A self-cleaning 3D printing device

Abstract

The present invention discloses a self-cleaning 3D printing device, including a printer cabin and a molding cylinder and a powder cylinder arranged inside the printer cabin, a print head is installed on the top of the printer cabin just above the molding cylinder, electric tracks are provided on the upper ends of the two side walls inside the printer cabin, and a track slide is installed on each of the electric tracks, a powder suction box is connected between the two track slides, and the ends of the two track slides are installed with a lifting cylinder for driving the powder suction box cover above the molding cylinder, a pad and a lifting mechanism for lifting the pad are installed in the molding cylinder and the powder cylinder, wherein a first push rod is embedded in the top surface of the pad located in the molding cylinder, a substrate is placed on the pad, and the bottom surface of the substrate is clamped with the top end of the first push rod. The present invention not only realizes the close-range powder suction processing between the powder suction cover and the substrate, but also can accelerate the removal of powder on the substrate and the parts during the rotation of the substrate and the parts.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing equipment, and in particular to a self-cleaning 3D printing equipment. Background Art

[0002] A 3D printer is an advanced manufacturing device that can transform digital models into physical objects, and build three-dimensional objects by adding materials layer by layer. When using a metal 3D printer to print parts, you need to first lay metal powder on the printing substrate, and then print the finished product layer by layer, and after each layer is printed, you need to lay the powder on the substrate again. With this printing method, after printing, the substrate and the forming cylinder are covered with layers of metal powder. Therefore, when taking out the parts, you need to clean the powder first and then take out the parts.

[0003] The current printing equipment generally cleans metal powders manually. Workers first make preparations for cleaning the powder, then open the printer's door, and then use a vacuum cleaner or special powder suction equipment to remove the powder on the substrate one by one. This processing method is not efficient at first, and during the processing, separate powder processing equipment is required, which leads to poor continuity of work, thus affecting the continuous processing efficiency of the product. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low processing efficiency in the prior art, the need for separate powder processing equipment during the processing, and poor working continuity, and to propose a self-cleaning 3D printing device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A self-cleaning 3D printing device, comprising a printer cabin and a molding cylinder and a powder cylinder arranged inside the printer cabin, wherein a print head is installed at the top of the interior of the printer cabin just above the molding cylinder, electric tracks are arranged at the upper ends of the two side walls inside the printer cabin, and a track slide is installed on each of the electric tracks, a powder suction box is connected between the two track slides, and a lifting cylinder for driving the powder suction box to cover above the molding cylinder is installed at the ends of the two track slides, a pad and a lifting mechanism for lifting the pad are installed in the molding cylinder and the powder cylinder, wherein a first push rod is embedded in the top surface of the pad located in the molding cylinder, a substrate is placed on the pad, and the bottom surface of the substrate is clamped with the top end of the first push rod;

[0007] The bottom surface of the powder suction outer box is open, and the ends of the two side walls of the inner side of the powder suction outer box are installed with screw lifting assemblies, and the two screw lifting assemblies on the same side are connected with lifting mounting seats, and the side surfaces facing the two lifting mounting seats are rotatably connected with rotating side support plates, and a rotating motor that drives the rotating side support plates to rotate is installed on one of the lifting mounting seats, and a powder suction cover covering the top of the base plate is fixedly connected between the upper ends of the two rotating side support plates, and the upper and lower ends of each rotating side support plate are symmetrically connected with sliding clamps, and a regulating sliding device is installed inside each rotating side support plate. A reciprocating lifting assembly for moving the clamping parts up and down, a second push rod for driving the corresponding sliding clamping parts to slide left and right is installed inside each rotating side support plate, a powder blowing assembly for blowing air into the gap between the base plate and the forming cylinder is connected between the multiple sliding clamping parts at the lower ends of the two rotating side support plates, a hollow rotating shaft is fixedly installed in the middle part of each rotating side support plate, and a ventilation connecting piece is connected between the two sliding clamping parts at the upper end of each rotating side support plate and between the two sliding clamping parts at the lower end, a three-way valve is installed on the rotating shaft, and the ends of the two ventilation connecting pieces are respectively connected to the three-way valve.

[0008] Preferably, a negative pressure powder suction pipe is connected to the top of the powder suction hood, a rotating plate is rotatably installed on one side wall of the powder suction outer box, the end of the negative pressure powder suction pipe passes through the rotating plate and is connected to a negative pressure vacuum pump, the end of the rotating shaft is connected to an air blowing inlet pipe, and is connected to an inert gas blowing fan through the air blowing inlet pipe, and the air blowing inlet pipe and the negative pressure powder suction pipe are both telescopic tubes.

