Cylinder and rotating shaft sealing connection mechanism for powder fusion machine

Abstract

The invention relates to the technical field of powder fusion machines, in particular to a barrel and rotating shaft sealing connection mechanism for a powder fusion machine, which comprises a bearing seat with a rotating shaft cavity and a barrel with a powder cavity, a first rotating shaft annular groove for sleeving the bearing and a second rotating shaft annular groove for movably sleeving the first shaft cover and the second shaft cover are formed in the outer wall of the rotating shaft; a first annular caulking groove for embedding the bearing, a second annular caulking groove for embedding the first shaft cover and a third annular caulking groove for embedding the second shaft cover are formed in the inner wall of the rotating shaft cavity; the first shaft cover can seal the rotating shaft cavity, and the second shaft cover can seal the powder cavity; and an air cavity is formed between the second shaft cover and the second shaft cover. The mechanism is simple in structure, easy to maintain, capable of achieving screw-free assembly and disassembly, good in sealing effect and capable of effectively prolonging the service life of the powder fusion machine, and the adjacent position and the outer side of the air cavity cannot be blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of powder fusion machines, and particularly to a sealing connection mechanism between a cylinder body and a rotating shaft for a powder fusion machine. Background Art

[0002] A powder fusion machine is a dry processing device based on the principle of mechanochemistry. Its core structure consists of a high-speed rotating rotor, a stator extrusion head, and a cavity. The powder particles are driven by centrifugal force to closely adhere to the cavity wall. A high-intensity extrusion force and shear force are formed in the gap between the rotor and the stator, enabling different particles to reach the "mechanical melting" state under the heat generated by friction, achieving the composite treatment of coating micron particles with nano materials. With the help of circulating blades, three-dimensional circulation multiple compression and shear are realized, combined with inert gas environment control technology, and finally the high-efficiency functional processing of particle surface modification, spheroidization, and dense filling is completed.

[0003] During the process of powder processing by powder equipment, especially during the processing of ultrafine powder, the main shaft of the powder equipment rotates at a high speed. Since the particle size of the powder is very small, if the sealing effect of the bearing supporting the main shaft is not good, the powder is very likely to enter the bearing, resulting in problems such as bearing jamming and failure. The existing sealing methods for the bearing of the main shaft are generally: using multiple sealing rings for sealing, using packing sealing for sealing, and using a dry grinding section similar to the mechanical seal style for sealing. The above sealing methods all have the problems of relatively complex structures, generating a large amount of heat due to increasing the movement resistance of the main shaft, and the sealing effects are not ideal enough.

[0004] The Chinese utility model patent with the publication number CN203500465U provides a powder equipment, including a main shaft, a plurality of bearings, and a powder working cavity. The main shaft is supported by a plurality of bearings. A bearing end cover is provided between the bearing close to the powder working cavity and the powder working cavity. Among them, at least two sealing members are provided longitudinally along the main shaft on the bearing end cover. An axle seal cover that isolates the sealing member from the powder working cavity and has a gap with the main shaft is provided outside the sealing member; the axle seal cover is provided with an air inlet channel for injecting gas, and the air inlet channel is communicated with the gap. This powder equipment injects gas into the air inlet channel, especially injecting gas with a pressure higher than the pressure in the powder working cavity. The gas enters the powder working cavity through the gap, so that the powder near the main shaft is blown away from the gap. Due to the setting of more than two sealing members, the powder cannot enter the bearing and cause bearing failure, with a simple structure, low cost, and good sealing effect.

[0005] This technical solution has the following problems: there is a gap between the axle seal cover and the main shaft, and the axle seal cover is provided with an air inlet channel for injecting gas, and the air inlet channel is communicated with the gap. 1. Poor dynamic sealing stability: When the main shaft has radial runout or vibration, the air flow distribution in the gap is uneven, and a low-pressure area may form in local areas, and the powder may still penetrate. That is, in actual applications, the gap needs to be precisely adjusted according to the working conditions. If the gap is too small, friction or shaft seizure is likely to occur due to thermal expansion during high-speed rotation; if the gap is too large, the gas leakage will increase, and the powder cannot be effectively blocked.

[0006] 2. Gas flow disturbs the process environment: High-pressure gas may blow away the powder, resulting in uneven powder distribution in the cavity (such as affecting particle classification in grinding equipment), and even causing dust flying and polluting the environment. In processes that require negative pressure or slightly positive pressure (such as some mixing or coating modification equipment), the injection of additional gas may disturb the pressure balance in the cavity and affect the process effect.

