A powder cleaning device for an additive printing apparatus

Abstract

The present application relates to the technical field of powder cleaning, and particularly relates to a powder cleaning device for additive printing equipment, which comprises a main shell, a sealing cylinder, a positioning mechanism and a jet mechanism. The main shell is internally provided with a sealing bin, and the side wall of the sealing bin is provided with a bin opening. The sealing cylinder is detachably installed with the sealing bin through the bin opening. The bottom of the sealing bin is provided with an opening for discharging powder. The sealing cylinder is internally provided with a slidable piston. The positioning mechanism comprises a clamping assembly and a vibrating assembly. In the powder cleaning stage, the sealing cylinder is turned over to an inverted state, the piston slides to scrape off the powder on the side wall, the sealing cylinder is turned over to a normal state, the piston loosens the caked powder under the action of the vibrating assembly, the sealing cylinder is turned over to the inverted state again, the jet mechanism removes the powder on the piston, and the sealing cylinder is turned over to the normal state again in the reverse direction, and the jet mechanism removes the residual powder in the sealing cylinder. Therefore, not only is the automatic cleaning realized, but also the problem of incomplete cleaning of caked powder is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of powder cleaning, in particular to a powder cleaning device for additive printing equipment. BACKGROUND

[0002] Powder melting metal additive manufacturing (also known as metal 3D printing) is an advanced manufacturing technology that builds complex three-dimensional parts by layering melting or sintering metal powder. This technology breaks through the limitations of traditional processing methods and can manufacture complex geometric structures and highly customized parts, with wide application in aerospace, medical devices, automobile manufacturing, etc.

[0003] After completing the printing job, the unmelted powder remaining in the printing cylinder must be thoroughly cleaned to ensure the quality of the next printing and the stability of the equipment operation. In the prior art, a powder bed melting metal 3D printing part internal powder removal device is disclosed in Chinese Patent No. CN215615101U, which uses manual operation combined with a glove box for cleaning.

[0004] However, due to the high temperature effect during printing, not only in the printing area, but also in the surrounding non-printing area, resulting in some powder slightly clumping in the cylinder inner wall and bottom; at the same time, the upper layer of powder accumulated for a long time exerts pressure on the lower layer of powder under the action of gravity, further aggravating the clumping phenomenon of the powder. Manual cleaning with a glove box cannot completely remove the clumped powder attached to the inner wall and bottom of the cylinder, further increasing the difficulty of cleaning work. SUMMARY

[0005] Therefore, it is necessary to provide a powder cleaning device for additive printing equipment to solve the problem of ineffective cleaning of clumped powder in the current powder cleaning method.

[0006] The above-mentioned purpose is achieved by the following technical solutions:

[0007] A powder cleaning device for additive printing equipment, comprising:

[0008] A main housing is provided with a sealed bin inside, and a bin opening is formed in the side wall of the sealed bin; an opening is provided at the bottom of the sealed bin, which is used to discharge powder;

[0009] A sealed cylinder is detachably placed in the sealed bin through the bin opening, and the sealed cylinder can be flipped around the direction perpendicular to its central axis; a piston is arranged in the sealed cylinder, which can slide along the central axis direction of the sealed cylinder;

[0010] A positioning mechanism, comprising a clamping assembly for clamping and fixing the sealing cylinder and a vibrating assembly for loosening the caked powder on the piston surface;

[0011] A jet mechanism arranged in the sealing bin for blowing off the powder; in the powder cleaning stage, the sealing cylinder is turned upside down, the piston slides along the central axis of the sealing cylinder to scrape off the powder on the side wall of the sealing cylinder; the sealing cylinder is reversely turned to the upright state, the piston loosens the caked powder under the action of the vibrating assembly; the sealing cylinder is turned upside down again, the jet mechanism removes the powder on the piston; the sealing cylinder is reversely turned to the upright state again, and the jet mechanism removes the residual powder in the sealing cylinder.

[0012] Further, a driving mechanism is further included, which comprises a power assembly and a displacement housing, the clamping assembly and the vibrating assembly are arranged inside the displacement housing, and the sealing cylinder is detachably connected with the displacement housing; the power assembly is used to drive the displacement housing, the clamping assembly, the vibrating assembly and the sealing cylinder to be synchronously turned.