[0009] Preferably, a powder outlet is installed at the top of the powder suction outer box, and air inlets are provided at the bottom ends of both sides of the powder suction outer box. Several air inlets are connected to the inert gas storage tank through pipelines, and the powder outlet is connected to the powder cylinder through a pipeline.

[0010] Preferably, a driven wheel is fixedly mounted on the outer side of one of the rotating shafts, a driving wheel meshing with the driven wheel is mounted on the output shaft of the rotating motor, and the driven wheel is located between the three-way valve and the rotating side support plate.

[0011] Preferably, both ends of the rotating side support plate are provided with recesses on the upper and lower sides for the sliding clamping piece to slide left and right, and the reciprocating lifting assembly includes a double-headed rotating rod rotatably installed between the upper and lower recesses, a worm motor installed on the inner wall of one side of the rotating side support plate, a worm connected to the worm motor, and an outer sleeve threadedly inserted into the two ends of the double-headed rotating rod, and a worm wheel matching the worm is installed in the middle of each of the double-headed rotating rods, and the top end of the outer sleeve is fixedly connected to a limiting cross plate inserted into the sliding clamping piece.

[0012] Preferably, the sliding clamping member includes a tightening upper rod and a tightening lower rod which fit in the recess, the same end of the tightening upper rod and the tightening lower rod are equipped with an elastic plug joint facing the recessed hole on the base plate, the other end of the tightening upper rod and the tightening lower rod are equipped with a telescopic rod, and a connecting ring is fixedly connected between the two telescopic rods, the end of the second push rod is fixed to the connecting ring, and the tightening upper rod and the tightening lower rod are provided with a T-shaped groove on the opposite side for the sliding of the limiting cross plate.

[0013] Preferably, both ends of the two side walls to which the powder suction cover is fixed to the rotating side support plate are provided with through grooves for the tightening upper rod to slide up and down and left and right.

[0014] Preferably, ventilation grooves are provided inside the tightening upper rod and the tightening lower rod, wherein an air inflation port connected to the ventilation groove is provided on the elastic plug joint at the end of the tightening upper rod, and a connecting incision connected to the ventilation groove is opened in the middle of the bottom surface of the tightening lower rod, the connecting incision is connected to the powder blowing assembly, and the end of the ventilation connector is fitted and inserted in the ventilation groove.

[0015] Preferably, the powder blowing assembly includes an outer ventilation tube fixed at the connecting incision, an inner ventilation tube connected between the two outer ventilation tubes, and a blowing pipe installed at the bottom of the outer ventilation tube and the inner ventilation tube, the top of the outer ventilation tube is provided with a through hole at the connecting incision, and the bottom end of the blowing pipe is inclined toward the gap between the base plate and the forming cylinder.

[0016] Preferably, the ventilation connector includes a T-tube and square connecting tubes installed at both ends of the top of the T-tube, the square connecting tubes are slidably inserted in the ventilation groove, and the bottom end of the T-tube is installed on the valve port of the three-way valve.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The present invention installs a powder suction box in the cabin of the printer, and the powder suction box can seal the forming cylinder by lifting and moving left and right, and then the powder blowing component in the powder suction box blows away the powder in the gap between the substrate and the forming cylinder, and then cooperates with the first push rod, the rotating side support plate, the sliding clamping member, the lifting mounting seat, the rotating motor and the powder suction cover, and then the substrate is lifted up and clamped to rotate with the powder suction cover, so that the powder suction treatment between the powder suction cover and the substrate is realized in a close distance, and at the same time, the powder on the substrate and the parts can be removed quickly during the rotation of the substrate and the parts, the removal efficiency is improved, and the removal is ensured to be thorough, so as to improve the processing efficiency of the parts when they are working continuously, and reduce manual operation as much as possible;

[0019] In addition, by filling the powder suction hood with inert gas, and the powder suction hood and the substrate rotate together in the powder suction outer box following the rotating side support plate, the powder on the substrate is removed in an inert gas protection environment, and multiple washing and ventilation are unnecessary;

[0020] In addition, the ventilation connector is connected to the sliding clamp and the powder blowing assembly. When the sliding clamp moves, it can drive part of the powder blowing assembly to move, so that the powder between the substrate and the forming cylinder is completely blown out. After that, the sliding clamp blows out the powder in the holes on the substrate and then clamps it, avoiding the problem of powder residue caused by the clamping process of the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of a self-cleaning 3D printing device proposed by the present invention Figure 1 ;

[0022] Figure 2 A schematic diagram of the structure of a self-cleaning 3D printing device proposed by the present invention;

[0023] Figure 3 A cross-sectional view of a self-cleaning 3D printing device proposed by the present invention Figure 2 ;

[0024] Figure 4 A schematic diagram of the structure of a rotating side support plate of a self-cleaning 3D printing device proposed by the present invention;