[0007] 3. Complex structure and maintenance difficulty: Components such as the shaft seal cover, air inlet channel, and exhaust ring need to be precisely matched, and installation deviation is likely to cause seal failure. For example, the coaxiality deviation between the shaft seal cover and the main shaft will exacerbate the uneven gas leakage.

[0008] 4. Risk of exhaust channel blockage: The powder may enter the exhaust channel through the exhaust ring, resulting in blockage (especially when dealing with viscous powder), the gas cannot be discharged in time, causing pressure accumulation in the seal area, and pushing the powder to invade the bearing in the reverse direction.

[0009] Therefore, there is an urgent need for a new technical solution to solve the above technical problems. Summary of the Invention

[0010] The purpose of the present invention is to overcome the problems of the above-mentioned prior art, and provide a sealing connection mechanism for the cylinder body and the rotating shaft of a powder fusion machine, so as to solve the technical problems of poor dynamic sealing stability, gas flow disturbing the process environment, complex structure and maintenance difficulty, and risk of exhaust channel blockage existing in the existing shaft seal.

[0011] The above purpose is achieved by the following technical solutions: A sealing connection mechanism for the cylinder body and the rotating shaft of a powder fusion machine, comprising a bearing seat with a rotating shaft cavity and a cylinder body with a powder cavity, characterized in that a rotating shaft is movably arranged in the rotating shaft cavity, and an outer wall of one end of the rotating shaft facing the cylinder body is provided with a first rotating shaft annular groove for sleeving a bearing and a second rotating shaft annular groove for movably sleeving a first shaft cover and a second shaft cover; an outer diameter of the rotating shaft > an outer diameter of the first rotating shaft annular groove > an outer diameter of the second rotating shaft annular groove; an inner wall of one end of the rotating shaft cavity facing the cylinder body is provided with a first annular embedding groove for embedding the bearing, a second annular embedding groove for embedding the first shaft cover, and a third annular embedding groove for embedding the second shaft cover; an inner diameter of the rotating shaft cavity < an inner diameter of the first annular embedding groove < an inner diameter of the second annular embedding groove < an inner diameter of the third annular embedding groove; the first shaft cover can seal the rotating shaft cavity, and the second shaft cover can seal the powder cavity; an air cavity is formed between the second shaft cover and the first shaft cover; a first air passage that can communicate with the second annular embedding groove is provided on the bearing seat, and an air hole on the shaft cover corresponding to the position of the first air passage is provided; the first air passage, the air hole on the shaft cover, and the air cavity communicate with each other; a second air passage is further provided on the bearing seat, and an air hole under the shaft cover that can communicate the second air passage and the air cavity is provided on the first shaft cover; the first air passage and the second air passage are respectively connected to an external air pipe through a first quick-connect fitting and a second quick-connect fitting.

[0012] Further, the first shaft cover includes a first shaft cover annular flange that can extend into the first annular embedding groove and press the outer ring of the bearing embedded in the first annular embedding groove, and a first shaft cover annular groove provided on the inner side of the first shaft cover annular flange, and a first shaft cover sleeve hole for sleeving the rotating shaft is provided on a bottom wall of the first shaft cover annular groove.

[0013] Further, a locking nut is further sleeved on the first rotating shaft annular groove, and correspondingly, a thread matching the locking nut is provided on the first rotating shaft annular groove.

[0014] Further, an upper air hole sealing ring groove is further provided on a side of the air hole on the shaft cover of the first shaft cover facing the first air passage, and an upper air hole sealing ring is embedded therein.

[0015] Further, at one end of the first shaft cover facing the air cavity, a first shaft cover sealing embedding groove is provided along the center of the circle; correspondingly, at one end of the second shaft cover facing the air cavity, a second shaft cover sealing embedding groove is provided along the center of the circle; sealing members are respectively embedded in the first shaft cover sealing embedding groove and the second shaft cover sealing embedding groove.

[0016] Further, at one end of the second shaft cover facing the first shaft cover, a second shaft cover annular groove is formed along the center of the circle, and a second shaft cover sealing insert groove is formed on the bottom wall of the second shaft cover annular groove. A second shaft cover sleeve hole for sleeving the rotating shaft is further formed on the bottom wall of the second shaft cover sealing insert groove; an air cavity is formed between the second shaft cover annular groove and the outer end face of the first shaft cover.

