CN111702163A

CN111702163A - 3D prints metal powder shale shaker

Info

Publication number: CN111702163A
Application number: CN202010475391.8A
Authority: CN
Inventors: 严鹏飞; 李崇宇; 严彪
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-09-25
Anticipated expiration: 2040-05-29
Also published as: CN111702163B

Abstract

The invention relates to a 3D printing metal powder vibrating screen which sequentially comprises a vibrating base (1), a screening assembly (2) and a feeder (3) from bottom to top, wherein the screening assembly (2) comprises a screening cylinder (201) and a plurality of layers of screen meshes (202) arranged in the screening cylinder (201), the top of the screening cylinder (201) is communicated with the feeder (3), and the bottom of the screening cylinder (201) is arranged on the vibrating base (1) and is provided with a plurality of partition plates (205) and discharge pipes (203) which are distributed along the radial direction. Compared with the prior art, the invention realizes the dual functions of particle size screening and fluidity screening, avoids the deviation or throwing away of the screening cylinder in the vibration process, prolongs the service life, can replace the screen mesh according to the requirements aiming at the metal powder of different materials, can be put into use after being replaced, is convenient and quick, and can effectively prevent the loss of the metal powder.

Description

3D prints metal powder shale shaker

Technical Field

The invention relates to the field of screening devices, in particular to a 3D printing metal powder vibrating screen.

Background

3D printing is a rapid prototyping technology, also known as additive manufacturing technology, and is a technology for constructing an object by using a bondable material such as powdered metal or plastic and the like and printing layer by layer on the basis of a digital model file, and is usually realized by adopting a digital technology material printer.

Selective laser melting (Selective laser melting) is one of additive manufacturing technologies, belongs to a rapid metal powder forming technology, and can directly form metal parts with complete compactness and good mechanical properties. The selective laser melting technology is a rapid forming technology appearing in the end of the 20 th century and the 80 s, and utilizes a laser beam to melt a powder material to perform layered processing and manufacturing technology, and specifically comprises the following steps: the three-dimensional description of the part is converted into a whole set of slices, each slice describes two cross sections with determined height, laser beams are adopted to conduct layered scanning on the powdery forming material, the powder irradiated by the laser beams is melted, after one layer is scanned and melted, the workbench descends by the thickness of one layer, the powder spreading roller spreads a layer of uniform and compact powder on the powder spreading roller until the whole moulding is completed, the powder spreading of each layer is only different from several micrometers to dozens of micrometers, and therefore high requirements are provided for the size and consistency of powder particles, and otherwise the quality of the melted forming part and the feasibility of process implementation are affected.

Among the materials that have been successfully used in selective laser melting processes are paraffin, polymer, metal, ceramic powder and composite materials thereof, wherein the metal material is more particularly, and the remaining metal powder particles generate metal spheroidization products after each melting and splash together with the residues. At this time, large particle wastes in the residual powder after melting must be removed by screening with a vibratory screening apparatus so that the residual powder can be recycled. But the vibration screening equipment in the existing market is not only complicated in structure, but also single in function, low in screening quality and incapable of screening the fluidity of metal powder, so that great raw material waste is caused. Therefore, how to sieve out metal powder with proper fluidity becomes a problem to be solved urgently.

The current vibrating screening devices include the following:

(1) the single-layer vibrating screen has the same function as a common screen, and can only distinguish the particle size of the metal powder.

(2) The multi-layer vibrating screen can distinguish different grades of metal powder according to particle size, for example, the patent with the application number of CN 201910553883.1.

(3) A vibrating screen with crushing means, such as that disclosed in patent application No. CN 201920079955.9.

Wherein, the single-layer vibrating screen can only distinguish the particle size of the metal powder, and the function is too single; although the multilayer vibrating screen can distinguish metal powder with different levels of particle sizes, in the field of 3D printing, the particle size is not the only index for measuring the performance of the metal powder, and the problem needs to be further improved; the vibrating screen with the crushing device can avoid waste of agglomerated powder, but also fails to effectively screen out 3D printing metal powder with different properties.

