Recycling mechanism for powder feeding
By designing a powder feeding and recovery mechanism, the problem of powder scattering during the conveying process was solved by using rotating blades and a sealing structure, achieving efficient powder recovery and environmental protection, and reducing production costs.
Patent Information
- Application Number
- CN202520547913.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2035-03-26
AI Technical Summary
Existing powder conveying devices are prone to powder scattering during the transfer process, resulting in losses and environmental pollution, increasing production costs and posing a threat to health.
A powder feeding and recovery mechanism was designed, including a frame, a fixed cylinder and a rotating cylinder. The rotating blades cover the feed inlet and recover the powder that is thrown up to the upper surface of the powder conveying channel and slide into the receiving equipment. The blades and sealing structure prevent powder leakage.
It effectively recovers the dust that is thrown up, reducing losses and environmental pollution, lowering production costs, ensuring the health of operators, and has a simple structure and low cost.
Smart Images
Figure CN223813128U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to material conveying technical field especially relates to a recovery mechanism of powder feeding. BACKGROUND
[0002] In the industrial production process, the powder generated in the production process needs to be sent into the equipment again to realize the recycling of resources and reduce waste. However, the existing powder conveying device still has many problems in actual application, and improvement is urgently needed.
[0003] At present, the powder conveying mode mainly depends on the chute or the conveying belt. Although these traditional conveying modes can complete the transfer of the powder to a certain extent, there are obvious defects in actual operation. When the powder is put into the receiving equipment or the container through the chute or the conveying belt, the particles of the powder are small and light in texture, which can easily scatter due to air flow in the falling process, or can scatter due to impact when falling into the receiving equipment or the container. The scattered powder will flow out to the outside through the feeding port of the receiving equipment or the container. This phenomenon not only leads to the loss of the powder and increases the production cost, but also causes serious pollution to the surrounding environment, affects the air quality of the production site, and may also pose a potential threat to the health of the operators. SUMMARY
[0004] The utility model aims at at least one of the technical problems in the related art to some extent.
[0005] Therefore, according to the embodiment of the present disclosure, a recovery mechanism of powder feeding is provided, which comprises:
[0006] The rack is arranged on the powder conveying channel, and the powder conveying channel passes through the rack.
[0007] The fixed cylinder is arranged on the surface of one side of the rack, and the fixed cylinder is arranged around the powder conveying channel.
[0008] The powder recovery assembly is rotatably arranged on the fixed cylinder, and the fixed cylinder is arranged around the powder conveying channel. The powder recovery assembly comprises:
[0009] The rotating cylinder is arranged in the fixed cylinder.
[0010] The outer end plate is annular and connected to the rotating cylinder. The outer end plate is arranged on the feeding port of the receiving equipment, so that the outer end plate and the rotating cylinder are rotated under the driving of the receiving equipment.
[0011] The blade is arranged on the rotating cylinder, and a plurality of blades are arranged along the same circumference.
[0012] The blade comprises a connecting section and a bearing section; the connecting section is arranged along the radial direction of the rotating tunnel, one end of the connecting section is connected to the inner wall of the rotating cylinder, and the other end of the connecting section is connected to one end of the bearing section; the bearing section is arranged obliquely relative to the side of the connecting section in the rotating direction of the rotating cylinder, so that the bearing section is inclined downward relative to the horizontal plane when the blade moves above the powder conveying channel.
[0013] In the technical scheme, the structure design covers the feeding port of the receiving device, the raised powder can fall on the blade and accumulate on the blade, when the blade rotates above the powder conveying channel, the powder falls on the upper surface of the powder conveying channel and further slides into the feeding port of the receiving device, realizing the recycling of the raised powder, avoiding the loss of the powder, reducing the production cost, avoiding the pollution of dust to the surrounding environment, and ensuring the health of the operators; on the other hand, the blade rotates with the receiving device, without the need to set a power device, the structure is simple, and the cost is low.
[0014] In some embodiments, the powder recycling assembly further comprises:
[0015] The inner end plate is annular and arranged on the rotating cylinder; the surface of the inner end plate away from the rack is connected to the blade.
