Vertical sand mill

Abstract

The present invention discloses a vertical sand mill, wherein the vertical sand mill includes a cylinder, a driving mechanism and a screening mechanism, the cylinder has an inner cavity; one end of the driving mechanism is rotatably arranged in the cylinder and extends into the inner cavity; the screening mechanism is sleeved on the outer wall of the driving mechanism and is spaced from the inner wall of the cylinder; the screening mechanism and the driving mechanism are combined to form a first flow channel, the screening mechanism and the cylinder are combined to form a second flow channel, the screening mechanism is provided with a first through hole and a second through hole, the first through hole and the second through hole connect the first flow channel and the second flow channel, and the diameter of the first through hole is different from the diameter of the second through hole. The technical solution of the present invention allows the grinding medium and grinding particles of different diameters in the grinding process to flow in an orderly manner in the flow field, and realizes the separation of the grinding medium and the material and the classification of particles of different sizes, thereby making the size of the discharged grinding particles uniform and improving the grinding effect.

Description

Technical Field

[0001] The invention relates to the technical field of sand mills, in particular to a vertical sand mill. Background Art

[0002] Sand mill is the most effective equipment for preparing ultrafine particles, which is mainly divided into two types: horizontal and vertical. However, the grinding flow field of the existing vertical sand mill is disordered, and the classification effect is not obvious, resulting in a wide distribution of particle size of the output product, and poor grinding effect and efficiency. Summary of the invention

[0003] The main purpose of the present invention is to provide a vertical sand mill, which aims to allow the grinding medium and grinding particles of different diameters in the grinding process to flow orderly in the sand mill flow field, realize the separation of the grinding medium and the material and the graded grinding of particles of different diameters, so as to make the size of the discharged grinding particles uniform and improve the grinding effect.

[0004] To achieve the above object, the present invention provides a vertical sand mill, which comprises:

[0005] A cylinder having an inner cavity;

[0006] A driving mechanism, one end of which is rotatably disposed in the cylinder and extends into the inner cavity; and

[0007] A screening mechanism is sleeved on the outer wall of the driving mechanism and spaced from the inner wall of the cylinder; the screening mechanism and the driving mechanism are enclosed to form a first flow channel, the screening mechanism and the cylinder are enclosed to form a second flow channel, the screening mechanism is provided with a first through hole and a second through hole, the first through hole and the second through hole are connected to the first flow channel and the second flow channel, and the diameter of the first through hole is different from the diameter of the second through hole;

[0008] The driving mechanism drives the screening mechanism to rotate, so that abrasive particles with different diameters enter the second flow channel from the first flow channel through the first through hole and the second through hole.

[0009] In one embodiment, the screening mechanism comprises:

[0010] A first rotating drum is sleeved on the outer wall of the driving mechanism and spaced apart from the inner wall of the cylinder; the first rotating drum is spaced apart and provided with a plurality of the first through holes, and the plurality of the first through holes are arranged around the periphery of the first rotating drum; and

[0011] The second rotating drum is sleeved on the outer wall of the driving mechanism and is spaced apart from the inner wall of the cylinder; the second rotating drum and the first rotating drum are arranged in sequence along the extension direction of the driving mechanism; the inner wall of the first rotating drum, the inner wall of the second rotating drum and the driving mechanism form the first flow channel, and the outer wall of the first rotating drum, the outer wall of the second rotating drum and the inner wall of the cylinder form the second flow channel; the second rotating drum is provided with a plurality of the second through holes at intervals, and the plurality of the second through holes are arranged around the periphery of the second rotating drum; the diameter of the second through hole is smaller than the diameter of the first through hole.

[0012] In one embodiment, the screening mechanism further comprises a sleeve disposed between the cylinder body and the second rotating cylinder, the inner wall of the sleeve is provided with an internal thread, the outer wall of the second rotating cylinder is provided with an external thread, and the internal thread and the external thread are spaced apart to form a spiral channel;

[0013] The outer wall of the first rotating drum and the inner wall of the cylinder body form a straight channel, and the spiral channel is connected to the straight channel to form the second flow channel.

