Grinding device for fine screening of magnetic powder

Abstract

The invention relates to the field of ore processing, in particular to a grinding device for fine screening of magnetic powder. The technical problems that according to an existing magnetic powder grinding device, fine magnetic powder and large-particle magnetic ore are difficult to separate in the grinding process of magnetic ore particles, the fine magnetic powder is repeatedly ground, the pressure of a grinding head on the magnetic ore particles is fixed in the grinding process, and the grinding efficiency is low are solved. A grinding device for fine screening of magnetic powder comprises a shell. Two electric hydraulic cylinders are fixedly connected in the shell, a grinding head is fixedly connected between telescopic rods of the two electric hydraulic cylinders, and a cavity is formed in the grinding head. Magnetic powder in the grinding vessel is pumped away through the powder pumping pipe through the adapter and the grinding head cavity, the ejector rod is extruded to drive the grinding vessel to move in the direction close to the grinding head, in this way, the finely-ground magnetic powder and large-particle magnetic ore can be conveniently and rapidly separated, the extrusion force of the grinding head on the magnetic ore can be increased, and the grinding efficiency is improved. Therefore, the grinding efficiency of the magnetic ore is improved.

Description

Technical Field

[0001] The invention relates to the field of ore processing, and in particular to a grinding device for fine screening of magnetic powder. Background Art

[0002] Magnetic powder is a kind of hard magnetic single-domain particle. It is made into magnetic slurry with adhesives, solvents, etc., and coated on the surface of plastic or metal substrates (supports) to make magnetic recording materials such as magnetic tapes, disks, and magnetic cards. In the process of preparing magnetic materials, magnetic materials such as magnetic ore particles are often ground into granular powders. Magnetic powder is the core component of magnetic coatings and is the main factor that determines the magnetic properties of magnetic recording media. However, in the existing magnetic powder grinding device, it is difficult to separate finely ground magnetic powder and large-particle magnetic ore during the grinding process of magnetic ore particles, so that fine magnetic powder is repeatedly ground and easily over-ground. In addition, the pressure of the grinding head on the magnetic ore particles is fixed during the grinding process, resulting in low grinding efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a grinding device for fine screening of magnetic powder, which can separate finely ground magnetic powder from large-particle magnetic ore more conveniently and quickly by means of air extraction, and the grinding dish can reciprocate to increase the squeezing force of the grinding head on the magnetic ore, thereby improving the grinding efficiency of the magnetic ore.

[0004] Technical solution: A grinding device for fine screening of magnetic powder, comprising a shell, two electric hydraulic cylinders fixedly connected in the shell, a grinding head fixedly connected between the telescopic rods of the two electric hydraulic cylinders, a cavity opened inside the grinding head, a powder extraction pipe fixedly connected to the grinding head, the powder extraction pipe is connected to the internal cavity of the grinding head, a grinding dish is rotatably connected inside the shell, a motor is fixedly connected in the shell, the motor output shaft is slidably connected to the grinding dish, a powder suction control component is provided on the grinding head, the powder suction control component is used to control the connection between the grinding dish and the internal cavity of the grinding head, a grinding auxiliary component is provided in the shell, the grinding auxiliary component is used to strengthen the grinding pressure of the grinding head on the magnetic powder and improve the grinding efficiency.

[0005] In addition, it is particularly preferred that the powder suction control component includes an adapter, which is rotatably connected to the grinding head, and two column gears 1 are fixedly connected to the adapter, and the two column gears 1 are symmetrically arranged, and two sliding gear rods 1 are slidably connected to the grinding head, and the lower part of the sliding gear rod is meshed with the column gear 1, and a reset spring is connected between the two sliding gear rods 1 and the grinding head, and two column gears 2 are rotatably connected to the grinding head, and the upper part of the sliding gear rod 1 is meshed with the column gear 2, and two fixed gear rods are fixedly connected in the outer shell, and the fixed gear rods are meshed with the column gear 2.

[0006] In addition, it is particularly preferred that a plurality of curved holes are opened in the adapter.

[0007] Furthermore, it is particularly preferred that the powder extraction tube is retractable.

