CN113352612B - Bidirectional powder feeding mechanism for 3D printer - Google Patents
Bidirectional powder feeding mechanism for 3D printer Download PDFInfo
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- CN113352612B CN113352612B CN202110665444.7A CN202110665444A CN113352612B CN 113352612 B CN113352612 B CN 113352612B CN 202110665444 A CN202110665444 A CN 202110665444A CN 113352612 B CN113352612 B CN 113352612B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/214—Doctor blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention provides a bidirectional powder feeding mechanism for a 3D printer, which comprises a powder hopper, a powder dividing mechanism and a powder feeding mechanism, wherein the bottom of the powder hopper is embedded above the powder dividing mechanism, and the powder feeding mechanism is arranged right below the powder dividing mechanism; the powder feeding mechanism comprises a sleeve plate arranged right below the powder dividing mechanism and a bidirectional separating guide strip fixedly arranged in the middle of the sleeve plate, and the powder feeding mechanism can output powder twice through the powder dividing mechanism when the powder dividing mechanism is at an initial position, and the output powder comprises forward paved powder and powder reserved during reverse paving, so that when the scraper is in contact with the powder, namely enters a paving state, the paving state can be continuously kept until the unidirectional powder paving is finished, the bidirectional powder paving can keep the state, the powder paving stability is high, redundant lines cannot be generated, the scraper has a good working environment, and the appearance attractiveness of a workpiece is improved.
Description
Technical Field
The invention belongs to the field of 3D printers, and particularly relates to a bidirectional powder feeding mechanism for a 3D printer.
Background
The 3D printing technology, which may also be referred to as additive manufacturing technology, achieves printing of the three-dimensional model by automating the process of numerical control layer-by-layer material accumulation. Compared with the traditional processing technology, the 3D printing technology does not need to additionally manufacture a die, and the finished product is directly processed. The special structural obstacle which cannot be realized by the traditional mechanical processing can be overcome, the simplified production of any complex structural component can be realized, the design idea can be automatically, directly and accurately converted from a CAD model into a model or a device with a certain function, and the 3D printer needs to perform powder paving treatment on a powder bed before printing.
Based on the above description, the inventor finds that the existing bidirectional powder feeding mechanism for a 3D printer mainly has the following disadvantages, for example:
the existing bidirectional powder feeding mechanism needs to be stopped to supplement powder in the process of paving in the direction, then powder is carried to be paved, and in the paving surface of the powder bed, the doctor blade is stopped to supplement the powder in the paving process and then continuously paving the powder, an obvious powder redundant line is formed on the powder bed at the position before and after the doctor blade is stopped during the period, the irreversible arrangement is formed after laser solidification, and the doctor blade is easy to interfere with the solidified redundant line in the reverse paving process.
Disclosure of Invention
In order to solve the technical problems, the invention provides a bidirectional powder feeding mechanism for a 3D printer, which aims to solve the problems that in the conventional bidirectional powder feeding mechanism, powder is required to be stopped for supplementing and then powder is carried for paving in the paving process, as in the paving surface of a powder bed, a doctor is stopped for supplementing the powder in the paving process and then continuously paving the powder, an obvious powder redundant line is formed on the powder bed at the front and rear positions of the doctor before and after the doctor is stopped, the irreversible arrangement is formed after laser solidification, and the doctor is easy to interfere with the solidified redundant line in the reverse paving process.
