Grinding device for coating production

Abstract

The invention provides a grinding device for coating production, and relates to the technical field of coating grinding, the grinding device comprises a cylinder and a grinding shaft, the grinding shaft is driven by a driving mechanism, a filter disc is mounted on the grinding shaft, and the cylinder is divided into a first-stage grinding cavity and a second-stage grinding cavity; a plurality of grinding rods are mounted on the grinding shaft in the first-stage grinding cavity, and a plurality of grinding discs are mounted on the grinding shaft in the second-stage grinding cavity; a return pipe is communicated between the first-stage grinding cavity and the second-stage grinding cavity, and an auger is mounted in the return pipe. Large-particle materials in the first-stage grinding cavity can enter the second-stage grinding cavity through the filter disc to be continuously ground after being ground, small-particle materials which do not meet the fineness requirement in the second-stage grinding cavity can flow back to the first-stage grinding cavity through the backflow pipe to be ground again, and the small-particle materials enter the second-stage grinding cavity through the filter disc. And circular flowing of small-particle materials is achieved, the flowability of the materials in the first-stage grinding cavity can be improved, and therefore the phenomena of material blocking and heating can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coating grinding, in particular to a grinding device for coating production. Background Art

[0002] Paint is a material applied to the surface of an object to be protected or decorated, forming a thin, continuous film that adheres firmly to the surface. It is typically formulated with a resin, oil, or emulsion, with or without pigments and fillers, and additives, using organic solvents or water. The paint production process typically includes pre-dispersion, grinding, mixing and adjustment, color matching, testing, filtration, and packaging. Grinding involves using a grinding device to refine solid particles such as pigments and fillers and evenly disperse them throughout the base material.

[0003] Horizontal sand mills are commonly used in the production of latex paints and other architectural coatings. Glass balls are often used as grinding media due to their moderate hardness and their ability to prevent contamination of latex paint. During grinding, the material and grinding media are agitated by the high-speed grinding disc, gradually disaggregating or pulverizing agglomerated pigment and filler particles to the desired fineness.

[0004] For example, patent publication number CN214554073U discloses a horizontal sand mill. This horizontal sand mill comprises a base, a sand milling drum mounted on the base, a feed pipe and a discharge pipe mounted on the sand milling drum, a rotating shaft rotatably connected to the sand milling drum, and a plurality of grinding discs connected to the shaft. A drive mechanism is mounted on the base to drive the shaft. Liquid material enters the sand milling drum through the feed pipe, where the drive mechanism drives the shaft and grinding discs to rotate at high speed, wet-grinding the liquid material. The ground liquid material is then discharged through the discharge pipe.

[0005] However, when a horizontal sand mill is operating, the grinding media rotates and tumbles at high speed within the barrel, causing intense friction between the grinding media and the material, the inner wall of the barrel, the grinding disc, and other components. This friction generates a large amount of heat, which can easily cause the horizontal sand mill to overheat and affect its lifespan. To improve the heating problem of the horizontal sand mill, patent document CN118204162B discloses a horizontal sand mill that grinds materials in sections. The horizontal sand mill is equipped with a primary grinding chamber and a secondary grinding chamber. The material enters the primary grinding chamber of the grinding equipment. After the large-particle raw material undergoes initial crushing in the primary grinding chamber, it reaches the secondary grinding chamber and, as the rotating shaft rotates, enters the secondary grinding chamber for further crushing. By providing a segmented grinding chamber, the grinding speed and grinding force of the primary grinding chamber are lower than those of the secondary grinding chamber, thereby reducing the occurrence of blockage and severe heating caused by excessively large particle size and strong force during initial feeding of the device.

[0006] However, the material particles in the primary grinding chamber are large, and there is a large contact area and rough surface between the materials. When the material moves in the sand mill, the friction between the particles will increase, thereby hindering the smooth flow of the material, causing the movement of the grinding media in the cylinder to be hindered and unable to be evenly dispersed in the material, thereby making the collision and friction between the grinding media and the inner wall of the cylinder, the impeller and other components more intense, thereby generating more heat, causing the equipment to heat up. Summary of the Invention

[0007] In view of this, the present invention provides a grinding device for coating production, which solves the technical problem in the prior art that when grinding materials, the grinding media rotates and tumbles at high speed in the cylinder, causing the equipment to heat up.

