Powder processing structure and coating machine

Abstract

This invention relates to the field of coating machine technology, and in particular to a powder processing structure, including a stationary ring and a rotating ring. The stationary ring includes an outer ring body, a connecting body, and an inner ring body. The outer end of the connecting body is fixedly connected to the outer ring body, and the inner end of the connecting body is fixedly connected to the inner ring body. The outer ring body is arranged on the cover plate of the coating machine, and a rotating cavity is left between the outer ring body and the inner ring body. The rotating ring includes a rotating body and a mounting body, which are fixedly connected. The rotating body is arranged in the rotating cavity, and the mounting body is arranged on the main shaft of the coating machine. The stationary ring is arranged on the cover plate, and the rotating ring is arranged on the main shaft. During the rotation of the main shaft, the rotating ring and the main shaft are relatively stationary, avoiding the possibility of dynamic wear of the sealing ring between the rotating ring and the main shaft, realizing non-contact sealing, reducing friction loss, extending the service life of the sealing structure, and also realizing a dual mechanism of dynamic gas isolation and shutdown backflow to prevent powder leakage.

Description

Technical Field

[0001] This invention relates to the field of coating machine technology, and in particular to a powder processing structure, and also to a coating machine using the powder processing structure. Background Technology

[0002] The coating machine consists of a high-speed rotating spindle, stirring rods, and impact hammers. Powder entering the machine's cylinder is subjected to impact, friction, and shearing under the high-speed stirring of the stirring rods. This ensures thorough contact and mixing between the powder particles and the modifier, resulting in sufficient coating modification of the powder material. During powder material processing, the coating machine requires the spindle to drive the cylinder to rotate to complete the coating process. In existing technologies, the dynamic seal between the cover plate and the spindle often uses a contact seal (such as a rubber seal). However, powder particles easily disperse into the contact gap between the seal lip and the spindle, leading to increased friction and accelerated seal wear, thus shortening its service life. Furthermore, powder tends to accumulate in the sealing area when the machine is stopped, increasing the risk of seal failure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the problem in the prior art that powder particles are easily dispersed into the contact gap between the sealing ring lip and the main shaft, which leads to an increase in the coefficient of friction, aggravated wear of the sealing ring, and thus a shortened service life, and to provide a powder processing structure.

[0004] The technical solution adopted by this invention to solve its technical problem is: a powder processing structure, including a stationary ring and a moving ring.

[0005] The stationary ring includes an outer ring body, a connecting body, and an inner ring body. The outer end of the connecting body is fixedly connected to the outer ring body, and the inner end of the connecting body is fixedly connected to the inner ring body. The outer ring body is arranged on the cover plate of the coating machine, and a rotating cavity is left between the outer ring body and the inner ring body.

[0006] The rotating ring includes a rotating body and a mounting body, which are fixedly connected. The rotating body is arranged inside the rotating cavity, and the mounting body is arranged on the main shaft of the coating machine.

[0007] The outer ring surface of the rotating body and the inner ring surface of the outer ring body are arranged opposite each other, and an outer ring gap is left between the outer ring surface of the rotating body and the inner ring of the outer ring body.

[0008] The inner ring surface of the rotating body and the outer ring surface of the inner ring body are arranged opposite each other, and an inner ring gap is left between the inner ring surface of the rotating body and the outer ring surface of the inner ring body.

[0009] A first gap is left between the end face of the rotating body near the connecting body and the connecting body.

[0010] A second gap is left between the mounting body and the end face of the inner ring body.

[0011] An air passage is provided between the inner ring surface of the inner body and the main shaft.

