium powder processing, and particularly relates to a variable frequency speed regulating device of a magnesium powder airflow mill, which comprises a magnesium powder airflow mill external component, a grading wheel component is internally installed in the magnesium powder airflow mill external component, and an auxiliary variable frequency speed regulating component is internally installed in the magnesium powder airflow mill external component. The present application moves the airflow mill positioning block by means of a sleeve ring frame, and better processes the auxiliary magnesium powder according to the environment and state of magnesium powder processing. When the rotating speed and airflow power are small, the carbon brush is clamped between every two external carbon sleeves, so that the magnesium powder material is prevented from being clamped to affect magnesium powder processing. When the carbon brush is away from the external carbon sleeve and the carbon pushing block is attached to the inner wall of the airflow mill shell, secondary friction is generated between the carbon pushing block and the magnesium powder adhered to the inner wall of the airflow mill shell, the characteristics of the carbon material are utilized to guide electrons, and thus the safety of magnesium powder processing is improved.

Description

Technical Field

[0001] This invention relates to the field of magnesium powder processing technology, and in particular to a variable frequency speed control device for magnesium powder air jet mill. Background Technology

[0002] Magnesium powder is a highly reactive metal powder (ignition point approximately 650℃, dust explosion limit 10-25 g / m³). 3 However, the ultrafine grinding (particle size <10μm) of magnesium powder requires an air jet mill, which mainly utilizes high-speed airflow to cause collisions and friction between particles to achieve grinding. Traditional air jet mills rely on a fixed-speed motor drive, which has problems such as low particle size control accuracy and high energy consumption. In contrast, the variable frequency speed control device adjusts the motor speed, that is, changes the airflow speed and the frequency of the classifier wheel, thereby achieving precise control of magnesium powder particle size and energy-saving operation.

[0003] However, in the existing air classifier mill, the variable frequency speed control device is used as a component to control the speed of the classifier wheel. During the operation, the speed of the classifier wheel is frequently changed. Magnesium powder is prone to collision with the inner wall of the air classifier mill or the classifier wheel during operation, which can easily generate static electricity. Therefore, safety issues are ignored when using variable frequency speed control for the classifier wheel. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background art by proposing a variable frequency speed control device for magnesium powder airflow mills.

[0005] The technical solution of the present invention: a variable frequency speed control device for a magnesium powder airflow mill, comprising an external component for the magnesium powder airflow mill, an internal component for a classifying wheel assembly, an internal component for an auxiliary variable frequency speed control assembly located directly below the classifying wheel assembly, an internal component for a variable frequency speed control assembly, and an auxiliary flow mill assembly installed at the bottom of the auxiliary variable frequency speed control assembly;

[0006] The external component of the magnesium powder airflow mill includes an airflow mill housing, a first motor is fixedly installed on the top of the airflow mill housing, and a bearing rod is fixedly installed on the output end of the first motor through the airflow mill housing;

[0007] The grading wheel assembly includes a grading fan blade fixedly installed on one side of the first motor passing through the air mill housing, and multiple external carbon sleeves are fixedly installed on the outer side of the grading fan blade.

[0008] The auxiliary frequency conversion speed control component includes a hollow fixed sleeve fixedly installed on the outside of the bearing rod, and a collar frame is slidably installed inside the hollow fixed sleeve.

[0009] The auxiliary flow mill assembly includes a flow mill positioning block fixedly installed at the bottom of the collar frame. A carbon pusher block is fixedly installed on the side of the flow mill positioning block away from the external carbon sleeve, and a carbon brush is fixedly installed on the side of the flow mill positioning block facing the external carbon sleeve. The flow mill positioning block is inserted into the slot between every two external carbon sleeves.

[0010] Optionally, the external component of the magnesium powder air jet mill also includes a feed pipe fixedly installed on one side above the air jet mill housing. A wind power supply box is fixedly installed at the bottom of the air jet mill housing, and a discharge pipe is fixedly installed on one side of the wind power supply box, with the discharge pipe located directly below the feed pipe.

