Anti-blocking mechanism, method and sand mill with the anti-blocking mechanism

Abstract

The present invention relates to the technical field of sand mills, and discloses an anti-blocking mechanism, a method, and a sand mill with the anti-blocking mechanism, comprising: a filter assembly arranged in a grinding cylinder; the filter assembly comprises: a first filter unit connected to the grinding cylinder and a second filter unit connected to a driving mechanism, the first filter unit and the second filter unit can be relatively rotated and relatively moved in the axial direction through the driving mechanism; the size of the combined filter hole formed after the first filter unit and the second filter unit are attached is a preset filter size. The combined filter hole formed after the two filter units are attached effectively filters the slurry, and since the size of the unit filter hole is larger than the size of the combined filter hole, the two filter units can effectively clean the solid materials in the combined filter hole when they are relatively rotated or at a certain distance, and can timely and efficiently clean the two filter units, and take effective anti-blocking measures to prevent blockage from affecting the grinding efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mills, and more particularly to an anti-blocking mechanism, a method and a sand mill with the anti-blocking mechanism. Background Art

[0002] Sand mills are mainly used for wet grinding of chemical liquid products. According to their performance, they can be roughly divided into horizontal sand mills, basket sand mills, vertical sand mills, etc. Sand mills are mainly composed of a machine body, a grinding cylinder, a sand milling disc (push rod), a grinding medium, a motor and a feed pump. The speed of feeding is controlled by the feed pump. Driven by the rotating sand milling disc, the grinding medium grinds the slurry entering the grinding cylinder, so that the solid materials therein are refined and qualified slurry flows out through the filter gap or sieve hole smaller than the particle size of the grinding medium.

[0003] In the prior art, the sieve holes are easily clogged and are usually cleaned only when clogged. However, this will affect the grinding efficiency. Therefore, it is necessary to propose an anti-blocking mechanism, method and a sand mill with the anti-blocking mechanism, which can prevent the sieve holes from being clogged, so as to solve the problems existing in the prior art. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above-mentioned problems, the present invention provides an anti-blocking mechanism, comprising: a filter assembly arranged in a grinding cylinder; the filter assembly comprises: a first filter unit connected to the grinding cylinder and a second filter unit connected to a driving mechanism, the first filter unit and the second filter unit can rotate relative to each other and move relative to each other in the axial direction through the driving mechanism; the size of the combined filter hole formed after the first filter unit and the second filter unit are fitted together is a preset filtering size.

[0006] Preferably, both the first filter unit and the second filter unit are provided with unit filter holes, and the size of the unit filter holes is larger than the preset filter size and smaller than the size of the grinding particles in the grinding cylinder.

[0007] Preferably, the first filter unit is provided with a first receiving groove, a first unit brush is provided in the first receiving groove, and the first unit brush is arranged lower than the notch of the first receiving groove; the second filter unit is correspondingly provided with a second receiving groove, a second unit brush is provided in the second receiving groove, and the second unit brush is arranged lower than the notch of the second receiving groove.

[0008] Preferably, the first unit brush can be limited in the first accommodating groove, or the first unit brush can be separated from the first accommodating groove and connected to the second unit brush;

[0009] The second unit brush can be limited in the second accommodating groove, or the second unit brush can be separated from the second accommodating groove and connected to the first unit brush.

[0010] Preferably, the first unit brush and the second unit brush both include: a rod body, the cross-section of the rod body is semicircular, and a brush body is arranged on the arc surface of the rod body; the distance from the plane of the rod body to the notch of the first accommodating groove or the second accommodating groove where it is located is a set distance.

[0011] Preferably, first permanent magnets are respectively provided at both ends of the rod body, and first electromagnets for generating adsorption with the first permanent magnets are respectively provided in the first receiving groove and the second receiving groove;

[0012] The two ends of the arc surface of the rod body are respectively provided with second permanent magnets, and the first accommodating groove and the second accommodating groove are respectively provided with second electromagnets for generating adsorption or repulsion with the second permanent magnets.

[0013] Preferably, a first permanent magnet sheet is provided on one plane side of the rod body of the first unit brush, and a second permanent magnet sheet is provided on one plane side of the rod body of the second unit brush, and the first permanent magnet sheet and the second permanent magnet sheet can be adsorbed to each other.