[0025] Figure 5 A cross-sectional view of a powder suction box of a self-cleaning 3D printing device proposed by the present invention Figure 1 ;

[0026] Figure 6 A cross-sectional view of a powder suction box of a self-cleaning 3D printing device proposed by the present invention Figure 2 ;

[0027] Figure 7 This is a schematic diagram of the powder suction box structure of a self-cleaning 3D printing device proposed by the present invention;

[0028] Figure 8 A cross-sectional view of a rotating side support plate of a self-cleaning 3D printing device proposed by the present invention;

[0029] Fig. 9 A schematic diagram of a contraction structure of a sliding clamping member of a self-cleaning 3D printing device proposed by the present invention;

[0030] Fig.10 This is a schematic diagram of the expanded structure of a sliding clamping member of a self-cleaning 3D printing device proposed by the present invention;

[0031] Fig.11 A cross-sectional view of a powder suction cover of a self-cleaning 3D printing device proposed by the present invention;

[0032] Fig.12 A self-cleaning 3D printing device proposed by the present invention Fig.11 Enlarged view of point A in the middle;

[0033] Fig.13 A schematic diagram of the structure of a powder blowing component of a self-cleaning 3D printing device proposed by the present invention;

[0034] Fig.14 A schematic diagram of the structure of a ventilation connector for a self-cleaning 3D printing device proposed by the present invention;

[0035] Fig.15 A cross-sectional view of a powder suction box of a self-cleaning 3D printing device proposed by the present invention Figure 3 ;

[0036] Fig.16 A cross-sectional view of a substrate flipping state of a self-cleaning 3D printing device proposed by the present invention;

[0037] Fig.17 This is a schematic structural diagram of a self-cleaning 3D printing device proposed by the present invention when the substrate is not clamped;

[0038] Fig.18 A schematic diagram of the structure of a self-cleaning 3D printing device proposed by the present invention when the substrate is clamped Figure 1 ;

[0039] Fig.19 A schematic diagram of the structure of a self-cleaning 3D printing device proposed by the present invention when the substrate is clamped Figure 2 .

[0040] In the figure: 1. Printer cabin; 101. Cabin door; 102. Forming cylinder; 103. Powder cylinder; 104. Lifting mechanism; 105. Pad; 2. Powder suction box; 201. Air inlet; 202. Powder outlet; 3. Base plate; 4. Print head; 5. Electric track; 6. Track slide; 7. Lifting cylinder; 8. First push rod; 9. Screw lifting assembly; 10. Lifting mounting seat; 11. Rotating side support plate; 12. Sliding clamp; 13. Powder suction cover; 14. Negative pressure powder suction pipe; 15. Powder blowing assembly; 16. Ventilation connector; 17. Reciprocating lifting assembly; 18. Rotating motor; 19. Turn plate; 20. Rotating shaft; 21. Second push rod; 22. Three-way valve; 151. Ventilation outer tube; 152. Ventilation inner tube; 153. Blowing tube; 1101. Driven wheel; 1102. Notch; 161. T-tube; 162. Square connecting tube; 171. Worm motor; 172. Worm; 173. Double-headed rotating rod; 174. Outer sleeve; 121. Tightening upper rod; 122. Tightening lower rod; 123. Elastic plug joint; 124. Connecting ring; 125. T-slot; 126. Ventilation slot; 127. Connecting incision; 128. Telescopic rod; 1301. Through slot. DETAILED DESCRIPTION

[0041] 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 only part of the embodiments of the present invention, rather than all the embodiments.

[0042] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention.

[0043] Reference Figure 1-Figure 3 A self-cleaning 3D printing device comprises a printer cabin 1 and a forming cylinder 102 and a powder cylinder 103 arranged inside the printer cabin 1. A print head 4 is installed on the top of the printer cabin 1, which is located directly above the forming cylinder 102. Electric rails 5 are provided at the upper ends of the two side walls inside the printer cabin 1. A hatch 101 corresponding to the forming cylinder 102 is provided on the surface of the printer cabin 1. A rail slide 6 is installed on each electric rail 5. The electric rail 5 has a built-in driving source, which can make the rail slide 6 slide along the electric rail 5. A powder suction box 2 is connected between the two rail slides 6, and a lifting cylinder 7 for driving the powder suction box 2 to cover the top of the forming cylinder 102 is installed at the ends of the two rail slides 6. Specifically, the bottom of the lifting cylinder 7 The ends are fixed with the two end protrusions of the powder suction outer box 2. With the cooperation of the electric track 5 and the lifting cylinder 7, the powder suction outer box 2 can move horizontally or vertically in the printer cabin 1, so that the powder suction outer box 2 is moved above the powder cylinder 103 before printing, and when cleaning the powder, it is moved above the forming cylinder 102. The forming cylinder 102 and the powder cylinder 103 are both equipped with a pad 105 and a lifting mechanism 104 for lifting the pad 105, wherein the top surface of the pad 105 located in the forming cylinder 102 is embedded with a first push rod 8, and a substrate 3 is placed on the pad 105, and the bottom surface of the substrate 3 is clamped with the top end of the first push rod 8, and the clamping adaptation is to better enable the first push rod 8 to drive the substrate 3 to move upward, thereby ensuring the stability of the substrate 3 during movement.

