Cleaning system for sand mill and sand mill

Abstract

The invention relates to the technical field of sand mills, and particularly discloses a cleaning system for a sand mill and the sand mill.The cleaning system comprises a detection module used for detecting whether a screen located in a grinding cylinder is blocked or not in real time when the grinding machine works and outputting a detection result; the cleaning module is used for cleaning the screen when the screen is blocked; and the control module controls the cleaning module to execute the first cleaning mode when the grinding machine works. According to the sand mill, the blockage condition of the screen can be detected in real time in the grinding process through the detection module, when blockage occurs, the cleaning module can be controlled to work through the control module, the screen is cleaned in real time, and therefore the feeding flow does not need to be reduced, cleaning can be conducted when the sand mill works, shutdown operation is not needed, and the grinding efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mills, and more particularly to a cleaning system for sand mills and the sand mills. 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, if the sand mill does not work for a long time, before using it, you should check whether the screen is blocked. If blocked, it is generally cleaned with a corresponding solvent. Since the mesh holes on the screen are easily blocked by solid materials in the slurry, and the sand mill of the prior art lacks the function of monitoring the blockage of the screen and cleaning the screen when working, if blockage occurs during operation, it is not easy to be found, which will affect the grinding efficiency. Therefore, it is necessary to propose a cleaning system for a sand mill and a sand mill to at least partially 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] To at least partially solve the above problems, the present invention provides a cleaning system for a sand mill, comprising:

[0006] The detection module is used to detect in real time whether the screen in the grinding cylinder is blocked when the grinder is working, and output the detection result;

[0007] A cleaning module is used to clean the screen when the screen is clogged;

[0008] The control module controls the cleaning module to execute the first cleaning mode when the grinding machine is working.

[0009] Preferably, the control module is also used to control the cleaning module to execute the second cleaning mode after the grinding machine stops working.

[0010] Preferably, the detection module comprises:

[0011] Pressure sensor, used to detect whether the screen is blocked;

[0012] In which, an annular groove for the movement of the screen is provided in the grinding cylinder, and the side of the annular groove away from the feed port of the grinding cylinder is connected to the screen through an elastic part, and the pressure sensor is arranged on the side where the screen is connected to the elastic part, or on the side where the annular groove is connected to the elastic part.

[0013] Preferably, the detection module further includes:

[0014] A feed flow acquisition unit, used to acquire the feed flow of the slurry entering the grinding cylinder;

[0015] The first judgment unit is used to judge whether the difference between the current pressure value detected by the pressure sensor and the set pressure value corresponding to the current feed flow rate is within a set error range. If so, the detection result is that the screen is not blocked; if not, the detection result is that the screen is blocked.

[0016] Preferably, the cleaning module comprises: a support plate, which is arranged on a side of the screen away from the feed inlet of the grinding cylinder, and a cleaning part is arranged on a side of the support plate close to the screen, and the cleaning part corresponds to the screen hole of the screen; a driving part, which is used to drive the support plate to move along the axial direction of the grinding cylinder;

[0017] Wherein, the first cleaning mode is: the screen is cleaned by inserting the cleaning part into the screen hole accordingly.

[0018] Preferably, the cleaning module further comprises: a nozzle disposed on the support plate, the nozzle being used to provide a cleaning medium to the screen;

[0019] Wherein, the second cleaning mode is: providing a cleaning medium to the screen through a nozzle to clean the screen; the cleaning medium is gas or liquid.

[0020] Preferably, an electromagnet is provided on the side of the annular groove close to the feed port, and a permanent magnet is provided on the side of the screen away from the elastic member; when the cleaning module cleans the screen, the electromagnet is energized and produces a repulsive effect with the permanent magnet.

[0021] Preferably, the detection module further includes:

[0022] A cleaning feedback unit, used to obtain a real-time pressure value detected by the pressure sensor when executing the first cleaning mode;

[0023] The second judgment unit is used to judge whether the real-time pressure value meets the set pressure change law. If so, the screen is cleaned. If not, when the real-time pressure value reaches the set limit value, the control module re-executes the first cleaning mode;

[0024] The cleaning feedback unit stops cleaning and feeds back to the control module when the real-time pressure value still does not meet the set pressure change rule after the first cleaning mode is executed for a set number of times.

[0025] Preferably, the grinding cylinder is also provided with a return port and a discharge port, the return port is arranged on the side of the screen close to the feed port, the discharge port is arranged on the side of the screen away from the feed port, and the feed port and the return port are connected through a return pipe.