[0008] To solve the above technical problems, the present invention provides a grinding device for coating production, comprising a cylinder mounted on a frame, a grinding shaft rotatably mounted in the cylinder, the grinding shaft being driven by a driving mechanism, and a filter disc mounted on the grinding shaft, dividing the cylinder into a primary grinding chamber and a secondary grinding chamber; A plurality of grinding rods are installed in the first-level grinding chamber on the grinding shaft, and a plurality of grinding discs are installed in the second-level grinding chamber on the grinding shaft; A return pipe is connected between the primary grinding chamber and the secondary grinding chamber. An auger is installed in the return pipe to allow the material in the secondary grinding chamber to enter the primary grinding chamber. The auger is driven by a driving mechanism.

[0009] By adopting the above technical solution, large particles are transported to the primary grinding chamber for grinding, and small particles are transported to the secondary grinding chamber for grinding. The material ground in the primary grinding chamber can pass through the filter disc into the secondary grinding chamber for further grinding. The primary grinding chamber is equipped with multiple grinding rods to perform preliminary coarse grinding and dispersion of the coating raw materials. The design of the grinding rods ensures that the material has been refined to a certain extent before entering the secondary grinding chamber, laying the foundation for subsequent fine grinding. The secondary grinding chamber is equipped with multiple grinding discs, which can further finely grind the material to achieve a smaller particle size distribution and higher grinding accuracy. The design of graded grinding allows the material to be gradually refined, improving grinding efficiency while reducing material blockage and cylinder heating.

[0010] The grinding rod, located within the primary grinding chamber, is particularly effective when handling materials containing larger particles. Its longer shape provides a greater reach, effectively moving large particles within the grinding chamber, allowing them to more easily engage the grinding media and undergo grinding. Furthermore, the grinding rod's movement reduces the likelihood of large particles becoming stuck or accumulating within the machine.

[0011] A return pipe connects the primary and secondary grinding chambers, allowing material in the secondary chamber that doesn't meet the required fineness to flow back to the primary chamber for further grinding. This design avoids material waste and improves material utilization. Because the material ground in the primary chamber is larger and less fluid, while the material in the secondary chamber is smaller and more fluid, the circulating material in the secondary chamber improves the fluidity of the material in the primary chamber, thereby reducing material sticking and overheating.

[0012] The auger is installed in the return pipe and driven by the drive mechanism, which can actively transport the material in the secondary grinding chamber to the primary grinding chamber. The auger design not only improves the return efficiency of the material, but also helps to improve the uniformity and stability of the material during the return process.

[0013] The filter disc can prevent the larger grinding media and materials in the primary grinding chamber from flowing into the secondary grinding chamber, thereby causing the secondary grinding chamber to get stuck.

[0014] Preferably, the grinding rod comprises a rod body 1 mounted on the grinding shaft and a rod body 2 spherically connected to the rod body 1, and a return spring is further connected between the rod body 1 and the rod body 2.

[0015] By adopting this technical solution, rods 1 and 2 are connected using a ball joint. This connection allows rod 2 to rotate freely in multiple directions, allowing the grinding rod to flexibly adjust the grinding angle and direction according to the surface shape and unevenness of the material. This adaptive ability promotes uniform contact with the material surface during the grinding process, improving grinding quality. Because the grinding rod can better adapt to the material surface, the number of re-grindings caused by uneven grinding is reduced. Furthermore, the presence of a return spring ensures that the grinding rod quickly returns to its original position after being subjected to external forces, maintaining the stability of the grinding process and thus improving overall grinding efficiency.

[0016] Because the primary grinding chamber is filled with large-particle material and grinding media, when the grinding rods come into contact with the grinding media, the grinding media's irregular movement within the material and contact with the grinding rods may cause the grinding media to exert forces on the rods from various directions. The ball joint design allows the secondary rod to automatically adjust its angle based on the direction of the force applied by the grinding media, preventing a rigid jam with the grinding media and thus facilitating smooth grinding of the material. When the grinding media and grinding rods become jammed, their relative motion with the barrel wall is hindered, dramatically increasing friction. This increased friction converts more mechanical energy into heat, leading to increased barrel wall temperature.