[0013] Further, the clamping assembly comprises two sets of clamping units, which are symmetrically arranged in the direction of the central axis of the sealing cylinder; each set of the clamping units comprises a first clamping plate, a second clamping plate, a first supporting plate, a second supporting plate, a cylinder, a guide rail, a first bracket and a second bracket; the guide rail is fixedly connected with the displacement housing, the first bracket is slidably connected with the guide rail, and the second bracket is slidably connected with the guide rail; the first clamping plate is fixedly connected with the first supporting plate, and the first supporting plate is fixedly connected with the first bracket; the second clamping plate is fixedly connected with the second supporting plate, and the second supporting plate is fixedly connected with the second bracket; each set of the clamping units further comprises a driving source, which is used to drive the first supporting plate and the second supporting plate to relatively slide.

[0014] Further, the driving source comprises a cylinder and a damping unit, the cylinder is used to make the first supporting plate and the second supporting plate approach or move away from each other in the extension direction of the guide rail, and the damping unit is used to control the motion timing of the first supporting plate and the second supporting plate.

[0015] Further, the damping unit comprises an intermediate plate, at least one set of first tension springs and at least one set of second tension springs; the intermediate plate is fixedly connected with the guide rail, one end of the first tension spring is fixedly connected with the first clamping plate, and the other end of the first tension spring is fixedly connected with the intermediate plate; one end of the second tension spring is fixedly connected with the second clamping plate, and the other end of the second tension spring is fixedly connected with the intermediate plate; the elastic force of the first tension spring is greater than that of the second tension spring.

[0016] Further, the damping unit further comprises a limiting rod, one end of the limiting rod is fixedly connected with the medium plate, and the other end of the limiting rod is slidably connected with the second clamping plate, and the limiting rod is used for limiting the stretching displacement of the second tension spring in the central axis direction of the limiting rod.

[0017] Further, the vibration assembly comprises a single-face corrugated plate, the single-face corrugated plate is arranged at the bottom of the piston, the surface of the second clamping plate is provided with a corrugated structure, and the corrugated structure is in sliding fit with the single-face corrugated plate when the second clamping plate slides in the extension direction of the guide rail, so that the piston vibrates.

[0018] Further, the positioning mechanism further comprises a linkage unit, the linkage unit is used for controlling the jetting mechanism to jet the air flow into the sealing cylinder when the second clamping plate slides in the extension direction of the guide rail.

[0019] Further, the linkage unit comprises an insertion plate and a ventilation block, the insertion plate and the ventilation block are in sliding fit, the insertion plate is fixedly connected with the second clamping plate, the ventilation block is slidably connected with the piston, and a ventilation groove is formed between the ventilation block and the bottom end of the piston, the ventilation groove communicates the inside and outside environments of the sealing cylinder, and when the insertion plate slides towards the direction close to or away from the ventilation block, the ventilation block can slide along the central axis direction of the sealing cylinder to open or close the ventilation groove.

[0020] Further, each group of the clamping units further comprises a top block, the inner walls on the two sides of the sealing cylinder are provided with a first connecting rod, a second connecting rod and a plurality of movable rods, the top block is fixedly arranged on the first clamping plate, the first connecting rod is arranged close to the bottom of the sealing cylinder, and the second connecting rod is arranged close to the top of the sealing cylinder; the first connecting rod and the second connecting rod are movably connected through a plurality of movable rods, and the plurality of movable rods are movably connected in sequence.

[0021] The beneficial effects of the present application are as follows:

