A grinding device and method for preparing water-based paint

Abstract

The present invention relates to the technical field related to grinding equipment, and discloses a grinding device and method for preparing water-based paint. In order to solve the problem that the quality of the ground paint cannot meet the use requirements due to the lack of a discharge detection link in the grinding equipment, the grinding disc is reciprocated up and down inside the grinding box to achieve multiple grinding of the water-based paint in the inner cavity of the grinding box, thereby ensuring the grinding quality of the water-based paint. When the water-based paint is ground, the output paint is filtered using a filter to ensure that the water-based paint output outside can fully meet the use requirements, and finally the effect of cyclic grinding and discharge filtration is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to grinding equipment, and in particular to a grinding device and method for preparing water-based coatings. Background Art

[0002] Water-based coatings use water as the dispersion medium (or solvent), with the film-forming substance (resin) dispersed in the water in the form of tiny particles or droplets. Compared to traditional solvent-based coatings, water-based coatings offer advantages in environmental friendliness and safety. Water-based coating grinding technology is a critical step in its production, directly impacting the coating's ultimate performance. To ensure the grinding quality of water-based coatings, multiple grinding cycles are typically required until the desired quality is achieved.

[0003] After searching, publication number CN214636723U proposed a grinding device for water-based paint production, including a liquid pump that pumps the water-based paint to be ground into a grinding mechanism, a liquid pushing mechanism that provides power to the water-based paint to prevent the water-based paint from piling up and affecting the grinding efficiency, and a grinding adjustment mechanism that adjusts the grinding mechanism to facilitate grinding of different water-based paints. The water-based paint is ground multiple times through the grinding mechanism to ensure that the water-based paint is fully ground.

[0004] The device uses multiple grinding mechanisms to grind water-based paint, which is continuously ground from top to bottom within the device. Although the number of grinding cycles increases, the design of multiple grinding mechanisms presents several issues: First, water-based paint can easily remain within the grinding mechanisms during the grinding process, creating dead corners and affecting the grinding effect. Second, the device lacks a filtration and detection system at the outlet, resulting in the paint potentially failing to meet usage requirements even after two grinding cycles. Therefore, it is necessary to develop a device that can facilitate repeated grinding of water-based paint and provide output quality filtration. Summary of the Invention

[0005] The present invention proposes a grinding device and method for preparing water-based paint. The device and method have the advantages of cyclic grinding and discharge filtration, and can solve the problem raised in the above background technology that the quality of the paint after two grindings still cannot meet the use requirements due to the lack of a discharge detection link.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a grinding device for preparing water-based coatings, comprising: a chassis, a controller installed on the side of the chassis, the controller being used to control the lifting and the up and down movement of the power assembly along the chassis, and at the same time controlling the rotation of the drive shaft; a grinding box, which is provided with a grinding chamber for placing raw materials, and a grinding disc installed on the drive shaft extends into the grinding chamber; when the grinding disc moves up and down in the grinding chamber, a pressure difference is generated between the grinding chamber and the external environment, and under the action of this pressure difference, the raw materials can quickly pass through the grinding area between the grinding disc and the grinding box.

[0007] Furthermore, an anti-overflow cavity is provided in the inner cavity of the grinding box and above the grinding cavity.

[0008] Furthermore, a filter screen and a discharge base for sealing the grinding chamber are installed at the bottom of the grinding box.

[0009] Furthermore, a reflux cylinder that moves axially along the drive shaft is fixed on the top of the grinding disc, and a reset push spring is connected between the reflux cylinder and the drive shaft; a cylindrical hole is axially passed through the middle of the reflux cylinder, and an axial flow fan blade located in the cylindrical hole is movably installed on the outside of the drive shaft; a piston disk that can seal the cylindrical hole in the reflux cylinder is fixedly installed on the bottom of the drive shaft.

[0010] Furthermore, a ventilation pipe movably mounted on the outer side of the drive shaft is provided on the top of the reflux cylinder.

[0011] Furthermore, a locking rod is movably installed on the side of the grinding disc and is pushed outward by a spring. A ring groove is provided on the outer side of the piston disc, and an inclined surface is provided on the bottom inner side of the grinding box.