[0017] Preferably, the filter disc is provided with a plurality of filter holes, which are distributed in a plurality of concentric rings on the filter disc. A plurality of guide grooves are provided on the side of the filter disc close to the primary grinding chamber and located at the filter holes, and the opening direction of the guide grooves is opposite to the rotation direction of the filter disc.

[0018] By adopting this technical solution, when the filter disc rotates, the guide grooves push the material in the primary grinding chamber toward the filter holes, accelerating the flow of material into the secondary grinding chamber. This reduces the time the material stays in the primary grinding chamber, allowing more material to enter the secondary grinding chamber for further grinding, thereby improving grinding efficiency.

[0019] Because small particles in the primary grinding chamber flow better, the thrust of the guide grooves allows them to more easily pass through the filter holes and enter the secondary grinding chamber, thereby improving the fluidity of the material in the primary grinding chamber. The guide grooves can change the flow direction and speed of large particles, distributing them more evenly across the filter disc surface rather than concentrating them near the filter holes. Furthermore, the guide grooves promote the flow of material around the filter holes, promptly removing any large particles that may have accumulated, thereby reducing filter hole clogging.

[0020] Preferably, the grinding disc is triangular, and there is an angular deflection between two adjacent grinding discs, and a plurality of grinding holes are provided on the grinding disc.

[0021] By adopting this technical solution, the triangular grinding disc design features more irregular edges than traditional circular shapes. As the grinding disc rotates within the cylinder, it creates a more complex motion path for the material and grinding media. The angular deflection between adjacent grinding discs further disrupts the normal flow pattern of the material and grinding media, allowing them to collide and rub more frequently, increasing contact opportunities and thus improving grinding efficiency.

[0022] During the grinding process, materials may agglomerate, affecting the grinding effect. The complex flow and shear forces generated by the triangular grinding disc and the angled deflection can effectively break up the material agglomerates, allowing the material to participate in the grinding in a more dispersed state, thereby helping to improve the uniformity and efficiency of the grinding.

[0023] The grinding holes not only facilitate the passage of materials and grinding media, but also make it easy to clean the grinding disc during equipment maintenance.

[0024] Preferably, a shell is installed on the outside of the cylinder, a cooling cavity is left between the shell and the cylinder, and the cooling cavity is filled with coolant.

[0025] By adopting the above technical solution, during the grinding process, the grinding media collides and rubs violently with the material, the inner wall of the cylinder, the grinding disc, and other components. These mechanical actions generate a large amount of heat, causing the temperature inside the cylinder to rise sharply. The coolant filled in the cooling chamber between the shell and the cylinder can absorb this heat in time, helping to reduce the temperature of the cylinder.

[0026] Preferably, the rod body 1, the grinding disc and the grinding shaft are all connected by a key, a plurality of sleeves 1 are provided at intervals in the primary grinding chamber on the grinding shaft, the grinding rod is located between two adjacent sleeves 1, a plurality of sleeves 2 are provided at intervals in the secondary grinding chamber on the grinding shaft, the grinding disc is located between two connected sleeves 2, an end sleeve is installed at the end of the grinding shaft, and the end sleeve is connected to the grinding shaft by a bolt.

[0027] By adopting this technical solution, the rod body (1), grinding disc, and grinding shaft are connected by a key, which transmits torque between the shaft and the rotating component. The grinding rods are positioned between two adjacent sleeves (1), ensuring that they are evenly distributed within the primary grinding chamber. This increases the contact area between the grinding rods and the material, improving grinding efficiency. Sleeves (1) also serve to position and support the grinding rods.

[0028] The grinding discs are positioned between two connected second sleeves, allowing them to be arranged at regular intervals within the secondary grinding chamber, creating multiple grinding zones. After initial grinding in the primary grinding chamber, the material enters the secondary grinding chamber, where it undergoes further grinding between the different grinding discs, thereby increasing the fineness of the grind. The second sleeve also isolates and protects the grinding discs, reducing interference and wear between them.

[0029] During assembly, the grinding rod, grinding disc, and end sleeves are easily installed onto the grinding shaft. When maintenance or component replacement is required, these components can be easily removed, reducing repair time and costs. By adjusting the position of sleeves 1 and 2 on the grinding shaft, the spacing between the grinding rod and grinding disc can be easily varied to accommodate the grinding requirements of different materials.

[0030] Preferably, a support sleeve is installed on the frame, and the end of the grinding shaft away from the end sleeve passes through the support sleeve.