[0022] The application provides a powder cleaning device for additive printing equipment, which comprises a main shell, a sealed cylinder, a positioning mechanism and a jet mechanism. A sealed bin is arranged in the main shell, and an opening is formed in the side wall of the sealed bin. The sealed cylinder is detachably arranged in the sealed bin through the opening. An opening is formed in the bottom of the sealed bin, which is used for discharging powder. A piston is arranged in the sealed cylinder and can slide along the central axis of the sealed cylinder. The positioning mechanism comprises a clamping assembly and a vibration assembly. The clamping assembly is used for fixing the sealed cylinder, and the vibration assembly is used for vibrating the piston to loosen the caked powder on the surface of the piston. During the powder cleaning process, the clamping assembly first fixes the sealed cylinder, and the sealed cylinder is turned over to an inverted state, and the powder on the side wall of the sealed cylinder is scraped off through the sliding of the piston. The sealed cylinder is reversely turned over to a normal state, and the caked powder is loosened through the vibration of the piston by the vibration assembly. The sealed cylinder is turned over to the inverted state again, and the powder on the piston is removed by the jet mechanism. The sealed cylinder is reversely turned over to the normal state again, and the residual powder in the sealed cylinder is removed by the jet mechanism. Therefore, not only the automatic operation of powder cleaning is realized, but also the removal effect of caked powder is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0024] Figure 2 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 1 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0025] Figure 3 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 1 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0026] Figure 4 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 3 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0027] Figure 5 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 4 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0028] Figure 6 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 5 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0029] Figure 7 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 6 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0030] Figure 8 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 4 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0031] Figure 9 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 8 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure.

[0032] Figure 10 The overall structure schematic diagram of the powder cleaning device for additive printing equipment provided by an embodiment of the application is shown in the figure. Figure 9A-A sectional view;

[0033] Figure 11 A-A sectional view; Figure 9 B-B sectional view;

[0034] Figure 12 B-B sectional view; Figure 8 B-B sectional view;

[0035] Figure 13 B-B sectional view; Figure 8 B-B sectional view;

[0036] Figure 14 B-B sectional view; Figure 1 B-B sectional view.

[0037] Wherein:

[0038] 100, body frame; 101, body shell; 111, sealing chamber; 112, sealing cylinder; 113, observation window; 114, maintenance door; 115, limiting piece; 116, sealing door; 120, piston;

[0039] 200, driving mechanism; 201, displacement servo motor; 202, displacement shell; 203, single-axis displacement machine;

[0040] 300, clamping assembly; 310, clamping unit; 311, interplate; 312, limiting rod; 313, air cylinder; 314, guide rail; 315, first bracket; 316, second bracket; 321, first supporting plate; 322, second supporting plate; 331, first clamping plate; 332, second clamping plate; 341, first tension spring; 342, second tension spring; 343, top block; 351, first connecting rod; 352, second connecting rod; 353, moving rod;

[0041] 400, vibration assembly; 401, single-sided corrugated plate; 402, corrugated structure;

[0042] 501, first pneumatic spray gun; 502, second pneumatic spray gun; 503, plugboard; 504, air passage block; 505, compression spring; 506, air passage groove. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0044] The serial numbers of components in the present application, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0046] Reference will now be made to the drawings Figures 1 to 14 The powder cleaning device for additive printing equipment provided by the embodiment of the present application is described.

[0047] As Figures 1 to 2 shown, the powder cleaning device for additive printing equipment provided by the present application is particularly suitable for powder cleaning operation in the field of metal 3D printing technology, and of course it can also be used for powder cleaning treatment under other working conditions as appropriate.

[0048] Specifically, the powder cleaning device for additive printing equipment includes a main shell and a sealing cylinder 112. The main shell includes a machine shell 101 and a machine frame 100, and the machine frame 100 is fixedly connected with the machine shell 101. The machine shell 101 and the machine frame 100 serve as the mounting basis for other components, which can be directly or indirectly mounted on the machine shell 101 and the machine frame 100, and form a relatively integral whole after installation. An observation window 113 and a maintenance door 114 are arranged on the side wall of the machine shell 101, the observation window 113 is used for real-time observation of the internal condition of the machine shell 101; the maintenance door 114 is detachably connected with the machine shell 101, and serves as a window for maintenance, for replacing or maintaining the internal components.

[0049] The sealing cylinder 112 is used as a bearing cavity for the printing operation, and the printing process is completed inside the sealing cylinder 112, which can prevent powder from splashing during the printing process. The machine body shell 101 is internally provided with a sealing bin 111, the side wall of the sealing bin 111 is provided with a bin opening, the sealing cylinder 112 is detachably placed into or taken out of the inside of the sealing bin 111 through the bin opening, and the sealing cylinder 112 can be flipped around a direction perpendicular to the central axis of the sealing cylinder 112. The sealing cylinder 112 is internally provided with a piston 120, and the piston 120 can slide along the central axis direction of the sealing cylinder 112. In addition, the machine body frame 100 is further provided with a limiting piece 115 and a movable sealing door 116, the sealing door 116 is used to seal the bin opening of the sealing bin 111, and ensures the sealing performance and safety during the cleaning process of the sealing bin 111; and the limiting piece 115 is used to control the opening and closing of the sealing door 116, and prevent safety hazards caused by misoperation.