[0012] Furthermore, a detection rod is movably installed on the top of the grinding box and extends into the bottom of the anti-overflow chamber. A hollow float that can float on the raw material is provided at the bottom of the detection rod; a detection socket is threadedly connected to the top of the grinding box and is sleeved on the top of the detection rod. When the detection rod moves downward to the limit, it touches the lower contact switch and serves as a signal to detect that there is no raw material in the anti-overflow chamber; when the detection rod moves upward to the limit, it touches the upper contact switch and serves as a signal that there is raw material in the anti-overflow chamber.

[0013] A grinding method for a grinding device for preparing a water-based coating comprises the following steps:

[0014] S1. Add water-based paint into the grinding chamber from the top of the grinding box.

[0015] S2. The controller is used to control the rotation of the drive shaft, and the water-based paint is ground according to the relative movement between the grinding disc and the inner side of the grinding box.

[0016] S3. When the grinding disc moves downward, since the bottom of the grinding box is in a blocked state during operation, the descending grinding disc squeezes the water-based paint in the grinding chamber, forcing the water-based paint below the grinding disc to flow upward from between the grinding disc and the grinding box, thereby grinding the water-based paint in the grinding chamber.

[0017] S4. When the grinding disc moves to the bottom, the driving shaft is driven upward by the lifting and power assembly, so that the environmental pressure of the grinding chamber below the grinding disc is reduced, causing the water-based paint above the grinding disc to flow downward between the grinding disc and the grinding box due to the pressure difference, completing the grinding of the water-based paint again.

[0018] The present invention has the following beneficial effects:

[0019] The present invention provides a grinding device and method for preparing water-based paint. The device uses a grinding disc to reciprocate up and down within a grinding box, repeatedly grinding the water-based paint within the grinding box to ensure the grinding quality of the water-based paint. After the water-based paint is ground, a filter provided at the discharge port filters the discharged paint, ensuring that the discharged water-based paint fully meets the requirements of use, ultimately achieving the effects of cyclic grinding and discharge filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] The present invention can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal three-dimensional cross-sectional structure of the grinding box of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal planar cross-sectional structure of the grinding box of the present invention;

[0025] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at E in the middle;

[0026] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at F in the middle;

[0027] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the reflux cylinder of the present invention;

[0028] Figure 7 This is a schematic diagram of the installation position and three-dimensional structure of the detection rod of the present invention;

[0029] Figure 8 This is a schematic diagram of the installation position and three-dimensional structure of the filter screen of the present invention;

[0030] Figure 9 This is a schematic diagram of the grinding process of the water-based coating of the present invention;

[0031] Figure 10 This is a schematic diagram of the movement state of the water-based paint after the grinding disc of the present invention moves to the bottom;

[0032] Figure 11 This is a schematic diagram of the water-based paint of the present invention being discharged outward.

[0033] In the figure: 1. Chassis; 2. Controller; 3. Lifting and power assembly; 4. Drive shaft; 5. Grinding box; 500. Grinding chamber; 501. Anti-overflow chamber; 6. Ventilation pipe; 600. Reset spring; 7. Return cylinder; 8. Axial fan blade; 9. Grinding disc; 10. Filter; 11. Unloading base; 12. Piston disc; 13. Locking rod; 14. Detection rod; 15. Detection socket; 150. Upper contact switch; 151. Lower contact switch. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] For example 1, please refer to Figure 1 It can be seen that the chassis 1 and the grinding box 5 in the present application are both fixed on a base plate with limiting holes, and the base plate can be installed and fixed in a desired position by using bolts.

[0036] In more detail, a controller 2 is installed on the side of the chassis 1. According to the program control of the controller 2, the lifting and power assembly 3 can move up and down along the chassis 1, and the output end of the lifting and power assembly 3 can drive the drive shaft 4 to rotate at high speed. Generally speaking, the lifting and power assembly 3 at the top of the chassis 1 mainly uses a servo motor to drive the screw to rotate, and cooperates with the threaded sleeve on the top of the chassis 1 to achieve precise and smooth up and down movement of the lifting and power assembly 3. However, it is not ruled out that hydraulic or pneumatic pressure can be used to achieve lifting. A motor and a gearbox are provided in the lifting and power assembly 3, and the motor is used to drive the gearbox to rotate, and it is connected to the drive shaft 4 according to the output end of the gearbox, so that the drive shaft 4 can rotate. The rotation speed of the drive shaft 4 can be controlled and adjusted by the controller 2.

