A powder material grading circulation sand mill

Abstract

The invention discloses a powder material grading circulation type sand mill, which belongs to the technical field of powder material processing. The invention comprises a support seat, a grinding cylinder is arranged at one end of the support seat, a lifting mechanism is arranged at the top of the support seat, an aeration bevel is arranged on the inner wall of the bottom of the grinding cylinder, and an air pump is arranged at the bottom of the outer periphery of the grinding cylinder, and the lifting mechanism comprises a lifting cylinder column and a crossbeam; the invention can not only prompt the fine mixed material to form a graded circulation flow trajectory in the grinding cylinder, which is helpful for the uniform grinding treatment thereof, so as to improve the sand milling efficiency and particle size fineness of the overall powder material, but also form a reciprocating stirring and removing mechanism in the top area of ​​the grinding cylinder, which is helpful for the light particles at the top of the grinding cylinder and the fine mixed material retained in the flow to change the original position and flow trajectory, and effectively improve the sand milling uniformity of the powder material and the quality control pass rate of the powder material after processing.

Description

Technical Field

[0001] The invention relates to the technical field of powder material processing, in particular to a powder material grading circulation type sand mill. Background Art

[0002] The powder material sand mill is a device used to grind and disperse powder materials. The sand mill mainly uses the high-speed rotation of the agitator to drive the grinding media to produce strong shearing, impact and friction in the grinding cylinder to grind the powder materials to the required fineness. The materials enter the grinding cylinder under the action of the feed pump and fully contact with the grinding media. During the grinding process, the materials are continuously refined and a good dispersion effect is also achieved;

[0003] In combination with the above content, it should be explained that: during the sand milling process of traditional powder materials, due to the inconsistency of the particle size of the powder materials, the powder materials are stratified in the sand milling equipment, so that some powder materials in the stratified area are difficult to be sand milled, making it difficult to control the quality control pass rate of a single batch of powder materials. At the same time, the powder materials that are not fully sand milled need to increase the processing time, which seriously affects the sand milling efficiency and processing cost of the powder materials;

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] The object of the present invention is to provide a powder material grading circulation sand mill, which sucks the air trapped in the cavity at the top of the grinding cylinder, pressurizes it, and then aerates it progressively and obliquely outward from the drop groove as the starting point, so that the fine mixed materials in the grinding cylinder are mixed, and the fine mixed materials at the bottom of the grinding cylinder are pushed to flow upward along the inner wall of the grinding cylinder under the thrust of the bubbles.

[0006] The fixed grinding block cooperates with the driven grinding ring to actively suck the fine mixed material on the top of the grinding cylinder, and under the guidance of the active grinding ring, the processed fine mixed material is pushed to the drop port, so that the fine mixed material forms a graded circulating flow trajectory in the grinding cylinder, which helps to grind it evenly, thereby improving the overall sand grinding efficiency and particle size fineness of the powder material to solve the problem raised.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a powder material grading circulation sand mill, comprising a support seat, a grinding cylinder is arranged at one end of the support seat, and a lifting mechanism is arranged on the top of the support seat, an aeration bevel is arranged on the inner wall of the bottom of the grinding cylinder, and an air pump is arranged at the bottom of the outer periphery of the grinding cylinder, the lifting mechanism comprises a lifting cylinder column and a crossbeam, and a sealing cover located above the grinding cylinder is arranged below one end of the crossbeam;

[0008] A driving motor is arranged at the center of the top of the cover, and a fixed grinding block and an active grinding ring are arranged at the center of the bottom of the cover. A driven grinding ring located at the outer periphery of the fixed grinding block is arranged on the top of the active grinding ring. An external lifting cylinder and an internal lifting cylinder are arranged through the top of the cover.

[0009] Furthermore, a plurality of lifting frames are arranged on the side of one end of the support seat, and a lifting cylinder connected to the lifting frame is arranged inside one end of the support seat, and a counterweight base plate is arranged at the bottom of one end of the support seat.

