CN110842197A

CN110842197A - Automatic powder blanking and spreading device of 3D printing equipment

Info

Publication number: CN110842197A
Application number: CN201911097248.3A
Authority: CN
Inventors: 陈礼成
Original assignee: Pinghu Chaokai Technology Co Ltd
Current assignee: Pinghu Chaokai Technology Co Ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-02-28

Abstract

The invention relates to the technical field of 3D printing, in particular to an automatic powder blanking and spreading device of 3D printing equipment, which comprises a sliding table, the feeding box and the blanking box are fixedly arranged on the movable part of the sliding table, a linear driver for driving the blanking box to slide along the sliding table in a reciprocating mode is arranged at the bottom of the blanking box, the feeding box is fixedly arranged at the top of the blanking box, a conveying mechanism which is horizontally arranged and extends from one end of the feeding box to the other end of the blanking box in a working area is arranged on the feeding box, a feeding opening communicated to the inside of the feeding box is formed in the top of the blanking box, a rotary opening and closing door for sealing the feeding opening is arranged between the feeding box and the blanking box, a discharging opening which is located right above a powder falling area of the 3D printing equipment is formed in the bottom of the blanking box, an air pressure opening and closing door for sealing the discharging opening is arranged at the bottom of the blanking box; the automatic blanking and spreading device can continuously feed and discharge materials and has uniform blanking.

Description

Automatic powder blanking and spreading device of 3D printing equipment

Technical Field

The invention relates to the technical field of 3D printing, in particular to an automatic powder blanking and spreading device of 3D printing equipment.

Background

When the metal 3D printer is formed, firstly, a layer of powder material is paved on a workbench by a powder paving system of a feeding device, then, under the control of a computer, a laser beam scans the powder of an entity part according to the information of the cross section profile, the temperature of the powder is raised to be higher than a melting point, the temperature of the scanned powder is lowered to be lower than the melting point after the scanned powder is melted, a sintering surface is obtained by mutual bonding, and the powder in a non-scanning area is still loose and is used as a support for a workpiece and the next layer of powder. After one layer is formed, the workbench descends by the height of one layer, then the material spreading and forming of the next layer are carried out, the three-dimensional solid part is finally formed in such a circulating mode, the existing device is designed to adopt a double-cylinder structure with one working cylinder and one feeding cylinder, and the powder spreading rollers which provide the vertical reciprocating motion of the feeding cylinder and the horizontal reciprocating motion on the working cylinder are mutually matched to realize the powder spreading action.

Because metal 3D printer equipment generally adopts the high-power fiber laser of more than 500W, behind laser output beam expander mirror and the dynamic focus unit, realize the scanning of x, y axle direction by two scanning galvanometers, if there is the tiny dust on the lens that the light beam passes through in this light path all can cause the burnout of lens, so to have very high requirement to laser scanning system's sealed.

The working cylinder and the feeding cylinder are fixed on the main frame, in the processing process, after one-layer scanning is finished, the working cylinder piston and the feeding cylinder piston respectively move up and down by a distance of the thickness of a processing layer sheet under the driving of the working cylinder motor and the feeding motor, and the powder material pushed out of the feeding cylinder is pushed to the upper side of the working cylinder by the powder paving mechanism to uniformly form a layer of powder layer to be melted.

If rapid prototyping is carried out in atmospheric environment, the surface and internal performance of the molded part can be greatly influenced due to the existence of oxidation, and the mechanical performance and the physical performance of the molded part are seriously influenced, so that the working chamber must be pre-vacuumized, argon or nitrogen protective gas needs to be added, and a gas purification device is provided, so that the laser scanning system can work in a dust-free state.

The feedway that current metal 3D printer used is for guaranteeing that the processing product is not by oxidation, uses evacuating device together feed jar and shaping cabin, leads to feedway bulky, and current feedway is because the evacuation time is longer, and it is lower to cause equipment production efficiency.