[0008] In addition, it is particularly preferred that the grinding auxiliary component includes a push rod, two of the push rods are fixedly connected to the grinding plate, the two push rods are symmetrically arranged, a top ring is fixedly connected to the outer shell, and a tension spring is connected between the grinding plate and the outer shell.

[0009] In addition, it is particularly preferred that a hammering component is provided on the outer shell, and the hammering component is used to hammer the grinding dish to separate the small-particle magnetic powder and the large-particle magnetic powder in the grinding dish, so that the small-particle magnetic powder can be better sucked away by the powder extraction tube, thereby improving the grinding efficiency. The hammering component includes a mounting plate, and two mounting plates are fixedly connected to the outer shell, each of the mounting plates is rotatably connected to a pendulum, and a torsion spring is connected between the pendulum and the mounting plate, an overrunning clutch is fixedly connected to the grinding dish, and a top plate is fixedly connected to the overrunning clutch.

[0010] In addition, it is particularly preferred that a scraping component is provided in the grinding head, and the scraping component is used to scrape off the magnetic powder adsorbed on the inner wall of the grinding head cavity to avoid accumulation of magnetic powder in the grinding head cavity, and the scraping component includes a scraping ring, the scraping ring is rotatably connected in the grinding head, and a column gear three is fixedly connected to the scraping ring, a sliding gear rod two is slidably connected in the grinding head, a limiting groove is formed on the sliding gear rod two, a pressure spring is connected between the sliding gear rod two and the grinding head, and a limiting rod is slidably connected in the grinding head, and the limiting rod is fixedly connected to one of the sliding gear rods one.

[0011] In addition, it is particularly preferred that a feed hopper is further included, and the feed hopper is fixedly connected to the grinding plate.

[0012] Beneficial effects: 1. When the sliding gear rod moves, it will mesh with the column gear, causing the column gear to rotate. When the column gear rotates, the adapter will rotate 180 degrees, so that the cavity of the grinding head will be connected to the grinding dish. The user can use the powder extraction tube to extract the magnetic powder in the grinding dish through the adapter and the cavity of the grinding head. During the rotation of the grinding dish, the push rod will contact the top ring, and the top ring will squeeze the push rod. The push rod will drive the grinding dish to move toward the grinding head due to the squeezing. In this way, the finely ground magnetic powder can be quickly separated from the large-particle magnetic ore, and the reciprocating movement of the grinding dish will increase the squeezing force of the grinding head on the magnetic ore, thereby improving the grinding efficiency of the magnetic ore.

[0013] 2. The rotation of the top plate will hit the pendulum, which will swing away from the grinding dish when hit. The torsion spring will be twisted. After the top plate and the pendulum are separated, the torsion spring will reset and drive the pendulum to reset. The pendulum will hammer the outer wall of the grinding dish, causing the magnetic ore particles in the grinding dish to vibrate. During the vibration of the magnetic ore particles, the finely ground magnetic powder will be better separated from the large-particle magnetic ore particles. In this way, the efficiency of extracting magnetic powder can be improved.

[0014] 3. The sliding gear rod 2 will mesh with the column gear 3, so that the column gear 3 will rotate. The rotation of the column gear 3 will drive the scraper ring to rotate. The rotation of the scraper ring will scrape the inner wall of the cavity of the grinding head, and then scrape off the magnetic powder attached to the inner wall of the cavity of the grinding head. In this way, the magnetic powder adsorbed on the inner wall of the cavity of the grinding head can be scraped off, avoiding the accumulation of magnetic powder in the cavity of the grinding head, and further improving the efficiency of magnetic powder extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0016] Figure 2 It is a schematic diagram of a first cross-sectional three-dimensional structure of the housing of the present invention.

[0017] Figure 3 It is a schematic diagram of a second cross-sectional three-dimensional structure of the housing of the present invention.

[0018] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged three-dimensional structure at point A.

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the grinding head, grinding dish and powder extraction tube of the present invention.

[0020] Figure 6 This is a schematic diagram of a first cross-sectional stereoscopic structure of the grinding head of the present invention.

[0021] Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the adapter of the present invention.