[0017] Further, the seal is one of a lip seal, a rotary pantograph seal, and a dry gas seal.

[0018] Further, the inner diameter of the second shaft cover annular groove is smaller than the inner diameter of the second annular insert groove.

[0019] Further, an annular right-angle groove is further formed on the outer side of the second shaft cover, and can be embedded and clamped with an annular right-angle insert groove formed on the inner wall of the cylinder body.

[0020] Further, an annular rotating shaft seat flange and an annular cylinder body flange are respectively arranged on the outer walls of the ports at the connection between the bearing seat and the cylinder body. After the annular rotating shaft seat flange and the annular cylinder body flange abut against each other, an isosceles trapezoidal connecting edge is formed, and fastening is achieved through a hoop.

[0021] The cylinder body and rotating shaft sealing connection mechanism for a powder fusion machine provided by the present invention forms an air cavity through the movable sleeving of the first shaft cover and the second shaft cover with the rotating shaft and the embedding with the bearing seat; and a first channel and an air hole on the shaft cover that can be aligned and communicated, as well as an air hole under the shaft cover and a second channel are configured for the air cavity, so as to input and output air pressure to the air cavity. This mechanism not only has a simple structure and is easy to maintain, can achieve screwless assembly and disassembly, but also has a good sealing effect, will not cause the risk of blockage in the vicinity and outside of the air cavity, and can effectively extend the service life of the powder fusion machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the cylinder body and rotating shaft sealing connection mechanism for a powder fusion machine according to the present invention; Figure 2 is Figure 1 an enlarged view of A in Figure 3 is an exploded cross-sectional view of the cylinder body and rotating shaft sealing connection mechanism for a powder fusion machine according to the present invention; Figure 4 is a schematic structural view of the cylinder body and rotating shaft sealing connection mechanism for a powder fusion machine according to the present invention; Figure 5 is a schematic view of the cylinder body and rotating shaft sealing connection mechanism for a powder fusion machine according to the present invention after being connected to a box body.

[0023] Reference Signs: 1 - Bearing housing, 101 - Rotating shaft cavity, 102 - First annular groove, 103 - Second annular groove, 104 - Third annular groove, 105 - First air passage, 106 - Second air passage, 107 - Annular rotating shaft seat flange; 2 - Cylinder body, 201 - Powder cavity, 202 - Cylinder body annular right - angled groove, 203 - Second rotating shaft annular groove; 3 - Rotating shaft, 301 - First rotating shaft annular groove, 302 - Second rotating shaft annular groove; 4 - First shaft cover, 401 - First shaft cover annular flange, 402 - First shaft cover annular groove, 403 - First shaft cover sleeve hole, 404 - Upper air hole on the shaft cover, 405 - Lower air hole on the shaft cover, 406 - Sealing ring groove for the upper air hole, 407 - Sealing ring for the upper air hole, 408 - First shaft cover sealing groove; 5 - Second shaft cover, 501 - Second shaft cover sealing groove, 502 - Second shaft cover annular groove, 503 - Second shaft cover sleeve hole, 504 - Annular right - angled groove; 6 - Locking nut, 7 - Rotating shaft, 8 - Air cavity, 9 - First quick - release joint, 10 - Second quick - release joint, 11 - Sealing element, 12 - Connecting edge, 13 - Hoop, 14 - Port sealing ring groove, 15 - Sealing ring, 16 - Blade shaft, 17 - Bearing closed chamber, 18 - Box body, 19 - Guide rod, 20 - Linear bearing with round flange, 21 - Lifting lug, 22 - Lifting lug sleeve hole; Detailed implementation mode