[0050] Further, the powder cleaning device for additive printing equipment further comprises a positioning mechanism and a jet mechanism. The jet mechanism is arranged inside the sealing bin 111 and is used to blow off the powder. The positioning mechanism is arranged inside the sealing bin 111, and the positioning mechanism comprises a clamping assembly 300 and a vibration assembly 400, wherein the clamping assembly 300 is used to clamp the sealing cylinder 112, and ensures the stability of the sealing cylinder 112; and the vibration assembly 400 is used to vibrate the surface of the piston 120, so as to loosen the caked powder attached to the piston 120.

[0051] Specifically, after the printing job is completed, the limiting member 115 releases the restriction on the sealing door 116, opens the sealing bin 111, places the sealing cylinder 112 containing residual powder into the sealing bin 111, and fixes the sealing cylinder 112 by the clamping assembly 300. At this time, the piston 120 stays at the bottom of the sealing cylinder 112 due to its own gravity. In addition, the bottom of the sealing bin 111 is an inwardly recessed opening, and the bottom of the machine shell 101 is provided with a powder collection box. Subsequently, the sealing cylinder 112 is flipped around the direction perpendicular to its central axis to an inverted state, so that most of the powder in the sealing cylinder 112 is naturally poured into the powder collection box at the bottom of the machine shell 101 through the opening at the bottom of the sealing bin 111. At the same time, the piston 120 slides along the inner wall of the sealing cylinder 112 towards the opening end of the sealing cylinder 112 relying on its own gravity, scrapes off the caked powder adhering to the inner wall of the sealing cylinder 112, and assists the rapid pouring of the powder, completing the preliminary cleaning of the powder. After the preliminary pouring is completed, the sealing cylinder 112 is flipped around the direction perpendicular to its central axis to a normal state in the reverse direction, and the vibration assembly 400 drives the piston 120 to vibrate, so that the caked powder adhering to the surface of the piston 120 is loosened. Then the sealing cylinder 112 is flipped around the direction perpendicular to its central axis to an inverted state again, and the air injection mechanism is started to inject air from the bottom of the sealing cylinder 112 into the interior of the sealing cylinder 112, blowing away the loosened powder and discharging it out of the sealing cylinder 112. Finally, the sealing cylinder 112 is flipped around the direction perpendicular to its central axis to a normal state in the reverse direction again, and the air injection mechanism injects air from the top of the sealing cylinder 112 into the interior of the sealing cylinder 112, to further remove the residual powder in the sealing cylinder 112.

[0052] It can be understood that the above entire process constitutes a complete powder cleaning cycle, and through repeated operation, the sealing cylinder 112 and the piston 120 can be thoroughly cleaned.

[0053] In one embodiment, the powder cleaning device for additive printing equipment further comprises a driving mechanism 200, the driving mechanism 200 comprising a power assembly and a displacement shell 202, the clamping assembly 300 and the vibration assembly 400 are arranged inside the displacement shell 202, and the sealing cylinder 112 is detachably mounted on the displacement shell 202. Further, the power assembly comprises a displacement servo motor 201 and a single-shaft displacement machine 203, wherein the single-shaft displacement machine 203 is rotationally connected with the displacement shell 202. The displacement servo motor 201 drives the displacement shell 202 and the whole displacement shell 202 inside the displacement shell 202, including the clamping assembly 300, the vibration assembly 400 and the sealing cylinder 112, to be synchronously flipped, so as to realize the coordinated linkage of the various functional components in the powder cleaning process. Therefore, not only the stability of the sealing cylinder 112 in the flipping process is ensured, but also the continuity and efficiency of the powder cleaning are improved, the orderly connection of each cleaning step is ensured, and the overall cleaning effect is effectively improved.