[0011] Optionally, an airflow conduction component is installed at the bottom of the external component of the magnesium powder airflow mill, and the airflow conduction component and the classifying wheel component are controlled by a variable frequency speed control component.

[0012] Optionally, the hollow fixed sleeve is located directly above the feed pipe, and an auxiliary disc is rotatably installed at the bottom of the hollow fixed sleeve. Multiple through arc-shaped guide rails are opened inside the auxiliary disc, and a transmission column is slidably installed inside the arc-shaped guide rails. The collar frame is fixedly installed on the outside of the transmission column.

[0013] Optionally, a collar plate is fixedly installed at one end of the auxiliary disk inside the hollow fixed sleeve, and a toothed arc edge is fixedly installed at one end of the collar plate passing through the hollow fixed sleeve. The toothed arc edge is slidably installed on the top of the hollow fixed sleeve.

[0014] Optionally, a gear is meshed with the outer side of the tooth arc edge, and the gear is rotatably mounted on the top of the air jet mill housing.

[0015] Optionally, the number of the collar frames is multiple sets, and the multiple sets of collar frames are arranged in a ring shape about the surface of the hollow fixed sleeve frame.

[0016] Optionally, the airflow conduction assembly includes a main fan located at the bottom of the wind power supply box, and multiple airflow ducts are fixedly installed on the outside of the main fan, with the airflow ducts connected to the wind power supply box.

[0017] Optionally, an airflow transmission assembly is fixedly installed on the top of the main fan, the bearing rod is rotatably installed on the top of the airflow transmission assembly, and a laser particle size analyzer is fixedly installed at the center of the airflow transmission assembly and the bearing rod.

[0018] Optionally, the milling positioning block is adapted to the slot between every two external carbon sleeves, and the number of milling positioning blocks is multiple sets, which are arranged in a ring shape when they are attached to the outer wall of the carbon pushing block.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. The positioning block of the flow mill is moved by the collar frame. According to the environment and state of magnesium powder processing, the magnesium powder is assisted to be processed better. When the speed and airflow power are low, the carbon brush is stuck between every two external carbon sleeves, which avoids the magnesium powder material from getting stuck and affecting the magnesium powder processing. When the carbon brush moves away from the external carbon sleeve and the carbon push block is attached to the inner wall of the flow mill shell, the carbon push block generates secondary friction with the magnesium powder stuck to the inner wall of the flow mill shell. The properties of carbon material are used to guide electrons, thereby improving the safety of magnesium powder processing.

[0021] 2. When the amount of magnesium powder input is small, the magnesium powder is first crushed into smaller particles by impact through the sealed environment formed by the flow mill positioning block and the classifying wheel assembly. This reduces the power of the equipment during magnesium powder processing, making the power of the equipment more suitable for the amount of magnesium powder input, and reducing the corresponding production cost of magnesium powder.

[0022] 3. The size of the detected particles is transmitted to the frequency converter, which in turn uses the PLC to dynamically adjust the frequency of the grading wheel assembly and the main fan based on the particle size deviation and pressure difference signal, thereby improving the processing quality of magnesium powder. Attached Figure Description

[0023] Figure 1 A schematic diagram of the variable frequency speed control device for a magnesium powder airflow mill;

[0024] Figure 2 This is a schematic diagram of the structure of the air jet mill housing of the present invention;

[0025] Figure 3 This is a schematic diagram of the auxiliary frequency conversion speed control component of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of region A in the middle;

[0027] Figure 5 This is a schematic diagram of the bearing rod structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the collar frame of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the graded fan blades of the present invention;

[0030] Figure 8 for Figure 7 Enlarged view of region B in the middle.