The existing rapid forming powder supply method is characterized in that powder is supplied to a supply cylinder, the powder loading amount of the supply cylinder is far larger than the powder amount required by forming, and redundant powder is collected after forming is finished so as to prevent metal powder from being oxidized due to contact with air, so that the workload is large; because the metal powder in the feeding cylinder has more surplus, the metal powder is easy to oxidize in the process of opening the sealing cabin door to take the product after the production of the metal powder is finished; the volume of the molding sealed cabin is large, the requirement can be met only by long time for vacuumizing, and the production efficiency is easily influenced; due to the presence of the feed cylinder, the apparatus is bulky.

Chinese patent CN109570505A discloses a metal powder feeding device and a 3D printer, the metal powder feeding device comprises a mounting bracket, a paving component and a feeding component, the paving component comprises a paving plate and a scraper, the paving plate is mounted on the mounting bracket, the scraper is slidably mounted at one end of the paving plate and is enclosed with the paving plate to form a paving area, each feeding component comprises a bin and a vibrating motor, the vibrating motor is mounted on the bin, one end of the bin is mounted on the mounting bracket and is positioned above one end of the paving plate, the other end of the bin is provided with a discharge hole for discharging materials towards the paving area, the bin is provided with an adjusting part for adjusting the size of the discharge hole, when in use, the vibrating motor is controlled to be started or closed by adjusting the size of the discharge hole, the adding amount of metal powder into the paving area can be realized, and the purpose of quantitative feeding into the paving area is realized, effectively reduce the waste of materials and improve the accuracy of feeding.

The metal powder feedway that this patent disclosed only through vibration unloading, along with the diminishing gradually of powder in the box body, unloading speed also can reduce, causes the inhomogeneous problem of stone.

Disclosure of Invention

The invention aims to provide an automatic powder blanking and spreading device of 3D printing equipment, which can continuously feed and discharge materials and uniformly blank materials.

In order to achieve the purpose, the invention adopts the following technical scheme:

provides an automatic powder blanking and spreading device of 3D printing equipment, which comprises a sliding table, go up magazine and blanking box, slip table fixed mounting is in the both sides of 3D printing apparatus powder falling interval, blanking box fixed mounting is on the movable part of slip table, the straight line driver of drive blanking box along slip table reciprocating sliding is installed to blanking box bottom, it is at blanking box's top to go up magazine fixed mounting, it places and the work interval extends to the conveying mechanism of the last magazine other end from the one end of last magazine to go up to be provided with the level on the blanking box, the pan feeding mouth that feeds through to the inside of magazine is seted up at blanking box's top, it is provided with the rotatory opening and closing door of sealed pan feeding mouth to go up between magazine and the blanking box, the discharge gate that is located directly over 3D printing apparatus powder falling interval is seted up to blanking box's bottom, the atmospheric pressure switching door of sealed discharge gate is installed to blanking box's bottom, install.

As an optimal scheme of the automatic powder blanking and spreading device of the 3D printing equipment, the linear driver comprises a rack, a first servo motor and a gear, the rack is fixedly installed beside a powder falling section of the 3D printing equipment and is parallel to the sliding table, the first servo motor is fixedly installed at the bottom of the powder falling box, the gear is fixedly installed on an output shaft of the first servo motor, and the rack is meshed with the gear.

As a preferred scheme of 3D printing apparatus's automatic blanking stone device of powder, go up the magazine including the roof, perisporium and bottom plate, the roof level sets up, the perisporium is from the vertical downwardly extending in edge of roof, the bottom plate level sets up and with the bottom fixed connection of perisporium, the section of bottom plate is half circular form, the centre of bottom plate is provided with the first opening that feeds through to blanking box, first opening is rectangular shape, one side at the top of roof is provided with the pan feeding mouth that runs through the roof and feeds through to the inside of supreme magazine.

As a preferred scheme of the automatic powder blanking and spreading device of the 3D printing equipment, the feeding box further comprises a visual window, and the visual window is installed on the top plate in an embedded mode.