[0012] The outer ring gap, first gap, inner ring gap, second gap, and air passage are sequentially connected. The air passage supplies air to the outer ring gap. The stationary ring is arranged on the cover plate, and the rotating ring is arranged on the main shaft. During the rotation of the main shaft, the rotating ring and the main shaft are relatively stationary, avoiding the possibility of dynamic wear of the seal between the rotating ring and the main shaft. This transforms the traditional sealing method of contact between the seal and the main shaft into a non-contact rotational seal between the rotating and stationary rings, thus limiting the possible dispersion of powder to between the rotating and stationary rings. A stable fluid film is formed between the rotating and stationary rings through a micron-level gap, completely avoiding mechanical friction. The groove-shaped rotating cavity formed on the stationary ring, in conjunction with the rotating ring, can achieve triple sealing. Furthermore, the gap between the stationary and rotating rings, in conjunction with the air passage, achieves non-contact sealing, reducing friction loss and extending the life of the sealing structure. It also achieves a dual mechanism of dynamic gas isolation and shutdown backflow to prevent powder leakage.

[0013] When the spindle rotates, the gas input through the air passage hinders the dispersion of powder within the outer ring gap;

[0014] When the main shaft stops, the gas input through the air duct drives the powder in the outer ring gap back into the cylinder of the coating machine.

[0015] To address the issue of poor sealing between the outer ring and the cover plate, a sealing structure is further included, comprising a first sealing ring. A first sealing groove for accommodating the first sealing ring is provided on the outer ring surface of the outer ring, and the first sealing ring is arranged within the first sealing groove.

[0016] To address the issue of poor sealing between the mounting body and the spindle, a sealing structure is further included, comprising a second sealing ring. A second sealing groove for accommodating the second sealing ring is provided on the inner ring surface of the mounting body, and the second sealing ring is arranged within the second sealing groove.

[0017] To address the issue of poor sealing between the stationary and rotating rings, the system further includes a plurality of first sealing teeth recessed on the outer ring surface of the rotating body, a plurality of second sealing teeth recessed on the end face of the rotating body near the connecting body, and a plurality of third sealing teeth recessed on the inner ring surface of the rotating body.

[0018] It further includes a ventilation chamber on the cover plate that communicates with the air passage.

[0019] To address the issue of powder easily dispersing into the outer ring gap due to the direct connection between the outer ring gap and the cylinder, the system further includes a blocking body protruding from the end of the outer ring surface of the rotating body near the cylinder. A blocking groove matching the blocking body is formed on the inner ring surface of the outer ring body. The blocking body is located within the blocking groove. The outer ring surface of the blocking body and the inner ring surface of the blocking groove are arranged opposite to each other. A first rotational gap is left between the outer ring surface of the blocking body and the inner ring surface of the blocking groove. A third gap is left between the end face of the blocking body and the end face of the blocking groove. The first rotational gap, the third gap, and the outer ring gap are connected in sequence.

[0020] It further includes a notch on the bottom of the outer ring body for powder to flow out.

[0021] A coating machine that employs a powder sealing structure.

[0022] The beneficial effects of this invention are as follows: The powder sealing structure provided by this invention has a stationary ring arranged on a cover plate and a rotating ring arranged on a main shaft. During the rotation of the main shaft, the rotating ring and the main shaft remain relatively stationary, avoiding the possibility of dynamic wear of the sealing ring between the rotating ring and the main shaft. This transforms the traditional sealing method of contact between the sealing ring and the main shaft into a non-contact rotational seal between the rotating ring and the stationary ring, thereby limiting the possible dispersion of powder to between the rotating ring and the stationary ring. A stable fluid film is formed between the rotating ring and the stationary ring through a micron-level gap, completely avoiding mechanical friction. The groove-shaped rotating cavity formed on the stationary ring, in conjunction with the rotating ring, can achieve triple sealing. Furthermore, the gap between the stationary ring and the rotating ring, in conjunction with the air passage, achieves non-contact sealing, reducing friction loss and extending the life of the sealing structure. It can also achieve a dual mechanism of dynamic gas isolation and shutdown backflow to prevent powder leakage. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

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

[0025] Figure 2 This is the present invention. Figure 1 Enlarged structural diagram at point A;

[0026] Figure 3 This is the present invention. Figure 1 Enlarged structural diagram at point B;

[0027] Figure 4 This is the present invention. Figure 2 A schematic diagram showing the powder flow path and the gas flow path;

[0028] Figure 5 This is a cross-sectional structural diagram of the stationary ring and the moving ring of the present invention;

[0029] Figure 6 This is a right-side view of the structure at the stationary and moving rings of the present invention;

[0030] Figure 7 This is the present invention. Figure 4 A magnified schematic diagram of a portion of the structure.