[0010] Furthermore, an air suction port is provided on the inner wall at the top of the grinding cylinder, an air guide ring frame connected to an air pump is provided at the bottom of the outer periphery of the grinding cylinder, a drop groove is recessed on the inner wall at the bottom of the grinding cylinder, and an electric gate valve is provided at the bottom of the drop groove, and a discharge pipe is provided at the bottom of the electric gate valve.

[0011] Furthermore, the top of the lifting cylinder column is socketed with the cross beam, a hanging plate is arranged at the bottom of one end of the cross beam, and a plurality of connecting rods are arranged at the bottom of the hanging plate, and a counterweight block is arranged at the top of the other end of the cross beam.

[0012] Furthermore, a rod sleeve is provided at the bottom center of the cover, and a transmission rod inserted into the rod sleeve is provided at the bottom of the drive motor, the fixed grinding block is sleeved on the outer periphery of the bottom of the rod sleeve, a connecting sleeve connecting the transmission rod and the active grinding ring is provided below the fixed grinding block, a lower paddle is provided inside the active grinding ring, the driven grinding ring is clamped on the top of the active grinding ring, and an upper paddle is provided inside the driven grinding ring.

[0013] Furthermore, a servo motor is arranged at the bottom of the external lifting cylinder, and a collar is arranged below the servo motor, a rotating ring frame connected to the servo motor is arranged inside the collar, and a plurality of groups of inclined blades are arranged at the center of the rotating ring frame.

[0014] Furthermore, a connecting frame is provided at the bottom of the inner lifting cylinder, and a conical disk is provided between the connecting frames. A plurality of guide plates are arranged in a circular array on the top of the conical disk, and a drop opening is provided through the bottom of the conical disk.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention sucks the air trapped in the cavity at the top of the grinding cylinder, pressurizes it, and then aerates it progressively and obliquely outward from the drop groove as the starting point, so that the fine mixed materials in the grinding cylinder are mixed, and the fine mixed materials at the bottom of the grinding cylinder are pushed to flow upward along the inner wall of the grinding cylinder under the thrust of the bubbles floating up, and the fixed grinding block cooperates with the driven grinding ring to actively suck the fine mixed materials at the top of the grinding cylinder, and under the guidance of the active grinding ring, the processed fine mixed materials are concentratedly pushed to the drop port, so that the fine mixed materials form a graded circulation flow trajectory in the grinding cylinder, which is conducive to its uniform grinding treatment, so as to improve the sand milling efficiency and particle size fineness of the overall powder material;

[0017] 2. The present invention uses an external lifting cylinder to drive a sleeve ring in conjunction with an active grinding ring, forming an active speed-up mechanism at the bottom of the grinding cylinder, which helps to perform rotational impact crushing of the fine mixed material at the bottom of the grinding cylinder and the bubbles inside it, and can also use the rotation of inclined blades to push the fine mixed material at the bottom of the grinding cylinder to flow upward with increased pressure. The internal lifting cylinder is used in conjunction with a fixed grinding block and a driven grinding ring to form a reciprocating stirring and removing mechanism at the top area of ​​the grinding cylinder, which helps to change the original position and flow trajectory of the light particles at the top of the grinding cylinder and the fine mixed material retained in the flow, effectively improving the sand grinding uniformity of the powder material and the quality control pass rate of the powder material after processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings;

[0019] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the support base of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the lifting mechanism of the present invention;

[0022] Figure 4 It is a schematic structural diagram of the sealing cover of the present invention;

[0023] Figure 5 It is a schematic diagram of the connection structure between the servo motor and the fixed grinding block of the present invention;

[0024] Figure 6 It is a schematic diagram of the connection structure between the active grinding ring and the driven grinding ring of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the outer material lifting cylinder and the inner material lifting cylinder of the present invention;

[0026] Figure 8 It is a schematic diagram of the connection structure between the rotating ring frame and the servo motor of the present invention;

[0027] Fig. 9 It is a schematic diagram of the top view of the grinding cylinder of the present invention;

[0028] Fig.10 It is a schematic cross-sectional view of the grinding cylinder of the present invention.

