CN107900337A - A conveying device for metal mixed powder - Google Patents

Abstract

The invention discloses a conveying device for metal mixed powder, which relates to the field of 3D printing and comprises a first hopper and a second hopper for containing metal powder, wherein the lower ends of the first hopper and the second hopper are respectively communicated with a first feeding pipe and a second feeding pipe, one end of each of the first feeding pipe and the second feeding pipe is respectively provided with a first driving system and a second driving system, the first feeding pipe and the second feeding pipe are respectively internally provided with a first piston and a second piston, the first driving system and the second driving system are respectively connected with the first piston and the second piston, the other end of each of the first feeding pipe and the second feeding pipe is respectively provided with a first discharge hole and a second discharge hole, the first discharge hole and the second discharge hole are oppositely arranged and are communicated through a powder leakage pipeline, the outlet of the powder leakage pipeline is provided with a powder leakage mechanism, a plurality of grooves sunken towards the circle center of a roller are circumferentially distributed on the periphery of the roller, the invention saves more powder and ensures the stability of the whole process.

Description

A conveying device for metal mixed powder

technical field

The invention relates to the field of 3D printing, in particular to a conveying device for metal mixed powder.

Background technique

In recent years, 3D printing has developed rapidly, and with the continuous expansion of application fields, it has attracted more and more attention from all parties. With the promulgation of various favorable policies of the country, additive manufacturing has also been favored by capital. In the foreseeable future, the field of additive manufacturing is bound to usher in explosive growth. Additive manufacturing is an advanced digital manufacturing technology, which can quickly manufacture parts with complex geometric shapes based on CAD models. Additive manufacturing technology integrates modern scientific and technological achievements such as CAD technology, numerical control technology, laser technology and material technology, and is the development direction of advanced manufacturing technology in the future.

There are many kinds of additive manufacturing technologies. In terms of metal additive manufacturing technology, selective laser melting technology (SLM: Selected Laser Melting) is a very promising additive manufacturing technology for metal parts. During the printing process, the laser beam can quickly melt Metal powder and continuous melting channel can be obtained directly, almost dense metal parts with complete metallurgical bonding and high precision can be obtained directly. Compared with other metal additive manufacturing methods such as LENS, SLS, DLF, EBM, etc., SLM has the advantages of high forming efficiency, high precision, and excellent mechanical properties. Selective laser melting technology uses laser as a heat source to perform selective laser melting on powder materials. It is a molding process in which discrete points are piled up layer by layer into a three-dimensional entity. With selective laser melting, a chamber filled with an inert atmosphere (argon or nitrogen) is heated up and kept below the melting point of the powder before processing begins. When forming, the feeding cylinder rises, and the powder spreading roller moves. First, a layer of powder material with a fixed thickness is laid on the working platform, and then the laser beam is laser processed on the powder where the solid part is located according to the cross-sectional profile under the control of the computer, so that the powder is melted and then reached. Metallurgical bonding forms a solid profile in one layer. After the first layer of sintering is completed, the workbench is lowered to the height of the set fixed layer thickness, and then a layer of powder is laid on it to carry out the next layer of sintering. The unused powder can be reused after recycling, and this cycle forms a three-dimensional prototype part. .

At present, there are two kinds of feeding devices for selective laser melting technology, one is powder feeding by material tank, and the other is feeding by rotating drum, but neither of them can achieve the practical effect of accurate feeding and saving metal powder as much as possible. , and most of the metal powders of one material are used at present. In the actual molding process in the future, metal powders of mixed materials may be involved. The current two feeding devices need to add a powder mixing and stirring device before feeding. , will occupy a huge equipment space. Therefore, a conveying device that improves the utilization rate of the powder to ensure a stable and accurate conveying process and can realize simultaneous feeding of multiple groups of powders is needed.

Contents of the invention

The object of the present invention is to provide a conveying device for mixed metal powder, so as to solve the above-mentioned multiple defects caused by the prior art.

