CN113232297B

CN113232297B - Powder cleaning equipment for selective laser sintering

Info

Publication number: CN113232297B
Application number: CN202110452656.7A
Authority: CN
Inventors: 赵杰; 宋翔宇
Original assignee: Anhui Huizheng Electronic Technology Co ltd
Current assignee: Anhui Huizheng Electronic Technology Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2022-03-11
Anticipated expiration: 2041-04-26
Also published as: CN113232297A

Abstract

The invention provides a powder cleaning device for selective laser sintering, wherein a box body is internally divided into a working cavity and a device cavity, the device cavity is divided into a powder cleaning cavity and a powder collecting cavity, the powder cleaning cavity and the powder collecting cavity are communicated through a channel, an installation box is arranged between the powder collecting cavity and the powder collecting cavity, guide plates which are arranged in a staggered mode are arranged in the powder collecting cavity, a vibrating screen and a powder collecting box are sequentially arranged below the guide plates, a sealing block and a wiping block fixedly connected with the sealing block are arranged in the powder cleaning cavity, a U-shaped box is arranged in the installation box, the U-shaped box and the powder cleaning cavity are communicated through a first air guide tube, a gas collecting end of the U-shaped box is communicated with the wiping block through a second air guide tube, a floating block and a power supply are arranged at the other end of the U-shaped box, an electromagnet matched with the installation box, a gas blocking magnetic block and a control magnet are arranged in the installation box, and a buckle assembly and a controller matched with the control magnet are arranged at the same time. In the using process, the powder is screened and recovered while the powder on the sintering area and the die is cleaned, the powder attached to the scanning mirror is cleaned, and the nitrogen is purified and recovered.

Description

Powder cleaning equipment for selective laser sintering

Technical Field

The invention relates to the technical field of selective laser sintering powder cleaning, in particular to powder cleaning equipment for selective laser sintering.

Background

The selective laser sintering is that SLS method adopts infrared laser as energy, the modeling material that uses is mostly the powder material, when processing, at first preheat the powder to the temperature that is slightly less than its melting point, then pave the powder under the effect of strickle, the laser beam carries out the selective sintering according to layering cross section information under computer control, carry out next layer sintering after one layer is accomplished, remove unnecessary powder after all sinterings, just can obtain a sintered part, because sinter the powder in the course of shaping, so there are a lot of powdery objects to pollute the office space in the work, general equipment will have independent office to place.

The publication number is "CN 211680011U", provides a clear powder equipment for selective laser sintering, including the storage silo, hoist mechanism, the controller, and the cabinet body that comprises last cabinet body and lower cabinet body, the side of last cabinet body is equipped with two first through-holes that are used for installing sealed gloves, the bottom of last cabinet body is equipped with the second through-hole, and be used for containing the third through-hole that the shaping jar of printing the work piece stretched into, storage silo and hoist mechanism are located lower cabinet body respectively, and the storage silo has the powder outlet, the powder inlet who communicates with the second through-hole, and the first motorised valve of controlling respectively that powder inlet and powder outlet open and close, second motorised valve, hoist mechanism is used for driving the shaping jar that contains the printing the work piece and stretches into the upper cabinet body from the lower cabinet body, and realize the airtight of upper cabinet body through the inseparable cooperation of shaping jar and third through-hole, in order to carry out the clear powder work to the printing the work piece.

However, the powder cleaning device for selective laser sintering still has obvious defects in the using process:

1. the selective laser sintering technology carries out deep powder cleaning treatment on the molded part, so that the subsequent treatment process of the part is simpler, more convenient and more effective, but in the working process of the laser sintering technology, a laser is not used for directly sintering the powder on the working surface, but the laser is irradiated to a scanning mirror, the powder is selectively sintered through the scanning mirror, the powder is easy to raise in the working environment in the sintering process, if the powder is attached to the scanning mirror and is not cleaned subsequently, the subsequent sintering precision can be influenced to a great extent, and meanwhile, the loss of the laser can be increased to a certain extent when the excessive powder is attached to the scanning mirror, so that the sintering efficiency is influenced;

2. in the working cavity of selective laser sintering, in order to ensure the sintering safety and prevent powder from being oxidized, nitrogen is often filled in the working cavity, but in the powder cleaning process, a large amount of nitrogen is cleaned together with the powder, and the powder cleaning mode is also a waste in nitrogen resources.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems occurring in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a powder cleaning device for selective laser sintering comprises a laser scanning mirror and a sintering area which are arranged inside a box body, wherein a first partition plate is arranged inside the box body, the box body is divided into a working cavity and a device cavity by the first partition plate, and the laser, the scanning mirror and the sintering area are arranged in the working cavity;

the equipment cavity comprises a powder cleaning cavity and a powder collecting cavity, an installation box is arranged between the powder cleaning cavity and the powder collecting cavity, the powder collecting cavity is communicated with the sintering area, a channel for communicating the powder cleaning cavity and the powder collecting cavity is arranged between the powder cleaning cavity and the powder collecting cavity, and a powder suction device is arranged in the channel;

