TWI628070B - Powder supply device of dusting apparatus - Google Patents

Abstract

A powder supplying device of a dusting machine comprises a fixing seat, a powder storage unit, a powder supply unit and a driving unit, wherein the powder supply unit has at least one stirring rod and a spreading roller, by stirring rod and paving The design of the powder roller enables the powder to be agitated and squeezed, thereby making the powder finer and more uniform.

Description

Powder feeding device for powder spreading machine

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a powder supplying device, and more particularly to a powder supplying device for a dusting machine applied in 3D printing.

The main technical content of 3D rapid prototyping (also known as 3D printing) is to put the data and raw materials into the 3D printing machine, and print the products layer by layer through the powder spreading device to form the final product. It mainly includes Selective Laser Sintering (SLS), Selective Laser Melting (SLM), Direct Metal Laser Sintering (DMLS), and electron beam melting ( Flectron Beam Melting, EBM) and other technologies. SLS uses low-power laser to sinter low-melting polymer powder materials; SLM uses high-energy beam laser to directly melt metal powder; DMLS uses laser to sinter binary metal; EBM uses electron beam to melt metal powder.

However, the existing paving device generally adopts a powder rolling roller or a scraping plate. Although the existing paving device can also realize the function of powder feeding and laying powder, the powdering roller or the scraping plate can easily lay the powder material loosely. That is, the gap between the powder particles and the particles is large, and the powder is released unevenly, resulting in poor compactness of the 3D molded product produced by the loose powder, which ultimately affects the mechanical properties of the 3D molded product.

Therefore, it is necessary to provide an improved powder supplying device for a dusting machine to solve the problems of the conventional technology.

The main object of the present invention is to provide a powder supplying device for a dusting machine, which utilizes the design of a stirring rod and a powdering roller to enable the powder to be agitated and squeezed, thereby making the powder finer and avoiding agglomeration.

In order to achieve the above object, the present invention provides a powder supply device for a powder spreading machine, the powder supply device of the powder coating machine comprising a fixing seat, a powder storage unit, a powder supply unit and a driving unit; a barrel body and a discharge port, the barrel body is disposed on the fixing base for storing a powder, and the discharge port is formed at a lower edge of the barrel body for outputting the powder material; the powder supply unit Having at least one stirring rod and a spreading roller, the stirring rod is pivotally connected to the fixing seat and located below the discharge opening, the spreading roller is pivotally connected to the fixing seat and located below the stirring rod; The driving unit has a motor and a linkage assembly, and the motor drives the linkage assembly to drive the stirring rod and the spreading roller to rotate.

In an embodiment of the invention, the powder supply unit further has a scraper disposed on the fixing seat and located below the spreading roller.

In an embodiment of the invention, the stirring rod has a screw and an external thread portion formed on an outer circumferential surface of the screw.

In an embodiment of the invention, the powder spreading roller has a rod body and a plurality of receiving grooves, and the recesses of the material receiving grooves are formed on an outer circumferential surface of the rod body.

In an embodiment of the invention, a width of a section of the barrel is tapered toward the discharge opening.

In an embodiment of the invention, the linkage assembly has a ratchet disposed on the mounting base for driving the spreading roller to rotate.

In an embodiment of the invention, the linkage assembly has a speed reduction mechanism for driving the stirring rod and the powder roller to rotate, and the number of rotations of the powder roller is less than the number of rotations of the stirring rod.

In an embodiment of the invention, the powder supply unit has two stirring rods, and a gap is formed between the two stirring rods, and the powdering roller is located below the gap.

In an embodiment of the present invention, the linkage assembly has a plurality of runners and at least one belt, and the runners are respectively mounted on the stirring rod, the powder roller and the motor, and the belt sleeve is disposed at the rotation On the wheel.

In an embodiment of the invention, the motor is a stepper motor or a servo motor.

As described above, the powder supplying device of the present invention enables the powder of the barrel to be agitated and squeezed first by the design of the stirring rod and the powdering roller, and the powder is uniformly accumulated by the powdering roller. The laying of the powder not only makes the powdered powder more detailed, but also avoids agglomeration of the powder.

