A cyclic sanding device and its control method

Abstract

The present invention is applicable to the technical field of sand mills, and provides a circulating sand grinding device and a control method thereof, including a horizontal grinding barrel, a rotary grinding unit, a screen, a material barrel, a pump, a material pipe, a valve, a pressure monitoring unit, and a control unit. The rotary grinding unit and the screen are arranged in the horizontal grinding barrel and are used for grinding and separating materials. The material barrel and the pump are connected to the horizontal grinding barrel through the material pipe. The pressure detection unit judges the blockage condition of the screen by detecting the pressures at both ends of the horizontal grinding barrel, controls the flow direction of the material through the valve, and thereby cleans the screen, avoiding problems caused by blockage of the screen of the sand mill, and ensuring the grinding efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand mills, and particularly relates to a circulating sand grinding device and a control method thereof. Background Art

[0002] During the working process of a sand mill, the sieve mesh often gets blocked to varying degrees, which affects the working efficiency of the sand mill. Some serious sieve mesh blockages can also damage the mechanical structure of the sand mill. And the sieve mesh is usually arranged inside the sand mill, making it very difficult to disassemble and clean, and the act of disassembling the sand mill itself is also likely to damage the mechanical structure of the sand mill. Therefore, it is very important to solve the problem of sieve mesh blockage of the sand mill.

[0003] There are mainly two types of methods on the market to solve the problem of sieve mesh blockage of sand mills. The first is to prevent blockage by vibrating the sieve mesh. For example, a grinding machine for producing red phosphorus flame retardant with anti-blocking function disclosed in the Chinese Patent Database (Application No.: CN202122210472.8; Authorization Publication No.: CN216025206U). Its main working principle is to cause vibration of the sand grinding sieve plate by the up-and-down displacement of the sand grinding sieve plate in cooperation with the collision of the dynamic frame, so as to shake out the jamming and blockage in the pores of the sand grinding sieve plate, realizing self-cleaning of the sand grinding sieve plate. This anti-blocking design will cause certain damage to the sieve mesh itself. Although it reduces the degree of sieve mesh blockage, it also reduces the service life of the sieve mesh. The second is to clean and prevent blockage of the sieve mesh by a scraper. For example, an anti-blocking structure of a sand mill disclosed in the Chinese Patent Database (Application No.: CN202122972821.X; Authorization Publication No.: CN216419618U). It includes a filter box, a baffle, a filter plate, a chute, a threaded rod, a scraper, a first motor, a discharge pipe, a collection box and a collection tank. Its main working principle is to scrape off the coarse particles attached to the surface of the sieve mesh by setting a reciprocating scraper. However, this design may also make the coarse particles stuck more firmly while scraping off the coarse particles, and cannot completely solve the problem of sieve mesh blockage.

[0004] Therefore, in view of the above problems, a circulating sand grinding device and a control method thereof are designed. Summary of the Invention

[0005] The present invention provides a circulating sand grinding device and a control method thereof, which can effectively solve the above problems.

[0006] The present invention is implemented as follows:

[0007] A circulating sand grinding device includes a sand mill and a circulation system.

[0008] The sand mill includes: a horizontal grinding barrel, which includes a cylindrical grinding barrel body. A grinding side feed pipe and a screen side feed pipe are provided on the grinding barrel body. The grinding side feed pipe is arranged on the side of one end of the horizontal grinding barrel, and the screen side feed pipe is arranged at the center of the other end of the horizontal grinding barrel; a rotating grinding unit, which is fixed in the horizontal grinding barrel and includes a bearing seat and a rotating shaft with a dispersion disc fixed on the bearing seat. A cylindrical groove is provided at one end of the rotating shaft away from the bearing seat, and the groove faces the screen side feed pipe; a screen, which is arranged between the screen side feed pipe and the groove. Arranging the screen inside the rotating shaft can save space and enable the rotating shaft to stir the materials around the screen to prevent blockage.

