A vertical grinding machine for powder coating processing and working method

Abstract

The present invention relates to the field of coating production technology, and proposes a vertical mill for powder coating processing and a working method, wherein the vertical mill for powder coating processing includes a frame, a grinding shell is fixedly connected to the inside of the frame, a bracket is fixedly connected to the top surface of the grinding shell, the output shaft of the motor passes through the bracket downward and is fixedly sleeved with a first gear and a second gear, and a hollow column is rotatably installed inside the grinding shell. The present invention crushes the raw materials by the cooperation of the upper grinding head and the lower grinding head, and at the same time, during the rotation of the upper grinding head, the pressing plate will also rotate together, and the pressing plate will drive the cleaning head to move downward to clean up the accumulated crushed raw materials downward, thereby reducing the loss rate of the raw materials and the corrosion of the raw materials to the inner wall of the grinding shell. Through the above technical scheme, the problems of the prior art that the temperature of the grinding chamber rises after the equipment has worked for a long time, causing the properties of the raw materials to change, and the powder is easy to adhere to the inner wall of the grinding chamber are solved.

Description

Technical Field

[0001] The invention relates to the technical field of coating production, and in particular to a vertical grinding mill for powder coating processing and a working method thereof. Background Art

[0002] Powder coatings are mainly composed of solid resins, pigments, fillers and additives. Unlike traditional solvent-based coatings and water-based coatings, the dispersion medium of powder coatings is air, so it has the characteristics of no solvent pollution, 100% film formation, low energy consumption, etc. After film formation, the coating is flat and hard, which can meet the use requirements of multiple industries and has broad market prospects.

[0003] Powder coatings have a wide range of applications due to their environmentally friendly characteristics and excellent physical properties, which requires them to be prepared in large quantities. The preparation of powder coatings requires that the constituent materials be fully crushed and mixed so that there is no color difference on the surface of the workpiece after spraying. In the process of mass production of powder coatings, the heat accumulation caused by the continuous operation of the grinding head will cause the properties of the resin, pigment and additives ground by the grinding head to change, which will lead to the scrapping of the raw materials. The heat accumulation of the grinding head will also reduce the service life of the grinding head and cause equipment failures. At the same time, in the grinding process, because the ground powder particles are finer, they are easy to stick to the inner wall of the grinding chamber. During long-term production, as the temperature in the grinding chamber rises, the properties of the raw materials attached to the inner wall of the grinding chamber change, resulting in waste of raw materials. Summary of the invention

[0004] The invention provides a vertical mill for powder coating processing and a working method, which solves the problems in the related art that after the equipment works for a long time, the temperature of the grinding chamber rises, causing the raw material properties to change, and the powder is easy to adhere to the inner wall of the grinding chamber.

[0005] The technical solution of the present invention is as follows: A vertical grinding mill for powder coating processing comprises a frame, a grinding shell is fixedly connected inside the frame, a bracket is fixedly connected to the top surface of the grinding shell, a motor is fixedly connected to the upper surface of the bracket, an output shaft of the motor passes through the bracket downward and is fixedly sleeved with a first gear and a second gear, a hollow column is rotatably installed inside the grinding shell, a third gear is fixedly sleeved on the outer surface of the hollow column, a transmission gear is rotatably installed inside the bracket, a central column is rotatably installed at the center of the bracket, a fourth gear is fixedly sleeved on the outer surface of the central column, the third gear is meshed with the first gear, and the fourth gear is meshed with the first gear. The transmission gear is meshed with each other, and the transmission gear is also meshed with the second gear. The bottom end of the hollow column is fixedly connected to an upper grinding head, and the bottom end of the center column is fixedly connected to a lower grinding head. The center column is located inside the hollow column, and the upper grinding head is located above the lower grinding head and the centers of the two are on the same vertical line. A pressure plate is fixedly sleeved on the outer surface of the hollow column, and a support ring is fixedly connected to the inside of the grinding shell, and a plurality of connecting columns are slidably connected to the inside of the support ring. The upper end of the connecting column is fixedly connected to a sliding block, and the lower surface of the connecting column is fixedly linked to a cleaning head, and a first spring is elastically connected between the bottom surface of the sliding block and the top surface of the support ring.