As a preferred scheme of the automatic powder blanking and spreading device of the 3D printing equipment, the conveying mechanism comprises a second servo motor and a screw rod, the second servo motor is fixedly installed at one end of the outer portion of the feeding box, the screw rod is rotatably installed in the feeding box, and an input shaft of the screw rod is in transmission connection with an output shaft of the second servo motor.

As an optimal scheme of the automatic powder blanking and spreading device of the 3D printing equipment, the rotary opening and closing door comprises a connecting piece and a sealing strip, the sealing strip is fixedly connected with the screw rod through the connecting piece, the connecting piece is arranged at two ends of the sealing strip, the cross section of the sealing strip is in a fan ring shape, and in the working state, the sealing strip is located under the screw rod and blocks the first opening.

As an optimal scheme of 3D printing apparatus's automatic blanking stone device of powder, the blanking box is including riser, swash plate, bottom plate, strengthening rib, and the riser extends along the vertical downwardly extending in base of perisporium, and the swash plate is downward and inwards extending along the base slope of riser, and the bottom plate extends along the base level of swash plate outwards, and the vertical setting of a plurality of strengthening ribs is and the base of fixed connection riser and the side of bottom plate.

As an optimal scheme of the automatic powder blanking and spreading device of the 3D printing equipment, the air injection mechanism comprises an air source, a valve and a plurality of nozzles, the nozzles are arranged on the inclined plate side by side, the nozzles penetrate through the inclined plate, and the air source is communicated with the air inlet end of the nozzles through the valve.

As an optimal scheme of the automatic powder blanking and spreading device of the 3D printing equipment, the air pressure opening and closing door comprises a bearing seat fixedly installed at the bottom end of the blanking box and located on two sides of the discharge port respectively, a rotating shaft is rotatably installed on the bearing seat, a sealing plate is fixedly installed on the rotating shaft, a rubber pad is fixedly installed on one surface of the sealing plate, facing the blanking box, and a rebound part fixedly installed at the bottom of the blanking box and driving the sealing plate to cover the discharge port is arranged beside the sealing plate.

As an optimal scheme of the automatic powder blanking and spreading device of the 3D printing equipment, the rebounding part comprises a driving rod, a torsion spring seat and a torsion spring, the driving rod is parallel to the rotating shaft and is fixedly connected with the sealing plate, the torsion spring seat is fixedly installed at the bottom of the blanking box, and two ends of the torsion spring are fixedly connected with the driving rod and the torsion spring seat respectively.

The invention has the beneficial effects that:

the sliding table is used for guiding the blanking box to slide in the direction right above the powder falling area of the 3D printing device, the linear driver is used for driving the blanking box to horizontally move along the sliding table, the feeding box is used for conveying powder to the blanking box, the conveying mechanism is used for uniformly filling the powder in the feeding box to each part of the feeding box, the rotary opening and closing door is used for opening and closing the feeding port of the blanking box, the air pressure opening and closing door is used for opening and closing the discharging port of the blanking box, the air injection mechanism is used for injecting air to the inside of the blanking box to enable the powder in the blanking box to be in an atomized state, during blanking, the linear driver drives the blanking box to move from one side to the other side of the powder falling area of the 3D printing device, the rotary opening and closing door closes the feeding port of the blanking box, the air injection mechanism injects air to the inside of the blanking box to enable the powder in the blanking box to be uniformly atomized, after the powder is dropped, the gas injection mechanism is closed, the gas pressure opening and closing door is also closed under the condition that the interior of the blanking box is not high-pressure, and the conveying mechanism and the rotary opening and closing door are opened simultaneously to convey the powder in the feeding box to the interior of the blanking box.