Aiming at the defects of the prior art, the invention discloses a bidirectional powder feeding mechanism for a 3D printer, which is aimed at and has the effects as follows: a two-way powder mechanism that send for 3D printer includes: the powder hopper is embedded above the powder distributing mechanism at the bottom of the powder hopper, and the powder feeding mechanism is arranged right below the powder distributing mechanism;
the powder feeding mechanism comprises a sleeve plate arranged right below the powder dividing mechanism, a bidirectional separating guide strip fixedly arranged at the middle part in the sleeve plate, a material blocking mechanism arranged right below the bidirectional separating guide strip, a bidirectional separating and discharging plate arranged below the material blocking mechanism and a scraper mechanism arranged below the bidirectional separating and discharging plate; the bidirectional separation guide strip, the sleeve plate and the material blocking mechanism are surrounded to form a first storage bin and a second storage bin which are symmetrically arranged; the powder distribution mechanism is used for respectively throwing equal amounts of materials into the first storage bin and the second storage bin; the material blocking mechanism is used for controlling the first storage bin to discharge powder when the powder feeding mechanism is at an initial position, so that powder is fed to the scraper mechanism through one side of the bidirectional separating and discharging plate; and the material blocking mechanism is used for controlling the second storage bin to discharge powder when the powder feeding mechanism moves to the limit position, so that the powder is fed to the scraper mechanism through the other side of the bidirectional separating and discharging plate.
As a further optimization, the dam mechanism includes: the device comprises a baffle plate, a locking block and a guide rod, wherein the baffle plate is penetrated with a discharging slot hole, the locking block is fixedly arranged on the baffle plate, the guide rod penetrates through the locking block, a spring is sleeved at one end of the guide rod and props against the locking block, and a thimble; the spring is used for resetting the baffle when the powder feeding mechanism is at an initial position, so that a discharge slot hole of the baffle is opposite to the first storage bin for discharging powder; and the thimble is used for propping against the baffle plate to compress the spring when the powder feeding mechanism moves to the limit position, so that the discharge slot hole of the baffle plate is opposite to the second storage bin for discharging powder.
As further optimization, the locking blocks are symmetrically arranged on two sides of the baffle, and the locking blocks are accommodated in the accommodating cavity at the bottom of the sleeve plate, so that the volume is reduced.
As further optimization, the scraper mechanism comprises a cutter locking bar, a side auxiliary bar and a blade which is clamped between the cutter locking bar and the bottom of the side auxiliary bar, wherein the top end of the cutter locking bar is fixedly arranged below the bidirectional separating and unloading plate; the top of the side auxiliary strip is fixedly arranged on the cutter locking strip.
As a further optimization, divide powder mechanism including set up in powder hopper below, and run through the hopper lock plate that has the feed chute, set up in the powder guiding sleeve piece of hopper lock plate under, set up in the powder discharging sleeve piece inside arranges the powder roller shell, set up in two the powder roller of arranging the cladding in the middle of the powder roller shell, set up in the T locking plate of powder guiding sleeve piece both sides, and set up in the powder guiding sleeve piece side and with the motor element that powder roller machinery is connected, the hopper lock plate is used for accepting the material that the powder hopper put in, its material falls into two arrange in the empty slot of powder roller shell top, wherein, it is equipped with two sets of bar through-holes to lead powder sleeve piece below, motor element through the drive powder roller clockwise rotation, bar groove on the powder roller can carry through the powder that the lock plate falls down, the powder is in the back of powder roller rotation is in the bar groove on the right side of powder guiding sleeve piece, and to the powder feeding mechanism is powder, and when motor element control the powder roller rotation receives the powder roller, the powder roller control device falls into the left side of powder roller and the powder roller can fall into the left side of the bar groove.
As further optimization, the bottom of the powder discharge roller sleeve is provided with a plurality of through grooves which are matched with the slotted holes at the bottom of the powder guide sleeve one by one and are used for enabling powder guided by the powder discharge roller sleeve to smoothly enter the powder guide sleeve.
As further optimization, the inclination angle of the outer side faces of the slopes on the left side and the right side of the bidirectional detaching plate is 110-120 degrees.
As a further optimization, the outermost sides of the locking knife bar and the extension cutting below the side auxiliary bar are provided with guide-shaped slopes.