[0031] In the diagram: 1. Stationary ring, 11. Outer ring body, 111. First sealing groove, 112. Blocking groove, 113. Notch, 12. Connecting body, 13. Inner ring body, 2. Moving ring, 21. Rotating body, 211. First sealing tooth, 212. Second sealing tooth, 213. Third sealing tooth, 22. Mounting body, 221. Second sealing groove, 23. Blocking body, 3. Rotating cavity, 31. Outer ring gap, 32. Inner ring gap, 33. First gap, 34. Second gap, 35. Air passage, 36. First rotation gap, 37. Third gap, 4. First sealing ring, 5. Second sealing ring, 6. Cover plate, 61. Vent chamber, 7. Main shaft, 8. Cylinder body. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0033] like Figure 1 This is a schematic diagram of the structure of the present invention, a powder processing structure, including a stationary ring 1 and a moving ring 2, wherein the stationary ring 1 and the moving ring 2 are located between the cover plate 6 and the main shaft 7;

[0034] The stationary ring 1 includes an outer ring body 11, a connecting body 12, and an inner ring body 13. The outer end of the connecting body 12 is fixedly connected to the outer ring body 11, and the inner end of the connecting body 12 is fixedly connected to the inner ring body 13. The outer ring body 11 is arranged on the cover plate 6 of the coating machine, and a rotating cavity 3 is left between the outer ring body 11 and the inner ring body 13.

[0035] The rotating ring 2 includes a rotating body 21 and a mounting body 22, which are fixedly connected. The rotating body 21 is arranged inside the rotating cavity 3, and the mounting body 22 is arranged on the main shaft 7 of the coating machine.

[0036] The outer ring surface of the rotating body 21 and the inner ring surface of the outer ring body 11 are arranged opposite to each other, and an outer ring gap 31 is left between the outer ring surface of the rotating body 21 and the inner ring of the outer ring body 11. The outer ring gap 31 is perpendicular to the first gap 33.

[0037] The inner ring surface of the rotating body 21 and the outer ring surface of the inner ring body 13 are arranged opposite to each other, and an inner ring gap 32 is left between the inner ring surface of the rotating body 21 and the outer ring surface of the inner ring body 13. The inner ring gap 32 is perpendicular to the second gap 34.

[0038] A first gap 33 is left between the end face of the rotating body 21 near the connecting body 12 and the connecting body 12. The first gap 33 is perpendicular to the inner ring gap 32.

[0039] A second gap 34 is provided between the end faces of the mounting body 22 and the inner ring body 13, and the second gap 34 is perpendicular to the air passage 35.

[0040] An air passage 35 is provided between the inner ring surface of the inner ring body 13 and the main shaft 7.

[0041] like Figure 2 , 3 As shown, the outer ring gap 31, the first gap 33, the inner ring gap 32, the second gap 34, and the air passage 35 are connected in sequence. The air passage 35 is used to supply air to the outer ring gap 31. The stationary ring 1 is arranged on the cover plate 6, and the rotating ring 2 is arranged on the main shaft. During the rotation of the main shaft 7, the rotating ring 2 and the main shaft 7 are relatively stationary, avoiding the possibility of dynamic wear of the sealing ring between the rotating ring 2 and the main shaft 7. The traditional sealing method of contact between the sealing ring and the main shaft 7 is changed to a non-contact rotational seal between the rotating ring 2 and the stationary ring 1, thereby limiting the possible dispersion of powder to between the rotating ring 2 and the stationary ring 1. A stable fluid film is formed between the rotating ring 2 and the stationary ring 1 through a micron-level gap, completely avoiding mechanical friction. The groove-shaped rotating cavity 3 formed on the stationary ring 1 can achieve triple sealing in cooperation with the rotating ring. Moreover, the gap between the stationary ring 1 and the rotating ring 2 can achieve non-contact sealing in cooperation with the air passage, reducing friction loss, extending the service life of the sealing structure, and also realizing a dual mechanism of dynamic gas isolation and shutdown backflow to prevent powder leakage.