[0006] Preferably, the lower end surface of the upper grinding head is fixedly connected with a plurality of centrally symmetrical first grinding blocks, the upper end surface of the lower grinding head is fixedly connected with a plurality of centrally symmetrical second grinding blocks, the upper surface of the lower grinding head is provided with a plurality of discharge grooves, and the lower surface of the upper grinding head is provided with a plurality of discharge notches, and the number of the discharge notches is the same as the number of the discharge grooves.

[0007] Preferably, the inner cavity of the hollow column is connected to the bottom surface of the upper grinding head, the bottom surface of the upper grinding head and the top surface of the lower grinding head are both inclined surfaces, the inclination angle of the bottom surface of the upper grinding head is greater than the inclination angle of the top surface of the lower grinding head, and the gap between the upper grinding head and the lower grinding head is a grinding cavity.

[0008] Preferably, a rotating joint is fixedly connected to the upper end of the center column, a through groove is opened inside the center column, an inner groove is opened inside the lower grinding head, the inner groove is the same as the through groove, the inner groove is communicated with the bottom surface of the lower grinding head, and a water outlet pipe is rotatably installed on the bottom surface of the lower grinding head, and the water outlet pipe penetrates the grinding shell.

[0009] Preferably, a hopper is fixedly connected to the upper surface of the bracket, and the discharge port of the hopper is located between the hollow column and the central column.

[0010] Preferably, a spiral blade is fixedly connected to the outer surface of the central column, the top of the spiral blade is located below the discharge port of the hopper, and the bottom of the spiral blade is located above the bottom surface of the upper grinding head.

[0011] Preferably, the discharge trough and the discharge notch are both arc-shaped, and when the discharge notch is located directly above the discharge trough, the discharge trough and the discharge notch together constitute a discharge channel, and the diameter of the discharge trough is equal to the maximum particle diameter of the raw material.

[0012] Preferably, the bottom surface of the pressing plate is provided with a rounded corner, the side surface of the sliding block is an inclined surface, and the outer side surface of the cleaning head abuts against the inner wall of the grinding shell.

[0013] Preferably, the bottom surface of the first grinding block abuts against the top surface of the lower grinding head, the second grinding block abuts against the bottom surface of the upper grinding head, and the side surfaces of the first grinding block and the second grinding block contact each other when they are in the same radial direction.

[0014] Preferably, the method comprises the following steps:

[0015] S1, start the motor to make the upper grinding head and the lower grinding head rotate in opposite directions;

[0016] S2, pouring the ground raw material from the hopper onto the upper surface of the lower grinding head;

[0017] S3, inject cooling water into the inner tank from the top rotary joint;

[0018] S4, receiving the powder coating falling from the bottom of the grinding shell.

[0019] The working principle and beneficial effects of the present invention are:

[0020] 1. The present invention cooperates with the upper grinding head and the lower grinding head, so that when the powder coating is fed into the grinding chamber between the two, the raw material is crushed as it collides and scrapes with the first grinding block and the second grinding block, and the raw material is mixed in the grinding chamber. When the crushed raw material falls into the discharge chute, it is thrown out of the grinding chamber as the lower grinding head rotates, hits the inner wall of the grinding shell, and finally leaves the equipment from the bottom discharge area of ​​the grinding shell. At the same time, during the rotation of the upper grinding head, the pressure plate on the outer surface of the hollow column fixedly connected thereto will also rotate together. During the rotation, the pressure plate will contact with different sliding blocks and push the sliding blocks to move downward, and finally drive the cleaning head to move downward. At this time, the cleaning head will clean up the crushed raw material accumulated on the inner wall of the grinding shell downward, reduce the loss rate of the raw material and the corrosion of the raw material to the inner wall of the grinding shell, and thus reduce the damage rate of the equipment.

[0021] 2. The spiral blades provided in the present invention ensure that after the raw materials are fed into the hollow column through the hopper, the raw materials will gradually move into the grinding chamber along the inclined surface of the spiral blades, preventing the raw materials from falling directly on the top surface of the upper grinding head and leaving dents on the upper grinding head, resulting in a decrease in grinding efficiency and extending the service life of the upper grinding head.

[0022] 3. In the present invention, by cooperating with the rotary joint, the inner tank and the water outlet pipe, cooling water is provided to the inner tank during the grinding process, so that the cooling water cools the lower grinding head, thereby preventing the raw materials from being scrapped due to changes in the properties of the raw materials caused by heat accumulation during long-term operation of the lower grinding head, thereby improving the yield rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the rear side structure of the present invention;

[0026] Figure 3 This is a cross-sectional structural diagram of the structural frame of the present invention;

[0027] Figure 4 For the present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0028] Figure 5 This is a schematic diagram of the internal structure of the grinding shell of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the upper grinding head of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the lower grinding head of the present invention;

[0031] Figure 8 is a cross-sectional view of the lower grinding head of the present invention;

[0032] Fig. 9 This is a cross-sectional view of the upper grinding head and the lower grinding head after they are matched with each other.

