Sand mill centrifugal separation device and sand mill

Abstract

The application discloses a sand mill centrifugal separation device and a sand mill, relates to the technical field of sand mills, and discloses a sand mill centrifugal separation device which is installed on a sand mill body, wherein the sand mill body comprises a rotor and a grinding cylinder, and the sand mill centrifugal separation device comprises a separation cylinder and a scraping block. The separation cylinder is connected with the rotor of the sand mill and enables grinding balls in the sand mill to be located between the outer surface of the separation cylinder and the inner wall of the grinding cylinder of the sand mill. The separation cylinder rotates synchronously with the rotor of the sand mill, and the surface of the separation cylinder is provided with a through gap. The size of the grinding balls in the grinding cylinder is greater than the size of the gap. The scraping block is connected with the separation cylinder and can rotate synchronously with the separation cylinder. The scraping block can drive the material in the middle of the grinding cylinder to flow to the space between the separation cylinder and the inner wall of the grinding cylinder through the gap when the scraping block rotates with the separation cylinder. The scraping block is provided with a vibration motor. The sand mill can grind the material particles which do not meet the size requirements more quickly and effectively improves the grinding efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sand mill, more particularly to a sand mill centrifugal separation device and a sand mill. BACKGROUND

[0002] The sand mill is a widely used wet superfine grinding equipment, mainly used for grinding solid particles in the material to micron or even nanometer level. In the sand mill, a centrifugal separation device is generally provided, which is mainly installed near the discharge end of the rotor. The centrifugal separation device can separate the grinding medium (such as zirconia beads, glass beads, etc.) and the coarse particle material that does not meet the standard from the qualified material by centrifugal force, so that the qualified material can flow out of the discharge port through the filter screen.

[0003] At present, the conventional centrifugal separation device mainly comprises a separation cylinder, which is installed at the end of the intermediate rotor of the sand mill and near the discharge end of the grinding cylinder. The surface of the separation cylinder is provided with a gap, which is smaller than the diameter of the grinding medium, so that the grinding medium cannot pass through. The grinding medium is between the inner wall of the separation cylinder and the grinding cylinder, and the filter screen is in the middle of the separation cylinder. In this way, during the working process, the rotor drives the separation cylinder to rotate, and the rotation of the separation cylinder and the rotor causes the grinding medium and the coarse particle material that does not meet the standard to be close to the inner wall of the grinding cylinder (because the sizes of these two are large, the mass is large, and the centrifugal force is large), and the qualified material flows out of the middle of the separation cylinder through the gap on the surface of the separation cylinder, and then flows out of the discharge port through the filter screen. In this way, the separation of the grinding material, the grinding material that does not meet the standard and the grinding qualified material can be realized.

[0004] However, the above structure still has some defects, that is:

[0005] During the working process, it cannot be ensured that the material in the center of the separation cylinder is completely fine. As a result, the grinding balls are in the periphery and do not contact the middle, so that the material in the middle can only be continuously thrown out to the grinding ball activity area under the action of centrifugal force to continue grinding. Due to the fact that only part of the gap is provided on the separation cylinder, the instantaneous throughput of the material is relatively small, which makes the passing difficulty relatively high, resulting in that the coarse particle grinding material in the middle cannot flow out to the grinding ball grinding area quickly, and finally affecting the grinding efficiency. SUMMARY

[0006] In order to overcome the above-mentioned defects of the prior art, the present application provides a sand mill centrifugal separation device and a sand mill to solve the problems existing in the background art.

[0007] The present application provides the following technical scheme: a sand mill centrifugal separation device, characterized in that it is installed on a sand mill body, the sand mill body comprises a rotor and a grinding cylinder, and the sand mill centrifugal separation device comprises:

[0008] A separation cylinder is connected with the rotor of the sand mill and makes the grinding balls in the sand mill between the outer surface of the separation cylinder and the inner wall of the grinding cylinder of the sand mill, the separation cylinder rotates synchronously with the rotor of the sand mill, and the surface of the separation cylinder is provided with through slits, and the size of the grinding balls in the grinding cylinder is greater than the size of the slits;

[0009] A scraping block is connected with the separation cylinder and rotates synchronously with the separation cylinder, and the rotation of the scraping block with the separation cylinder drives the material in the middle of the grinding cylinder to flow through the slits to the space between the separation cylinder and the inner wall of the grinding cylinder;

[0010] The scraping block is provided with a vibration motor;

[0011] A vibration roller is slidingly connected with the scraping block and can rotate around its rotation shaft, and the rotation of the scraping block with the separation cylinder drives the vibration roller to rotate, and the rotation of the vibration roller makes it reciprocate on the scraping block to impact the filter screen;

[0012] The vibration of the vibration roller is irregular.