[0014] In one embodiment, a direction perpendicular to the extension direction of the driving mechanism is defined as a first direction, an inner wall of the first rotating drum and the driving mechanism are enclosed to form a first section, an inner wall of the second rotating drum and the driving mechanism are enclosed to form a second section, the second section is connected to the first section, and forms the first flow channel; a width of the first section along the first direction is smaller than a width of the second section along the first direction.

[0015] In one embodiment, a plurality of third via holes are provided at intervals at one end of the second rotating drum adjacent to the first rotating drum, the plurality of third via holes connect the first flow channel and the second flow channel, and the plurality of third via holes are arranged around the circumference of the second rotating drum and are spaced apart from the plurality of second via holes; a diameter of the third via hole is smaller than a diameter of the first via hole and larger than a diameter of the second via hole.

[0016] In one embodiment, a plurality of fourth via holes are provided at an end of the second rotating drum away from the first rotating drum, the plurality of fourth via holes connect the first flow channel and the second flow channel, the plurality of fourth via holes are arranged around the periphery of the second rotating drum, and are spaced apart from the plurality of second via holes and the plurality of third via holes; and the diameter of the fourth via hole is smaller than the diameter of the second via hole.

[0017] In one embodiment, a plurality of first protrusions are provided at intervals on the outer wall of the first rotating drum, and the plurality of first protrusions are arranged around the circumference of the first rotating drum.

[0018] In one embodiment, a groove is provided at one end of the driving mechanism extending into the inner cavity;

[0019] The vertical sand mill also includes:

[0020] a fixed column, disposed in the inner cavity and connected to the bottom wall of the inner cavity, the fixed column being opposite to and spaced from one end of the driving mechanism adjacent to the feed port; and

[0021] A central tube is arranged in the inner cavity, passes through the fixing column and extends into the groove, and one end of the central tube extending into the groove is spaced from the groove wall of the groove.

[0022] In one embodiment, a plurality of third protrusions are provided at intervals on the outer wall of the fixing column, and the plurality of third protrusions are arranged around the periphery of the fixing column.

[0023] In one embodiment, the driving mechanism includes a motor, a main shaft and a supporting shaft head, the motor is drivingly connected to the main shaft, the end of the main shaft facing away from the motor is drivingly connected to the supporting shaft head, one end of the main shaft and the supporting shaft head extend into the inner cavity and are rotatably arranged at the opening; the screening mechanism is sleeved on the side wall of one end of the main shaft extending into the inner cavity.

[0024] The vertical sand mill of the technical solution of the present invention comprises a cylinder, a driving mechanism and a screening mechanism; the cylinder has an inner cavity; one end of the driving mechanism is rotatably arranged in the cylinder and extends into the inner cavity; the screening mechanism is sleeved on the outer wall of the driving mechanism and is spaced from the inner wall of the cylinder; the screening mechanism and the driving mechanism are combined to form a first flow channel, and the screening mechanism and the cylinder are combined to form a second flow channel, and the screening mechanism is provided with a first through hole and a second through hole, the first through hole and the second through hole are connected to the first flow channel and the second flow channel, and the diameter of the first through hole is different from the diameter of the second through hole; in this way, during the grinding process, the driving mechanism drives the screening mechanism to rotate at a high speed, and a stable and orderly flow field is formed between the driving mechanism and the screening mechanism, and the first through hole and the second through hole with different diameters allow coarse particles to pass through and enter the second flow channel for the next round of grinding, and the coarse particles are ground more times, so that the coarse particles are quickly ground, and the fine particles enter the discharge port along the first flow channel, and the number of grinding times is relatively small, so that the fine particles will not be over-ground, thereby making the size of the discharged grinding particles uniform, thereby improving the grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a cross-sectional schematic diagram of an embodiment of a vertical sand mill of the present invention;

[0027] Figure 2 It is a schematic structural diagram of the first rotating drum of the vertical sand mill of the present invention.

