Powder recycling system of selective laser sintering printing equipment

Abstract

The utility model discloses a powder recycling system of selective laser sintering printing equipment. The powder recycling system is characterized in that printing powder mixed with workpieces in a movable material box can be conveyed into a glove box for powder cleaning by a conveying mechanism; powdery materials in the glove box for powder cleaning can be conveyed to the old powder storage bin by negative pressure; powdery materials in the old powder storage bin are sieved by the old powder rotary vibration sieve and then are conveyed into the mixing machine by negative pressure; new printing powder fed through the new powder feeding box can be conveyed to the mixing machine by negative pressure; materials discharged by the mixing machine are sieved by the mixture rotary vibration sieve and then are stored in the mixture storage bin; blocky materials in the movable material box can enter the smashing bin to be smashed, and an outlet of the smashing bin is communicated with the old powder vacuum feeding machine. The system is high in powder cleaning efficiency, and the utilization rate of printing powder mixed with workpieces can be increased; the new printing powder is mixed with the screen underflow of the old powder rotary vibration screen and then screened again, and the mixture can be directly stored or conveyed to a powder supply device of the printing equipment.

Description

Technical Field

[0001] The utility model relates to the field of part printing equipment, and more specifically to a powder recycling system for a selective laser sintering printing equipment. Background Art

[0002] The selective laser sintering forming technology utilizes the thermal effect of laser and, according to the slice information of the part, sinter and stack solid powder materials layer by layer to finally form a part prototype or a functional part. The powder materials that are not scanned by the laser during the part forming process will not be sintered at high temperature, and can play a supporting role for the cavities and cantilever structures of the part. These powders are in a loose state and can be reused, and it has a high material utilization rate.

[0003] When the part is printed and cooled, the worker will remove the forming cylinder or forming carriage containing the printing powder mixed with the workpiece from the printing equipment. Subsequently, the part and the powder are manually separated, and the separated powder is collected and transported to a secondary processing equipment for screening and then used as old powder for standby; while the separated part will be transported to a downstream station for manual secondary cleaning to thoroughly clean the powder remaining inside the cavity or cantilever structure of the part.

[0004] The existing technology usually docks the forming carriage to the cleaning workbench through a positioning mechanism. After the forming cavity is ejected, the printing powder mixed with the workpiece is directly manually pushed into a vibrating screen for separating the part and the powder. After the separated part is transported out, the powder remaining inside the part is manually cleaned again with compressed air. The screened powder separated out enters an old powder bucket for collection and standby. The above-mentioned collected old powder and the new powder in the new powder bucket are put into a powder mixing bucket according to a certain ratio, and after mixing for a certain time, it is used for the second time as a finished product.

[0005] The printing powder mixed with the workpiece is heavy, which requires high physical strength of the worker. At the same time, due to a large amount of powder and parts directly pressing on the vibrating screen surface, the vibrating screen has a large load and the screening efficiency is very low, which is not suitable for continuous operation;

[0006] Most of the existing technologies are to screen the part and the powder through a vibrating screen for the printing powder mixed with the workpiece, and then transport the part to other stations for manual cleaning of the powder remaining inside the complex part. The powder falling during the transportation process will cause environmental pollution. At the same time, the powder after multiple external transports may be contaminated and cannot be reused, reducing the utilization rate of raw materials;

[0007] In the prior art, when dealing with the recycled powder, most of the time, the appropriate powder passing through the sieve is obtained through vibration screening, while there is no indication of how to handle the powder remaining on the sieve. Usually, it is collected as waste and scrapped; unless the powder is directly scrapped due to thermal runaway, most of these powders remaining on the sieve are powder aggregates adhered together by electrostatic adsorption or high temperature. If properly processed, powders that can be reused can be obtained, improving the powder recycling rate;

[0008] The commonly used process in the prior art is powder cleaning + screening + mixing of new and old powders. In fact, due to the diversity of materials, it is uncertain whether the mixed powder meets the direct use standard. If secondary agglomeration occurs during the powder mixing process and it is directly fed into the printing equipment for use, it will affect the printing process and product quality;

[0009] In the prior art, the positive pressure conveying method is often used during the material transfer process. Since positive pressure conveying has high requirements for the tightness of pipelines and equipment, there is a certain risk of powder leakage. At the same time, it requires a large amount of compressed air and has a high equipment maintenance cost.

[0010] Therefore, how to provide a powder recycling system for a selective laser sintering printing device to overcome the above problems is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0011] In view of this, the present utility model provides a powder recycling system for a selective laser sintering printing device.

[0012] To achieve the above object, the present utility model adopts the following technical solutions:

[0013] A powder recycling system for a selective laser sintering printing device, comprising: a mobile material box, a frame, and a glove box for powder cleaning, an old powder vacuum feeder, an old powder storage bin, an old powder rotary vibrating screen, an old powder batching vacuum feeder, a new powder feeding box, a new powder batching vacuum feeder, a mixer, a mixture rotary vibrating screen, a mixture storage bin, and a crushing bin, all of which are installed on the frame; the upper end of the mobile material box is open and its interior can hold printing powder mixed with workpieces, a conveying mechanism is installed on the mobile material box, and the conveying mechanism can convey the printing powder mixed with workpieces into the glove box for powder cleaning; a first discharge port and a second discharge port are provided at the lower end of the glove box for powder cleaning, a mesh plate is covered at the first discharge port, and a suction pipe is arranged inside the glove box for powder cleaning; the feeding end of the old powder vacuum feeder is respectively connected to the first discharge port and the suction pipe; the feeding end and the discharging end of the old powder storage bin are respectively communicated with the discharging end of the old powder vacuum feeder and the feeding end of the old powder rotary vibrating screen; the feeding end of the old powder batching vacuum feeder is connected to the discharge port of the undersize material of the old powder rotary vibrating screen; the new powder feeding box is provided with a new powder feeding port and a new powder discharge port, and the new powder discharge port is communicated with the feeding end of the new powder batching vacuum feeder; the feeding ports of the mixer are respectively communicated with the discharging end of the old powder batching vacuum feeder and the discharging end of the new powder batching vacuum feeder; the feeding end of the mixture rotary vibrating screen is connected to the discharging end of the mixer; the feeding end of the mixture storage bin is communicated with the discharge port of the undersize material of the mixture rotary vibrating screen; a crushing blade is arranged inside the crushing bin, a driving motor is installed on the crushing bin, the crushing blade is fixed to the output rotating shaft of the driving motor, an inlet and an outlet are provided on the crushing bin, the second discharge port, the discharge port of the oversize material of the old powder rotary vibrating screen, and the discharge port of the oversize material of the mixture rotary vibrating screen are all communicated with the inlet, and the outlet is connected to the feeding end of the old powder vacuum feeder.