[0037] Combine Figure 1 and Figure 2 It can be seen that the bottom plate has a grinding box 5 fastened with a clamp. The clamp is used to clamp the grinding box 5, so that the grinding box 5 is always in a vertical arrangement state, and the center axis of the grinding box 5 is aligned with the center axis of the drive shaft 4. A grinding chamber 500 is set in the inner cavity of the grinding box 5, and water-based paint can be input into the grinding chamber 500 from the opening at the top of the grinding box 5. Figure 2 As can be seen in the figure, a grinding disc 9 is mounted on the drive shaft 4 and extends into the grinding chamber 500. The water-based paint can be ground by the relative motion between the outer portion of the grinding disc 9 and the inner portion of the grinding box 5. To ensure the durability of the grinding box 5, a grinding sleeve is generally provided inside the grinding box 5 and within the grinding chamber 500. The relative motion between the grinding sleeve and the grinding disc 9 is used to grind the water-based paint.

[0038] In actual application, water-based paint is added into the grinding chamber 500 through the top port of the grinding box 5, and is controlled by the controller 2 to realize high-speed rotation of the drive shaft 4. The grinding of the water-based paint is realized through the relative movement between the grinding disc 9 and the inner side of the grinding box 5.

[0039] Not only that, if Figure 3 and Figure 9 As shown, when the grinding disc 9 moves downward, since the bottom of the grinding box 5 is in a blocked state during operation, the descending grinding disc 9 will squeeze the water-based paint in the grinding chamber 500, forcing the water-based paint below the grinding disc 9 to flow upward from between the grinding disc 9 and the grinding box 5, thereby achieving comprehensive grinding of the water-based paint in the grinding chamber 500.

[0040] Similarly, when the grinding disc 9 moves to the bottom, Figure 2 In the position shown, the driving shaft 4 is driven upward by the lifting and power assembly 3, which will reduce the environmental pressure of the grinding chamber 500 below the grinding disc 9, causing the water-based paint above the grinding disc 9 to flow downward from between the grinding disc 9 and the grinding box 5 due to the pressure difference, thereby completing the grinding of the water-based paint again.

[0041] On this basis, in order to prevent the coating in the grinding chamber 500 above the grinding disc 9 from overflowing during the upward movement of the grinding disc 9, Figure 2 and Figure 3 As can be seen in the figure, an overflow prevention chamber 501 is provided inside the grinding box 5 and above the grinding chamber 500. The overflow prevention chamber 501 is in communication with the grinding chamber 500 and is relatively larger than the grinding chamber 500. Due to the limited grinding gap between the grinding disc 9 and the inner side of the grinding box 5, when the grinding disc 9 moves upward, the water-based paint in the grinding chamber 500 can enter the overflow prevention chamber 501 for buffering, preventing the ascending grinding disc 9 from pushing out the water-based paint at the top of the grinding chamber 500.

[0042] And, from Figure 3 and Figure 8 As can be seen, a filter screen 10 is installed at the bottom of the grinding box 5, secured by cylindrical countersunk bolts. A removable discharge base 11 is also provided at the bottom of the grinding box 5. Under normal circumstances, the discharge base 11 is fixed to the bottom of the grinding box 5, thereby sealing the filter screen 10 and preventing the water-based paint in the grinding chamber 500 from being discharged. When the water-based paint in the grinding box 5 is ground, the discharge base 11 is opened, and the water-based paint is filtered through the filter screen 10, ensuring that the water-based paint discharged meets actual usage requirements.