the powder cleaning device is characterized in that a sealing block is movably arranged in the powder cleaning cavity, one side of the sealing block, close to a channel, is connected with a first spring with the inner wall of the powder cleaning cavity, one side of the powder cleaning cavity, close to the first spring, is provided with an air hole, the other side of the sealing block is fixedly connected with a wiping block which movably extends into the working cavity, the wiping block extends into the working cavity to be in movable contact with the scanning mirror, a cavity is formed in the wiping block, one side of the wiping block, in movable contact with the scanning mirror, is provided with a first air outlet hole, the other side of the wiping block is provided with an air inlet hole, the first air outlet hole and the air inlet hole are respectively communicated with the cavity, and one side of the wiping block, close to the air inlet hole, is provided with a clamping groove;

a second partition plate is arranged in the installation box and divides the interior of the installation box into a first installation cavity and a second installation cavity;

an electromagnet is fixedly arranged in the first installation cavity, the electromagnet is fixedly connected with a gas blocking magnetic block through a second spring, the gas blocking magnetic block movably extends into the channel, a control magnet is arranged on the other side of the electromagnet, a third spring is connected between the control magnet and the electromagnet, a buckle assembly is arranged on one side, away from the channel, of the first installation cavity, the buckle assembly comprises a supporting plate, a magnet clamping head and a fourth spring, the magnet clamping head is movably connected with the supporting plate through the fourth spring, the magnet clamping head is clamped when being in contact with the clamping groove, and a controller is arranged at one end, close to the buckle assembly, of the first installation cavity;

the utility model discloses a powder cleaning device, including U-shaped case, floater, power supply, first air duct, first air outlet hole, control valve and controller electric connection, the second air outlet hole has the second air duct with the inlet port intercommunication, the U-shaped case is equipped with the U-shaped case in the second installation cavity, be equipped with the first air duct that stretches into U-shaped case gas collection end in the second installation cavity, first air duct runs through first installation cavity and clear powder chamber intercommunication, the U-shaped case other end is equipped with the kicking block, kicking block fixedly connected with power, and the power cooperates with the electro-magnet under the promotion of kicking block, U-shaped case gas collection end has seted up the second venthole, be equipped with the control valve in the second venthole, control valve and controller electric connection, second venthole and inlet port intercommunication have the second air duct, U-shaped incasement portion is equipped with the scavenging solution.

Preferably, the purification liquid is water.

Preferably, a plurality of guide plates are arranged in the powder collecting cavity.

Preferably, the gas circulation parts between two adjacent baffles are arranged in a staggered mode.

Preferably, the powder collecting cavity is internally provided with a vibrating screen, and the vibrating screen is arranged below the guide plate.

Preferably, a powder collecting box is arranged in the powder collecting cavity and arranged below the vibrating screen.

Preferably, the communicating part of the equipment cavity and the sintering area is provided with an explosion-proof valve.

Compared with the prior art, the invention has the beneficial effects that:

1. the whole box body is divided into two parts by the first partition plate, powder in a sintering area and attached to a die are sucked, under the action of guide plates arranged in a staggered mode for collecting powder in the powder cavity, a large amount of powder falls onto the vibrating screen under the action of gravity and is separated from nitrogen, the vibrating screen screens agglomerated unqualified powder, qualified powder falls into the powder collecting box under the action of the vibrating screen and the gravity, the die does not need to be taken out in the whole process, powder transfer is reduced, powder oxidation is reduced, the box body serves as a closed environment, and the problem that dust is raised in the sintering process to pollute the environment is solved;

2. nitrogen with dust enters the powder cleaning cavity through the channel, the sealed block is driven to act on the wiping block, so that the wiping block extends into the working cavity and is in movable contact with the scanning mirror to wipe powder attached to the scanning mirror, preparation is provided for next sintering work, the wiping block wipes the powder on the scanning mirror completely, the laser loss can be reduced to a certain degree, the sintering efficiency is increased, the scanning mirror wiping process does not need manual participation, and the original nitrogen in the working cavity is utilized for driving;

3. when the wiping block extends into the working cavity to wipe the scanning mirror, the clamping assembly is clamped with a clamping groove formed in the wiping block to control the wiping block, subsequent gas enters the U-shaped box through the first gas guide pipe 33, nitrogen passes through an internal water solution, the nitrogen is gathered to a gas collection end of the U-shaped box while dust in the nitrogen is adsorbed by utilizing the characteristics that the nitrogen is insoluble in water and the density of the nitrogen is smaller than that of water, and purified nitrogen is recycled into the working cavity through subsequent structural cooperation;

4. after nitrogen with dust enters the U-shaped box, purified nitrogen is gathered at the gas collection end, liquid levels at two ends of the U-shaped box are changed under the action of the nitrogen, the floating block drives the power supply to move towards the electromagnet, when the power supply is in contact with the electromagnet, the electromagnet is provided with a magnetic drive gas blocking magnetic block which extends into the channel to block subsequent gas, the control magnetic block acts on the buckle assembly when acting on the controller to open the control valve, the wiping block can reset, and when the control magnetic block resets, the purified nitrogen is discharged into the working cavity through a first gas outlet hole formed in the wiping block.