[0022] Figure 8 It is a third cross-sectional three-dimensional structural schematic diagram of the housing of the present invention.

[0023] Fig. 9 It is a schematic diagram of a second cross-sectional stereoscopic structure of the grinding head of the present invention.

[0024] Fig.10 This is a schematic diagram of a third cross-sectional stereoscopic structure of the grinding head of the present invention.

[0025] Fig.11 This is a fourth cross-sectional stereoscopic structural schematic diagram of the grinding head of the present invention.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. housing, 2. electric hydraulic cylinder, 3. grinding head, 4. powder extraction tube, 5. grinding dish, 6. motor, 71. adapter, 72. column gear one, 73. sliding gear rod one, 74. reset spring, 75. column gear two, 76. fixed gear rod, 81. push rod, 82. top ring, 83. tension spring, 91. mounting plate, 92. pendulum, 93. torsion spring, 94. overrunning clutch, 95. top plate, 101. scraper ring, 102. column gear three, 103. sliding gear rod two, 104. pressure spring, 105. limit rod, 11. feed hopper. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0028] Embodiment 1: A grinding device for fine screening of magnetic powder, such as Figure 1-Figure 11 As shown, it includes a shell 1, two electric hydraulic cylinders 2 are fixedly connected in the shell 1, a grinding head 3 is fixedly connected between the telescopic rods of the two electric hydraulic cylinders 2, the grinding head 3 is used to grind magnetic ore particles, a cavity is opened inside the grinding head 3, a powder extraction pipe 4 is fixedly connected to the grinding head 3, the powder extraction pipe 4 is used to extract fine magnetic powder and magnetic ore particles, the powder extraction pipe 4 is connected to the internal cavity of the grinding head 3, a grinding dish 5 is rotatably connected inside the shell 1, the grinding dish 5 is used to cooperate with the grinding head 3 to grind magnetic ore particles, a motor 6 is fixedly connected in the shell 1, the output shaft of the motor 6 is slidably connected to the grinding dish 5, a powder suction control component is provided on the grinding head 3, the powder suction control component is used to control the communication between the grinding dish 5 and the internal cavity of the grinding head 3, a grinding auxiliary component is provided in the shell 1, the grinding auxiliary component is used to strengthen the grinding pressure of the grinding head 3 on the magnetic powder, and improve the grinding efficiency.

[0029] The powder suction control component includes an adapter 71, which is rotatably connected to the grinding head 3. Two column gears 72 are fixedly connected to the adapter 71, and the two column gears 72 are symmetrically arranged. Two sliding gear rods 73 are slidably connected to the grinding head 3, and the lower part of the sliding gear rod 73 is meshed with the column gear 72. A reset spring 74 is connected between the two sliding gear rods 73 and the grinding head 3. Two column gears 75 are rotatably connected to the grinding head 3, and the upper part of the sliding gear rod 73 is meshed with the column gear 75. Two fixed gear rods 76 are welded in the housing 1, and the fixed gear rods 76 are meshed with the column gear 75. The rotation of the column gear 72 will drive the adapter 71 to rotate, thereby switching the connection state between the cavity in the grinding head 3 and the grinding dish 5.

[0030] The adapter 71 has a plurality of curved holes therein, through which the fine magnetic powder in the grinding dish 5 can be drawn into the cavity of the grinding head 3 .

[0031] The powder extraction tube 4 is retractable and can better adapt to the movement of the grinding head.

[0032] The grinding auxiliary component includes a push rod 81. Two push rods 81 are welded on the grinding plate 5. The two push rods 81 are symmetrically arranged. A top ring 82 is fixedly welded on the outer shell 1. The top ring 82 is located below the push rod 81. A tension spring 83 is connected between the grinding plate 5 and the outer shell 1. When the push rod 81 is squeezed, it will drive the grinding plate 5 to move towards the grinding head 3, increase the squeezing force of the grinding head 3 on the magnetic ore, and thus improve the grinding efficiency.

