Grinding device for powder coating production

Abstract

The invention discloses a powder grinding device for powder coating production, and relates to the field of coating production, the powder grinding device comprises a shell and a grinding disc rotationally arranged in the shell, the shell is further provided with a power assembly used for driving the grinding disc to rotate, and the shell is provided with a passive extrusion mechanism; when the power assembly drives the millstone to rotate, the passive extrusion mechanism drives the millstone to vertically ascend and descend. According to the grinding device for powder coating production, when the power assembly drives the grinding disc to rotate, the passive extrusion mechanism drives the grinding disc to vertically ascend and descend, due to the fact that the vertical height of the grinding roller is not changed, when the grinding disc descends, a gap between the grinding roller and the grinding disc is enlarged, and at the moment, a large piece of coating can enter the gap; when the grinding roller rotates, the gap between the grinding disc and the grinding roller becomes smaller, and in the process, extrusion force is generated on the large coating, so that the large coating is crushed, and the grinding efficiency of the large coating is improved.

Description

Technical Field

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

[0002] As is known, powder coating is a solvent-free coating, mainly composed of resin, pigment, filler and additives. It exists in powder form during the coating process, and after spraying, it solidifies at high temperature to form a solid coating. It has the advantages of environmental protection, high efficiency and durability. Its production includes extrusion, drying, crushing and grinding.

[0003] For example, the Chinese patent document with the authorization announcement number CN221413320U, the announcement date 2024-07-26, and the name "A vertical mill for powder coatings" includes: a body with a multi-wheel powder selector, a cone bucket, a spiral feeder, a machine base, an active motor, a reducer and a hydraulic rod; a plurality of grinding rollers, and the plurality of grinding rollers are arranged in the body; a grinding disc, the grinding disc is arranged in the body, and the grinding disc is located at the bottom of the plurality of grinding rollers; a cooling box, the cooling box is arranged in the grinding disc; a cooling component, the cooling component is arranged in the cooling box, and the cooling component is used to reduce the temperature of the grinding environment. The vertical mill for powder coatings provided by the utility model has the advantage of being able to cool the powder grinding disc environment to prevent the danger caused by excessively high ambient temperature, thereby having a higher safety.

[0004] The disadvantage of the above-mentioned prior art is that the distance between the grinding roller and the grinding disc is fixed, which means that the gap between the two will not change. When grinding the paint, large pieces of paint cannot directly enter the gap between the grinding roller and the grinding disc, and the large pieces of paint can only be crushed by friction and shear force. Summary of the invention

[0005] The object of the present invention is to provide a powder grinding device for producing powder coatings to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A powder grinding device for powder coating production, comprising a housing and a grinding disc rotatably arranged inside the housing, the housing is also provided with a power assembly for driving the grinding disc to rotate, and the housing is provided with a passive extrusion mechanism;

[0008] When the power assembly drives the grinding disc to rotate, the passive extrusion mechanism drives the grinding disc to rise and fall vertically.

[0009] In the above-mentioned grinding device for powder coating production, the passive extrusion mechanism includes a first driving groove opened on the inner wall of the shell, and a first driving rod adapted to the first driving groove is fixedly connected to the grinding disc, and the first driving rod is slidably connected to the first driving groove.

[0010] The above-mentioned grinding device for powder coating production, the power assembly includes a power shaft, the grinding disc is provided with a connecting shaft, the power shaft is slidably connected to the connecting shaft;

[0011] A limiting component is provided between the power shaft and the connecting shaft to prevent relative rotation between the power shaft and the connecting shaft.

[0012] The grinding device for powder coating production is provided with an alternating feeding mechanism for allowing large pieces of coating and small pieces of coating to enter the grinding disc at intervals.

[0013] The above-mentioned grinding device for powder coating production, the alternating feeding mechanism includes a transfer frame, a limit rod is provided between the transfer frame and the grinding disc, and a retaining ring is slidably provided on the limit rod;

[0014] It also includes a sieve plate that matches the size of the retaining ring, and the sieve plate is fixed to the limiting rod;

[0015] The retaining ring has a first position for allowing large pieces of paint to enter the grinding disc and a second position for allowing small pieces of paint to enter the grinding disc.