[0014] A sand mill comprises the anti-blocking mechanism described in the present invention, wherein the anti-blocking mechanism is arranged in a grinding cylinder, and the grinding cylinder is provided with a feed port, a return port and a discharge port, the feed port is arranged on a side away from a filter assembly, the return port is arranged on a side of the filter assembly close to the feed port, and the discharge port is arranged on a side of the filter assembly away from the feed port; a feed pipe is arranged at the feed port, and the feed pipe and the return port are connected through a first return pipe; a discharge pipe is arranged at the discharge port, and one side of the discharge pipe is connected to the feed pipe through a second return pipe.

[0015] A method for preventing blocking of a sand mill, applied to the sand mill of the present invention, comprising:

[0016] When the grinding cylinder is working, the anti-blocking mechanism executes the first cleaning mode according to the set interval time, and at the same time, the return port is connected with the feed port through the first return pipe, the discharge port is connected with the feed port through the second return pipe, and the feeding and discharging are stopped;

[0017] After the grinding cylinder has finished working, the anti-blocking mechanism executes the second cleaning mode and injects cleaning liquid into the grinding cylinder at the same time.

[0018] Preferably, the first cleaning mode is: when the first filter unit and the second filter unit are attached to each other, the first filter unit and the second filter unit are relatively rotated by the driving mechanism;

[0019] The second cleaning mode is: the first filter unit and the second filter unit are relatively moved to a first preset distance by a driving mechanism, and after the first unit brush and the second unit brush are connected, the first filter unit and the second filter unit are controlled to rotate relative to each other, and the first unit brush is used to clean the first filter unit, and the second unit brush is used to clean the second filter unit.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The anti-blocking mechanism, method and sand mill with the anti-blocking mechanism described in the present invention can effectively filter the slurry through the combined filter hole formed by the bonding of the first filter unit and the second filter unit, and because the unit filter hole size of each filter unit is larger than the combined filter hole size, the two filter units can effectively clean out the solid materials in the combined filter hole when they are relatively rotated or at a certain distance from each other; the first filter unit and the second filter unit can be cleaned timely and efficiently, and effective anti-blocking measures can be taken to prevent the grinding efficiency from being affected when blockage occurs, thereby achieving the purpose of anti-blocking.

[0022] The anti-blocking mechanism, method and sand mill with the anti-blocking mechanism described in the present invention, as well as other advantages, objectives and features of the present invention will be reflected in part through the following description, and will also be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of the anti-blocking mechanism of the present invention in the grinding cylinder;

[0025] Figure 2 It is a partial structural schematic diagram of the anti-blocking mechanism of the present invention;

[0026] Figure 3 It is a front structural schematic diagram of the anti-blocking mechanism of the present invention;

[0027] Figure 4 It is a schematic diagram of the exploded structure of the anti-blocking mechanism of the present invention;

[0028] Figure 5 It is a partial cross-sectional structural schematic diagram of the anti-blocking mechanism of the present invention;

[0029] Figure 6 It is a partial structural schematic diagram of the first unit brush in the anti-blocking mechanism of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the anti-blocking mechanism of the present invention when the first unit brush is separated from the first containing groove and connected to the second unit brush;

[0031] Figure 8 It is a structural schematic diagram of the anti-blocking mechanism of the present invention when the second unit brush is separated from the second containing groove and connected to the first unit brush;

[0032] Fig. 9 It is a schematic diagram of the internal structure of the grinding cylinder in the sand mill described in the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0034] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0035] like Figure 1-Figure 3 As shown, the present invention provides an anti-blocking mechanism, comprising: a filter assembly 2 arranged in a grinding cylinder 1; the filter assembly 2 comprises: a first filter unit 3 connected to the grinding cylinder 1 and a second filter unit 4 connected to a driving mechanism 5, the first filter unit 3 and the second filter unit 4 can be relatively rotated and relatively moved in the axial direction through the driving mechanism 5; the size of a combined filter hole 6 formed after the first filter unit 3 and the second filter unit 4 are fitted together is a preset filtering size.

[0036] In the above scheme, the preset filter size is: the minimum size that allows the qualified solid materials in the slurry to pass through after grinding and refinement.