Compared with the prior art, the invention has the following stepsAdvantageous effects：
According to the invention, when the powder dividing mechanism is at the initial position, the powder feeding mechanism can be subjected to two-time powder output, the output powder comprises the powder paved in the forward direction and the powder paved in the reverse direction, the distances of the falling point areas of the powder before paving in the front and the back are consistent, and the falling point areas are all arranged in the paving preparation range of the scraper mechanism, so that when the scraper is contacted with the powder, namely enters a paving state, the paving state can be continuously maintained until the unidirectional powder paving is finished, the bidirectional powder paving can be maintained in the state, the powder paving stability is high, redundant lines are not generated, the scraper has a good working environment, and the appearance of a workpiece is attractive.
Drawings
Fig. 1 is a schematic structural diagram of a bidirectional powder feeding mechanism for a 3D printer according to the present invention.
Fig. 2 is a detailed schematic diagram of the powder feeding mechanism.
FIG. 3 is a detailed schematic diagram of the dam mechanism.
Fig. 4 is a schematic cross-sectional structure of a bi-directional powder feeding mechanism for a 3D printer according to the present invention.
Fig. 5 is a detailed structural schematic diagram of the doctor mechanism.
Fig. 6 is a schematic cross-sectional structure of the doctor mechanism.
Fig. 7 is a schematic view of a cross-sectional partial exploded view of the doctor mechanism.
Fig. 8 is a schematic diagram showing the detailed construction of the powder separating mechanism.
Fig. 9 is a schematic diagram showing the detailed construction of the powder separating mechanism.
Fig. 10 is a schematic diagram of a motor drive structure.
In the figure: the powder hopper-1, the powder separating mechanism-2, the motor-3, the powder feeding mechanism-4, the sleeve plate-41, the bidirectional separating guide bar-42, the material blocking mechanism-43, the bidirectional separating plate-44, the scraper mechanism-45, the locking piece-431, the guide rod-432, the spring-433, the baffle-434, the thimble-435, the locking bar-451, the blade-452, the side auxiliary bar-453, the inclined clamping bar 454, the filler rod 455, the hopper locking plate-21, the powder guiding sleeve member-22, the powder discharging roller sleeve-23, the powder conveying roller-24, the T locking piece-25, the gear-26 and the rack-31.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify 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 should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples
As shown in fig. 1 to 2:
the invention provides a bidirectional powder feeding mechanism for a 3D printer, which comprises: the powder feeding device comprises a powder hopper 1, a powder separating mechanism 2 and a powder feeding mechanism 4, wherein the bottom of the powder hopper 1 is embedded above the powder separating mechanism 2, and the powder feeding mechanism 4 is arranged right below the powder separating mechanism 2;
the powder feeding mechanism 4 comprises a sleeve plate 41 arranged right below the powder separating mechanism 2, a bidirectional separating guide bar 42 fixedly arranged at the inner middle part of the sleeve plate 41, a material blocking mechanism 43 arranged right below the bidirectional separating guide bar 42, a bidirectional separating and unloading plate 44 arranged below the material blocking mechanism 43 and a scraper mechanism 45 arranged below the bidirectional separating and unloading plate 44; the bidirectional separation guiding strip 42, the sleeve plate 41 and the material blocking mechanism 43 are surrounded to form a first storage bin and a second storage bin which are symmetrically arranged; the powder separating mechanism 2 is used for respectively throwing equal amounts of materials into the first storage bin and the second storage bin; the material blocking mechanism 43 is used for controlling the first storage bin to discharge powder when the powder feeding mechanism 4 is at an initial position, so that the powder is fed to the scraper mechanism 45 through one side of the bidirectional separating and discharging plate 44; and the material blocking mechanism 43 is used for controlling the second storage bin to discharge powder when the powder feeding mechanism 4 moves to the limit position, so that the powder is fed to the scraper mechanism 45 through the other side of the bidirectional separating and discharging plate 44.