[0028] Description of Figure Numbers:

[0029] Label name Label name 10 Cylinder 302b Straight channel 10a Inner cavity 30c First via 10b Opening 30d Second via 10c Feed port 31 First drum 10d Discharge port 311 First bump 20 Driving mechanism 32 Second drum 21 Spindle 321 External thread 22 Support shaft head 32a The third via 20a Grooves 32b Fourth via 30 Screening mechanism 33 Sleeve 30a First runner 331 Internal thread 301a First section 40 Fixed column 302a Second section 41 The third bump 30b Second flow channel 50 Center tube 301b Spiral channel

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] 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.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The invention provides a vertical sand mill.

[0035] In the embodiment of the present invention, refer to Figure 1 and Figure 2The vertical sand mill comprises a barrel 10, a driving mechanism 20 and a screening mechanism 30; the barrel 10 has an inner cavity 10a; one end of the driving mechanism 20 is rotatably arranged in the barrel 10 and extends into the inner cavity 10a; the screening mechanism 30 is sleeved on the outer wall of the driving mechanism 20 and is spaced from the inner wall of the barrel 10; the screening mechanism 30 and the driving mechanism 20 enclose a first flow channel 30a, and the screening mechanism 30 and the barrel 10 enclose a second flow channel 30b The sieving mechanism 30 is provided with a first through hole 30c and a second through hole 30d, the first through hole 30c and the second through hole 30d are connected to the first flow channel 30a and the second flow channel 30b, and the diameter of the first through hole 30c is different from the diameter of the second through hole 30d; the driving mechanism 20 drives the sieving mechanism 30 to rotate, so that the abrasive particles of different diameters enter the second flow channel 30b from the first flow channel 30a through the first through hole 30c and the second through hole 30d.

[0036] In the present embodiment, the cylinder 10 is further provided with an opening 10b connected to the inner cavity 10a, a feed port 10c and a discharge port 10d, wherein the opening 10b and the feed port 10c are respectively located at the end faces of the two ends of the cylinder 10, and the discharge port 10d is located on the side wall of the cylinder 10; the first through hole 30c or the second through hole 30d is arranged along the axial direction of the driving mechanism 20; wherein the feed port and the discharge port are both connected to the first flow channel 30a; when the slurry enters the first flow channel 30a from the feed port 10c through the material pump, and the driving mechanism 20 drives the screening mechanism 30 to rotate at a high speed, a strong centrifugal force is generated, and the coarse particles with larger diameters in the slurry are subjected to a larger centrifugal force, and then move to an area farther away from the rotation center of the driving mechanism 20, that is, a position close to the inner wall of the cylinder 10, so that the particles with larger diameters can be easily passed through the first through hole 3 0c or the second through hole 30d enters the second flow channel 30b and enters the next grinding cycle, while the fine particles with smaller diameters in the slurry are subject to less centrifugal force and are distributed in an area closer to the rotation center of the driving mechanism 20, that is, the fine particles with smaller diameters move along the first flow channel 30a in the direction close to the discharge port 10d, thereby realizing a first-level graded separation between coarse and fine particles, separating the grinding medium from the particles in the slurry, and ensuring that the grinding medium is always circulated and ground between the first flow channel 30a and the second flow channel 30b; in this way, during the grinding process, the first through holes 30c and the second through holes 30d with different diameters can allow particles of different diameters to pass through and enter the second flow channel 30b for the next round of grinding, forming an orderly flow field, screening out the particles with the smallest diameter for discharge, and thereby making the size of the discharged grinding particles uniform, thereby improving the grinding effect. The cylinder 10 includes a body and an upper cover, and the upper cover is detachably connected to the body, so that the cylinder 10 can be disassembled and the components in the cylinder 10 can be replaced; and the upper cover has an installation cavity, and a seal is installed in the installation cavity to seal the gap between the upper cover and the body, so that the slurry is not easy to leak. The upper cover is also provided with a discharge port 10d and a discharge chamber connected to the discharge port 10d, the discharge chamber is connected to the first flow channel 30a, and the first flow channel 30a is connected to the second flow channel 30b, so that the discharge speed of the vertical sand mill can be accelerated by increasing the storage space for the slurry after accumulation and screening.