[0014] It can be seen from the above technical solution that compared with the prior art, the utility model discloses a powder recycling system for laser selective sintering printing equipment. The conveying mechanism in the utility model can reliably convey the printing powder mixed with workpieces into the powder cleaning glove box; after the printing powder mixed with workpieces enters the powder cleaning glove box, the powdered material in the powder cleaning glove box can be conveyed to the old powder storage bin by the negative pressure of the old powder vacuum loader through the drop port 1 and the suction pipe; and the block material in the powder cleaning glove box can be transferred to the crushing bin through the drop port 2 and crushed by the high-speed rotating crushing blade. After the block material is crushed into powder material in the crushing bin, it can be conveyed to the old powder storage bin by the negative pressure of the old powder vacuum loader; this design can improve the powder cleaning efficiency on the one hand, and improve the utilization of the printing powder mixed with workpieces on the other hand. utilization rate; the new printing powder put into the new powder feeding box can enter the mixer and be fully mixed with the screened material of the old powder rotary vibrating screen; the mixed material in the mixer will be screened again by the mixture rotary vibrating screen, and the screened material of the mixture rotary vibrating screen can be stored in the mixture storage bin or transported to the powder supply device of the printing equipment; on the one hand, the above design can ensure that the screened material of the old powder rotary vibrating screen is fully mixed with the new printing powder, and on the other hand, before being stored or transported to the powder supply device of the printing equipment, since the mixture of the screened material of the old powder rotary vibrating screen and the new printing powder can be screened again, it is ensured that the above mixture will not undergo secondary agglomeration; the block material, the screened material of the old powder rotary vibrating screen and the screened material of the mixture rotary vibrating screen can enter the crushing bin for crushing, and the printing powder mixed with the workpiece can be effectively and fully recycled.

[0015] Preferably, the machine further comprises a vertical lifting mechanism, which is mounted on the frame, the vertical lifting end of which can be connected to the mobile material box, the open end of which can be sealed against the bottom of the powder cleaning glove box, and the bottom of the powder cleaning glove box is also provided with a feed port, which can communicate with the interior of the mobile material box, and the printing powder mixed with the workpiece can pass through the feed port and enter the powder cleaning glove box. The vertical lifting mechanism can lift the mobile material box in place upward, ensuring that the open end of the mobile material box can communicate with the feed port and that powder does not leak at the connection between the two.

[0016] Preferably, a support frame is provided at the lower end of the mobile bin, and universal wheels are fixed at the lower end of the support frame; the vertical lifting mechanism includes a guide rail, a slider, a telescopic cylinder, a bracket, a contact member, a proximity switch 1, and a controller 1. The guide rail is vertically fixed on the frame, the slider is slidably mounted on the guide rail, the bracket is fixed to the slider, the telescopic cylinder is vertically arranged and its fixed end is connected to the frame, the telescopic end of the telescopic cylinder is connected to the bracket, two contact members are provided and both are fixed to the bracket, the support frame can be moved between the two brackets, two lifting members are provided on the support frame, and the two contact members can respectively contact the two lifting members; the proximity switch 1 and the controller 1 are both mounted on the frame, the proximity switch 1 and the telescopic cylinder are both electrically connected to the controller 1, the detection end of the proximity switch 1 can be aligned with the support frame, and when the support frame triggers the proximity switch 1, the opening end of the mobile bin is directly opposite to the position of the feed inlet. The mobile bin can move flexibly; when the telescopic cylinder extends, it can drive the mobile bin to rise reliably; the mobile bin can be accurately arranged in place, and the opening end of the mobile bin can be directly opposite to the position of the feed inlet.

[0017] Preferably, it further includes a weighing sensor 1, a weighing sensor 2, and a weighing sensor 3. One connection end of the weighing sensor 1 is fixed to the frame, and the other connection end of the weighing sensor 1 is fixed to the old powder storage bin; one connection end of the weighing sensor 2 is fixed to the frame, and the other connection end of the weighing sensor 2 is fixed to the mixer; one connection end of the weighing sensor 3 is fixed to the frame, and the other connection end of the weighing sensor 3 is fixed to the mixed material storage bin; the weighing sensor 1, the weighing sensor 2, and the weighing sensor 3 are all electrically connected to the controller 1. The changes in the in-and-out weights of the materials in the old powder storage bin, the mixer, and the mixed material storage bin can be monitored in real time, which is convenient for later quality ratio of the powdery materials and the new printing powder.

[0018] Preferably, the conveying mechanism includes a load-carrying tray, a reduction motor, a driving synchronous pulley, a nut, a driven synchronous pulley, a synchronous belt, a lead screw, a connecting member, a guide rod, a proximity switch II, a baffle, and a controller II. The load-carrying tray is vertically slidably arranged in the mobile material box, the tray surface of the load-carrying tray is horizontally arranged, and the printing powder mixed with workpieces can be placed on the load-carrying tray; the reduction motor is vertically fixed on the support frame, the driving synchronous pulley is coaxially fixed on the output rotating shaft of the reduction motor, the lower end of the mobile material box is provided with an opening and vertically rotatably supports the nut, the driven synchronous pulley is located outside the mobile material box, the driven synchronous pulley is coaxially fixed with the nut, and the synchronous belt is sleeved on both the driving synchronous pulley and the driven synchronous pulley at the same time; the nut is screwed on the lead screw, the upper end of the lead screw is connected with the load-carrying tray, and the lower end of the lead screw is fixed to the connecting member, and the connecting member is located outside the mobile material box; a plurality of guide rods are vertically arranged and evenly arranged along the circumferential direction of the driven synchronous pulley, a plurality of sliding holes are provided at the bottom of the mobile material box, the upper ends of the plurality of guide rods are fixed to the load-carrying tray after passing through the plurality of sliding holes respectively, and the lower ends of the plurality of guide rods are all fixed to the connecting member; the proximity switch II is fixed to the inner bottom of the mobile material box, the baffle is fixed to the lower tray surface of the load-carrying tray, one side plate surface of the baffle can be aligned with the detection end of the proximity switch II, the controller II is fixed on the support frame, and both the reduction motor and the proximity switch II are electrically connected to the controller II. The load-carrying tray can rise and fall reliably, and the printing powder mixed with workpieces on the load-carrying tray can smoothly enter the glove box for powder cleaning.

[0019] Preferably, it further includes a positive suction and reverse blowing mechanism, a collecting hopper, and a jetting mechanism. The positive suction and reverse blowing mechanism includes an installation box, a cylindrical filter element, a negative pressure vacuum pump I, a blowing pipe, an air tank, and a valve body. The installation box is arranged inside the glove box for flour cleaning. The cylindrical filter element is arranged vertically. There are multiple cylindrical filter elements, and they are all located inside the glove box for flour cleaning. The air outlet ends of the multiple cylindrical filter elements are fixedly connected and communicated with the installation box. The negative pressure vacuum pump I is fixed on the frame, and the air inlet end of the negative pressure vacuum pump I is communicated with the inside of the installation box. The blowing pipe is fixed inside the installation box, and blowing holes are opened on the pipe wall of the blowing pipe. The blowing holes are communicated with the air outlet ends of the cylindrical filter elements. The air tank is fixed on the glove box for flour cleaning. The air outlet end of the air tank is communicated with one end of the blowing pipe, and the valve body is connected in series between them. The air inlet end of the air tank can be connected to an external high-pressure air source. The collecting hopper is located below the glove box for flour cleaning. The large opening end of the collecting hopper is fixedly connected to the bottom of the glove box for flour cleaning. A discharge port is opened at the bottom of the glove box for flour cleaning. The discharge port corresponds to and is communicated with the large opening end of the collecting hopper. The multiple cylindrical filter elements are all located above the discharge port. The small opening end of the collecting hopper is communicated with the old powder vacuum feeding machine. The first material falling port is communicated with the inside of the collecting hopper through a pipeline. The new powder feeding box is communicated with the glove box for flour cleaning through a pipeline. The jetting mechanism includes a blowing gun and a spring air pipe. The blowing gun is arranged inside the glove box for flour cleaning. One end of the spring air pipe is communicated with the air inlet end of the blowing gun, and the other end of the spring air pipe is communicated with an external high-pressure air source. Workers use the blowing gun to jet the workpieces inside the glove box for flour cleaning. The powdered materials lifted can be intercepted and adsorbed by the cylindrical filter elements. The blowing pipe can blow air in the reverse direction to the cylindrical filter elements, and the powdered materials attached to the outer wall of the cylindrical filter elements can fall into the collecting hopper, which is convenient to be sucked away by the old powder vacuum feeding machine. The blowing gun and the negative pressure vacuum pump I work simultaneously, and the air pressure inside the glove box for flour cleaning can be maintained in balance to prevent the glove box for flour cleaning from leaking powder.