[0016] In the above-mentioned grinding device for powder coating production, when the first driving rod is located at the highest point of the first driving groove, the retaining ring is in the first position, and when the first driving rod is located at the lowest point of the first driving groove, the retaining ring is in the second position.

[0017] The above-mentioned grinding device for powder coating production, the power shaft is provided with a transmission plate, the retaining ring is provided with a connecting rod, the connecting rod passes through the grinding disc and is fixedly connected to the transmission plate;

[0018] The inner wall of the shell is provided with a second driving groove, and a second driving rod matched with the second driving groove is fixedly connected to the transmission plate, and the second driving rod is slidably connected with the second driving groove.

[0019] In the above-mentioned grinding device for powder coating production, the first driving groove is provided with a first horizontal section, and the second driving groove is provided with a second horizontal section, and the positions of the first horizontal section and the second horizontal section are arranged correspondingly.

[0020] In the above-mentioned grinding device for powder coating production, the retaining ring is provided with an escape portion.

[0021] In the above-mentioned grinding device for powder coating production, a stroke amplification component is arranged between the grinding disc and the transmission plate.

[0022] In the above technical scheme, the grinding device for powder coating production provided by the present invention is provided with a passive extrusion mechanism. While the power component drives the grinding disc to rotate, the passive extrusion mechanism drives the grinding disc to rise and fall vertically. Since the vertical height of the grinding roller is unchanged, when the passive extrusion drives the grinding disc to descend, the gap between the grinding roller and the grinding disc becomes larger. At this time, large pieces of coating will enter the gap. When the grinding disc moves up, the gap between the grinding disc and the grinding roller will become smaller. In this process, an extrusion force will be generated on the large pieces of coating, so that the large pieces of coating are broken, thereby accelerating the grinding efficiency of the large pieces of coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of a partial cross-sectional structure of the interior of a housing provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the overall structure of a grinding disc and a transmission plate provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the inner wall structure of a housing provided by another embodiment of the present invention;

[0027] Figure 4 for Figure 2 A schematic cross-sectional structural diagram of

[0028] Figure 5 An exploded schematic diagram of a sieve plate and a retaining ring provided in yet another embodiment of the present invention;

[0029] Figure 6 for Figure 4 A schematic diagram of the enlarged local structure at center A;

[0030] Figure 7 for Figure 4 Enlarged schematic diagram of the local structure at point B in the middle.

[0031] Description of reference numerals:

[0032] 1. Shell; 2. Grinding disc; 3. Grinding chamber; 4. Grinding roller; 5. First driving groove; 6. First driving rod; 7. Power shaft; 8. Connecting shaft; 9. First limiting block; 10. First limiting groove; 11. Transfer rack; 12. Limiting rod; 13. Retaining ring; 14. Sieve disc; 15. Transmission plate; 1501. Inner ring; 1502. Outer ring; 16. Connecting rod; 17. Second driving groove; 18. Second driving rod; 19. First horizontal section; 20. Second horizontal section; 21. Avoidance part; 22. Gear; 23. Bracket; 24. First tooth plate; 25. Second tooth plate; 26. Second limiting block; 27. Second limiting groove. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] In the description of the present invention, it is to be understood that Figure 4 The position of the middle grinding disc 2 relative to the power 7 is up, and vice versa. This orientation is also the orientation of the grinding device during daily use. The orientations or positional relationships indicated by the terms "center", "length", "width", "degree", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0035] Reference Figure 1-7 The grinding device for powder coating production provided in an embodiment of the present invention comprises a shell 1 and a grinding disc 2 rotatably arranged inside the shell 1, the shell 1 is also provided with a power component for driving the grinding disc 2 to rotate, and the shell 1 is provided with a passive extrusion mechanism; when the power component drives the grinding disc 2 to rotate, the passive extrusion mechanism drives the grinding disc 2 to rise and fall vertically.