[0043] The second embodiment is a further improvement on the first embodiment. Figure 2 、 Figure 3 and Figure 6 It can be seen that the reflux tube 7 can only move up and down along the axial direction of the drive shaft 4. In detail, the cross-sectional shape of the axial middle part of the reflux tube 7 is in the shape of a "T", and a cylindrical hole is axially passed through the middle part of the reflux tube 7, and the passed cylindrical hole can guide the flow of the water-based paint. The top of the reflux tube 7 is threadedly connected to the ventilation tube 6. There are multiple ventilation tubes 6. Three are taken as an example in this application. The top of the ventilation tube 6 passes through the limiting disk provided on the outer side of the drive shaft 4 and is threadedly connected to the anti-slip nut. A reset push spring 600 is arranged between the limiting disk on the drive shaft 4 and the top of the reflux tube 7 and is sleeved on the outer side of the ventilation tube 6. Affected by the elastic force of the reset push spring 600, the reflux tube 7 is forced to always have a tendency to move away from the limiting disk, that is, the reflux tube 7 always has a tendency to move downward. Combined with Figure 3 and Figure 5 It can be seen that a piston disc 12 is fixedly mounted at the bottom of the drive shaft 4, which is capable of sealing the cylindrical hole in the middle of the reflux tube 7. When the reflux tube 7 is forced to continue to move downward, the grinding disc 9 is fastened to the bottom of the reflux tube 7 by bolts, and the grinding disc 9 will simultaneously move downward and abut against the top of the piston disc 12. The piston disc 12 blocks the bottom of the grinding disc 9, thereby sealing the cylindrical hole at the bottom of the reflux tube 7. Axial flow blades 8 are movably mounted on the outside of the drive shaft 4, located in the cylindrical hole. When the drive shaft 4 drives the axial flow blades 8 to rotate, airflow from bottom to top occurs in the inner cavity of the reflux tube 7.

[0044] During application, the grinding disc 9 moves to the bottom of the grinding chamber 500. For safety reasons, in order to prevent direct collision between the grinding disc 9 and the bottom of the grinding box 5, a certain distance is generally reserved between the bottom of the grinding box 5 and the grinding disc 9. This space becomes a dead angle for the grinding disc 9 to grind. Some large particles of water-based paint that cannot be ground will settle at the bottom. This causes the large particles of water-based paint accumulated above the filter screen 10 to reduce the filtration efficiency when the water-based paint is subsequently filtered through the filter screen 10. Therefore, using the above-mentioned method, during the downward movement of the drive shaft 4, the reset push spring 600 is pushed to make the nut at the top of the ventilation pipe 6 push against the limiting disk outside the drive shaft 4. When the drive shaft 4 descends, the ventilation pipe 6 drives the reflux cylinder 7 and the grinding disc 9 to move downward synchronously. At this time, the piston disc 12 blocks the bottom of the grinding disc 9. The water-based paint below the grinding disc 9 and located in the grinding chamber 500 moves upward from the gap between the grinding disc 9 and the grinding box 5. When the water-based paint flows through the gap, the relative motion between the grinding disc 9 and the grinding box 5 is utilized to complete the grinding work.

[0045] As the grinding disc 9 continues to move downward, it will eventually contact the balls at the bottom of the grinding box 5. The balls will restrict the grinding disc 9, preventing it from moving downward. On the other hand, the balls will enable the grinding disc 9 to roll and connect with the bottom of the grinding box 5, reducing friction. Figure 3 、 Figure 4 and Figure 10 It can be seen that when the drive shaft 4 moves further downward, the grinding disc 9 is blocked, causing the piston disc 12 to move further downward and release the blockage on the bottom of the grinding disc 9. Afterwards, as the drive shaft 4 continues to rotate, the axial flow fan blades 8 rotate synchronously and generate an airflow from bottom to top in the cylindrical hole in the middle of the reflux cylinder 7. The water-based paint below the grinding disc 9 is sucked by the bottom of the reflux cylinder 7, so that the water-based paint below the grinding disc 9 is finally transported to the anti-overflow chamber 501. At the same time, the water-based paint above the grinding disc 9 will move from the gap between the grinding disc 9 and the grinding box 5 to the grinding chamber 500 below the grinding disc 9. As the water-based paint continues to flow in one direction, the water-based paint deposited below the grinding disc 9 is transported upward.

[0046] Finally, when the grinding disc 9 moves upward again, the water-based paint above the grinding disc 9 and located in the grinding chamber 500 can be ground again, and this cycle is repeated to achieve comprehensive circulation grinding of the water-based paint in the grinding chamber 500.