The invention relates to a powder cleaning device for selective laser sintering, which is characterized in that after sintering is finished, a powder suction device is started to suck powder in a sintering area and powder on a die into a device cavity, when a mixture of nitrogen and the powder passes through guide plates arranged in a staggered mode in a powder collection cavity, a large amount of powder falls onto a vibrating screen under the action of the guide plates and gravity, the vibrating screen separates agglomerated powder, qualified reusable powder falls into a powder collection box to be recovered, a subsequent mixture of the nitrogen and a small amount of powder enters the powder cleaning cavity through a channel, a sealing block is driven to drive a wiping block to extend into a working cavity to be in movable contact with a scanning mirror, the powder attached to the scanning mirror in the sintering process is cleaned, the wiping block is fixed through the matching of a clamping groove and a clamping buckle component in the wiping process, and the subsequent nitrogen with the powder enters a U-shaped box through a first air guide tube, the water in the U-shaped case adsorbs the powder in the nitrogen gas, under the characteristic that nitrogen gas is difficult to be dissolved in water and density is less than water, nitrogen gas gathering after the purification is in the gas collection end of U-shaped case, along with the gathering of nitrogen gas, make the liquid level at U-shaped incasement both ends change, drive floating block drives the power and moves to the electro-magnet, when the power contacts with the electro-magnet, the electro-magnet has magnetism, drive fender gas magnetic path and control magnet motion, it blocks subsequent gas to keep off the gas magnetic path and stretch into in the passageway, control magnet is when extrusion controller opens the control valve and releases the purification nitrogen gas, act on buckle subassembly, make and wipe the piece and reset, nitrogen gas after the purification simultaneously is retrieved inside the working chamber through second air duct and first venthole, blow to the scanning mirror when retrieving, further clearance powder on the scanning mirror.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the installation case of the present invention;

FIG. 3 is an enlarged view of the structure of area A in FIG. 1 according to the present invention;

FIG. 4 is an enlarged view of the structure of the area B in FIG. 1 according to the present invention;

FIG. 5 is a schematic view of a wiper block in contact with a scanning mirror in accordance with the present invention;

FIG. 6 is a schematic view of a magnet chuck and slot clamp of the present invention;

FIG. 7 is a schematic view of the nitrogen gas entering the U-shaped tank of the present invention causing a change in the liquid level;

FIG. 8 is a schematic diagram of the power source in contact with the electromagnet according to the present invention;

FIG. 9 is a schematic view of the air blocking magnet extending into the channel and controlling the movement of the magnet toward the buckle assembly according to the present invention;

FIG. 10 is a schematic view of the control magnet acting on the bayonet elements while squeezing the controller in accordance with the present invention;

fig. 11 is a schematic diagram of the resetting of the structures of the present invention.

In the figure: the device comprises a box body 1, a laser 2, a scanning mirror 3, a sintering zone 4, a first clapboard 5, a working chamber 6, an equipment chamber 7, an installation box 8, a powder cleaning chamber 9, air holes 901, a powder collecting chamber 10, a channel 11, a powder suction device 12, a sealed block 13, a first spring 14, a wiping block 15, a cavity 16, a first air outlet 17, an air inlet 18, a clamping groove 19, a second clapboard 20, a first installation chamber 21, a second installation chamber 22, an electromagnet 23, an air blocking magnet 24, a second spring 25, a control magnet 26, a third spring 27, a support plate 28, a magnet clamping head 29, a fourth spring 30, a controller 31, a 32U-shaped box 33, a first air guide tube 33, a floating block 34, a power supply 35, a second air outlet 36, a control valve 37, a second air guide tube 38, a purifying liquid 39, a guide plate 40, a vibrating sieve 41, a powder collecting box 42 and an explosion-stopping valve 43.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 11, the present invention provides a technical solution:

a powder cleaning device for selective laser sintering comprises a laser 2, a scanning mirror 3 and a sintering area 4 which are arranged inside a box body 1, wherein laser emitted by the laser 2 passes through the scanning mirror 3 to selectively sinter powder laid on the sintering area 4, a first partition plate 5 is arranged inside the box body 1, the inside of the box body 1 is divided into two cavities by the first partition plate 5, the two cavities are respectively used for arranging the selective laser sintering device and subsequent powder cleaning devices, the inside of the box body 1 is divided into a working cavity 6 and a device cavity 7 by the first partition plate 5, the working cavity 6 is used for arranging a selective sintering instrument and a powder supply and spreading device, in order to ensure that the powder is not oxidized and the working cavity 6 is safe in working, the inside of the working cavity 6 is filled with nitrogen, so that dust raised during sintering can be prevented from exploding, the laser 2, the scanning mirror 3 and the sintering area 4 are arranged inside the working cavity 6, the device is arranged in the working cavity 6, so that the normal operation of the sintering device is ensured, and meanwhile, the device in the device cavity 7 can be separated from the device for sintering;