[0037] The vertical sand mill of the technical solution of the present invention comprises a barrel 10, a driving mechanism 20 and a screening mechanism 30; the barrel 10 has an inner cavity 10a; one end of the driving mechanism 20 is rotatably arranged in the barrel 10 and extends into the inner cavity 10a; the screening mechanism 30 is sleeved on the outer wall of the driving mechanism 20 and is spaced from the inner wall of the barrel 10; the screening mechanism 30 and the driving mechanism 20 are enclosed to form a first flow channel 30a, the screening mechanism 30 and the barrel 10 are enclosed to form a second flow channel 30b, and the screening mechanism 30 is provided with a first through hole 30c and a second through hole 30d, and the first through hole 30c and the second through hole 30d are connected to the The first flow channel 30a and the second flow channel 30b are respectively provided, and the diameter of the first through hole 30c is different from the diameter of the second through hole 30d; in this way, during the grinding process, the driving mechanism 20 drives the screening mechanism 30 to rotate at a high speed, and a stable and orderly flow field is formed between the driving mechanism 20 and the screening mechanism 30. The first through hole 30c and the second through hole 30d with different diameters allow the coarse particles to pass through and enter the second flow channel 30b for the next round of grinding. The more times of grinding, the faster the coarse particles are ground, and the fine particles enter the discharge port along the first flow channel 30a. The fewer times of grinding, the less fine particles are over-ground, thereby making the size of the discharged ground particles uniform and improving the grinding effect.

[0038] In one embodiment, referring to Figure 1 and Figure 2 The screening mechanism 30 includes a first rotating drum 31 and a second rotating drum 32. The first rotating drum 31 is sleeved on the outer wall of the driving mechanism 20 and is spaced apart from the inner wall of the cylinder body 10. The second rotating drum 32 and the first rotating drum 31 are sequentially arranged along the extension direction of the driving mechanism 20. The inner wall of the first rotating drum 31, the inner wall of the second rotating drum 32 and the driving mechanism 20 are combined to form the first flow channel 30a. The outer wall of the first rotating drum 31, the outer wall of the second rotating drum 32 and the inner wall of the cylinder body 10 are combined to form the second flow channel 30b. The first rotating drum 31 is provided with a plurality of the first through holes 30c at intervals, and the plurality of the first through holes 30c are arranged around the circumference of the first rotating drum 31; the second rotating drum 32 is sleeved on the outer wall of the driving mechanism 20 and is spaced apart from the inner wall of the cylinder body 10; the second rotating drum 32 is connected to the side of the first rotating drum 31 sleeved on the driving mechanism 20; the second rotating drum 32 is provided with a plurality of the second through holes 30d at intervals, and the plurality of the second through holes 30d are arranged around the circumference of the second rotating drum 32; the diameter of the second through hole 30d is smaller than the diameter of the first through hole 30c.

[0039] In this embodiment, the first drum 31 has a first through groove, the second drum 32 has a second through groove, and the volume of the first through groove is greater than that of the second through groove, and the first drum 31 and the second drum 32 are both sleeved on the outer wall of the driving mechanism 20; one end of the first drum 31 is connected to the driving mechanism 20, and the other end is not connected, and the second drum 32 and the first drum 31 are both sleeved on the outer wall of the driving mechanism 20, and are arranged along the extension direction of the driving mechanism 20; the first drum 31 is provided with a first through hole 30c with a larger diameter, and the second drum 32 is provided with a second through hole 30d with a smaller diameter, so that the first through hole 30c is closer to the feed port 10c, and the second through hole 30d is farther from the feed port; when the particles with larger diameter in the slurry can first enter the second flow channel 30b from the first through hole 30c to enter the next round of grinding, the particles with smaller diameter can enter the second flow channel 30b from the second through hole 30d, thereby realizing secondary separation of the particles.

[0040] In one embodiment, referring to Figure 1 and Figure 2 The screening mechanism 30 also includes a sleeve 33 arranged between the cylinder 10 and the second rotating cylinder 32, the inner wall of the sleeve 33 is provided with an internal thread 331, the outer wall of the second rotating cylinder 32 is provided with an external thread 321, and the internal thread 331 and the external thread 321 are spaced apart to form a spiral channel 301b; the outer wall of the first rotating cylinder 31 and the inner wall of the cylinder 10 form a straight channel 302b, the spiral channel 301b and the straight channel 302b are connected to form the second flow channel 30b.