[0009] The circulation system includes: a material barrel, which includes a material barrel body, a first inlet / outlet and a second inlet / outlet provided on the material barrel body; a circulation pump; a material pipe, which includes a first material pipe connected to the circulation pump and the first inlet / outlet, a second material pipe connected to the circulation pump and the grinding side feed pipe, a third material pipe connected to the circulation pump and the screen side feed pipe, and a fourth material pipe connected to the second inlet / outlet, the grinding side feed pipe and the screen side feed pipe; valves, which include a first valve provided on the second material pipe, a second valve provided on the third material pipe, a third valve provided on the grinding side feed pipe between the second material pipe and the fourth material pipe, and a fourth valve provided on the screen side feed pipe between the third material pipe and the fourth material pipe; a pressure monitoring unit, which includes a first pressure gauge for monitoring the pressure in the grinding side feed pipe and a second pressure gauge for monitoring the pressure in the screen side feed pipe; a control unit, which is respectively connected to the circulation pump, the sand mill, the valves and the pressure detection unit.

[0010] As another improvement of the present invention, the material barrel further includes a stirring rod, which has the function of stirring the materials in the material barrel.

[0011] A control method for a circulating sand grinding device includes the following steps:

[0012] S1. Start the sand mill and the circulation system to start working. Among them, the circulation system works in a cycle according to the first working mode and the second working mode. In the first working mode, keep the first valve and the fourth valve open, keep the second valve and the third valve closed, and make the material flow direction flow from the grinding side material pipe to the screen side material pipe. At this time, the material passes through the screen from the side of the screen close to the grinding side material pipe, and plays an anti-washing role on the side of the screen close to the screen side material pipe; in the second working mode, keep the second valve and the third valve open, keep the first valve and the fourth valve closed, and make the material flow direction flow from the screen side material pipe to the grinding side material pipe. At this time, the material passes through the screen from the side of the screen close to the screen side material pipe, and plays an anti-washing role on the side of the screen close to the grinding side material pipe.

[0013] A control method for a circulating sand mill device, the circulating sand mill device is used for grinding lithium iron phosphate slurry, and it includes the following steps:

[0014] S1. Start the sand mill and the circulation system to start working. Among them, the circulation system works in a cycle according to the first working mode and the second working mode. In the first working mode, keep the first valve and the fourth valve open, keep the second valve and the third valve closed, and make the material flow direction flow from the grinding side material pipe to the screen side material pipe. At this time, the material passes through the screen from the side of the screen close to the grinding side material pipe, and plays an anti-washing role on the side of the screen close to the screen side material pipe; in the second working mode, keep the second valve and the third valve open, keep the first valve and the fourth valve closed, and make the material flow direction flow from the screen side material pipe to the grinding side material pipe. At this time, the material passes through the screen from the side of the screen close to the screen side material pipe, and plays an anti-washing role on the side of the screen close to the grinding side material pipe.

[0015] The beneficial effects of the present invention are: The circulating sand mill device and its control method provided by the present invention can prevent the clogging of the screen by abrasive particles during the grinding process by setting forward and reverse flow channels in the circulation system and setting forward and reverse working modes, improving the working efficiency of the sand mill and extending the service life of the sand mill. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0017] Figure 1 It is the schematic diagram of the first working mode provided by the embodiment of the present invention;

[0018] Figure 2 It is the schematic diagram of the second working mode provided by the embodiment of the present invention;

[0019] Figure 3 It is the structure diagram of the sand mill provided by the embodiment of the present invention.

[0020] Reference numerals:

[0021] 1 - sand mill; 10 - horizontal grinding barrel; 100 - grinding barrel body; 101 - grinding side material pipe; 102 - screen side material pipe; 11 - rotating grinding unit; 110 - bearing seat; 111 - rotating shaft; 112 - groove; 12 - screen; 2 - circulation system; 20 - material barrel; 200 - material barrel body; 201 - first inlet and outlet; 202 - second inlet and outlet; 203 - stirring rod; 21 - circulation pump; 22 - material pipe; 221 - first material pipe; 222 - second material pipe; 223 - third material pipe; 224 - fourth material pipe; 23 - valve; 231 - first valve; 232 - second valve; 233 - third valve; 234 - fourth valve; 24 - pressure monitoring unit; 241 - first pressure gauge; 242 - second pressure gauge. Detailed embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0024] In the description of the present invention, the term "forward" refers to the direction in which the material flows from the grinding-side feed pipe to the screen-side feed pipe; the term "reverse" refers to the direction in which the material flows from the screen-side feed pipe to the grinding-side feed pipe; the term "front side" refers to the side of the screen away from its rotation center; the term "back side" refers to the side of the screen close to its rotation center.

[0025] Refer to Figure 1 As shown, an embodiment of the present invention provides a circulating sand grinding device, including a sand mill 1 and a circulating system 2.