[0042] When the main shaft 7 rotates, the gas input through the air passage 35 hinders the dispersion of powder within the outer ring gap 31;

[0043] When the main shaft 7 stops, the gas input through the air passage 35 drives the powder in the outer ring gap 31 back into the cylinder 8 of the coating machine.

[0044] like Figure 2 , 3 As shown, the sealing structure includes a first sealing ring 4. A first sealing groove 111 for accommodating the first sealing ring 4 is provided on the outer ring surface of the outer ring body 11. The first sealing ring 4 is arranged in the first sealing groove 111. Through the design of the first sealing ring 4, the sealing performance between the outer ring body 11 and the cover plate 6 is ensured. The groove depth of the first sealing groove 111 is smaller than the diameter of the first sealing ring 4. Under the cooperation of the cover plate 6, the first sealing groove 111 forces the first sealing ring 4 to deform to ensure the sealing performance between the outer ring body 11 and the cover plate 6.

[0045] like Figure 2 , 3As shown, the sealing structure includes a second sealing ring 5. A second sealing groove 221 for accommodating the second sealing ring 5 is provided on the inner ring surface of the mounting body 22. The second sealing ring 5 is arranged in the second sealing groove 221. Through the design of the second sealing ring 5, the sealing performance between the mounting body 22 and the spindle 7 is ensured. The groove depth of the second sealing groove 221 is smaller than the diameter of the second sealing ring 5. Under the cooperation of the spindle 7, the second sealing groove 221 forces the second sealing ring 5 to deform to ensure the sealing performance between the mounting body 22 and the spindle 7.

[0046] like Figure 2 , 3 As shown, a plurality of first sealing teeth 211 are recessed on the outer ring surface of the rotating body 21. The first sealing teeth 211 and the outer ring body 11 are arranged opposite to each other and form a first-level labyrinth seal. A plurality of second sealing teeth 212 are recessed on the end face of the rotating body 21 near the connecting body 12. The second sealing teeth 212 and the connecting body 12 are arranged opposite to each other and form a second-level labyrinth seal. A plurality of third sealing teeth 213 are recessed on the inner ring surface of the rotating body 21. The third sealing teeth 213 and the inner ring body 13 are arranged opposite to each other and form a first-level labyrinth seal. The three-sided labyrinth structure forms multiple tortuous flow channels, forcing the fluid to undergo multiple changes in direction and dissipation of kinetic energy, thus reducing leakage resistance.

[0047] The triple labyrinth seal structure formed by the first sealing tooth 211, the second sealing tooth 212, and the third sealing tooth 213 increases the meandering powder passage path and significantly increases the number of axial and radial turns in the powder dispersion path. Utilizing the turbulence effect and centrifugal force of the airflow within the gap, powder particles are forced to collide and decelerate multiple times in the complex flow channel, greatly reducing the kinetic energy of powder leakage outward. This results in a significant improvement in dynamic sealing performance. Furthermore, the vortex effect of the sealing teeth can generate local turbulence on the retained powder. Combined with the reverse guiding effect of the blocking body 23 on the powder, the powder is directed back into the cylinder 8 along a preset path under the drive of the airflow. This mechanism not only avoids the accumulation and solidification of powder in the sealing gap during shutdown but also extends the maintenance-free cycle of the sealing structure through an active dust removal function.

[0048] The cover plate 6 has a ventilation chamber 61 that communicates with the air passage 35. In actual use, gas is introduced into the ventilation chamber 61 by an air pump. The ventilation chamber 61 has an inlet and an outlet. The output end of the air pump is connected to the inlet of the air passage 4. The ventilation chamber 61 and the air passage 35 are connected.

