A dust-proof structure for a powder feeding device and an electron beam selective melting powder feeding device

Abstract

The present invention provides a dustproof structure of a powder feeding device and an electron beam selective melting powder feeding device, and relates to the technical field of dustproof structures of electron beam 3D printing powder feeding devices. The dustproof structure includes a slot shaft, a slot shaft seat, two bearings and two first dustproof mechanisms; the slot shaft includes a first shaft portion arranged inside the slot shaft seat and two second shaft portions extending outward, and a step is formed at the connection between the first shaft portion and the second shaft portion; each second shaft portion has a first end and a second end, each first end is located in the slot shaft seat, and the outer wall of the middle area of ​​each second shaft portion is sleeved with a bearing, and each second shaft portion and the corresponding bearing and the first shaft portion and the slot shaft seat form a first chamber; each first dustproof mechanism includes a first filler filled in the corresponding first chamber. By setting the first dustproof mechanism, at least dust near one side of the powder falling channel can be prevented from entering the bearing, effectively blocking dust and smoke, and reducing the damage rate of the bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of dustproof structures of electron beam 3D printing powder feeding devices, and in particular to a dustproof structure of a powder feeding device and an electron beam selective melting powder feeding device. Background Art

[0002] Electron beam selective melting equipment has the characteristics of high temperature, high dust, and high vacuum. Metal vapor will also be generated during the printing process, which poses a great challenge to the various moving mechanisms placed inside the vacuum chamber, especially for the bearings supporting the rotation of the slot shaft in the quantitative powder feeding device.

[0003] Rotating slot shaft powder feeding is a new type of powder feeding method for electron beam selective melting. It uses a servo motor placed outside the vacuum chamber to drive the slot shaft inside the vacuum chamber to rotate through a vacuum penetration. The slot shaft is placed at the bottom of the powder storage bin and can quantitatively bring out metal powder through rotation. Since the drive and control units of this structure are outside the vacuum chamber, they will not be affected by the high temperature and high dust environment inside the vacuum chamber, which effectively improves its stability.

[0004] However, the rotating slot shaft is supported by bearings at both ends, and the bearings cannot be placed outside the vacuum chamber. In addition, the slot shaft is located at the bottom of the powder storage bin, and plays the function of powder separation and powder delivery. During operation, a large amount of metal dust with a diameter of 20μm to 100μm will directly contact the bearings along the slot shaft.

[0005] Therefore, since the bearing is located close to the printing area and the temperature is high, during operation, the outward end of the bearing is affected by metal vapor and high temperature, and the inward end of the bearing is close to the powder dropping channel and is affected by a large amount of metal powder on the slot shaft.

[0006] Although bearings with dust covers can be used, since the dust is fine and has a high solubility, it is impossible to prevent the dust from entering the bearing, and damage to the bearing is inevitable. Once "grinding" or jamming occurs, it will have a great impact on the powder removal mechanism and even the entire equipment, so the protection of the bearing is particularly important.

[0007] In view of this, this application is hereby filed. Summary of the invention

[0008] One of the purposes of the present invention is to provide a dust-proof structure for a powder feeding device, which can at least prevent dust near one side of the powder falling channel from entering the interior of the bearing, effectively block dust and smoke, and reduce the damage rate of the bearing.

[0009] A second object of the present invention is to provide an electron beam selective melting powder feeding device having the above-mentioned dust-proof structure.

[0010] The present invention can be implemented like this:

[0011] In a first aspect, the present invention provides a dustproof structure of a powder feeding device, comprising a slotted shaft, a slotted shaft seat, two bearings and two first dustproof mechanisms;

[0012] The slot shaft comprises a first shaft portion arranged inside the slot shaft seat and two second shaft portions connected to both ends of the first shaft portion and extending outwardly along the axial direction of the slot shaft, wherein the outer diameter of the first shaft portion is greater than the outer diameter of the second shaft portion so that a step is formed at the connection between the first shaft portion and the second shaft portion;

[0013] Each second shaft portion has a first end connected to the first shaft portion and a second end away from the first shaft portion, each first end is located in the slot shaft seat, and a bearing is sleeved on the outer wall of the middle area between the first end and the second end of each second shaft portion, and each second shaft portion and the bearing disposed on the second shaft portion and the first shaft portion and the slot shaft seat form a first chamber;

[0014] Each first dustproof mechanism includes a first filler, and the first filler of each first dustproof mechanism is filled in the two first chambers respectively.