[0037] Furthermore, each of the first filter unit 3 and the second filter unit 4 is provided with a unit filter hole 7 , and the size of the unit filter hole 7 is larger than a preset filter size and smaller than the size of the grinding particles in the grinding cylinder 1 .

[0038] During filtration, the first filter unit 3 and the second filter unit 4 remain in contact with each other, and the combined filter holes 6 formed can effectively block unqualified solid materials in the slurry and allow the refined and qualified slurry to pass through;

[0039] There are two anti-blocking measures: the first is a method in which the two filter units rotate relative to each other, and the second is a method in which the two filter units are relatively far away from each other;

[0040] When the first filter unit 3 and the second filter unit 4 rotate relative to each other, if there is solid material blocking the combined filter hole 6, the rotation causes the positions of the unit filter holes 7 of the two filter units to change relative to each other, thereby squeezing the solid material (rotation reduces the size of the combined filter hole 6) or releasing it (rotation increases the size of the combined filter hole 6), thereby preventing the solid material from being blocked in the combined filter hole 6;

[0041] When the first filter unit 3 and the second filter unit 4 move away from each other and are at a certain distance, the combined filter hole 6 disappears, and the size of the unit filter hole 7 on each filter unit is larger than the preset filter size, so that the solid material blocked in the combined filter hole 6 is detached, and if the cleaning operation is performed when the grinding cylinder 1 is working, the flow rate of the slurry in the grinding cylinder 1 can be increased, thereby impacting the unit filter hole 7 to prevent clogging; in addition, during the operation of the sand mill, the filter assembly 2 can be cleaned according to the set interval time to achieve the purpose of preventing clogging.

[0042] Through the above technical solution, the combined filter hole 6 formed by the bonding of the first filter unit 3 and the second filter unit 4 can effectively filter the slurry, and because the size of the unit filter hole 7 of each filter unit is larger than the size of the combined filter hole 6, the two filter units can effectively clean up the solid materials in the combined filter hole 6 when they are relatively rotated or at a certain distance from each other, thereby achieving the purpose of preventing blockage.

[0043] like Figure 4-Figure 5 As shown, in one embodiment, the first filter unit 3 is provided with a first accommodating groove 31, and a first unit brush 32 is provided in the first accommodating groove 31, and the first unit brush 32 is arranged lower than the notch of the first accommodating groove 31; the second filter unit 4 is correspondingly provided with a second accommodating groove 41, and a second unit brush 42 is provided in the second accommodating groove 41, and the second unit brush 42 is arranged lower than the notch of the second accommodating groove 41.

[0044] Further, the first unit brush 32 can be limited in the first accommodating groove 31, or the first unit brush 32 can be separated from the first accommodating groove 31 and connected to the second unit brush 42;

[0045] The second unit brush 42 can be limited in the second accommodating groove 41 , or the second unit brush 42 can be separated from the second accommodating groove 41 and connected to the first unit brush 32 .

[0046] The lengths of the first unit brush 32 and the second unit brush 42 are sufficient to clean all the unit filter holes 7 .

[0047] In this embodiment, on the basis of the second anti-blocking measure (the two filter units are relatively far away from each other), an additional anti-blocking operation is added, that is, after the grinding cylinder 1 finishes working, the first unit brush 32 and the second unit brush 42 are used to clean the first filter unit 3 and the second filter unit 4 respectively to remove the slurry adhering to the unit filter holes 7;

[0048] Specifically, when the two filter units are attached to each other and rotate relative to each other, the first unit brush 32 is limited in the first receiving groove 31, and the second unit brush 42 is limited in the second receiving groove 41. Both unit brushes do not protrude from the receiving groove, and will not affect the relative rotation of the two filter units; Figure 7 As shown, when the first unit brush 32 is needed, the first unit brush 32 is separated from the first accommodating groove 31, and the first unit brush 32 is connected to the second unit brush 42, so that a part of the first unit brush 32 is exposed, and then the two filter units are separated by a first preset distance (the distance at which the first unit brush 32 can effectively clean the first filter unit 3), and then the two filter units are relatively rotated, so that the first filter unit 3 can be cleaned; as shown in FIG. Figure 8 As shown, the principle of using the second unit brush 42 is the same as the principle of the first unit brush 32, which will not be repeated here.

