Sanding structure for grinding water-based paint raw materials, using method and sand mill

Abstract

The invention belongs to the field of sand mills, and particularly relates to a sand milling structure for grinding water-based paint raw materials, a using method and a sand mill. The sanding structure for grinding the water-based paint raw materials comprises a grinding cylinder, a grinding rotating disc arranged in the grinding cylinder, a feeding pipe arranged on one side of the grinding cylinder and a discharging pipe arranged on the other side of the grinding cylinder, and the grinding rotating disc is of a rod pin type or turbine type structure; a plurality of jet exciters are arranged in the inner wall of the grinding cylinder, and a one-way water inlet pipe is connected to an excitation cavity of each jet exciter and used for injecting cleaning fluid into the excitation cavity in the cleaning stage. The jet flow exciter is integrated on the inner wall, in direct contact with materials, of the grinding cylinder, so that the same structure has the dual functions of actively enhancing flow field disturbance during grinding and high-pressure directional flushing during cleaning, and integration of grinding efficiency improvement and equipment self-cleaning is achieved.

Description

A sand mill structure, usage method, and sand mill for grinding water-based paint raw materials Technical Field

[0001] This invention belongs to the field of sand mills, specifically relating to a sand mill structure, usage method, and sand mill for grinding water-based paint raw materials. Background Technology

[0002] Currently, the widely used horizontal sand mills rely primarily on the high-speed rotation of the grinding disc (such as a pin-type or turbine-type structure) for grinding, directly impacting and shearing materials (e.g., water-based paint raw materials) with the grinding media through mechanical components. The structure of such equipment is typically fixed, and the fluid dynamics within the grinding chamber are entirely passively driven by the rotating components, resulting in uneven flow field distribution and a tendency to create dead zones in the agitation.

[0003] In addition, current sand mills generally suffer from the following problems: First, in the grinding stage of materials such as water-based paints, it is difficult to achieve uniform and high-intensity shearing of the flow field by simply relying on mechanical rotation, resulting in limited grinding efficiency, wide particle size distribution of the product, and difficulty in achieving the ideal nano-level dispersion effect and paint film gloss; Second, in the cleaning stage, the complex geometric structure of the grinding disc and the inner wall of the cavity (such as gaps, grooves, and angles) is difficult to clean effectively, resulting in sanitary dead corners, which can easily lead to material residue and cross-contamination. For the production of water-based paints that require frequent color changes, this can easily cause color differences and seriously affect product quality; Third, grinding and cleaning are two independent and separate processes. Cleaning requires machine shutdown and consumes a lot of time and resources, which seriously affects equipment utilization and production continuity.

[0004] Therefore, there is an urgent need in this field for an innovative sand milling structure and method that can proactively optimize the flow field within the grinding chamber to improve grinding efficiency and precision without disrupting the production process, and can achieve efficient, automated, and thorough cleaning without dead angles inside the equipment, thereby highly integrating grinding and cleaning functions and fundamentally solving the industry problem of balancing efficiency and cleanliness. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a sand mill structure, a method of use, and a sand mill for grinding water-based paint raw materials. By integrating a jet exciter into the inner wall of the grinding cylinder, which is in direct contact with the material, the same structure has the dual functions of actively enhancing flow field disturbance during grinding and high-pressure directional flushing during cleaning, thereby achieving the integration of improved grinding efficiency and equipment self-cleaning.

[0006] This invention provides a grinding structure for grinding water-based paint raw materials, including a grinding cylinder, a grinding disc disposed inside the grinding cylinder, a feed pipe disposed on one side of the grinding cylinder, and a discharge pipe disposed on the other side of the grinding cylinder. The grinding disc is constructed as a pin-type or turbine-type structure.

[0007] The grinding cylinder is provided with a number of jet exciters on its inner wall. The outlet of the jet exciter is connected to the inside of the grinding cylinder to generate a jet that enhances the grinding effect.