[0013] Further, the scraping block is provided with a cavity, a sliding seat is slidingly arranged in the cavity, the vibration roller is rotatably arranged in the sliding seat, the cavity extends to the surface of the scraping block and forms an opening on the surface of the scraping block, the opening faces the filter screen of the sand mill, the vibration roller extends out of the opening and contacts the surface of the filter screen, and an elastic component is connected between the sliding seat and the inner wall of the cavity, and the vibration roller is tightly attached to the surface of the filter screen under the action of the elastic component.

[0014] Further, the vibration roller is a cam, and a plurality of friction grooves are formed on the surface of the cam, and the rotation of the scraping block drives the vibration roller to rotate under the action of friction.

[0015] Further, the contact surface of the vibration roller and the filter screen comprises a first contact surface and a second contact surface, the ranges of the first contact surface and the second contact surface are equal, the rotation shaft of the vibration roller is closest to the filter screen when the first contact surface contacts the filter screen, and the rotation shaft of the vibration roller is farthest from the filter screen when the second contact surface contacts the filter screen.

[0016] Further, the elastic component comprises a first elastic member, a second elastic member and a sliding plate, the sliding plate is slidingly arranged in the cavity and is between the sliding seat and the inner wall of the cavity, the first elastic member is connected between the sliding plate and the sliding seat, and the second elastic member is connected between the sliding plate and the inner wall of the cavity, and the elasticity of the first elastic member is weaker than that of the second elastic member.

[0017] Further, the rotation of the vibration roller drives the sliding seat to slide and press the first elastic member, and the first elastic member drives the sliding plate to slide and press the second elastic member, and the rebound of the first elastic member is different from the rebound of the second elastic member.

[0018] Further, the balance cavity is arranged in the scraping block, an elastic air bag is arranged in the balance cavity, the elastic air bag is communicated with the cavity, a communicating channel is arranged between the balance cavity and the outer surface of the scraping block, a diaphragm is arranged in the communicating channel, the diaphragm only allows air to pass, when the sliding seat slides, the air in the elastic air bag is injected into the cavity or the air in the cavity is sucked to make the sliding seat stably slide in the cavity.

[0019] Further, the scraping block is arranged between the inner wall of the separation cylinder and the filter screen, the surface of the scraping block is provided with a guide surface, the guide surface is communicated with the gap on the separation cylinder, and when the scraping block rotates, the material in the middle of the grinding cylinder flows to the gap between the separation cylinder and the inner wall of the grinding cylinder under the action of the guide surface.

[0020] Further, the surface of the scraping block away from the separation cylinder is the same as the surface of the filter screen, and is in a fit state.

[0021] The application further discloses a sand mill comprising the sand mill centrifugal separation device and a sand mill body for grinding material, and the sand mill centrifugal separation device is arranged in the sand mill body.

[0022] The scraping block can guide the material in the middle of the separation cylinder to the grinding area of the grinding ball more quickly, so that the size-unqualified material particles can be ground more quickly, and the grinding efficiency is improved. In addition, the scraping block vibrates during use, which can separate the large-particle material and the small-particle material adhered together in the material in contact with the guide surface of the scraping block, and make the large particles flow to the grinding area and the small particles flow out of the filter screen under the action of the guide surface, so that the grinding efficiency is further improved. In addition, the vibration of the scraping block is transmitted to the filter screen, so that the filter screen vibrates. The vibration of the filter screen can shake the material particles stuck in the filter screen mesh, and can reduce the abrasion of the filter screen while ensuring that the scraping block can scrape the trapped particles on the surface of the filter screen, thereby prolonging the service life. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a three-dimensional structure schematic view of the separation cylinder of the application;

[0024] Figure 2 It is a first perspective view of the internal structure of the separation cylinder of the application;

[0025] Figure 3 It is a second perspective view of the internal structure of the separation cylinder of the application;

[0026] Figure 4 It is a schematic view of the internal structure of the scraping block of the application;

[0027] Figure 5 It is a three-dimensional structure schematic view of the sand mill of the application.