[0026] The sand mill 1 includes: a horizontal grinding barrel 10, which includes a cylindrical grinding barrel body 100, and a grinding-side feed pipe 101 and a screen-side feed pipe 102 are provided on the grinding barrel body 100. The grinding-side feed pipe 101 is arranged on the side surface of one end of the horizontal grinding barrel 10, and the screen-side feed pipe 102 is arranged at the center of the other end of the horizontal grinding barrel 10; a rotating grinding unit 11, which is fixed in the horizontal grinding barrel 10 and includes a bearing seat 110 and a rotating shaft 111 with a dispersion disc fixed on the bearing seat 110. A cylindrical groove 112 is provided at one end of the rotating shaft 111 away from the bearing seat 110, and the groove 112 is directly opposite to the screen-side feed pipe 102; a screen 12, which is arranged between the screen-side feed pipe 102 and the groove 112. The sand mill 1 of the present invention may be other existing types of grinding machines, and no limitation is made here. The sand mill 1 of the present invention is mainly used for circulating grinding of the slurry of lithium iron phosphate. The mesh size of the screen 12 can be selected according to actual needs and can be specifications such as 0.15 mm, 0.2 mm, 0.3 mm, etc.

[0027] The circulation system 2 includes: a material barrel 20, which includes a material barrel body 200, a first inlet / outlet 201 and a second inlet / outlet 202 provided on the material barrel body 200; a circulation pump 21; a material pipe 22, which includes a first material pipe 221 connected to the circulation pump 21 and the first inlet / outlet 201, a second material pipe 222 connected to the circulation pump 21 and the grinding-side material pipe 101, a third material pipe 223 connected to the circulation pump 21 and the screen-side material pipe 102, and a fourth material pipe 224 connected to the second inlet / outlet 202, the grinding-side material pipe 101, and the screen-side material pipe 102; valves 23, which include a first valve 231 provided on the second material pipe 222, a second valve 232 provided on the third material pipe 223, a third valve 233 provided on the grinding-side material pipe 101 between the second material pipe 222 and the fourth material pipe 224, and a fourth valve 234 provided on the screen-side material pipe 102 between the third material pipe 223 and the fourth material pipe 224; a pressure monitoring unit 24, which includes a first pressure gauge 241 for monitoring the pressure in the grinding-side material pipe 101 and a second pressure gauge 242 for monitoring the pressure in the screen-side material pipe 102; and a control unit, which is respectively connected to the circulation pump 21, the sand mill 1, the valves 23, and the pressure detection unit 24.

[0028] In actual product applications, those skilled in the art can set or select a control mechanism, such as a circuit board, a controller, or a control chip, according to the action requirements of the above mechanisms, and connect each mechanism to a power source. This belongs to the prior art and will not be elaborated here one by one.

[0029] The embodiment of the present invention further provides a control method for a circulating sanding device, which includes the following steps:

[0030] S1, start the sand mill and the circulation system to start working, wherein the circulation system works in a cycle according to a first working mode and a second working mode.

[0031] Refer to Figure 2 As shown, in the first working mode, keep the first valve 231 and the fourth valve 234 open, and keep the second valve 232 and the third valve 233 closed. At this time, the flow path of the material is: the first inlet / outlet 201, the first material pipe 221, the circulation pump 21, the second material pipe 222, the grinding-side material pipe 101, the grinding barrel body 100, the screen 12, the screen-side material pipe 102, the fourth material pipe 224, the second inlet / outlet 202. When the material passes through the screen 12 in the forward direction, it is equivalent to backwashing the reverse side of the screen 12.

[0032] Refer to Figure 3As shown, in the second working mode, the second valve 232 and the third valve 233 are kept open, and the first valve 231 and the fourth valve 234 are kept closed. At this time, the flow path of the material is: the first inlet / outlet 201, the first material pipe 221, the circulation pump 21, the third material pipe 223, the screen side material pipe 102, the grinding barrel body 100, the screen 12, the grinding side material pipe 101, the fourth material pipe 224, the second inlet / outlet 202. When the material passes through the screen 12 in the reverse direction, it is equivalent to backwashing the front side of the screen 12. It can be understood that by swapping the forward and reverse directions, both sides of the screen 12 can be flushed in different directions during use, reducing the problem that one side of the screen 12 is prone to clogging when continuously used in the same direction.