[0047] It should be noted that when the unloading base 11 is taken out and the filter screen 10 is used for filtering and outputting, if the filter screen 10 is blocked, the water-based paint in the grinding chamber 500 cannot be discharged normally. According to the above content, when the grinding disc 9 moves to the bottom and the piston disc 12 releases the blockage of the bottom of the grinding disc 9, the bottom of the reflux cylinder 7 sucks the area below. Combined with the fact that the unloading base 11 has been opened at this time, the external airflow will pass through the filter screen 10 quickly from bottom to top, and the airflow will be used to blow the filter holes in the filter screen 10 in the opposite direction at high speed, thereby transporting the water-based paint blocked in the filter screen 10 to the inside of the reflux cylinder 7, and finally moving it to the grinding chamber 500 to be ground and crushed again.

[0048] On this basis, in order to prevent the driving shaft 4 from driving the reflux cylinder 7 downward, the grinding disc 9 and the piston disc 12 from moving relative to each other due to the excessive pressure of the water-based paint in the grinding chamber 500, causing the bottom of the reflux cylinder 7 to open by mistake. Figure 3 、 Figure 5 and Figure 6 It can be seen that a locking rod 13 is movably installed on the side of the grinding disc 9 and is pushed outward by a spring. The locking rod 13 can only reciprocate along the radial direction of the grinding disc 9. Correspondingly, an annular groove is provided on the outer side of the piston disc 12. When the locking rod 13 reaches the annular groove, it can limit the upward and downward movement of the piston disc 12. At the same time, an inclined surface is provided on the inner bottom of the grinding box 5. Figure 5 As can be seen in the figure, when the grinding disc 9 descends to the bottom, the grinding disc 9 will abut against the ball bearings at the bottom inner side of the grinding box 5. At the same time, the locking rod 13 will extend outward along the inner inclined surface of the grinding box 5, thereby releasing the restriction on the piston disc 12. Similarly, when the drive shaft 4 moves upward, the reflux cylinder 7 is always pushed downward by the elastic force of the return spring 600. Therefore, only when the piston disc 12 ascends and abuts the bottom of the grinding disc 9 will the drive shaft 4 drive the grinding disc 9 to move upward. Afterwards, as the locking rod 13 moves upward along the inclined surface, the distance between the inner side of the grinding box 5 and the outer side of the grinding disc 9 shortens, causing the locking rod 13 to abut against the annular groove on the outer side of the piston disc 12. It can be seen that when the grinding disc 9 reciprocates up and down, the restriction of the locking rod 13 will prevent the piston disc 12 and the grinding disc 9 from accidentally detaching.

[0049] Example 3 is a supplement to Example 2. In actual application, after the grinding disc 9 moves up and down to the specified stroke, after it descends to the bottom, it is necessary to suck a certain amount of water-based paint under the grinding disc 9 to avoid accumulation of water-based paint; similarly, when the grinding disc 9 ascends, since the grinding disc 9 will push the water-based paint in the grinding chamber 500 into the anti-overflow chamber 501, there should be no water-based paint in the anti-overflow chamber 501 before the grinding disc 9 descends, so that the water-based paint can be fully ground. It is necessary to accurately limit when the grinding disc 9 descends to avoid the grinding disc 9 moving too early or too late, resulting in incomplete grinding / grinding time being too long.

[0050] from Figure 3 It can be seen that when the grinding disc 9 completely descends to the bottom, the outer side of the top of the reflux cylinder 7 is moved to the top of the grinding chamber 500 using a rubber sleeve, causing the grinding chamber 500 and the anti-overflow chamber 501 to be relatively blocked. At this time, the water-based paint transported through the cylindrical hole in the middle of the reflux cylinder 7 will accumulate in the anti-overflow chamber 501.