[0015] In an optional embodiment, the first filler is ceramic rope.

[0016] In an optional embodiment, each first dust-proof mechanism further includes an inner sleeve;

[0017] The inner sleeve includes a first sleeve area arranged along the axial direction of the groove shaft and a second sleeve area arranged along the radial direction of the groove shaft. The first sleeve area is sleeved on the outer wall of the second shaft portion and two ends of the first sleeve area are respectively abutted against the bearing and the first shaft portion, two ends of the second sleeve area are respectively abutted against the inner wall of the groove shaft seat and the first sleeve area is used to abut one end of the first shaft portion, and the first filler is filled between the first sleeve area, the second sleeve area, the bearing and the groove shaft seat.

[0018] In an optional embodiment, there is a gap between the end face of the grooved shaft seat facing each bearing and the bearing, and each first dustproof mechanism also includes an inner pressure cover. In the same first dustproof mechanism, the inner pressure cover simultaneously abuts against at least a portion of the outer wall of the bearing in the radial direction, the end face of the grooved shaft seat facing the bearing, and the first filler in the first chamber.

[0019] In an optional embodiment, the dustproof structure further includes two second dustproof mechanisms, and the two second dustproof mechanisms are respectively and correspondingly arranged on one side of the two bearings away from the first dustproof mechanism;

[0020] Each second dustproof mechanism comprises an outer pressure cover and a second filler;

[0021] In the same second dustproof mechanism, the outer pressure cover includes a first pressure cover area arranged along the radial direction of the groove axis and a second pressure cover area arranged along the axial direction of the groove axis, the two ends of the first pressure cover area are respectively connected to the outer wall of the second shaft portion and one end of the second pressure cover area, the other end of the second pressure cover area is abutted against the inner pressure cover, and a second chamber for filling the second filler is formed between the first pressure cover area, the second pressure cover area, the second shaft portion and the bearing.

[0022] In an alternative embodiment, the second filler is ceramic rope.

[0023] In an optional embodiment, each second dustproof mechanism also includes an outer sleeve. In the same second dustproof mechanism, the outer sleeve is sleeved on the outer wall of the second end of the second shaft portion, and one end of the outer sleeve abuts the bearing. The outer pressure cover is sleeved on the outside of the outer sleeve, and a second chamber is formed between the outer sleeve, the outer pressure cover and the bearing.

[0024] In an optional embodiment, each second dustproof mechanism also includes an outer spacer sleeve. In the same second dustproof mechanism, the outer spacer sleeve is simultaneously sleeved on the outer sleeve and part of the outer wall of the bearing, and the two axial side surfaces of the outer sleeve along the groove axis respectively abut against the second pressure cover area and the inner pressure cover.

[0025] In an optional embodiment, the dustproof structure also includes a drive sprocket for driving the slot shaft to rotate, the drive sprocket is arranged at the second end of any one of the second shaft portions, and one end of the drive sprocket abuts against the outer sleeve of the second shaft portion and the first pressure cover area.

[0026] In an optional embodiment, the dustproof structure also includes two slot shaft end covers, and the two slot shaft end covers are respectively arranged on the end faces of the second ends of the two second shaft portion slot shafts.

[0027] In a second aspect, the present invention further provides an electron beam selective melting powder feeding device, which includes a dust-proof structure as described in any of the aforementioned embodiments.

[0028] The beneficial effects of this application include:

[0029] The present application forms two first chambers corresponding to the two first dust-proof mechanisms between the first shaft portion of the slot shaft, the slot shaft seat, the two second shaft portions of the slot shaft and the two bearings, and fills the first chambers with a first filler, thereby at least preventing dust or smoke near the powder drop channel from entering the bearings, thereby reducing the damage rate of the bearings. The structure is low in cost and easy to replace, and can provide good protection for the bearings of the slot shaft powder feeding device, thereby extending the service life of the bearings, reducing the number of replacements, and improving the stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure of the dustproof structure provided in an embodiment of the present application at a first viewing angle;

[0032] Figure 2 A schematic structural diagram of the dustproof structure provided in an embodiment of the present application at a second viewing angle.