[0036] Specifically, the shell 1 is a cylindrical structure with a hollow interior, and the hollow area inside is the grinding chamber 3, and a feed port is provided through the side wall of the grinding chamber 3, the grinding disc 2 is arranged inside the shell 1, and near the bottom end of the shell 1, a grinding roller 4 is arranged on the inner side wall of the shell 1, and the grinding roller 4 is preferably two, which are symmetrically arranged above the grinding disc 2 and near the edge of the grinding roller 4, and a powder selection mechanism is arranged inside the shell 1, and the powder selection mechanism includes a fan and a grading structure, the grading structure is arranged on the inner top wall of the shell 1, and the shell 1 is provided with a powder outlet connected to the grading structure, and the grinding disc 2 and the shell 1 are both provided with openings or holes (not shown). When grinding the paint, the fan can blow an ascending airflow into the grinding chamber 3 through the opening or hole, and then add paint to the grinding chamber 3 from the feed port. Under the action of the centrifugal force provided by the grinding disc 2, the paint will move to the edge of the grinding disc 2, so as to contact with the grinding roller 4 for grinding. This is the prior art and will not be elaborated on. One of the core innovations of the embodiment of the present invention is that a passive extrusion mechanism is provided. The passive extrusion mechanism can be a reciprocating drive component such as an oil cylinder, which drives the grinding disc 2 to rise and fall by controlling the extension and retraction of the output end of the oil cylinder. The power component can be an existing structure for providing rotational force such as a hydraulic motor. The effect of such a setting is that while the power component drives the grinding disc 2 to rotate, the passive extrusion mechanism drives the grinding disc 2 to rise and fall vertically. Since the vertical height of the grinding roller 4 is unchanged, when the passive extrusion drives the grinding disc 2 to descend, the gap between the grinding roller 4 and the grinding disc 2 becomes larger. At this time, large pieces of paint will enter the gap. When the grinding disc 2 moves up, the gap between the grinding disc 2 and the grinding roller 4 becomes smaller. In this process, an extrusion force is generated on the large pieces of paint, so that the large pieces of paint are broken. After the large pieces of material are broken, they will become powder under the subsequent grinding action of the grinding roller 4, thereby accelerating the grinding efficiency of the large pieces of paint.

[0037] As an alternative to the above-mentioned oil cylinder driving the grinding disc 2 to vertically lift and lower, preferably, the passive extrusion mechanism includes a first driving groove 5 opened on the inner wall of the shell 1, and a first driving rod 6 adapted to the first driving groove 5 is fixedly connected to the grinding disc 2, and the first driving rod 6 is slidably connected to the first driving groove 5. Specifically, the first driving rod 6 is preferably a cylindrical rod, and there are preferably two first driving rods 6, the two first driving rods 6 are symmetrically arranged about the grinding disc 2, the first driving groove 5 is arranged along the inner circumference of the shell 1, and the first driving groove 5 is preferably wavy, that is, the first driving groove 5 has multiple highest points and multiple lowest points, the number of the highest points and the lowest points is an even number, and the positions of the highest points and the lowest points are symmetrically arranged about the central axis of the shell 1, that is, the heights of the two first driving rods 6 are always consistent. The effect of such a setting is that when the grinding disc 2 rotates inside the shell 1, the first driving rod 6 will slide inside the first driving groove 5. As far as the first driving rod 6 is at the lowest point of the first driving groove 5, the grinding disc 2 is at the highest point at this time. At this time, the gap between the grinding disc 2 and the grinding roller 4 is the smallest, which is convenient for grinding small pieces of paint. When the first driving rod 6 slides from the lowest point of the first driving groove 5 to the highest point of the first driving groove 5, the overall height of the grinding disc 2 will move down, so that large pieces of paint can enter between the grinding roller 4 and the grinding disc 2. When the first driving rod 6 slides from the highest point of the first driving groove 5 to the lowest point of the first driving groove 5, the grinding disc 2 will move up. In this way, the passive lifting of the grinding disc 2 can be realized to passively extrude large pieces of paint.