[0031] By adopting this technical solution, the support sleeve provides strong support for the grinding shaft, reducing bending or deformation caused by uneven force during operation. It also limits radial displacement of the grinding shaft, reducing vibration and shaking. During high-speed rotation, even small vibrations can cause the gap between the grinding parts to shift, affecting the grinding effect. The presence of the support sleeve ensures that the grinding shaft maintains a relatively stable rotation trajectory, improving the operating accuracy and stability of the equipment.

[0032] Preferably, a first material inlet is provided in the first-stage grinding chamber on the cylinder, a second material inlet and a material outlet are provided in the second-stage grinding chamber on the cylinder, and a filter is provided at the material outlet.

[0033] By adopting this technical solution, small particles enter the secondary grinding chamber from material inlet 2 for grinding, while large particles enter the primary grinding chamber from material inlet 1 for grinding. They then pass through the filter disc into the secondary grinding chamber for further grinding. Materials that meet the particle size requirements pass through the filter screen and are discharged from the material outlet, which helps improve grinding efficiency. Compared to a design where both large and small particles enter the primary grinding chamber, this design also helps reduce blockage in the primary grinding chamber, thereby improving grinding efficiency.

[0034] Preferably, a mounting platform is provided on the frame, a slide rail is provided on the mounting platform, a mounting frame is provided on the shell, and a roller that can slide along the slide rail is rotatably connected to the mounting frame.

[0035] By adopting this technical solution, the housing can be flexibly moved relative to the rack by sliding the rollers along the rails. During equipment installation, the housing can be initially positioned on the rack using the rollers and rails, and then other components can be connected and secured. Compared to traditional fixed installation methods, this design reduces positioning difficulty and adjustment time during installation, thereby improving installation efficiency.

[0036] Preferably, the driving mechanism includes a driving motor arranged on the frame, a synchronous belt 1 connected between the output shaft of the driving motor and the grinding shaft, and a synchronous belt 2 connected between the grinding shaft and the central axis of the auger.

[0037] By adopting this technical solution, the drive motor drives the grinding shaft via synchronous belt 1, which in turn drives the grinding rod and grinding disc to achieve material grinding. The grinding shaft drives the auger via synchronous belt 2 to transfer the material from the secondary grinding chamber to the primary grinding chamber, which helps improve the fluidity of the material in the primary grinding chamber and thus helps reduce material jamming and heat generation.

[0038] The beneficial effects of the above technical solution of the present invention are as follows: 1. The present invention is provided with a primary grinding chamber and a secondary grinding chamber. After the large particle material in the primary grinding chamber is ground, it can enter the secondary grinding chamber through the filter disc for further grinding, thereby improving the grinding efficiency while reducing the clogging of the material and the heating of the cylinder; the small particle material in the secondary grinding chamber that does not meet the fineness requirements can flow back to the primary grinding chamber through the reflux pipe for re-grinding, and enter the secondary grinding chamber through the filter disc, realizing the circulation of the small particle material, which can improve the fluidity of the material in the primary grinding chamber, thereby helping to reduce the material jamming and heating.

[0039] 2. A grinding rod is installed on the grinding shaft in the first-level grinding chamber. Rod body 1 and rod body 2 of the grinding rod are connected by ball joint and connected with a return spring. This design allows rod body 2 to automatically adjust its angle according to the direction of the force applied by the grinding medium, avoiding a rigid stuck state with the grinding medium, which is conducive to the smooth grinding of the material and reduces the heating of the cylinder caused by the increased friction when the grinding medium and the grinding rod are stuck.

[0040] 3. The filter holes of the filter disc are equipped with guide grooves, which can accelerate the flow of small particles to the secondary grinding chamber, which is beneficial to improve the fluidity of the material in the primary grinding chamber, thereby reducing the material sticking and heating phenomena. At the same time, it can change the flow direction and speed of large particles and reduce the blockage of the filter holes by large particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic structural diagram of a grinding device for coating production according to the present invention; Figure 2 A side view of a grinding apparatus for producing the coating of the present invention; Figure 3 A cross-sectional view of a grinding apparatus for producing the coating of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 It is a structural schematic diagram of the grinding shaft of the present invention; Figure 7 2 is a cross-sectional view of the grinding rod of the present invention.