[0026] A sand mill adopts the cleaning system for the sand mill of the present invention.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] The cleaning system for a sand mill and the sand mill described in the present invention can detect the blockage of the screen in real time during the grinding process through the detection module. When blockage occurs, the cleaning module can be controlled by the control module to clean the screen immediately, thereby eliminating the need to reduce the feed flow rate and allowing the sand mill to be cleaned while it is working without stopping the machine, thereby ensuring grinding efficiency.

[0029] The cleaning system for a sand grinder and the sand grinder described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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:

[0031] Figure 1 It is a structural schematic diagram of the cleaning system for a sand mill according to the present invention when the cleaning module is not working;

[0032] Figure 2 It is a schematic diagram of the installation structure of the screen in the cleaning system for the sand mill according to the present invention;

[0033] Figure 3 It is a structural schematic diagram of the cleaning system for a sand mill according to the present invention when the cleaning module is working;

[0034] Figure 4 It is a schematic diagram of the three-dimensional structure of the cleaning module and the screen in the grinding cylinder in the cleaning system for the sand mill according to the present invention;

[0035] Figure 5 It is a schematic diagram of the corresponding structures of the sieve hole and the cleaning part in the cleaning system for the sand mill according to the present invention;

[0036] Figure 6 It is a structural schematic diagram of the cleaning system for a sand mill according to the present invention when the cleaning part encounters solid materials blocking the sieve hole during cleaning;

[0037] Figure 7 The present invention is a schematic structural diagram of a cleaning system for a sand mill in which a cleaning part is inserted into a sieve hole during cleaning. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] like Figure 1 As shown, the present invention provides a cleaning system for a sand mill, comprising:

[0041] The detection module is used to detect in real time whether the screen 2 in the grinding cylinder 1 is blocked when the grinding machine is working, and output the detection result;

[0042] A cleaning module, used to clean the screen 2 when the screen 2 is clogged;

[0043] The control module controls the cleaning module to execute the first cleaning mode when the grinding machine is working.

[0044] The first cleaning mode is a cleaning mode that can be performed on the screen 2 when the grinding machine is working and does not need to be stopped.

[0045] When the grinder is working, after the slurry is ground in the grinding cylinder 1, the solid materials in the slurry are refined and qualified and can pass through the screen 2. Some solid materials may block the screen 2. When the blockage of the screen 2 affects the discharge of the slurry, the discharge amount per unit time will be reduced under the condition that the feed flow rate remains unchanged, which will cause the pressure in the grinding cylinder 1 to be too high. When the pressure is too high, the slurry may invade the bearing of the main shaft (the main shaft connected to the sand grinding disc 16) and cause bearing wear, or damage the feed pump 15, so it is necessary to reduce the feed flow rate accordingly, or clean the screen 2 when the machine is stopped, but this will undoubtedly affect the grinding efficiency; therefore, the detection module can detect the blockage of the screen 2 in real time during the grinding process. When blockage occurs, the cleaning module can be controlled by the control module to clean the screen 2 immediately, so that there is no need to reduce the feed flow rate, and it can be cleaned when the sand mill is working, and there is no need to stop the machine to ensure the grinding efficiency.

[0046] In one embodiment, the control module is further used to control the cleaning module to execute the second cleaning mode after the grinding machine stops working.

[0047] The second cleaning mode is a cleaning mode that requires the grinding machine to be stopped and executed on the screen 2.

[0048] like Figure 2 and Figure 4 As shown, in one embodiment, the detection module includes:

[0049] A pressure sensor, used to detect whether the screen 2 is blocked;

[0050] Among them, the grinding cylinder 1 is provided with an annular groove 3 for the movement of the screen 2, and the side of the annular groove 3 away from the feed port 9 of the grinding cylinder 1 is connected to the screen 2 through an elastic member 4, and the pressure sensor is arranged on the side where the screen 2 is connected to the elastic member 4, or on the side where the annular groove 3 is connected to the elastic member 4.

[0051] The outer ring surface of the screen 2 and the annular groove 3 are sealed and slidable, and the ground slurry will not flow out from between the two. A plurality of elastic members 4 are evenly arranged along the circumference, which can provide a balanced support force for the movement of the screen 2. When the screen 2 is not subjected to external force, under the action of the elastic member 4, the screen 2 will abut against the side of the annular groove 3 close to the feed port 9;

[0052] The screen 2 can slide elastically in the annular groove 3. When the screen 2 moves to the side away from the feed port 9, the elastic member 4 is compressed. At this time, the pressure sensor can detect the pressure value. The greater the distance the screen 2 moves to the side away from the feed port 9, the greater the pressure value detected by the pressure sensor.