[0044] Reference Figure 3-Figure 6The bottom surface of the powder suction box 2 is open, and is used to fit with the inner bottom wall of the printer cabin 1, so as to form a sealed space above the forming cylinder 102 for subsequent cleaning of the powder. The ends of the inner side walls of the powder suction box 2 are installed with screw lifting assemblies 9, and the screw lifting assemblies 9 are composed of a screw and a servo motor installed on the top of the powder suction box 2, and there are four screws in total. The two screw lifting assemblies 9 on the same side are connected with a lifting mounting seat 10, and the side surfaces facing each other of the two lifting mounting seats 10 are rotatably connected with a rotating side support plate 11, and a rotating motor 18 for driving the rotating side support plate 11 to rotate is installed on one of the lifting mounting seats 10, and the distance between the two rotating side support plates 11 is greater than the horizontal length of the substrate 3, which can ensure that the rotating side support plates 11 can be located on both sides of the substrate 3 when moving downward with the lifting mounting seat 10.

[0045] The two rotating side branches 11 are fixedly connected with a powder suction cover 13 covering the top of the substrate 3. When the two rotating side branches 11 are located at both sides of the substrate 3, the powder suction cover 13 and the sides fixed to the rotating side branches 11 are also located at both sides of the substrate 3. The other two sides slide and fit with the outer sides of the substrate 3. When the substrate 3 rotates with the powder suction cover 13, the surface powder will not fall from the gap between the substrate 3 and the powder suction cover 13 after falling off. The upper and lower ends of each rotating side branch plate 11 are symmetrically connected with sliding clamps 12. A reciprocating lifting assembly 17 for regulating the up and down movement of the sliding clamps 12 is installed inside each rotating side branch plate 11. A second push rod 21 for driving the corresponding sliding clamps 12 to slide left and right is also installed inside each rotating side branch plate 11. The sliding clamps 12 first slide left and right to reach the upper and lower positions of the substrate 3, and then move up and down to clamp the substrate 3, so that the rotating side branch plates 11 drive the substrate 3 to rotate through the sliding clamps 12.

[0046] After the substrate 3 is rotated, the powder in the gap between the substrate 3 and the forming cylinder 102 is cleaned as follows: a powder blowing assembly 15 for blowing air into the gap between the substrate 3 and the forming cylinder 102 is connected between the multiple sliding clamps 12 at the lower ends of the two rotating side support plates 11. When the powder blowing assembly 15 follows the lifting mounting seat 10 to move to the lowermost end of the powder suction outer box 2, it is aligned with the gap between the substrate 3 and the forming cylinder 102.

[0047] A hollow rotating shaft 20 is fixedly installed in the middle of each rotating side support plate 11, and the rotating shaft 20 slides through the lifting mounting seat 10, so that the lifting mounting seat 10 can support the rotating side support plate 11 through the rotating shaft 20. A ventilation connector 16 is connected between the two sliding clamping members 12 at the upper end of each rotating side support plate 11 and between the two sliding clamping members 12 at the lower end. A three-way valve 22 is installed on the rotating shaft 20, and the ends of the two ventilation connectors 16 are respectively connected to the three-way valve 22. The three-way valve 22 can control the opening and closing of the ventilation connector 16, thereby achieving ventilation between the hollow rotating shaft 20 and the sliding clamping member 12.

[0048] In order to better cooperate with the rotating motor 18 to drive the rotating shaft 20 to rotate, a driven wheel 1101 is fixedly installed on the outer side of one of the rotating shafts 20, and a driving wheel meshing with the driven wheel 1101 is installed on the output shaft of the rotating motor 18. The driven wheel 1101 is located between the three-way valve 22 and the rotating side support plate 11.