[0008] Each jet actuator is equipped with a one-way water inlet pipe for injecting cleaning fluid into the excitation chamber during the cleaning phase.

[0009] During the cleaning stage, the cleaning fluid can be injected into the excitation chamber through the one-way water inlet pipe, and then flow through the outlet to be sprayed into the interior of the grinding cylinder to clean the inner wall of the grinding cylinder and the grinding disc.

[0010] Furthermore, the outlet of the jet exciter protrudes from the inner wall surface of the grinding cylinder to form a flow-around structure that enhances fluid turbulence.

[0011] Furthermore, the outlet protruding from the inner wall surface of the grinding cylinder is constructed as a conical cylinder structure. The internal flow of the conical cylinder is used to converge and accelerate the jet to enhance the impact and flow effect. The outer wall surface of the conical cylinder is used to enhance the fluid flow during the grinding process and prevent material from accumulating on its surface.

[0012] Furthermore, the grinding disc is provided with a reflux recess;

[0013] When the outlet of the jet actuator is directly opposite the return concave hole, the injected cleaning fluid can be injected into the return concave hole and turned to clean the area outside the outlet.

[0014] Furthermore, the outlet of a portion of the jet exciter is configured to face a geometry on the grinding disc, the geometry including at least one of an angled region, a groove, or a slit;

[0015] During the cleaning stage, the cleaning fluid ejected from the outlet can directly impact the geometry to effectively clean the complex surface of the grinding disc.

[0016] Furthermore, several jet exciters are arranged in a circular array along the axial direction of the grinding cylinder, forming multiple columns; in each column, each jet exciter is arranged at equal intervals along the axial length direction of the grinding cylinder.

[0017] Furthermore, in each column, the unidirectional water inlet pipe of each jet exciter is connected to a branch water pipe; each branch water pipe is equipped with a control valve at its water inlet end; and all the branch water pipes are connected to a main water pipe.

[0018] Furthermore, the jet exciter is a synthetic dual-jet exciter, which is divided into two independent excitation chambers by a vibrating diaphragm; each of the excitation chambers is connected to a corresponding outlet and a one-way water inlet pipe.

[0019] The present invention also provides a sand milling method using the above-mentioned sand milling structure for grinding water-based paint raw materials, comprising the following steps:

[0020] Grinding stage:

[0021] Close the one-way water inlet pipe;

[0022] The jet exciter is controlled to operate, causing its excitation cavity to expand and contract periodically;

[0023] When the excitation chamber expands, fluid is drawn in from inside the grinding cylinder;

[0024] When the excitation chamber contracts, the fluid drawn in is ejected from the outlet in the form of a jet to improve the fluid turbulence and grinding effect inside the grinding cylinder.

[0025] Cleaning stage:

[0026] Cleaning fluid is injected unidirectionally into the excitation chamber through the one-way water inlet pipe;

[0027] The jet exciter is controlled to operate as a volumetric pump, so that the cleaning fluid flows sequentially through the excitation chamber and the outlet, and is sprayed into the interior of the grinding cylinder to clean the inner wall of the grinding cylinder and the grinding disc.

[0028] The present invention also provides a sand mill, including the above-mentioned sand mill structure for grinding water-based paint raw materials.

[0029] The beneficial effects of this invention are that the sand mill structure for grinding water-based paint raw materials provided by this invention achieves dual optimization of grinding and cleaning functions by integrating a jet exciter with dual working modes into the inner wall of the grinding cylinder. During the grinding stage, the jet exciter, as a momentum output device with zero net flow addition, actively disturbs the flow field inside the grinding chamber through a directional and continuous vector jet, significantly enhancing the uniformity of material dispersion and grinding efficiency. Specifically, in the grinding of water-based paints, this active jet can effectively break up pigment agglomerates, making the pigment distribution more uniform, thereby shortening the grinding time and improving the color performance and hiding power of the paint film. During the cleaning stage, it transforms into a high-pressure cleaning pump through a one-way water inlet pipe, enabling precise and thorough rinsing of the grinding disc and the complex structure inside the cylinder. In water-based paint production, it can achieve powerful rinsing of the interior of the chamber, especially in hard-to-reach areas where pigments are prone to residue, greatly reducing the risk of contamination during color changes and ensuring color consistency between batches. This structure not only improves grinding precision and production capacity, but also effectively solves the problems of incomplete cleaning and long downtime in traditional equipment. Thus, while ensuring consistent product quality, it improves the overall efficiency and automation level of the equipment. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the structure of the sand mill for grinding water-based paint raw materials in this invention;