1. The automatic blanking and spreading device can continuously feed and discharge materials;

2. the automatic blanking and spreading device has uniform blanking.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a perspective view of an automatic powder blanking and spreading device of a 3D printing apparatus according to an embodiment of the present invention;

FIG. 2 is a side view of an automatic powder blanking and spreading device of a 3D printing apparatus according to an embodiment of the invention;

fig. 3 is an exploded perspective view of an automatic powder blanking and spreading device of a 3D printing apparatus according to an embodiment of the present invention;

FIG. 4 is a top view of an automatic powder blanking and spreading device of a 3D printing apparatus according to an embodiment of the present invention;

FIG. 5 is a sectional view taken along line A-A of FIG. 4;

FIG. 6 is a perspective view of FIG. 5;

FIG. 7 is a sectional view taken along line B-B of FIG. 4;

FIG. 8 is a perspective view of FIG. 7;

fig. 9 is a perspective view of an opening side plate of an automatic powder blanking and spreading device of a 3D printing apparatus according to an embodiment of the invention;

fig. 10 is a perspective view of a hidden sliding table of an automatic powder blanking and spreading device of a 3D printing apparatus according to an embodiment of the present invention;

FIG. 11 is an enlarged view of a portion of FIG. 10 at C;

in the figure:

1. a sliding table;

2. a linear actuator; 2a, a rack; 2b, a first servo motor; 2c, a gear;

3. feeding a material box; 3a, a top plate; 3b, a peripheral wall; 3c, a bottom plate; 3c1, first opening; 3d, a feeding port; 3e, a visual window;

4. a conveying mechanism; 4a, a second servo motor; 4b, a screw rod;

5. rotating the opening and closing door; 5a, a connecting piece; 5b, a seal;

6. a blanking box; 6a, a vertical plate; 6b, a sloping plate; 6c, a bottom plate; 6d, reinforcing ribs;

7. an air injection mechanism; 7a, a nozzle;

8. a pneumatic opening and closing door; 8a, a bearing seat; 8b, a rotating shaft; 8c, sealing plates; 8c1, rubber pad; 8d, a rebound piece; 8d1, drive lever; 8d2, torsion spring seat; 8d3, torsion spring.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and the specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being fixed or detachable or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 11, an automatic powder blanking and spreading device of a 3D printing device comprises a sliding table 1, an upper material box 3 and a blanking box 6, wherein the sliding table 1 is fixedly installed at two sides of a powder falling section of the 3D printing device, the blanking box 6 is fixedly installed at a movable part of the sliding table 1, a linear driver 2 for driving the blanking box 6 to slide back and forth along the sliding table 1 is installed at the bottom of the blanking box 6, the upper material box 3 is fixedly installed at the top of the blanking box 6, the upper material box 3 is provided with a conveying mechanism 4 which is horizontally placed and extends from one end of the upper material box 3 to the other end of the upper material box 3 in a working section, the top of the blanking box 6 is provided with a material inlet communicated with the inner part of the upper material box 3, a rotary opening and closing door 5 for closing the material inlet is arranged between the upper material box 3 and the blanking box 6, the bottom of the blanking box 6 is provided with an air pressure opening and closing door 8 for sealing the discharge hole, and the blanking box 6 is provided with an air injection mechanism 7 with a working end positioned inside the blanking box 6.

The sliding table 1 is used for guiding the blanking box 6 to slide in the direction right above the powder falling area of the 3D printing device, the linear driver 2 is used for driving the blanking box 6 to horizontally move along the sliding table 1, the feeding box 3 is used for conveying powder to the blanking box 6, the conveying mechanism 4 is used for uniformly filling the powder in the feeding box 3 to each part of the feeding box 3, the rotary opening and closing door 5 is used for opening and closing a feeding port of the blanking box 6, the pneumatic opening and closing door 8 is used for opening and closing a discharging port of the blanking box 6, the air injection mechanism 7 is used for injecting air into the blanking box 6 to enable the powder in the blanking box 6 to be in an atomized state, during blanking, the linear driver 2 drives the blanking box 6 to move from one side to the other side of the powder falling area of the 3D printing device, the rotary opening and closing door 5 seals the feeding port of the blanking box 6, and the air injection mechanism 7 injects air into the blanking box, meanwhile, the air pressure driving air pressure opening and closing door 8 is opened, uniformly atomized powder falls onto a powder falling section of the 3D printing equipment through the discharge port, the air injection mechanism 7 is closed after powder falling is finished, the air pressure opening and closing door 8 is closed under the condition that the interior of the blanking box 6 is not high-pressure, and the conveying mechanism 4 and the rotary opening and closing door 5 are simultaneously opened to convey the powder inside the feeding box 3 to the interior of the blanking box 6.