[0041] In this embodiment, a spiral channel 301b is formed by enclosing the internal thread 331 of the sleeve 33 and the external thread 321 of the second rotating drum 32. When the slurry flows through the spiral channel 301b, the spiral channel 301b has a certain guiding property, so that the slurry is not easy to flow back to the second through hole 30d during the flow process, and flows directly to the discharge port 10d, thereby ensuring that the diameter of the grinding particles discharged from the discharge port 10d is consistent, thereby improving the grinding effect of the vertical sand mill; and the first rotating drum 31 and the cylinder body 10 form a straight channel 302b, and the slurry flowing back from the spiral channel 301b can quickly enter the first flow channel 30a through the straight channel 302b to carry out the next round of grinding cycle.

[0042] In one embodiment, referring to Figure 1 and Figure 2, a direction perpendicular to the extension direction of the driving mechanism 20 is defined as a first direction, the inner wall of the first rotating drum 31 and the driving mechanism 20 are enclosed to form a first section 301a, the inner wall of the second rotating drum 32 and the driving mechanism 20 are enclosed to form a second section 302a, the second section 302a is connected to the first section 301a, and forms the first flow channel 30a; the width of the first section 301a along the first direction is smaller than the width of the second section 302a along the first direction.

[0043] Through the above arrangement, when the slurry enters the first segment 301a and the second segment 302a in sequence, since the width of the second segment 302a in the first direction is smaller than the width of the first segment 301a in the first direction, the abrasive particles with larger diameters in the slurry will be subjected to a larger centrifugal force and will move toward the first segment 301a farther from the rotation center of the driving mechanism 20, and cannot move toward the second segment 302a along the axial direction of the driving mechanism 20, thereby improving the grading effect of the separation of the abrasive particles, so that the abrasive particles of different diameters cannot move around at will.

[0044] In one embodiment, referring to Figure 1 and Figure 2 A plurality of third via holes 32a are provided at one end of the second rotating drum 32 adjacent to the first rotating drum 31, and the plurality of third via holes 32a connect the first flow channel 30a and the second flow channel 30b, and the plurality of third via holes 32a are arranged around the periphery of the second rotating drum 32 and are spaced apart from the plurality of second via holes 30d; the diameter of the third via hole 32a is smaller than the diameter of the first via hole 30c and larger than the diameter of the second via hole 30d.

[0045] In this embodiment, a plurality of third through holes 32a are provided at one end of the second rotating drum 32 adjacent to the first rotating drum 31, and the diameter of the third through hole 32a is between the first through hole 30c and the second through hole 30d. In this way, the range of graded separation of the grinding particles of the slurry is further increased, thereby improving the grinding effect of the vertical sand mill and meeting the customer's requirements for the grinding width of the grinding particles.

[0046] In one embodiment, referring to Figure 1 and Figure 2 A plurality of fourth via holes 32b are provided at one end of the second rotating drum 32 away from the first rotating drum 31, and the plurality of fourth via holes 32b are connected to the first flow channel 30a and the second flow channel 30b. The plurality of fourth via holes 32b are arranged around the periphery of the second rotating drum 32, and are spaced apart from the plurality of second via holes 30d and the plurality of third via holes 32a; and the diameter of the fourth via holes 32b is smaller than the diameter of the second via holes 30d.

[0047] In this embodiment, a plurality of fourth through holes 32b are provided at one end of the second rotating drum 32 away from the first rotating drum 31, and the diameters of the fourth through holes 32b are all smaller than the first through holes 30c, the second through holes 30d and the third through holes 32a. In this way, the range of graded separation of the grinding particles of the slurry is further increased, thereby improving the grinding effect of the vertical sand mill and meeting the customer's requirements for the grinding width of the grinding particles.