[0028] The reference signs are: 100, separation cylinder; 110, gap; 200, scraping block; 210, cavity; 220, sliding seat; 230, guide surface; 300, vibration roller; 310, first touch surface; 320, second touch surface; 330, elastic assembly; 331, first elastic member; 332, second elastic member; 333, sliding plate; 334, balance cavity; 335, elastic air bag; 400, rack; 500, motor; 600, gearbox; 700, grinding cylinder; 800, rotor; 900, filter screen. DETAILED DESCRIPTION

[0029] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. In addition, the forms of the structures described in the following embodiments are only examples and are not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0030] Referring to Figure 1 and Figure 2 , the present application provides a centrifugal separation device of a sand mill, which is installed on a sand mill body including a rotor 800 and a grinding cylinder 700. The centrifugal separation device of the sand mill includes a separation cylinder 100 and a scraping block 200. The separation cylinder 100 is connected with the rotor 800 of the sand mill and makes grinding balls in the sand mill between an outer surface of the separation cylinder 100 and an inner wall of the grinding cylinder 700 of the sand mill. The separation cylinder 100 rotates synchronously with the rotor 800 of the sand mill, and a gap 110 is formed through the surface of the separation cylinder 100. The size of the grinding balls in the grinding cylinder 700 is greater than the size of the gap 110. The scraping block 200 is connected with the separation cylinder 100 and rotates synchronously with the separation cylinder 100. The scraping block 200 drives the material in the middle of the grinding cylinder 700 to flow to the space between the separation cylinder 100 and the inner wall of the grinding cylinder 700 through the gap 110 when the scraping block 200 rotates with the separation cylinder 100.

[0031] As shown in Figure 3 and Figure 4 , the sand mill body further includes a filter screen 900, which is fixedly installed inside the grinding cylinder 700 and covers the discharge port of the grinding cylinder 700. The surface of the scraping block 200 away from the surface of the separation cylinder 100 is the same as the surface of the filter screen 900 and is in a close-fitting state. The scraping block 200 is installed between the inner wall of the separation cylinder 100 and the filter screen 900. The surface of the scraping block 200 is provided with a guide surface 230, which is in communication with the gap 110 on the separation cylinder 100. When the scraping block 200 rotates, the material in the middle of the grinding cylinder 700 flows to the space between the separation cylinder 100 and the inner wall of the grinding cylinder 700 through the gap 110 under the action of the guide surface 230.

[0032] Thus, in use, only need to inject the material to be ground into the grinding cylinder 700, then the material will flow to the rotor 800 and the inner wall of the grinding cylinder 700, and then be ground by the grinding balls in between, and after grinding, the qualified size of the material will flow out of the outlet of the grinding cylinder 700 through the filter screen 900, wherein the rotation of the rotor 800 of the sand mill will drive the separation cylinder 100 to rotate synchronously, at this time, under the action of centrifugal force, the grinding balls in the grinding cylinder 700 will be between the separation cylinder 100 and the inner wall of the grinding cylinder 700, and the material to be ground will be partially between the separation cylinder 100 and the inner wall of the grinding cylinder 700, and the other part will enter the separation cylinder 100 through the gap 110 on the separation cylinder 100, wherein the material in the separation cylinder 100 will be discharged from the outlet of the grinding cylinder 700 through the filter screen 900 if it meets the size standard, and then the material between the inner wall of the grinding cylinder 700 and the outer wall of the separation cylinder 100 will continue to fill into the separation cylinder 100, so as to realize continuous work.

[0033] And during the rotation of the separation cylinder 100, the scraper 200 will be driven to rotate synchronously, and the rotation of the scraper 200 will drive the material in the middle of the separation cylinder 100 to rotate, and in this process, under the action of the guide surface 230 on the scraper 200, the material in the separation cylinder 100 will be continuously guided to flow out of the gap 110 at a higher speed, so that the material in the middle of the separation cylinder 100 that does not meet the size standard can enter the grinding range of the grinding balls more quickly to speed up the grinding efficiency.