[0020] Preferably, a partition is vertically fixed inside the glove box for flour cleaning. Multiple through holes are evenly arranged on the partition. The partition divides the inside of the glove box for flour cleaning into a first cavity and a second cavity. The first material falling port, the second material falling port, the suction pipe, and the blowing gun are all located in the first cavity. The installation box and the discharge port are all located in the second cavity. The bulk materials in the glove box for flour cleaning will not fall into the collecting hopper.

[0021] Preferably, both the new powder batching vacuum loader and the old powder batching vacuum loader are located above the mixer, the mixture rotary vibrating screen is arranged below the mixer, and the mixture storage bin is arranged below the mixture rotary vibrating screen; above the pulverizing bin, there are arranged the glove box for purifying powder, the mixture rotary vibrating screen and the old powder rotary vibrating screen. This design facilitates the downward transportation of powdery materials or lumpy materials by their own gravity. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0023] Figure 1 is an overall axonometric view of a powder recycling system of a selective laser sintering printing device Figure 1 ;

[0024] Figure 2 is an overall axonometric view of a powder recycling system of a selective laser sintering printing device Figure 2 ;

[0025] Figure 3 is a front view of a powder recycling system of a selective laser sintering printing device;

[0026] Figure 4 is a schematic diagram of a powder recycling system of a selective laser sintering printing device;

[0027] Figure 5 is a partial axonometric view of a powder recycling system of a selective laser sintering printing device Figure 1 ;

[0028] Figure 6 is a partial axonometric view of a powder recycling system of a selective laser sintering printing device Figure 2 ;

[0029] Figure 7 is a partial axonometric view of a powder recycling system of a selective laser sintering printing device Figure 3 ;

[0030] Figure 8 is a partial axonometric view of a powder recycling system of a selective laser sintering printing device Figure 4 ;

[0031] Figure 9 is a partial axonometric view of a powder recycling system of a selective laser sintering printing deviceFigure 5 ;

[0032] Figure 10 is a partial axonometric view of a powder recycling system of a selective laser sintering printing device Figure 6 ;

[0033] Figure 11 is an axonometric view of a mobile material box, a support frame and a conveying mechanism in a powder recycling system of a selective laser sintering printing device;

[0034] Figure 12 is an axonometric sectional schematic view of a mobile material box, a support frame and a conveying mechanism in a powder recycling system of a selective laser sintering printing device;

[0035] Figure 13 is a process flow chart of a powder recycling system of a selective laser sintering printing device.

[0036] In the figure:

[0037] 01 is a mobile material box, 02 is a frame, 03 is a glove box for powder cleaning, 030 is a first blanking port, 031 is a second blanking port, 032 is a feeding port, 033 is a discharging port, 04 is an old powder vacuum loader, 05 is an old powder storage bin, 06 is an old powder rotary vibrating screen, 07 is an old powder batching vacuum loader, 08 is a new powder feeding box, 080 is a new powder feeding port, 081 is a new powder discharging port, 09 is a new powder batching vacuum loader, 10 is a mixer, 11 is a mixture rotary vibrating screen, 12 is a mixture storage bin, 13 is a crushing bin, 130 is an inlet, 131 is an outlet, 14 is a carrier tray, 15 is a reduction motor, 16 is a driving synchronous pulley, 17 is a nut, 18 is a driven synchronous pulley, 19 is a synchronous belt, 20 is a lead screw, 21 is a connecting piece, 22 is a guide rod, 23 is a proximity switch two, 24 is a baffle, 25 is a controller two, 26 is a perforated plate, 27 is a suction pipe, 28 is a crushing blade, 29 is a driving motor, 30 is a guide rail, 31 is a slider, 32 is a bracket, 33 is a telescopic cylinder, 34 is an abutting piece, 35 is a proximity switch one, 36 is a controller one, 37 is a support frame, 370 is a lifting piece, 38 is a universal wheel, 39 is a weighing sensor one, 40 is a weighing sensor two, 41 is a weighing sensor three, 42 is an installation box, 43 is a cylindrical filter element, 44 is a negative pressure vacuum pump one, 45 is a blowing pipe, 46 is an air tank, 47 is a valve body, 48 is an aggregate hopper, 49 is a blowing gun, 50 is a spring air pipe, 51 is a partition plate, 510 is a through hole, 52 is a slag discharge pipe, 53 is a negative pressure vacuum pump two. Specific embodiments

[0038] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] The utility model discloses a powder recycling system for laser selective sintering printing equipment. The conveying mechanism in the utility model can reliably convey the printing powder mixed with the workpiece into the glove box 03 for powder cleaning;

[0040] After the printing powder mixed with workpieces enters the powder cleaning glove box 03, the powdered material in the powder cleaning glove box 03 can be negatively pressure-transferred by the used powder vacuum feeder 04 to the used powder storage bin 05 through the first drop-out port 030 and the suction pipe 27. Meanwhile, the bulk material in the powder cleaning glove box 03 can be transferred to the crushing bin 13 through the second drop-out port 031 and crushed by the high-speed rotating crushing blades 28. After the bulk material is crushed into powder in the crushing bin 13, it can be negatively pressure-transferred by the used powder vacuum feeder 04 to the used powder storage bin 05. This design can improve the powder cleaning efficiency and the utilization rate of the printing powder mixed with workpieces.