the installation box 8 is arranged in the equipment cavity 7, the installation box 8 is used for arranging a processing device for nitrogen, and can divide the equipment cavity 7 into a powder cleaning cavity 9 and a powder collecting cavity 10, and the installation box 8 divides the equipment cavity 7 into two cavities, the device arranged in the powder cleaning cavity 9 is used for cleaning the powder attached to the scanning mirror 3, the powder collecting cavity 10 is communicated with the sintering region 4, the communication arrangement can ensure that the subsequent powder suction device 12 can smoothly clean the powder in the sintering region 4, when a die embedded in the powder is exposed, the powder attached to the die is cleaned, a channel 11 for communicating the powder cleaning cavity 9 and the powder collecting cavity 10 is arranged between the powder cleaning cavity 9 and the powder collecting cavity 10, the communication arrangement is mainly used for ensuring that the sucked nitrogen can smoothly enter the powder cleaning cavity 9 when the powder suction device 12 adsorbs the powder on the sintering region 4 and the die, the powder on the scanning mirror 3 is cleaned by the driving wiping block 15, meanwhile, the sucked nitrogen can be ensured to smoothly enter the installation box 8, the structure in the installation box 8 can further clean dust doped in the nitrogen conveniently, the powder sucking device 12 is arranged in the channel 11, the arrangement of the powder sucking device 12 is the premise that the whole structure can run, the powder in the sintering area 4 and the powder on the die can be sucked into the powder cleaning cavity by the suction force provided by the powder sucking device 12, and meanwhile, the nitrogen sucked by the powder is conveyed to the subsequent structure;

the airtight block 13 is movably arranged in the powder cleaning cavity 9, the airtight block 13 is arranged between the channel 11 and the working cavity 6, and the airtight block 13 is arranged, so that nitrogen gas sent into the powder cleaning cavity 9 by the powder suction device 12 can better drive the airtight block 13 to move so as to drive the wiping block 15 fixedly connected with the airtight block 13 to extend into the working cavity 6 and movably contact with the scanning mirror 3, so that the wiping block 15 can wipe powder attached to the scanning mirror 3, the airtight block 13 is connected with the first spring 14 close to one side of the channel 11 and the inner wall of the powder cleaning cavity 9, the arrangement ensures that the subsequent airtight block 13 can do reset movement after one stroke is finished, the wiping block 15 can also do reset movement after one stroke is finished due to the fixed connection relationship between the airtight block 13 and the wiping block 15, the air holes 901 are formed in one side of the powder cleaning cavity 9 close to the first spring 14, the arrangement of the air holes 901 ensures that the sealed block 13 is not obstructed by residual nitrogen in the powder cleaning cavity 9 when being reset, the other side of the sealed block 13 is fixedly connected with the wiping block 15 which movably extends into the working cavity 6, the fixed connection ensures that the sealed block 13 can drive the wiping block 15 to move in the process of being pushed by the nitrogen so as to realize the cleaning and wiping work of the scanning mirror 3, the wiping block 15 movably extends into the working cavity 6, the subsequent wiping block 15 can wipe and clean the scanning mirror 3 arranged in the working cavity 6, the wiping block 15 extends into the working cavity 6 to movably contact with the scanning mirror 3, the wiping block 15 can movably contact with the scanning mirror 3 when extending into the working cavity 6, the wiping block 15 can contact with the scanning mirror 3 when ensuring that the wiping block 15 can wipe and clean the powder attached to the scanning mirror 3, the movable contact also ensures that the wiping block 15 can reset after moving for a stroke, and prepares for subsequent wiping work, the scanning mirror 3 is wiped repeatedly for a plurality of times, the wiping block 15 is internally provided with a cavity 16, the cavity 16 is provided with a first air outlet 17 for ensuring that nitrogen purified and dedusted subsequently can be matched with the air inlet 18 and the second air duct 38 through the first air outlet 17, the nitrogen purified and dedusted is recycled into the working cavity 6, and simultaneously the scanning mirror 3 is blown, so that powder attached to the scanning mirror 3 can be better clarified, the wiping block 15 is provided with a first air outlet 17 at one side which is in movable contact with the scanning mirror 3, the arrangement of the first air outlet 17 ensures that clean nitrogen which enters the cavity 16 through the second air duct 38 and the air inlet 18 can be recycled into the working cavity 6, and the first air outlet 17 is arranged at one side which is in movable contact with the scanning mirror 3, the recycled nitrogen can blow the scanning mirror 3, further powder attached to the scanning mirror 3 is removed, the other side of the wiping block 15 is provided with an air inlet hole 18, the arrangement of the air inlet hole 18 enables the subsequent purified and dedusted nitrogen to smoothly enter the cavity 16 through the second air duct 38, so that the nitrogen is discharged into the working cavity 6 from the first air outlet hole 17, and simultaneously the scanning mirror 3 is blown, the first air outlet hole 17 and the air inlet hole 18 are respectively communicated with the cavity 16, the communication of the three ensures that the subsequent purified and dedusted nitrogen can be smoothly recycled into the working cavity 6, the nitrogen is a necessary condition for recycling the purified nitrogen and is also a circulating channel 11, the side of the wiping block 15 close to the air inlet hole 18 is provided with a clamping groove 19 to arrange the clamping groove 19 at one side of the air inlet hole 18 and is also close to one side of the subsequent buckle assembly, in order that a subsequent transmission buckle component can be smoothly matched with the clamping groove 19 so as to control the operation of the wiping block 15, the clamping groove 19 is arranged so as to be matched with the subsequent buckle component, the wiping block 15 can be clamped in a main body in the process that the wiping block 15 extends into the working cavity 6 to wipe the scanning mirror 3, the subsequent nitrogen with dust can enter the U-shaped box 32 through the first air duct 33, the dust removal effect on the nitrogen is carried out through the internal purifying liquid 39, and meanwhile, through the matching of a device arranged in the U-shaped box 32, the wiping block 15 is reset while the purified nitrogen is recovered;