[0033] At first, the fixed gear rod 76 is meshed with the column gear 2 75, the return spring 74 is compressed, and the adapter 71 separates the cavity of the grinding head 3 from the grinding plate 5. During operation, the user starts the electric hydraulic cylinder 2, and the telescopic rod of the electric hydraulic cylinder 2 is shortened, which drives the grinding head 3 to move away from the grinding plate 5. The movement of the grinding head 3 will cause the column gear 2 75 to move, and the column gear 2 75 will mesh with the fixed gear rod 76, so that the column gear 2 75 will rotate. The rotation of the column gear 2 75 will mesh with the sliding gear rod 1 73, so that the sliding gear rod 1 73 will extend out of the grinding head 3. The movement of the sliding gear rod 1 73 will mesh with the column gear 1 72, so that the column gear 1 72 rotates. The rotation of wheel 1 72 will cause the adapter to rotate 180 degrees, so that the cavity of the grinding head 3 will be connected to the grinding dish 5, the reset spring 74 will reset, and the telescopic rod of the electric hydraulic cylinder 2 will stop shortening. At this time, the grinding head 3 has not yet separated from the inner wall of the grinding dish 5. The user can use the powder extraction pipe 4 to extract the magnetic powder in the grinding dish 5 through the adapter 71 and the cavity of the grinding head 3. The telescopic rod of the electric hydraulic cylinder 2 continues to shorten, the column gear 2 75 and the fixed gear rod 76 are separated, and the grinding head 3 continues to move away from the grinding dish 5, so that the grinding head 3 and the grinding dish 5 are separated. After the grinding head 3 continues to move a certain distance, the telescopic rod of the electric hydraulic cylinder 2 stops moving, and the user can pass the magnetic ore particles to be ground through the feed hopper 11 is poured into the grinding dish 5, and then the user starts the motor 6 and extends and resets the telescopic rod of the electric hydraulic cylinder 2, and the output shaft of the motor 6 rotates, and the rotation of the output shaft of the motor 6 drives the grinding dish 5 to rotate, and the telescopic rod of the electric hydraulic cylinder 2 extends and resets to drive the grinding head 3 to reset, and the reset of the grinding head 3 drives the column gear 2 75 to reset, and the column gear 2 75 will mesh with the fixed gear rod 76 again, so that the column gear 2 75 is reversed, and the reverse rotation of the column gear 2 75 drives the sliding gear rod 1 73 to reset, and the reset of the sliding gear rod 1 73 will mesh with the column gear 1 72, so that the column gear 1 72 is reversed, and the reverse rotation of the column gear 1 72 drives the adapter 71 to reverse 180 degrees, thereby isolating the cavity of the grinding head 3 from the grinding dish 5. The telescopic rod of the hydraulic cylinder 2 stops extending. During the rotation of the grinding dish 5, the magnetic ore particles in the grinding dish 5 will be squeezed and ground by the grinding head 3. During the rotation of the grinding dish 5, the push rod 81 will contact the top ring 82, and the top ring 82 will squeeze the push rod 81. The squeezing of the push rod 81 will drive the grinding dish 5 to move toward the grinding head 3. The tension spring is stretched. After the top ring 82 and the push rod 81 are separated, the tension spring 83 is reset to drive the grinding dish 5 to reset. This reciprocating movement can quickly and conveniently separate the finely ground magnetic powder from the large-particle magnetic ore in this way. The reciprocating movement of the grinding dish 5 will increase the squeezing force of the grinding head 3 on the magnetic ore, thereby improving the grinding efficiency of the magnetic ore.

[0034] Embodiment 2: Based on embodiment 1, Figure 3-Figure 9As shown, the shell 1 is provided with a hammering component, which is used to hammer the grinding dish 5, so as to separate the small-particle magnetic powder and the large-particle magnetic powder in the grinding dish 5, so that the small-particle magnetic powder can be better sucked away by the powder extraction tube 4, thereby improving the grinding efficiency. The hammering component includes a mounting plate 91, and two mounting plates 91 are welded in the shell 1. Each mounting plate 91 is rotatably connected with a pendulum 92, and a torsion spring 93 is connected between the pendulum 92 and the mounting plate 91. An overrunning clutch 94 is fixedly connected to the grinding dish 5, and a top plate 95 is fixedly connected to the overrunning clutch 94. The top plate 95 rotates to hit the pendulum 92, and the pendulum 92 is hit and swings away from the grinding dish 5. The torsion spring 93 is twisted, and after the top plate 95 and the pendulum 92 are separated, the torsion spring 93 is reset to drive the pendulum 92 to reset, and the pendulum 92 hammers the outer wall of the grinding dish 5.