[0051] On this basis, combined with Figure 3 、 Figure 4 and Figure 7 It can be seen that a detection rod 14 is movably installed on the top of the grinding box 5 and extends into the bottom of the overflow prevention chamber 501. A hollow float is generally provided at the bottom of the detection rod 14, and the hollow float can float on the water-based paint. Under normal circumstances, since there is no water-based paint in the overflow prevention chamber 501, the bottom of the detection rod 14 will reach the bottom of the overflow prevention chamber 501. At this time, Figure 4 It can be seen that the top of the grinding box 5 is threadedly connected to a detection socket 15 that is sleeved on the top of the detection rod 14. The detection rod 14 that descends to its limit will touch the lower contact switch 151. The lower contact switch 151 is turned on and generates an electrical signal to send to the controller 2, which is used as a basis for detecting that there is no water-based paint in the anti-overflow chamber 501. Similarly, when the water-based paint in the anti-overflow chamber 501 increases, the hollow float at the bottom of the detection rod 14 moves upward due to buoyancy until the detection rod 14 touches the upper contact switch 150. The upper contact switch 150 can also be turned on and generate an electrical signal to send to the controller 2, thereby indicating that a certain amount of water-based paint has been stored in the anti-overflow chamber 501.

[0052] In actual application, the grinding of the water-based paint in the grinding chamber 500 during the up and down movement of the grinding disc 9 in this third embodiment is consistent with that described in the second and first embodiments above, and will not be repeated here.

[0053] When the grinding disc 9 descends to the bottom and the piston disc 12 releases the blockage on the bottom of the grinding disc 9, the drive shaft 4 will maintain this height and continue to rotate. As the axial flow fan blades 8 continue to rotate, the water-based paint under the grinding disc 9 will be continuously sucked and transported to the anti-overflow chamber 501. As the amount of water-based paint in the anti-overflow chamber 501 continues to increase, the hollow float at the bottom of the detection rod 14 will move upward. When the detection rod 14 touches the upper contact switch 150, the upper contact switch 150 inputs an electrical signal to the controller 2, and according to the control of the controller 2, the lifting and power assembly 3 drives the drive shaft 4 to move upward.

[0054] During the lifting and upward movement of the power assembly 3, the relative movement between the grinding disc 9 and the grinding box 5 is utilized to realize the grinding of the water-based paint in the grinding chamber 500. Since the gap between the grinding disc 9 and the grinding box 5 is limited, the water-based paint in the grinding chamber 500 will be pushed into the anti-overflow chamber 501 for buffering during the upward movement of the grinding disc 9.

[0055] When the grinding disc 9 reaches the top, Figure 11 In the shown position, at this moment, the top of grinding disc 9 is aligned with the bottom surface of anti-overflow chamber 501, but because there is still water-based paint in anti-overflow chamber 501, drive shaft 4 can maintain this height and rotate continuously. As the water-based paint in anti-overflow chamber 501 causes pressure reduction in grinding chamber 500 when gravity affects and grinding disc 9 ascends, the water-based paint in anti-overflow chamber 501 is forced to flow into grinding chamber 500. As the water-based paint in anti-overflow chamber 501 continuously reduces, the height of detection rod 14 is continuously lowered. When detection rod 14 moves to the bottom of anti-overflow chamber 501, it is explained that the water-based paint in anti-overflow chamber 501 flows into grinding chamber 500 completely. Detection rod 14 will also touch lower contact switch 151, and lower contact switch 151 generates an electrical signal and is transmitted to controller 2, and controller 2 is utilized to move the grinding disc 9 that has arrived at the top of grinding chamber 500 downward again, so circulates, and guarantees that the water-based paint in grinding chamber 500 can be ground comprehensively.

[0056] Finally, when the grinding is complete, combine Figure 3 and Figure 11 As shown, after the grinding disc 9 ascends to the top, the unloading base 11 is opened. At this time, the descending grinding disc 9 will squeeze the grinding chamber 500. After the medium pressure in the grinding chamber 500 increases, the water-based paint will be forced to be discharged quickly from the filter 10.

[0057] If the filter 10 becomes clogged during the filtration process, the grinding disc 9 will eventually descend to the top, and after the piston disc 12 is opened, the axial flow fan blades 8 rotate to suck air from under the grinding disc 9, and the outside air flows in the opposite direction from the filter 10 to clear the blockage. At the same time, when the water-based paint in the grinding chamber 500 enters under the grinding disc 9, it is also sucked upward by the bottom of the grinding disc 9. The water-based paint and the filtered large-particle paint are transported to the overflow prevention chamber 501 again. After the total amount of water-based paint in the overflow prevention chamber 501 increases, the above-mentioned method is realized again, and the water-based paint in the overflow prevention chamber 501 is ground again by the upward movement of the grinding disc 9.