[0041] The powdered material in the old powder storage bin 05 can enter the old powder rotary vibrating screen 06 for screening, and the screened material of the old powder rotary vibrating screen 06 can be negatively pressure-transported to the mixer 10 by the old powder batching vacuum loader 07; the present application is also designed with a new powder feeding box 08, and the new printing powder put in the new powder feeding box 08 can enter the mixer 10 and be fully mixed with the screened material of the old powder rotary vibrating screen 06; the mixed material in the mixer 10 will be screened again by the mixture rotary vibrating screen 11, and the screened material of the mixture rotary vibrating screen 11 can be stored in the mixture storage bin 12 or transported to the powder supply device of the printing equipment; on the one hand, the above design can ensure that the screened material of the old powder rotary vibrating screen 06 is fully mixed with the new printing powder, and on the other hand, before being stored or transported to the powder supply device of the printing equipment, since the mixture of the screened material of the old powder rotary vibrating screen 06 and the new printing powder can be screened again, it is ensured that the above mixture will not re-agglomerate;

[0042] The bulk material, the oversize material of the old powder vibrating screen 06 and the oversize material of the mixed material vibrating screen 11 can enter the crushing bin 13 for crushing, and the printing powder mixed with the workpiece can be effectively and fully recycled;

[0043] By designing a positive suction and reverse blowing mechanism and a jetting mechanism, workers can use a blowing gun 49 to jet and clean the workpieces in the glove box 03 for powder cleaning. The powdered materials lifted will be sucked and intercepted by the cartridge filter 43. This design can improve the cleaning efficiency and quality of the printing powder mixed with workpieces on the one hand. On the other hand, the blowing gun 49 blows air into the glove box 03 for powder cleaning, while the negative pressure vacuum pump 44 extracts the gas in the glove box 03 for powder cleaning. The simultaneous operation of the two can maintain the air pressure balance in the glove box 03 for powder cleaning and prevent dust leakage due to excessive pressure in the glove box 03 for powder cleaning;

[0044] The powdered materials attached to the outer surface of the cartridge filter 43 due to interception can fall off by reverse blowing through the blow pipe 45 to the cartridge filter 43. The powdered materials detached from the cartridge filter 43 can enter the aggregate hopper 48, which is convenient to be sucked away by the old powder vacuum feeder 04;

[0045] In this application, the powdered materials are transported in a negative pressure manner, which has low requirements for the sealing performance of pipelines and equipment and reduces the maintenance cost of the system;

[0046] After the printing powder mixed with workpieces is cleaned by jetting and suction methods and the powdered materials are collected, the above-mentioned powdered materials will go through screening, mixing with new printing powder, and screening of the mixture. The finally obtained material can be directly transported to the powder supply device of the printing equipment; as for the lumps in the printing powder mixed with workpieces, they will repeatedly go through the screening of the old powder rotary vibrating screen 06, the screening of the mixture rotary vibrating screen 11, and the crushing in the crushing bin 13. The lumps can be fully crushed. As for the lumps that still cannot be crushed after multiple cycles, they can be sucked away by an external vacuum cleaner;

[0047] The printing powder mixed with workpieces can be processed in a closed manner in this system, and the printing powder mixed with workpieces will not be contaminated due to contact with the outside world during the processing.

[0048] Embodiment

[0049] See the attached Figure 1-13 It is a schematic diagram of the overall and partial structures of an embodiment of the present utility model. The present utility model specifically discloses a powder recycling system for a selective laser sintering printing device, which cleans, collects, mixes and reuses the printing powder mixed with workpieces; the printing powder mixed with workpieces includes powdered materials and lumps;

[0050] The system includes a mobile bin 01, a frame 02, a glove box 03 for flour cleaning, an old powder vacuum feeder 04, an old powder storage bin 05, an old powder rotary vibrating screen 06, an old powder batching vacuum feeder 07, a new powder feeding box 08, a new powder batching vacuum feeder 09, a mixer 10, a mixture rotary vibrating screen 11, a mixture storage bin 12, and a crushing bin 13; among them, the glove box 03 for flour cleaning, the old powder vacuum feeder 04, the old powder storage bin 05, the old powder rotary vibrating screen 06, the old powder batching vacuum feeder 07, the new powder feeding box 08, the new powder batching vacuum feeder 09, the mixer 10, the mixture rotary vibrating screen 11, the mixture storage bin 12, and the crushing bin 13 are all installed on the frame 02;

[0051] The mobile bin 01 is a rectangular box with an open upper end. The inside of the mobile bin 01 can hold printing powder mixed with workpieces; a conveying mechanism is installed on the mobile bin 01, and the conveying mechanism can convey the printing powder mixed with workpieces into the glove box 03 for flour cleaning, so as to facilitate workers to process the printing powder mixed with workpieces;

[0052] A first discharge port 030 and a second discharge port 031 are provided at the lower end of the glove box 03 for flour cleaning. A perforated plate 26 is covered at the first discharge port 030; the hand of a worker can reach into the glove box 03 for flour cleaning, and rub the bulk material on the perforated plate 26. The bulk material will be completely broken into powder or partially broken into powder due to the above rubbing. The above powder will pass through the perforated plate 26 and enter the first discharge port 030, and the bulk material that cannot be rubbed into powder by hand will be moved into the second discharge port 031;

[0053] A suction pipe 27 is provided inside the glove box 03 for flour cleaning. The feeding end of the old powder vacuum feeder 04 is connected to the first discharge port 030 and the suction pipe 27 through pipelines, and a first butterfly valve is connected in series between the feeding end of the old powder vacuum feeder 04 and the suction pipe 27; the powder in the glove box 03 for flour cleaning will be sucked away by the old powder vacuum feeder 04 through the suction pipe 27 or the first discharge port 030;

[0054] The discharging end of the old powder vacuum feeder 04 is connected to the feeding end of the old powder storage bin 05 through a pipeline, and a second butterfly valve is connected in series between the two. The powder from the glove box for flour cleaning will be negatively pressure conveyed to the old powder storage bin 05 by the old powder vacuum feeder 04;

[0055] The discharging end of the old powder storage bin 05 is connected to the feeding end of the old powder rotary vibrating screen 06 through a pipeline, and a third butterfly valve is connected in series between the two. The old powder rotary vibrating screen 06 will screen the powder from the old powder storage bin 05;

[0056] The discharge port of the undersize material of the old powder rotary vibrating screen 06 is connected to the first connection end of a first three-way pipe. The second connection end of the first three-way pipe is connected to the feeding end of the old powder batching vacuum feeding machine 07 through a pipeline, and a butterfly valve four is connected in series between the two. The third connection end of the first three-way pipe is connected to the old powder storage container outside the frame 02 through a pipeline, and a butterfly valve five is connected in series between the two. When the old powder storage bin 05 is full, the butterfly valve four is closed and the butterfly valve five is opened. The undersize material of the old powder rotary vibrating screen 06 will enter the old powder storage container outside the frame 02 for temporary storage. Conversely, when the amount of powdered material in the old powder storage bin 05 is insufficient, the powdered material in the old powder storage container will be sucked away by the old powder batching vacuum feeding machine 07. The feeding end of the old powder batching vacuum feeding machine 07 can be connected to the discharge port of the undersize material of the old powder rotary vibrating screen 06, so that the undersize material of the old powder rotary vibrating screen 06 can be sucked away by the old powder batching vacuum feeding machine 07;

[0057] The new powder feeding box 08 is provided with a new powder feeding port 080 and a new powder discharge port 081. The new powder discharge port 081 is communicated with the feeding end of the new powder batching vacuum feeding machine 09. Workers can add new printing powder to the new powder feeding box 08, and the printing powder in the new powder feeding box 08 will be sucked away by the new powder batching vacuum feeding machine 09;

[0058] The feeding ports of the mixer 10 are respectively communicated with the discharge end of the old powder batching vacuum feeding machine 07 and the discharge end of the new powder batching vacuum feeding machine 09 through pipelines. A butterfly valve six is connected in series between the feeding port of the mixer 10 and the discharge end of the old powder batching vacuum feeding machine 07. A butterfly valve seven is connected in series between the feeding port of the mixer 10 and the discharge end of the new powder batching vacuum feeding machine 09. The powdered material in the old powder storage bin 05 will be negatively pressure conveyed to the mixer 10 by the old powder batching vacuum feeding machine 07, and the new printing powder in the new powder feeding box 08 will be negatively pressure conveyed to the mixer 10 by the new powder batching vacuum feeding machine 09. The new printing powder and the powdered material from the old powder storage bin 05 will be fully mixed in the mixer 10. The mixer 10 in this application is a horizontal spiral ribbon mixer;