[0033] As a further improvement, in the first working mode, it can further include:

[0034] S2. Obtain the pressure of the grinding side material pipe through the first pressure gauge 241. When the pressure exceeds the set value of the first pressure gauge 241, switch to the second working mode. This is because during the actual operation, the pressure of the first pressure gauge 241 should be within a stable predetermined range. Only when the screen 12 is blocked will the pressure of the first pressure gauge 241 change to a certain extent. Therefore, in the present invention, when the pressure exceeds the set value of the first pressure gauge 241, it is judged that there may be a blockage, and at this time, it is switched to the second working mode, that is, reverse dredging is carried out without affecting the actual work.

[0035] As a further improvement, after step S2, it can further include:

[0036] S21. When switching to the second working mode, obtain the pressure of the screen side material pipe 102 through the second pressure gauge 242, and judge whether the pressure of the screen side material pipe 102 drops to the normal threshold value within a unit time. If so, it means that it has been dredged; otherwise, it means that it has not been dredged and enter S22. It can be understood that the advantage of such a setting is that it is possible to judge whether the screen 12 has been dredged without using other additional sensors. If it has been dredged, continue to execute the second working mode until the next switch.

[0037] As a further improvement, after step S21, it can further include:

[0038] S22. Keep the second working mode, increase the power of the circulation pump 21 for a predetermined dredging time, and judge whether the pressure of the screen side material pipe 102 drops to the normal threshold value within a unit time. If so, it means that it has been dredged; otherwise, stop the machine for processing. The advantage of this is that through high-power reverse flushing, it is relatively easy to wash down the substances staying on the back side of the screen 12.

[0039] As a further improvement, in the second working mode, it may further include:

[0040] S3. In the second working mode, obtain the pressure of the screen side material pipe 102 through the second pressure gauge 242. When the pressure exceeds the set value of the second pressure gauge 242, switch to the first working mode.

[0041] As a further improvement, after step S3, it may further include:

[0042] S31. When switching to the first working mode, obtain the pressure of the grinding side material pipe 101 through the first pressure gauge 241, and determine whether the pressure of the grinding side material pipe 101 drops to the normal threshold within a unit time. If so, it means it has been dredged; otherwise, it means it has not been dredged and enter S32.

[0043] As a further improvement, after step S31, it may further include:

[0044] S32. Keep the first working mode, increase the power of the circulation pump 21 for a predetermined dredging time, and determine whether the pressure of the grinding side material pipe 101 drops to the normal threshold within a unit time. If so, it means it has been dredged; otherwise, stop the machine for processing.

[0045] The control method of the circulating sand grinding device provided by the embodiment of the present invention is particularly suitable for the grinding of lithium iron phosphate slurry. This is because, generally, abrasives need to be added during the grinding process of lithium iron phosphate slurry. Although the addition of abrasives can improve the grinding efficiency, the abrasives are easily blocked on the inner surface of the screen 12. Therefore, the two-way control can prevent the blockage of abrasives. Further, in the prior art, if it is blocked, generally, the entire sand mill 1 needs to be disassembled, and the screen 12 and abrasives need to be cleaned before it can be used again to prevent pollution; while the control of the present invention can greatly reduce the frequency and number of disassembly.

[0046] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cyclic sanding device, comprising a sand mill (1) and a circulation system (2), The sand mill (1) includes: Horizontal grinding barrel (10), which includes a cylindrical grinding barrel body (100). A grinding side material pipe (101) and a screen side material pipe (102) are provided on the grinding barrel body (100). The grinding side material pipe (101) is arranged on the side of one end of the horizontal grinding barrel (10), and the screen side material pipe (102) is arranged at the center of the other end of the horizontal grinding barrel (10); a rotary grinding unit (11), which is fixed in the horizontal grinding barrel (10), and includes a bearing seat (110) and a rotating shaft (111) with a dispersion disc fixed on the bearing seat (110). A cylindrical groove (112) is provided at one end of the rotating shaft (111) away from the bearing seat (110), and the groove (112) is directly opposite to the screen side material pipe (102); a screen (12), which is arranged between the screen side material pipe (102) and the groove (112). The circulation system (2) includes: a material barrel (20), which includes a material barrel body (200), a first inlet / outlet (201) and a second inlet / outlet (202) provided on the material barrel body (200); a circulation pump (21); a material pipe (22), which includes a first material pipe (221) connected to the circulation pump (21) and the first inlet / outlet (201), a second material pipe (222) connected to the circulation pump (21) and the grinding side material pipe (101), a third material pipe (223) connected to the circulation pump (21) and the screen side material pipe (102), and a fourth material pipe (224) connected to the second inlet / outlet (202), the grinding side material pipe (101), and the screen side material pipe (102); valves (23), which include a first valve (231) provided on the second material pipe (222), a second valve (232) provided on the third material pipe (223), a third valve (233) provided on the grinding side material pipe (101) between the second material pipe (222) and the fourth material pipe (224), and a fourth valve (234) provided on the screen side material pipe (102) between the third material pipe (223) and the fourth material pipe (224); a pressure monitoring unit (24), which includes a first pressure gauge (241) for monitoring the pressure in the grinding side material pipe (101) and a second pressure gauge (242) for monitoring the pressure in the screen side material pipe (102); a control unit, which is respectively connected to the circulation pump (21), the sand mill (1), the valves (23), and the pressure monitoring unit (24).