As shown in fig. 3, the dam mechanism 43 includes: the device comprises a baffle 434, a locking block 431, a guide rod 432 and a spring 433, wherein the baffle 434 is provided with a discharge slot in a penetrating mode, the locking block 431 is fixedly arranged on the baffle 434, the guide rod 432 penetrates through the locking block 431, the spring 433 is sleeved at one end of the guide rod 432 and abuts against the locking block 431, and the thimble 435; wherein, the spring 433 is used to reset the baffle 434 when the powder feeding mechanism 4 is at the initial position, so that the discharging slot of the baffle 434 is opposite to the powder discharging of the first storage bin; the ejector pin 435 is used to push the baffle 434 to compress the spring 433 when the powder feeding mechanism 4 moves to the limit position, so that the discharging slot of the baffle 434 faces the second storage bin to discharge powder.
Wherein, the two ends of the guide rod 432 are embedded in the sleeve plate 41, which is in a fixed state, the locking block 431 and the baffle 434 are in an active state, the left side position of one sixth of the length of the guide rod is 1.5 times of the diameter of the right end, and the guide rod can just play a constraint role on the spring 433.
The locking pieces 431 are symmetrically disposed on two sides of the baffle 434, and the locking pieces 431 are accommodated in the accommodating cavity at the bottom of the sleeve plate 41, so as to reduce the volume.
As shown in fig. 5, 6 and 7, the scraper mechanism 45 includes a locking blade 451, a side auxiliary blade 453, and a blade 452 clamped between the locking blade 451 and the bottom of the side auxiliary blade 453, where the top end of the locking blade 451 is fixedly disposed below the bidirectional separating and unloading plate 44; the top of the side auxiliary bar 453 is fixedly arranged on the cutter locking bar 451.
As a further improvement, the blade 452 is clamped between the blade locking strip 451 and the side auxiliary strip 453, the blade locking strip 451 and the side auxiliary strip 453 are simultaneously penetrated by a plurality of bolts, an inclined clamping strip 454 is arranged above the blade 452, a filler rod 455 is arranged below the blade locking strip 451 and the side auxiliary strip 453, the filler rod 455 is made of rubber materials, the inclined clamping strip 454 above the blade locking strip 451 is arranged on the filler rod 455 in a transverse embedding manner, the inclined clamping strip 454 is guided by an inclined plane on the filler rod 455 in the installation process, the filler rod 455 can be adaptively deformed according to the shape of a clamping groove formed between the blade 452 and the inclined clamping strip 454 in the gradual embedding process of the inclined clamping strip 454, and after the installation is completed, the blade 452 is pressed to generate a certain inclined angle so as to extrude powder in the use process.
As shown in fig. 8 and 9, the powder separating mechanism 2 includes a hopper lock plate 21 disposed below the powder hopper 1 and penetrating through a feeding chute, a powder guiding sleeve 22 disposed under the hopper lock plate 21, a powder discharging roller sleeve 23 disposed inside the powder guiding sleeve 22, powder conveying rollers 24 disposed between the two powder discharging roller sleeves 23, T lock plates 25 disposed on two sides of the powder guiding sleeve 22, and a motor assembly 3 disposed on the side surface of the powder guiding sleeve 22 and mechanically connected with the powder conveying rollers 24, wherein the hopper lock plate 21 is used for receiving materials thrown in by the powder hopper 1, the materials fall into two empty slots above the powder discharging roller sleeve 23, two groups of strip-shaped through holes are disposed below the powder guiding sleeve 22, the motor assembly 3 drives the powder conveying rollers 24 to rotate clockwise, the strip-shaped grooves on the powder conveying rollers 24 can carry powder falling through the hopper lock plate 21, the powder falling into the right side of the powder guiding sleeve 22 after the powder conveying rollers 24 rotate, the powder falling into the right side of the powder guiding sleeve 22 and the powder guiding sleeve 24 falls into the strip-shaped grooves 4 when the powder conveying rollers 24 rotate, and the powder falling into the left side of the powder guiding sleeve 24 falls into the powder guiding sleeve 24, and the powder guiding sleeve 4 is controlled to rotate, and the powder falling into the left side of the powder guiding sleeve 24 falls into the powder guiding sleeve 4.
