Powder recycling system

Patent metadata

Field	Value
Publication number	US-9586365-B2
Application number	US-201514684753-A
Country	US
Kind code	B2
Filing date	Apr 13, 2015
Priority date	Apr 22, 2014
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A powder recycling system includes a powder feeder, a remaining powder collector, a bridge breaker, a block powder filter, a cyclone separator, a particulate filter cleaner, an air pressure generation device and an electrostatic precipitator. The powder feeder provides a construction powder to a construction platform. The remaining powder collector for collects the remaining powder. The cyclone separator is used to separate the large-size powdery particles and the small-size powdery particles of the remaining powder from each other through a rotating gaseous stream. The large-size powdery particles fall down to the powder feeder due to gravity, and the small-size powdery particles of the remaining powder is removed from the rotating gaseous stream and transmitted to the particulate filter cleaner. After the small-size powdery particles of the remaining powder are filtered by the particulate filter cleaner, the suspended small-size powdery particles are transmitted to the electrostatic precipitator.

First claim

What is claimed is:

1. A powder recycling system for recycling remaining powder from a construction chamber of a three-dimensional object forming apparatus, the powder recycling system comprising:
a powder feeder comprising a powder container for accommodating a construction powder, wherein the powder feeder comprises a first inlet, a second inlet and a powder exhaust port, wherein the construction powder falls down to the construction chamber through the powder exhaust port, so that a constructing process is performed within the construction chamber;
a remaining powder collector comprising a guiding tank, wherein the guiding tank surrounds the construction chamber for collecting the remaining powder from the construction chamber, wherein a bottom of the guiding tank has a collector outlet;
a cyclone separator comprising a first cyclone unit and a second cyclone unit, wherein the first cyclone unit comprises a first cyclone inlet, a first cyclone outlet and a first powder falling port, and the second cyclone unit comprises a second cyclone inlet, a second cyclone outlet and a second powder falling port, wherein the first cyclone inlet is in communication with the collector outlet of the remaining powder collector through a first duct, the first cyclone outlet is in communication with the second cyclone inlet through a second duct, the first powder falling port is in communication with the first inlet of the powder feeder, and the second powder falling port is in communication with the second inlet of the powder feeder, wherein the remaining powder from the remaining powder collector is separated into large-size powdery particles and small-size powdery particles by the cyclone separator, the large-size powdery particles fall down to the powder feeder to be recycled as the construction powder, and the small-size powdery particles are outputted from the second cyclone outlet;
a particulate filter cleaner comprising a powder collecting tank, a covering member, a filter net, a cleaner inlet and an airflow channel, wherein the filter net is arranged between the covering member and the powder collecting tank, an upper portion of the powder collecting tank has an airflow conducting space, and the cleaner inlet is in communication with the second cyclone outlet of the cyclone separator through a third duct, wherein when a negative pressure airflow is introduced into the airflow channel, the small-size powdery particles of the remaining powder are transmitted from the second cyclone unit to the airflow conducting space through the cleaner inlet and filtered by the filter net, so that portions of the small-size powdery particles are suspended;
an air pressure generation device providing the negative pressure airflow, and comprising a first airflow port and a second airflow port, wherein the first airflow port is in communication with the airflow channel of the particulate filter cleaner through a fourth duct; and
an electrostatic precipitator comprising a connecting port and a dust collection plate, wherein the connecting port is in communication with the second airflow port of the air pressure generation device through a fifth duct, wherein the suspended small-size powdery particles from the particulate filter cleaner are introduced into the electrostatic precipitator through the connecting port and adsorbed by electrostatic charges on the dust collection plate.

2. The powder recycling system according to claim 1 , wherein the powder recycling system further comprises a bridge breaker, and the bridge breaker comprises a breaker inlet and a breaker outlet, wherein the breaker inlet is in communication with the collector outlet of the remaining powder collector, and the breaker outlet is in communication with the first duct, wherein a bridge effect of the remaining powder from the collector outlet is eliminated by the bridge breaker, so that the remaining powder is smoothly transferred to the cyclone separator through the breaker outlet and the first duct.

3. The powder recycling system according to claim 2 , wherein the bridge breaker further comprises a rotating lever, and the rotating lever is disposed within the bridge breaker, wherein upon rotation of the rotating lever, the remaining powder within the bridge breaker is loosened so as to be smoothly outputted from the breaker outlet.

4. The powder recycling system according to claim 2 , wherein the bridge breaker further comprises a vibrator, and the vibrator is disposed within the bridge breaker, wherein upon vibration of the vibrator, the remaining powder within the bridge breaker is loosened so as to be smoothly outputted from the breaker outlet.

5. The powder recycling system according to claim 1 , wherein the particulate filter cleaner comprises:
a cleaner outlet located at a bottom of the powder collecting tank, wherein the cleaner outlet is in communication with the first duct through a bypass duct;
a check valve located at a junction between the cleaner inlet and the airflow conducting space, wherein the check valve is selectively opened or closed according to a pressure difference between the cleaner inlet and the airflow conducting space;
a door plate assembly disposed within the powder collecting tank, wherein if the door plate assembly is in a close state, the airflow conducting space is not in communication with the cleaner outlet, wherein if the door plate assembly is in an open state, the airflow conducting space is in communication with the cleaner outlet; and
an airflow exhaust valve located at a top of the covering member and comprising a filtering medium, wherein the airflow exhaust valve and the airflow channel are in communication with an airflow conducting gap of the covering member, and the suspended small-size powdery particles of the remaining powder are filtered by the filtering medium and not leaked out of the airflow exhaust valve, wherein an elastic suppressor is located at a top of the airflow exhaust valve,
wherein when the negative pressure airflow is introduced into the airflow channel, the check valve is opened, the elastic suppressor is closed, and the door plate assembly is in the close state, so that the airflow conducting space is in not communication with the cleaner outlet and the small-size powdery particles of the remaining powder are transmitted from the second cyclone unit to the airflow conducting space through the cleaner inlet and filtered by the filter net.

6. The powder recycling system according to claim 5 , wherein when the air pressure generation device provides a positive pressure airflow and the positive pressure airflow is introduced into the airflow channel, the check valve is closed, the elastic suppressor is opened, and the door plate assembly is in the open state, so that the cleaner inlet is not in communication with the airflow conducting space but the airflow conducting space is in communication with the cleaner outlet, wherein when the positive pressure airflow blows the filter net, the small-size powdery particles of the remaining powder adsorbed by the filter net fall down to the cleaner outlet so as to be transmitted to the first duct through the bypass duct.

7. The powder recycling system according to claim 1 , wherein the powder feeder further comprises a weight sensor or a motor torque sensor for sensing a weight of the construction powder in the powder container, wherein if the weight of the construction powder in the powder container reaches a threshold value, the remaining powder is not recycled to the powder container.

8. The powder recycling system according to claim 1 , wherein the first duct comprises an upper section, a connector and a lower section, wherein the upper section is detachably connected with the lower section through the connector, whe

Assignees

• Microjet Technology Co Ltd

Inventors

• Chen Chang-Chih
• Chen Chih-Kai
• Shi Kwo-Yuan
• Huang Chi-Feng

Classifications

• B07B9/02

  Combinations of similar or different apparatus for separating solids from solids using gas currents · CPC title

• B29C64/393

  for controlling or regulating additive manufacturing processes · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B07B9/00

  Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets · CPC title

• B07B4/00

  Separating solids from solids by subjecting their mixture to gas currents (using tables or jigs B03B4/00) · CPC title