[0031] Reference numerals in the attached diagram: 1. External component of magnesium powder air jet mill; 101. Air jet mill outer shell; 102. Discharge pipe; 103. Feed pipe; 104. Air supply box; 105. First motor; 106. Bearing rod; 2. Grading wheel assembly; 201. External carbon sleeve; 202. Grading fan blade; 3. Auxiliary frequency conversion speed regulation assembly; 301. Hollow fixed sleeve; 302. Gear; 303. Gear tooth arc edge; 304. Collar frame; 305. Auxiliary disc; 306. Arc guide rail; 307. Conducting column; 308. Collar plate; 4. Airflow conduction assembly; 401. Airflow duct; 402. Main fan; 403. Laser particle size analyzer; 404. Airflow transmission assembly; 5. Auxiliary air jet mill assembly; 501. Air jet mill positioning block; 502. Carbon pusher block; 503. Carbon brush. Detailed Implementation

[0032] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0034] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] like Figures 1 to 4As shown, the variable frequency speed control device for the magnesium powder airflow mill proposed in this invention includes an external component 1 for the magnesium powder airflow mill, a classifier wheel assembly 2 installed inside the external component 1, an auxiliary variable frequency speed control component 3 installed inside the external component 1, the auxiliary variable frequency speed control component 3 being located directly below the classifier wheel assembly 2, an auxiliary flow mill assembly 5 installed at the bottom of the auxiliary variable frequency speed control component 3.

[0038] The external component 1 of the magnesium powder air classifier includes an air classifier housing 101. A first motor 105 is fixedly installed on the top of the air classifier housing 101. A bearing rod 106 is fixedly installed on the output end of the first motor 105 through the air classifier housing 101. The external component 1 of the magnesium powder air classifier also includes a feed pipe 103 fixedly installed on one side above the air classifier housing 101. A wind power supply box 104 is fixedly installed on the bottom of the air classifier housing 101. A discharge pipe 102 is fixedly installed on one side of the wind power supply box 104. The discharge pipe 102 is located directly below the feed pipe 103.

[0039] The grading wheel assembly 2 includes a grading fan blade 202 fixedly installed on one side of the first motor 105 passing through the air mill housing 101. Multiple external carbon sleeves 201 are fixedly installed on the outside of the grading fan blade 202. An airflow conduction assembly 4 is installed at the bottom of the magnesium powder air mill external assembly 1. The airflow conduction assembly 4 and the grading wheel assembly 2 are controlled by a frequency conversion speed regulation assembly.

[0040] Furthermore, the magnesium powder material is transported from the feed pipe 103 to the inside of the classifying wheel assembly 2 for processing. As the first motor 105 drives the bearing rod 106 to rotate along the airflow mill housing 101, the magnesium powder material is fed into the classifying fan blades 202 and the external carbon sleeve 201. As the airflow conduction assembly 4 provides airflow to impact the magnesium powder particles inside the classifying wheel assembly 2, grinding occurs between the magnesium powder particles and the external carbon sleeve 201. At the same time, the frequency conversion speed control assembly adjusts the rotation speed of the bearing rod 106 driven by the first motor 105 to further adjust the processing quality of the magnesium powder.

[0041] As one implementation method, such as Figures 5 to 8As shown, in this embodiment, the auxiliary frequency conversion speed control component 3 includes a hollow fixed sleeve 301 fixedly installed on the outside of the bearing rod 106. A collar frame 304 is slidably installed inside the hollow fixed sleeve 301. The hollow fixed sleeve 301 is located directly above the feed pipe 103. An auxiliary disc 305 is rotatably installed at the bottom of the hollow fixed sleeve 301. Multiple through arc-shaped guide rails 306 are opened inside the auxiliary disc 305. A conduction column 307 is slidably installed inside the arc-shaped guide rails 306. The collar frame 304 is fixedly installed outside the conduction column 307. On the side, an auxiliary disc 305 is fixedly installed with a collar plate 308 at one end inside the hollow fixed sleeve 301. A gear tooth arc edge 303 is fixedly installed at one end of the collar plate 308 passing through the hollow fixed sleeve 301. The gear tooth arc edge 303 is slidably installed on the top of the hollow fixed sleeve 301. A gear 302 is meshed with the outer side of the gear tooth arc edge 303. The gear 302 is rotatably installed on the top of the airflow mill housing 101. There are multiple sets of collar frames 304, and the multiple sets of collar frames 304 are arranged in a ring shape about the surface of the hollow fixed sleeve 301.