The linear driver 2 comprises a rack 2a, a first servo motor 2b and a gear 2c, the rack 2a is fixedly installed on the side of a powder falling section of the 3D printing device and is parallel to the sliding table 1, the first servo motor 2b is fixedly installed at the bottom of the powder falling box 6, the gear 2c is fixedly installed on an output shaft of the first servo motor 2b, and the rack 2a is meshed with the gear 2 c.

The first servo motor 2b works to drive the gear 2c to rotate on the rack 2a, so that the first servo motor 2b is driven to drive the blanking box 6 to horizontally slide on the sliding table 1 through the meshing of the rack 2a and the gear 2 c.

Go up magazine 3 including roof 3a, perisporium 3b and bottom plate 3c, roof 3a level sets up, perisporium 3b is from the vertical downwardly extending in edge of roof 3a, bottom plate 3c level sets up and with perisporium 3 b's bottom fixed connection, bottom plate 3 c's section is half ring shape, bottom plate 3 c's centre is provided with the first opening 3c1 who communicates to blanking box 6, first opening 3c1 is rectangular shape, one side at roof 3 a's top is provided with the pan feeding mouth 3d that runs through roof 3a and communicate to magazine 3 inside.

The top plate 3a, the peripheral wall 3b and the bottom plate 3c form a box body with a funnel-shaped section, the box body is fed through a feeding port 3d located on one side of the top of the box body, the box body is discharged through a first opening 3c1 communicated with the feeding box 3 and the blanking box 6, the first opening 3c1 is the feeding port of the blanking box 6, after powder is injected through the feeding port 3d, the powder entering one side of the feeding box 3 is uniformly conveyed to each position inside the feeding box 3 by the conveying mechanism 4, and then the door 5 is opened by rotating to enable the powder uniformly dispersed inside the feeding box 3 to enter the blanking box 6 through the first opening 3c 1.

The upper material box 3 also comprises a visual window 3e, and the visual window 3e is embedded on the top plate 3 a.

The visual window 3e can be used for the staff to observe the condition of the material stored inside the feeding box 3, so as to judge whether the feeding mechanism 4 uniformly fills the powder material in each position of the feeding box 3.

The conveying mechanism 4 comprises a second servo motor 4a and a screw rod 4b, the second servo motor 4a is fixedly installed at one end of the outer portion of the feeding box 3, the screw rod 4b is rotatably installed in the feeding box 3, and an input shaft of the screw rod 4b is in transmission connection with an output shaft of the second servo motor 4 a.

The second servo motor 4a and the screw rod 4b are combined to form a common screw feeder, and the powder inside the feeding box 3 is conveyed from one end to the other end of the feeding box through a screw blade.

The rotary opening and closing door 5 comprises a connecting piece 5a and a seal 5b, the seal 5b is fixedly connected with the screw rod 4b through the connecting piece 5a, the connecting piece 5a is arranged at two ends of the seal 5b, the cross section of the seal 5b is in a fan-ring shape, and in the working state, the seal 5b is positioned right below the screw rod 4b and blocks the first opening 3c 1.

When the second servo motor 4a works, the screw rod 4b and the seal 5b rotate together, the screw rod 4b conveys powder to the other end of the upper material box 3 from one end of the upper material box 3, meanwhile, the seal 5b continuously opens and closes the first opening 3c1, a worker penetrates through the interior of the upper material box 3 through the visual window 3e, the conveying mechanism 4 is closed when the upper material box 3 or the blanking box 6 is judged to be filled with the powder, and meanwhile, the seal 5b seals the first opening 3c 1.