[0033] Icon: A1-inner sleeve; A2-first filler; A3-groove shaft seat; A4-inner pressure cover; A5-outer spacer; A6-outer pressure cover; A7-second filler; A8-outer sleeve; A9-groove shaft; A10-bearing; A11-drive sprocket; A12-groove shaft end cover. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the term "horizontal" and the like do not mean that the component is required to be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Example

[0041] Please refer to Figure 1 and Figure 2 This embodiment provides an electron beam selective melting powder feeding device, which has the following dustproof structure. It is worth noting that other structures of the electron beam selective melting powder feeding device can refer to the prior art, and will not be described in detail here.

[0042] The dust-proof structure of the powder feeding device provided in this embodiment includes a groove shaft A9, a groove shaft seat A3, two bearings A10 and two first dust-proof mechanisms.

[0043] The slot shaft A9 includes a first shaft portion disposed inside the slot shaft seat A3 and two second shaft portions connected to both ends of the first shaft portion and extending outward along the axial direction of the slot shaft. The outer diameter of the first shaft portion is greater than the outer diameter of the second shaft portion so that a step is formed at the connection between the first shaft portion and the second shaft portion.

[0044] Each second shaft portion has a first end connected to the first shaft portion and a second end away from the first shaft portion, the first end is close to the powder falling channel, and the second end is away from the powder falling channel.

[0045] Each first end is located in the slotted shaft seat A3, and a bearing is sleeved on the outer wall of the middle area between the first end and the second end of each second shaft portion, and two first chambers corresponding to the two first dustproof mechanisms are formed between the first shaft portion, the slotted shaft seat A3, the two second shaft portions, and the two bearings A10. That is, each second shaft portion and the bearing A10 disposed on the second shaft portion, as well as the first shaft portion and the slotted shaft seat A3, form a first chamber.

[0046] Each first dust-proof mechanism includes a first filler A2, and the first filler of each first dust-proof mechanism is filled in the corresponding first chamber respectively.

[0047] In the present application, the first filler A2 may be a ceramic rope. Using the ceramic rope as the first filler A2 can improve the high temperature resistance of the dustproof structure.

[0048] Furthermore, each first dustproof mechanism further includes an inner sleeve A1. In the same first dustproof mechanism, the inner sleeve A1 is sleeved on the outer wall of the first end of the second shaft portion, and the left and right ends of the inner sleeve A1 respectively abut against the surface of the side of the bearing A10 facing the first shaft portion and the surface of the side of the first shaft portion facing the bearing.

[0049] For reference, the inner sleeve A1 includes a first sleeve area arranged axially (transversely) along the groove axis A9 and a second sleeve area arranged radially (vertically) along the groove axis A9. The first sleeve area is sleeved on the outer wall of the second shaft portion and the left and right ends of the first sleeve area respectively abut against the surface of the bearing A10 on the side facing the first shaft portion and the surface of the first shaft portion on the side facing the bearing.

[0050] The upper and lower ends of the second sleeve area respectively abut against the inner wall of the slot shaft seat A3 and the first sleeve area for abutting against one end of the first shaft portion, and the first filler A2 is filled between the first sleeve area, the second sleeve area, the bearing A10 and the slot shaft seat A3.

[0051] In an optional embodiment, there is a gap between the end surface of the slotted shaft seat A3 facing one end of each bearing A10 and the bearing A10, and in this case, each first dustproof mechanism further includes an inner pressure cover A4. In the same first dustproof mechanism, the inner pressure cover A4 simultaneously abuts against at least part of the outer wall of the bearing A10 in the radial direction, the end surface of the slotted shaft seat A3 facing one end of the bearing A10, and the first filler A2 in the first chamber.

[0052] It can be understood that: the inner pressure cover A4 can limit and position the bearing A10 and the inner sleeve A1 in the radial direction to prevent the bearing A10 and the inner sleeve A1 from moving in the radial direction, and on the other hand, it can limit and position the groove shaft seat A3 and the first filler A2 in the horizontal direction.