[0042] Furthermore, when the variable frequency speed control component adjusts the speed of the bearing rod 106 driven by the first motor 105, or when auxiliary processing is required according to the magnesium powder processing situation, the second motor, which is fixedly installed on the top of the air jet mill housing 101, is a reversible motor. The reversible motor drives the gear 302 to rotate. The gear 302 meshes with the tooth arc edge 303, causing the tooth arc edge 303 and the auxiliary disk 305 to rotate clockwise along the bearing rod 106. Since the transmission column 307 is wrapped and positioned by the collar frame 304, the transmission column 307 can only move along the air jet mill housing 106. The hollow fixed sleeve 301 slides back and forth, so the transmission column 307 moves inward along the arc-shaped track of the arc-shaped guide rail 306, while the collar frame 304 slides inward along the hollow fixed sleeve 301. If the forward and reverse motor drives the gear 302 to rotate in the opposite direction, the gear 302 will drive the arc-shaped track of the gear teeth 303 and the auxiliary disk 305 to rotate counterclockwise along the bearing rod 106 by meshing with the arc-shaped track of the gear teeth 303. Similarly, the transmission column 307 moves outward along the arc-shaped track of the arc-shaped guide rail 306, while the collar frame 304 slides outward along the hollow fixed sleeve 301.

[0043] It is worth noting that the auxiliary flow mill assembly 5 includes a flow mill positioning block 501 fixedly installed at the bottom of the collar frame 304. A carbon pusher block 502 is fixedly installed on the side of the flow mill positioning block 501 away from the outer carbon sleeve 201, and a carbon brush 503 is fixedly installed on the side of the flow mill positioning block 501 facing the outer carbon sleeve 201. The flow mill positioning block 501 is inserted into the slot between every two outer carbon sleeves 201, and the flow mill positioning block 501 is adapted to the slot between every two outer carbon sleeves 201. There are multiple sets of flow mill positioning blocks 501. When multiple sets of flow mill positioning blocks 501 are attached to the outer wall of the carbon pusher block 502, they are arranged in a ring shape. The amount of magnesium powder added is not fixed. When the amount of magnesium powder added is small, if a high rotation speed and airflow processing are still maintained, a certain amount of magnesium powder will be consumed. To reduce costs, the collar frame 304 drives the flow mill positioning block 501 to move towards the external carbon sleeve 201 until the carbon brush 503 is inserted between every two external carbon sleeves 201, forming a relatively sealed container. At this time, with the airflow impact of the airflow conduction component 4 and the rotation of the classifying wheel component 2, the magnesium powder rotates and collides, causing it to collide with each other first, so that the magnesium powder is first crushed into smaller particles, reducing the pressure of initial crushing of the magnesium powder. At the same time, when the rotation speed and airflow power are low, the magnesium powder particles are large and are easy to get stuck between every two external carbon sleeves 201 at low rotation speed. Therefore, as the carbon brush 503 is stuck between every two external carbon sleeves 201, the situation of magnesium powder material getting stuck and affecting magnesium powder processing is avoided.

[0044] Furthermore, as the carbon brush 503 comes into contact with the outer wall of the external carbon sleeve 201, it can remove any remaining or excess material that may be blocking the pipe, reducing the workload of cleaning the inside of the pipe for staff later.