Disclosure of Invention

The invention aims to solve the problems and provide a 3D printing metal powder vibrating screen which realizes double functions of particle size screening and fluidity screening, avoids a screening cylinder from deviating or being thrown away in the vibrating process, prolongs the service life, can be used for metal powder of different materials, is convenient and quick, can be replaced according to requirements, can be put into use after being replaced, and can effectively prevent the loss of the metal powder.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a 3D prints metal powder shale shaker, the shale shaker includes vibration frame, screening subassembly and charging means from bottom to top in proper order, the screening subassembly includes a screening section of thick bamboo and locates the multilayer screen cloth in the screening section of thick bamboo, the top and the charging means of screening section of thick bamboo are linked together, the bottom of screening section of thick bamboo is arranged in on the vibration frame to be equipped with a plurality of partitions and discharging pipes along radial distribution, a plurality of partitions set up with one heart, and the entry of discharging pipe is located between the adjacent partition.

Preferably, the vibration frame includes the board of placing that is used for placing the screening section of thick bamboo, it is equipped with the discharging pipe through-hole that supplies the discharging pipe to pass through to place on the board.

Preferably, the screening cylinder is formed by stacking a plurality of detachable screening cylinder bodies on the screening cylinder bottom up and down. Or stacked by adopting sieves.

Preferably, the shale shaker is still established the locating rack outside screening section of thick bamboo including the cover, the locating rack includes clamp plate, a plurality of screw thread pole setting and a plurality of gland nut, the top of screening section of thick bamboo is located to the clamp plate to be equipped with the pole setting through-hole that a plurality of confession screw thread pole settings run through, it is equipped with a plurality of screw thread recesses with screw thread pole setting matched with on the board to place, the one end of screw thread pole setting is passed the pole setting through-hole and with screw thread recess threaded connection, the other end salient in the clamp plate and with gland nut threaded connection.

Preferably, the outer diameter of the placing plate is larger than that of the sieving cylinder, and the outer diameter of the pressing plate is larger than that of the placing plate.

Preferably, each screening cylinder is provided with a placing groove on the inner wall, and the screen is positioned on the placing groove.

Preferably, the placing plate is provided with a positioning groove, and the bottom of the screening cylinder is connected with the positioning groove in a buckling mode.

Preferably, the vibration machine base further comprises a machine base shell, a vibration motor and a supporting block, wherein the vibration motor and the supporting block are arranged in the machine base shell, an eccentric wheel is arranged on an output shaft of the vibration motor, the eccentric wheel is in transmission connection with the supporting block, a supporting block through hole for the supporting block to extend out is formed in the top of the machine base shell, and the supporting block is connected with the bottom of the placing plate. Vibrating motor drives the eccentric wheel and rotates, can produce fixed frequency's vibration, makes a screening section of thick bamboo produce through the supporting shoe and sways, and then sieves, and the different metal powder of mobility falls into the annular region of difference in screening section of thick bamboo bottom behind the screen cloth to realize the screening purpose.

Preferably, the cross section of the supporting block is square, the cross section of the supporting block through hole is square, the length of the square supporting block is 0.5-0.8 times of the length of the square supporting block through hole, the width of the square supporting block is 0.5-0.8 times of the width of the square supporting block through hole, and the supporting block cannot touch the base shell when vibrating, so that the supporting block can conveniently vibrate and rotate and avoid collision.

Preferably, the charging means is an electric charging means, the top of the electric charging means is provided with a charging hopper and a charging motor, a chamber is formed inside the charging hopper, a screw rod connected with the charging motor in a transmission manner is axially arranged, the outlet of the bottom of the charging hopper is provided with a charging pipe, the charging hopper is communicated with the chamber, and the charging pipe is communicated with the screening cylinder. (please supplement the advantages of the spiral feeder: the advantage is that the feeding speed is linearly adjustable, and can be completely matched with the screening device within a certain range)

Preferably, the feeding pipe is sleeved with a screen cover, and the pressing plate is provided with a screen cover through hole for the screen cover to extend into. The screen cover can effectively prevent the loss of metal powder.