[0024] The present invention will be further described in detail below with reference to the drawings and embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0025] As Figures 1 to 3 shown, this solution provides a sealing connection mechanism for the cylinder body and the rotating shaft of a powder fusion machine, including a bearing housing 1 with a rotating shaft cavity 101 and a cylinder body 2 with a powder cavity 201. It is characterized in that a rotating shaft 7 is movably arranged in the rotating shaft cavity 101. The outer wall of one end of the rotating shaft 7 facing the cylinder body 2 is provided with a first rotating shaft annular groove 301 for sleeving a bearing 7 and a second rotating shaft annular groove 302 for movably sleeving a first shaft cover 4 and a second shaft cover 5; the outer diameter of the rotating shaft 3 > the outer diameter of the first rotating shaft annular groove 301 > the outer diameter of the second rotating shaft annular groove 302; On the inner wall of one end of the rotating shaft cavity 101 facing the cylinder body 2, a first annular embedding groove 102 for embedding the bearing 7, a second annular embedding groove 103 for embedding the first shaft cover 4, and a third annular embedding groove 104 for embedding the second shaft cover 5 are provided; the inner diameter of the rotating shaft cavity 101 < the inner diameter of the first annular embedding groove 102 < the inner diameter of the second annular embedding groove 103 < the inner diameter of the third annular embedding groove 104; The first shaft cover 4 can seal one end of the rotating shaft cavity 101, and the second shaft cover 5 can seal one end of the powder cavity 201; an air cavity 8 is formed between the second shaft cover 5 and the first shaft cover 4; On the bearing seat 1, a first air passage 105 communicating with the second annular embedding groove 103 is provided, and an upper air hole 404 on the shaft cover is provided at the position of the first shaft cover 4 corresponding to the first air passage 105; the first air passage 105, the upper air hole 404 on the shaft cover, and the air cavity 8 communicate with each other; On the bearing seat 1, a second air passage 106 is further provided, and a lower air hole 405 on the shaft cover for communicating the second air passage 106 and the air cavity 8 is provided on the first shaft cover 4; The first air passage 105 and the second air passage 106 are respectively connected to an external air pipe through a first quick-connect fitting 9 and a second quick-connect fitting 10.

[0026] In this solution, a first rotating shaft annular groove 301 and a second rotating shaft annular groove 302 are provided on the rotating shaft 3 as installation positions for facilitating the sequential assembly, disassembly, and maintenance of the bearing 7, the first shaft cover 4, and the second shaft cover 5; among them: The bearing 7 is a ball bearing. When it is sleeved with the first rotating shaft annular groove 301 and contacts the bottom wall of the first rotating shaft annular groove 301, its outer ring is exactly embedded by the first annular embedding groove 102, so that the rotating shaft 3 can be stably movably connected in the rotating shaft cavity 101. For the support of the other end of the rotating shaft 3, the same bearing structure can also be used for connection in this embodiment.

[0027] The first shaft cover 4 is movably sleeved on the second rotating shaft annular groove 302 and is quickly connected to the bearing seat 1 under the action of the second annular embedding groove 103; since the outer diameter of the second rotating shaft annular groove 402 is smaller than the outer diameter of the first rotating shaft annular groove 401, the bottom wall of the second rotating shaft annular groove 402 can axially limit the first shaft cover 4; similarly, the first shaft cover 4 can limit the rotating shaft 3 so that it can work stably in the rotating shaft cavity 101.

[0028] The second shaft cover 5 is movably sleeved on the second annular groove 103 and is quickly connected to the bearing seat 1 under the action of the third annular groove 104; an annular right-angle groove 504 is also formed on the outer side of the second shaft cover 5, which can be engaged and clamped with the annular right-angle groove 202 formed on the inner wall of the cylinder body 2. An annular air chamber 8 can be formed between the second shaft cover 5 and the first shaft cover 4 around a part of the outer wall of the second rotating shaft annular groove 203.

[0029] It should be noted that in this embodiment, an annular bearing seat flange 107 and an annular cylinder flange 203 are respectively arranged on the outer walls of the ports at the connection between the bearing seat 1 and the cylinder body 2. After the annular bearing seat flange 107 and the annular cylinder flange 203 are in contact with each other, they form a connecting edge 12 in the shape of an isosceles trapezoid, and are fastened by a hoop 13.

[0030] During operation, by supplying air to the air chamber 8 to make the pressure in the air chamber 8 greater than the pressure in the powder chamber 201, it is realized that the powder in the powder chamber 201 is prevented from penetrating into the air chamber 8 along the blade shaft 16 connected to the rotating shaft 3 during operation, effectively realizing the seal between the cylinder body 2 and the rotating shaft 3.

[0031] Working principle: The air pressure enters the first air passage 105 through the first quick-connect fitting 9, and then enters the air chamber 8 through the air hole 404 on the shaft cover. After the air pressure fills the air chamber 8, an air pressure barrier will be formed in the air chamber 8 to isolate the rotating shaft cavity 101 and the powder chamber 201.