[0033] In the figure: 1. frame; 2. grinding shell; 3. bracket; 4. motor; 5. hopper; 6. rotary joint; 7. first gear; 8. second gear; 9. transmission gear; 10. hollow column; 11. upper grinding head; 12. first grinding block; 13. discharge notch; 14. third gear; 15. center column; 16. fourth gear; 17. spiral blade; 18. lower grinding head; 19. second grinding block; 20. discharge trough; 21. inner trough; 22. pressure plate; 23. support ring; 24. connecting column; 25. sliding block; 26. cleaning head; 27. first spring; 28. water outlet pipe. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 9 As shown, a vertical mill for powder coating processing of this embodiment includes a frame 1, a grinding shell 2 is fixedly connected inside the frame 1, a bracket 3 is fixedly connected to the top surface of the grinding shell 2, a motor 4 is fixedly connected to the upper surface of the bracket 3, an output shaft of the motor 4 passes through the bracket 3 downward and is fixedly sleeved with a first gear 7 and a second gear 8, a hollow column 10 is rotatably installed inside the grinding shell 2, a third gear 14 is fixedly sleeved on the outer surface of the hollow column 10, a transmission gear 9 is rotatably installed inside the bracket 3, a center column 15 is rotatably installed at the center of the bracket 3, a fourth gear 16 is fixedly sleeved on the outer surface of the center column 15, the third gear 14 is meshed with the first gear 7, and the fourth gear 16 is meshed with the transmission gear 9 They mesh with each other, and the transmission gear 9 also meshes with the second gear 8. The bottom end of the hollow column 10 is fixedly connected to the upper grinding head 11, and the bottom end of the center column 15 is fixedly connected to the lower grinding head 18. The center column 15 is located inside the hollow column 10, and the upper grinding head 11 is located above the lower grinding head 18, and the centers of the two circles are on the same vertical line. The outer surface of the hollow column 10 is fixedly sleeved with a pressure plate 22, and the interior of the grinding shell 2 is fixedly connected to a support ring 23, and the interior of the support ring 23 is slidably connected to multiple connecting columns 24, the upper end of the connecting column 24 is fixedly connected to a sliding block 25, and the lower surface of the connecting column 24 is fixedly linked to a cleaning head 26, and a first spring 27 is elastically connected between the bottom surface of the sliding block 25 and the top surface of the support ring 23.

[0036] The diameters of the first gear 7 and the second gear 8 are different, the diameter of the third gear 14 is different from the diameter of the fourth gear 16, and the transmission is transmitted through the transmission gear 9 between the second gear 8 and the fourth gear 16. When the motor 4 is started, it will drive the upper grinding head 11 and the lower grinding head 18 to rotate in opposite directions. At the same time, the rotation speeds of the two are also different. When the equipment is working, the first grinding block 12 and the second grinding block 19 also rotate in opposite directions, thereby improving the efficiency of crushing and grinding the raw materials. As the raw materials are ground to the required particle size, they fall into the discharge trough 20 and are thrown out of the area where the lower grinding head 18 is located after the discharge trough 20 and the discharge notch 13 are in the same radial direction, and hit the inner wall of the grinding shell 2, and finally leave the equipment from the discharge area at the bottom of the grinding shell 2.

[0037] After the ground material leaves the lower grinding head 18, part of the ground material will adhere to the inner wall of the grinding shell 2 due to impact. At this time, the pressing plate 22 rotates with the rotation of the hollow column 10, and the two ends of the pressing plate 22 contact the sliding block 25 and push the sliding block 25 to move downward, thereby causing the cleaning head 26 to move downward. At this time, the cleaning head 26 will scrape off the ground material attached to the inner wall of the grinding shell 2, thereby reducing the raw material loss caused by the raw material adhering to the grinding shell 2 and the corrosion of the grinding shell 2 by the raw material adhering to the inner wall of the grinding shell 2.