3D prints during metal powder enters into the screening section of thick bamboo through the filling tube earlier, vibrates through the bobbing machine seat, makes metal powder can evenly distributed on the screen cloth, and the screening of particle diameter is carried out through the screen cloth to the back, evenly falls on the screening section of thick bamboo bottom, and the rethread vibration has different mobility respectively to gather in the annular region of difference based on the metal powder of different particle diameters, flows through the discharging pipe at last. In the screening process, the whole vibrating screen keeps vibrating, the upper multi-layer screen only plays a role in screening particle sizes, only the lowest layer of screen and the bottom of the screening barrel with the annular partition plates play a role in screening powder flowability together, in the vibrating process, powder with good flowability can fall from the center of the lowest layer of screen, powder with poor flowability can fall from the edge of the lowest layer of screen, at the moment, a plurality of annular partition plates are arranged below the screens, every two adjacent partition plates form a collecting area (only the middle is a circular area, and the rest are annular areas), the powder collected in the collecting area is different in flowability, the flowability of the metal powder falling in the circular area in the center is optimal, and the flowability of the metal powder falling in the annular area at the edge is the lowest.

Compared with the prior art, the invention has the following advantages:

(1) this shale shaker divides the screening section of thick bamboo into a plurality of concentric collection regions according to mobility, and every collection region corresponds a discharging pipe, and the metal powder of different particle diameters has different mobility, can automatic gathering in screening section of thick bamboo bottom, later collects respectively through the discharging pipe, has realized the dual function of particle diameter screening and mobility screening.

(2) According to the requirement of particle size screening, set up the screening section of thick bamboo of the different number of piles and form the screening section of thick bamboo of co-altitude not, the cooperation locking screening section of thick bamboo of clamp plate, gland nut and nut pole setting on the locating rack is passed through to the back, avoids the offset of screening section of thick bamboo in vibration process or is thrown away increase of service life.

(3) To the metal powder of different materials, the screen cloth can be changed as required, has changed and can have put into use, convenient and fast.

(4) The vibrating screen is simple in structure, the screen cover is hermetically connected with the feeding pipe, and loss of metal powder is effectively prevented.

Drawings

FIG. 1 is a schematic structural diagram of a 3D printed metal powder vibrating screen;

FIG. 2 is a schematic view of the annular region of the bottom of the screening cartridge;

FIG. 3 is a schematic view of a front perspective structure of the sieving cartridge;

FIG. 4 is a schematic view of the structure of the junction of adjacent screening cylinders;

FIG. 5 is a schematic top view of the placement board;

FIG. 6 is a schematic top view of the platen;

FIG. 7 is a schematic top view of a sieving drum with a plurality of vertically staggered placement slots;

FIG. 8 is a schematic top view of a sieving drum with multiple slots aligned above and below;

FIG. 9 is a schematic top view of the sieving cylinder of the whole placing groove;

FIG. 10 is a front perspective structural view of the vibration housing;

FIG. 11 is a side perspective structural view of the vibration housing;

fig. 12 is a schematic view of the front perspective structure of the feeder.

In the figure: 1-a vibration machine base; 101-placing a plate; 102-a discharge tube through hole; 103-a support block; 104-a housing of a stand; 105-a vibration motor; 106-an output shaft; 107-eccentric wheel; 108-a threaded groove; 109-positioning grooves; 110-support block through hole; 2-a screen assembly; 201-screening cylinder; 202-screen mesh; 203-a discharge pipe; 204-placing a groove; 205-a separator; 3-a feeder; 301-a loading hopper; 302-a charge motor; 303-chamber; 304-a screw; 305-a feed tube; 306-a screen cover; 4-a positioning frame; 401-a platen; 402-a threaded upright rod; 403-a compression nut; 404-upright rod through holes; 405-screen cover through hole.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