[0016] In the technical scheme, the structure design can provide more stable support for the blade, avoid deformation of the blade during rotation, and thus stably carry the powder; on the other hand, the inner end plate can block the powder from falling from the side of the blade, so as to ensure that the powder can fall to the surface of the powder conveying channel under the conveying of the blade, and the powder is recycled efficiently.
[0017] In some embodiments, a gap is arranged between the side of the blade close to the outer end plate and the outer end plate.
[0018] In the technical scheme, the structure design can better guide the powder into the bearing section of the blade, so that the raised powder can efficiently fall on the blade, and avoid hindering the recycling of the powder by the outer end plate; on the other hand, the existence of the gap reduces the direct contact between the blade and the outer end plate, reduces the wear between the two, and further improves the durability.
[0019] In some embodiments, the inner hole of the outer end plate is protruded relative to the blade towards the side close to the powder conveying channel.
[0020] In the technical scheme, the structure design helps to form a certain sealing effect, prevents the powder from leaking from the gap between the outer end plate and the powder conveying channel, and ensures the powder recycling efficiency.
[0021] In some embodiments, a gap is arranged between the end of the rotating cylinder away from the outer end plate and the rack.
[0022] In the technical solution, the structure design provides sufficient space for installation and maintenance, avoids mutual interference between components after assembly to hinder rotation, and on the other hand, the interval can adapt to axial movement during rotation of the receiving device, avoids direct contact between the rotating cylinder 301 and the rack 1, reduces friction between them, thereby reducing wear and tear and prolonging the service life of the device.
[0023] In some embodiments, an interval is provided between the end of the fixed cylinder away from the rack and the outer end plate.
[0024] In the technical solution, the structure design can adapt to axial movement during rotation of the receiving device, avoid direct contact between the fixed cylinder and the outer end plate, reduce friction between them, thereby reducing wear and tear and prolonging the service life of the device.
[0025] In some embodiments, the powder recovery assembly further comprises:
[0026] A sealing cylinder is sleeved around the periphery of the fixed cylinder, and one end of the sealing cylinder is connected to the outer end plate.
[0027] In the technical solution, the structure design can form a more effective sealing structure to prevent powder leakage from the gap between the fixed cylinder and the outer end plate, further reduce powder loss and environmental pollution; on the other hand, the sealing cylinder enhances the integrity of the powder recovery assembly, making the structure more compact, improving the stability and reliability of the device.
[0028] In some embodiments, an interval is provided between the end of the sealing cylinder away from the outer end plate and the rack.
[0029] In the technical solution, the structure design can adapt to axial movement during rotation of the receiving device, avoid direct contact between the sealing cylinder and the rack, reduce friction between them, thereby reducing wear and tear and prolonging the service life of the device; on the other hand, the interval provides convenience for the installation and adjustment of the sealing cylinder, ensuring that the sealing cylinder can be correctly installed and play its sealing role.
[0030] In some embodiments, further comprising:
[0031] Two baffle strips are provided, and the two baffle strips are respectively arranged on the two side edges of the upper surface of the powder conveying channel.
[0032] In the technical solution, the structure design can effectively prevent powder from overflowing from both sides during conveying, guide the powder to be conveyed along the predetermined path, and ensure that the powder can smoothly enter the powder recovery assembly, thereby improving the efficiency and reliability of powder recovery.
[0033] In some embodiments, a sealing groove is provided on the side wall of the rotating cylinder away from the powder conveying channel, and a sealing ring is installed in the sealing groove, which slides on the surface of the fixed cylinder.
[0034] In this technical solution, the structural design can further improve the sealing performance, prevent powder from leaking from the gap between the rotating cylinder and the fixed cylinder, and reduce powder loss and environmental pollution.
[0035] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0036] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0037] Figure 1 This is a schematic diagram of the structure of the powder feeding and recovery mechanism of this utility model. Figure 1 ;
[0038] Figure 2 This is a schematic diagram of the structure of the powder feeding and recovery mechanism of this utility model. Figure 2 ;
[0039] Figure 3 This is a cross-sectional view of the powder feeding and recovery mechanism of this utility model.