[0048] In one embodiment, referring to Figure 1 and Figure 2 , the outer wall of the first rotating drum 31 is provided with a plurality of first protrusions 311 at intervals, and the plurality of first protrusions 311 are arranged around the periphery of the first rotating drum 31. In this embodiment, the plurality of first protrusions 311 are arranged at intervals on the outer wall of the first rotating drum 31, and the plurality of first protrusions 311 are arranged in a rectangular array; when the slurry enters the second flow channel 30b between the first rotating drum 31 and the cylinder body 10, the plurality of first protrusions 311 can act as grinding media, collide with the grinding particles in the slurry to form grinding particles with a smaller diameter, thereby improving the grinding effect of the vertical sand mill. It is worth noting that the first rotating drum 31 includes a sub-screening drum provided with a first through hole 30c and a driving drum provided with a plurality of first protrusions 311, the sub-screening drum is used to screen the grinding particles in the slurry, and the driving drum generates a certain cutting force during the rotation process, so that the grinding particles can be cut by the cutting force to form grinding particles with a smaller diameter, that is, the driving drum provides a certain power to allow the grinding particles to be ground.

[0049] In one embodiment, referring to Figure 1 and Figure 2 , a groove 20a is provided at one end of the driving mechanism 20 extending into the inner cavity 10a; the vertical sand mill also includes a fixed column 40 and a center tube 50, the fixed column 40 is arranged in the inner cavity 10a and connected to the bottom wall of the inner cavity 10a, the fixed column 40 and the end of the driving mechanism 20 adjacent to the feed port 10c are opposite and spaced apart; the center tube 50 is arranged in the inner cavity 10a, the center tube 50 passes through the fixed column 40 and extends into the groove 20a, and the end of the center tube 50 extending into the groove 20a is spaced apart from the groove wall of the groove 20a.

[0050] In this embodiment, it is configured so that when the slurry enters the groove 20a from the central tube 50, since the central tube 50 is penetrated through the groove 20a, the centrifugal force to which the slurry coming out of the central tube 50 is subjected is minimized, and the slurry can flow in an orderly manner along the gap between the central tube 50 and the groove 20a and the gap between the driving mechanism 20 and the fixed column 40, so that the slurry will not accumulate in the gap between the driving mechanism 20 and the fixed column 40, causing blockage of the central tube 50.

[0051] In one embodiment, referring to Figure 1 and Figure 2 , the outer wall of the fixed column 40 is provided with a plurality of third protrusions 41 at intervals, and the plurality of third protrusions 41 are arranged around the periphery of the fixed column 40. In this embodiment, by providing a plurality of third protrusions 41 on the outer wall of the fixed column 40, and the plurality of third protrusions 41 are arranged in a rectangular array; when the slurry enters the first flow channel 30a between the first rotating drum 31 and the driving mechanism 20, the plurality of third protrusions 41 can act as grinding media, collide with the grinding particles in the slurry to form grinding particles with a smaller diameter, thereby improving the grinding effect of the vertical sand mill.

[0052] In one embodiment, referring to Figure 1 and Figure 2 The driving mechanism 20 includes a motor, a main shaft 21 and a support shaft head 22. The motor is connected to the main shaft 21 by transmission. The end of the main shaft 21 facing away from the motor is connected to the support shaft head 22 by transmission. One end of the main shaft 21 and the support shaft head 22 extend into the inner cavity 10a and are rotatably arranged at the opening 10b. The sub-screening mechanism 30 is sleeved on the side wall of the end of the main shaft 21 extending into the inner cavity 10a. In this way, the main shaft 21 is connected to the first rotating drum 31 and the second rotating drum 32 of the sub-screening mechanism 30 through the support shaft head 22, thereby improving the tightness of the connection between the sub-screening mechanism 30 and the main shaft 21.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A vertical sand mill, characterized in that: The vertical sand mill comprises: A cylinder having an inner cavity; A driving mechanism, one end of which is rotatably disposed in the cylinder and extends into the inner cavity; and A screening mechanism is sleeved on the outer wall of the driving mechanism and spaced from the inner wall of the cylinder; the screening mechanism and the driving mechanism are enclosed to form a first flow channel, the screening mechanism and the cylinder are enclosed to form a second flow channel, the screening mechanism is provided with a first through hole and a second through hole, the first through hole and the second through hole are connected to the first flow channel and the second flow channel, and the diameter of the first through hole is different from the diameter of the second through hole; The driving mechanism drives the sieving mechanism to rotate, so that abrasive particles of different diameters enter the second flow channel from the first flow channel through the first through hole and the second through hole; The screening mechanism comprises: A first rotating drum is sleeved on the outer wall of the driving mechanism and spaced apart from the inner wall of the cylinder; the first rotating drum is spaced apart and provided with a plurality of the first through holes, and the plurality of the first through holes are arranged around the periphery of the first rotating drum; and The second rotating drum is sleeved on the outer wall of the driving mechanism and is spaced apart from the inner wall of the cylinder; the second rotating drum and the first rotating drum are sequentially arranged along the extension direction of the driving mechanism; the inner wall of the first rotating drum, the inner wall of the second rotating drum and the driving mechanism are enclosed to form the first flow channel, and the outer wall of the first rotating drum, the outer wall of the second rotating drum and the inner wall of the cylinder are enclosed to form the second flow channel; the second rotating drum is spaced apart with a plurality of the second through holes, and the plurality of the second through holes are arranged around the periphery of the second rotating drum; the diameter of the second through hole is smaller than the diameter of the first through hole; The screening mechanism further comprises a sleeve disposed between the cylinder body and the second rotating cylinder, the inner wall of the sleeve is provided with an internal thread, the outer wall of the second rotating cylinder is provided with an external thread, and the internal thread and the external thread are spaced apart to form a spiral channel; The outer wall of the first rotating drum and the inner wall of the cylinder body form a straight channel, and the spiral channel is connected to the straight channel to form the second flow channel.