2. The cyclic sanding device according to claim 1, characterized in that, The material barrel (20) further includes a stirring rod (203), which has the function of stirring the materials in the material barrel (20).

3. A control method for a cyclic sanding device as claimed in claim 1, characterized in that, It includes the following steps: S1. Start the bead mill (1) and the circulation system (2) to start working. Among them, the circulation system (2) works in a cycle according to the first working mode and the second working mode. In the first working mode, keep the first valve (231) and the fourth valve (234) open, keep the second valve (232) and the third valve (233) closed, and make the material flow direction flow along the grinding side material pipe (101) to the screen side material pipe (102); in the second working mode, keep the second valve (232) and the third valve (233) open, keep the first valve (231) and the fourth valve (234) closed, and make the material flow direction flow along the screen side material pipe (102) to the grinding side material pipe (101).

4. The control method for a cyclic sanding device according to claim 3, characterized in that, Further comprising: S2. In the first working mode, obtain the pressure of the grinding side material pipe (101) through the first pressure gauge (241). When the pressure exceeds the set value of the first pressure gauge (241), switch to the second working mode.

5. The control method for a cyclic sanding device according to claim 4, characterized in that, Further comprising: S21. When switching to the second working mode, obtain the pressure of the screen side material pipe (102) through the second pressure gauge (242), and judge whether the pressure of the screen side material pipe (102) drops to the normal threshold within a unit time. If so, it means it has been dredged; otherwise, it means it has not been dredged and enter S22; S22. Keep the second working mode, increase the power of the circulation pump (21) for a predetermined dredging time, and judge whether the pressure of the screen side material pipe (102) drops to the normal threshold within a unit time. If so, it means it has been dredged; otherwise, stop the machine for processing.

6. The control method for a cyclic sanding device according to claim 3, characterized in that, Further comprising: S3. In the second working mode, obtain the pressure of the screen side material pipe (102) through the second pressure gauge (242). When the pressure exceeds the set value of the second pressure gauge (242), switch to the first working mode.

7. The control method for a cyclic sanding device according to claim 6, characterized in that, Further comprising: S31. When switching to the first working mode, obtain the pressure of the grinding side material pipe (101) through the first pressure gauge (241), and judge whether the pressure of the grinding side material pipe (101) drops to the normal threshold within a unit time. If so, it means it has been dredged; otherwise, it means it has not been dredged and enter S32; S32. Keep the first working mode, increase the power of the circulation pump (21) for a predetermined dredging time, and judge whether the pressure of the grinding side material pipe (101) drops to the normal threshold within a unit time. If so, it means it has been dredged; otherwise, stop the machine for processing.

8. A control method for a cyclic sanding device as claimed in claim 1, characterized in that, The circulating bead mill device is used for grinding lithium iron phosphate slurry, and it includes the following steps: S1. Start the bead mill (1) and the circulation system (2) to start working. Among them, the circulation system (2) operates in a cycle according to the first working mode and the second working mode. In the first working mode, keep the first valve (231) and the fourth valve (234) open, and keep the second valve (232) and the third valve (233) closed, so that the material flow direction is along the grinding side material pipe (101) to the screen side material pipe (102); in the second working mode, keep the second valve (232) and the third valve (233) open, and keep the first valve (231) and the fourth valve (234) closed, so that the material flow direction is along the screen side material pipe (102) to the grinding side material pipe (101).

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