[0059] The feeding end of the mixed material rotary vibrating screen 11 is connected to the discharge end of the mixer 10 through a pipeline, and a stop valve is connected in series between the two. After the new printing powder and the powdered material from the old powder storage bin 05 are mixed in the mixer 10, they will enter the mixed material rotary vibrating screen 11 for re-screening;

[0060] The feeding end of the mixed material storage bin 12 is connected to the discharge port of the undersize material of the mixed material rotary vibrating screen 11. After the new printing powder and the powdered material in the old powder storage bin 05 are mixed and re-screened, they will be transferred to the mixed material storage bin 12 for storage;

[0061] At the bottom inside the crushing bin 13, there are crushing blades 28. A driving motor 29 is installed on the crushing bin 13. The crushing blades 28 are fixed to the output rotating shaft of the driving motor 29. The crushing blades 28 are located above the driving motor 29. The crushing bin 13 is provided with an inlet 130 and an outlet 131. The second blanking port 031, the oversize discharge port of the old powder vibrating screen 06, and the oversize discharge port of the mixture vibrating screen 11 are all communicated with the inlet 130. The lumpy materials, the oversize materials of the old powder vibrating screen 06, and the oversize materials of the mixture vibrating screen 11 will fall into the crushing bin 13 due to the action of gravity; the outlet 131 is communicated with the first connection end of the second three-way pipe, and a butterfly valve eight is connected in series between them. The second connection end of the second three-way pipe is communicated with the feeding end of the old powder vacuum feeder 04 through a pipeline. The third connection end of the second three-way pipe extends outside the frame 02 through a pipeline, and a butterfly valve nine for controlling its on-off is installed on the third connection end of the second three-way pipe;

[0062] The high-speed rotating crushing blades 28 will break up the lumpy materials, the oversize materials of the old powder vibrating screen 06, and the oversize materials of the mixture vibrating screen 11. When the crushing blades 28 rotate, the powdered materials broken and lifted by the crushing blades 28 inside the crushing bin 13 will be sucked away by the old powder vacuum feeder 04;

[0063] A slag discharge pipe 52 is fixedly connected and communicated with the crushing bin 13. One end of the slag discharge pipe 52 far away from the crushing bin 13 can be communicated with an external vacuum cleaner. The lumpy materials that cannot be crushed by the crushing blades 28 can be sucked away by the external vacuum cleaner through the slag discharge pipe 52; a material level sensor is provided on the crushing bin 13. The material level sensor can monitor the accumulation height of the lumpy materials inside the crushing bin 13. The lumpy materials that cannot be broken by the crushing blades 28 will accumulate inside the crushing bin 13. When the lumpy materials that cannot be broken by the crushing blades 28 accumulate too much inside the crushing bin 13, the material level sensor is triggered, and the external vacuum cleaner can suck away the lumpy materials that cannot be broken by the crushing blades 28 inside the crushing bin 13 through the slag discharge pipe 52;

[0064] In this embodiment, the oversize discharge port of the mixture vibrating screen 11 is communicated with the feeding end of the old powder vibrating screen 06, that is, the oversize materials of the mixture vibrating screen 11 will fall into the old powder vibrating screen 06 due to their own gravity. The oversize materials of the mixture vibrating screen 11 will be screened again by the old powder vibrating screen 06, and the oversize discharge port of the old powder vibrating screen 06 is communicated with the inlet 130 of the crushing bin 13.

[0065] More specifically, it further includes a vertical jacking mechanism. The vertical jacking mechanism is installed on the frame 02. The vertical jacking end of the vertical jacking mechanism can be connected to the movable material box 01. The open end of the movable material box 01 can be tightly sealed against the bottom of the glove box 03 for flour cleaning. A rectangular feed inlet 032 is also provided at the bottom of the glove box 03 for flour cleaning. The feed inlet 032 can be communicated with the inside of the movable material box 01. The printing powder mixed with workpieces can enter the glove box 03 for flour cleaning after passing through the feed inlet 032. By designing the vertical jacking mechanism, after the movable material box 01 is arranged in place, the vertical jacking mechanism can lift the movable material box 01 upward, so that the open end of the movable material box 01 can be reliably and sealedly communicated with the glove box 03 for flour cleaning, that is, the printing powder will not leak from the connection between the open end of the movable material box 01 and the glove box 03 for flour cleaning.

[0066] A support frame 37 is provided at the lower end of the movable material box 01. A universal wheel 38 is fixed at the lower end of the support frame 37. The movable material box 01 can move flexibly.

[0067] The vertical jacking mechanism includes a guide rail 30, a slider 31, a telescopic cylinder 33, a bracket 32, a contact member 34, a proximity switch 1 35 and a controller 1 36. The guide rail 30 is vertically fixed on the frame 02. In this embodiment, there are two guide rails 30, and the two guide rails 30 are arranged in parallel. A slider 31 is slidably installed on each guide rail 30. The slider 31 can only slide up and down along the track length direction of the guide rail 30. The bracket 32 is fixed to the slider 31, that is, the bracket 32 can also move up and down. The telescopic cylinder 33 is vertically arranged and its fixed end is connected to the frame 02. The telescopic end of the telescopic cylinder 33 is connected to the bracket 32. When the telescopic end of the telescopic cylinder 33 extends or contracts, the bracket 32 will also move up and down. The telescopic cylinder 33 in this application is an electric cylinder. There are two contact members 34 and both are fixed to the bracket 32. The support frame 37 can be moved between the two brackets 32. Two jacking members 370 are provided on the support frame 37. The two contact members 34 can respectively contact the two jacking members 370. A proximity switch 1 35 is horizontally fixed on the frame 02. The controller 1 36 is installed on the frame 02. The proximity switch 1 35 and the telescopic cylinder 33 are both electrically connected to the controller 1 36. The detection end of the proximity switch 1 35 can be aligned with the outer side wall of the support frame 37. During the process of the support frame 37 moving between the two brackets 32, when the outer side wall of the support frame 37 approaches and triggers the proximity switch 1 35, the positions of the movable material box 01 and the feed inlet 032 are aligned. At this time, the telescopic cylinder 33 can drive the bracket 32 to move upward. When the bracket 32 moves upward, the contact member 34 contacts the jacking member 370, thereby driving the support frame 37 to move upward.

[0068] A plurality of limiting rollers are vertically rotatably mounted on the abutting member 34. During the process of the support frame 37 moving into the space between the two abutting members 34, the limiting rollers can rollingly abut against the support frame 37, and the limiting rollers can play a role in limiting the support frame 37.