[0031] Figure 2 is a front view of the sand mill structure for grinding water-based paint raw materials in this invention;

[0032] Figure 3 is a cross-sectional view along direction AA in Figure 2;

[0033] Figure 4 is a magnified view of part B in Figure 3;

[0034] Figure 5 is a schematic diagram of the structure of the sand mill in this invention.

[0035] In the diagram, 1 is the grinding cylinder; 2 is the grinding disc; 21 is the reflux concave hole; 3 is the feed pipe; 4 is the discharge pipe; 5 is the jet exciter; 51 is the outlet; 52 is the excitation chamber; 53 is the vibrating diaphragm; 54 is the one-way water inlet pipe; 55 is the branch water pipe; 56 is the control valve; and 57 is the main water pipe. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0041] As shown in Figures 1-4, the present invention provides a sand mill structure for grinding water-based paint raw materials, including a grinding cylinder 1, a grinding disc 2 disposed inside the grinding cylinder 1, a feed pipe 3 disposed on one side of the grinding cylinder 1, and a discharge pipe 4 disposed on the other side of the grinding cylinder 1. The grinding disc 2 is constructed as a pin-type or turbine-type structure. The grinding disc 2 shears and disperses the material by high-speed rotation, or promotes the shearing of the grinding media and the material by high-speed rotation.

[0042] The grinding cylinder 1 is equipped with several jet exciters 5 inside its inner wall. The jet exciters 5 introduce an active fluid disturbance source. The outlet 51 of the jet exciters 5 is connected to the inside of the grinding cylinder 1 to generate a jet that enhances the grinding effect. This jet can effectively break the laminar flow in the grinding area, increase the collision probability and shear force between the material and the grinding medium. During the grinding stage, no net fluid is added to the system of the jet exciters 5 and the grinding cylinder 1 (the mass of the fluid drawn in and the fluid ejected are equal), but it still outputs momentum into the grinding cylinder 1, thereby producing a continuous and directional jet effect.

[0043] Each jet actuator 5 has a one-way water inlet pipe 54 connected to its excitation chamber 52, which is used to inject cleaning fluid into the excitation chamber 52 during the cleaning stage. The one-way water inlet pipe 54 is used to inject cleaning fluid into the excitation chamber 52 during the cleaning stage, providing an independent cleaning fluid passage for the jet actuator 5, so as to clean the inside of the grinding cylinder 1 after the self-cleaning of the internal structure of the jet actuator 5.

[0044] During the cleaning stage, the cleaning fluid can be injected into the excitation chamber 52 through the one-way water inlet pipe 54, and then flow through the outlet 51 to be sprayed into the interior of the grinding cylinder 1 to clean the inner wall of the grinding cylinder and the grinding disc 2. During the cleaning stage, the jet exciter 5 is transformed into a cleaning fluid injection pump. By utilizing the specific position and direction of its outlet 51, it can achieve directional and high-pressure rinsing of the complex internal structure of the grinding cylinder 1, especially the surface and gaps of the grinding disc 2.