a second partition plate 20 is arranged in the installation box 8, the second partition plate 20 is used for dividing the installation box 8 into two independent cavities, and meanwhile, the smooth movement of a structure arranged in a subsequent first installation cavity 21 is guaranteed, a fixedly connected part is provided for the structure in the installation box 8, the second partition plate 20 divides the interior of the installation box 8 into a first installation cavity 21 and a second installation cavity 22, the first installation cavity 21 is used for arranging subsequent devices such as a buckle assembly and an electromagnet 23, the second installation cavity 22 is used for arranging a device for carrying out dust removal and purification on nitrogen with dust, the second installation cavity 22 is arranged below the first installation cavity 21, and the first installation cavity 21 is positioned at one side close to the scanning mirror 3;

the electromagnet 23 is fixedly arranged in the first mounting cavity 21, the electromagnet 23 is arranged to be matched with a subsequent floating block 34 and a power supply 35, when the floating block 34 pushes the power supply 35 to be in contact with the electromagnet 23, the electromagnet 23 has magnetism, when the floating block 34 and the electromagnet 23 are separated, the electromagnet 23 loses the magnetism, the electromagnet 23 is fixedly connected with the air blocking magnet 24 through the second spring 25, the air blocking magnet 24 is arranged to enable the air blocking magnet 24 to extend into the channel 11 to block subsequent nitrogen when the wiping block 15 is subjected to one-way wiping movement and needs to be reset, the air blocking magnet 24 can extend into the channel 11 to enable the airtight block 13 to lose the thrust of the nitrogen and reset under the action of the first spring 14, so that the wiping block 15 is driven to reset, the air blocking magnet 24 movably extends into the channel 11, a precondition is provided for the air blocking magnet 24 to block subsequent gas, and the normal operation of the subsequent structure is ensured, and the air blocking magnet 24 is slowly withdrawn from the channel 11 in the process of being withdrawn from the subsequent sealing block 13, after the sealing block 13 is withdrawn, the air blocking magnet 24 is completely withdrawn from the channel 11, the other side of the electromagnet 23 is provided with the control magnet 26, the control magnet 26 is arranged to be matched with the subsequent buckle assembly, meanwhile, when the subsequent control magnet 26 is pushed out by the acting force of the electromagnet 23, after the subsequent control magnet 26 moves to the position of the controller 31, the controller 31 is extruded, the controller 31 can be started, the third spring 27 is connected between the control magnet 26 and the electromagnet 23, two ends of the third spring 27 are respectively connected with the electromagnet 23 and the control magnet 26, when the subsequent control magnet needs to do the reset movement, the third spring 27 can act on the control magnet 26 to reset the control magnet 26, the buckle assembly is arranged on the side, away from the channel 11, of the first installation cavity 21, and the buckle assembly are arranged so that the wiping block 15 can be clamped with the main body under the action of the buckle assembly after moving to a certain position And is acted on the buckle component by subsequent structures, the function of the wiping block 15 is stopped at a proper time, the buckle component comprises a supporting plate 28, a magnet clamping head 29 and a fourth spring 30, the supporting plate 28 is acted on as long as the supporting plate is used for providing a supporting point for the fourth spring 30 and the magnet clamping head 29 to prevent the fourth spring 30 from falling off, meanwhile, a force exerting point is provided for the fourth spring 30, so that the fourth spring 30 can better act on the magnet clamping head 29, the magnet clamping head 29 is movably connected with the supporting plate 28 through the fourth spring 30, the two ends of the fourth spring 30 are respectively fixedly connected with the magnet clamping head 29 and the supporting plate 28, the magnet clamping head 29 is ensured to be in a pressed state when the wiping block 15 is in an initial position, meanwhile, the fourth spring 30 is also in a compressed energy storage state, when the magnet clamping head 29 is in contact with a clamping groove 19 formed in the wiping block 15 in the process, the magnet clamping head 29 extends under the action of the fourth spring 30 and is clamped with the clamping groove 19 so as to control the movement of the wiping block 15, the magnet clamping head 29 is clamped when in contact with the clamping groove 19 and provides a premise for the magnet clamping head 29 to control the movement of the wiping block 15, one end of the first mounting cavity 21, which is close to the clamping component, is provided with a controller 31, the controller 31 is arranged so as to control a subsequent control valve 37, when the control magnet 26 is acted by the electromagnet 23 to move, the controller 31 is firstly pressed and then acted on the clamping component, when the controller 31 is pressed, the controller 31 opens the control valve, purified and dedusted nitrogen can smoothly pass through the second air duct 38 and enter the cavity 16, and simultaneously is discharged into the working cavity 6 from the first air outlet hole 17 communicated with the cavity 16, the purified nitrogen is recycled, and the scanning mirror 3 is blown while being recycled, further cleaning the powder attached to the scanning mirror 3;