[0069] The conveying mechanism includes a loading tray 14, a reduction motor 15, a driving synchronous pulley 16, a nut 17, a driven synchronous pulley 18, a synchronous belt 19, a lead screw 20, a connecting member 21, a guide rod 22, a proximity switch II 23, a baffle 24, and a controller II 25; the loading tray 14 is vertically slidably arranged in the mobile bin 01, the tray surface of the loading tray 14 is horizontally arranged, and printing powder mixed with workpieces can be placed on the loading tray 14; the reduction motor 15 is vertically fixed on the support frame 37, a driving synchronous pulley 16 is coaxially fixed on the output rotating shaft of the reduction motor 15, the lower end of the mobile bin 01 is provided with an opening and vertically rotatably supports the nut 17, the driven synchronous pulley 18 is located outside the mobile bin 01, the driven synchronous pulley 18 is coaxially fixed with the nut 17, and the synchronous belt 19 is sleeved on both the driving synchronous pulley 16 and the driven synchronous pulley 18 at the same time; the nut 17 is screwed on the lead screw 20, the upper end of the lead screw 20 is connected to the loading tray 14, the lower end of the lead screw 20 is fixed to the connecting member 21, and the connecting member 21 is located outside the mobile bin 01; a plurality of guide rods 22 are vertically arranged and evenly distributed along the circumferential direction of the driven synchronous pulley 18, a plurality of sliding holes are provided at the bottom of the mobile bin 01, and the upper ends of the plurality of guide rods 22 are fixed to the loading tray 14 after passing through the plurality of sliding holes respectively, and the lower ends of the plurality of guide rods 22 are all fixed to the connecting member 21; a proximity switch II 23 is fixed at the bottom inside the mobile bin 01, a baffle 24 is fixed on the lower tray surface of the loading tray 14, one side plate surface of the baffle 24 can be aligned with the detection end of the proximity switch II 23, the controller II 25 is fixed on the support frame 37, and both the reduction motor 15 and the proximity switch II 23 are electrically connected to the controller II 25. By designing the proximity switch II 23 and the baffle 24, the loading tray 1 can move down to the position; the guide rod 22 has two functions. One is to ensure that the lead screw 20 does not rotate, and the other is to guide and support to ensure that the loading tray 14 can stably move vertically; the reduction motor 15 can drive the driven synchronous pulley 18 to rotate, and when the driven synchronous pulley 18 rotates, it can also drive the nut 17 to rotate. The nut 17 is screwed on the lead screw 2, and the guide rod 22 will limit the rotation of the lead screw 20. Therefore, the lead screw 20 can rise or fall vertically.

[0070] More specifically, it further includes a positive suction and reverse blowing mechanism, a collecting hopper 48, and a blowing mechanism;

[0071] The positive suction and reverse blowing mechanism includes an installation box 42, a cartridge filter 43, a negative pressure vacuum pump 44, a blowing pipe 45, a gas tank 46, and a valve body 47. The installation box 42 is arranged inside the glove box 03 for flour cleaning. The cartridge filter 43 is arranged vertically. There are multiple cartridge filters 43, and all of them are located inside the glove box 03 for flour cleaning. The air outlet ends of the multiple cartridge filters 43 are fixed to and communicated with the installation box 42. The negative pressure vacuum pump 44 is fixed on the frame 02, and the air inlet end of the negative pressure vacuum pump 44 is communicated with the inside of the installation box 42. The blowing pipe 45 is fixed inside the installation box 42. The blowing pipe 45 is located above the cartridge filter 43 and there is a certain distance between them. Circular blowing holes are formed on the pipe wall of the blowing pipe 45. The number of blowing holes is the same as that of the cartridge filters 43. The blowing holes are arranged vertically downward. The aperture of the blowing holes is smaller than that of the air outlet ends of the cartridge filters 43. The blowing holes are vertically aligned with the air outlet ends of the cartridge filters 43. The gas ejected from the blowing holes can enter from the air outlet ends of the cartridge filters 43. The gas tank 46 is fixed on the glove box 03 for flour cleaning. The air outlet end of the gas tank 46 is communicated with one end of the blowing pipe 45, and a valve body 47 is connected in series between them. The air inlet end of the gas tank 46 can be connected to an external high-pressure gas source. The external high-pressure gas source can supply gas to the gas tank 46. After the valve body 47 is opened, the high-pressure gas in the gas tank 46 can blow air into the inside of the cartridge filter 43 through the blowing pipe 45 and the blowing holes, and the powdery material attached to the outer wall of the cartridge filter 43 can be blown off.

[0072] The aggregate hopper 48 is located below the glove box 03 for flour cleaning. The large opening end of the aggregate hopper 48 is fixed to the bottom of the glove box 03 for flour cleaning. A discharge port 033 is formed at the bottom of the glove box 03 for flour cleaning. The discharge port 033 corresponds to and is communicated with the large opening end of the aggregate hopper 48. Multiple cartridge filters 43 are all located above the discharge port 033. The powdery material on the outer wall of the cartridge filter 43 can be blown off and fall into the aggregate hopper 48. The small opening end of the aggregate hopper 48 is communicated with the old powder vacuum feeder 04 through a pipeline, and a butterfly valve ten is connected in series between them. The first material dropping port 030 is communicated with the inside of the aggregate hopper 48 through a pipeline. The new powder feeding box 08 is communicated with the glove box 03 for flour cleaning through a pipeline. When new printing powder is put into the new powder feeding box 08, the printing powder lifted in the new powder feeding box 08 can be timely sucked into the glove box 03 for flour cleaning and attached to the outside of the cartridge filter 43.

[0073] The blowing mechanism includes a blowing gun 49 and a spring air pipe 50. The blowing gun 49 is arranged inside the glove box 03 for powder cleaning. One end of the spring air pipe 50 is connected to the air inlet end of the blowing gun 49, and the other end of the spring air pipe 50 is connected to an external high-pressure air source. The blowing gun 49 has two functions. One is to blow the printing powder mixed with workpieces, so that the powdered material in the glove box 03 for powder cleaning can enter the first blanking port 030, the blanking port or the suction pipe 27, and the powdered material lifted in the glove box 03 for powder cleaning can be adsorbed and intercepted by the cartridge filter 43. The other is to maintain the pressure balance inside the glove box 03 for powder cleaning. Since there is an old powder vacuum feeder and a negative pressure vacuum pump 44 connected to the glove box 03 for powder cleaning, if the blowing gun 49 is not designed, a large negative pressure is likely to be formed inside the glove box 03 for powder cleaning.

[0074] A partition 51 is vertically fixed inside the glove box 03 for powder cleaning. A plurality of through holes 510 are evenly arranged on the partition 51. The partition 51 divides the inside of the glove box 03 for powder cleaning into a first cavity and a second cavity. The first blanking port 030, the second blanking port 031, the suction pipe 27 and the blowing gun 49 are all located in the first cavity, and the installation box 42 and the discharge port 033 are both located in the second cavity. The purpose of designing the partition 51 is to prevent the blocky material from entering the discharge port 033.

[0075] More specifically, it further includes a first weighing sensor 39, a second weighing sensor 40 and a third weighing sensor 41. One connection end of the first weighing sensor 39 is fixed to the frame 02, and the other connection end of the first weighing sensor 39 is fixed to the old powder storage bin 05. One connection end of the second weighing sensor 40 is fixed to the frame 02, and the other connection end of the second weighing sensor 40 is fixed to the mixer 10. One connection end of the third weighing sensor 41 is fixed to the frame 02, and the other connection end of the third weighing sensor 41 is fixed to the mixed material storage bin 12. The drive motor 29, the first weighing sensor 39, the second weighing sensor 40, the third weighing sensor 41, the level sensor, the proximity switch 35 and the telescopic cylinder 33 are all electrically connected to the first controller 36. The first controller 36 can control the opening and closing of the first butterfly valve, the second butterfly valve, the third butterfly valve, the fourth butterfly valve, the fifth butterfly valve, the sixth butterfly valve, the seventh butterfly valve, the eighth butterfly valve, the ninth butterfly valve, the tenth butterfly valve and the stop valve. From the above design, the quality of the printing powder in the old powder storage bin 05, the mixer 10 and the mixed material storage bin 12 can be known.