100‧‧‧Food supply device

101‧‧‧Workbox

2‧‧‧ Fixed seat

3‧‧‧Storage unit

31‧‧‧ barrel

32‧‧‧Outlet

4‧‧‧Powder unit

41‧‧‧ stir bar

411‧‧‧ screw

412‧‧‧External thread

42‧‧‧Powder Roller

421‧‧‧ rod body

422‧‧‧Content trough

43‧‧‧Scraper

5‧‧‧ drive unit

51‧‧‧Motor

52‧‧‧ linkage components

521‧‧‧runner

522‧‧‧Land

523‧‧‧Speed reduction mechanism

1 is a schematic view showing a preferred embodiment of a powder supplying device of a powder spreading machine according to the present invention; and FIG. 2 is a perspective view of a preferred embodiment of a powder supplying device of a dusting machine according to the present invention; 3 is an exploded view of a preferred embodiment of a powder supplying device of a duster according to the present invention; and FIG. 4 is a perspective view of another preferred embodiment of the powder supplying device of the powder spreading machine according to the present invention; Fig. 5 is a perspective view showing another preferred embodiment of the powder supplying device of the powder spreading machine according to the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; Furthermore, the directional terms mentioned in the present invention, such as upper, lower, top, bottom, front, rear, left, right, inner, outer, side, surrounding, central, horizontal, horizontal, vertical, longitudinal, axial, Radial, uppermost or lowermost, etc., only refer to the direction of the additional schema. Therefore, the directional terminology used is for the purpose of illustration and understanding of the invention.

Referring to Figures 1 to 3, in a preferred embodiment of the powder supplying device of the powder spreading machine of the present invention, a powder supplying device 100 is installed in a working box 101 of a powder spreading machine, the powder supplying device 100 The invention comprises a fixing base 2, a powder storage unit 3, a powder supply unit 4 and a driving unit 5. The detailed structure, assembly relationship and operation principle of each component will be described in detail below.

Referring to FIGS. 2 to 3, the fixing base 2 is a hollow housing seat for mounting in the working box 101, and an operator is provided to move left and right as indicated by the arrow in FIG. The operation of spreading the powder in the work box 101 can be achieved.

Continuing with reference to Figures 2 to 3, the powder storage unit 3 has a barrel 31 and a discharge port 32. The barrel 31 is disposed on the holder 2 for storing a powder. 32 is formed at a lower edge of the barrel 31 for outputting the powder. In the present embodiment, a section width of the barrel 31 is tapered toward the discharge opening 32 to form a taper.

With reference to the second to third figures, the powder supply unit 4 has two stirring bars 41, a spreading roller 42 and a scraper 43; wherein each stirring bar 41 is pivotally connected to the fixing base 2 and located at the same a discharge port 32 of the powder storage unit 3, and a gap is formed between the two stirring bars 41; the powder roller 42 The fixing roller 2 is pivotally connected to the fixing seat 2, and the powder discharging roller 42 is located directly below the gap; the scraper 43 is disposed on the fixing base 2 and located below the spreading roller 42. In the present embodiment, each of the stirring rods 41 has a screw 411 and an external thread portion 412. The external thread portion 412 is convexly formed on an outer circumferential surface of the screw 411, and the powder roller 42 has a rod body. The 421 and the plurality of receiving slots 422 are formed on the outer peripheral surface of the rod body 421 by the recesses of the plurality of receiving slots 422.

With reference to the second to third embodiments, the driving unit 5 has a motor 51 and a linkage assembly 52 for driving the linkage assembly 52 to drive the stirring rods 41 of the powder supply unit 4 and the The spreading roller 42 rotates. In this embodiment, the motor 51 can be a stepping motor or a servo motor, and the linkage assembly 52 has a plurality of rotating wheels 521 and a plurality of belts 522 respectively mounted on the powder supplying unit 4 The stirring rod 41, the spreading roller 42 and the motor 51 are attached to the rotating wheel 521 at the same time. In addition, the linkage assembly 52 further has a speed reduction mechanism 523 for driving the stirring rods 41 and the powder spreading roller 42 to rotate, and the number of rotations of the powder roller 42 is smaller than the number of rotations of the stirring rod 41. The stirring rods 41 are used to agitate the powder and distribute the powder evenly. The powder spreading roller 42 receives the quantitative powder through the volume tank 422, thereby controlling the feeding of the powder. the amount.

According to the above structure, the powder contained in the barrel 31 is output from the discharge port 32, and the powder passes through the stirring rods 41 first, so that the external thread portion 412 of the stirring rods 41 is applied to the powder. The material is agitated and extruded to make the powder finer and avoid agglomeration of the powder, thereby evenly distributing the powder; then the powder will fall onto the spreading roller 42 and accumulate in the volume tank 422. When the rod 421 rotates downward, the material storage tank 422 can control the amount of the powder to be laid down quantitatively, thereby completing the dusting operation. It should be noted that, by the design of the speed reduction mechanism 523, the number of rotations when the powder roller 42 is rotated is smaller than the number of rotations when the stirring rod 41 is rotated. It is possible to prevent the powder of the tub 31 from accumulating when it is dropped to form a concavo-convex shape, so that the powder supplying device 100 can achieve a more uniform spreading effect.