[0045] The sand mill structure for grinding water-based paint raw materials provided by this invention achieves dual optimization of grinding and cleaning functions by integrating a jet exciter 5 with dual working modes into the inner wall of the grinding cylinder 1. During the grinding stage, the jet exciter 5 acts as a momentum output device with zero net flow addition, actively disturbing the flow field within the grinding chamber 1 through a directional and continuous vector jet, significantly enhancing the uniformity of material dispersion and grinding efficiency. During the cleaning stage, it transforms into a high-pressure cleaning pump via a one-way water inlet pipe 54, enabling precise and thorough rinsing of the grinding disc 2 and the complex structure inside the cylinder. This structure not only improves grinding accuracy and production capacity but also effectively solves the problems of incomplete cleaning and long downtime in traditional equipment, thereby improving the overall efficiency and automation level of the equipment while ensuring consistent product quality.

[0046] In one embodiment, the outlet 51 of the jet exciter 5 protrudes from the inner wall surface of the grinding cylinder 1 to form a flow-around structure that enhances fluid disturbance.

[0047] In this embodiment, during the grinding stage, when the high-speed flowing material and grinding media flow through the externally protruding outlet 51, their flow path is forcibly changed and they flow around the material, thereby generating vortices and turbulence in a local area, which greatly enhances the fluid shearing and mixing effect and further improves the uniformity and efficiency of grinding.

[0048] In one embodiment, the outlet 51 protruding from the inner wall surface of the grinding cylinder 1 is configured as a conical cylinder structure. The internal flow of the conical cylinder is used to converge and accelerate the jet to enhance the impact and flow effect. The outer wall surface of the conical cylinder is used to enhance the flow of fluid during the grinding process and prevent material from lingering on its surface.

[0049] In this embodiment, the outlet 51, protruding from the inner wall surface of the grinding cylinder 1, is constructed as a conical cylinder structure. The inner wall surface of this conical cylinder forms a narrowing flow channel, which can converge and accelerate the fluid during ejection, significantly enhancing the jet's impact force, penetration distance, and directionality, resulting in more efficient momentum transfer. Simultaneously, its protruding conical outer wall surface itself forms an optimized flow-around column within the grinding chamber. This not only more effectively disrupts laminar flow near the wall and generates controllable vortices to improve the overall turbulence and mixing efficiency of the flow field, but its smooth, sloping structure also greatly reduces the risk of material adhesion and deposition, achieving a self-cleaning effect. Therefore, this conical cylinder structure integrally solves the two major problems of jet energy concentration and global flow field optimization, making the outlet 51 both a highly efficient jet nozzle and a dynamic flow disruptor, significantly improving the grinding intensity, uniformity, and process stability at the microscale.

[0050] In one embodiment, the grinding disc 2 is provided with a return concave hole 21;

[0051] When the outlet 51 of the jet exciter 5 is directly opposite the return concave hole 21, the injected cleaning fluid can be injected into the return concave hole 21 and turned to clean the area outside the outlet 51.

[0052] In this embodiment, the return concave hole 21 can be specifically set at the outer end of the pin of the pin-type grinding turntable 2, or at key positions such as the wheel surface of the turbine structure.

[0053] When the outlet 51 of the jet exciter 5 is directly facing the return concave hole 21 during the cleaning stage, the high-pressure cleaning fluid jet will be directly injected into the interior of the return concave hole 21. Under the constraint of the return concave hole 21, the fluid undergoes forced reversal, and its flow direction and kinetic energy are redistributed, thereby forming one or more reflected or scattered flows that diffuse towards the outside of the outlet 51, the root, and the surrounding complex surfaces.

[0054] Furthermore, during the cleaning phase, the grinding disc 2 can be controlled to rotate intermittently. This operating mode allows the return concave orifice 21 to maintain a longer alignment and dwell time with the specific outlet 51, rather than just a fleeting moment. At this time, the cleaning fluid can be continuously and sufficiently injected into the return concave orifice 21, ensuring its interior is completely filled and establishing a stable reflective flow field, thereby maximizing and stabilizing the surrounding flushing effect on the dead corner outside the outlet 51. Intermittent rotation allows each jet exciter 5 to obtain sufficient cleaning time at its corresponding optimal position, achieving systematic and thorough deep cleaning of all key points within the grinding chamber. This not only greatly improves the thoroughness and reliability of the maintenance cleaning of the jet exciter 5 itself and its surrounding area, but also further improves cleaning efficiency and reduces the total consumption of cleaning fluid by optimizing the cleaning process, thereby ensuring long-term residue-free operation within the grinding chamber and maintaining the sustained stability of equipment performance.