[0045] Meanwhile, since magnesium powder is prone to generating static electricity through friction with the inner wall of the external carbon sleeve 201 and the air jet mill outer shell 101, and the outer layer of the graded fan blade 202 is made of carbon material, it can reduce the static electricity generated by magnesium powder friction.

[0046] As the airflow pushes the magnesium powder for processing and the grading wheel assembly 2 rotates, some of the magnesium powder will be subjected to centrifugal force and friction against the inner wall of the airflow mill housing 101. When the airflow mill positioning block 501 rotates with the hollow fixed sleeve 301, the carbon pushing block 502 will come into contact with the inner wall of the airflow mill housing 101. The two rub against each other, and the carbon pushing block 502 generates secondary friction with the magnesium powder stuck to the inner wall of the airflow mill housing 101. By utilizing the properties of carbon materials, electrons are guided, thereby improving the safety of magnesium powder processing.

[0047] Among them, such as Figures 6 to 8As shown, the airflow transmission assembly 4 includes a main fan 402 located at the bottom of the wind supply box 104. Multiple airflow ducts 401 are fixedly installed on the outside of the main fan 402, communicating with the wind supply box 104. An airflow transmission component 404 is fixedly installed on the top of the main fan 402. A bearing rod 106 is rotatably mounted on the top of the airflow transmission component 404. A laser particle size analyzer 403 is fixedly installed between the airflow transmission component 404 and the bearing rod 106. When magnesium powder particles pass through the laser beam of the laser particle size analyzer 403, the scattering angle of light differs due to the different particle sizes of the magnesium powder (smaller particles scatter at a larger angle, and larger particles scatter at a smaller angle). The laser particle size analyzer 403 is equipped with a ring photodiode, which captures the distribution of scattered light intensity. The magnesium powder, suspended in the airflow, passes through the detection zone at a velocity of 0.5 m / s to 1 m / s. It should be noted that the ring-arranged photodiodes are typically 32... -64 light signals are captured at scattering angles of 0.02°-40° and converted into particle size distribution data. If the detected particles are >1μm, the frequency of the airflow transmission component 404 is increased by 3Hz, thereby increasing the airflow speed from 250m / s to 270m / s, thus enhancing particle collision. If the magnesium powder particles are <-0.5μm, that is, they are too pulverized, the fan frequency is reduced, such as by 5Hz. At the same time, a pressure sensor is installed inside the airflow mill housing 101. The pressure sensor detects the pressure difference between the inner wall of the airflow mill housing 101 and the classifying wheel assembly 2. The pressure difference reflects the particle concentration. The pressure sensor and the laser particle size analyzer 403 transmit the particle size deviation and pressure difference signals to the frequency conversion adjustment component. The frequency conversion adjustment component outputs a 4mA-20mA current signal to the frequency converter through the PLC according to the particle size deviation and pressure difference signals. The frequency converter dynamically adjusts the frequency of the classifying wheel assembly 2 and the main fan 402.

[0048] Meanwhile, the airflow duct 401 is equipped with an ion wind static eliminator, which, together with the auxiliary flow mill assembly 5, further reduces the static electricity generated in the processing area of ​​the flow mill housing 101.