[0038] like Figures 6 to 9 As shown, the lower end surface of the upper grinding head 11 is fixedly connected with a plurality of centrally symmetrical first grinding blocks 12, the upper end surface of the lower grinding head 18 is fixedly connected with a plurality of centrally symmetrical second grinding blocks 19, the upper surface of the lower grinding head 18 is provided with a plurality of discharge grooves 20, and the lower surface of the upper grinding head 11 is provided with a plurality of discharge notches 13, and the number of the discharge notches 13 is the same as the number of the discharge grooves 20.

[0039] When the upper grinding head 11 and the lower grinding head 18 rotate in opposite directions, the raw materials between them collide with the first grinding block 12 and the second grinding block 19, so that the raw materials are gradually crushed. At the same time, the reverse rotation of the first grinding block 12 and the second grinding block 19 improves the crushing efficiency of the raw materials. The setting of the discharge trough 20 guides the crushed raw materials and also filters the crushed raw materials, so that only the crushed raw materials that meet the required particle size can leave the grinding chamber, so that the final product meets the particle size standard, thereby ensuring the surface quality of the paint surface after subsequent spraying.

[0040] like Figures 6 to 9 As shown, the inner cavity of the hollow column 10 is connected to the bottom surface of the upper grinding head 11, and the bottom surface of the upper grinding head 11 and the top surface of the lower grinding head 18 are both inclined surfaces. The inclination angle of the bottom surface of the upper grinding head 11 is greater than the inclination angle of the top surface of the lower grinding head 18, and the gap between the upper grinding head 11 and the lower grinding head 18 is a grinding cavity.

[0041] As the grinding chamber moves away from the axis of the central column 15, its height is also reduced, so that the ground material will be pushed by the first grinding block 12 and the second grinding block 19 according to its diameter. When the crushed material that meets the discharge diameter falls into the discharge trough 20, it will leave the grinding chamber as the lower grinding head 18 rotates, and then leave from the bottom discharge area of ​​the grinding shell 2. The above-mentioned structural coordination makes the powder particles produced by the device after grinding the raw materials uniform in size, prevents the paint surface from being uneven due to the uneven size of the powder coating particles, and improves the surface quality of the powder coating after molding.

[0042] like Figures 1 to 9 As shown, the upper end of the center column 15 is fixedly connected with a rotating joint 6, a through groove is opened inside the center column 15, and an inner groove 21 is opened inside the lower grinding head 18. The inner groove 21 is the same as the through groove. The inner groove 21 is communicated with the bottom surface of the lower grinding head 18, and a water outlet pipe 28 is rotatably installed on the bottom surface of the lower grinding head 18, and the water outlet pipe 28 penetrates the grinding shell 2.

[0043] When grinding the raw materials, as the equipment runs for a longer time, the upper grinding head 11 and the lower grinding head 18 will gradually accumulate heat due to friction, and the resin and pigment in the raw materials are materials that are sensitive to temperature. This causes the upper grinding head 11 and the lower grinding head 18 to accumulate heat and then heat up. Grinding the raw materials at this time will cause the properties of the raw materials themselves to change, and thus cause the quality of the powder coating finally produced to decrease. By providing cooling water into the inner tank 21 when the equipment is working, the heat generated by the upper grinding head 11 and the lower grinding head 18 during operation can be taken away by the cooling water, thereby ensuring the quality of the powder coating after grinding.

[0044] like Figures 1 to 9 As shown, a hopper 5 is fixedly connected to the upper surface of the bracket 3 , and a discharge port of the hopper 5 is located between the hollow column 10 and the central column 15 .

[0045] A spiral blade 17 is fixedly connected to the outer surface of the central column 15 . The top of the spiral blade 17 is located below the discharge port of the hopper 5 , and the bottom of the spiral blade 17 is located above the bottom surface of the upper grinding head 11 .

[0046] The hopper 5 is used to accurately feed the raw materials between the hollow column 10 and the center column 15, and the setting of the spiral blade 17 ensures that when the raw materials are fed from the hopper 5 into the hollow column 10, they will first fall onto the spiral blade 17, and then the raw materials will move into the grinding chamber as the lower grinding head 18 rotates. At this time, the raw materials are mixed during the movement, and during the grinding process, the raw materials will be further mixed, so that the various raw materials are evenly distributed in the finally ground powder, thereby improving the surface quality of the paint surface during subsequent spraying.

[0047] like Figures 1 to 9As shown, the discharge trough 20 and the discharge notch 13 are both arc-shaped, and when the discharge notch 13 is located directly above the discharge trough 20, the discharge trough 20 and the discharge notch 13 together constitute a discharge channel, and the diameter of the discharge trough 20 is equal to the maximum particle diameter of the raw material.