[0040] Figure 4 for Figure 3 A magnified view of a portion of the image;
[0041] Figure 5 This is a schematic diagram of the structure of the powder feeding and recycling mechanism of this utility model when connected to the receiving equipment.
[0042] In the picture:
[0043] 100. Feed box; 200. Powder conveying channel; 300. Hopper; 400. Base; 500. Motor;
[0044] 1. Frame; 2. Fixed cylinder; 3. Powder recovery assembly; 301. Rotating cylinder; 3011. Sealing groove; 302. Outer end plate; 303. Blade; 3031. Connecting section; 3032. Bearing section; 304. Inner end plate; 305. Sealing cylinder; 4. Stop bar. Detailed Implementation
[0045] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0046] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0047] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.
[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0049] like Figures 1 to 5 As shown in the schematic embodiment of the powder feeding and recycling mechanism of this utility model, the powder feeding and recycling mechanism includes a frame 1, a fixed cylinder 2, and a powder recycling component 3.
[0050] The powder is fed into the receiving equipment using a feeding device. The feeding device includes a feeding hopper 100 and a powder conveying channel 200 connected to the feeding hopper 100 at one end. A feeding port is opened at one end of the receiving equipment's hopper 300, and the powder conveying channel 200 extends into the receiving equipment's hopper 300 through the feeding port. The door of the feeding hopper 100 is opened, and the powder is fed into the feeding hopper 100. The powder in the feeding hopper 100 falls into the inclined powder conveying channel 200 and slides down along the powder conveying channel 200 into the receiving equipment.
[0051] The rack 1 is arranged on the powder conveying channel 200, so that the powder conveying channel 200 supports the rack 1. The rack 1 is provided with a mounting hole, and the powder conveying channel 200 passes through the rack 1 through the mounting hole. The mounting hole is fixedly connected with the powder conveying channel 200. The fixing cylinder 2 is arranged on the rack 1 and fixed to the surface of the rack 1 away from the feeding box 100. The fixing cylinder 2 is sleeved on the periphery of the powder conveying channel 200, so that the powder conveying channel 200 passes through the fixing cylinder 2. The powder recycling assembly 3 is arranged on the fixing cylinder 2 and can rotate on the fixing cylinder 2. The powder recycling assembly 3 has a whole annular structure, so that it is sleeved on the periphery of the powder conveying channel 200, and the powder conveying channel 200 passes through the powder recycling assembly 3.
[0052] The hopper 300 of the receiving device is rotatably arranged on the base 400 of the receiving device. The motor 500 drives the hopper 300 to rotate on the base 400 through gear transmission or belt transmission, so that the material in the hopper 300 is uniformly stirred to enter the next process.
[0053] The powder recycling assembly 3 includes a rotating cylinder 301, an outer end plate 302 and a blade 303. The outer end plate 302 is annular and connected with the rotating cylinder 301, so that the outer end plate 302 is sleeved on the periphery of the powder conveying channel 200. The outer end plate 302 is connected with the feeding port of the hopper 300 of the receiving device, so that the outer end plate 302 and the rotating cylinder 301 connected with the outer end plate 302 rotate with the hopper 300. The rotating cylinder 301 is arranged in the fixing cylinder 2, so that the rotating cylinder 301 rotates in the internal space of the fixing cylinder 2, and the port on the side of the rotating cylinder 301 away from the outer end plate 302 is covered by the fixing cylinder 2 and the rack 1. The blade 303 is arranged on the rotating cylinder 301, and a plurality of blades 303 are arranged on the rotating cylinder 301 at intervals, and the plurality of blades 303 are located on the same circumference.