[0049] Reference Figure 3-Figure 7 The top of the powder suction cover 13 is connected with a negative pressure powder suction pipe 14, and a rotating plate 19 is rotatably installed on one side wall of the powder suction outer box 2. The end of the negative pressure powder suction pipe 14 passes through the rotating plate 19 and is connected to the negative pressure vacuum pump. The negative pressure vacuum pump can absorb the powder in the powder suction cover 13 through the negative pressure powder suction pipe 14. The end of the rotating shaft 20 is connected with an air intake pipe, and the inert gas blower is connected to the air intake pipe. The inert gas can be transported to the sliding clamp 12 through the rotating shaft 20, the air intake pipe, and the ventilation connector 16, and reaches the powder blowing assembly 1 through the sliding clamp 12. 5, used for powder blowing treatment, at the same time, the powder suction cover 13 and the rotating shaft 20 can move up and down in the powder suction outer box 2, therefore, the air intake pipe and the negative pressure powder suction pipe 14 are telescopic pipes to cooperate with the movement, at the same time, the powder suction cover 13 will also rotate with the two rotating side support plates 11, so the negative pressure powder suction pipe 14 will also rotate with it, so the rotating plate 19 is set to rotate, and the rotating plate 19 is set to rotate coaxially with the rotating shaft 20 at the same speed to ensure the stability of the state of the negative pressure powder suction pipe 14, the rotating plate 19 can be rotated by adding a driving motor to the outer wall of the powder suction outer box 2, such as Figure 7 As shown, the driving motor is located at the corner, and the shaft of the driving motor and the outer side of the rotating plate 19 are provided with gears meshing with each other, so as to realize the rotation of the rotating plate 19.

[0050] Reference Figure 7 A powder outlet 202 is installed at the top of the powder suction outer box 2, and air inlets 201 are provided at the bottom of both sides of the powder suction outer box 2. Several air inlets 201 are connected with the inert gas storage tank through pipelines, and inert gas such as argon can be filled into the powder suction outer box 2 through the air inlet 201. The powder outlet 202 is connected with the powder cylinder 103 through a pipeline, and another vacuum pump is installed on the pipeline, which can absorb and filter the powder diffused into the entire powder suction outer box 2 and discharge the powder into the powder cylinder 103.

[0051] Reference Figure 4 and Figure 8In order to achieve the stability of the up and down movement of the sliding clamping member 12, specifically, both ends of the rotating side support plate 11 are provided with notches 1102 for the sliding clamping member 12 to slide left and right. The setting of the notches 1102 can ensure the stability of the up and down and left and right sliding of the sliding clamping member 12. The reciprocating lifting assembly 17 includes a double-headed rotating rod 173 rotatably installed between the upper and lower notches 1102, a worm motor 171 installed on the inner wall of one side of the rotating side support plate 11, a worm 172 connected to the worm motor 171, and a threaded plug-in on the double-headed rotating rod 17 The outer sleeves 174 at both ends of the double-headed rotating rod 173 are provided with a worm wheel matched with the worm 172 in the middle part, and both ends of the double-headed rotating rod 173 are threaded rods. When the worm motor 171 rotates, the worm 172 and the worm wheel drive the two double-headed rotating rods 173 to rotate together, thereby driving the four outer sleeves 174 to move simultaneously. The top of the outer sleeve 174 is fixedly connected with a limit horizontal plate inserted into the sliding clamp 12, which can not only ensure the stability of the outer sleeve 174 moving up and down, but also drive the sliding clamp 12 to move up and down.

[0052] Reference Figure 8-Figure 12 The sliding clamping member 12 includes a top tightening rod 121 and a top tightening rod 122 which fit into the notch 1102. The top tightening rod 121 and the top tightening rod 122 have the same structural dimensions. The same end of the top tightening rod 121 and the top tightening rod 122 is equipped with an elastic plug connector 123 facing the concave hole on the base plate 3. Fig.11 As shown, since the substrate 3 is heavy, in order to facilitate the removal and installation of the substrate 3 from the printer, a through recessed hole is generally opened at the four corners of the substrate 3, and a hanging ear can be screwed into each recessed hole, so that the substrate 3 can be easily taken out by hanging the earphone. Therefore, the elastic plug connector 123 is adapted to the recessed hole of the substrate 3, and the substrate 3 can be clamped. The other ends of the tightening upper rod 121 and the tightening lower rod 122 are both installed with a telescopic rod 128, and a connecting ring 124 is fixedly connected between the two telescopic rods 128, and the end of the second push rod 21 is fixed to the connecting ring 124. After the connecting ring 124 is fixed, when the tightening upper rod 121 and the tightening lower rod 122 move at the same time, the telescopic rod 128 is in a telescopic state to ensure the normal operation of the tightening upper rod 121 and the tightening lower rod 122. The tightening upper rod 121 and the tightening lower rod 122 are both opened on the opposite sides with a T-shaped slide groove 125 for the sliding of the limiting horizontal plate.