[0054] In one of the embodiments, the clamping assembly 300 comprises two sets of clamping units 310, which are symmetrically arranged along the central axis of the sealing cylinder 112. Each set of clamping units 310 comprises a first clamping plate 331, a second clamping plate 332, a first supporting plate 321, a second supporting plate 322, a guide rail 314, a pneumatic cylinder 313, a first bracket 315, a second bracket 316, and a driving source. The guide rail 314 is fixedly connected with the displacement housing 202, the first bracket 315 is slidingly connected with the guide rail 314, and the second bracket 316 is slidingly connected with the guide rail 314. The first clamping plate 331 is fixedly connected with the first supporting plate 321, and the first supporting plate 321 is fixedly connected with the first bracket 315. The second clamping plate 332 is fixedly connected with the second supporting plate 322, and the second supporting plate 322 is fixedly connected with the second bracket 316. The driving source is configured to drive the first supporting plate 321 and the second supporting plate 322 to slide relative to each other.

[0055] Further, the driving source comprises the pneumatic cylinder 313 and a damping unit. The pneumatic cylinder 313 is configured to drive the first supporting plate 321 and the second supporting plate 322 to move towards or away from each other along the extension direction of the guide rail 314, and the damping unit is configured to control the timing of the movement of the first supporting plate 321 and the second supporting plate 322.

[0056] In particular, the guide rail 314, the first bracket 315, and the second bracket 316 of each set of clamping units 310 are provided in two sets, so as to better control the sliding of the first clamping plate 331 and the second clamping plate 332.

[0057] In one of the embodiments, the damping unit comprises an intermediate plate 311, at least one set of first tension springs 341, and at least one set of second tension springs 342. The intermediate plate 311 is fixedly connected with the guide rail 314, one end of the first tension spring 341 is fixedly connected with the first clamping plate 331, and the other end of the first tension spring 341 is fixedly connected with the intermediate plate 311. One end of the second tension spring 342 is fixedly connected with the second clamping plate 332, and the other end of the second tension spring 342 is fixedly connected with the intermediate plate 311. The elastic force of the first tension spring 341 is greater than the elastic force of the second tension spring 342.

[0058] In one of the embodiments, the damping unit further comprises a limiting rod 312. One end of the limiting rod 312 is fixedly connected with the intermediate plate 311, and the other end of the limiting rod 312 is slidingly connected with the second clamping plate 332. The limiting rod 312 is configured to limit the stretching displacement of the second tension spring 342 along the central axis of the limiting rod 312.

[0059] Specifically, before placing the sealing cylinder 112, first start the air cylinder 313 of the two sets of clamping units 310, so that the piston rod inside the air cylinder 313 extends, and pushes the first supporting plate 321 and the second supporting plate 322 of the two sets of clamping units 310 to slide along the central axis of the limiting rod 312 to the direction away from each other. Since the elastic force of the first tension spring 341 is greater than the elastic force of the second tension spring 342, during the process of the first supporting plate 321 and the second supporting plate 322 moving away from each other, the elastic force damping of the first tension spring 341 is greater than the elastic force damping of the second tension spring 342, so that the second tension spring 342 is stretched preferentially, and then the second supporting plate 322 slides preferentially. At this time, the second supporting plate 322 drives the second clamping plate 332 to slide, and when the end of the second clamping plate 332 connected with the second tension spring 342 abuts against the end of the limiting rod 312 away from the intermediate plate 311, the second clamping plate 332 stops sliding, and at this time the second tension spring 342 no longer continues to be stretched. Subsequently, the first tension spring 341 begins to be stretched, and the first supporting plate 321 drives the first clamping plate 331 to slide, and at this time the first clamping plate 331 and the second clamping plate 332 are in an open state, reserving enough space for placing the sealing cylinder 112.