[0053] The cooperation of the inner sleeve A1, the grooved shaft seat A3, the inner pressure cover A4 and the first filler A2 can effectively prevent the metal powder on the right side of the bearing A10 (close to the powder falling channel) from entering the interior of the bearing A10.

[0054] In order to further improve the dustproof effect, the dustproof structure provided in this embodiment also includes two second dustproof mechanisms, and the two second dustproof mechanisms are respectively arranged on the side of the two bearings A10 away from the first dustproof mechanism.

[0055] Each second dustproof mechanism includes an outer pressure cover A6 and a second filler A7.

[0056] In the same second dustproof mechanism, the outer pressure cover A6 includes a first pressure cover area arranged along the radial direction of the groove axis A9 and a second pressure cover area arranged along the axial direction of the groove axis A9, the two ends (upper and lower ends) of the first pressure cover area are respectively connected to the outer wall of the second shaft portion and one end of the second pressure cover area, and the other end of the second pressure cover area is abutted against the end face of the inner pressure cover A4 away from the first shaft portion, and a second chamber for filling the second filler A7 is formed between the first pressure cover area, the second pressure cover area, the second shaft portion and the bearing A10.

[0057] Similarly, the second filler A7 may also be a ceramic rope.

[0058] Furthermore, each second dustproof mechanism also includes an outer sleeve A8. In the same second dustproof mechanism, the outer sleeve A8 is sleeved on the outer wall of the second end of the second shaft portion, and one end of the outer sleeve A8 abuts against the surface of the bearing A10 on the side away from the first shaft portion. The outer pressure cover A6 is sleeved on the outside of the outer sleeve A8, and the above-mentioned second chamber is formed between the outer sleeve A8, the outer pressure cover A6 and the bearing A10.

[0059] Furthermore, each second dustproof mechanism also includes an outer spacer sleeve A5. In the same second dustproof mechanism, the second pressure cover area of ​​the outer pressure cover A6 is not directly abutted against the inner pressure cover A4. The outer spacer sleeve A5 is simultaneously sleeved on the outer shaft sleeve A8 and part of the outer wall of the bearing A10, and the two axial side surfaces of the outer shaft sleeve A8 along the groove axis A9 are respectively abutted against the second pressure cover area and the inner pressure cover A4.

[0060] The outer spacer sleeve A5, the outer shaft sleeve A8, the outer pressure cover A6 and the second filler A7 cooperate to effectively prevent the high-temperature metal vapor on the side of the bearing A10 away from the powder dropping channel from entering the interior of the bearing A10.

[0061] In an optional implementation manner, the bearing A10 in this embodiment includes a bearing inner ring and a bearing outer ring, the end of the outer sleeve A8 close to the first shaft portion and the end of the first sleeve area of ​​the inner sleeve A1 away from the first shaft portion are both abutted against the bearing inner ring, and the outer spacer A5 and the inner pressure cover A4 are both abutted against the bearing outer ring.

[0062] The inner pressure cover A4, the outer spacer A5 and the outer ring of the bearing are axially pressed by the outer pressure cover A6 to prevent the above components from axial movement.

[0063] The dustproof structure provided in this embodiment also includes a driving sprocket A11 for driving the groove shaft A9 to rotate. The driving sprocket A11 is arranged at the second end of any one of the second shaft portions, and one end of the driving sprocket A11 abuts against the outer sleeve A8 of the second shaft portion and the first pressure cover area.

[0064] Furthermore, the above-mentioned dust-proof structure also includes two slotted shaft end covers A12, and the two slotted shaft end covers A12 are respectively arranged on the end faces of the second ends of the two second shaft portions to compress the driving sprocket A11, the outer sleeve A8, the bearing inner ring and the inner sleeve A1 in the axial direction to prevent the above-mentioned components from axial movement.

[0065] In this embodiment, the dustproof structure also includes fasteners, which are used to press the slot shaft end cover A12, the outer sleeve A8, the bearing A10, the inner sleeve A1 and the step end surface of the slot shaft A9.