[0042] In the figure: 1. Frame; 11. Support sleeve; 12. Mounting platform; 13. Slide rail; 2. Cylinder; 21. Primary grinding chamber; 211. Material inlet 1; 22. Secondary grinding chamber; 221. Material inlet 2; 222. Material outlet; 3. Grinding shaft; 31. Filter plate; 311. Filter hole; 312. Guide groove; 32. Grinding rod; 321. Rod 1; 322. Rod 2; 323. Return spring; 324. Groove 1; 325. Groove 2; 326, ball head; 327, mounting ring; 33, grinding disc; 331, grinding hole; 34, sleeve one; 35, sleeve two; 36, end sleeve; 361, bolt; 4, driving mechanism; 41, driving motor; 42, synchronous belt one; 43, synchronous belt two; 44, pulley; 5, return pipe; 51, auger; 52, connecting rod; 6, housing; 61, coolant inlet; 62, coolant outlet; 63, mounting bracket; 64, roller. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the embodiments of the present invention. Figure 1-Figure 7 , clearly and completely describe the technical solutions of the embodiments of the present invention.

[0044] Example This embodiment provides a grinding device for coating production, which is used for wet grinding. Figure 1 and Figure 3 As shown, the grinding device includes a frame 1, a cylinder 2 installed on the frame 1, and a grinding shaft 3 rotatably connected to the cylinder 2. The grinding shaft 3 is driven by a driving mechanism 4.

[0045] like Figure 2 and Figure 3 As shown, a housing 6 is mounted on the outside of the cylinder 2. The axis of the housing 6 is collinear with the axis of the cylinder 2. A cooling cavity is defined between the housing 6 and the cylinder 2. The cooling cavity is filled with coolant. A coolant inlet 61 is provided at one end of the housing 6, and a coolant outlet 62 is provided at the other end. The coolant circulates through the housing 6 to cool the cylinder 2.

[0046] like Figure 3 As shown, a support sleeve 11 is mounted on the frame 1. The support sleeve 11 is located at one end of the cylinder 2. One end of the grinding shaft 3 passes through one end of the cylinder 2 and the support sleeve 11 in sequence. A bearing is connected between the support sleeve 11 and the grinding shaft 3. The axes of the support sleeve 11, the grinding shaft 3, and the cylinder 2 are collinear.

[0047] like Figure 3 As shown, the support sleeve 11 can provide strong support for the grinding shaft 3, reduce the bending or deformation of the grinding shaft 3 due to uneven force during operation, and at the same time limit the radial displacement of the grinding shaft 3, reducing its vibration and shaking.

[0048] like Figure 3 As shown, a filter disc 31 is installed on the grinding shaft 3 , and the axis of the filter disc 31 is colinear with the axis of the grinding shaft 3 . The filter disc 31 divides the cylinder 2 into a primary grinding chamber 21 and a secondary grinding chamber 22 .

[0049] like Figure 3 As shown, the cylinder 2 is provided with a first material inlet 211 in the primary grinding chamber 21, and a second material inlet 221 and a material outlet 222 in the secondary grinding chamber 22. A filter is provided at the material outlet 222. The first material inlet 211, the second material inlet 221, and the material outlet 222 all pass through the side wall of the housing 6.

[0050] like Figure 3As shown, small particle materials continue to enter the secondary grinding chamber 22 from the material inlet 221 for grinding, and large particle materials continue to enter the primary grinding chamber 21 from the material inlet 1 211 for grinding, and then pass through the filter disc 31 into the secondary grinding chamber 22 for further grinding. Materials that meet the particle size requirements continue to pass through the filter screen and are discharged from the material outlet 222.

[0051] like Figure 3 As shown, multiple grinding rods 32 are mounted on the grinding shaft 3 within the primary grinding chamber 21. These rods 32 are evenly spaced around the circumference of the grinding shaft 3. These rods 32 effectively propel large particles within the grinding chamber, allowing them to more easily contact and grind the grinding media. Furthermore, the movement of the rods 32 reduces the likelihood of large particles becoming stuck or accumulating within the equipment.

[0052] like Figure 7 As shown, the grinding rod 32 includes a rod body 1 321 mounted on the grinding shaft 3 and a rod body 2 322 spherically connected to the rod body 1 321 , and a return spring 323 is connected between the rod body 1 321 and the rod body 2 322 .