[0055] In one embodiment, the outlet 51 of a portion of the jet exciter 5 is configured to face a geometry on the grinding disc 2, the geometry including at least one of an angled region, a groove, or a gap, specifically, the geometry such as a pin root angle, a groove between turbine blades, or a component assembly gap, etc.

[0056] During the cleaning stage, the cleaning fluid ejected from the outlet 51 can directly impact the geometry to achieve effective cleaning of the complex surface of the grinding disc 2.

[0057] In this embodiment, the cleaning process can be carried out in stages: In the initial stage of cleaning, the grinding disc 2 is controlled to rotate intermittently. At this time, the specific outlet 51 can be aligned with the target geometry for a long time, ensuring that the high-pressure jet can continuously and fully act on the most stubborn stains to achieve deep and targeted cleaning. Then, in the middle stage of cleaning, sufficient clean water is injected into the grinding cylinder 1 through the feed pipe 3 until it is full, and the grinding disc 2 is controlled to rotate continuously. The continuously rotating grinding disc 2 drives the water in the cylinder to form a strong turbulent flow, which works in conjunction with the cleaning flow continuously sprayed from the jet exciters 5 at various locations to thoroughly flush and replace the entire cavity with fluid, completely suspending the removed residues and discharging them from the discharge pipe 4 with the water flow.

[0058] In one embodiment, a plurality of the jet exciters 5 are arranged in a ring array along the axial direction of the grinding cylinder 1 to form multiple columns; in each column, each jet exciter 5 is arranged at equal intervals along the axial length direction of the grinding cylinder 1.

[0059] In this embodiment, the annular array arrangement ensures that active jet sources are evenly distributed around the 360-degree circumference of the grinding cylinder 1. This ensures that regardless of the phase of the grinding disc 2's rotation, the surrounding flow field receives uniform and symmetrical momentum injection, effectively eliminating potential dead zones or low-speed zones in traditional designs. This guarantees the uniformity of material dispersion in the radial direction. The axially arranged multiple rows at equal intervals achieve full coverage of the entire grinding working area, ensuring that the material undergoes continuous and enhanced shearing during transport from the feed end to the discharge end. This guarantees the consistency of the grinding process in the axial direction and improves the overall particle size distribution quality of the product.

[0060] In one embodiment, in each column, the one-way water inlet pipe 54 of each jet exciter 5 is connected to a branch water pipe 55; the water inlet end of each branch water pipe 55 is provided with a control valve 56; all the branch water pipes 55 are connected to a main water pipe 57.

[0061] In this embodiment, by integrating the supply pipeline of each jet exciter 5 into an independent water distribution pipe 55 and equipping it with a dedicated control valve 56, independent control of the cleaning process by zone is achieved. The operator can flexibly open, close, or adjust the opening degree and cleaning time of specific branch valves according to the degree of contamination or process requirements of different axial areas within the grinding chamber, thereby improving the cleaning effect while optimizing the consumption of cleaning media and time. The main water pipe 57, serving as a unified supply source, simplifies external interfaces and ensures the initial stability of the cleaning fluid pressure and supply in each branch.

[0062] In one embodiment, the jet exciter 5 is a synthetic dual jet exciter, which is divided into two independent excitation chambers 52 by a vibrating diaphragm 53; each of the excitation chambers 52 is connected to a corresponding outlet 51 and a one-way water inlet pipe 54.