[0054] Referring to Figure 2 The blade 303 includes a connecting section 3031 and a bearing section 3032. The connecting section 3031 is arranged along the radial direction of the rotating cylinder 301, one end of the connecting section 3031 is connected with the inner wall of the rotating cylinder 301, and the other end of the connecting section 3031 is connected with one end of the bearing section 3032. The bearing section 3032 is arranged obliquely to the side of the rotating cylinder 301 in the rotating direction of the connecting section 3031, so that when the blade 303 moves above the powder conveying channel 200, the bearing section 3032 is inclined downward relative to the horizontal plane.
[0055] The outer end plate 302 is mounted on the feed inlet of the bin 300, and the rotating cylinder 301 is coaxially connected so that the internal space of the rotating cylinder 301 is in communication with the internal space of the bin 300, and the powder lifted in the bin 300 can flow into the rotating cylinder 301. On the other hand, one end of the fixed cylinder 2 is connected to the rack 1, so that the port at one end of the fixed cylinder 2 is closed by the rack 1 or is in communication with the internal space of the rack 1. The rotating cylinder 301 is arranged in the fixed cylinder 2, so that the rotating cylinder 301 extends into the interior of the fixed cylinder 2 from the end of the fixed cylinder 2 away from the rack 1, and the end of the rotating cylinder 301 away from the bin 300 is covered by the fixed cylinder 2 and the rack 1. The powder flowing into the rotating cylinder 301 cannot flow out of the recovery mechanism and can only naturally settle and fall on the inner wall at the bottom of the rotating cylinder 301 or the surface of the blade 303. The rotating cylinder 301 rotates, and the powder falling on the inner wall of the rotating cylinder 301 also falls on the blade 303. The blade 303 rotates so that the powder falls on the upward side surface of the blade 303. Since the bearing segment 3032 of the blade 303 is arranged to be bent relative to the connecting segment 3031, the blade 303 has a V-shaped groove structure, and the powder is stably kept in the groove structure of the blade 303 during the upward rotation of the blade 303. Further, when the blade 303 rotates and rises above the powder conveying channel 200, the bearing segment 3032 gradually changes from an upward inclination to a downward inclination, and the powder on the surface of the blade 303 falls on the upper surface of the powder conveying device, so that the inclined upper surface of the powder conveying device slides down and falls back into the bin 300, achieving recovery of the lifted powder.
[0056] The structure design covers the feed inlet of the receiving device, and the lifted powder can only flow into the recovery mechanism and cannot flow out to the outside, avoiding dust pollution to the surrounding environment and ensuring the health of the operator. The powder flowing into the recovery mechanism falls on the rotating cylinder 301 and the blade 303 and is finally concentrated by the blade 303 and dropped on the upper surface of the powder conveying channel 200, and then slides down and falls back into the receiving device, achieving recovery of the lifted powder and avoiding loss of the powder and reducing production cost. The blade 303 and the rotating cylinder 301 rotate with the receiving device, without the need to set a power device, and have simple structure and low cost.
[0057] In the present application, refer to Figure 2 and Figure 4, the powder recycling assembly 3 further comprises an inner end plate 304. The inner end plate 304 is annular, so as to be sleeved on the periphery of the powder recycling assembly 3. The inner end plate 304 is arranged on the rotary cylinder 301, and the blades 303 are fixedly connected to the inner end plate 304 on the side close to the rack 1. This design enables the inner end plate 304 to prevent the powder drifting into the rotary cylinder 301 from further drifting to the side of the rack 1, and to block the powder in the rotary cylinder 301, so that the powder is fully settled on the blades 303, improving the efficiency of dust recycling. In addition, the inner end plate 304 connects the blades 303, so that the inner end plate 304 can act as a baffle for the blades 303, preventing the powder on the blades 303 from falling off the edge of the blades 303 close to the side of the rack 1, and ensuring that the powder can be stably conveyed by the blades 303 to the powder conveying channel 200 above and then collected and recycled to the hopper 300 through the upper and lower sliding of the powder conveying channel 200, achieving efficient powder recycling. The inner end plate 304 also reinforces the blades 303, so that the blades 303 will not deform during rotation and can stably bear the powder.