[0029] Reference numerals: 1, support seat; 101, lifting cylinder; 102, lifting frame; 103, counterweight base plate; 2, lifting mechanism; 201, lifting cylinder column; 202, crossbeam; 203, counterweight block; 204, hanging plate; 205, connecting rod; 3, cover; 301, driving motor; 302, rod sleeve; 303, fixed grinding block; 304, transmission rod; 305, driven grinding ring; 306, upper blade; 307, connecting sleeve; 3 08, active grinding ring; 309, lower blade; 4, grinding cylinder; 401, drop trough; 402, aeration bevel; 403, discharge pipe; 404, vacuum pump; 405, electric gate valve; 406, air guide ring frame; 407, air intake; 5, external lifting cylinder; 501, servo motor; 502, sleeve ring; 503, rotating ring frame; 6, internal lifting cylinder; 601, connecting frame; 602, cone disk; 603, guide vane; 604, drop. DETAILED DESCRIPTION

[0030] 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.

[0031] Embodiment 1: This embodiment is used to solve the problem that during the sand grinding process of traditional powder materials, the powder materials are stratified in the sand grinding equipment due to the inconsistent particle size of the powder materials, so that some powder materials in the stratified area are difficult to be sand ground, resulting in the difficulty in controlling the quality control pass rate of a single batch of powder materials. At the same time, the powder materials that are not fully sand ground require increased processing time, which seriously affects the sand grinding efficiency of the powder materials and the processing cost.

[0032] See also Figure 1 - Fig.10 As shown, this embodiment is a powder material classification circulation sand mill, comprising a support base 1, a grinding cylinder 4 is arranged at one end of the support base 1, and a lifting mechanism 2 is arranged on the top of the support base 1, an aeration bevel 402 is arranged on the inner wall of the bottom of the grinding cylinder 4, and an air pump 404 is arranged at the bottom of the outer periphery of the grinding cylinder 4;

[0033] The lifting mechanism 2 includes a lifting cylinder column 201 and a crossbeam 202, and a cover 3 located above the grinding cylinder 4 is provided below one end of the crossbeam 202. The grinding cylinder 4 and the lifting frame 102 fixing fasteners are replaced according to the processing needs of the powder material, and the grinding cylinder 4 is pushed to move close to one end of the support seat 1 until the grinding cylinder 4 is located above the lifting cylinder 101 and the counterweight bottom plate 103, and the top of the grinding cylinder 4 is aligned with the cover 3 up and down. The lifting cylinder 101 drives the lifting frame 102 to slide up until the lifting frame 102 is in contact with the bottom of the grinding cylinder 4, and the top fastener of the lifting frame 102 is used to limit the bottom of the grinding cylinder 4, and the brake of the universal wheel at the bottom of the grinding cylinder 4 is opened at the same time;

[0034] The top of the lifting cylinder column 201 is sleeved with the cross beam 202, a hanging plate 204 is arranged at the bottom of one end of the cross beam 202, and a plurality of connecting rods 205 are arranged at the bottom of the hanging plate 204, and a counterweight block 203 is arranged at the top of the other end of the cross beam 202;

[0035] A plurality of lifting frames 102 are arranged on the side of one end of the support seat 1, and a lifting cylinder 101 connected to the lifting frame 102 is arranged inside one end of the support seat 1, and a counterweight bottom plate 103 is arranged at the bottom of one end of the support seat 1. The lifting cylinder column 201 drives the crossbeam 202 to slide down, and the crossbeam 202 drives the cover 3 to slide down through the hanging plate 204 and the connecting rod 205 until the cover 3 is sealed and connected with the top of the grinding cylinder 4. At the same time, during the sliding of the cover 3, the fixed grinding block 303, the collar 502 and the cone disk 602 are all moved into the grinding cylinder 4, and the upper feed port of the cover 3 is opened, and the external equipment pours the powder material and the grinding medium into the grinding cylinder 4 together;

[0036] An air inlet 407 is provided on the inner wall of the top of the grinding cylinder 4, an air guide ring frame 406 connected to the air pump 404 is provided at the bottom of the outer periphery of the grinding cylinder 4, a drop groove 401 is provided on the inner wall of the bottom of the grinding cylinder 4, and an electric gate valve 405 is provided at the bottom of the drop groove 401, and a discharge pipe 403 is provided at the bottom of the electric gate valve 405;