[0053] Both the upper tightening rod 121 and the lower tightening rod 122 are provided with ventilation grooves 126, wherein the elastic plug joint 123 at the end of the upper tightening rod 121 is provided with an air blowing port connected to the ventilation groove 126. When the upper tightening rod 121 moves to the concave hole of the substrate 3, the concave hole has been filled with powder, so the powder needs to be blown out first and then pushed into the concave hole by the elastic plug joint 123. A connecting incision 127 connected to the ventilation groove 126 is opened in the middle of the bottom surface of the lower tightening rod 122, and the connecting incision 127 is connected to the powder blowing assembly 15 to ventilate the powder blowing assembly 15. The end of the ventilation connector 16 is fitted and plugged in the ventilation groove 126. When the upper tightening rod 121 and the lower tightening rod 122 slide left and right, the stability of the ventilation connector 16 can be guaranteed.

[0054] Reference Fig.12 Both ends of the two side walls where the powder suction cover 13 and the rotating side support plate 11 are fixed are provided with through grooves 1301 for the upper rod 121 to slide up and down and left and right, so as to facilitate the movement of the upper rod 121.

[0055] Reference Fig.10 and Fig.13 In order to ensure the stable operation of the powder blowing assembly 15, specifically, the powder blowing assembly 15 includes an outer ventilation tube 151 that is fitted and fixed at the connecting incision 127, an inner ventilation tube 152 that is connected between the two outer ventilation tubes 151, and an air blowing tube 153 that is installed at the bottom of the outer ventilation tube 151 and the inner ventilation tube 152. The top of the outer ventilation tube 151 is provided with a through hole at the connecting incision 127, so that the two outer ventilation tubes 151 are respectively connected to the tightening lower rods 122 on both sides of the substrate 3, and the bottom end of the air blowing tube 153 is inclined. Towards the gap between the substrate 3 and the forming cylinder 102, and because the tightening lower rod 122 will move left and right when clamping the substrate 3, the tightening lower rod 122 will drive the ventilation outer tube 151 to move. Therefore, at this time, when the two ventilation outer tubes 151 move, the ventilation inner tube 152 can slide in the ventilation outer tube 151, and the distance between the blowing pipe 153 at both ends of the bottom of the ventilation inner tube 152 and the end of the ventilation outer tube 151 is greater than the distance that the ventilation outer tube 151 follows the movement to avoid interference caused by the blowing pipe 153.

[0056] Reference Figure 4 , Figure 6 and Figure 10-Figure 14, since the ventilation connector 16 needs to ensure that it rotates with the rotating shaft 20, and at the same time needs to ventilate the upper tightening rod 121 and the lower tightening rod 122, specifically, the ventilation connector 16 includes a T-tube 161 and a square connecting tube 162 installed at both ends of the top of the T-tube 161, the square connecting tube 162 is slidably inserted in the ventilation groove 126, and the bottom end of the T-tube 161 is installed on the valve port of the three-way valve 22. Therefore, each three-way valve 22 is installed with two ventilation connectors 16, one group connecting the two upper tightening rods 121, and the other group connecting the two lower tightening rods 122. When the powder blowing assembly 15 needs to work, the three-way valve 22 opens the ventilation connector 16 connected to the lower tightening rod 122, and when the elastic plug joint 123 needs to be inflated, the three-way valve 22 opens the ventilation connector 16 connected to the upper tightening rod 121.

[0057] Working principle: Refer to Figure 1-Figure 19 During the printing process, the substrate 3 is first placed on the pad 105 of the forming cylinder 102, and then the lifting mechanism 104 adjusts the height of the substrate 3 so that the powder in the powder cylinder 103 can be laid on the substrate 3. During the printing process of the print head 4, each time a layer is printed, the lifting mechanism 104 adjusts the substrate 3 to descend, the powder in the powder cylinder 103 rises, and a new layer of powder is laid until the part printing is completed, and the powder in the forming cylinder 102 is cleaned.

[0058] First, the powder suction outer box 2 is moved to the top of the forming cylinder 102 by the electric track 5. Figure 1 The position shown in the figure, then the lifting cylinder 7 extends, driving the powder suction outer box 2 to move downward, until the bottom of the powder suction outer box 2 fits with the bottom wall inside the printer cabin 1, and the upper end of the forming cylinder 102 is sealed. After the sealing is completed, argon gas is added into the powder suction outer box 2 from the air inlet 201, until the gas environment inside the powder suction outer box 2 meets the powder suction cleaning requirement, and then the screw lifting assembly 9 is controlled to work, the lifting mounting seat 10 moves downward, and drives the rotating side support plate 11, the sliding clamping member 12, the powder blowing assembly 15 and the powder suction cover 13 to move downward, until they move to the bottom, as shown in the figure. Fig.15 As shown, the three-way valve 22 then regulates the ventilation connector 16 connected to the tightening lower rod 122 to be unobstructed, and the ventilation connector 16 transmits argon gas from the tightening lower rod 122 to the ventilation outer tube 151 of the powder blowing assembly 15, and the gas is finally blown out from the ventilation outer tube 151 and the blowing tube 153 at the lower end of the ventilation inner tube 152, blowing out the powder in the gap between the substrate 3 and the forming cylinder 102. During the blowing process, the powder suction hood 13 adsorbs and processes the blown powder.