The blanking box 6 comprises a vertical plate 6a, an inclined plate 6b, a bottom plate 6c and reinforcing ribs 6d, wherein the vertical plate 6a vertically extends downwards along the bottom edge of the peripheral wall 3b, the inclined plate 6b obliquely extends downwards and inwards along the bottom edge of the vertical plate 6a, the bottom plate 6c horizontally extends outwards along the bottom edge of the inclined plate 6b, and the reinforcing ribs 6d are vertically arranged and fixedly connected with the bottom edge of the vertical plate 6a and the side edge of the bottom plate 6 c.

The vertical plate 6a and the inclined plate 6b are combined into a box body with a funnel-shaped section, and the bottom plate 6c and the reinforcing ribs 6d are combined into a support for supporting the funnel-shaped box body, so that the blanking box 6 can be fixedly arranged on the movable part of the sliding table 1.

The air injection mechanism 7 comprises an air source, a valve and a plurality of nozzles 7a, the nozzles 7a are arranged on the inclined plate 6b side by side, the nozzles 7a penetrate through the inclined plate 6b, and the air source is communicated with the air inlet end of the nozzles 7a through the valve.

The air supply can be high-pressure gas cylinder group, and high-pressure gas cylinder passes through valve switch such as solenoid valve to nozzle 7a air feed, and nozzle 7a is atomizer, and nozzle 7a spouts the powder that blanking box 6 inside was stored into the fog attitude for the inside powder evenly distributed of blanking box 6 can the even ejection of compact.

The pneumatic opening and closing door 8 comprises a bearing seat 8a which is fixedly installed at the bottom end of the blanking box 6 and is respectively positioned at two sides of the discharging hole, a rotating shaft 8b is rotatably installed on the bearing seat 8a, a sealing plate 8c is fixedly installed on the rotating shaft 8b, a rubber pad 8c1 is fixedly installed on the sealing plate 8c towards one surface of the blanking box 6, and a rebound part 8d which is fixedly installed at the bottom of the blanking box 6 and drives the sealing plate 8c to cover the discharging hole is arranged beside the sealing plate 8 c.

Rebound part 8d is rotatory through the axis that pivot 8b encircles bearing frame 8a through the resilience force drive shrouding 8c of self, and shrouding 8c is rotatory towards the direction that the cover covers the discharge gate all the time, and under the non-ejection of compact state, shrouding 8c seals the discharge gate tightly through rubber pad 8c1 for the powder of blanking box 6 inside can't pass through the discharge gate whereabouts.

The resilient member 8d comprises a driving rod 8d1, a torsion spring seat 8d2 and a torsion spring 8d3, the driving rod 8d1 is parallel to the rotating shaft 8b and is fixedly connected with the sealing plate 8c, the torsion spring seat 8d2 is fixedly installed at the bottom of the blanking box 6, and two ends of the torsion spring 8d3 are fixedly connected with the driving rod 8d1 and the torsion spring seat 8d2 respectively.

The torsion spring 8d3 is fixedly mounted on the torsion spring seat 8d2, the torsion spring 8d3 outputs a force for driving the torsion spring to be away from the blanking box 6 towards the driving rod 8d1 through self resilience force, and the working part of the sealing plate 8c and the driving rod 8d1 are respectively positioned at two sides of the rotating shaft 8b, so that the sealing plate 8c can move towards the blanking box 6.

