Metal powder processing and feeding device

Abstract

The invention belongs to the technical field of 3D printing metal consumable machining, and particularly relates to a metal powder machining feeding device which comprises a charging barrel, a screening mechanism and a heating unit. The screening mechanism comprises a filter cartridge and a stirring assembly, the filter cartridge is rotationally arranged in the charging barrel, and the filter cartridge is in an annular shape and comprises a bottom plate and a filter screen; the discharging holes are formed in the bottom plate; the collecting bin is arranged in the charging barrel; metal powder is dried through heating of the heating unit, powder particles are stirred and scattered through the upper stirring assembly, the particles move outwards and collide with the filter screen to be scattered, caked powder can be scattered, the problems that the powder is affected with damp and caked are solved, the uniformity and mobility of the metal powder are improved, and therefore the feeding effect is improved. And powder particles are filtered and screened by arranging a filter screen, and after a discharge hole is opened, large-size particles fall into the collecting bin, so that the function of independently collecting the large-size particles is realized.

Description

Technical Field

[0001] The invention belongs to the field of 3D printing metal consumables processing, and specifically relates to a metal powder processing feeding device. Background Art

[0002] In 3D printing technology, metal powder is the material basis for the molding of metal parts. The quality of metal powder is crucial to the molding quality of 3D printing. Therefore, during the 3D printing process, when using metal powder as consumables for processing, it is necessary to pay attention to the quality control of metal powder feeding to ensure that the particle size, shape, fluidity and other characteristics of the metal powder meet the requirements of 3D printing.

[0003] A patent application with publication number CN112247159B discloses a feeding device for metal powder processing, including a feeding mechanism, a separation mechanism and a scattering mechanism, which can separate and scatter metal powder after cooperating with each other, and then screen and scatter the metal powder through the cooperation of grinding discs, grinding blocks and screen plates to avoid metal powder accumulation and agglomeration, thereby ensuring the subsequent finished product processing effect.

[0004] There are still some problems in the practical application of the above technical solution. The metal powder is broken up and screened before feeding. After screening, the powder particles that do not meet the particle size requirements can be filtered out. After breaking up, the problem of powder not meeting the shape requirements due to agglomeration can be solved. However, the reason for the agglomeration of metal powder is not only accumulation, but also the powder may be damp. Affected by the external working environment or storage environment, when the external humidity is high, the metal powder is easily damp. After the powder is damp, the moisture will be adsorbed on the surface of the powder particles to form a liquid bridge, which increases the cohesion between the particles and causes the fluidity of the metal powder to decrease, thereby affecting the subsequent 3D printing processing effect. The above technical square board does not deal with the fluidity problem of the metal powder, and the use effect is limited.

[0005] To this end, the present invention provides a metal powder processing and feeding device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a metal powder processing feeding device described in the present invention comprises a barrel, wherein the top and bottom of the barrel are respectively provided with a feed pipe and a discharge pipe, and further comprises a screening mechanism and a heating unit; The screening mechanism includes: a filter cartridge and a stirring assembly rotatably arranged inside the barrel, the filter cartridge is in a ring shape, and includes a bottom plate and a filter screen; a plurality of discharge holes arranged on the bottom plate; a collecting bin arranged inside the barrel, the collecting bin is located below the bottom plate, after the discharge holes are opened, the powder particles inside the filter cartridge fall into the collecting bin through the discharge holes; a gap is left between the outer wall of the filter cartridge and the inner wall of the barrel, the heating unit is arranged inside the barrel, and the heating unit is located outside the barrel.

[0008] Preferably, the stirring assembly includes: an annular support plate rotatably arranged in the barrel; a plurality of stirring rods fixedly connected to the bottom end of the annular support plate; the feed pipe, the filter barrel and the stirring assembly are coaxial, and the annular support plate is located between the feed pipe and the filter screen.

[0009] Preferably, the discharge hole is close to the inner ring side of the filter screen, and the screening mechanism also includes: a plurality of blocking plates movably plugged into the bottom plate for sealing the discharge hole; a tension spring arranged on the bottom plate for driving the blocking plate to move toward the center of the filter cylinder, and the blocking plate is offset from the discharge hole under the pull of the tension spring.

[0010] Preferably, the bottom end of the collecting bin is conical in shape, and further includes a recovery mechanism, the recovery mechanism including: a collecting bag disposed at the bottom end of the collecting bin, the collecting bag being concave in shape; a sealing seat fixedly connected to the bottom of the collecting bin, the sealing seat covering the outside of the collecting bag; a guide tube disposed inside the barrel, the bottom end opening of the guide tube being located above the collecting bag, and the top end opening of the guide tube being located outside the barrel; a plurality of rotatable impact rods disposed inside the sealing seat, the impact rods generating an upward impact force on the collecting bag after rotation, so that the powder particles remaining on the collecting bag move up into the guide tube and are discharged through the guide tube.

[0011] Preferably, the upper half of the guide tube is inclined, the top end of the impact rod is against the bottom of the collecting bag, and the bottom end of the impact rod is close to the bottom center of the collecting bag. The recovery mechanism also includes a movable tube slidably arranged at the bottom end of the guide tube, and a gap is left between the bottom end of the movable tube and the collecting bag. A plurality of impact rods are evenly distributed in a ring along the movable tube. After moving downward, the movable tube contacts the top end of the impact rod and drives the impact rod to rotate, so that the bottom end of the impact rod moves upward and hits the collecting bag.

[0012] Preferably, it also includes a driving mechanism, which includes: a support fixedly connected to the guide tube; an outer plate slidably arranged on the support; an inner rod movably inserted in the outer plate, the bottom end of the inner rod is fixedly connected to the movable tube; a ring plate fixedly connected to the inner rod; a main spring arranged between the ring plate and the outer plate; and a baffle plate slidably arranged on the support, the baffle plate blocking the bottom of the ring plate.