[0049] like Figure 5 and Figure 6 As shown, further, the first unit brush 32 and the second unit brush 42 both include: a rod body 8, the cross-section of the rod body 8 is semicircular, and a brush body 9 is provided on the arc surface of the rod body 8; the distance from the plane of the rod body 8 to the notch of the first accommodating groove 31 or the second accommodating groove 41 where it is located is a set distance.

[0050] The setting of the set distance enables a portion of the first unit brush 32 to be located in the second receiving groove 41 , or a portion of the second unit brush 42 to be located in the first receiving groove 31 when the first unit brush 32 is connected to the second unit brush 42 .

[0051] like Figure 5 As shown, in one embodiment, first permanent magnets 10 are respectively provided at both ends of the rod body 8, and first electromagnets 11 for generating adsorption with the first permanent magnets 10 are respectively provided in the first receiving groove 31 and the second receiving groove 41;

[0052] The second permanent magnets 12 are respectively disposed at both ends of the arc surface of the rod body 8 , and the first accommodating groove 31 and the second accommodating groove 41 are respectively disposed with second electromagnets 13 for generating adsorption or repulsion with the second permanent magnets 12 .

[0053] When the first unit brush 32 and the second unit brush 42 are respectively limited in the first accommodation groove 31 and the second accommodation groove 41, the first electromagnet 11 is not energized, and the second electromagnet 13 is energized to produce an adsorption effect on the second permanent magnet 12, thereby achieving limitation;

[0054] When the first unit brush 32 is needed for cleaning, the first unit brush 32 is separated from the first receiving groove 31, and the first unit brush 32 is connected to the second unit brush 42, that is, the second electromagnet 13 in the first receiving groove 31 produces a repulsive effect on the second permanent magnet 12 on the first unit brush 32, and forms a pushing effect on the first unit brush 32, so that it approaches the second unit brush 42. At the same time, the first electromagnet 11 in the second receiving groove 41 is energized to produce an adsorption effect on the first permanent magnet 10 on the first unit brush 32, and a part of the first unit brush 32 is limited in the second receiving groove 41; then the two filter units are first moved away from each other and then rotated relative to each other to achieve cleaning;

[0055] When the second unit brush 42 is needed for cleaning, the two filter units are first brought close to each other and then the first electromagnet 11 in the second receiving groove 41 is powered off to prevent the first permanent magnet 10 on the first unit brush 32 from acting, so that the second electromagnet 13 in the first receiving groove 31 has an adsorption effect on the second permanent magnet 12 on the first unit brush 32, so that the first unit brush 32 is limited in the first receiving groove 31, and then the second unit brush 42 is used in the same way as the first unit brush 32, so that a part of it is limited in the first receiving groove 31, and then the two filter units are first moved away from each other and then rotated relative to each other to achieve cleaning.

[0056] like Figure 5 As shown, further, a first permanent magnet piece 14 is provided on a plane side of the rod body 8 of the first unit brush 32, and a second permanent magnet piece 15 is provided on a plane side of the rod body 8 of the second unit brush 42, and the first permanent magnet piece 14 and the second permanent magnet piece 15 can be adsorbed to each other.

[0057] When the first unit brush 32 and the second unit brush 42 are connected, the mutual adsorption of the first permanent magnet piece 14 and the second permanent magnet piece 15 can promote the connection between the two and make the connection more firm; when the first unit brush 32 and the second unit brush 42 are away from each other, the adsorption force generated by the second electromagnet 13 on the second permanent magnet 12 is greater than the adsorption force of the first permanent magnet piece 14 and the second permanent magnet piece 15, thereby facilitating the change of the positions of the two unit brushes.

[0058] Through the above scheme, the two unit brushes can be hidden in the two filter units and can be exposed when needed to achieve the cleaning of the filter units and achieve the effect of anti-blocking; and the disassembly and installation of the two unit brushes is also convenient. It is only necessary to cut off the power of all the electromagnets to take the unit brushes out of the receiving groove for easy replacement.