[0060] Subsequently, the sealing cylinder 112 is placed on the displacement shell 202, and then the air cylinder 313 of the two sets of clamping units 310 is started again, so that the piston rod inside the air cylinder 313 is retracted, driving the first supporting plate 321 and the second supporting plate 322 to slide reversely and reset. Since the elastic force of the first tension spring 341 is greater than the elastic force of the second tension spring 342, during the process of the first supporting plate 321 and the second supporting plate 322 reversely sliding and resetting, the elastic force of the first tension spring 341 is greater than the elastic force of the second tension spring 342, and then the first tension spring 341 is retracted first, and the first supporting plate 321 drives the first clamping plate 331 to slide reversely first, until the first clamping plate 331 abuts against the sealing cylinder 112, and the air cylinder 313 is temporarily stopped. At this time, the second clamping plate 332 of the two sets of clamping units 310 abuts against the sealing cylinder 112, thereby realizing the stable clamping and positioning of the sealing cylinder 112 on the displacement shell 202.

[0061] Further, the displacement servo motor 201 drives the displacement shell 202 to rotate through the single-axis displacement machine 203, so as to overturn the sealing cylinder 112 to an inverted state, and then the piston 120 slides downward along the inner wall of the sealing cylinder 112, i.e. the up-down direction in the figure, by relying on its own gravity, to realize the preliminary pouring of the powder. Figure 12

[0062] In one embodiment, the vibration assembly 400 includes a single-sided corrugated plate 401, which is arranged at the bottom of the piston 120, and the surface of the second clamping plate 332 is provided with a corrugated structure 402.

[0063] ​Specifically, after the initial pouring of the powder in the sealed cylinder 112 is completed, the displacement servo motor 201 drives the displacement housing 202 to rotate through the single-axis displacement machine 203, and the sealed cylinder 112 is flipped to the upright state in the reverse direction. Then the air cylinder 313 is started, and the piston rod in the air cylinder 313 is further extended. At this time, the second tension spring 342 is retracted, the second supporting plate 322 drives the second clamping plate 332 to slide in the reverse direction and reset, and then the corrugated structure 402 on the surface of the second clamping plate 332 is in sliding cooperation with the single-sided corrugated plate 401 at the bottom of the piston 120, so that the piston 120 vibrates and loosens the caked powder adhered to the surface of the piston 120.

[0064] In one of the embodiments, the clamping unit 310 further includes a top block 343, and the inner walls on both sides of the sealed cylinder 112 are respectively provided with a first connecting rod 351, a second connecting rod 352, and a plurality of movable rods 353. The top block 343 is fixedly arranged on the first clamping plate 331, and abuts against the first connecting rod 351 when the first clamping plate 331 clamps the sealed cylinder 112. The first connecting rod 351 and the second connecting rod 352 are movably connected through the plurality of movable rods 353, and the plurality of movable rods 353 are sequentially movably connected. Further, the first connecting rod 351 is arranged close to the bottom of the sealed cylinder 112, and the second connecting rod 352 is arranged close to the top of the sealed cylinder 112.

[0065] Specifically, when the first clamping plate 331 moves along the central axis of the limiting rod 312 towards the second clamping plate 332 during the clamping process, the top block 343 pushes one end of the first connecting rod 351 to move towards the inside of the sealed cylinder 112, and the other end of the first connecting rod 351 moves in the opposite direction, and then the plurality of movable rods 353 between the first connecting rod 351 and the second connecting rod 352 are sequentially linked, and then the power is transmitted to the second connecting rod 352. At this time, the end of the second connecting rod 352 away from the piston 120 moves towards the inside of the sealed cylinder 112 and forms a limiting structure. When the sealed cylinder 112 is inverted, and the piston 120 moves downward along the central axis of the sealed cylinder 112 towards the opening end of the sealed cylinder 112 under the action of gravity, the second connecting rod 352 on both sides of the sealed cylinder 112 can effectively limit the movement range of the piston 120, preventing it from being separated from the sealed cylinder 112, thereby ensuring the stability and safety of the entire cleaning process.

[0066] In one of the embodiments, the positioning mechanism further includes a linkage unit. Specifically, the linkage unit is used to control the air injection mechanism to inject air flow into the sealed cylinder 112 when the second clamping plate 332 slides along the central axis of the limiting rod 312.

[0067] In one of the embodiments, the linkage unit comprises an insertion plate 503 and a ventilation block 504. The insertion plate 503 and the ventilation block 504 are in sliding fit, and the insertion plate 503 is fixedly connected with the second clamping plate 332. The ventilation block 504 is in sliding fit with the piston 120, and a ventilation groove 506 is formed between the ventilation block 504 and the bottom end of the piston 120, and the ventilation groove 506 is in communication with the inside and outside of the sealed cylinder 112. When the insertion plate 503 slides towards or away from the ventilation block 504, the ventilation block 504 slides along the central axis of the sealed cylinder 112 to open or close the ventilation groove 506.