[0034] And during the grinding process, the applicant found that during the grinding process, the large particle material and the small particle material in the grinding material are easy to stick together, causing some qualified size material in the middle of the separation cylinder 100 to flow to the grinding area with the large particle material, at this time, if the scraper 200 is vibrated, it can promote the separation of the large particle material and the small particle material in the grinding material, thereby speeding up the flow of the large particle material to the grinding area of the grinding ball, for this reason, the applicant further optimizes the above scheme:

[0035] The scraper 200 is provided with a vibration motor, and the frequency of the vibration motor can be adjusted, and the vibration motor can drive the scraper 200 to vibrate.

[0036] Thus, during the rotation of the scraper 200, only need to start the vibration motor synchronously to drive the scraper 200 to vibrate, so that the material in contact with the guide surface 230 on the scraper 200 will be subjected to the vibration force and the guide force of the guide surface 230 at the same time, wherein the vibration force can promote the separation of the large particle material and the small particle material, and the guide force can accelerate the flow of the separated large particle material to the grinding area of the grinding ball, thereby further improving the separation efficiency and accelerating the grinding efficiency.

[0037] And, since the scraper 200 is in contact with the surface of the filter screen 900, such contact can effectively scrape away the large particles trapped on the surface of the filter screen 900 when the scraper 200 rotates, achieving the cleaning of the surface of the filter screen 900. However, if a small protrusion is generated on the surface of the filter screen 900 when the scraper 200 is in close contact with the filter screen 900, the end of the scraper 200 can be instantly stuck by the protrusion, causing wear to the surface and thus shortening the service life of the filter screen 900. However, after the above-mentioned solution, the vibration of the scraper 200 can make the end of the scraper 200 instantly move out of the small protrusion, reducing the wear between the scraper 200 and the surface of the filter screen 900 and ensuring the service life of the scraper 200 and the filter screen 900.

[0038] In addition, during use, if the filter screen 900 is impacted, the particles stuck in the mesh of the filter screen 900 can be effectively detached. Therefore, the above-mentioned solution is further optimized as follows:

[0039] Continuing to refer to Figure 1 and Figure 2 , a vibration roller 300 is arranged in the sand mill centrifugal separation device and is in sliding connection with the scraper 200. The vibration roller 300 can rotate around its own rotation shaft. The scraper 200 rotates with the separation cylinder 100 to drive the vibration roller 300 to rotate. Meanwhile, the rotation of the vibration roller 300 can make it reciprocate on the scraper 200 to impact the filter screen 900.

[0040] Continuing to refer to Figure 3 and Figure 4 , the scraper 200 is internally provided with a cavity 210. A sliding seat 220 is slidingly arranged in the cavity 210. The vibration roller 300 is rotatably arranged in the sliding seat 220. The cavity 210 extends to the surface of the scraper 200 and forms an opening on the surface of the scraper 200. The opening faces the filter screen 900 of the sand mill. Meanwhile, the vibration roller 300 extends out of the opening and is in contact with the surface of the filter screen 900. An elastic assembly 330 is connected between the sliding seat 220 and the inner wall of the cavity 210. The vibration roller 300 is in close contact with the surface of the filter screen 900 under the action of the elastic assembly 330. The elastic assembly 330 can be a spring.

[0041] As shown in Figure 4 , a balance cavity 334 is arranged in the scraper 200. An elastic air bag 335 is arranged in the balance cavity 334. The elastic air bag 335 is in communication with the cavity 210. Meanwhile, the balance cavity 334 and the outer surface of the scraper 200 are provided with a communication passage. A diaphragm is arranged in the communication passage. The diaphragm only allows air to pass through. When the sliding seat 220 slides, the air in the elastic air bag 335 can be injected into the cavity 210 or sucked from the cavity 210 to enable the sliding seat 220 to stably slide in the cavity 210.

[0042] Continuing to refer to Figure 4The shown vibration roller 300 is a cam, and a plurality of friction grooves are formed on the surface, which can increase the friction with the surface of the filter screen 900. When the scraping block 200 rotates, the vibration roller 300 will rotate under the action of the friction.

[0043] The contact surface of the vibration roller 300 and the filter screen 900 includes a first contact surface 310 and a second contact surface 320, and the ranges of the first contact surface 310 and the second contact surface 320 are equal. When the first contact surface 310 contacts the filter screen 900, the rotation shaft of the vibration roller 300 is closest to the filter screen 900. When the second contact surface 320 contacts the filter screen 900, the rotation shaft of the vibration roller 300 is farthest from the filter screen 900.