A conveying device for mixed metal powder, comprising a first funnel and a second funnel for holding metal powder, the lower ends of the first funnel and the second funnel communicate with a first feeding pipe and a second feeding pipe respectively , one end of the first feed pipe and the second feed pipe is respectively provided with a first drive system and a second drive system, the first feed pipe and the second feed pipe are also respectively provided with a first piston and a second piston , the first drive system and the second drive system are respectively connected to the first piston and the second piston, and the other ends of the first feed pipe and the second feed pipe are respectively provided with a first discharge port and a second discharge port The material outlet, the first discharge port and the second discharge port are oppositely arranged and communicated through a powder leakage pipeline, a powder leakage mechanism is provided at the outlet of the powder leakage pipeline, and the powder leakage mechanism includes a drive motor and the The output shaft of the drive motor is connected to the roller through the rotating shaft, and the peripheral circumference of the roller is distributed with a plurality of grooves sunken toward the center of the roller.

Preferably, the axis of the rotating shaft connecting the roller to the output shaft of the drive motor is perpendicular to the axis at the outlet of the powder leakage pipeline.

Preferably, the outer diameter of the roller is larger than the inner diameter of the powder leakage pipeline, and the outlet of the powder leakage pipeline is provided with an inner groove for placing the roller.

Preferably, the sizes of the grooves are equal to each other.

Preferably, the first drive system or the second drive system is a motor that drives a lead screw nut and then drives the lead screw to drive the first piston or the second piston to reciprocate.

Preferably, the axes of the first feed pipe and the second feed pipe are parallel to the worktable, and the axes of the first discharge port and the second discharge port are respectively connected to the first feed pipe and the second feed pipe. The axes of the tubes remain inclined.

The advantage of the present invention is that: the present invention uses the motor to drive the lead screw nut and then drives the piston to reciprocate through the lead screw to realize the feeding and mixing of the metal powder, and can realize accurate and reliable feeding by precisely controlling the displacement of the piston. The feeding amount of the two metal powders can be considered to be controlled, which is convenient for proportioning. The mixed metal powder at the powder leakage pipeline can ensure the mixing of each delivery by using the orderly rotation of the roller and the grooves equal to each other in the roller structure. The amount of powder is consistent, which ensures the stability of the process.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Among them, 1-the first funnel, 2-the second funnel, 3-the first feeding pipe, 4-the second feeding pipe, 5-the first driving system, 6-the second driving system, 7-the first piston, 8-second piston, 9-first discharge port, 10-second discharge port, 11-powder leakage pipeline, 12-roller, 13-groove.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

As shown in Figure 1, a conveying device for mixed metal powder includes a first funnel 1 and a second funnel 2 for containing metal powder, and the lower ends of the first funnel 1 and the second funnel 2 are respectively communicated with a second funnel. A feed pipe 3 and a second feed pipe 4, one end of the first feed pipe 3 and the second feed pipe 4 is respectively provided with a first drive system 5 and a second drive system 6, the first feed pipe 3 The first piston 7 and the second piston 8 are also respectively arranged in the second feed pipe 4, and the first drive system 5 and the second drive system 6 are respectively connected to the first piston 7 and the second piston 8, and the first piston 7 and the second piston 8 are connected respectively. The other end of a feed pipe 3 and the second feed pipe 4 is respectively provided with a first discharge port 9 and a second discharge port 10, and the first discharge port 9 and the second discharge port 10 are oppositely arranged and Connected through the powder leakage pipeline 11, the outlet of the powder leakage pipeline 11 is provided with a powder leakage mechanism, and the powder leakage mechanism includes a driving motor and a roller 12 connected by a rotating shaft to the output shaft of the driving motor, and the circumference of the roller 12 is There are a plurality of grooves 13 sunken toward the center of the roller 12 in distribution.

In this embodiment, the axis of the rotating shaft connecting the roller 12 to the output shaft of the drive motor is perpendicular to the axis at the outlet of the powder leakage pipeline 11 .

In this embodiment, the outer diameter of the roller 12 is larger than the inner diameter of the powder leakage pipeline 11, and the outlet of the powder leakage pipeline 11 is provided with an inner groove for placing the roller 12. The upper and lower partitions at the outlet prevent the metal mixed powder from falling from the roller 12 and the outlet. The outer diameter of the roller 12 needs to be greater than the inner diameter of the powder leakage pipeline 11.

In this embodiment, the sizes of the grooves 13 are equal to each other. In order to ensure that the final delivery of mixed metal powders is equal, the grooves 13 need to be of the same design.

In this embodiment, the first drive system 5 or the second drive system 6 is a motor that drives a lead screw nut and then drives the lead screw to drive the first piston 7 or the second piston 8 to reciprocate.