the second installation cavity 22 is internally provided with a U-shaped box 32, the U-shaped box 32 is arranged for purifying nitrogen doped with dust, the U-shaped design is to control the change of liquid level by collecting the purified nitrogen to control the electrification of the electromagnet 23, the second installation cavity 22 is internally provided with a first air duct 33 extending into the air collection end of the U-shaped box 32, the first air duct 33 extends into the U-shaped box 32 to ensure that air entering the U-shaped box 32 through the first air duct 33 enters subsequent purified liquid 39, the nitrogen can ascend to the air collection end through the difference of density and the characteristic of difficult water dissolution after being adsorbed and dust fall after entering the purified liquid 39, the nitrogen waits for subsequent release, the first air duct 33 penetrates through the first installation cavity 21 to be communicated with the powder cleaning cavity 9, the U-shaped box 32 is communicated with the powder cleaning cavity 9 through the first air duct 33, and the wiping block 15 is ensured to be fastened to the component owner, subsequent nitrogen can smoothly enter the U-shaped box 32 to purify and remove dust, the other end of the U-shaped box 32 is provided with a floating block 34, the floating block 34 can continuously change the position according to the change of the liquid level so as to drive the subsequent power supply 35 to move due to the arrangement of the floating block 34, the floating block 34 is fixedly connected with a power supply 35 which is fixedly connected with the power supply 35, so that the floating block 34 can smoothly drive the power supply 35 to move, the subsequent structure can be ensured to operate, the power supply 35 is matched with the electromagnet 23 under the pushing of the floating block 34, the floating block 34 drives the power supply 35 to move close to the electromagnet 23 along with the change of the liquid level, when the power supply 35 contacts the electromagnet 23, a coil outside the electromagnet 23 is electrified, the electromagnet 23 is magnetic at the moment, so as to drive the air blocking magnetic block 24 and the drive control magnet 26 to move, the air collection end of the U-shaped box 32 is provided with a second air outlet 36, the gas collection end is provided with a second gas outlet 36, so that the subsequent purified nitrogen can be smoothly extruded from the gas collection end by the purified liquid 39, a control valve 37 is arranged in the second gas outlet 36, the control valve 37 is arranged for controlling the gas collection and release functions of the gas collection end, the control valve 37 is electrically connected with the controller 31, the control valve 37 and the controller 31 are electrically connected, the control valve 37 can be opened and closed smoothly for the controller 31 to realize the release and collection of the nitrogen at the gas collection end, the second gas outlet 36 is communicated with the gas inlet 18 to form a second gas guide pipe 38, the communication of the second gas outlet and the gas inlet provides a channel for the purified nitrogen to be recycled to the working cavity 6, the purified liquid 39 is arranged in the U-shaped box 32, and the purified liquid 39 is incompatible with the nitrogen and is sealed and larger than the nitrogen, so that dust in the nitrogen can be adsorbed.

Specifically, the purifying liquid 39 is water, and if the purifying liquid 39 is water, the cost of purifying dust in nitrogen is reduced, water resources are easy to obtain, and meanwhile, nitrogen is insoluble in water, and the density of nitrogen is smaller than that of water, when the nitrogen doped with dust extends into water in the U-shaped box 32 through the first air duct 33, the nitrogen entering the U-shaped box rises and gathers at the gas collection end of the U-shaped box 32, and in the whole nitrogen recovery process, if the nitrogen is doped with other gases which are soluble in water, water can fuse some gases which are soluble in water while removing powder to a certain degree, so that the gases are separated from the nitrogen.

Specifically, receive the powder intracavity 10 and be equipped with a plurality of guide plates 40, the setting of guide plate 40 guarantees to block the powder when the effect of inhaling powder device 12 down with the adsorbed in-process of powder on sintering area 4 and the mould, makes the powder whereabouts under the effect of gravity, and nitrogen gas then continues the circulation.

Specifically, the gas circulation part between two adjacent guide plates 40 is arranged in a staggered manner, and the staggered arrangement ensures that a large amount of powder can fall off under the action of gravity to a greater extent under the action of the guide plates 40 arranged in a staggered manner after nitrogen and a large amount of powder mixture are sucked into the powder receiving cavity 10.

Specifically, receive powder chamber 10 and be equipped with reciprocating sieve 41, reciprocating sieve 41 is driven by external motor, and in order to the powder of whereabouts, carry out further screening, reject the unsuitable follow-up powder that uses of a part caking, reciprocating sieve 41 sets up in guide plate 40 below, sets up in the below of guide plate 40, has guaranteed the powder that drops under the effect of guide plate 40 that receives gravity and alternative setting, can be smooth drop on reciprocating sieve 41.