[0058] In the present application, referring to Figure 4 , a gap is provided between the side of the blades 303 close to the outer end plate 302 and the outer end plate 302. This structure avoids the outer end plate 302 completely shielding the space on the side of the blades 303 close to the hopper 300, so that the material raised in the hopper 300 can drift onto the blades 303, ensuring efficient conveying and recycling of the settled powder by the blades 303. In addition, the existence of the gap reduces the direct contact between the blades 303 and the outer end plate 302, avoiding wear between the two, further improving durability.
[0059] In the present application, referring to Figure 4 , the inner hole of the outer end plate 302 protrudes towards the side close to the powder conveying channel 200 relative to the blades 303. This design enables the outer end plate 302 to completely cover the space between the blades 303 and the inner wall of the rotary cylinder 301, making it difficult for the powder drifting into this space to flow out, so that the material is fully settled in this space, making the powder more smoothly collected and accumulated, and ensuring the efficiency of powder recycling.
[0060] In the present application, referring to Figure 4 , a gap is provided between the end of the rotary cylinder 301 away from the outer end plate 302 and the rack 1. Since the shaft will move axially during rotation, this gap can adapt to such axial movement, always maintaining a gap between the rotary cylinder 301 and the rack 1, avoiding direct contact between the rotary cylinder 301 and the rack 1, reducing friction between the two, thereby reducing wear and prolonging the service life of the equipment. On the other hand, the gap provides enough space for installation and maintenance, avoiding interference between components after assembly and hindering rotation.
[0061] In the present application, referring to Figure 4, the interval is provided between the end of the fixed cylinder 2 away from the frame 1 and the outer end plate 302. The structure design can also adapt to the axial movement occurred in the rotation process of the receiving device, avoid the direct contact between the fixed cylinder 2 and the outer end plate 302, reduce the friction between them, thereby reducing the wear and tear, prolonging the service life of the device.
[0062] In the present application, referring to Figure 1 and Figure 4 , the powder recycling assembly 3 further comprises a sealing cylinder 305. The sealing cylinder 305 is sleeved with the periphery of the fixed cylinder 2, and one end of the sealing cylinder 305 is connected with the outer end plate 302, so that the outer end plate 302 closes the port at one end of the sealing cylinder 305. The sealing cylinder 305 with one end closed covers the fixed cylinder 2, so that the sealing cylinder 305, the fixed cylinder 2 and the rotating cylinder 301 form a tortuous gap space, and it is difficult for dust to float out to the outside through the tortuous gap space. The structure design can form a more effective sealing structure, prevent the powder from leaking from the gap between the fixed cylinder 2 and the outer end plate 302, further reduce the loss of powder and environmental pollution, and at the same time avoid the wear and tear caused by the mutual contact between the cylindrical components. In addition, the sealing cylinder 305 enhances the integrity of the powder recycling assembly 3, covers other components inside it, makes the structure more compact, and improves the stability and reliability of the device.
[0063] In the present application, referring to Figure 4 , the sealing cylinder 305 is spaced apart between the end away from the outer end plate 302 and the frame 1. The structure design can also adapt to the axial movement occurred in the rotation process of the receiving device, avoid the direct contact between the sealing cylinder 305 and the frame 1, reduce the friction between them, thereby reducing the wear and tear, prolonging the service life of the device. In addition, the interval provides convenience for the installation and adjustment of the sealing cylinder 305, ensures that the sealing cylinder 305 can be correctly installed and play its sealing role.
[0064] In the present application, referring to Figures 1 to 4 , the powder feeding recycling mechanism further comprises a baffle 4. The baffle 4 has two, and the two baffles 4 are used to be installed on the two side edges of the upper surface of the powder conveying channel 200, so that the two baffles 4 and the upper surface of the powder conveying channel 200 form a guide chute. The structure design makes the powder thrown downward by the blade 303 slide down along the guide chute and return to the bin 300, prevents the powder from overflowing from the two side edges during the process of sliding down along the upper surface of the powder conveying channel 200, guides the powder to be conveyed along the predetermined path, and ensures that the powder can smoothly enter the powder recycling assembly 3, improves the efficiency and reliability of the powder recycling.