[0044] In this way, during the rotation of the scraping block 200, the vibration roller 300 will be moved synchronously. Since the vibration roller 300 is tightly attached to the surface of the filter screen 900 under the action of the elastic assembly 330, the vibration roller 300 will generate a friction force with the filter screen 900 to rotate itself. Since the vibration roller 300 is a cam, the rotation of the vibration roller 300 will drive the sliding seat 220 to slide in the cavity 210 to press the elastic assembly 330. When the contact surface of the vibration roller 300 and the filter screen 900 switches from the second contact surface 320 to the first contact surface 310, at this time, the rebound of the elastic assembly 330 will cause the sliding seat 220 to reset and then contact the surface of the filter screen 900 again. In this way, the reciprocating sliding of the vibration roller 300 is formed, and the vibration roller 300 impacts the filter screen 900. The impact force is much greater than the force transmitted to the filter screen 900 by the scraping block 200 through the vibration motor, so that a larger impact can be generated to make the particles blocked in the mesh of the filter screen 900 flow out, further enhancing the dredging effect on the filter screen 900.

[0045] Meanwhile, the applicant has also found in the research and development process that the irregular vibration of the vibration roller 300 can make the particles in the material receive forces of multiple angles and different sizes, which will further promote the flow of particles in the mesh of the filter screen 900. For this reason, the applicant further optimizes the above scheme:

[0046] As shown in Figure 4 The elastic assembly 330 includes a first elastic member 331, a second elastic member 332, and a sliding plate 333. The sliding plate 333 is slidingly installed in the cavity 210 and is between the sliding seat 220 and the inner wall of the cavity 210. The first elastic member 331 is connected between the sliding plate 333 and the sliding seat 220, and the second elastic member 332 is connected between the sliding plate 333 and the inner wall of the cavity 210. The elasticity of the first elastic member 331 is weaker than that of the second elastic member 332. The first elastic member 331 and the second elastic member 332 can both be springs.

[0047] Continuing as shown in Figure 4As shown, the rotation of the vibration roller 300 drives the sliding base 220 to slide to extrude the first elastic member 331, and the first elastic member 331 drives the sliding plate 333 to slide to extrude the second elastic member 332, and the rebound of the first elastic member 331 is different from the rebound of the second elastic member 332.

[0048] In this way, the vibration roller 300 generates different impact forces in the rotation process due to different rebound forces generated by the first elastic member 331 and the second elastic member 332, so that the impact force transmitted to the filter screen 900 is irregular, thereby further promoting the outflow of particles in the mesh of the filter screen 900.

[0049] The application also discloses a sand mill comprising the sand mill centrifugal separation device and a sand mill body for grinding materials, wherein the sand mill centrifugal separation device is installed in the sand mill body, and the sand mill body comprises a rack 400, a motor 500, a gearbox 600, a grinding cylinder 700, a rotor 800, grinding balls and a filter screen 900.

[0050] The sand mill can have all the advantages of the centrifugal separation device and is more convenient to use.

[0051] Finally, it should be noted that the drawings of the disclosed embodiments only involve the structures involved in the disclosed embodiments, and other structures can be referred to the general design, and in the case of no conflict, the same embodiment and different embodiments of the application can be combined with each other.