In this embodiment, the axes of the first feed pipe 3 and the second feed pipe 4 are parallel to the worktable, and the axes of the first discharge port 9 and the second discharge port 10 are respectively connected to the first supply port. The axes of the feed pipe 3 and the second feed pipe 4 are kept inclined.

In the present invention, metal powders of different materials can be poured into the first funnel 1 and the second funnel 2 respectively, and under the action of gravity, the powders in the two funnels will fall in front of the first piston 7 and the second piston 8 respectively, The first piston 7 and the second piston 8 are driven to reciprocate left by the first drive system 5 and the second drive system 6. By adjusting the displacement of the pistons, the powder in the two funnels can be accurately supplied. Under the action of the piston, it will enter the first discharge port 9 and the second discharge port 10 respectively, and finally realize mixing at the powder leakage pipeline 11. When the metal mixed powder falls in the powder leakage pipeline 11, the rotating shaft is driven by the drive motor Rotate, drive the roller 12 to rotate, the metal mixed honey mill enters the groove 13 above the roller 12, and will be transported to the space below the outlet part by the rotation of the roller 12 and then leaked, during the process of the roller 12 rotating Among them, the metal mixed powder above the roller 12 in the outlet is isolated by the roller 12, and only the metal mixed powder in the groove 13 can rotate with the roller 12 and enter the space below.

Based on the above, the present invention adopts the motor to drive the lead screw nut and then drives the piston to reciprocate through the lead screw to realize the feeding and mixing of metal powder. By precisely controlling the displacement of the piston, accurate and reliable feeding can be realized. At the same time, the two kinds of metal The amount of powder feeding can be controlled, which is convenient for proportioning. The metal powder mixed at the powder leakage pipeline 11 can ensure the mixed powder delivered each time by using the orderly rotation of the roller 12 and the grooves 13 equal to each other in the roller structure. The quantity is consistent, ensuring the stability of the process.

It can be known from common technical knowledge that the present invention can be realized through other embodiments without departing from its spirit or essential features. Accordingly, the above-disclosed embodiments are, in all respects, illustrative and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are embraced by the present invention.

Claims (6)

1. a kind of conveying device of metal mixed powder, it is characterised in that including the first funnel (1) for holding metal dust With the second funnel (2), the lower end of first funnel (1) and the second funnel (2) has been respectively communicated with the first feeder sleeve (3) and second Feeder sleeve (4), first feeder sleeve (3) and the second feeder sleeve (4) one end are respectively equipped with the first drive system (5) and second and drive System (6) is moved, first piston (7) and second piston (8), institute are further respectively had in the first feeder sleeve (3) and the second feeder sleeve (4) State the first drive system (5) and the second drive system (6) connects the first piston (7) and second piston (8) respectively, first supplies The other end of expects pipe (3) and the second feeder sleeve (4) is respectively equipped with the first discharge port (9) and the second discharge port (10), and described first Discharge port (9) is oppositely arranged with the second discharge port (10) and is connected by leaking powder pipeline (11), and leakage powder pipeline (11) goes out Extruding machine structure is equipped with mouthful, the extruding machine structure includes the rolling that driving motor is connected with the driving motor output shaft by shaft Take turns (12), the concave groove of multiple way rollers (12) circle centre position (13) is distributed with roller (12) circumferential periphery.

A kind of 2. conveying device of metal mixed powder according to claim 1, it is characterised in that：The roller (12) with The axis and the axis perpendicular in the exit of leakage powder pipeline (11) of the shaft of driving motor output shaft connection.

A kind of 3. conveying device of metal mixed powder according to claim 1, it is characterised in that：The roller (12) Outside diameter is more than the internal diameter of leakage powder pipeline (11), and the exit of the leakage powder pipeline (11) is equipped with the inside groove for placing roller (12).

A kind of 4. conveying device of metal mixed powder according to claim 1, it is characterised in that：The groove (13) Size is equal to each other.

A kind of 5. conveying device of metal mixed powder according to claim 1, it is characterised in that：First drivetrain System (5) or the second drive system (6) drive feed screw nut for motor and then drive leading screw to drive first piston (7) or second Piston (8) is reciprocating.

A kind of 6. conveying device of metal mixed powder according to claim 1, it is characterised in that：First feeder sleeve (3) and the second feeder sleeve (4) axis it is parallel with work top, the axis of first discharge port (9) and the second discharge port (10) Line keeps being obliquely installed with the axis of the first feeder sleeve (3) and the second feeder sleeve (4) respectively.