[0049] like Figure 2 , 3As shown, a blocking body 23 protrudes from the outer ring surface of the rotating body 21 near the end of the cylinder 8. A blocking groove 112 matching the blocking body 23 is formed on the inner ring surface of the outer ring body 11. The blocking body 23 is located in the blocking groove 112. The outer ring surface of the blocking body 23 and the inner ring surface of the blocking groove 112 are arranged opposite to each other, and a first rotational gap 36 is left between the outer ring surface of the blocking body 23 and the inner ring surface of the blocking groove 112. A third gap 37 is left between the end face of the blocking body 23 and the end face of the blocking groove 112. The first rotational gap 36 and the third gap 37 are... Gap 37 and outer ring gap 31 are connected sequentially. The first rotation gap 36 is perpendicular to the third gap 37, and the third gap 37 is perpendicular to the outer ring gap 31. The third gap 37 and the first rotation gap 36 are formed by the design of the blocking body 23 and the blocking groove 112, which also increases the detour of the powder passage path and significantly increases the number of axial and radial turns of the powder dispersion path. Moreover, the cooperation between the blocking body 23 and the blocking groove 112 forms an additional air resistance barrier when the main shaft 7 rotates, forming a gradient pressure distribution with the basic gaps such as the outer ring gap 31 and the inner ring gap 32. By gradually consuming the powder dispersion pressure, the sealing adaptability to micron-sized ultrafine powders is further enhanced, especially suitable for harsh working conditions with high speed and high dust concentration.

[0050] In another embodiment: as Figure 6 As shown, a notch 113 for powder to flow out is provided on the bottom of the outer ring body 11. The design of the notch 513 makes it easier for the powder blown out by the airflow to flow back into the cylinder 3.

[0051] A coating machine that employs a powder processing structure.

[0052] Working principle:

[0053] Dynamic sealing stage (during spindle rotation):

[0054] When the coating machine starts, the main shaft 7 drives the rotating ring 2 to rotate at high speed. An external air source continuously inputs compressed gas (such as clean air or inert gas) into the outer ring gap 31 through the venting chamber 61 on the cover plate 6. The gas flows through the venting chamber 61 in sequence through the air passage 35, the second gap 34, the inner ring gap 32, the first gap 33, the outer ring gap 31, the third gap 37, the first rotation gap 36, and the cylinder 8.

[0055] During this process: High-pressure gas forms a positive air curtain within the second gap 34, inner ring gap 32, first gap 33, outer ring gap 31, third gap 37, and first rotating gap 36, directly preventing the powder inside the cylinder 8 from dispersing into the sealing area between the stationary ring 1 and the moving ring 2; When the gas flows through the first sealing tooth 211, second sealing tooth 212, or third sealing tooth 213, local turbulence is generated, and the powder particles are impacted by centrifugal force, impacting the inner wall of the rotating cavity 3 or the rotating body 21 and decelerating. At the same time, the first rotating gap 36, formed by the blocking body 23 and the blocking groove 112, further extends the powder dispersion path, forcing the powder to attenuate its kinetic energy during multiple turns, forming a multi-stage barrier. The size design of each gap (e.g., 0.1-0.3 mm) ensures that the gas flow rate and pressure decrease step by step, and finally guides the trace residual powder back into the cylinder 8 through the low-pressure area of ​​the first rotating gap 36, achieving dynamic sealing.

[0056] Shutdown and reflow phase (when the spindle stops):

[0057] When the coating machine stops and the main shaft 7 comes to a standstill, the air source continues to supply air at low pressure to achieve reverse cleaning of the powder. The gas diffuses in the reverse direction along the original flow path and enters through the air passage 35 (e.g., Figure 7 (In the gas flow path), the powder particles retained in the rotating cavity 3 are sequentially flushed through the second gap 34, inner ring gap 32, first gap 33, outer ring gap 31, third gap 37, and first rotation gap 36, thus backwashing them (e.g., Figure 7 The powder flows out of the rotating cavity 3 (through the flow path of the powder) or even flows back into the cylinder 8; the notch 113 at the bottom of the outer ring 11 falls naturally under the action of gravity and is combined with the airflow to ensure that there is no powder residue in the sealing gap.