As a further improvement, the bottom of the powder discharging roller sleeve 23 is provided with a plurality of through grooves which are matched with the slotted holes at the bottom of the powder guiding sleeve 22 one by one, so that the powder guided by the powder discharging roller sleeve 23 smoothly enters the powder guiding sleeve 22.
Wherein, two groups of slots are arranged below the powder discharge roller sleeve 23 and the powder guiding sleeve 22, and each group of slots has different effects on guiding powder when rotating forward and backward with the motor component 3.
As a further improvement, the outer side surfaces of the slopes on the left and right sides of the two-way detaching plate 44 are inclined by 110 degrees to 120 degrees.
Experiments show that, the different slope inclination angles of the two-way separating plates 44 can cause the difference in the distance between the powder falling points, when the angle is greater than 120 °, the slope angle is too large, the powder discharge efficiency is easily affected, when the powder is discharged, the distance is too far and scattered, when the angle is less than 110 °, the powder falling distance is too near, the impact force is large when the powder falls, and the falling points are deviated towards the cutter side, so that the slope inclination angle of the two-way separating plates 44 is preferably 115 °.
As a further improvement, the outermost sides of the extension cutting below the locking blade 451 and the side auxiliary blade 453 are provided with guiding slopes.
As a further improvement, the motor assembly 3 comprises a gear 26 and a rack 31, one end of the powder conveying roller 24 is fixed with the gear 26 in a penetrating way, and the gear 26 is connected with the motor assembly 3 through the rack 31.
Specific use and action of the embodiment:
in use, the powder hopper 1 is used for placing powder, when the motor assembly 3 is not started, the interior of the powder separating mechanism 2 is in an isolated state with the powder in the powder hopper 1, and when the motor assembly 3 is started, kinetic energy can be transmitted to the powder separating mechanism 2, so that the kinetic energy is consumed through the interior, the powder in the powder hopper 1 is quantitatively transmitted, and the powder is transmitted to the powder feeding mechanism 4;
in the motor assembly 3, one end of the powder conveying roller 24 is fixedly started with the gear 26 in a penetrating manner, when the powder conveying roller 24 penetrating through the gear 26 is driven by the rack 31 to rotate clockwise, the powder conveying roller 24 is further in a clockwise rotating motion state, and through two arc-shaped grooves formed in the powder conveying roller 24, powder can be contained in the two arc-shaped grooves while contacting with the two arc-shaped grooves in the rotating process, and when the powder enters the side wall of the powder discharging roller sleeve 23 in a rotating manner, the powder contained in the two arc-shaped grooves is separated from the powder in the powder hopper 1, and when the powder passes through a notch below the right side of the powder discharging roller sleeve 23, the powder can be separated from the powder under the influence of the self weight of the powder and falls down through a slot hole below the powder discharging roller sleeve 23, and as the slot hole below the powder guiding sleeve 22 corresponds to the slot hole of the 2 powder discharging roller sleeve 3 one by one, the powder can directly pass through the slot hole at the right end of the powder guiding sleeve 22, and enter the powder feeding mechanism 4;
when the motor assembly 3 is started, the motor assembly is reversed, the powder discharge roller sleeve 23 is enabled to form a counter-clockwise rotation state through the transmission, and through the powder transmission movement, the powder finally enters the slotted hole on the left side of the powder guide sleeve 22 through the slotted hole on the left side of the powder discharge roller sleeve 23, so that the powder enters the powder feeding mechanism 4;
the powder discharge amount is controlled by the powder conveying roller 24, is in direct proportion to the rotation circle number of the powder conveying roller 24, is controlled by the starting time of the motor component 3 through the circle number of the powder conveying roller, and further needs to control the powder discharge amount and the starting time of the motor component 3;
when the powder falls down through the slot hole at the right end of the powder guiding sleeve 22, the powder enters the inclined surface at the right side of the bidirectional separating and guiding strip 42 as shown in fig. 4, and as the right side of the material blocking mechanism 43 at the bottom of the bidirectional separating and guiding strip 42 is in a normally open state, the powder can directly pass through the material blocking mechanism 43 and enter the guide of the right inclined surface of the bidirectional separating and discharging plate 44, so that the powder is output to the powder bed, and the powder output through the bidirectional separating and discharging plate 44 can be stably output to the interior of the preparation working surface of the scraper mechanism 45 under the guide of the inclined angle of 110-120 degrees;