[0038] In order to ensure that the kinetic energy of the power assembly can always be transmitted to the grinding disc 2 during the lifting and lowering of the grinding disc 2, preferably, the power assembly includes a power shaft 7, a connecting shaft 8 is provided on the grinding disc 2, and the power shaft 7 is slidably connected to the connecting shaft 8; and a limiting assembly is provided between the power shaft 7 and the connecting shaft 8 for preventing relative rotation between the power shaft 7 and the connecting shaft 8. Specifically, a connecting groove is opened inside the power shaft 7, and the connecting shaft 8 is plugged into the connecting groove. The limiting assembly includes a first elongated limiting block 9 and a first elongated limiting groove 10. The first limiting block 9 is slidably connected to the first limiting groove 10, and the length of the overlapping part of the first limiting block 9 and the first limiting groove 10 is greater than the height difference between the highest point and the lowest point of the first driving groove 5. The purpose of such a setting is that during the plugging of the connecting shaft 8 and the connecting groove, the first limiting block 9 is also inserted into the first limiting groove 10. When the power shaft 7 rotates, under the action of the first limiting block 9 and the first limiting groove 10, the connecting shaft 8 and the grinding disc 2 will be driven to rotate synchronously to realize the transmission of kinetic energy. When the first driving rod 6 and the first driving groove 5 slide to drive the grinding disc 2 to rise and fall, the connecting shaft 8 will float up and down inside the connecting groove to adapt to the axial distance generated between the connecting shaft 8 and the power shaft 7 when the grinding disc 2 is lifted and lowered.

[0039] It should be noted that when feeding the grinding chamber 3, the paint is transported to the center of the grinding disc 2 through an inclined slide, and then the centrifugal force generated by the rotation of the grinding disc 2 causes the paint to be thrown from the edge of the grinding disc 2 for grinding. Since the paint is fed through the feeding auger, large pieces of paint and small pieces of paint are added to the grinding disc 2 simultaneously. According to the formula of centrifugal force (centrifugal force = mass * square of linear velocity / rotation radius), large pieces of material are subjected to greater centrifugal force, so there will be more large pieces of paint at the edge of the grinding disc 2 than small pieces of paint, and the size of the paint will gradually increase from the direction away from the central axis of the grinding disc 2. In this way, when the paint is added normally, small pieces of paint are prone to accumulation near the central axis of the grinding disc 2. Furthermore, the grinding disc 2 is provided with an alternating feeding mechanism for allowing large pieces of paint and small pieces of paint to enter the grinding disc 2 at intervals. Specifically, the alternating delivery mechanism can be two channels connected to the slide, and the paint is graded into large pieces of paint and small pieces of paint through structures such as screens. The large pieces of paint and the small pieces of paint are placed in two channels respectively, and the outlets of the two channels can be controlled to open and close by structures such as baffles. When adding materials, the outlets of the two channels are opened alternately to achieve alternating delivery of large pieces of paint and small pieces of paint, so that the grinding roller 4 can alternately grind the large pieces of paint and the small pieces of paint.

[0040] As another embodiment of the present invention, the alternating feeding mechanism includes a transfer frame 11, a limiting rod 12 is arranged between the transfer frame 11 and the grinding disc 2, and a retaining ring 13 is slidably arranged on the limiting rod 12; it also includes a sieve plate 14 that is adapted to the size of the retaining ring 13, and the sieve plate 14 is fixed to the limiting rod 12; the retaining ring 13 has a first position for allowing large pieces of paint to enter the grinding disc 2 and a second position for allowing small pieces of paint to enter the grinding disc 2. Specifically, the transfer frame 11 is annular, which is mounted above the grinding disc 2 through a limiting rod 12 and is coaxially arranged with the grinding disc 2. There are preferably four limiting rods 12, and there is space between the four limiting rods 12 for the paint to pass through. The retaining ring 13 is also annular, and its axial length is 1 / 2 of the length of the limiting rod 12. The inner wall of the retaining ring 13 is provided with an arc groove that matches the limiting rod 12, so that the retaining ring 13 can slide vertically along the limiting rod 12. The radial size of the sieve plate 14 is matched with the inner diameter size of the retaining ring 13, and the grinding disc 2 is fixedly connected to the inner side of the four limiting rods 12. When the grinding disc 2 is in the first position, the retaining ring 13 is located below the sieve disc 14, and when the grinding disc 2 is in the second position, the retaining ring 13 is located above the sieve disc 14. The effect of such a setting is that when the paint is loaded, it will enter the transfer rack 11 through the slideway. Under the screening effect of the sieve disc 14, small pieces of paint will fall below the sieve disc 14 through the sieve holes, while large pieces of paint will be blocked above the sieve disc 14 to achieve the screening effect of the paint, and then the retaining ring 13 is driven to reciprocate between the first position and the second position by the existing reciprocating drive components such as the electric push rod. The first driving rod 6 is moved to realize the alternating delivery of coatings of different sizes, and as a preferred embodiment, when the first driving rod 6 is located at the highest point of the first driving groove 5 (that is, the grinding disc 2 is at the lowest point at this time, and the gap between the grinding roller 4 and the grinding disc 2 is at the maximum value), the retaining ring 13 is controlled to be in the first position, and the large pieces of coating above the sieve plate 14 will be discharged from the top of the sieve plate 14 and enter between the grinding roller 4 and the grinding disc 2. When the first driving rod 6 is located at the lowest point of the first driving groove 5 (that is, the grinding disc 2 is at the highest point at this time, and the gap between the grinding roller 4 and the grinding disc 2 is at the minimum value), the retaining ring 13 is controlled to be in the first position. The ring 13 is in the second position, at this time, the small pieces of paint under the sieve plate 14 will be discharged from the bottom of the sieve plate 14 and enter between the grinding roller 4 and the grinding disc 2. The advantages brought by this are, first, by controlling the movement of the retaining ring 13, the alternating delivery of paints of different sizes can be achieved; second, when the grinding disc 2 moves up and down, a shaking effect will be produced on the sieve plate 14 to improve the screening efficiency of the sieve plate 14; third, when the grinding disc 2 moves down, large pieces of paint are delivered into the large gap, and when the grinding disc 2 moves up, small pieces of paint are delivered into the small gap to achieve targeted grinding of paints of different sizes.