[0037] When the finely mixed material is pushed into the trough 401, the air pump 404 is connected to the air guide ring frame 406 and the air inlet 407 through a pipeline. The air inlet 407 continuously extracts excess air from the top of the grinding cylinder 4, causing the air pressure between the top of the grinding cylinder 4 and the cover 3 to decrease, and the extracted air is pressurized and filled in the air guide ring frame 406. A pipe connected to the air guide ring frame 406 is provided at the bottom of the aeration oblique port 402, and the pressurized gas is dispersed inside each aeration oblique port 402. The aeration oblique port 402 extends from the inner wall of the trough 401 to the arc-shaped surface at the bottom of the grinding cylinder 4, and each group is arranged in a ring array to form an aeration ring;

[0038] The aeration bevel 402 located in the drop 401 first guides the gas to be injected into the finely mixed material. According to the processing requirements of the finely mixed material, the aeration ring inside the drop 604 is opened progressively outward. Under the pressure of the gas, the finely mixed material is pushed outward from the center to the outside in a trumpet shape. Accompanied by the upward thrust of the bubbles and the suction generated by the continuous rotation of the driven grinding ring 305, the finely mixed material is prompted to form a circulating flow structure inside the grinding cylinder 4.

[0039] Embodiment 2: This embodiment is a powder material classification circulation sand mill, including a driving motor 301 arranged at the center of the top of the cover 3, and a fixed grinding block 303 and an active grinding ring 308 arranged at the center of the bottom of the cover 3, a driven grinding ring 305 located at the outer periphery of the fixed grinding block 303 is arranged on the top of the active grinding ring 308, and an external lifting cylinder 5 and an internal lifting cylinder 6 are arranged through the top of the cover 3;

[0040] The driving motor 301 drives the active grinding ring 308 to rotate through the transmission rod 304, and the active grinding ring 308 drives the driven grinding ring 305 to rotate synchronously. The driven grinding ring 305 rotates at a uniform speed along the outer periphery of the fixed grinding block 303, and the upper blade 306 guides the powder material and the grinding medium on the top of the grinding cylinder 4 to flow into the gap between the fixed grinding block 303 and the driven grinding ring 305. The driven grinding ring 305 rotates along the outer periphery of the fixed grinding block 303 and the size of the gap between the two promotes the mutual extrusion and friction between the powder material and the grinding medium passing together, so that the powder material is further ground and crushed. The finely mixed material is pushed into the active grinding ring 308 by the powder material and grinding medium that are continuously guided to be injected later;

[0041] A rod sleeve 302 is provided at the bottom center of the cover 3, and a transmission rod 304 inserted into the rod sleeve 302 is provided at the bottom of the driving motor 301, a fixed grinding block 303 is sleeved on the outer periphery of the bottom of the rod sleeve 302, a connecting sleeve 307 connecting the transmission rod 304 and the active grinding ring 308 is provided below the fixed grinding block 303, a lower blade 309 is provided inside the active grinding ring 308, a driven grinding ring 305 is clamped on the top of the active grinding ring 308, and an upper blade 306 is provided inside the driven grinding ring 305;

[0042] After the finely mixed material enters the active grinding ring 308, it is guided by the lower blade 309 inside the active grinding ring 308, so that the finely mixed material is pressed toward the trough 401 and its surroundings under the rotation inertia of the active grinding ring 308 and the pushing pressure of the subsequent materials. Part of the finely mixed material that enters the trough 401 is pushed to diffuse to the surroundings, and pushes the finely mixed material accumulated around to flow along the bottom of the grinding cylinder 4. The powder material and grinding media inside the grinding cylinder 4 are continuously processed by the fixed grinding block 303 and the driven grinding ring 305, and under the push of the active grinding ring 308, the powder material and grinding media inside the grinding cylinder 4 are gradually replaced by the finely mixed material.