[0035] The rotation of the grinding dish 5 will drive the overrunning clutch 94 to rotate. When the overrunning clutch 94 rotates, the top plate 95 is restricted by the pendulum 92. Due to the unidirectional rotation of the overrunning clutch 94, the overrunning clutch 94 will idle. In the process of extracting magnetic powder, the output shaft of the motor 6 is reversed, and the reversal of the output shaft of the motor 6 drives the grinding dish 5 to reverse. The reversal of the grinding dish 5 drives the overrunning clutch 94 to reverse. The reversal of the overrunning clutch 94 drives the top plate 95 to rotate. The rotation of the top plate 95 will hit the pendulum 92. The pendulum 92 will swing away from the grinding dish 5 due to the impact. The torsion spring 93 is twisted. After the top plate 95 and the pendulum 92 are separated, the torsion spring 93 is reset to drive the pendulum 92 to reset. The pendulum 92 will hammer the outer wall of the grinding dish 5, so that the magnetic ore particles in the grinding dish 5 will vibrate. During the vibration of the magnetic ore particles, the finely ground magnetic powder will be better separated from the large-particle magnetic ore particles. In this way, the efficiency of extracting magnetic powder can be improved.

[0036] Embodiment 3: Based on embodiment 2, Figure 9-11As shown, a scraping component is provided in the grinding head 3, and the scraping component is used to scrape off the magnetic powder adsorbed on the inner wall of the cavity of the grinding head 3 to avoid the accumulation of magnetic powder in the cavity of the grinding head 3. The scraping component includes a scraping ring 101, and the scraping ring 101 is rotatably connected to the grinding head 3. The scraping ring 101 is located in the cavity of the grinding head 3, and a column gear 3 102 is fixedly connected to the scraping ring 101. A sliding gear rod 2 103 is slidably connected to the grinding head 3. The sliding gear rod 103 is slidably connected to the grinding head 3. A limiting groove is provided on the movable gear rod 103, a pressure spring 104 is connected between the sliding gear rod 103 and the grinding head 3, a limiting rod 105 is slidably connected inside the grinding head 3, the limiting rod 105 is located below the sliding gear rod 103, the limiting rod 105 is fixedly connected to one of the sliding gear rods 1 73, and the rotation of the scraper ring 101 will scrape the inner wall of the cavity of the grinding head 3, thereby scraping off the magnetic powder attached to the inner wall of the cavity of the grinding head 3.

[0037] A feed hopper 11 is also included, and the grinding dish 5 is fixedly connected to the feed hopper 11 .

[0038] When the sliding gear rod 1 73 extends out of the grinding head 3, the sliding gear rod 1 73 will drive the limiting rod 105 to move toward the sliding gear rod 2 103, and the limiting rod 105 will squeeze the sliding gear rod 2 103, so that the sliding gear rod 2 103 will move toward the direction close to the column gear 3 102, and the pressure spring 104 will be compressed, and the sliding gear rod 2 103 will mesh with the column gear 3 102, so that the column gear 3 102 rotates, and the rotation of the column gear 3 102 drives the scraper ring 101 The rotation of the scraper ring 101 will scrape the inner wall of the cavity of the grinding head 3, and then the magnetic powder attached to the inner wall of the cavity of the grinding head 3 will be scraped off, and the sliding gear rod 1 73 will be reset to drive the limit rod 105 to reset. After the limit rod 105 and the sliding gear rod 2 103 are separated, the pressure spring 104 will be reset to drive the sliding gear rod 2 103 to reset. In this way, the magnetic powder adsorbed on the inner wall of the cavity of the grinding head 3 can be scraped off, avoiding the accumulation of magnetic powder in the cavity of the grinding head 3, and further improving the efficiency of magnetic powder extraction.

[0039] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application.