[0053] Specifically, Figure 7 As shown, a ball head 326 is connected to the end of the rod body 1 321 near the rod body 2 322, and a groove 1 324 is provided at the end of the rod body 1 321 near the ball head 326. The groove 1 324 passes through the ball head 326. A groove 2 325 is provided at the end of the rod body 2 322 near the rod body 1 321. The ball head 326 is rotatably connected in the groove 2 325. One end of the return spring 323 is connected to the groove 2 325, and the other end of the return spring 323 is connected to the groove 1 324. The return spring 323 is a torsion spring.

[0054] like Figure 7 As shown, this design allows the rod body 2 322 to automatically adjust its own angle according to the direction of the force applied by the grinding medium, avoiding a rigid stuck state with the grinding medium, thereby facilitating smooth material grinding and reducing the heating of the cylinder 2 caused by the increased friction between the grinding medium and the grinding rod 32 when they are stuck.

[0055] like Figure 3 and Figure 6 As shown, a plurality of grinding discs 33 are installed at intervals in the secondary grinding chamber 22 on the grinding shaft 3; the grinding discs 33 are triangular, and there is an angular deflection between two adjacent grinding discs 33, that is, along the axial direction of the grinding shaft 3, two adjacent grinding discs 33 do not overlap, and a plurality of grinding holes 331 are provided on the grinding discs 33.

[0056] like Figure 3 and Figure 6As shown, when the grinding discs 33 rotate within the barrel 2, the triangular grinding discs 33 can agitate the material and grinding media, creating a more complex motion path. The angular deflection between adjacent grinding discs 33 further disrupts the normal flow pattern of the material and grinding media, allowing them to collide and rub more frequently, increasing contact opportunities and thereby improving grinding efficiency.

[0057] like Figure 3 and Figure 7 As shown, the rod 1 321, the grinding disc 33, the filter disc 31, and the grinding shaft 3 are all connected by keys. Specifically, the rod 1 321 is mounted on the mounting ring 327, which is sleeved on the grinding shaft 3. The grinding disc 33 and the filter disc 31 are both sleeved on the grinding shaft 3. The grinding shaft 3 is provided with a keyway, and the mounting ring 327, the grinding disc 33, and the filter disc 31 are all provided with keys that cooperate with the keyway.

[0058] like Figure 3 and Figure 4 As shown, a plurality of sleeves 1 34 are provided at intervals in the primary grinding chamber 21 on the grinding shaft 3, a grinding rod 32 is located between two adjacent sleeves 1 34, a plurality of sleeves 2 35 are provided at intervals in the secondary grinding chamber 22 on the grinding shaft 3, a grinding disc 33 is located between two connected sleeves 2 35, a filter disc 31 is located between two adjacent sleeves 1 34 and sleeves 2 35, an end sleeve 36 is installed at the end of the grinding shaft 3, and the end sleeve 36 is connected to the grinding shaft 3 by a bolt 361.

[0059] like Figure 3 and Figure 4 As shown, during the assembly process, the grinding rod 32, grinding disc 33, end sleeve 36 and other components can be easily installed on the grinding shaft 3. When the equipment needs to be maintained or parts replaced, these components can also be easily disassembled, reducing maintenance time and cost.

[0060] like Figure 3 and Figure 5 As shown, a return pipe 5 is connected between the primary grinding chamber 21 and the secondary grinding chamber 22. The return pipe 5 is located at the lower part of the cylinder 2. An auger 51 is rotatably installed in the return pipe 5 to allow the material in the secondary grinding chamber 22 to enter the primary grinding chamber 21. The auger 51 is driven by the driving mechanism 4.

[0061] like Figure 3 and Figure 5As shown, the return pipe 5 connects the primary grinding chamber 21 and the secondary grinding chamber 22, allowing material in the secondary grinding chamber 22 that does not meet the fineness requirements to flow back to the primary grinding chamber 21 for re-grinding and enter the secondary grinding chamber 22 through the filter disc 31, thereby achieving a circulation flow of small-particle material. Because the material ground in the primary grinding chamber 21 is larger in particle size and has poor fluidity, the material in the secondary grinding chamber 22 is relatively smaller in particle size and has better fluidity. The circulating material in the secondary grinding chamber 22 can improve the fluidity of the material in the primary grinding chamber 21, thereby helping to reduce material jamming and heat generation.