2. The vertical sand mill according to claim 1, characterized in that: A direction perpendicular to the extension direction of the driving mechanism is defined as a first direction, the inner wall of the first rotating drum and the driving mechanism are enclosed to form a first section, the inner wall of the second rotating drum and the driving mechanism are enclosed to form a second section, the second section is connected to the first section, and forms the first flow channel; the width of the first section along the first direction is smaller than the width of the second section along the first direction.

3. The vertical sand mill according to claim 2, characterized in that: A plurality of third via holes are provided at an end of the second rotating drum adjacent to the first rotating drum, the plurality of third via holes connect the first flow channel and the second flow channel, and the plurality of third via holes are arranged around the periphery of the second rotating drum and are spaced apart from the plurality of second via holes; a diameter of the third via hole is smaller than a diameter of the first via hole and larger than a diameter of the second via hole.

4. The vertical sand mill according to claim 3, characterized in that: A plurality of fourth via holes are disposed at intervals at one end of the second rotating drum away from the first rotating drum, the plurality of fourth via holes connect the first flow channel and the second flow channel, the plurality of fourth via holes are disposed around the periphery of the second rotating drum, and are spaced apart from the plurality of second via holes and the plurality of third via holes; and the diameter of the fourth via hole is smaller than the diameter of the second via hole.

5. The vertical sand mill according to claim 4, characterized in that: A plurality of first protrusions are arranged at intervals on the outer wall of the first rotating drum, and the plurality of first protrusions are arranged around the periphery of the first rotating drum.

6. The vertical sand mill according to any one of claims 1 to 5, characterized in that: One end of the driving mechanism extending into the inner cavity is provided with a groove; The vertical sand mill also includes: a fixed column, disposed in the inner cavity and connected to the bottom wall of the inner cavity, the fixed column being opposite to and spaced from one end of the driving mechanism adjacent to the feed port; and A central tube is arranged in the inner cavity, passes through the fixing column and extends into the groove, and one end of the central tube extending into the groove is spaced from the groove wall of the groove.

7. The vertical sand mill according to claim 6, characterized in that: A plurality of third protrusions are arranged at intervals on the outer wall of the fixing column, and the plurality of third protrusions are arranged around the periphery of the fixing column.

8. The vertical sand mill according to any one of claims 1 to 5, characterized in that: The driving mechanism includes a motor, a main shaft and a supporting shaft head. The motor is drivingly connected to the main shaft, and the end of the main shaft facing away from the motor is drivingly connected to the supporting shaft head. One end of the main shaft and the supporting shaft head extend into the inner cavity and are rotatably arranged at the opening; the screening mechanism is sleeved on the side wall of one end of the main shaft extending into the inner cavity.

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