[0059] like Fig. 9 As shown, a sand mill includes the anti-blocking mechanism described in the present invention, the anti-blocking mechanism is arranged in a grinding cylinder 1, and the grinding cylinder 1 is provided with a feed port 16, a return port 17 and a discharge port 18, the feed port 16 is arranged on a side away from the filter assembly 2, the return port 17 is arranged on a side of the filter assembly 2 close to the feed port 16, and the discharge port 18 is arranged on a side of the filter assembly 2 away from the feed port 16; a feed pipe 19 is provided at the feed port 16, the feed pipe 19 and the return port 17 are connected by a first return pipe 20, and a discharge pipe 21 is provided at the discharge port 18, and one side of the discharge pipe 21 is connected to the feed pipe 19 through a second return pipe 22.

[0060] Furthermore, a sanding mechanism 23 for grinding slurry is provided in the grinding cylinder 1 , a pump body 24 is provided near the feed port 16 of the feed pipe 19 , and a discharge port 25 is provided on the grinding cylinder 1 .

[0061] The ground slurry can be pumped into the grinding cylinder 1 through the pump body 24, and the solid materials in the unqualified ground slurry can be allowed to enter the grinding cylinder 1 again from the feed port 16 through the return port 17 and the first return pipe 20. When the sand mill is working and being cleaned, the slurry discharged from the discharge port 18 can be returned to the grinding cylinder 1 through the second return pipe 22 to prevent unqualified slurry from being discharged from the discharge port 18.

[0062] A method for preventing blocking of a sand mill, applied to the sand mill of the present invention, comprising:

[0063] When the grinding cylinder 1 is working, the anti-blocking mechanism executes the first cleaning mode according to the set interval time, and at the same time, the return port 17 is connected with the feed port 16 through the first return pipe 20, and the discharge port 18 is connected with the feed port 16 through the second return pipe 22, and the feeding and discharging are stopped;

[0064] After the grinding cylinder 1 finishes working, the anti-blocking mechanism executes the second cleaning mode and injects cleaning liquid into the grinding cylinder 1 at the same time.

[0065] The cleaning liquid may be clean water or a liquid that can dissolve the slurry.

[0066] When cleaning is performed while the grinding drum 1 is in operation, it is not necessary to stop the machine, and the slurry can be allowed to circulate in the grinding drum 1 to facilitate effective cleaning of the two filter units in the first cleaning mode;

[0067] After the grinding cylinder 1 has finished working, a second cleaning mode may be used, in which a cleaning liquid may be injected into the grinding cylinder 1 , and then the waste liquid after cleaning is discharged from the discharge port 25 .

[0068] Furthermore, the first cleaning mode is: when the first filter unit 3 and the second filter unit 4 are attached to each other, the first filter unit 3 and the second filter unit 4 are relatively rotated by the driving mechanism 5;

[0069] Alternatively, the first cleaning mode is: the first filter unit 3 and the second filter unit 4 are relatively moved to a second preset distance by the driving mechanism 5, and then the flow speed of the slurry in the grinding cylinder 1 is increased;

[0070] Alternatively, the first cleaning mode is: when the first filter unit 3 and the second filter unit 4 are attached to each other, the first filter unit 3 and the second filter unit 4 are relatively rotated by the driving mechanism 5; and the first filter unit 3 and the second filter unit 4 are relatively moved to a second preset distance by the driving mechanism 5, and then the flow speed of the slurry in the grinding cylinder 1 is increased; a combination of the above two forms;

[0071] The second cleaning mode is: the first filter unit 3 and the second filter unit 4 are relatively moved to a first preset distance by the driving mechanism 5, and after the first unit brush 32 and the second unit brush 42 are connected, the first filter unit 3 and the second filter unit 4 are controlled to rotate relative to each other, and the first unit brush 32 is used to clean the first filter unit 3, and the second unit brush 42 is used to clean the second filter unit 4.

[0072] The second preset distance is greater than the first preset distance.

[0073] Through the above method, the first filter unit 3 and the second filter unit 4 can be cleaned timely and efficiently, and effective anti-blocking measures can be taken to prevent the grinding efficiency from being affected when blockage occurs.