[0043] A servo motor 501 is provided at the bottom of the external lifting cylinder 5, and a collar 502 is provided below the servo motor 501. A rotating ring frame 503 connected to the servo motor 501 is provided inside the collar 502, and a plurality of inclined blades are provided in the center of the rotating ring frame 503. The external lifting cylinder 5 drives the collar 502 to slide down until the collar 502 slides down along the inside of the grinding cylinder 4 to below the active grinding ring 308.

[0044] The servo motor 501 is started, and the servo motor 501 drives the rotating ring frame 503 to rotate along the inside of the sleeve ring 502 through the transmission member. When the rotating ring frame 503 rotates along the inside of the sleeve ring 502, the inclined blades push the fine mixed material at the bottom of the grinding cylinder 4 to flow further upward, and accelerate the upward flow. At the same time, the inclined blades are used to break the bubbles in the fine mixed material, so that the fine mixed materials are fully mixed, and the fine mixed materials contact the inclined blades to impact and break some broken particles.

[0045] A connecting frame 601 is provided at the bottom of the inner lifting cylinder 6, and a cone disk 602 is provided between the connecting frames 601. A plurality of guide plates 603 are arranged in a circular array on the top of the cone disk 602. A dropper 604 is provided through the bottom of the cone disk 602. The inner lifting cylinder 6 drives the cone disk 602 to slide up and down along the axial direction of the outer periphery of the rod sleeve 302, which helps to change the flow trajectory of the finely mixed material at the top of the grinding cylinder 4 and prevent some light finely mixed materials from being continuously retained at the top of the grinding cylinder 4.

[0046] When the conical disk 602 slides down and sinks into the finely mixed material, the gap between the drop opening 604 and the rod sleeve 302 is used to cause the particles located above the fixed grinding block 303 and adhered to the surface of the rod sleeve 302 to be washed away by the finely mixed material flowing into the conical disk 602 along the drop opening 604; when the conical disk 602 slides up, the finely mixed material located at the top of the conical disk 602 falls along the drop opening 604 under the action of its own weight and the pushing and squeezing pressure of the conical disk 602, and the finely mixed material located at the edge of the conical disk 602 is affected by the thrust, part of which overflows along the edge of the conical disk 602, and part of which is blocked along the guide vanes 603, and flows along the gaps between the guide vanes 603 along a fixed trajectory until it gathers along the drop opening 604 and rushes toward the fixed grinding block 303.

[0047] Combining the first and second embodiments, it can be known that the finely mixed materials at the bottom of the grinding cylinder 4 can be pushed to flow upward along the inner wall of the grinding cylinder 4, and the fixed grinding block 303 cooperates with the driven grinding ring 305 to actively suck the finely mixed materials at the top of the grinding cylinder 4, and under the guidance of the active grinding ring 308, the processed finely mixed materials are concentratedly pushed to the drop port 604, so that the finely mixed materials form a graded circulation flow trajectory in the grinding cylinder 4, which is conducive to its uniform grinding process, so as to improve the sand grinding efficiency and particle size fineness of the overall powder material;

[0048] An active speed-up mechanism is formed at the bottom of the grinding cylinder 4, which helps to perform rotational impact crushing of the fine mixed materials at the bottom of the grinding cylinder 4 and the bubbles inside it. The inclined blades are used to rotate and push the fine mixed materials at the bottom of the grinding cylinder 4 to flow upward with increased pressure. The internal lifting cylinder 6 is used in conjunction with the fixed grinding block 303 and the driven grinding ring 305. A reciprocating stirring and removing mechanism is formed in the top area of ​​the grinding cylinder 4, which helps to change the original position and flow trajectory of the light particles at the top of the grinding cylinder 4 and the fine mixed materials retained in the flow, thereby effectively improving the sand grinding uniformity of the powder materials and the quality control pass rate of the powder materials after processing.