[0041] As an alternative solution for the above-mentioned electric push rod to drive the retaining ring 13 to switch back and forth between the first positions, a transmission plate 15 is provided on the power shaft 7, and a connecting rod 16 is provided on the retaining ring 13, and the connecting rod 16 passes through the grinding disc 2 and is fixedly connected to the transmission plate 15; a second driving groove 17 is provided on the inner wall of the shell 1, and a second driving rod 18 adapted to the second driving groove 17 is fixedly connected to the transmission plate 15, and the second driving rod 18 is slidably connected to the second driving groove 17. Specifically, the transmission plate 15 is fixedly connected to the outer circumference of the power shaft 7, and preferably four connecting rods 16 are fixedly connected. One end of the connecting rod 16 is fixedly connected to the bottom end of the retaining ring 13, and the other end passes through the grinding disc 2 and is fixed to the upper surface of the transmission plate 15. The second driving groove 17 is also a wave groove, and the highest point and the lowest point of the second driving groove 17 are arranged corresponding to the positions of the highest point and the lowest point of the first driving groove 5, respectively, and the height difference between the highest point and the lowest point of the second driving groove 17 is greater than twice the height difference between the highest point and the lowest point of the first driving groove 5. The effect of such a setting is that when grinding large pieces of paint, the retaining ring 13 is in the second position, that is, at this time the retaining ring 13 is located below the sieve plate 14. When the grinding disc 2 moves up, under the action of the limit rod 12, the sieve plate 14 and the intermediate transfer frame 11 will be driven to move upward. Since the retaining ring 13 is fixedly connected to the transmission plate 15 through the connecting rod 16, and the transmission Under the action of the second driving rod 18 connected with the second driving groove 17, the plate 15 will also move upward. Since the height difference between the highest point and the lowest point of the second driving groove 17 is greater than twice the height difference between the highest point and the lowest point of the first driving groove 5, the upward movement distance of the transmission plate 15 and the retaining ring 13 will also be greater than twice the upward movement distance of the sieve plate 14, that is, the retaining ring 13 will move upward relative to the sieve plate 14, thereby blocking the space above the sieve plate 14 and simultaneously opening the space below the sieve plate 14 to enable the delivery of small pieces of paint, that is, the above process enables the retaining ring 13 to passively switch from the first position to the second position. Conversely, when the grinding disc 2 moves downward, the downward movement of the transmission plate 15 will cause the retaining ring 13 to move downward relative to the sieve plate 14, so as to achieve the passive switching of the retaining ring 13 from the second position to the first position, thereby achieving the passive switching of the grinding disc 2 between the first position and the second position.