[0062] like Figure 3 As shown, the driving mechanism 4 includes a driving motor 41 arranged on the frame 1, a synchronous belt 1 42 connected between the output shaft of the driving motor 41 and the grinding shaft 3, and a synchronous belt 2 43 connected between the grinding shaft 3 and the central axis of the auger 51.

[0063] Among them, Figure 3 and Figure 5 As shown, a connecting rod 52 is rotatably connected to one end of the central axis of the auger 51 on the frame 1, and the connecting rod 52 is connected to the central axis of the auger 51 by a coupling. Pulleys 44 are installed on the end of the connecting rod 52, the end of the grinding shaft 3 and the output shaft of the drive motor 41. Synchronous belt 1 42 is connected between the pulley 44 on the grinding shaft 3 and the pulley 44 on the output shaft of the drive motor 41, and synchronous belt 2 43 is connected between the pulley 44 on the grinding shaft 3 and the pulley 44 on the connecting rod 52.

[0064] like Figure 3 and Figure 5 As shown, the drive motor 41 rotates the grinding shaft 3 via a synchronous belt 1 42, which in turn drives the grinding rod 32 and grinding disc 33 to grind the material. The grinding shaft 3 rotates the auger 51 via a synchronous belt 2 43 to transfer the material from the secondary grinding chamber 22 to the primary grinding chamber 21, thereby improving the fluidity of the material in the primary grinding chamber 21 and reducing material jamming and heating.

[0065] like Figure 6 As shown, the filter disc 31 is provided with a plurality of filter holes 311, which form an annular structure. Along the radial direction of the filter disc 31, multiple concentric annular structures are formed. A plurality of guide grooves 312 are provided on the filter disc 31 near the primary grinding chamber 21 and located at the filter holes 311. The opening direction of the guide grooves 312 is opposite to the rotation direction of the filter disc 31. That is, when the filter disc 31 rotates clockwise, the opening direction of the guide grooves 312 on the annular filter holes 311 is distributed counterclockwise.

[0066] like Figure 3 and Figure 6As shown, when the filter disc 31 rotates, the guide groove 312 generates a thrust on the material in the primary grinding chamber 21 toward the filter holes 311, accelerating the flow of the material into the secondary grinding chamber 22. Since small particles in the primary grinding chamber 21 have better fluidity, the thrust of the guide groove 312 makes it easier for the small particles to pass through the filter holes 311 and enter the secondary grinding chamber 22, thereby improving the fluidity of the material in the primary grinding chamber 21.

[0067] like Figure 3 and Figure 6 As shown, the guide grooves 312 can change the flow direction and speed of large particles, so that the large particles are more evenly distributed on the surface of the filter disc 31, rather than being concentrated near the filter holes 311. At the same time, the guide grooves 312 can also promote the flow of materials around the filter holes 311, promptly removing any large particles that may have accumulated, thereby helping to reduce the phenomenon of large particles clogging the filter holes 311.

[0068] like Figure 1 As shown, the frame 1 is provided with a mounting platform 12, which is equipped with a slide rail 13. The housing 6 is provided with a mounting bracket 63, which is rotatably connected to a roller 64 that slides along the slide rail 13. The length of the slide rail 13 is parallel to the axial direction of the housing 6. During equipment installation, the housing 6 can be initially positioned on the frame 1 using the interaction between the roller 64 and the slide rail 13, and then other components can be connected and secured.

[0069] The implementation principle of a grinding device for coating production in this embodiment is as follows: Small particle materials continue to enter the secondary grinding chamber 22 from the material inlet 221 for grinding, and large particle materials continue to enter the primary grinding chamber 21 from the material inlet 1 211 for grinding, and then pass through the filter disc 31 into the secondary grinding chamber 22 for further grinding. Materials that meet the particle size requirements continue to pass through the filter screen and are discharged from the material outlet 222, thereby improving the grinding efficiency while reducing material blockage and heating of the cylinder 2.