[0059] After that, the first push rod 8 extends, driving the substrate 3 to start upward, until the substrate 3 rises to between the tightening upper rod 121 and the tightening lower rod 122, the second push rod 21 is started to contract, and the contraction of the second push rod 21 drives the tightening upper rod 121 and the tightening lower rod 122 to move toward the substrate 3 along the recess 1102, until the elastic plug joint 123 moves to the recessed hole on the substrate 3, at this time, the ventilation connector 16 connected to the tightening lower rod 122 regulated by the three-way valve 22 is closed, and the ventilation connector 16 connected to the tightening upper rod 121 is opened, and the elastic plug joint 123 of the tightening upper rod 121 starts to inflate, so as to blow out the powder at the recessed hole of the substrate 3, and at the same time, the worm motor 171 is started to work, the worm motor 171 drives the worm 172 to rotate, and the worm 172 drives the double-headed rotating rod 173 to rotate, and the double-headed rotating rod 17 3 rotates, driving the two outer sleeves 174 to move toward the double-headed rotating rod 173, that is, driving the tightening upper rod 121 downward and the tightening upper rod 121 upward until the elastic plug connector 123 is inserted into the concave hole of the substrate 3, and then the screw lifting assembly 9 works again, the lifting mounting seat 10 moves upward, and drives the clamped substrate 3 to move upward. After moving to the initial position, the rotating motor 18 starts to work, and the rotating motor 18 rotates, and the rotating side support plate 11, the substrate 3, the powder suction cover 13 and the negative pressure powder suction pipe 14 are driven by the rotating shaft 20 to rotate. At the same time, the rotating plate 19 rotates with it to ensure the connection between the negative pressure powder suction pipe 14 and the powder suction cover 13. During the rotation of the substrate 3, the powder on the substrate 3 falls downward to the powder suction cover 13 under the action of gravity and negative pressure wind force until the powder is removed.