[0032] During operation, it is necessary to ensure that the air pressure value in the air chamber 8 is higher than the working pressure in the powder chamber 201, so as to ensure that the powder in the powder chamber 201 does not leak into the air chamber 8.

[0033] Moreover, since the outer diameter of the blade shaft 16 connected to the end of the rotating shaft 3 is larger than the outer diameter of the adjacent second rotating shaft annular groove 302, and the outer diameter of the second rotating shaft annular groove 302 is smaller than the outer diameter of the first rotating shaft annular groove 301; it can further ensure that the air pressure in the air chamber 8 cannot easily penetrate into the rotating shaft cavity 101 and the powder chamber 201 along the gaps between the first shaft cover 4 and the second shaft cover 5 and the rotating shaft 3, ensuring the stability of the independent operation in the rotating shaft cavity 101 and the powder chamber 201, minimizing the interference of the air flow, and at the same time avoiding the risk of blockage of the exhaust passage.

[0034] It should also be noted that in this embodiment, the second quick-connect fitting 10 can be connected to an air pipe to realize the air pressure circulation in the air chamber 8; and it can also relieve the pressure when the air pressure value in the air chamber 8 exceeds the safety threshold.

[0035] When performing the above operations, by exhausting the air pressure, the powder invading the air cavity 8 in special cases can also be removed, preventing it from returning to the powder cavity 201 and affecting the classification of powder particles.

[0036] As Figure 2 shown, in this embodiment, the first shaft cover 4 includes a first shaft cover annular flange 401 that can extend into the first annular groove 102 and press the outer ring of the bearing 7 embedded in the first annular groove 102, and a first shaft cover annular groove 402 provided inside the first shaft cover annular flange 401. A first shaft cover sleeve hole 403 for sleeving the rotating shaft 3 is provided on the bottom wall of the first shaft cover annular groove 402; Under the limitation of the above structure, when the first shaft cover 4 is sleeved with the rotating shaft 3, its outer side wall will be embedded in the second annular groove 103. As it further enters, its first shaft cover annular flange 401 can extend into the first annular groove 102 and press the outer ring of the bearing 7 embedded in the first annular groove 102. This solution not only realizes the press-fitting limit of the bearing 7 but also forms a bearing sealed chamber 17 between the first shaft cover annular groove 402 and the bearing 7.

[0037] A locking nut 6 is also sleeved on the first rotating shaft annular groove 301. Correspondingly, a thread matching the locking nut 6 is provided on the first rotating shaft annular groove 301.

[0038] By screwing the locking nut 6 with the thread, the bearing 7 is firmly limited in its initial installation position, preventing it from axially shifting relative to the rotating shaft during long-term rotational work.

[0039] It should be noted that in cooperation with the aforementioned bearing sealed chamber 17, a sealed moving space can be provided for the locking nut 6.

[0040] In addition, the locking nut 6 in this embodiment can also be replaced by an elastic retaining ring, that is, an elastic retaining ring is also sleeved on the first rotating shaft annular groove 301 for limiting the outer side of the bearing to prevent it from axially shifting relative to the rotating shaft 3 during long-term rotational work. As an installation method of the elastic retaining ring, a retaining ring groove for embedding the elastic retaining ring can be provided in advance on the outer wall of the first rotating shaft annular groove 301 corresponding to the outer side of the bearing 7.

[0041] As an optimization of this embodiment, an upper air hole sealing ring groove 406 is further provided on the side of the upper air hole 404 on the first shaft cover 4 facing the first air passage 105, and an upper air hole sealing ring 407 is embedded in it to prevent air leakage at the connection between the first air passage 105 and the upper air hole 404 of the shaft cover.

[0042] In this embodiment, in order to ensure that the air holes 404 on the shaft cover can accurately correspond to the first air passage 105, a plurality of guide holes may be opened on the bottom wall of the second annular groove 103, and guide posts corresponding to the guide holes may be provided on the end face of the second shaft cover 5. The precise installation of the first shaft cover 4 is achieved through the cooperation of the two.

[0043] In addition, the first shaft cover 4 and the bottom wall of the second annular groove 103 may be fixedly connected by bolts.