[0068] Further, the linkage unit further comprises a compression spring 505. One end of the compression spring 505 is fixedly connected with the ventilation block 504, and the other end of the compression spring 505 is fixedly connected with the piston 120, and the elastic force of the compression spring 505 always makes the ventilation block 504 have a sliding tendency towards the inside of the sealed cylinder 112.

[0069] Further, the air injection mechanism comprises a plurality of first pneumatic spray guns 501 and a plurality of second pneumatic spray guns 502. The plurality of first pneumatic spray guns 501 are symmetrically fixedly arranged on the inner side wall of the left and right ends of the displacement shell 202, and are parallel to the bottom end of the piston 120, that is, the left and right directions in Figure 2 , and the nozzle of the first pneumatic spray gun 501 is directed towards the bottom end of the piston 120; the second pneumatic spray gun 502 is arranged on the inner wall of the upper end of the machine shell 101, that is, the up and down directions in Figure 13 , and the nozzle of the second pneumatic spray gun 502 is directed towards the inside of the sealed cylinder 112.

[0070] Specifically, during the sliding fit between the corrugated structure 402 on the surface of the second clamping plate 332 and the single-sided corrugated plate 401 at the bottom of the piston 120, the insertion plate 503 slides synchronously with the second clamping plate 332. Because the sliding contact surface between the ventilation block 504 and the insertion plate 503 is an inclined surface, when the insertion plate 503 slides towards the ventilation block 504, the sliding fit between the insertion plate 503 and the ventilation block 504 makes the ventilation block 504 slide downwards, that is, Figure 11The piston 120 is in the state of being stuck to the sealing cylinder 112. The first pneumatic spray gun 501 is started to spray gas into the sealing cylinder 112 through the air vent groove 506. Since the sliding of the piston 120 is limited by the cooperation of the plug 503 and the air vent block 504, the sprayed gas can effectively blow away the loose powder on the surface of the piston 120 and discharge the powder out of the sealing cylinder 112. Then, the position servo motor 201 drives the position housing 202 to rotate again through the single-axis positioner 203, and the sealing cylinder 112 is flipped to the normal state. The gas cylinder 313 is started to make the piston rod in the gas cylinder 313 extend, and the second tension spring 342 is stretched first. The second clamp plate 332 is driven by the second supporting plate 322 to slide along the central axis of the limiting rod 312 away from the air vent block 504, so that the plug 503 is separated from the air vent block 504, and the air vent groove 506 is closed. At this time, the second pneumatic spray gun 502 is started to spray gas into the sealing cylinder 112, and the powder remaining in the sealing cylinder 112 is further cleaned.

[0071] Any combination of the technical features in the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present disclosure.

[0072] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A powder cleaning device for additive printing equipment, characterized in that: include: A main housing, wherein a sealed chamber is provided inside the main housing, a chamber opening is provided on a side wall of the sealed chamber, and an opening is provided at the bottom of the sealed chamber for discharging powder; a sealing cylinder, the sealing cylinder being detachably placed in the sealing chamber through the chamber opening, the sealing cylinder being capable of turning around a direction perpendicular to its own central axis; a piston being provided in the sealing cylinder, the piston being capable of sliding along the central axis of the sealing cylinder; A positioning mechanism, comprising a clamping assembly and a vibration assembly, wherein the clamping assembly is used to clamp and fix the sealing cylinder, and the vibration assembly is used to loosen agglomerated powder on the surface of the piston; An air jet mechanism is arranged in the sealed chamber and is used to blow away powder; in the powder cleaning stage, the sealed cylinder is flipped to an inverted state, and the piston slides along the central axis of the sealed cylinder to scrape off the powder on the side wall of the sealed cylinder; the sealed cylinder is flipped back to an upright state, and the piston loosens the agglomerated powder under the action of the vibration component; the sealed cylinder is flipped back to an inverted state again, and the air jet mechanism clears the powder on the piston; the sealed cylinder is flipped back to an upright state again, and the air jet mechanism clears the residual powder in the sealed cylinder.