[0052] The above only describes the preferred embodiments of the application and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A centrifugal separation apparatus for a sand mill, characterised in that, Its installation is on the sand mill body, the sand mill body includes rotor (800) and grinding cylinder (700), the sand mill centrifugal separation device includes: The separation cylinder (100) is connected with the rotor (800) of the sand mill, and the grinding balls in the sand mill are between the outer surface of the separation cylinder (100) and the inner wall of the grinding cylinder (700) of the sand mill, the separation cylinder (100) rotates synchronously with the rotor (800) of the sand mill, and the surface of the separation cylinder (100) is provided with a through gap (110), and the size of the grinding balls in the grinding cylinder (700) is greater than the size of the gap (110); The scraping block (200) is connected with the separation cylinder (100) and can rotate synchronously with the separation cylinder (100), and the scraping block (200) can drive the material in the middle of the grinding cylinder (700) to flow through the gap (110) to between the separation cylinder (100) and the inner wall of the grinding cylinder (700) when the separation cylinder (100) rotates. The scraping block (200) is provided with a vibration motor; The vibration roller (300) is slidingly connected with the scraping block (200), and the vibration roller (300) can rotate around its own rotating shaft, and the scraping block (200) can drive the vibration roller (300) to rotate when the separation cylinder (100) rotates, and the self-rotation of the vibration roller (300) can make it reciprocate on the scraping block (200) to impact the filter screen (900); The vibration of the vibration roller (300) is irregular; The sand mill body further comprises a filter screen (900) fixedly installed inside the grinding cylinder (700) and covering the discharge port of the grinding cylinder (700), the surface of the scraping block (200) away from the separation cylinder (100) is the same as the surface of the filter screen (900) and is in a fitted state, the scraping block (200) is installed between the inner wall of the separation cylinder (100) and the filter screen (900), the surface of the scraping block (200) is provided with a guide surface (230) in communication with the gap (110) on the separation cylinder (100), and the material in the middle of the grinding cylinder (700) will flow through the gap (110) to between the separation cylinder (100) and the inner wall of the grinding cylinder (700) under the action of the guide surface (230) when the scraping block (200) rotates. The inside of the scraping block (200) is provided with a cavity (210), the inside of the cavity (210) is slidingly provided with a sliding seat (220), the vibration roller (300) is rotatably installed in the sliding seat (220), the cavity (210) extends to the surface of the scraping block (200) and forms an opening on the surface of the scraping block (200), the opening faces the filter screen (900) of the sand mill, the vibration roller (300) extends out of the opening and contacts the surface of the filter screen (900), and the elastic assembly (330) is connected between the sliding seat (220) and the inner wall of the cavity (210), and the vibration roller (300) is tightly attached to the surface of the filter screen (900) under the action of the elastic assembly (330).

2. The sander centrifugal separation device of claim 1, wherein: The vibration roller (300) is a cam, and a plurality of friction grooves are formed on the surface of the vibration roller (300), and the vibration roller (300) rotates under the action of friction when the scraping block (200) rotates.

3. The sander centrifugal separation device of claim 2, wherein: The contact surface of the vibration roller (300) and the filter screen (900) comprises a first contact surface (310) and a second contact surface (320), and the ranges of the first contact surface (310) and the second contact surface (320) are equal, when the first contact surface (310) contacts the filter screen (900), the rotation shaft of the vibration roller (300) is closest to the filter screen (900), and when the second contact surface (320) contacts the filter screen (900), the rotation shaft of the vibration roller (300) is farthest from the filter screen (900).

4. The sander centrifugal separation device of claim 1, wherein: The elastic assembly (330) comprises a first elastic member (331), a second elastic member (332) and a sliding plate (333), the sliding plate (333) is slidingly installed in the cavity (210), and the sliding plate (333) is between the sliding seat (220) and the inner wall of the cavity (210), the first elastic member (331) is connected between the sliding plate (333) and the sliding seat (220), the second elastic member (332) is connected between the sliding plate (333) and the inner wall of the cavity (210), and the elasticity of the first elastic member (331) is weaker than that of the second elastic member (332).

5. The sander centrifugal separation device of claim 4, wherein: The rotation of the vibration roller (300) drives the sliding seat (220) to slide to press the first elastic member (331), the first elastic member (331) drives the sliding plate (333) to slide to press the second elastic member (332), and the rebound of the first elastic member (331) forms an impact different from that of the second elastic member (332).

6. The sander centrifugal separation device of claim 1, wherein: The balance cavity (334) is arranged in the inside of the scraping block (200), the elastic air bag (335) is installed in the inside of the balance cavity (334), the elastic air bag (335) is communicated with the cavity (210), the balance cavity (334) and the outer surface of the scraping block (200) are provided with a communication channel, a diaphragm is installed in the communication channel, the diaphragm only allows air to pass through, when the sliding seat (220) slides, the air in the elastic air bag (335) is injected into the cavity (210) or air is sucked from the cavity (210) to enable the sliding seat (220) to stably slide in the cavity (210).

7. A sand mill comprising the sand mill centrifugal separation device according to any one of claims 1-6 and a sand mill body for grinding materials, and the sand mill centrifugal separation device is installed in the sand mill body.

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