[0049] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A powder material classification circulation sand mill, comprising a support base (1), characterized in that: A grinding cylinder (4) is arranged at one end of the support seat (1), and a lifting mechanism (2) is arranged at the top of the support seat (1); an aeration bevel (402) is arranged on the inner wall of the bottom of the grinding cylinder (4), and an air pump (404) is arranged at the bottom of the outer periphery of the grinding cylinder (4); the lifting mechanism (2) comprises a lifting cylinder column (201) and a crossbeam (202), and a sealing cover (3) located above the grinding cylinder (4) is arranged below one end of the crossbeam (202); A driving motor (301) is arranged at the center of the top of the cover (3), and a fixed grinding block (303) and an active grinding ring (308) are arranged at the center of the bottom of the cover (3); a driven grinding ring (305) located on the outer periphery of the fixed grinding block (303) is arranged at the top of the active grinding ring (308), and an external material lifting cylinder (5) and an internal material lifting cylinder (6) are arranged through the top of the cover (3); A plurality of lifting frames (102) are arranged on the side of one end of the support seat (1), and a lifting cylinder (101) connected to the lifting frame (102) is arranged inside one end of the support seat (1), and a counterweight base plate (103) is arranged at the bottom of one end of the support seat (1); The inner wall at the top of the grinding cylinder (4) is provided with an air inlet (407); the outer bottom of the grinding cylinder (4) is provided with an air guide ring frame (406) connected to the air pump (404); a drop groove (401) is provided in a depression on the inner wall at the bottom of the grinding cylinder (4); an electric gate valve (405) is provided at the bottom of the drop groove (401); a discharge pipe (403) is provided at the bottom of the electric gate valve (405); the air pump (404) is connected to the air guide ring frame (406) and the air inlet (407) via a pipeline; when the finely mixed material is pushed into the drop groove (401), a discharge pipe (403) is provided at the bottom of the electric gate valve (405); 1), the air inlet (407) continuously extracts excess air from the top of the grinding cylinder (4), causing the air pressure between the top of the grinding cylinder (4) and the cover (3) to decrease, and the extracted air is pressurized and filled in the air guide ring frame (406). A pipe connected to the air guide ring frame (406) is provided at the bottom of the aeration oblique opening (402), and the pressurized gas is dispersed inside each aeration oblique opening (402). The aeration oblique opening (402) extends from the inner wall of the drop groove (401) to the arc-shaped surface at the bottom of the grinding cylinder (4), and each group is arranged in a ring array to form an aeration ring; A rod sleeve (302) is provided at the center of the bottom of the cover (3), and a transmission rod (304) inserted into the rod sleeve (302) is provided at the bottom of the drive motor (301); the fixed grinding block (303) is sleeved on the outer periphery of the bottom of the rod sleeve (302); a connecting sleeve (307) of the transmission rod (304) and the active grinding ring (308) is provided below the fixed grinding block (303); a lower blade (309) is provided inside the active grinding ring (308); the driven grinding ring (305) is clamped on the top of the active grinding ring (308), and an upper blade (306) is provided inside the driven grinding ring (305); A servo motor (501) is arranged at the bottom of the external material lifting cylinder (5), and a collar (502) is arranged below the servo motor (501); a rotating ring frame (503) drivingly connected to the servo motor (501) is arranged inside the collar (502), and a plurality of groups of inclined blades are arranged at the center of the rotating ring frame (503); the external material lifting cylinder (5) can drive the collar (502) to slide down until the collar (502) slides down along the inside of the grinding cylinder (4) to below the active grinding ring (308); A connecting frame (601) is provided at the bottom of the inner material lifting cylinder (6), and a conical disk (602) is provided between the connecting frames (601). A plurality of guide plates (603) are arranged in a circular array on the top of the conical disk (602). A dropper (604) is provided through the bottom of the conical disk (602). Two inner material lifting cylinders (6) are provided. The two inner material lifting cylinders (6) can drive the conical disk (602) to slide up and down along the outer circumference of the rod sleeve (302), thereby helping to change the flow trajectory of the finely mixed material at the top of the grinding cylinder (4).

2. A powder material classification circulation sand mill according to claim 1, characterized in that: The top of the lifting cylinder column (201) is sleeved with the crossbeam (202), a hanging plate (204) is arranged at the bottom of one end of the crossbeam (202), and a plurality of connecting rods (205) are arranged at the bottom of the hanging plate (204), and a counterweight block (203) is arranged at the top of the other end of the crossbeam (202).

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