[0076] The new powder batching vacuum feeder 09 and the old powder batching vacuum feeder 07 are both located above the mixer 10. A mixed material vibrating screen 11 is arranged below the mixer 10, and a mixed material storage bin 12 is arranged below the mixed material vibrating screen 11. Above the pulverizing bin 13, there are arranged the glove box 03 for powder cleaning, the mixed material vibrating screen 11 and the old powder vibrating screen 06.

[0077] A negative pressure vacuum pump two 53 is fixed on the frame 02, and the gas connection ends of the new powder batching vacuum feeder 09, the old powder batching vacuum feeder 07, and the old powder vacuum feeder 04 are all connected to the negative pressure vacuum pump two 53 through gas paths.

[0078] The operation process of this powder recycling system:

[0079] In the first step, the worker pushes the mobile bin 01 between the two abutting parts 34. When the mobile bin 01 is directly opposite to the feed port 032, the telescopic cylinder 33 drives the bracket 32 to move upward, and then drives the mobile bin 01 to move upward, so that the open end of the mobile bin 01 is communicated with the feed port 032.

[0080] In the second step, the reduction motor 15 starts and drives the nut 17 to rotate. The rotation of the nut 17 causes the lead screw 20 to rise, and then realizes the rise of the load tray 14. The printing powder mixed with workpieces on the load tray 14 will enter the powder cleaning glove box 03.

[0081] In the third step, the worker uses the air blowing gun 49 to blow the printing powder mixed with workpieces. The powdered material in the powder cleaning glove box 03 will be sucked away by the old powder vacuum feeder 04, and the blocky material will be moved into the crushing bin 13 for crushing.

[0082] In the fourth step, the old powder vacuum feeder 04 negatively transports the powdered material in the powder cleaning glove box 03, the dust generated during the crushing of the blocky material in the crushing bin 13, and the dust generated when feeding new printing powder into the new powder feeding box 08 to the old powder storage bin 05.

[0083] In the fifth step, the powdered material in the old powder storage bin 05 will enter the old powder vibrating screen 06 for screening. The material passing through the screen of the old powder vibrating screen 06 will be negatively transported to the mixer 10 by the old powder batching vacuum feeder 07, and the material remaining on the screen of the old powder vibrating screen 06 will fall into the crushing bin 13 due to gravity for re-crushing.

[0084] In the sixth step, the new powder batching vacuum feeder 09 can negatively transport the new printing powder in the new powder feeding box 08 to the mixer 10, and the material passing through the screen of the old powder vibrating screen 06 and the new printing powder will be fully mixed in the mixer 10.

[0085] In the seventh step, the mixed material completed in the mixer 10 will enter the mixed material vibrating screen 11 for screening. The material passing through the screen of the mixed material vibrating screen 11 will enter the mixed material storage bin 12 for storage, and the material remaining on the screen of the mixed material vibrating screen 11 will enter the crushing bin 13 for re-crushing.

[0086] Blocky materials that cannot be broken will accumulate in the crushing bin 13. When the above-mentioned blocky materials accumulate to a certain amount in the crushing bin 13, the crushing bin 13 can be connected to an external vacuum cleaner, and the external vacuum cleaner can suck away the above-mentioned blocky materials;

[0087] When the old powder storage bin is full, the undersize of the old powder rotary vibrating screen 06 can be transported to the old powder storage container outside the frame 02. Conversely, when the old powder storage bin is short of materials, the above-mentioned old powder storage container can be connected to the feeding end of the old powder batching vacuum loader 07.

[0088] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts between the various embodiments, reference can be made to each other.

[0089] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A powder recycling system for a selective laser sintering printing device, characterized in that Including: A mobile bin (01), a frame (02), and a glove box for powder cleaning (03), an old powder vacuum feeder (04), an old powder storage bin (05), an old powder rotary vibrating screen (06), an old powder batching vacuum feeder (07), a new powder feeding box (08), a new powder batching vacuum feeder (09), a mixer (10), a mixture rotary vibrating screen (11), a mixture storage bin (12), and a crushing bin (13), all of which are installed on the frame (02); the upper end of the mobile bin (01) is open and its interior can hold printing powder mixed with workpieces, a conveying mechanism is installed on the mobile bin (01), and the conveying mechanism can convey the printing powder mixed with workpieces into the glove box for powder cleaning (03); a first discharge port (030) and a second discharge port (031) are provided at the lower end of the glove box for powder cleaning (03), a mesh plate (26) is covered at the first discharge port (030), and a suction pipe (27) is arranged inside the glove box for powder cleaning (03); the feeding end of the old powder vacuum feeder (04) is respectively connected to the first discharge port (030) and the suction pipe (27); the feeding end and the discharging end of the old powder storage bin (05) are respectively communicated with the discharging end of the old powder vacuum feeder (04) and the feeding end of the old powder rotary vibrating screen (06); the feeding end of the old powder batching vacuum feeder (07) is connected to the discharge port of the undersize material of the old powder rotary vibrating screen (06); the new powder feeding box (08) is provided with a new powder feeding port (080) and a new powder discharging port (081), and the new powder discharging port (081) is communicated with the feeding end of the new powder batching vacuum feeder (09); the feeding ports of the mixer (10) are respectively communicated with the discharging end of the old powder batching vacuum feeder (07) and the discharging end of the new powder batching vacuum feeder (09); the feeding end of the mixture rotary vibrating screen (11) is connected to the discharging end of the mixer (10); the feeding end of the mixture storage bin (12) is communicated with the discharge port of the undersize material of the mixture rotary vibrating screen (11); a crushing blade (28) is arranged inside the crushing bin (13), a driving motor (29) is installed on the crushing bin (13), the crushing blade (28) is fixed to the output rotating shaft of the driving motor (29), an inlet (130) and an outlet (131) are provided on the crushing bin (13), the second discharge port (031), the discharge port of the oversize material of the old powder rotary vibrating screen (06), and the discharge port of the oversize material of the mixture rotary vibrating screen (11) are all communicated with the inlet (130), and the outlet (131) is connected to the feeding end of the old powder vacuum feeder (04).

2. The powder recycling system of a selective laser sintering printing device according to claim 1, characterized in that, It further includes a vertical jacking mechanism which is installed on the frame (02). The vertical jacking end of the vertical jacking mechanism can be connected to the mobile bin (01). The open end of the mobile bin (01) can be hermetically abutted against the bottom of the glove box for flour cleaning (03). The bottom of the glove box for flour cleaning (03) is also provided with a feed inlet (032) which can communicate with the inside of the mobile bin (01). The printing powder mixed with workpieces can enter the glove box for flour cleaning (03) through the feed inlet (032).