[0066] The assembly and working process of the dust-proof structure of the above powder feeding device can refer to:

[0067] Taking the half-length slot shaft A9 as an example, during installation, first insert the first shaft portion of the slot shaft A9 into the slot shaft seat A3, so that the step end face of the slot shaft A9 is about 18 mm away from the end face of the slot shaft seat A3 (it can also be set to other distances as needed).

[0068] The inner ceramic rope (first filler A2) is wound around the root of the inner sleeve A1 (for example, three turns). Preferably, the two ends of the ceramic rope at least partially overlap to prevent it from loosening and falling off.

[0069] Insert the inner sleeve A1 into the first end of the second shaft portion of the slot shaft A9 and close to the step end surface. Insert the inner pressure cover A4 into the sub-mouth of the slot shaft seat A3 (the gap between the slot shaft seat A3 and the bearing A10) to compress the ceramic rope.

[0070] The bearing A10 is sleeved in the middle area of ​​the second shaft portion of the slot shaft A9, and the outer ring of the bearing abuts against the inner pressure cover A4.

[0071] The outer spacer A5 is put on the outer wall of the outer ring of the bearing, and the outer sleeve A8 is put on the outer wall of the second end of the second shaft portion of the slot shaft A9 and close to the inner ring of the bearing. The outer ceramic rope (the second filler A7, for example, can be wound three times) is wound on the outer sleeve A8 near the outer spacer A5. Similarly, preferably, the two ends of the ceramic rope at least partially overlap to prevent it from loosening and falling off.

[0072] Then, an outer pressure cover A6 is sleeved on the outer side of the second filler A7, and the outer pressure cover A6, the outer spacer A5, the inner pressure cover A4 and the groove shaft seat A3 are pressed tightly with screws.

[0073] After the flat key is installed on the second shaft portion of the groove shaft A9, the driving sprocket A11 is inserted into the second end of the second shaft portion, and the end face of the sprocket is close to the end face of the outer sleeve A8.

[0074] Install the slot shaft end cover A12 on the outside of the driving sprocket A11, and use screws to tighten the slot shaft end cover A12, outer sleeve A8, bearing inner ring, inner sleeve A1 and the stepped end surface of the slot shaft A9. At this time, the assembly of one end of the slot shaft A9 is completed.

[0075] Except that the drive sprocket A11 is not installed on the other end of the slot shaft A9, the remaining installation steps are the same as above.

[0076] During operation, the slot shaft end cover A12, the driving sprocket A11, the outer shaft sleeve A8, the bearing inner ring, and the inner shaft sleeve A1 rotate together with the slot shaft A9; the outer pressure cover A6, the outer spacer A5, the bearing outer ring, the inner pressure cover A4 and the slot shaft seat A3 are fixed.

[0077] In summary, the present application utilizes ceramic rope as a sealing filler. At the inner end of the bearing A10, that is, close to the powder dropping channel, a first chamber for placing the ceramic rope (first filler A2) is formed by an inner sleeve A1, a grooved shaft seat A3 and an inner pressure cover A4. The ceramic rope is spirally filled into the first chamber to prevent metal powder from entering the interior of the bearing A10.

[0078] At the outer end of the bearing A10, the outer spacer A5, the outer shaft sleeve A8 and the outer pressure cover A6 together form a second chamber for placing the ceramic rope (second filler A7). The outer ceramic rope is spirally filled into the second chamber to prevent high-temperature metal vapor from entering the interior of the bearing A10.

[0079] The inner sleeve A1, the outer sleeve A8, the inner ring of the bearing and the driving sprocket A11 are pressed by the slotted shaft end cover A12 to prevent the above components from axial movement. The inner pressure cover A4, the outer spacer A5 and the outer ring of the bearing are pressed by the outer pressure cover A6 to prevent the above components from axial movement.

[0080] The present application seals the inner side, outer side and both ends of the bearing A10 at the same time, and uses ceramic rope as a sealing filler to effectively prevent dust and smoke from entering the interior of the bearing A10. Moreover, it can withstand the influence of high temperature environment, has low cost and is easy to replace. The dustproof structure can play a good protective role for the bearing A10 of the slot shaft A9 type powder feeding device, extend the service life of the bearing A10, reduce the number of replacements, and improve the stability of the equipment.