2. The powder cleaning device for additive printing equipment according to claim 1, characterized in that: It also includes a driving mechanism, which includes a power component and a displacement shell. The clamping component and the vibration component are both arranged inside the displacement shell, and the sealing cylinder is detachably connected to the displacement shell; the power component is used to drive the displacement shell, the clamping component, the vibration component and the sealing cylinder to flip synchronously.

3. The powder cleaning device for additive printing equipment according to claim 2, characterized in that: The clamping assembly includes two groups of clamping units, and the two groups of clamping units are symmetrically arranged in the direction of the central axis of the sealing cylinder; each group of the clamping units includes a first clamping plate, a second clamping plate, a first support plate, a second support plate, a cylinder, a guide rail, a first bracket and a second bracket; the guide rail is fixedly connected to the displacement shell, the first bracket is slidably connected to the guide rail, and the second bracket is slidably connected to the guide rail; the first clamping plate is fixedly connected to the first support plate, and the first support plate is fixedly connected to the first bracket; the second clamping plate is fixedly connected to the second support plate, and the second support plate is fixedly connected to the second bracket; each group of the clamping units also includes a driving source, and the driving source is used to drive the first support plate and the second support plate to slide relative to each other.

4. The powder cleaning device for additive printing equipment according to claim 3, characterized in that: The driving source includes a cylinder and a damping unit. The cylinder is used to make the first and second pallets approach or move away from each other in the extension direction of the guide rail. The damping unit is used to control the movement timing of the first and second pallets.

5. The powder cleaning device for additive printing equipment according to claim 4, characterized in that: The damping unit includes an intermediate plate, at least one group of first tension springs and at least one group of second tension springs; the intermediate plate is fixedly connected to the guide rail, one end of the first tension spring is fixedly connected to the first clamping plate, and the other end of the first tension spring is fixedly connected to the intermediate plate; one end of the second tension spring is fixedly connected to the second clamping plate, and the other end of the second tension spring is fixedly connected to the intermediate plate; the elastic force of the first tension spring is greater than the elastic force of the second tension spring.

6. The powder cleaning device for additive printing equipment according to claim 5, characterized in that: The damping unit also includes a limiting rod, one end of which is fixedly connected to the intermediate plate, and the other end of which is slidably connected to the second clamping plate. The limiting rod is used to limit the tensile displacement of the second tension spring in the direction of the central axis of the limiting rod.

7. The powder cleaning device for additive printing equipment according to claim 3, characterized in that: The vibration component includes a single-sided corrugated plate, which is arranged at the bottom of the piston; the surface of the second clamping plate is provided with a corrugated structure; when the second clamping plate slides in the extension direction of the guide rail, the corrugated structure slides with the single-sided corrugated plate to cause the piston to vibrate.

8. The powder cleaning device for additive printing equipment according to claim 7, characterized in that: The positioning mechanism further includes a linkage unit, which is used to control the jet mechanism to spray air into the interior of the sealing cylinder when the second clamping plate slides in the extending direction of the guide rail.

9. The powder cleaning device for additive printing equipment according to claim 8, characterized in that: The linkage unit includes an insert plate and a ventilation block, the insert plate and the ventilation block are slidably matched, and the insert plate is fixedly connected to the second clamping plate; the ventilation block is slidably connected to the piston, and a ventilation groove is formed between the ventilation block and the bottom end of the piston, and the ventilation groove connects the internal and external environments of the sealing cylinder; when the insert plate slides toward or away from the ventilation block, the ventilation block can slide along the central axis direction of the sealing cylinder to open or close the ventilation groove.

10. The powder cleaning device for additive printing equipment according to claim 3, characterized in that: Each group of the clamping units also includes a top block, and a first connecting rod, a second connecting rod and a plurality of movable rods are provided on the inner walls on both sides of the sealing cylinder; the top block is fixedly set on the first clamping plate, the first connecting rod is set near the bottom of the sealing cylinder, and the second connecting rod is set near the top of the sealing cylinder; the first connecting rod and the second connecting rod are movably connected by a plurality of movable rods, and the plurality of movable rods are movably connected in sequence.

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