when the powder falls through the slot hole at the left end of the guide rail 22, the powder enters the inclined surface at the left side of the bidirectional guide rail 42 as shown in fig. 4, and the left side of the stop mechanism 43 at the bottom of the bidirectional guide rail 42 is in a closed state, so that the input powder is accumulated, and when the accumulation is finished, the powder is stored above the stop mechanism 43 and in the left side space inside the sleeve plate 41 and the bidirectional guide rail 42;
when the motor assembly 3 is disconnected from the power supply and stops working, the powder feeding mechanism 4 moves towards the right side to feed, and the powder uniformly deposited on the right side preparation working surface of the scraper mechanism 45 is scraped;
when the powder feeding mechanism 4 moves to the rightmost side, as shown in fig. 4, the ejector pins 435 disposed on the rightmost side and the baffle 434 are the same as the horizontal line, the pushed baffle 434 drives the locking block 431 to move towards the left side, during the moving process, the locking block 431 presses the spring 433, the channel communicating with the right powder discharge port of the bidirectional separating and discharging plate 44 as shown in fig. 4 is gradually closed, the left powder discharge port is gradually opened, when the left powder discharge port is completely opened, the powder stored in the left space of the bidirectional separating and guiding strip 42 enters the left powder discharge port and falls into the spare working surface on the left side of the scraper mechanism 45, when the powder feeding mechanism 4 scrapes and spreads the discharged powder towards the left side, the ejector pins 435 are gradually separated from the baffle 434, and the baffle 434 is restored to the original position in the resetting process of the spring 433, so as to realize stable bidirectional powder spreading operation.
The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (7)
1. A two-way powder mechanism that send for 3D printer, characterized in that includes: the powder hopper (1), the powder separating mechanism (2) and the powder feeding mechanism (4), wherein the bottom of the powder hopper (1) is embedded above the powder separating mechanism (2), and the powder feeding mechanism (4) is arranged right below the powder separating mechanism (2);
the powder feeding mechanism (4) comprises a sleeve plate (41) arranged right below the powder separating mechanism (2), a bidirectional separating guide strip (42) fixedly arranged at the inner middle part of the sleeve plate (41), a material blocking mechanism (43) arranged right below the bidirectional separating guide strip (42), a bidirectional separating and unloading plate (44) arranged below the material blocking mechanism (43) and a scraper mechanism (45) arranged below the bidirectional separating and unloading plate (44); the bidirectional separation guide strip (42), the sleeve plate (41) and the material blocking mechanism (43) are surrounded to form two symmetrically arranged first storage bins and second storage bins; the powder separating mechanism (2) is used for respectively throwing equal amounts of materials into the first storage bin and the second storage bin; the material blocking mechanism (43) is used for controlling the first storage bin to discharge powder when the powder feeding mechanism (4) is at an initial position, so that the powder is fed to the scraper mechanism (45) through one side of the bidirectional separating and discharging plate (44); the material blocking mechanism (43) is used for controlling the second storage bin to discharge powder when the powder feeding mechanism (4) moves to the limit position, so that the powder is fed to the scraper mechanism (45) through the other side of the bidirectional separating and discharging plate (44);
the inclination angle of the outer side faces of the slopes on the left side and the right side of the bidirectional separating plate (44) is 110-120 degrees, powder falls down through the slopes, the distance is proper and falls on one side of the scraper mechanism (45), when the angle is larger than 120 degrees, the slope angle is too large, the powder discharge efficiency is easily affected, when the powder is discharged, the distance is too far and scattered, when the angle is smaller than 110 degrees, the powder falling distance is too near, the impact force is large when falling, and accordingly the falling point is offset towards the cutter side.