[0049] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A variable frequency speed control device for a magnesium powder air jet mill, comprising an external component (1) for the magnesium powder air jet mill, characterized in that, The external component (1) of the magnesium powder airflow mill is equipped with a classifying wheel assembly (2), and the external component (1) of the magnesium powder airflow mill is equipped with an auxiliary variable frequency speed control assembly (3). The auxiliary variable frequency speed control assembly (3) is located directly below the classifying wheel assembly (2). The external component (1) of the magnesium powder airflow mill is equipped with a variable frequency speed control assembly, and the bottom of the auxiliary variable frequency speed control assembly (3) is equipped with an auxiliary flow mill assembly (5). The external component (1) of the magnesium powder airflow mill includes an airflow mill housing (101), a first motor (105) is fixedly installed on the top of the airflow mill housing (101), and a bearing rod (106) is fixedly installed on the output end of the first motor (105) through the airflow mill housing (101). The grading wheel assembly (2) includes a grading fan blade (202) fixedly installed on one side of the first motor (105) passing through the air mill housing (101), and multiple external carbon sleeves (201) are fixedly installed on the outer side of the grading fan blade (202). The auxiliary frequency conversion speed control component (3) includes a hollow fixed sleeve (301) fixedly installed on the outside of the bearing rod (106), and a collar frame (304) is slidably installed inside the hollow fixed sleeve (301). The auxiliary flow mill assembly (5) includes a flow mill positioning block (501) fixedly installed at the bottom of the collar frame (304). A carbon pusher block (502) is fixedly installed on the side of the flow mill positioning block (501) away from the external carbon sleeve (201). A carbon brush (503) is fixedly installed on the side of the flow mill positioning block (501) facing the external carbon sleeve (201). The flow mill positioning block (501) is inserted into the slot between every two external carbon sleeves (201). An auxiliary disc (305) is rotatably mounted on the bottom of the hollow fixed sleeve (301). Multiple through arc-shaped guide rails (306) are provided inside the auxiliary disc (305). A conduction column (307) is slidably mounted inside the arc-shaped guide rails (306). A collar frame (304) is fixedly mounted on the outside of the conduction column (307). A collar plate (308) is fixedly mounted on one end of the auxiliary disc (305) inside the hollow fixed sleeve (301). A toothed arc edge (303) is fixedly mounted on one end of the collar plate (308) passing through the hollow fixed sleeve (301). The toothed arc edge (303) is slidably mounted on the top of the hollow fixed sleeve (301).

2. The variable frequency speed control device for the magnesium powder airflow mill according to claim 1, characterized in that, The external component (1) of the magnesium powder air jet mill also includes a feed pipe (103) fixedly installed on one side above the air jet mill housing (101). A wind power supply box (104) is fixedly installed at the bottom of the air jet mill housing (101). A discharge pipe (102) is fixedly installed on one side of the wind power supply box (104). The discharge pipe (102) is located directly below the feed pipe (103).

3. The variable frequency speed control device for the magnesium powder airflow mill according to claim 1, characterized in that, The bottom of the external component (1) of the magnesium powder airflow mill is equipped with an airflow conduction component (4), and the airflow conduction component (4) and the grading wheel component (2) are controlled by a variable frequency speed control component.

4. The variable frequency speed control device for the magnesium powder airflow mill according to claim 2, characterized in that, The hollow fixed sleeve (301) is located directly above the feed pipe (103).

5. The variable frequency speed control device for the magnesium powder airflow mill according to claim 4, characterized in that, The number of the collar brackets (304) is multiple sets, and the multiple sets of collar brackets (304) are arranged in a ring shape with respect to the surface of the hollow fixed sleeve bracket (301).

6. The variable frequency speed control device for the magnesium powder airflow mill according to claim 3, characterized in that, The airflow transmission assembly (4) includes a main fan (402) located at the bottom of the wind power supply box (104). Multiple airflow ducts (401) are fixedly installed on the outside of the main fan (402). The airflow ducts (401) are connected to the wind power supply box (104).

7. The variable frequency speed control device for the magnesium powder airflow mill according to claim 6, characterized in that, An airflow transmission assembly (404) is fixedly installed on the top of the main fan (402), and a bearing rod (106) is rotatably installed on the top of the airflow transmission assembly (404). A laser particle size analyzer (403) is fixedly installed in the center between the airflow transmission assembly (404) and the bearing rod (106).

8. The variable frequency speed control device for the magnesium powder airflow mill according to claim 1, characterized in that, The milling positioning block (501) is adapted to the slot between each pair of external carbon sleeves (201). There are multiple sets of milling positioning blocks (501). When multiple sets of milling positioning blocks (501) are attached to the outer wall of the carbon pusher block (502), they are arranged in a ring shape.

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