[0042] In order to allow the retaining ring 13 to remain in the first position or the second position for a period of time and to drain the paint above or below the sieve plate 14 before switching the position, further, a first horizontal section 19 is provided on the first driving groove 5, and a second horizontal section 20 is provided on the second driving groove 17, and the positions of the first horizontal section 19 and the second horizontal section 20 are arranged correspondingly. Specifically, the first horizontal section 19 has multiple sections, which are connected to the highest point or the lowest point of the first driving groove 5. The purpose of such a setting is that when the first driving rod 6 is at the highest point of the first driving groove 5, the second driving rod 18 is also at the highest point of the second driving groove 17. At this time, the retaining ring 13 is in the first position. During the subsequent movement of the first driving rod 6 and the second driving rod 18, they will enter the first horizontal section 19 and the second horizontal section 20 respectively, thereby fixing the height of the sieve plate 14 and the retaining ring 13, so that the space above the sieve plate 14 is in an open state for a period of time to achieve stable delivery of large pieces of paint. Similarly, when the first driving rod 6 and the second driving rod 18 enter the first horizontal section 19 and the second horizontal section 20 from the lowest point respectively, the space below the sieve plate 14 is in an open state to achieve stable delivery of small pieces of paint.

[0043] Furthermore, the retaining ring 13 is provided with an escape portion 21. Specifically, the escape portion 21 is an inclined surface provided at the top and bottom of the retaining ring 13, so that the horizontal area of ​​the top and bottom of the retaining ring is reduced, so as to reduce the resistance required when the retaining ring 13 switches between the first position and the second position, and can also avoid the paint being stuck between the top of the retaining ring 13 and the lower surface of the intermediate rotating frame 11 and between the bottom of the retaining ring 13 and the upper surface of the grinding disc 2 as much as possible.

[0044] It should be noted that when the height difference between the highest point and the lowest point of the second drive groove 17 is greater than twice the height difference between the highest point and the lowest point of the first drive groove 5, the inclination angle of the bent part of the second drive groove 17 will be too large. When the second drive rod 18 slides with the bent part, a sense of frustration will be generated, making the transmission plate 15 rotate not smoothly enough. As another embodiment of the present invention, a stroke amplification component is arranged between the grinding wheel 2 and the transmission plate 15. Specifically, in the present embodiment, the transmission plate 15 is a split structure, the retaining ring 13 is fixed to one part of the transmission plate 15, and the height difference between the highest point and the lowest point of the second driving groove 17 is set to 1.5 times the height difference between the highest point and the lowest point of the first driving groove 5. The stroke amplification component can be a linear reciprocating drive component such as an electric push rod. When the second driving rod 18 slides along the second driving groove 17 to drive the retaining ring 13 to rise and fall, the lifting distance of the retaining ring 13 at this time is 1.5 times the lifting distance of the sieve plate 14. The 1.5 times height difference makes it possible for the second driving rod 18 to slide with the bending part without causing a sense of frustration. However, at this time, the retaining ring 13 cannot completely block the space above or below the sieve plate 14. Therefore, the stroke amplification component is used to control the retaining ring 13 to move a larger distance, thereby solving the frustration problem while still being able to completely block the space above or below the sieve plate 14.