The working principle of the invention is as follows:

the sliding table 1 is used for guiding the falling material box 6 to slide in the direction right above the powder falling area of the 3D printing device, the linear driver 2 is used for driving the falling material box 6 to horizontally move along the sliding table 1, and the feeding box 3 is used for conveying powder to the falling material box 6;

powder is injected through the feeding port 3d, the second servo motor 4a and the spiral rod 4b are combined into a common spiral feeder, the powder in the feeding box 3 is conveyed from one end to the other end of the feeding box through a spiral blade, when the second servo motor 4a works, the spiral rod 4b and the seal 5b rotate together, the spiral rod 4b conveys the powder from one end of the feeding box 3 to the other end of the feeding box 3, meanwhile, the seal 5b continuously opens and closes the first opening 3c1, a worker penetrates through the feeding box 3 through the visual window 3e, the conveying mechanism 4 is closed when the powder is judged to be filled in the feeding box 3 or the blanking box 6, and meanwhile, the seal 5b seals the first opening 3c 1;

the gas source can be a high-pressure gas cylinder group, the high-pressure gas cylinder supplies gas to the nozzle 7a through a valve switch such as an electromagnetic valve, the nozzle 7a is an atomizing spray head, and the nozzle 7a sprays the powder stored in the blanking box 6 into an atomizing state, so that the powder in the blanking box 6 is uniformly distributed and can be uniformly discharged;

the air injection mechanism 7 injects air to enable the air pressure inside the blanking box 6 to rise, the high-pressure driving sealing plate 8c overcomes the resilience force of the rebound part 8D to be opened, uniformly atomized powder falls onto a powder falling interval of the 3D printing equipment through the discharge port, the air injection mechanism 7 is closed after the powder falling is finished, the air pressure opening and closing door 8 is also closed along with the air pressure opening and closing door 8 under the condition that the inside of the blanking box 6 is not high in pressure, and the conveying mechanism 4 and the rotary opening and closing door 5 are opened simultaneously to convey the powder inside the feeding box 3 to the inside of the blanking box 6.

It should be understood that the above-described embodiments are merely preferred embodiments of the invention and the technical principles applied thereto. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, such variations are within the scope of the invention as long as they do not depart from the spirit of the invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.

Claims

1. An automatic powder blanking and spreading device of a 3D printing device is characterized by comprising a sliding table (1), a feeding box (3) and a blanking box (6), wherein the sliding table (1) is fixedly arranged at two sides of a powder blanking interval of the 3D printing device, the blanking box (6) is fixedly arranged on a movable part of the sliding table (1), a linear driver (2) for driving the blanking box (6) to slide along the sliding table (1) in a reciprocating manner is arranged at the bottom of the blanking box (6), the feeding box (3) is fixedly arranged at the top of the blanking box (6), a conveying mechanism (4) which is horizontally arranged and a working interval of which extends from one end of the feeding box (3) to the other end of the feeding box (3) is arranged on the feeding box (3), a feeding port communicated with the inner part of the feeding box (3) is formed at the top of the blanking box (6), and a rotary opening and closing door (5) for sealing the feeding port is arranged between the feeding box (, the bottom of the blanking box (6) is provided with a discharge port located right above a powder falling section of the 3D printing equipment, the bottom of the blanking box (6) is provided with an air pressure opening and closing door (8) for sealing the discharge port, and the blanking box (6) is provided with an air injection mechanism (7) with a working end located inside the blanking box (6).

2. The automatic powder blanking and spreading device for the 3D printing equipment according to claim 1, wherein the linear driver (2) comprises a rack (2 a), a first servo motor (2 b) and a gear (2 c), the rack (2 a) is fixedly installed beside a powder falling section of the 3D printing equipment and is parallel to the sliding table (1), the first servo motor (2 b) is fixedly installed at the bottom of the powder falling box (6), the gear (2 c) is fixedly installed on an output shaft of the first servo motor (2 b), and the rack (2 a) is meshed with the gear (2 c).

3. The automatic powder blanking and spreading device of the 3D printing equipment is characterized in that the upper material box (3) comprises a top plate (3 a), a peripheral wall (3 b) and a bottom plate (3 c), the top plate (3 a) is horizontally arranged, the peripheral wall (3 b) vertically extends downwards from the edge of the top plate (3 a), the bottom plate (3 c) is horizontally arranged and is fixedly connected with the bottom end of the peripheral wall (3 b), the section of the bottom plate (3 c) is in a semicircular shape, a first opening (3 c 1) communicated with the material dropping box (6) is formed in the middle of the bottom plate (3 c), the first opening (3 c 1) is in an elongated shape, and a material inlet (3D) communicated with the interior of the upper material box (3) through the top plate (3 a) is formed in one side of the top plate (3 a).