[0053] Furthermore, the detection module also includes:

[0054] A feed flow acquisition unit, used to acquire the feed flow of the slurry entering the grinding cylinder 1;

[0055] The first judgment unit is used to judge whether the difference between the current pressure value detected by the pressure sensor and the set pressure value corresponding to the current feed flow rate is within a set error range. If so, the detection result is that the screen 2 is not blocked; if not, the detection result is that the screen 2 is blocked.

[0056] The current pressure value detected by the pressure sensor is the force acting on the screen 2 .

[0057] When the screen 2 is not blocked, the difference between the current pressure value detected by the pressure sensor and the set pressure value corresponding to the current feed flow rate is within the set error range;

[0058] When the screen 2 is clogged, the difference between the current pressure value detected by the pressure sensor and the set pressure value corresponding to the current feed flow rate will exceed the set error range. This is because when the feed flow rate is the same, the pressure in the grinding cylinder 1 when blockage occurs will be greater than the pressure in the grinding cylinder 1 when no blockage occurs, so the force acting on the screen 2 will increase. The pressure value detected by the pressure sensor can reflect the blockage condition of the screen 2 and make an accurate judgment on whether it is blocked.

[0059] like Figure 4 and Figure 5 As shown, in one embodiment, the cleaning module includes: a support plate 5, which is arranged on a side of the screen 2 away from the feed port 9 of the grinding cylinder 1, and a cleaning portion 6 is provided on a side of the support plate 5 close to the screen 2, and the cleaning portion 6 corresponds to the screen hole 7 of the screen 2; a driving portion, which is used to drive the support plate 5 to move along the axial direction of the grinding cylinder 1;

[0060] The first cleaning mode is to clean the sieve 2 by inserting the cleaning part 6 into the sieve hole 7 accordingly.

[0061] When the first cleaning mode needs to be executed on the screen 2, the grinder does not need to be stopped. The driving part works to drive the support plate 5 and the cleaning part 6 to move toward the side close to the screen 2, so that the cleaning part 6 is inserted into the screen hole 7 of the screen 2 to clean the solid material blocked in the screen hole 7.

[0062] In one embodiment, the cleaning module further comprises: a nozzle disposed on the support plate 5, the nozzle being used to provide a cleaning medium to the screen 2;

[0063] The second cleaning mode is as follows: a cleaning medium is provided to the screen 2 through a nozzle to clean the screen 2; the cleaning medium is gas or liquid.

[0064] When the second cleaning mode needs to be executed on the screen 2, the grinder needs to be stopped, and the cleaning medium is high-pressure gas or liquid, and the liquid is preferably a solvent and water. Specifically, a solvent that can dissolve the slurry attached to the screen 2 is first sprayed onto the screen 2, and then clean water is sprayed onto the screen 2 for cleaning.

[0065] like Figure 2 As shown, in one embodiment, an electromagnet 8 is provided on the side of the annular groove 3 close to the feed port 9, and a permanent magnet is provided on the side of the screen 2 away from the elastic member 4; when the cleaning module cleans the screen 2, the electromagnet 8 is energized and produces a repulsive effect with the permanent magnet.

[0066] In order to detect the cleaning module during cleaning so as to know the cleaning effect, an electromagnet 8 and a permanent magnet are provided.

[0067] The electromagnet 8 and the permanent magnet are applied in the following manner:

[0068] When the grinding machine is working normally, the electromagnet 8 does not work, that is, it does not exert force on the permanent magnet; when the screen 2 needs to be cleaned, before cleaning, the electromagnet 8 is energized to produce a repulsive effect on the permanent magnet, which will drive the screen 2 to move to the side away from the electromagnet 8, compressing the elastic member 4, and the pressure sensor will detect the pressure value of the screen 2 moving into place; then the cleaning module starts cleaning again;

[0069] like Figure 3 As shown, when the first cleaning mode is executed, when the support plate 5 and the cleaning part 6 move toward the side close to the screen 2 until they are in contact with the screen 2, the pressure value detected by the pressure sensor has not changed; when the cleaning part 6 is inserted into the screen hole 7 and encounters a solid material blocking it, as shown in FIG. Figure 6 As shown, the cleaning part 6 will form a force on the screen 2. Under the combined effect of this force and the elastic force of the elastic member 4, the force between the electromagnet 8 and the permanent magnet can be overcome to push the screen 2 to move. At this time, the pressure value detected by the pressure sensor will decrease. When the cleaning part 6 cleans the solid material in the screen hole 7, as shown in FIG. Figure 7 As shown, the force of the cleaning part 6 on the screen 2 disappears, and under the repulsive force generated by the electromagnet 8 and the permanent magnet, the screen 2 moves away from the electromagnet 8, and the pressure value detected by the pressure sensor returns to the pressure value when the screen 2 moves into place; therefore, the cleaning effect of the screen 2 can be known by the change of the pressure value detected by the pressure sensor.