[0070] Material within the secondary grinding chamber 22 that does not meet the required fineness can enter the return pipe 5 and be transported back to the primary grinding chamber 21 through the auger 51 for further grinding. It then enters the secondary grinding chamber 22 through the filter disc 31, achieving a circulation flow of small-particle material. Because the material ground in the primary grinding chamber 21 is larger in particle size and has poor fluidity, the material in the secondary grinding chamber 22 is relatively smaller in particle size and has better fluidity. The circulating material in the secondary grinding chamber 22 can improve the fluidity of the material in the primary grinding chamber 21, thereby helping to reduce material jamming and heat generation.

[0071] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components.

Claims

1. A grinding device for coating production, comprising a barrel (2) mounted on a frame (1), a grinding shaft (3) rotatably mounted in the barrel (2), the grinding shaft (3) being driven by a driving mechanism (4), and characterized in that: A filter disc (31) is mounted on the grinding shaft (3), dividing the cylinder (2) into a primary grinding chamber (21) and a secondary grinding chamber (22); A plurality of grinding rods (32) are installed on the grinding shaft (3) in the first-level grinding chamber (21), and a plurality of grinding discs (33) are installed on the grinding shaft (3) in the second-level grinding chamber (22); A return pipe (5) is connected between the primary grinding chamber (21) and the secondary grinding chamber (22). An auger (51) is installed in the return pipe (5) to allow the material in the secondary grinding chamber (22) to enter the primary grinding chamber (21). The auger (51) is driven by a driving mechanism (4).

2. The grinding device for coating production according to claim 1, characterized in that: The grinding rod (32) comprises a rod body 1 (321) mounted on the grinding shaft (3) and a rod body 2 (322) spherically connected to the rod body 1 (321). A return spring (323) is further connected between the rod body 1 (321) and the rod body 2 (322).

3. The grinding device for coating production according to claim 2, characterized in that: The filter disc (31) is provided with a plurality of filter holes (311), and the plurality of filter holes (311) are distributed in a plurality of concentric rings on the filter disc (31). A plurality of guide grooves (312) are provided on the filter disc (31) at a position close to the first-stage grinding chamber (21) and located at the filter holes (311). The opening direction of the guide grooves (312) is opposite to the rotation direction of the filter disc (31).

4. The grinding device for coating production according to claim 3, characterized in that: The grinding disc (33) is triangular in shape, and there is an angular deflection between two adjacent grinding discs (33). A plurality of grinding holes (331) are provided on the grinding disc (33).

5. The grinding device for coating production according to claim 4, characterized in that: A shell (6) is installed on the outside of the cylinder (2), and a cooling cavity is left between the shell (6) and the cylinder (2), and the cooling cavity is filled with cooling liquid.

6. The grinding device for coating production according to claim 5, characterized in that: The rod body 1 (321), the grinding disc (33) and the grinding shaft (3) are all connected by a key. A plurality of shaft sleeves 1 (34) are provided on the grinding shaft (3) in the first-level grinding chamber (21). The grinding rod (32) is located between two adjacent shaft sleeves 1 (34). A plurality of shaft sleeves 2 (35) are provided on the grinding shaft (3) in the second-level grinding chamber (22). The grinding disc (33) is located between two adjacent shaft sleeves 2 (35). An end shaft sleeve (36) is installed at the end of the grinding shaft (3). The end shaft sleeve (36) and the grinding shaft (3) are connected by a bolt (361).

7. The grinding device for coating production according to claim 6, characterized in that: A support sleeve (11) is mounted on the frame (1), and one end of the grinding shaft (3) away from the end sleeve (36) passes through the support sleeve (11).

8. The grinding device for coating production according to claim 7, characterized in that: A first material inlet (211) is provided in the first-stage grinding chamber (21) on the cylinder (2), a second material inlet (221) and a material outlet (222) are provided in the second-stage grinding chamber (22) on the cylinder (2), and a filter is provided at the material outlet (222).

9. The grinding device for coating production according to claim 8, characterized in that: The frame (1) is provided with a mounting platform (12), the mounting platform (12) is provided with a slide rail (13), the housing (6) is provided with a mounting frame (63), and the mounting frame (63) is rotatably connected to a roller (64) that can slide along the slide rail (13).

10. The grinding device for coating production according to claim 9, characterized in that: The driving mechanism (4) includes a driving motor (41) arranged on the frame (1), a synchronous belt (42) connected between the output shaft of the driving motor (41) and the grinding shaft (3), and a synchronous belt (43) connected between the grinding shaft (3) and the central shaft of the auger (51).

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