2. The bi-directional powder feeding mechanism for a 3D printer of claim 1, wherein: the dam mechanism (43) includes: the device comprises a baffle (434) penetrating through a discharge slot, a locking block (431) fixedly arranged on the baffle (434), a guide rod (432) penetrating through the locking block (431), a spring (433) sleeved at one end of the guide rod (432) and propped against the locking block (431), and a thimble (435); the spring (433) is used for resetting the baffle (434) when the powder feeding mechanism (4) is at an initial position, so that the discharging slot hole of the baffle (434) is opposite to the first storage bin for discharging powder; the thimble (435) is used for propping up the baffle (434) to compress the spring (433) when the powder feeding mechanism (4) moves to the limit position, so that the discharging slot hole of the baffle (434) is opposite to the second storage bin for discharging powder.
3. A bi-directional powder feeding mechanism for a 3D printer as defined in claim 2, wherein: the locking blocks (431) are symmetrically arranged on two sides of the baffle plate (434), and the locking blocks (431) are accommodated in the accommodating cavity at the bottom of the sleeve plate (41) so as to reduce the volume.
4. The bi-directional powder feeding mechanism for a 3D printer of claim 1, wherein: the scraper mechanism (45) comprises a cutter locking strip (451), a side auxiliary strip (453) and a blade (452) which is clamped between the cutter locking strip (451) and the bottom of the side auxiliary strip (453), wherein the top end of the cutter locking strip (451) is fixedly arranged below the bidirectional separating and unloading plate (44); the top of the side auxiliary strip (453) is fixedly arranged on the cutter locking strip (451).
5. The bi-directional powder feeding mechanism for a 3D printer of claim 1, wherein: the powder separating mechanism (2) comprises a hopper lock plate (21) arranged below the powder hopper (1) and penetrating through a feeding groove, a powder guiding sleeve (22) arranged right below the hopper lock plate (21), a powder discharging roller sleeve (23) arranged inside the powder guiding sleeve (22), powder conveying rollers (24) arranged between the two powder discharging roller sleeves (23) and coated with the powder, T locking plates (25) arranged on two sides of the powder guiding sleeve (22), and a motor component (3) arranged on the side face of the powder guiding sleeve (22) and mechanically connected with the powder conveying rollers (24), wherein the hopper lock plate (21) is used for receiving materials put in the powder hopper (1), the materials fall into two empty grooves above the powder discharging roller sleeves (23), two groups of strip-shaped through holes are arranged below the powder guiding sleeve (22), the motor component (3) rotates clockwise through driving the powder conveying rollers (24), the powder conveying rollers (24) carry the motor component (25) on the side face of the powder guiding sleeve (22) and rotate anticlockwise when the powder falls into the powder conveying rollers (24) through the powder guiding sleeve (24), and the powder conveying roller component (24) rotates anticlockwise, the strip-shaped groove on the powder conveying roller (24) can carry powder falling through the hopper locking plate (21), and the powder falls into the strip-shaped groove on the left side of the powder guiding sleeve member (22) after the powder conveying roller (24) rotates and is conveyed to the powder conveying mechanism (4).
6. The bi-directional powder feeding mechanism for a 3D printer of claim 1, wherein: the bottom of the powder discharge roller sleeve (23) is provided with a plurality of through grooves which are matched with the slotted holes at the bottom of the powder guide sleeve (22) one by one, and the powder discharge roller sleeve is used for smoothly leading the powder guided by the powder discharge roller sleeve (23) into the powder guide sleeve (22).
7. The bi-directional powder feeding mechanism for a 3D printer of claim 4, wherein: the outermost sides of the extension cutting below the locking cutting (451) and the side auxiliary cutting (453) are provided with guiding-shaped slopes.
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