[0074] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An anti-blocking mechanism, characterized in that: include: A filter assembly (2) disposed in the grinding cylinder (1); The filter assembly (2) comprises: a first filter unit (3) connected to the grinding cylinder (1) and a second filter unit (4) connected to a driving mechanism (5); the first filter unit (3) and the second filter unit (4) can be relatively rotated and relatively moved in the axial direction by the driving mechanism (5); the size of the combined filter hole (6) formed after the first filter unit (3) and the second filter unit (4) are attached is a preset filter size; The first filter unit (3) is provided with a first receiving groove (31), a first unit brush (32) is provided in the first receiving groove (31), and the first unit brush (32) is arranged below the notch of the first receiving groove (31); the second filter unit (4) is correspondingly provided with a second receiving groove (41), a second unit brush (42) is provided in the second receiving groove (41), and the second unit brush (42) is arranged below the notch of the second receiving groove (41); The first unit brush (32) can be limited in the first accommodating groove (31), or the first unit brush (32) can be separated from the first accommodating groove (31) and connected to the second unit brush (42); The second unit brush (42) can be limited in the second containing groove (41), or the second unit brush (42) can be separated from the second containing groove (41) and connected to the first unit brush (32); The first unit brush (32) and the second unit brush (42) both comprise: a rod body (8), the cross section of the rod body (8) is semicircular, and a brush body (9) is provided on the arc surface of the rod body (8); the distance from the plane of the rod body (8) to the notch of the first accommodating groove (31) or the second accommodating groove (41) where the rod body (8) is located is a set distance; A first permanent magnet (10) is provided at each end of the rod body (8), and a first electromagnet (11) for generating an adsorption effect with the first permanent magnet (10) is provided in each of the first receiving groove (31) and the second receiving groove (41); Second permanent magnets (12) are respectively provided at both ends of the arc surface of the rod body (8), and second electromagnets (13) for generating an adsorption or repulsion effect with the second permanent magnet (12) are respectively provided in the first accommodating groove (31) and the second accommodating groove (41).

2. The anti-blocking mechanism according to claim 1, characterized in that: The first filter unit (3) and the second filter unit (4) are both provided with unit filter holes (7), the size of the unit filter holes (7) being larger than a preset filter size and smaller than the size of the grinding particles in the grinding cylinder (1).

3. The anti-blocking mechanism according to claim 1, characterized in that: A first permanent magnet piece (14) is provided on one plane side of the rod body (8) of the first unit brush (32), and a second permanent magnet piece (15) is provided on one plane side of the rod body (8) of the second unit brush (42), and the first permanent magnet piece (14) and the second permanent magnet piece (15) are capable of being attracted to each other.

4. A sand mill, characterized in that: The invention comprises the anti-blocking mechanism according to any one of claims 1 to 3, wherein the anti-blocking mechanism is arranged in a grinding cylinder (1), and the grinding cylinder (1) is provided with a feed port (16), a return port (17) and a discharge port (18), wherein the feed port (16) is arranged on a side away from the filter assembly (2), the return port (17) is arranged on a side of the filter assembly (2) close to the feed port (16), and the discharge port (18) is arranged on a side of the filter assembly (2) away from the feed port (16); a feed pipe (19) is arranged at the feed port (16), and the feed pipe (19) and the return port (17) are connected via a first return pipe (20); a discharge pipe (21) is arranged at the discharge port (18), and one side of the discharge pipe (21) is connected to the feed pipe (19) via a second return pipe (22).

5. A method for preventing blockage of a sand mill, characterized in that: The sand mill as claimed in claim 4, comprising: When the grinding cylinder (1) is working, the anti-blocking mechanism executes a first cleaning mode according to a set interval time, and at the same time, the return port (17) is connected to the feed port (16) through the first return pipe (20), the discharge port (18) is connected to the feed port (16) through the second return pipe (22), and the feeding and discharging are stopped; After the grinding cylinder (1) has finished working, the anti-blocking mechanism executes the second cleaning mode and simultaneously injects cleaning liquid into the grinding cylinder (1).

6. The method for preventing blockage of a sand mill according to claim 5, characterized in that: The first cleaning mode is: when the first filter unit (3) and the second filter unit (4) are in contact with each other, the first filter unit (3) and the second filter unit (4) are caused to rotate relative to each other by a driving mechanism (5); The second cleaning mode is as follows: the first filter unit (3) and the second filter unit (4) are relatively moved to a first preset distance by a driving mechanism (5), and after the first unit brush (32) and the second unit brush (42) are connected, the first filter unit (3) and the second filter unit (4) are controlled to rotate relative to each other, and the first unit brush (32) is used to clean the first filter unit (3), and the second unit brush (42) is used to clean the second filter unit (4).

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