As shown in FIG. 1, a 3D printing metal powder vibrating screen comprises a vibrating base 1, a screening assembly 2 and a feeder 3 from bottom to top, the screening assembly 2 comprises a screening cylinder 201 and a plurality of layers of screen meshes 202 arranged in the screening cylinder 201, the top of the screening cylinder 201 is communicated with the feeder 3, the bottom of the screening cylinder 201 is arranged on the vibrating base 1 and is provided with a plurality of partition plates 205 and discharge pipes 203 which are distributed along the radial direction, the plurality of partition plates 205 are concentrically arranged, the inlets of the discharge pipes 203 are arranged between the adjacent partition plates 205, specifically, as shown in FIG. 2, the number of the partition plates 205 and the number of the discharge pipes 203 can be set according to the requirement of the division range of the fluidity, that is, a plurality of screening cylinders 201 can be prepared, each screening cylinder is provided with different numbers of partition plates 205 and discharge pipes 203, or the inner wall of the bottom of the screening cylinder 201 is provided with a plurality of annular grooves or clamping grooves for changing the number of, in this case, it is necessary to provide several discharge pipes 203 in order to prevent the metal powder in a certain region from flowing out of the discharge pipes 203.

As shown in fig. 3, 4, and 7-9, the sieving cylinder 201 is formed by stacking a plurality of detachable sieving cylinder bodies on the bottom of the sieving cylinder body, a placing groove 204 is provided on the inner wall of each sieving cylinder body, the sieving net 202 is located on the placing groove 204, the placing groove 204 may be a plurality of separately arranged long grooves with a certain central angle, when different sieving cylinder bodies are stacked, the placing grooves 204 may be stacked in a staggered manner, as shown in fig. 7, or stacked in parallel, as shown in fig. 8, the placing groove 204 may also be a whole circular groove arranged along the circumference of the sieving cylinder body, as shown in fig. 9 (the partition plate 205 is omitted in fig. 1-9). Figure 4 is a schematic view of the configuration of the junction of adjacent screening cylinders with a raised ring groove at the top and a recessed ring groove at the bottom of the screening cylinders, the recessed ring groove resting on the raised ring groove when one screening cylinder is stacked on another. As shown in fig. 5, the placing plate 101 is provided with a plurality of positioning grooves 109, the plurality of positioning grooves 109 form a circle, and the outer diameter of the bottom of the screening cartridge is smaller than or equal to the inner diameter of the circle formed by the positioning grooves 109, so that the bottom of the screening cartridge is in snap-fit connection with the positioning grooves 109.

As shown in fig. 1, 5, and 6, the sieving barrel 201 is further sleeved with a positioning frame 4, the positioning frame 4 includes a pressing plate 401, a plurality of threaded vertical rods 402 and a plurality of gland nuts 403, the pressing plate 401 is disposed on the top of the sieving barrel 201 and is provided with a plurality of vertical rod through holes 404 for the threaded vertical rods 402 to pass through, the placing plate 101 is provided with a plurality of threaded grooves 108 matching with the threaded vertical rods 402, one end of the threaded vertical rods 402 passes through the vertical rod through holes 404 and is in threaded connection with the threaded grooves 108, and the other end protrudes out of the pressing plate 401 and is in threaded connection with the gland nuts 403. The outer diameter of the placing plate 101 is larger than that of the sieving cylinder 201, and the outer diameter of the pressing plate 401 is larger than that of the placing plate 101.

As shown in fig. 10 and 11, the vibration housing 1 includes a housing 104, a vibration motor 105 and a supporting block 103, the vibration motor 105 and the supporting block 103 are disposed in the housing 104, an eccentric 107 is disposed on an output shaft 106 of the vibration motor 105, the eccentric 107 is connected to the supporting block 103 in a driving manner, a supporting block through hole 110 for the supporting block 103 to protrude is disposed on a top of the housing 104, a placing plate 101 for placing a sieving cylinder 201 is disposed on the supporting block 103 and connected to a bottom of the placing plate 101, and a discharging pipe through hole 102 for a discharging pipe 203 to pass through is disposed on the placing plate 101. The cross section of the supporting block 103 is square, the cross section of the supporting block through hole 110 is square, the length of the square supporting block is 0.5-0.8 times of the length of the square supporting block through hole, and the width of the square supporting block is 0.5-0.8 times of the width of the square supporting block through hole (the size of the supporting block through hole 110 is larger than that of the supporting block 103, so that the supporting block 103 can rotate under the transmission of the eccentric wheel 107).