[0045] As an alternative solution for the above-mentioned electric push rod to drive the retaining ring 13 to further rise and fall, the stroke amplification component includes a gear 22, the transmission plate 15 includes an outer ring 1502 and an inner ring 1501 slidably arranged inside the outer ring 1502, a bracket 23 is arranged on the outer ring 1502, the gear 22 is rotatably arranged on the bracket 23, a first tooth plate 24 is fixedly connected to the power shaft 7, a second tooth plate 25 is arranged on the inner ring 1501, and the first tooth plate 24 and the second tooth plate 25 are both engaged with the gear 22. Specifically, two groups of stroke amplification components are provided, and the two groups of stroke amplification components are symmetrically arranged about the transmission plate 15. The inner ring 1501 is slidably provided on the power shaft 7, and a limiting structure for preventing the two from rotating relative to each other is provided between the two. The inner ring 1501 is provided with a second limiting block 26, and the outer ring 1502 is provided with a second limiting groove 27. Through the connection between the second limiting block 26 and the second limiting groove 27, the inner ring 1501 and the outer ring 1502 cannot rotate relative to each other. The bracket 23 is fixed on the lower surface of the outer ring 1502, and the gear 22 is rotatably arranged at the bottom end of the bracket 23. The first tooth plate 24 is L-shaped, and the end of its horizontal side is fixed on the outer peripheral surface of the power shaft 7. The tooth portion is arranged on the vertical side of the first tooth plate 24. The second tooth plate 25 is fixed on the lower surface of the inner ring 1501. The first tooth plate 24 and the second tooth plate 25 are respectively located on both sides of the gear 22, and the first tooth plate 24 and the second tooth plate 25 are both meshed with the gear 22. The second driving rod 18 is fixedly connected to the outer peripheral surface of the outer ring 1502. The purpose of such a setting is that when the second driving rod 18 is connected to the second driving groove 17 to drive the outer ring 1502 to rise and fall, it will drive the bracket 23 and the gear 22 to rise and fall synchronously. During the lifting and lowering process of the gear 22, under the action of the meshing of the gear 22 and the first tooth plate 24, it will rotate itself. Therefore, during the downward movement of the gear 22 and the second tooth plate 25 and the self-rotation, the lifting distance of the second tooth plate 25 will be twice the lifting distance of the gear 22. Because the height difference between the highest point and the lowest point of the second driving groove 17 is set to 1.5 times the height difference between the highest point and the lowest point of the first driving groove 5, in conjunction with the stroke amplification component, the lifting distance of the retaining ring 13 is three times (1.5*2) the lifting distance of the sieve plate 14, thereby achieving the effect of stroke amplification. In this way, while solving the problem of frustration, the space above or below the sieve plate 14 can still be passively blocked.

[0046] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A powder grinding device for powder coating production, comprising a housing and a grinding disc rotatably arranged inside the housing, wherein the housing is also provided with a power assembly for driving the grinding disc to rotate, characterized in that: The housing is provided with a passive extrusion mechanism; When the power assembly drives the grinding disc to rotate, the passive extrusion mechanism drives the grinding disc to rise and fall vertically.

2. The powder grinding device for powder coating production according to claim 1, characterized in that: The passive extrusion mechanism comprises a first driving groove opened on the inner wall of the shell, a first driving rod matched with the first driving groove is fixedly connected to the grinding disc, and the first driving rod is slidably connected with the first driving groove.

3. The powder grinding device for powder coating production according to claim 2, characterized in that: The power assembly comprises a power shaft, the grinding disc is provided with a connecting shaft, and the power shaft is slidably connected to the connecting shaft; A limiting component is provided between the power shaft and the connecting shaft to prevent relative rotation between the power shaft and the connecting shaft.

4. The powder grinding device for powder coating production according to claim 2, characterized in that: The grinding disc is provided with an alternating feeding mechanism for allowing large pieces of paint and small pieces of paint to enter the grinding disc at intervals.

5. The powder grinding device for powder coating production according to claim 4, characterized in that: The alternating delivery mechanism comprises a transfer frame, a limit rod is arranged between the transfer frame and the grinding disc, and a retaining ring is slidably arranged on the limit rod; It also includes a sieve plate that matches the size of the retaining ring, and the sieve plate is fixed to the limiting rod; The retaining ring has a first position for allowing large pieces of paint to enter the grinding disc and a second position for allowing small pieces of paint to enter the grinding disc.

6. The powder grinding device for powder coating production according to claim 5, characterized in that: When the first driving rod is located at the highest point of the first driving groove, the retaining ring is in the first position, and when the first driving rod is located at the lowest point of the first driving groove, the retaining ring is in the second position.

7. The powder grinding device for powder coating production according to claim 5, characterized in that: A transmission plate is arranged on the power shaft, a connecting rod is arranged on the retaining ring, and the connecting rod penetrates the grinding disc and is fixedly connected to the transmission plate; The inner wall of the shell is provided with a second driving groove, and a second driving rod matched with the second driving groove is fixedly connected to the transmission plate, and the second driving rod is slidably connected with the second driving groove.

8. The powder grinding device for powder coating production according to claim 5, characterized in that: The first driving groove is provided with a first horizontal section, and the second driving groove is provided with a second horizontal section, and the positions of the first horizontal section and the second horizontal section are arranged correspondingly.

9. The powder grinding device for powder coating production according to claim 5, characterized in that: The retaining ring is provided with an escape portion.

10. The powder grinding device for powder coating production according to claim 7, characterized in that: A stroke amplification component is arranged between the grinding disc and the transmission plate.

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