Specifically, receive to be equipped with in powder chamber 10 and receive powder case 42 to the qualified powder after guaranteeing to be screened by reciprocating sieve 41 can be retrieved, receives powder case 42 and sets up in reciprocating sieve 41 below, sets up below, when guaranteeing to screen, qualified powder whereabouts under the effect of gravity can be smooth enter into and receive powder case 42.

Specifically, the communicating part of the equipment cavity 7 and the sintering area 4 is provided with an explosion-stopping valve 43, during the screening process of the vibrating screen 41, a large amount of dust is easy to generate, and explosion is easy to occur, although the whole structure is operated under the environment filled with nitrogen, in order to ensure the safety of the selective laser sintering equipment, the explosion-stopping valve 43 is arranged at the position.

The working principle is as follows: after the sintering operation is finished, the user opens the powder suction device 12, the powder in the sintering area 4 is sucked into the equipment cavity 7 under the action of suction force, in the process of absorbing the powder, the mold is gradually exposed, and simultaneously the powder on the surface of the mold is also absorbed, at the moment, the mixture of the nitrogen and the powder enters the powder collecting cavity 10 under the action of the powder absorbing device 12, when the mixture of the nitrogen and the powder touches the guide plate 40, the powder falls under the action of gravity, the nitrogen flows out through the circulating part of the guide plate 40, the guide plates 40 arranged in a staggered way block a large amount of powder, the powder falls on the vibrating screen 41 under the action of gravity, under the screening of the vibrating screen 41, the agglomerated powder is removed, the qualified powder which can be used continuously falls into the powder collecting box 42 under the action of gravity in the screening process, the explosion-stopping valve 43 at the part of the powder collecting cavity 10 communicated with the sintering zone 4 plays a role of protecting equipment in the working cavity 6 in the screening process;

a large amount of powder falls into the powder receiving box 42 under the action of the guide plates 40 which are arranged in a staggered mode, some very fine powder enters the channel 11 along with nitrogen, enters the powder cleaning cavity 9 through the channel 11, acts on the sealing block 13, so that the sealing block 13 can drive the wiping block 15 to extend into the working cavity 6 to be in movable contact with the scanning mirror 3, the powder attached to the scanning mirror 3 is wiped, when the clamping groove 19 formed in the wiping block 15 moves to the position of the clamping and buckling assembly, the magnet clamping head 29 extends out under the action of the fourth spring 30 to be clamped with the clamping groove 19, the wiping block 15 stops moving at the moment, meanwhile, the first air guide pipe 33 is located between the sealing block 13 and the channel 11, and the subsequent nitrogen with dust enters the U-shaped box 32 through the first air guide pipe 33;

nitrogen with dust enters the U-shaped box 32, water is arranged in the U-shaped box 32, the density of the nitrogen is lower than that of the water, after the nitrogen with the dust is overflowed, the nitrogen rises and gathers at the gas collection end of the U-shaped box 32, meanwhile, powder in the nitrogen is adsorbed by the water, along with the slow gathering of the purified nitrogen at the gas collection end, the liquid level at the gas collection end gradually falls, the liquid level at the other end of the U-shaped box 32 gradually rises, the liquid level at the upper body pushes the floating block 34 to drive the power supply 35 to move towards the electromagnet 23, when the power supply 35 contacts the electromagnet 23, an external coil of the electromagnet 23 is electrified, and at the moment, the electromagnet 23 has magnetism;

the electromagnet 23 with magnetism acts on the gas blocking magnetic block 24 and the control magnet 26, firstly the gas blocking magnetic block 24 extends into the channel 11 to block subsequent gas, at this time, the airtight block 13 loses thrust of the gas, the U-shaped box does not enter nitrogen gas any more, then the control magnet 26 moves towards the controller 31 and the direction of the buckle component under the action of the electromagnet 23, during the movement, the controller 31 is squeezed, the controller 31 controls the control valve 37 at the gas collection end of the U-shaped box 32 to be opened, at this time, purified nitrogen gas at the gas collection end enters the cavity 16 inside the wiping block 15 through the second gas guide pipe 38, then enters the working cavity 6 through the first gas outlet 17, and simultaneously blows the scanning mirror 3, the control magnet 26 acts on the buckle component simultaneously when squeezing the controller 31, the magnet chuck 29 is sucked back under the magnetic action, at this time, the airtight block 13 does not have the action of the subsequent gas, the cleaning device is reset under the action of the first spring 14, meanwhile, the wiping block 15 is driven to reset, in the process of exhausting at the gas collection end of the U-shaped box 32, the liquid levels at the two ends change again, the power supply 35 leaves the electromagnet 23, the electromagnet 23 loses magnetism, the control magnet 26 and the gas blocking magnetic block 24 reset under the action of the third spring 27 and the second spring 25 respectively, and when the gas blocking magnetic block 24 is completely removed from the channel 11, the whole structure repeats the movement again.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a clear powder equipment for selective laser sintering, is including setting up in inside laser instrument (2) of box (1), scanning mirror (3) and sintering zone (4), its characterized in that: a first partition plate (5) is arranged inside the box body (1), the first partition plate (5) divides the interior of the box body (1) into a working cavity (6) and an equipment cavity (7), and the laser (2), the scanning mirror (3) and the sintering area (4) are arranged in the working cavity (6);