3. The powder recycling system of a selective laser sintering printing device according to claim 2, characterized in that, A support frame (37) is provided at the lower end of the mobile bin (01), and a universal wheel (38) is fixed at the lower end of the support frame (37). The vertical jacking mechanism includes a guide rail (30), a slider (31), a telescopic cylinder (33), a bracket (32), a contact member (34), a proximity switch one (35) and a controller one (36). The guide rail (30) is vertically fixed on the frame (02), the slider (31) is slidably installed on the guide rail (30), the bracket (32) is fixed to the slider (31), the telescopic cylinder (33) is vertically arranged and its fixed end is connected to the frame (02), the telescopic end of the telescopic cylinder (33) is connected to the bracket (32). There are two contact members (34) both of which are fixed to the bracket (32). The support frame (37) can be moved between the two brackets (32). Two jacking members (370) are provided on the support frame (37), and the two contact members (34) can respectively abut against the two jacking members (370). The proximity switch one (35) and the controller one (36) are both installed on the frame (02). The proximity switch one (35) and the telescopic cylinder (33) are both electrically connected to the controller one (36). The detection end of the proximity switch one (35) can be aligned with the support frame (37). When the support frame (37) triggers the proximity switch one (35), the open end of the mobile bin (01) is in alignment with the position of the feed inlet (032).

4. The powder recycling system of a selective laser sintering printing device according to claim 3, characterized in that, It further includes a weighing sensor one (39), a weighing sensor two (40) and a weighing sensor three (41). One connection end of the weighing sensor one (39) is fixed to the frame (02), and the other connection end of the weighing sensor one (39) is fixed to the old powder storage bin (05). One connection end of the weighing sensor two (40) is fixed to the frame (02), and the other connection end of the weighing sensor two (40) is fixed to the mixer (10). One connection end of the weighing sensor three (41) is fixed to the frame (02), and the other connection end of the weighing sensor three (41) is fixed to the mixed material storage bin (12). The weighing sensor one (39), the weighing sensor two (40) and the weighing sensor three (41) are all electrically connected to the controller one (36).

5. The powder recycling system of a selective laser sintering printing device according to claim 3, characterized in that, The conveying mechanism includes a loading tray (14), a reduction motor (15), a driving synchronous pulley (16), a nut (17), a driven synchronous pulley (18), a synchronous belt (19), a lead screw (20), a connecting piece (21), a guide rod (22), a proximity switch II (23), a baffle (24), and a controller II (25). The loading tray (14) is arranged to slide vertically in the mobile bin (01), the disk surface of the loading tray (14) is horizontally arranged, and the printing powder mixed with workpieces can be placed on the loading tray (14); the reduction motor (15) is vertically fixed on the support frame (37), the driving synchronous pulley (16) is coaxially fixed on the output rotating shaft of the reduction motor (15), the lower end of the mobile bin (01) is provided with an opening and the nut (17) is vertically rotatably supported, the driven synchronous pulley (18) is located outside the mobile bin (01), the driven synchronous pulley (18) is coaxially fixed with the nut (17), and the synchronous belt (19) is sleeved on both the driving synchronous pulley (16) and the driven synchronous pulley (18) at the same time; the nut (17) is screwed on the lead screw (20), the upper end of the lead screw (20) is connected to the loading tray (14), the lower end of the lead screw (20) is fixed to the connecting piece (21), and the connecting piece (21) is located outside the mobile bin (01); a plurality of guide rods (22) are vertically arranged and evenly distributed along the circumference of the driven synchronous pulley (18), a plurality of sliding holes are provided at the bottom of the mobile bin (01), the upper ends of the plurality of guide rods (22) are fixed to the loading tray (14) after passing through the plurality of sliding holes respectively, and the lower ends of the plurality of guide rods (22) are all fixed to the connecting piece (21); the proximity switch II (23) is fixed to the inner bottom of the mobile bin (01), the baffle (24) is fixed to the lower disk surface of the loading tray (14), one side plate surface of the baffle (24) can be aligned with the detection end of the proximity switch II (23), the controller II (25) is fixed on the support frame (37), and both the reduction motor (15) and the proximity switch II (23) are electrically connected to the controller II (25).

6. The powder recycling system of a selective laser sintering printing device according to claim 1, characterized in that It also includes a positive suction and reverse blowing mechanism, a collecting hopper (48), and a blowing mechanism. The positive suction and reverse blowing mechanism includes an installation box (42), a cylindrical filter element (43), a negative pressure vacuum pump I (44), a blowing pipe (45), an air tank (46), and a valve body (47). The installation box (42) is arranged inside the glove box for flour cleaning (03). The cylindrical filter element (43) is arranged vertically. There are multiple cylindrical filter elements (43), and all of them are located inside the glove box for flour cleaning (03). The air outlet ends of the multiple cylindrical filter elements (43) are fixed and communicated with the installation box (42). The negative pressure vacuum pump I (44) is fixed on the frame (02), and the air inlet end of the negative pressure vacuum pump I (44) is communicated with the inside of the installation box (42). The blowing pipe (45) is fixed inside the installation box (42), and air blowing holes are formed in the pipe wall of the blowing pipe (45). The air blowing holes are communicated with the air outlet ends of the cylindrical filter elements (43). The air tank (46) is fixed on the glove box for flour cleaning (03). The air outlet end of the air tank (46) is communicated with one end of the blowing pipe (45), and the valve body (47) is connected in series between them. The air inlet end of the air tank (46) can be connected to an external high-pressure air source. The collecting hopper (48) is located below the glove box for flour cleaning (03). The large opening end of the collecting hopper (48) is fixed to the bottom of the glove box for flour cleaning (03). A discharge port (033) is formed in the bottom of the glove box for flour cleaning (03). The discharge port (033) corresponds to and is communicated with the large opening end of the collecting hopper (48). The multiple cylindrical filter elements (43) are all located above the discharge port (033). The small opening end of the collecting hopper (48) is communicated with the old powder vacuum feeding machine (04). The first material dropping port (030) is communicated with the inside of the collecting hopper (48) through a pipeline. The new powder feeding box (08) is communicated with the glove box for flour cleaning (03) through a pipeline. The blowing mechanism includes a blowing gun (49) and a spring air pipe (50). The blowing gun (49) is arranged inside the glove box for flour cleaning (03). One end of the spring air pipe (50) is communicated with the air inlet end of the blowing gun (49), and the other end of the spring air pipe (50) is communicated with an external high-pressure air source.

7. The powder recycling system of a selective laser sintering printing device according to claim 6, characterized in that A partition plate (51) is vertically fixed inside the glove box for flour cleaning (03). Multiple through holes (510) are evenly formed in the partition plate (51). The partition plate (51) divides the inside of the glove box for flour cleaning (03) into a first cavity and a second cavity. The first material dropping port (030), the second material dropping port (031), the material suction pipe (27), and the blowing gun (49) are all located in the first cavity. The installation box (42) and the discharge port (033) are both located in the second cavity.

8. The powder recycling system of a selective laser sintering printing device according to claim 1, characterized in that, The new powder batching vacuum loader (09) and the old powder batching vacuum loader (07) are both located above the mixer (10). The mixture rotary vibrating screen (11) is arranged below the mixer (10), and the mixture storage bin (12) is arranged below the mixture rotary vibrating screen (11). Above the pulverizing bin (13), there are arranged the glove box for cleaning powder (03), the mixture rotary vibrating screen (11), and the old powder rotary vibrating screen (06).

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