[0065] In the present application, referring to Figure 4A sealing groove 3011 is formed on the side wall of the rotary cylinder 301 away from the powder conveying channel 200, and a sealing ring (not shown in the drawing) is arranged in the sealing groove 3011 and slides on the surface of the fixed cylinder 2. The structure design can further improve the sealing performance, prevent the powder from leaking from the gap between the rotary cylinder 301 and the fixed cylinder 2, and reduce the loss of the powder and environmental pollution. In addition, the silo 300 also has radial movement during rotation, and the sealing ring can form radial support to prevent the rotary cylinder 301 from being removed from the inside of the fixed cylinder 2 due to the radial movement of the silo 300, prevent direct contact between the rotary cylinder 301 and the fixed cylinder 2 to cause wear, and improve the service life.
[0066] It should be finally pointed out that: the various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts of each embodiment can be referred to.
[0067] The above embodiments are only used to illustrate the technical solutions of the present application but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical scheme of the present application, all of them should be covered in the technical scheme range of the present application claimed by the present application.
Claims
1. A powder feeding and recycling mechanism, characterized in that, include: A frame is used to be installed on the powder conveying channel, and the powder conveying channel passes through the frame; A fixed cylinder is disposed on one side surface of the frame; The fixing cylinder is used to be sleeved around the powder conveying channel; A powder recovery assembly is rotatably mounted on the fixed cylinder; the fixed cylinder is used to be sleeved around the powder conveying channel. The powder recovery component includes: A rotating cylinder is disposed within the fixed cylinder; An outer end plate, which is annular and connected to the rotating cylinder; the outer end plate is disposed on the feed inlet of the receiving device so that the outer end plate and the rotating cylinder rotate under the drive of the receiving device; Blades are disposed on the rotating cylinder; multiple blades are spaced apart along the same circumference. The blade includes a connecting section and a carrying section; the connecting section is arranged radially along the rotating cylinder, one end of the connecting section is connected to the inner wall of the rotating cylinder, and the other end of the connecting section is connected to one end of the carrying section; the carrying section is inclined relative to the connecting section on the side of the rotating cylinder in the direction of rotation, so that when the blade moves above the powder conveying channel, the carrying section is inclined downward relative to the horizontal surface.
2. The powder feeding and recovery mechanism according to claim 1, characterized in that, The powder recovery assembly further includes: An inner end plate, in the shape of a ring, is disposed on the rotating cylinder; the blade is connected to the surface of the inner end plate on the side away from the frame.
3. The powder feeding and recovery mechanism according to claim 1, characterized in that, A gap is provided between the side of the blade closest to the outer end plate and the outer end plate.
4. The powder feeding and recovery mechanism according to claim 3, characterized in that, The inner hole of the outer end plate protrudes towards the side closer to the powder conveying channel relative to the blade.
5. The powder feeding and recovery mechanism according to claim 1, characterized in that, There is a gap between the end of the rotating cylinder away from the outer end plate and the frame.
6. The powder feeding and recovery mechanism according to claim 1, characterized in that, There is a gap between the end of the fixed cylinder away from the frame and the outer end plate.
7. The powder feeding and recovery mechanism according to claim 1, characterized in that, The powder recovery assembly further includes: a sealing cylinder, which is sleeved around the periphery of the fixed cylinder; one end of the sealing cylinder is connected to the outer end plate.
8. The powder feeding and recovery mechanism according to claim 7, characterized in that, The end of the sealing cylinder furthest from the outer end plate is spaced apart from the frame.
9. The powder feeding and recovery mechanism according to claim 1, characterized in that, Further includes: The baffle has two sections; the two baffles are respectively installed on the two sides of the upper surface of the powder conveying channel.
10. The powder feeding and recovery mechanism according to claim 1, characterized in that, A sealing groove is provided on the side wall of the rotating cylinder away from the powder conveying channel, and a sealing ring is installed in the sealing groove. The sealing ring slides on the surface of the fixed cylinder.