Claims

1. A grinding device for fine screening of magnetic powder, characterized in that: The invention comprises a shell (1), wherein two electric hydraulic cylinders (2) are fixedly connected inside the shell (1), a grinding head (3) is fixedly connected between the telescopic rods of the two electric hydraulic cylinders (2), a cavity is opened inside the grinding head (3), a powder extraction pipe (4) is fixedly connected to the grinding head (3), the powder extraction pipe (4) is connected to the internal cavity of the grinding head (3), a grinding dish (5) is rotatably connected inside the shell (1), a motor (6) is fixedly connected inside the shell (1), the output shaft of the motor (6) is slidably connected to the grinding dish (5), a powder suction control component is provided on the grinding head (3), the powder suction control component is used to control the connection between the grinding dish (5) and the internal cavity of the grinding head (3), and a grinding auxiliary component is provided inside the shell (1), the grinding auxiliary component is used to strengthen the grinding pressure of the grinding head (3) on the magnetic powder, so as to improve the grinding efficiency.

2. A grinding device for fine screening of magnetic powder as claimed in claim 1, characterized in that: The powder suction control component comprises an adapter (71), the adapter (71) is rotatably connected to the grinding head (3), two column gears (72) are fixedly connected to the adapter (71), and the two column gears (72) are symmetrically arranged, two sliding gear rods (73) are slidably connected to the grinding head (3), the lower part of the sliding gear rod (73) is meshed with the column gear (72), and a return spring (74) is connected between the two sliding gear rods (73) and the grinding head (3), two column gears (75) are rotatably connected to the grinding head (3), the upper part of the sliding gear rod (73) is meshed with the column gear (75), and two fixed gear rods (76) are fixedly connected in the housing (1), and the fixed gear rods (76) are meshed with the column gear (75).

3. A grinding device for fine screening of magnetic powder as claimed in claim 2, characterized in that: The adapter (71) has a plurality of curved holes formed therein.

4. A grinding device for fine screening of magnetic powder as claimed in claim 3, characterized in that: The powder extraction tube (4) is retractable.

5. A grinding device for fine screening of magnetic powder as claimed in claim 4, characterized in that: The grinding auxiliary component comprises a push rod (81), two push rods (81) are fixedly connected to the grinding plate (5), and the two push rods (81) are symmetrically arranged. A push ring (82) is fixedly connected to the outer shell (1), and a tension spring (83) is connected between the grinding plate (5) and the outer shell (1).

6. A grinding device for fine screening of magnetic powder as claimed in claim 5, characterized in that: The shell (1) is provided with a hammering component, which is used to hammer the grinding dish (5) so as to separate small-particle magnetic powder from large-particle magnetic powder in the grinding dish (5), so that the small-particle magnetic powder can be better sucked away by the powder suction pipe (4), thereby improving the grinding efficiency. The hammering component includes a mounting plate (91), two mounting plates (91) are fixedly connected in the shell (1), each mounting plate (91) is rotatably connected to a pendulum (92), a torsion spring (93) is connected between the pendulum (92) and the mounting plate (91), an overrunning clutch (94) is fixedly connected to the grinding dish (5), and a top plate (95) is fixedly connected to the overrunning clutch (94).

7. A grinding device for fine screening of magnetic powder as claimed in claim 6, characterized in that: The grinding head (3) is provided with a scraping component, which is used to scrape off the magnetic powder adsorbed on the inner wall of the cavity of the grinding head (3) to avoid the accumulation of magnetic powder in the cavity of the grinding head (3). The scraping component includes a scraping ring (101), which is rotatably connected to the grinding head (3), and a column gear three (102) is fixedly connected to the scraping ring (101). A sliding gear rod two (103) is slidably connected to the grinding head (3), and a limiting groove is formed on the sliding gear rod two (103). A pressure spring (104) is connected between the sliding gear rod two (103) and the grinding head (3). A limiting rod (105) is slidably connected to the grinding head (3), and the limiting rod (105) is fixedly connected to one of the sliding gear rods one (73).

8. A grinding device for fine screening of magnetic powder as claimed in claim 7, characterized in that: It also comprises a feed hopper (11), and the feed hopper (11) is fixedly connected to the grinding dish (5).

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