[0058] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A powder processing structure, characterized in that, It includes a stationary ring (1) and a moving ring (2). The stationary ring (1) includes an outer ring body (11), a connecting body (12), and an inner ring body (13). The outer end of the connecting body (12) is fixedly connected to the outer ring body (11), and the inner end of the connecting body (12) is fixedly connected to the inner ring body (13). The outer ring body (11) is arranged on the cover plate (6) of the coating machine. A rotating cavity (3) is left between the outer ring body (11) and the inner ring body (13). The rotating ring (2) includes a rotating body (21) and a mounting body (22), which are fixedly connected. The rotating body (21) is arranged in the rotating cavity (3), and the mounting body (22) is arranged on the main shaft (7) of the coating machine. The outer ring surface of the rotating body (21) and the inner ring surface of the outer ring body (11) are arranged opposite to each other, and an outer ring gap (31) is left between the outer ring surface of the rotating body (21) and the inner ring of the outer ring body (11). The inner ring surface of the rotating body (21) and the outer ring surface of the inner ring body (13) are arranged opposite to each other, and an inner ring gap (32) is left between the inner ring surface of the rotating body (21) and the outer ring surface of the inner ring body (13). A first gap (33) is left between the end face of the rotating body (21) near the connecting body (12) and the connecting body (12). A second gap (34) is left between the end faces of the mounting body (22) and the inner ring body (13). An air passage (35) is provided between the inner ring surface of the inner ring body (13) and the main shaft (7). The outer ring gap (31), the first gap (33), the inner ring gap (32), the second gap (34) and the air passage (35) are connected in sequence, and the air passage (35) is used to supply air to the outer ring gap (31).

2. The powder processing structure as described in claim 1, characterized in that: Includes a first sealing ring (4), and the outer ring body (11) has a first sealing groove (111) for accommodating the first sealing ring (4) on its outer ring surface, and the first sealing ring (4) is arranged in the first sealing groove (111).

3. The powder processing structure as described in claim 1, characterized in that: The second sealing ring (5) is provided on the inner ring surface of the mounting body (22) for accommodating the second sealing ring (5), and the second sealing ring (5) is arranged in the second sealing groove (221).

4. The powder processing structure as described in claim 1, characterized in that: The outer ring surface of the rotating body (21) has a plurality of first sealing teeth (211) recessed, the end face of the rotating body (21) near the connecting body (12) has a plurality of second sealing teeth (212) recessed, and the inner ring surface of the rotating body (21) has a plurality of third sealing teeth (213) recessed.

5. The powder processing structure as described in claim 1, characterized in that: The cover plate (6) has a ventilation cavity (61) that communicates with the air passage (35).

6. The powder processing structure as described in claim 1, characterized in that: A blocking body (23) is formed on the outer ring surface of the rotating body (21) near the end of the cylinder (8). A blocking groove (112) matching the blocking body (23) is opened on the inner ring surface of the outer ring body (11). The blocking body (23) is located in the blocking groove (112). The outer ring surface of the blocking body (23) and the inner ring surface of the blocking groove (112) are arranged opposite to each other. A first rotation gap (36) is left between the outer ring surface of the blocking body (23) and the inner ring surface of the blocking groove (112). A third gap (37) is left between the end face of the blocking body (23) and the end face of the blocking groove (112). The first rotation gap (36), the third gap (37) and the outer ring gap (31) are connected in sequence.

7. The powder processing structure as described in claim 1, characterized in that: The bottom of the outer ring (11) is provided with a notch (113) for powder to flow out.

8. The powder processing structure as described in claim 1, characterized in that: When the main shaft (7) rotates, the gas input through the air passage (35) hinders the dispersion of powder within the outer ring gap (31); When the main shaft (7) stops, the gas input through the air passage (35) drives the powder in the outer ring gap (31) back into the cylinder (8) of the coating machine.

9. A coating machine, characterized in that: The coating machine adopts a powder processing structure as described in any one of claims 1-8.

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