With the above design, the powder supply device 100 of the present invention enables the powder of the barrel 31 to be firstly stirred and squeezed by the design of the stirring rod 41 and the powder discharging roller 42 to pass through the powder discharging roller 42. After the powder is accumulated, the uniform laying can not only make the powdered powder more fine, but also avoid the agglomeration of the powder. In addition, the rotation speed of the stirring rod 41 and the powder spreading roller 42 are different, and the stirring rods 41 agitate the powder to make the powder uniform, and the powder discharging roller 42 receives the quantitative powder through the material storage tanks 422. The material can effectively control the supply amount of the powder, so that the powder supply device 100 can achieve a better powder spreading effect.

Referring to FIG. 2, another preferred embodiment of the powder supplying device of the present invention is generally followed by the same component name and figure number, but the difference between the two is characterized in that the interlocking component 52 has a plurality of a rotating wheel 521 and a belt 522 respectively mounted on the stirring rod 41, the powder discharging roller 42 and the motor 51 of the powder supplying unit 4, and the rotating wheel for driving the powder discharging roller 42 therein The 521 is a ratchet wheel and is disposed on the fixing base 2. Therefore, when the motor 51 rotates, the belt 522 is driven to drive the stirring rods 41 to rotate, and the belt 522 also drives the powder discharging roller 42 to rotate, that is, the powder discharging roller 42 and the stirring rods 41. The number of turns is the same.

As described above, the powder supplying apparatus 100 of the present invention agitates the powder by the stirring rods 41 to make the powder uniform, and at the same time, the quantitative powder is accommodated through the receiving tank 422 of the powder discharging roller 42, and the powder can be effectively controlled. The amount of the powder is such that the powder of the barrel 31 can be uniformly agitated and squeezed by the stirring rods 41, and then the powdering roller 42 accumulates the powder and is laid, which can not only lay the powder. The powder is finer and more uniform, and it can also avoid powder agglomeration. Further, the powder supplying apparatus 100 of the present invention can also achieve a design for reducing the volume of the speed reducing mechanism, thus providing another embodiment.

The present invention has been disclosed in its preferred embodiments, and is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

Claims (9)

A powder supplying device of a dusting machine comprises: a fixing seat; a powder storage unit having: a barrel body disposed on the fixing seat for storing a powder; and an discharging port formed in the barrel a lower edge of the body for outputting the powder; a powder supply unit having: at least one stirring rod pivotally connected to the fixing seat and located below the discharge opening; and a powdering roller pivotally connected thereto a driving base and located below the stirring rod; and a driving unit having a motor and a linkage assembly, the motor driving the linkage assembly to drive the stirring rod and the spreading roller to rotate, wherein the linkage assembly has a speed reducing mechanism The rotating rod and the spreading roller are driven to rotate, and the number of rotations of the spreading roller is less than the number of rotations of the stirring rod. The powder supplying device of the dusting machine according to the first aspect of the invention, wherein the powder supplying unit further has a scraper disposed on the fixing seat and located below the spreading roller. The powder supplying device of the dusting machine according to the first aspect of the invention, wherein the stirring rod has a screw and an external thread portion formed on an outer circumferential surface of the screw. The powder supplying device of the dusting machine according to the first aspect of the invention, wherein the powdering roller has a rod body and a plurality of material receiving grooves, and the recesses of the material collecting grooves are formed in one of the rod bodies On the outer peripheral surface. The powder supplying device of the dusting machine according to the first aspect of the invention, wherein a width of a section of the barrel is tapered toward the discharge opening. The powder supplying device of the dusting machine according to the first aspect of the invention, wherein the linking assembly has a ratchet disposed on the fixing seat for driving the spreading roller to rotate. The powder supplying device of the dusting machine according to claim 1, wherein the powder supplying unit has two stirring bars, and a gap is formed between the two stirring bars, and the powder discharging roller is located below the gap. The powder supplying device of the dusting machine according to claim 1, wherein the linking assembly has a plurality of rotating wheels and at least one belt, and the rotating wheels are respectively mounted on the stirring rod, the spreading roller and the motor And the belt sleeve is disposed on the runners. The powder supplying device of the dusting machine according to claim 1, wherein the motor is a stepping motor or a servo motor.