[0048] As the raw materials are ground in the grinding chamber, when the size of the ground particles is the same as or smaller than the diameter of the discharge trough 20, they are thrown out of the grinding chamber as the lower grinding head 18 rotates, and the discharge is finally completed. The discharge trough 20 filters the raw material particles, and only particles that meet the required diameter will leave the grinding chamber, thereby ensuring the quality of the paint surface after the spray head.

[0049] like Figures 3 to 5 As shown, the bottom surface of the pressing plate 22 is provided with a rounded corner, the side surface of the sliding block 25 is an inclined surface, and the outer side surface of the cleaning head 26 abuts against the inner wall of the grinding shell 2 .

[0050] As the pressing plate 22 rotates with the hollow column 10, it will contact different sliding blocks 25. When the rounded corners of the bottom edge of the pressing plate 22 contact the side of the sliding block 25, the sliding block 25 will be squeezed downward, causing the cleaning head 26 below to move downward, thereby allowing the cleaning head 26 to clean the inner wall of the grinding shell 2 to prevent the ground powder from solidifying on the inner wall of the grinding shell 2 and corroding it. At the same time, the cleaning head 26 also reduces the production loss of powder coating after cleaning.

[0051] like Figures 6 to 9 As shown, the bottom surface of the first grinding block 12 abuts against the top surface of the lower grinding head 18, and the second grinding block 19 abuts against the bottom surface of the upper grinding head 11. When the first grinding block 12 and the second grinding block 19 are in the same radial direction, their side surfaces contact each other.

[0052] The abutment between the grinding block and the grinding head serves to increase the contact area between the two, so that the water in the inner tank 21 can more effectively cool the upper grinding head 11 and the lower grinding head 18. When raw material particles fall into the discharge trough 20 and cause the discharge trough 20 to be blocked because their own diameter is slightly larger than the discharge trough 20, the first grinding block 12 abuts against the top surface of the lower grinding head 18 so that it can crush the blocked particles, thereby unblocking the discharge trough 20 and ensuring the discharge effect of the discharge trough 20.

[0053] Here’s how it works:

[0054] S1, start the motor 4 to make the upper grinding head 11 and the lower grinding head 18 rotate in opposite directions;

[0055] S2, pouring the ground material from the hopper 5 into the upper surface of the lower grinding head 18;

[0056] S3, inject cooling water into the inner tank 21 from the top rotary joint 6;

[0057] S4, receiving the powder coating dropped from the bottom of the grinding shell 2.

[0058] Working principle:

[0059] When using the present device for grinding, first pour the raw material from the hopper 5 into the hollow column 10, and then the raw material falls on the upper surface of the spiral blade 17, and then the motor 4 is turned on, the motor 4 drives the first gear 7 and the second gear 8 to rotate, and drives the hollow column 10 and the center column 15 to rotate through the transmission, at this time, the raw material will be sent into the grinding chamber with the rotation of the center column 15, and then the raw material is ground by the first grinding block 12 and the second grinding block 19. During the grinding process, cooling water is introduced into the rotary joint 6 so that the cooling water reduces the temperature of the upper grinding head 11 and the lower grinding head 18 to ensure that the raw material is stable during grinding. When the raw material is being ground, When the material reaches a size that meets the discharge size, it will be thrown out as the lower grinding head 18 rotates, and then leave from the discharge area below the grinding shell 2. When the material leaves the grinding chamber and hits the inner wall of the grinding shell 2, part of the material will adhere to the inner wall. As the hollow column 10 rotates, it will drive the pressure plate 22 to rotate. The rotation of the pressure plate 22 will cause the sliding block 25 in contact with it to move downward, thereby driving the cleaning head 26 connected to the sliding block 25 to move downward and scrape off the material attached to the inner wall. As the pressure plate 22 is no longer in contact with the sliding block 25, the sliding block 25 is pushed upward by the first spring 27, thereby resetting the cleaning head 26.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertical mill for powder coating processing, comprising a frame (1), characterized in that: A grinding shell (2) is fixedly connected inside the frame (1), a bracket (3) is fixedly connected to the top surface of the grinding shell (2), a motor (4) is fixedly connected to the upper surface of the bracket (3), an output shaft of the motor (4) passes through the bracket (3) downward and is fixedly sleeved with a first gear (7) and a second gear (8), a hollow column (10) is rotatably mounted inside the grinding shell (2), a third gear (14) is fixedly sleeved on the outer surface of the hollow column (10), a transmission gear (9) is rotatably mounted inside the bracket (3), a center column (15) is rotatably mounted at the center of the bracket (3), a fourth gear (16) is fixedly sleeved on the outer surface of the center column (15), the third gear (14) is meshed with the first gear (7), the fourth gear (16) is meshed with the transmission gear (9), and the transmission gear (9) is rotatably mounted on the outer surface of the central column (15). ) is also meshed with the second gear (8), the bottom end of the hollow column (10) is fixedly connected to an upper grinding head (11), the bottom end of the central column (15) is fixedly connected to a lower grinding head (18), the central column (15) is located inside the hollow column (10), the upper grinding head (11) is located above the lower grinding head (18) and the centers of the two are on the same vertical line, the outer surface of the hollow column (10) is fixedly sleeved with a pressure plate (22), the inside of the grinding shell (2) is fixedly connected to a support ring (23), the inside of the support ring (23) is slidably connected to a plurality of connecting columns (24), the upper end of the connecting column (24) is fixedly connected to a sliding block (25), the lower surface of the connecting column (24) is fixedly linked to a cleaning head (26), and a first spring (27) is elastically connected between the bottom surface of the sliding block (25) and the top surface of the support ring (23); The lower end surface of the upper grinding head (11) is fixedly connected to a plurality of centrally symmetrical first grinding blocks (12), the upper end surface of the lower grinding head (18) is fixedly connected to a plurality of centrally symmetrical second grinding blocks (19), the upper surface of the lower grinding head (18) is provided with a plurality of discharge grooves (20), the lower surface of the upper grinding head (11) is provided with a plurality of discharge notches (13), and the number of the discharge notches (13) is the same as the number of the discharge grooves (20); The inner cavity of the hollow column (10) is connected to the bottom surface of the upper grinding head (11); the bottom surface of the upper grinding head (11) and the top surface of the lower grinding head (18) are both inclined surfaces; the inclination angle of the bottom surface of the upper grinding head (11) is greater than the inclination angle of the top surface of the lower grinding head (18); and the gap between the upper grinding head (11) and the lower grinding head (18) is a grinding cavity; The upper end of the central column (15) is fixedly connected to a rotating joint (6), a through groove is provided inside the central column (15), an inner groove (21) is provided inside the lower grinding head (18), the inner groove (21) is the same as the through groove, the inner groove (21) is communicated with the bottom surface of the lower grinding head (18), a water outlet pipe (28) is rotatably mounted on the bottom surface of the lower grinding head (18), and the water outlet pipe (28) penetrates the grinding shell (2); A hopper (5) is fixedly connected to the upper surface of the bracket (3), and the discharge port of the hopper (5) is located between the hollow column (10) and the central column (15); A spiral blade (17) is fixedly connected to the outer surface of the central column (15), the top of the spiral blade (17) is located below the discharge port of the hopper (5), and the bottom of the spiral blade (17) is located above the bottom surface of the upper grinding head (11); The discharge groove (20) and the discharge notch (13) are both arc-shaped, and when the discharge notch (13) is located directly above the discharge groove (20), the discharge groove (20) and the discharge notch (13) together form a discharge channel, and the diameter of the discharge groove (20) is equal to the maximum particle diameter of the raw material; The bottom surface of the pressing plate (22) is provided with a rounded corner, the side surface of the sliding block (25) is an inclined surface, and the outer side surface of the cleaning head (26) abuts against the inner wall of the grinding shell (2).

2. A vertical mill for powder coating processing according to claim 1, characterized in that: The bottom surface of the first grinding block (12) abuts against the top surface of the lower grinding head (18), the second grinding block (19) abuts against the bottom surface of the upper grinding head (11), and the side surfaces of the first grinding block (12) and the second grinding block (19) contact each other when they are in the same radial direction.

3. A working method of a vertical mill for powder coating processing, applied to a vertical mill for powder coating processing according to claim 2, characterized in that: The steps include: S1, starting the motor (4) to cause the upper grinding head (11) and the lower grinding head (18) to rotate in opposite directions; S2, pouring the raw material to be ground from the hopper (5) onto the upper surface of the lower grinding head (18); S3, injecting cooling water into the inner tank (21) from the top rotary joint (6); S4, receiving the powder coating falling from the bottom of the grinding shell (2).

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