[0044] At one end of the first shaft cover 4 facing the air chamber 8, a first shaft cover sealing groove 408 is opened along the center of the circle; Correspondingly, at one end of the second shaft cover 5 facing the air chamber 8, a second shaft cover sealing groove 501 is opened along the center of the circle; sealing members 11 are respectively embedded in the first shaft cover sealing groove 408 and the second shaft cover sealing groove 501.

[0045] As Figure 3 shown, at one end of the second shaft cover 5 facing the first shaft cover 4 in this embodiment, a second shaft cover annular groove 502 is opened along the center of the circle, and the second shaft cover sealing groove 501 is opened on the bottom wall of the second shaft cover annular groove 502. A second shaft cover sleeve hole 503 for sleeving the rotating shaft 3 is also opened on the bottom wall of the second shaft cover sealing groove 501; an air chamber 8 is formed between the second shaft cover annular groove 502 and the outer end face of the first shaft cover 4.

[0046] In this embodiment, the sealing member 11 is one of a lip seal, a rotary face seal, and a dry gas seal.

[0047] In this embodiment, since the first shaft cover 4 and the second shaft cover 5 are movably connected to the rotating shaft 3, that is, the rotating shaft can freely rotate relative to them. In order to further reduce the penetration of gas in the air chamber 8 to both sides, in this embodiment, sealing members are symmetrically arranged at the shaft joints on both sides of the air chamber to ensure that the air pressure is completely enclosed in the air chamber 8, thereby forming an isolation.

[0048] In this embodiment, the inner diameter of the second shaft cover annular groove 502 is smaller than the inner diameter of the second annular groove 103, so that the end face of the second shaft cover 4 can perform an outer limit on the first shaft cover 4 installed in the second annular groove 103.

[0049] An annular right-angle groove 504 is also opened on the outside of the second shaft cover 5, and it can be clamped with the cylindrical body annular right-angle groove 202 opened on the inner wall of the cylindrical body 2.

[0050] As Figure 3As shown in the figure, in order to facilitate the sealed connection between the bearing housing 1 and the cylinder body 2, an annular rotating shaft seat flange 107 and an annular cylinder body flange 203 are respectively provided on the outer walls of the ports at the connection between the bearing housing 1 and the cylinder body 2. After the annular rotating shaft seat flange 107 and the annular cylinder body flange 203 are in contact with each other, a connecting edge 12 in the shape of an isosceles trapezoid is formed, and fastening is achieved through a hoop 13.

[0051] As an optimization of this embodiment, a port sealing ring groove 14 can also be provided at the port of the bearing housing 1, and a port sealing ring 15 is arranged in the port sealing ring groove 14 to achieve the sealing of the port connection. As Figure 4 and 5 As shown in the figure, as a further optimization of this solution, it further includes a box body 18 for installing the bearing housing 1, and a pair of guide rods 19 are symmetrically arranged on the box body 18, and a round flange linear bearing 20 is sleeved on the guide rods 19; Correspondingly, lifting lugs 21 are symmetrically arranged on the outer wall of the cylinder body 2, and a lug sleeve hole 22 capable of sleeving the guide rod 19 is formed in the lifting lugs 21. After the lug sleeve hole 22 and the guide rod 19 are sleeved, they can be connected to the round flange linear bearing 20.

[0052] As a specific embodiment of this solution, the guide rod 19 is higher than the cylinder body 2.

[0053] Through the above structure, the cylinder body 2 can be quickly and accurately assembled with the bearing housing 1.

[0054] The above is only to illustrate the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. The cylinder and rotating shaft sealing connection mechanism for a powder fusion machine, comprising a bearing seat (1) having a rotating shaft cavity (101) and a cylinder (2) having a powder cavity (201), characterized in that, A rotating shaft (7) is movably arranged in the rotating shaft cavity (101). An outer wall of one end of the rotating shaft (7) facing the cylinder body (2) is provided with a first rotating shaft annular groove (301) for sleeving a bearing (7), and a second rotating shaft annular groove (302) for movably sleeving a first shaft cover (4) and a second shaft cover (5); an outer diameter of the rotating shaft (3) > an outer diameter of the first rotating shaft annular groove (301) > an outer diameter of the second rotating shaft annular groove (302); An inner wall of one end of the rotating shaft cavity (101) facing the cylinder body (2) is provided with a first annular embedding groove (102) for embedding the bearing (7), a second annular embedding groove (103) for embedding the first shaft cover (4), and a third annular embedding groove (104) for embedding the second shaft cover (5); an inner diameter of the rotating shaft cavity (101) < an inner diameter of the first annular embedding groove (102) < an inner diameter of the second annular embedding groove (103) < an inner diameter of the third annular embedding groove (104); The first shaft cover (4) can seal the rotating shaft cavity (101), and the second shaft cover (5) can seal the powder cavity (201); an air cavity (8) is formed between the second shaft cover (5) and the first shaft cover (4); A first air passage (105) communicating with the second annular embedding groove (103) is formed in the bearing seat (1), and an upper air hole (404) of the shaft cover is formed in the first shaft cover (4) corresponding to the position of the first air passage (105); the first air passage (105), the upper air hole (404) of the shaft cover, and the air cavity (8) communicate with each other; A second air passage (106) is further formed in the bearing seat (1), and a lower air hole (405) of the shaft cover for communicating the second air passage (106) and the air cavity (8) is formed in the first shaft cover (4).