[0058] It should be noted that when the grinding disc 9 continues to rotate downward and does not move upward for a long time, it means that the paint in the grinding chamber 500 is completely discharged or there is little paint left. Figure 1 It can be seen that a vertical window mirror is provided on the side of the grinding box 5 and in the area of ​​the clamp connection part. The operator can check the actual height of the water-based paint inside the grinding box 5 based on this part, and thus use manual adjustment to ensure that the water-based paint in the grinding box 5 can be completely discharged outward.

Claims

1. A grinding device for preparing water-based coatings, characterized in that: include: A chassis (1) is provided with a controller (2) mounted on a side of the chassis (1), the controller (2) being used to control the lifting and the upward and downward movement of the power assembly (3) along the chassis (1), and simultaneously controlling the rotation of the drive shaft (4); A grinding box (5) is provided with a grinding chamber (500) for placing raw materials therein, and a grinding disc (9) mounted on a drive shaft (4) extends into the grinding chamber (500); When the grinding disc (9) moves up and down in the grinding chamber (500), a pressure difference is generated between the grinding chamber (500) and the external environment. Under the action of this pressure difference, the raw material can quickly pass through the grinding area between the grinding disc (9) and the grinding box (5); An anti-overflow cavity (501) is provided in the inner cavity of the grinding box (5) and above the grinding cavity (500); A reflux cylinder (7) is fixed on the top of the grinding disc (9) and moves axially along the drive shaft (4), and a reset spring (600) is connected between the reflux cylinder (7) and the drive shaft (4); A cylindrical hole is axially passed through the middle of the return cylinder (7), and an axial flow fan blade (8) located in the cylindrical hole is movably mounted on the outer side of the drive shaft (4); A piston disc (12) is fixedly mounted on the bottom of the drive shaft (4) and is capable of sealing the cylindrical hole in the reflux cylinder (7); A ventilation pipe (6) is provided on the top of the reflux cylinder (7) and is movably mounted on the outside of the drive shaft (4); A detection rod (14) extending into the bottom of the anti-overflow chamber (501) is movably installed on the top of the grinding box (5), and a hollow float capable of floating on the raw material is provided at the bottom of the detection rod (14); The top of the grinding box (5) is threadedly connected to a detection socket (15) sleeved on the top of the detection rod (14). When the detection rod (14) moves downward to the limit, it touches the lower contact switch (151) and serves as a signal to detect that there is no raw material in the overflow prevention chamber (501); when the detection rod (14) moves upward to the limit, it touches the upper contact switch (150) and serves as a signal to detect that there is raw material in the overflow prevention chamber (501).

2. The grinding device for preparing water-based coating according to claim 1, characterized in that: A filter screen (10) and a discharge base (11) for sealing the grinding chamber (500) are installed at the bottom of the grinding box (5).

3. The grinding device for preparing water-based coating according to claim 1, characterized in that, A locking rod (13) is movably mounted on the side of the grinding disc (9) and is pushed outward by a spring. An annular groove is provided on the outer side of the piston disc (12). An inclined surface is provided on the inner bottom of the grinding box (5).

4. A grinding method for preparing a water-based coating according to claim 1, characterized in that: The following steps are involved: S1, adding water-based paint from the top of the grinding box (5) into the grinding chamber (500); S2, using the controller (2) to control the driving shaft (4) to rotate, and grinding the water-based paint according to the relative movement between the grinding disc (9) and the inner side of the grinding box (5); S3, when the grinding disc (9) moves downward, since the bottom of the grinding box (5) is in a blocked state during operation, the descending grinding disc (9) squeezes the water-based paint in the grinding chamber (500), so that the water-based paint below the grinding disc (9) is forced to flow upward from between the grinding disc (9) and the grinding box (5), thereby grinding the water-based paint in the grinding chamber (500); S4. When the grinding disc (9) moves to the bottom, the driving shaft (4) is driven upward by the lifting and power assembly (3), so that the ambient pressure of the grinding chamber (500) below the grinding disc (9) is reduced, causing the water-based paint above the grinding disc (9) to flow downward from the grinding disc (9) and the grinding box (5) under the influence of the pressure difference, thereby completing the grinding of the water-based paint again.

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