[0063] In this embodiment, during the grinding stage, the two excitation chambers 52 can work alternately under drive (e.g., with a phase difference of 180 degrees), causing the corresponding two outlets 51 to alternately eject jets. This working mode can transform the pulsed disturbance of a single point source into a high-frequency, nearly continuous directional momentum output, generating a more stable and stronger turbulent synthetic flow field within the grinding chamber, thereby significantly improving the crushing efficiency and dispersion uniformity of material agglomerates. During the cleaning stage, the structural advantages of the dual chambers and dual pipelines (two unidirectional water inlet pipes 54) are fully utilized. On the one hand, the cleaning fluid can simultaneously flush the two independent chambers, avoiding the flow dead zones that may exist inside a single chamber, ensuring the thorough cleaning of the exciter itself; on the other hand, the two outlets 51 can alternately eject cleaning streams, forming a cross-covering cleaning flow field, significantly expanding the flushing coverage and impact intensity of the inner wall of the grinding cylinder 1 and the grinding disc 2, achieving cleaning without dead angles.

[0064] The present invention also provides a sand milling method using the above-mentioned sand milling structure for grinding water-based paint raw materials, comprising the following steps:

[0065] Grinding stage:

[0066] Close the one-way water inlet pipe 54;

[0067] The jet exciter 5 is controlled to operate, causing its excitation chamber 52 to expand and contract periodically;

[0068] When the excitation chamber 52 expands, fluid is drawn in from inside the grinding cylinder 1;

[0069] When the excitation chamber 52 contracts, the fluid drawn in is ejected from the outlet 51 in the form of a jet to improve the fluid disturbance and grinding effect in the grinding cylinder 1.

[0070] Cleaning stage:

[0071] Cleaning fluid is injected unidirectionally into the excitation chamber 52 through the one-way water inlet pipe 54.

[0072] The jet exciter 5 is controlled to operate as a volumetric pump, so that the cleaning fluid flows sequentially through the excitation chamber 52 and the outlet 51, and is sprayed into the interior of the grinding cylinder 1 to clean the inner wall of the grinding cylinder and the grinding disc 2.

[0073] The sand milling method provided by this invention achieves efficient integration of grinding enhancement and cleaning optimization through the functional switching of a jet exciter 5 at different process stages. In the grinding stage, the jet exciter 5 acts as a momentum generator with zero net flow addition, actively and directionally enhancing the turbulence and shear of the grinding flow field by periodically drawing in and high-speed ejecting fluid from its cavity, thereby significantly improving grinding efficiency and the consistency of product fineness. In the cleaning stage, this method switches the fluid path and control logic, transforming the jet exciter 5 into a volumetric pump supplied by a unidirectional water inlet pipe 54. Utilizing the specific spatial distribution of its outlet 51, it performs high-pressure, directional flushing of the inner wall of the grinding cylinder 1, the surface of the grinding disc 2, and all complex geometric dead corners. This method fundamentally solves the problems of separation of grinding and cleaning processes, incomplete cleaning, and long downtime in traditional sand milling equipment. While ensuring ultimate grinding performance, it achieves rapid, thorough, and programmable online cleaning, greatly improving equipment utilization, production continuity, and product quality stability.

[0074] As shown in Figure 5, the present invention also provides a sand mill, including the above-mentioned sand mill structure for grinding water-based paint raw materials.

[0075] The above description is merely an embodiment and does not constitute any limitation on the present invention. Any person skilled in the art can make many possible variations, modifications, or alterations to the technical solutions of the present invention without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A sand mill structure for grinding water-based paint raw materials, comprising a grinding cylinder (1), a grinding disc (2) disposed within the grinding cylinder (1), a feed pipe (3) disposed on one side of the grinding cylinder (1), and a discharge pipe (4) disposed on the other side of the grinding cylinder (1), wherein the grinding disc (2) is configured as a pin-type or turbine-type structure, characterized in that: The grinding cylinder (1) is provided with a plurality of jet actuators (5) inside its inner wall. The outlet (51) of the jet actuator (5) is connected to the inside of the grinding cylinder (1) to generate a jet that enhances the grinding effect. Each jet actuator (5) is connected to a one-way water inlet pipe (54) on its excitation chamber (52) for injecting cleaning fluid into the excitation chamber (52) during the cleaning stage. During the cleaning stage, the cleaning fluid can be injected into the excitation chamber (52) through the one-way water inlet pipe (54) and then flow through the outlet (51) to be sprayed into the interior of the grinding cylinder (1) to clean the inner wall of the grinding cylinder and the grinding disc (2).