As shown in fig. 12, the feeder 3 is an electric feeder 3, a hopper 301 and a feeding motor 302 are disposed on the top of the electric feeder 3, a chamber 303 is formed inside, a screw 304 in transmission connection with the feeding motor 302 is axially disposed, a feeding pipe 305 is disposed at the outlet of the bottom, the hopper 301 is communicated with the chamber 303, and the feeding pipe 305 is communicated with the classifying cylinder 201. The feed pipe 305 is externally sleeved with a screen cover 306, and a screen cover through hole 405 for the screen cover 306 to extend into is arranged on the pressing plate 401.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The utility model provides a 3D prints metal powder shale shaker, a serial communication port, the shale shaker includes vibration frame (1), screening subassembly (2) and charging means (3) from bottom to top in proper order, screening subassembly (2) are including screening section of thick bamboo (201) and locate multilayer screen cloth (202) in screening section of thick bamboo (201), the top and the charging means (3) of screening section of thick bamboo (201) are linked together, the bottom of screening section of thick bamboo (201) is arranged in on vibration frame (1) to be equipped with a plurality of baffle (205) and discharging pipe (203) along radial distribution.

2. The 3D printing metal powder vibrating screen is characterized in that the vibrating base (1) comprises a placing plate (101) for placing a screening cylinder (201), and a discharging pipe through hole (102) for a discharging pipe (203) to pass through is formed in the placing plate (101).

3. The 3D printed metal powder vibrating screen of claim 2, wherein the screening cylinder (201) is formed by stacking a plurality of detachable screening cylinders on top of each other on the bottom of the screening cylinder.

4. The 3D printing metal powder vibrating screen is characterized in that the vibrating screen further comprises a positioning frame (4) sleeved outside the screening cylinder (201), the positioning frame (4) comprises a pressing plate (401), a plurality of threaded vertical rods (402) and a plurality of compression nuts (403), the pressing plate (401) is arranged at the top of the screening cylinder (201) and is provided with a plurality of vertical rod through holes (404) for the threaded vertical rods (402) to penetrate through, a plurality of threaded grooves (108) matched with the threaded vertical rods (402) are formed in the placing plate (101), one end of each threaded vertical rod (402) penetrates through the corresponding vertical rod through hole (404) and is in threaded connection with the corresponding threaded groove (108), and the other end of each threaded vertical rod protrudes out of the pressing plate (401) and is in threaded connection with the corresponding compression nut (403).

5. The 3D printing metal powder vibrating screen according to claim 4, characterized in that the outer diameter of the placing plate (101) is larger than the outer diameter of the sieving cylinder (201), and the outer diameter of the pressing plate (401) is larger than the outer diameter of the placing plate (101).

6. The 3D printed metal powder vibratory screen of claim 3, wherein each screening cylinder has a placement groove (204) on an inner wall, the screen mesh (202) being positioned on the placement groove (204).

7. The 3D printing metal powder vibrating screen as claimed in claim 3, wherein a plurality of positioning grooves (109) are formed in the placing plate (101), and the bottom of the screening cylinder bottom is in snap-fit connection with the positioning grooves (109).

8. The 3D printing metal powder vibrating screen as claimed in claim 2, wherein the vibrating base (1) further comprises a base shell (104), a vibrating motor (105) and a supporting block (103) which are arranged in the base shell (104), an eccentric wheel (107) is arranged on an output shaft (106) of the vibrating motor (105), the eccentric wheel (107) is in transmission connection with the supporting block (103), a supporting block through hole (110) for the supporting block (103) to extend out is formed in the top of the base shell (104), and the supporting block (103) is connected with the bottom of the placing plate (101).

9. The 3D printing metal powder vibrating screen is characterized in that a feeding hopper (301) and a feeding motor (302) are arranged at the top of the feeder (3), a chamber (303) is formed inside the feeder, a screw (304) in transmission connection with the feeding motor (302) is axially arranged on the feeder, a feeding pipe (305) is arranged at an outlet at the bottom of the feeder, the feeding hopper (301) is communicated with the chamber (303), and the feeding pipe (305) is communicated with the sieving cylinder (201).

10. The 3D printing metal powder vibrating screen as claimed in claim 9, wherein a screen cover (306) is sleeved outside the feeding pipe (305), and a screen cover through hole (405) for the screen cover (306) to extend into is formed in the pressing plate (401).