[0081] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A dust-proof structure for a powder feeding device, characterized in that: It includes a grooved shaft, a grooved shaft seat, two bearings and two first dust-proof mechanisms; The slot shaft comprises a first shaft portion arranged inside the slot shaft seat and two second shaft portions connected to both ends of the first shaft portion and extending outwardly along the axial direction of the slot shaft, wherein the outer diameter of the first shaft portion is greater than the outer diameter of the second shaft portion so that a step is formed at the connection between the first shaft portion and the second shaft portion; Each of the second shaft portions has a first end connected to the first shaft portion and a second end away from the first shaft portion, each of the first ends is located in the slot shaft seat, an outer wall of the middle area between the first end and the second end of each of the second shaft portions is sleeved with one of the bearings, and each of the second shaft portions and the bearings disposed on the second shaft portions and the first shaft portion and the slot shaft seat form a first chamber; Each of the first dust-proof mechanisms includes a first filler, and the first filler of each of the first dust-proof mechanisms is filled in two of the first chambers respectively; Each of the first dustproof mechanisms further includes an inner sleeve; the inner sleeve includes a first sleeve area arranged along the axial direction of the slot shaft and a second sleeve area arranged along the radial direction of the slot shaft, the first sleeve area is sleeved on the outer wall of the second shaft portion and the two ends of the first sleeve area are respectively abutted against the bearing and the first shaft portion, the two ends of the second sleeve area are respectively abutted against the inner wall of the slot shaft seat and the first sleeve area is used to abut against one end of the first shaft portion, the first filler is filled between the first sleeve area, the second sleeve area, the bearing and the slot shaft seat; the first filler is a ceramic rope; There is a gap between the end surface of the grooved shaft seat facing one end of each bearing and the bearing, and each of the first dust-proof mechanisms further includes an inner pressure cover. In the same first dust-proof mechanism, the inner pressure cover simultaneously abuts against at least a portion of the outer wall of the bearing in the radial direction, the end surface of the grooved shaft seat facing one end of the bearing, and the first filler in the first chamber; The dustproof structure further includes two second dustproof mechanisms, and the two second dustproof mechanisms are respectively and correspondingly arranged on one side of the two bearings away from the first dustproof mechanism; each of the second dustproof mechanisms includes an outer pressure cover and a second filler; In the same second dustproof mechanism, the outer gland includes a first gland area arranged along the radial direction of the groove shaft and a second gland area arranged along the axial direction of the groove shaft, two ends of the first gland area are respectively connected to the outer wall of the second shaft portion and one end of the second gland area, the other end of the second gland area abuts against the inner gland, and a second chamber for filling the second filler is formed between the first gland area, the second gland area, the second shaft portion and the bearing; Each of the second dustproof mechanisms further includes an outer sleeve. In the same second dustproof mechanism, the outer sleeve is sleeved on the outer wall of the second end of the second shaft portion, and one end of the outer sleeve abuts against the bearing. The outer pressure cover is sleeved on the outer side of the outer sleeve, and the second chamber is formed between the outer sleeve, the outer pressure cover and the bearing. Each of the second dustproof mechanisms further includes an outer spacer sleeve. In the same second dustproof mechanism, the outer spacer sleeve is simultaneously sleeved on the outer sleeve and a portion of the outer wall of the bearing, and two side surfaces of the outer sleeve along the axial direction of the groove shaft are respectively in contact with the second gland area and the inner gland; The dustproof structure further comprises a driving sprocket for driving the grooved shaft to rotate, wherein the driving sprocket is arranged at the second end of any one of the second shaft portions, and one end of the driving sprocket abuts against the outer sleeve of the second shaft portion and the first gland area; The dustproof structure further comprises two slotted shaft end covers, and the two slotted shaft end covers are respectively arranged on the end surfaces of the second ends of the two second shaft portions; The dustproof structure also includes a fastener, which is used to press the slot shaft end cover, the outer sleeve, the bearing, the inner sleeve and the step end surface of the slot shaft.

2. The dustproof structure according to claim 1, characterized in that: The second filler is ceramic rope.

3. An electron beam selective melting powder feeding device, characterized in that: The invention comprises a dustproof structure as described in any one of claims 1 to 2.

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