[0070] After executing the second cleaning mode, the above-mentioned method can also be used to detect the cleaning effect of the screen 2; that is, after executing the second cleaning mode, the electromagnet 8 is energized to produce a repulsive effect on the permanent magnet, which will drive the screen 2 to move to the side away from the electromagnet 8, compress the elastic member 4, and the pressure sensor will detect the pressure value when the screen 2 moves into place; then, the cleaning part 6 is moved to the side close to the screen 2, and the cleaning effect of the screen 2 can be known by the change in the pressure value detected by the pressure sensor.

[0071] In one embodiment, the detection module further includes:

[0072] A cleaning feedback unit, used to obtain a real-time pressure value detected by the pressure sensor when executing the first cleaning mode;

[0073] The second judgment unit is used to judge whether the real-time pressure value meets the set pressure change law. If so, the cleaning of the screen 2 is completed. If not, when the real-time pressure value reaches the set limit value, the first cleaning mode is re-executed through the control module;

[0074] The cleaning feedback unit stops cleaning and feeds back to the control module when the real-time pressure value still does not meet the set pressure change rule after the first cleaning mode is executed for a set number of times.

[0075] The set pressure change rule includes: the real-time pressure value decreases from the initial pressure value and then returns to the initial pressure value; or the real-time pressure value is maintained at the initial pressure value; the initial pressure value is the pressure value mentioned in the above embodiment when the electromagnet 8 produces a repulsive effect on the permanent magnet and the pressure sensor detects that the screen 2 moves into place;

[0076] The set limit value is: the pressure value detected by the pressure sensor when the screen 2 moves to the side close to the electromagnet 8 to the set distance during cleaning; the set distance is the axial distance between the permanent magnet on the screen 2 and the electromagnet 8 when they are not in contact; that is, at the set distance, the force borne by the screen 2 is its limit value. After exceeding its limit bearing force, the screen 2 is at risk of deformation.

[0077] When executing the first cleaning mode, the cleaning effect can be known through the real-time pressure value detected by the pressure sensor, so that the control module can control the cleaning module; after the first cleaning mode is executed a set number of times, it indicates that it is difficult to achieve thorough cleaning through the first cleaning mode, and cleaning should be stopped. At this time, it is necessary to shut down after completing the grinding and use the second cleaning mode for cleaning to improve the grinding efficiency of the grinder.

[0078] like Figure 1 As shown, in one embodiment, the grinding cylinder 1 is also provided with a return port 10 and a discharge port 11. The return port 10 is arranged on the side of the screen 2 close to the feed port 9, and the discharge port 11 is arranged on the side of the screen 2 away from the feed port 9. The feed port 9 and the return port 10 are connected through a return pipe 13.

[0079] Furthermore, the feed port 9 is connected to the slurry to be processed through the feed pipe 14, the return pipe 13 is connected to the feed pipe 14, a first valve is provided on the feed pipe 14, a second valve is provided at the return port 10, and a third valve is provided at the discharge port 11; a feed pump 15 is provided at one end of the feed pipe 14 close to the feed port 9, and the slurry is transported into the grinding cylinder 1 through the feed pump 15;

[0080] When the cleaning module executes the first cleaning mode, the first valve on the feed pipe 14 is closed, the second valve of the return port 10 is fully opened, and the third valve of the discharge port 11 is opened or closed; during cleaning, the solid materials blocked on the screen 2 will be cleaned into the grinding cylinder 1, and then the slurry can be made to pass from the return port 10 through the return pipe 13 through the feed pump 15, and enter the feed port 9 of the grinding cylinder 1 again for re-grinding, and the discharge port 11 can be opened or closed at this time;

[0081] After the cleaning module executes the first cleaning mode, the first valve on the feed pipe 14 is in an open state (the first valve is set to an opening, which is related to the feed flow rate), the second valve of the return port 10 is in an open state (the second valve is set to an opening, and the solid material that has not passed through the screen 2 can be re-ground during normal grinding) or closed, and the third valve of the discharge port 11 is in an open state.

[0082] Furthermore, the grinding cylinder 1 is provided with a cleaning outlet 12, and the cleaning outlet 12 is provided with a fourth valve, and the fourth valve is in an open state only when the second cleaning mode is executed.