the equipment cavity (7) comprises a powder cleaning cavity (9) and a powder collecting cavity (10), an installation box (8) is arranged between the powder cleaning cavity (9) and the powder collecting cavity (10), the powder collecting cavity (10) is communicated with the sintering area (4), a channel (11) for communicating the powder cleaning cavity (9) and the powder collecting cavity (10) is arranged between the powder cleaning cavity (9) and the powder collecting cavity (10), and a powder suction device (12) is arranged in the channel (11);

a closed block (13) is movably arranged in the powder cleaning cavity (9), one side of the closed block (13) close to the channel (11) and the inner wall of the powder cleaning cavity (9) are connected with a first spring (14), one side of the powder cleaning cavity (9) close to the first spring (14) is provided with an air hole (901), the other side of the sealing block (13) is fixedly connected with a wiping block (15) which movably extends into the working cavity (6), the wiping block (15) extends into the working cavity (6) and is movably contacted with the scanning mirror (3), a cavity (16) is arranged in the wiping block (15), a first air outlet hole (17) is arranged on one side of the wiping block (15) which is movably contacted with the scanning mirror (3), an air inlet hole (18) is arranged on the other side of the wiping block (15), the first air outlet hole (17) and the air inlet hole (18) are respectively communicated with the cavity (16), a clamping groove (19) is formed in one side, close to the air inlet hole (18), of the wiping block (15);

a second partition plate (20) is arranged in the installation box (8), and the second partition plate (20) divides the interior of the installation box (8) into a first installation cavity (21) and a second installation cavity (22);

an electromagnet (23) is fixedly arranged in the first mounting cavity (21), the electromagnet (23) is fixedly connected with an air blocking magnet block (24) through a second spring (25), the air blocking magnetic block (24) movably extends into the channel (11), the other side of the electromagnet (23) is provided with a control magnet (26), a third spring (27) is connected between the control magnet (26) and the electromagnet (23), a buckle component is arranged on one side of the first mounting cavity (21) far away from the channel (11), the buckle component comprises a supporting plate (28), a magnet chuck (29) and a fourth spring (30), the magnet chuck (29) is movably connected with the supporting plate (28) through a fourth spring (30), when the magnet clamping head (29) is contacted with the clamping groove (19), the magnet clamping head is clamped, and one end of the first installation cavity (21) close to the clamping component is provided with a controller (31);

a U-shaped box (32) is arranged in the second mounting cavity (22), a first air duct (33) extending into the air collection end of the U-shaped box (32) is arranged in the second mounting cavity (22), the first air duct (33) penetrates through the first mounting cavity (21) and is communicated with the powder cleaning cavity (9), the other end of the U-shaped box (32) is provided with a floating block (34), the floating block (34) is fixedly connected with a power supply (35), and the power supply (35) is matched with the electromagnet (23) under the pushing of the floating block (34), a second air outlet hole (36) is arranged at the air collection end of the U-shaped box (32), a control valve (37) is arranged in the second air outlet hole (36), the control valve (37) is electrically connected with the controller (31), the second air outlet hole (36) is communicated with the air inlet hole (18) to form a second air duct (38), and the inside of the U-shaped box (32) is provided with a purifying liquid (39);

electromagnet (23) circular telegram back drive keeps off gas magnetic path (24) and stretches into passageway (11) inside and blocks gas, and drive control magnet (26) extrusion controller (31) open control valve (37), control magnet (26) act on buckle subassembly simultaneously, under magnetic effect, will magnet dop (29) are inhaled back, make wipe piece (15) and can reset, wipe the in-process exhaust nitrogen gas of piece (15) reset and blow up the clearance through wiping first venthole (17) on piece (15) scanning mirror (3).

2. The powder cleaning equipment for selective laser sintering according to claim 1, wherein: the purifying liquid (39) is water.

3. The powder cleaning equipment for selective laser sintering according to claim 1, wherein: a plurality of guide plates (40) are arranged in the powder collecting cavity (10).

4. A powder cleaning apparatus for selective laser sintering as claimed in claim 3, wherein: the gas circulation parts between two adjacent baffles (40) are arranged in a staggered way.

5. The powder cleaning equipment for selective laser sintering according to claim 4, wherein: a vibrating screen (41) is arranged in the powder collecting cavity (10), and the vibrating screen (41) is arranged below the guide plate (40).

6. The powder cleaning equipment for selective laser sintering according to claim 5, wherein: a powder collecting box (42) is arranged in the powder collecting cavity (10), and the powder collecting box (42) is arranged below the vibrating screen (41).

7. The powder cleaning equipment for selective laser sintering according to claim 1, wherein: and the communicating part of the equipment cavity (7) and the sintering area (4) is provided with an explosion-stopping valve (43).