4. The automatic powder blanking and spreading device of the 3D printing equipment as claimed in claim 3, wherein the upper material box (3) further comprises a visual window (3 e), and the visual window (3 e) is embedded in the top plate (3 a).

5. The automatic powder blanking and spreading device for the 3D printing equipment according to claim 4, wherein the conveying mechanism (4) comprises a second servo motor (4 a) and a screw rod (4 b), the second servo motor (4 a) is fixedly installed at one end outside the feeding box (3), the screw rod (4 b) is rotatably installed inside the feeding box (3), and an input shaft of the screw rod (4 b) is in transmission connection with an output shaft of the second servo motor (4 a).

6. The automatic powder blanking and spreading device for the 3D printing equipment is characterized in that the rotary opening and closing door (5) comprises a connecting piece (5 a) and a sealing strip (5 b), the sealing strip (5 b) is fixedly connected with the screw rod (4 b) through the connecting piece (5 a), the connecting piece (5 a) is arranged at two ends of the sealing strip (5 b), the cross section of the sealing strip (5 b) is in a fan-ring shape, and in the working state, the sealing strip (5 b) is located right below the screw rod (4 b) and blocks the first opening (3 c 1).

7. The automatic powder blanking and spreading device for the 3D printing equipment is characterized in that the blanking box (6) comprises a vertical plate (6 a), an inclined plate (6 b), a bottom plate (6 c) and reinforcing ribs (6D), wherein the vertical plate (6 a) extends vertically and downwards along the bottom edge of the peripheral wall (3 b), the inclined plate (6 b) extends obliquely and downwards and inwards along the bottom edge of the vertical plate (6 a), the bottom plate (6 c) extends horizontally and outwards along the bottom edge of the inclined plate (6 b), and the reinforcing ribs (6D) are vertically arranged and fixedly connected with the bottom edge of the vertical plate (6 a) and the side edge of the bottom plate (6 c).

8. The automatic powder blanking and spreading device for the 3D printing equipment is characterized in that the air injection mechanism (7) comprises an air source, a valve and a plurality of nozzles (7 a), the nozzles (7 a) are arranged on an inclined plate (6 b) side by side, the nozzles (7 a) are arranged through the inclined plate (6 b), and the air source is communicated with the air inlet ends of the nozzles (7 a) through the valve.

9. The automatic powder blanking and spreading device for the 3D printing equipment as claimed in claim 1, wherein the pneumatic opening and closing door (8) comprises bearing seats (8 a) fixedly installed at the bottom end of the blanking box (6) and respectively located at two sides of the discharge port, a rotating shaft (8 b) is rotatably installed on the bearing seats (8 a), a sealing plate (8 c) is fixedly installed on the rotating shaft (8 b), a rubber pad (8 c 1) is fixedly installed on one side, facing the blanking box (6), of the sealing plate (8 c), and a resilient member (8D) fixedly installed at the bottom of the blanking box (6) and driving the sealing plate (8 c) to cover the discharge port is arranged beside the sealing plate (8 c).

10. The automatic powder blanking and spreading device of the 3D printing equipment as claimed in claim 9, wherein the resilient member (8D) comprises a driving rod (8D 1), a torsion spring seat (8D 2) and a torsion spring (8D 3), the driving rod (8D 1) is parallel to the rotating shaft (8 b) and is fixedly connected with the sealing plate (8 c), the torsion spring seat (8D 2) is fixedly installed at the bottom of the blanking box (6), and two ends of the torsion spring (8D 3) are respectively fixedly connected with the driving rod (8D 1) and the torsion spring seat (8D 2).