[0083] When the second cleaning mode is executed, the cleaning outlet 12 is in an open state, and the cleaned waste liquid is discharged from the cleaning outlet 12 .

[0084] A sand mill adopts the cleaning system for the sand mill of the present invention.

[0085] It includes: a sanding disc 16 arranged in the grinding cylinder 1, the sanding disc 16 is driven to rotate by a main shaft, the main shaft is rotatably arranged in the grinding cylinder 1, and the rotation of the main shaft is controlled by a driving mechanism.

[0086] The sand mill of the present invention is provided with a cleaning system, which can detect the blockage of the screen 2 in real time and clean it in time when the sand mill is working, so as to improve the grinding efficiency.

[0087] 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0088] 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.

[0089] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. 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 claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A cleaning system for a sand mill, characterized in that: include: A detection module, used for detecting in real time whether a screen (2) located in a grinding cylinder (1) is blocked when the grinding machine is working, and outputting the detection result; A cleaning module, used for cleaning the screen (2) when the screen (2) is clogged; The control module controls the cleaning module to execute the first cleaning mode when the grinding machine is working.

2. The cleaning system for a sand mill according to claim 1, characterized in that: The control module is also used to control the cleaning module to execute a second cleaning mode after the grinding machine stops working.

3. The cleaning system for a sand mill according to claim 1, characterized in that: The detection module comprises: A pressure sensor, used to detect whether the screen (2) is blocked; The grinding cylinder (1) is provided with an annular groove (3) for the mesh screen (2) to move, and the side of the annular groove (3) away from the feed port (9) of the grinding cylinder (1) is connected to the mesh screen (2) via an elastic member (4), and the pressure sensor is arranged on the side where the mesh screen (2) is connected to the elastic member (4), or on the side where the annular groove (3) is connected to the elastic member (4).

4. The cleaning system for a sand mill according to claim 3, characterized in that: The detection module also includes: A feed flow acquisition unit, used to acquire the feed flow of the slurry entering the grinding cylinder (1); The first judgment unit is used to judge whether the difference between the current pressure value detected by the pressure sensor and the set pressure value corresponding to the current feed flow rate is within a set error range. If so, the detection result is that the screen (2) is not blocked; if not, the detection result is that the screen (2) is blocked.

5. The cleaning system for a sand mill according to claim 2, characterized in that: The cleaning module comprises: a support plate (5) arranged on a side of the screen (2) away from a feed inlet (9) of the grinding cylinder (1); a cleaning portion (6) is arranged on a side of the support plate (5) close to the screen (2), and the cleaning portion (6) corresponds to a screen hole (7) of the screen (2); and a driving portion for driving the support plate (5) to move along the axial direction of the grinding cylinder (1); The first cleaning mode is to clean the sieve (2) by inserting the cleaning part (6) into the sieve hole (7) accordingly.

6. The cleaning system for a sand mill according to claim 5, characterized in that: The cleaning module further comprises: a nozzle arranged on the support plate (5), the nozzle being used to provide a cleaning medium to the screen (2); The second cleaning mode is as follows: a cleaning medium is provided to the screen (2) through a nozzle to clean the screen (2); the cleaning medium is gas or liquid.

7. The cleaning system for a sand mill according to claim 3, characterized in that: An electromagnet (8) is provided on the side of the annular groove (3) close to the feed port (9), and a permanent magnet is provided on the side of the screen (2) away from the elastic member (4); when the cleaning module cleans the screen (2), the electromagnet (8) is energized and produces a repulsive effect with the permanent magnet.

8. The cleaning system for a sand mill according to claim 7, characterized in that: The detection module also includes: A cleaning feedback unit, used to obtain a real-time pressure value detected by the pressure sensor when executing the first cleaning mode; A second judgment unit is used to judge whether the real-time pressure value satisfies the set pressure variation law. If so, the screen (2) is cleaned. If not, when the real-time pressure value reaches the set limit value, the control module re-executes the first cleaning mode; The cleaning feedback unit stops cleaning and feeds back to the control module when the real-time pressure value still does not meet the set pressure change rule after the first cleaning mode is executed for a set number of times.

9. The cleaning system for a sand mill according to claim 5, characterized in that: The grinding cylinder (1) is also provided with a return port (10) and a discharge port (11); the return port (10) is arranged on a side of the screen (2) close to the feed port (9), and the discharge port (11) is arranged on a side of the screen (2) away from the feed port (9); the feed port (9) and the return port (10) are connected via a return pipe (13).

10. A sand mill, characterized in that: A cleaning system for a sand mill according to any one of claims 1 to 9 is used.

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