2. The sand mill structure for grinding water-based paint raw materials as described in claim 1, characterized in that, The outlet (51) of the jet exciter (5) protrudes from the inner wall surface of the grinding cylinder (1) to form a flow-around structure that enhances fluid disturbance.

3. The sand mill structure for grinding water-based paint raw materials according to claim 2, characterized in that, The outlet (51) protruding from the inner wall surface of the grinding cylinder (1) is constructed into a conical cylinder structure. The internal flow of the conical cylinder is used to converge and accelerate the jet to enhance the impact and flow effect. The outer wall surface of the conical cylinder is used to enhance the flow of fluid during the grinding process and prevent the material from lingering on its surface.

4. The sand mill structure for grinding water-based paint raw materials as described in claim 2, characterized in that, The grinding disc (2) is provided with a return concave hole (21); when the outlet (51) of the jet exciter (5) is facing the return concave hole (21), the injected cleaning fluid can be injected into the return concave hole (21) and turn to clean the area outside the outlet (51).

5. The sand mill structure for grinding water-based paint raw materials according to any one of claims 1-4, characterized in that, The outlet (51) of a portion of the jet exciter (5) is configured to face a geometry on the grinding disc (2), the geometry including at least one of an angled region, a groove or a slit; during the cleaning phase, the cleaning fluid ejected from the outlet (51) can directly impact the geometry to achieve effective cleaning of the complex surface of the grinding disc (2).

6. The sand mill structure for grinding water-based paint raw materials according to any one of claims 1-4, characterized in that, Several jet exciters (5) are arranged in a ring array along the axial direction of the grinding cylinder (1) to form multiple columns; in each column, each jet exciter (5) is arranged at equal intervals along the axial length direction of the grinding cylinder (1).

7. The sand mill structure for grinding water-based paint raw materials according to claim 6, characterized in that, In each column, the one-way water inlet pipe (54) of each jet exciter (5) is connected to a branch water pipe (55); each branch water pipe (55) is equipped with a control valve (56) at its water inlet end; all the branch water pipes (55) are connected to a main water pipe (57).

8. The sand mill structure for grinding water-based paint raw materials according to any one of claims 1-4, characterized in that, The jet exciter (5) is a synthetic dual jet exciter, which is divided into two independent excitation chambers (52) by a vibrating diaphragm (53); each of the excitation chambers (52) is connected to a corresponding outlet (51) and a one-way water inlet pipe (54).

9. A sand grinding method, characterized in that, The sand mill structure for grinding water-based paint raw materials as described in any one of claims 1-8 includes the following steps: Grinding stage: closing the one-way water inlet pipe (54); controlling the jet exciter (5) to work, causing its excitation chamber (52) to periodically expand and contract; when the excitation chamber (52) expands, fluid is drawn in from inside the grinding cylinder (1); when the excitation chamber (52) contracts, the drawn-in fluid is ejected from the outlet (51) in the form of a jet to improve the fluid disturbance and grinding effect inside the grinding cylinder (1); Cleaning stage: injecting cleaning fluid unidirectionally into the excitation chamber (52) through the one-way water inlet pipe (54); controlling the jet exciter (5) to work as a volumetric pump, causing the cleaning fluid to flow sequentially through the excitation chamber (52) and the outlet (51), and spraying into the inside of the grinding cylinder (1) to clean the inner wall of the grinding cylinder and the grinding disc (2).

10. A sand mill, characterized in that, It includes the sand mill structure for grinding water-based paint raw materials as described in any one of claims 1-8.

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