2. The cylinder and rotating shaft sealing connection mechanism for a powder fusion machine according to claim 1, characterized in that, The first shaft cover (4) includes a first shaft cover annular flange (401) capable of extending into the first annular embedding groove (102) and pressing an outer ring of the bearing (7) embedded in the first annular embedding groove (102), and a first shaft cover annular groove (402) arranged inside the first shaft cover annular flange (401). A first shaft cover sleeve hole (403) for sleeving the rotating shaft (3) is formed in a bottom wall of the first shaft cover annular groove (402).

3. The cylinder and rotating shaft sealing connection mechanism for a powder fusion machine according to claim 1 or 2, characterized in that A locking nut (6) is further sleeved on the first rotating shaft annular groove (301). Correspondingly, a thread matching the locking nut (6) is formed in the first rotating shaft annular groove (301).

4. The cylinder and rotating shaft sealing connection mechanism for the powder fusion machine according to claim 1 or 2, characterized in that, An upper air hole sealing ring groove (406) is further formed on a side of the upper air hole (404) of the first shaft cover (4) facing the first air passage (105), and an upper air hole sealing ring (407) is embedded therein.

5. The cylinder and rotating shaft sealing connection mechanism for the powder fusion machine according to claim 4, characterized in that, One end of the first shaft cover (4) facing the air cavity (8) is provided with a first shaft cover sealing embedding groove (408) along the center of a circle; Correspondingly, at one end of the second shaft cover (5) facing the air chamber (8), a second shaft cover sealing groove (501) is provided along the center of the circle; sealing members (11) are respectively embedded in the first shaft cover sealing groove (408) and the second shaft cover sealing groove (501).

6. The cylinder and rotating shaft sealing connection mechanism for a powder fusion machine according to claim 5, characterized in that, At one end of the second shaft cover (5) facing the first shaft cover (4), a second shaft cover annular groove (502) is provided along the center of the circle, and the second shaft cover sealing groove (501) is provided on the bottom wall of the second shaft cover annular groove (502). A second shaft cover sleeve hole (503) for sleeving the rotating shaft (3) is further provided on the bottom wall of the second shaft cover sealing groove (501); an air chamber (8) is formed between the second shaft cover annular groove (502) and the outer end face of the first shaft cover (4).

7. The cylinder and rotating shaft sealing connection mechanism for the powder fusion machine according to claim 5, characterized in that, The sealing member (11) is one of a lip seal, a rotary lip seal, and a dry gas seal.

8. The cylinder and rotating shaft sealing connection mechanism for the powder fusion machine according to claim 6, characterized in that, The inner diameter of the second shaft cover annular groove (502) is smaller than the inner diameter of the second annular groove (103).

9. The barrel and rotating shaft sealing connection mechanism for the powder fusion machine according to claim 1, characterized in that, An annular right-angle groove (504) is further provided on the outer side of the second shaft cover (5), and can be clamped with an annular right-angle groove (202) provided on the inner wall of the cylinder body (2).

10. The barrel and rotating shaft sealing connection mechanism for a powder fusion machine according to claim 9, characterized in that, An annular rotating shaft seat flange (107) and an annular cylinder body flange (203) are respectively provided on the outer walls of the ports at the connection between the bearing seat (1) and the cylinder body (2). After the annular rotating shaft seat flange (107) and the annular cylinder body flange (203) are in contact with each other, an isosceles trapezoidal connecting edge (12) is formed, and fastening is achieved through a hoop (13).

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