[0060] After the powder is removed, the rotating motor 18 stops rotating, and after the substrate 3 returns to its initial position, the substrate 3 is transported downward to the top of the first push rod 8 again. Then, the worm motor 171 drives the tightening upper rod 121 and the tightening lower rod 122 to no longer tighten the substrate 3. The second push rod 21 extends, driving the tightening upper rod 121 and the tightening lower rod 122 to leave the substrate 3. Then, the lifting mounting seat 10 rises to its initial position again. Finally, the lifting cylinder 7 and the electric rail 5 first lift the powder suction outer box 2 and then move it away from the forming cylinder 102. The hatch 101 is opened to take out the substrate 3 and the parts.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-cleaning 3D printing device, comprising a printer cabin (1) and a forming cylinder (102) and a powder cylinder (103) arranged inside the printer cabin (1), characterized in that: A print head (4) is installed at the top of the interior of the printer cabin (1) just above the molding cylinder (102), and electric rails (5) are provided at the upper ends of the two side walls inside the printer cabin (1). A rail slide (6) is installed on each of the electric rails (5), and a powder suction box (2) is connected between the two rail slides (6). A lifting cylinder (7) for driving the powder suction box (2) to cover the molding cylinder (102) is installed at the ends of the two rail slides (6). A pad (105) and a lifting mechanism (104) for lifting the pad (105) are installed in the molding cylinder (102) and the powder cylinder (103), wherein a first push rod (8) is embedded in the top surface of the pad (105) located in the molding cylinder (102), and a base plate (3) is placed on the pad (105), and the bottom surface of the base plate (3) is clamped with the top of the first push rod (8); The bottom surface of the powder suction outer box (2) is open, and the ends of the inner side walls of the powder suction outer box (2) are both installed with a screw lifting assembly (9), and the two screw lifting assemblies (9) on the same side are connected to a lifting mounting seat (10), and the two lifting mounting seats (10) are rotatably connected to the side surfaces facing each other with a rotating side support plate (11), and a rotating motor (18) for driving the rotating side support plate (11) to rotate is installed on one of the lifting mounting seats (10), and a powder suction cover (13) covering the upper part of the base plate (3) is fixedly connected between the upper ends of the two rotating side support plates (11), and the upper and lower ends of each rotating side support plate (11) are symmetrically connected to a sliding clamping piece (12), and the interior of each rotating side support plate (11) is installed with a regulating sliding clamping piece (12) for moving up and down. A reciprocating lifting assembly (17) is provided inside each rotating side support plate (11), a second push rod (21) is also installed inside each rotating side support plate (11) for driving the corresponding sliding clamping member (12) to slide left and right, a powder blowing assembly (15) is connected between the multiple sliding clamping members (12) at the lower ends of the two rotating side support plates (11) for blowing air into the gap between the base plate (3) and the forming cylinder (102), a hollow rotating shaft (20) is fixedly installed in the middle of each rotating side support plate (11), a ventilation connecting member (16) is connected between the two sliding clamping members (12) at the upper end of each rotating side support plate (11) and between the two sliding clamping members (12) at the lower end, a three-way valve (22) is installed on the rotating shaft (20), and the ends of the two ventilation connecting members (16) are respectively connected to the three-way valve (22); A driven wheel (1101) is fixedly mounted on the outer side of one of the rotating shafts (20), a driving wheel meshing with the driven wheel (1101) is mounted on the output shaft of the rotating motor (18), and the driven wheel (1101) is located between the three-way valve (22) and the rotating side support plate (11); Both ends of the rotating side support plate (11) are provided with notches (1102) on the upper and lower sides for the sliding clamping member (12) to slide left and right, and the reciprocating lifting assembly (17) comprises a double-headed rotating rod (173) rotatably mounted between the upper and lower notches (1102), a worm motor (171) mounted on the inner wall of one side of the rotating side support plate (11), a worm (172) connected to the worm motor (171), and an outer sleeve (174) threadedly plugged into both ends of the double-headed rotating rod (173), a worm wheel adapted to the worm (172) is mounted in the middle of each of the double-headed rotating rods (173), and a limit cross plate inserted into the sliding clamping member (12) is fixedly connected to the top end of the outer sleeve (174); The sliding clamping member (12) comprises an upper tightening rod (121) and a lower tightening rod (122) fitted in the recess (1102); the same end of the upper tightening rod (121) and the lower tightening rod (122) is provided with an elastic plug connector (123) facing the recessed hole on the base plate (3); the other ends of the upper tightening rod (121) and the lower tightening rod (122) are provided with a telescopic rod (128); a connecting ring (124) is fixedly connected between the two telescopic rods (128); the end of the second push rod (21) is fixed to the connecting ring (124); and the upper tightening rod (121) and the lower tightening rod (122) are provided with a T-shaped sliding groove (125) on the opposite side thereof for sliding the limit horizontal plate; Both ends of the two side walls of the powder suction cover (13) and the rotating side support plate (11) are provided with through grooves (1301) for the upper rod (121) to slide up and down and left and right; The tightening upper rod (121) and the tightening lower rod (122) are both provided with ventilation grooves (126) therein, wherein an air blowing port connected to the ventilation groove (126) is provided on the elastic plug joint (123) at the end of the tightening upper rod (121), and a connecting cutout (127) connected to the ventilation groove (126) is provided in the middle of the bottom surface of the tightening lower rod (122), wherein the connecting cutout (127) is communicated with the powder blowing assembly (15), and the end of the ventilation connector (16) is inserted into the ventilation groove (126) in an aligning manner; The ventilation connector (16) comprises a T-shaped tube (161) and square connecting tubes (162) mounted at both ends of the top of the T-shaped tube (161); the square connecting tubes (162) are slidably inserted into the ventilation groove (126); and the bottom end of the T-shaped tube (161) is mounted on the valve port of the three-way valve (22).

2. A self-cleaning 3D printing device according to claim 1, characterized in that: The top end of the powder suction cover (13) is connected to a negative pressure powder suction pipe (14), a rotating plate (19) is rotatably mounted on one side wall of the powder suction outer box (2), an end of the negative pressure powder suction pipe (14) passes through the rotating plate (19) and is connected to a negative pressure vacuum pump, an end of the rotating shaft (20) is connected to an air intake pipe, and is connected to an inert gas air blower via the air intake pipe, and the air intake pipe and the negative pressure powder suction pipe (14) are both telescopic tubes.

3. A self-cleaning 3D printing device according to claim 1, characterized in that: A powder outlet (202) is installed at the top of the powder suction outer box (2), and air inlets (201) are provided at the bottom ends of both sides of the powder suction outer box (2). A plurality of air inlets (201) are connected to an inert gas storage tank via a pipeline, and the powder outlet (202) is connected to a powder material cylinder (103) via a pipeline.

4. A self-cleaning 3D printing device according to claim 1, characterized in that: The powder blowing assembly (15) comprises an outer ventilation tube (151) fitted and fixed at the connection cutout (127), an inner ventilation tube (152) connected between the two outer ventilation tubes (151), and an air blowing tube (153) installed at the bottom of the outer ventilation tube (151) and the inner ventilation tube (152), wherein the top end of the outer ventilation tube (151) is provided with a through hole at the connection cutout (127), and the bottom end of the air blowing tube (153) is inclined toward the gap between the base plate (3) and the molding cylinder (102).

Images