[0013] Preferably, the driving mechanism further comprises: a pushing spring provided on the support for pushing the baffle plate closer to the inner rod; and a pressure plate fixed to the outer plate, the pressure plate being used to push the baffle plate away from the inner rod after the pressure plate moves downward.

[0014] Preferably, a limit plate is provided on the top of the inner rod, and when the outer plate moves up, the inner rod is driven to move up through the limit plate, a slope is provided on the top of the ring side of the ring plate, and a bevel is provided on the bottom end of the pressure plate.

[0015] Preferably, the collecting bin is made of heat-conducting material, and the driving mechanism further comprises a temperature-changing component fixedly connected to the top end of the support for driving the outer plate to move up and down.

[0016] Preferably, the driving mechanism is provided with a plurality of groups, and the plurality of groups of driving mechanisms are evenly distributed in a ring along the guide tube.

[0017] The beneficial effects of the present invention are as follows: 1. The metal powder processing and feeding device described in the present invention dries the metal powder by heating the heating unit, and cooperates with the stirring component to stir and break up the powder particles, and the particles move outward and collide and disperse with the filter screen, so as to break up the agglomerated powder, which can not only improve the problems of powder moisture and agglomeration, but also improve the uniformity and fluidity of the metal powder, thereby improving the feeding effect; by setting the filter screen to filter and screen the powder particles, the larger powder particles will be blocked in the filter barrel, and after opening the discharge hole, the large-sized particles will fall downward into the collection bin through the discharge hole, thus realizing the function of separately collecting the large-sized particles without affecting the feeding work of the powder particles of normal size, and is easy to use.

[0018] 2. The metal powder processing and feeding device described in the present invention has a recovery mechanism. After the inner rod drives the movable tube to move downward quickly, the movable tube hits the impact rod, causing the impact rod to rotate. After the impact rod rotates, it generates an upward impact force on the center of the collecting bag, causing the large-sized particles remaining on the collecting bag to move upward quickly, and then the large-sized particles move to the outside of the barrel along the guide tube. In this way, the function of automatically discharging the screened large-sized particles to the outside of the barrel is achieved without affecting the feeding work of normal-sized powder particles, so that these large-sized particles can be recovered.

[0019] 3. The metal powder processing feeding device described in the present invention, by setting a driving mechanism and cooperating with the temperature change in the feeding barrel, drives the movable tube to move up and down, thereby realizing the function of automatically screening the metal powder each time the feeding work is carried out, and automatically discharging the screened large-size particles to the outside of the barrel for recovery after the feeding is completed. It not only has a high degree of automation, but also uses the heat generated during the feeding work as power, thereby improving the utilization rate of thermal energy. There is no need to set up an additional electrical drive system, which saves the use cost, simplifies the structure, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention; Figure 2 It is a half-section diagram of the present invention; Figure 3 It is an exploded view of the feed pipe, agitation assembly and filter cartridge; Figure 4 This is an exploded view of the filter cartridge and the plugging plate from above; Figure 5 It is a three-dimensional diagram of the coordination of the guide tube, the movable tube and the driving mechanism; Figure 6 It is an exploded view of the movable tube and a single set of driving mechanisms; Figure 7 It is an exploded view of the outer plate, inner rod and temperature-changing parts; Figure 8 It is an exploded view of the movable tube, collection bin and ram; Fig. 9 It is a bottom view of the collection bag and the striker; In the figure: 1. barrel; 2. feed pipe; 3. discharge pipe; 4. screening mechanism; 41. stirring assembly; 411. annular support plate; 412. stirring rod; 42. bottom plate; 43. filter screen; 44. discharge hole; 45. collecting bin; 46. blocking plate; 47. tension spring; 5. heating unit; 6. recovery mechanism; 61. collecting bag; 62. sealing seat; 63. guide tube; 64. impact rod; 65. movable tube; 7. driving mechanism; 71. support; 72. outer plate; 73. inner rod; 731. ring plate; 732. main spring; 733. limit plate; 74. baffle; 741. push spring; 75. pressure plate; 76. temperature variable component. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Embodiment 1

[0023] like Figure 1-8 As shown, a metal powder processing feeding device according to an embodiment of the present invention comprises a barrel 1, wherein a feed pipe 2 and a discharge pipe 3 are respectively provided at the top and the bottom of the barrel 1, and further comprises a screening mechanism 4 and a heating unit 5; The screening mechanism 4 includes: a filter cartridge and a stirring assembly 41 rotatably arranged inside the barrel 1, the filter cartridge is in a ring shape, and the filter cartridge includes a bottom plate 42 and a filter screen 43; a plurality of discharge holes 44 arranged on the bottom plate 42: a collecting bin 45 arranged inside the barrel 1, the collecting bin 45 is located below the bottom plate 42, after the discharge holes 44 are opened, the powder particles inside the filter cartridge fall into the collecting bin 45 through the discharge holes 44; a gap is left between the outer wall of the filter cartridge and the inner wall of the barrel 1, the heating unit 5 is arranged inside the barrel 1, and the heating unit 5 is located outside the barrel 1.

[0024] Specifically, the top of the feed pipe 2 is equipped with an openable cover plate, the filter barrel and the stirring assembly 41 can both rotate horizontally, the filter barrel and the stirring assembly 41 preferably but not limited to reverse rotation, the collecting bin 45 is preferably but not limited to being fixedly connected to the barrel 1, the collecting bin 45 and the filter screen 43 are sealed and connected, and according to specific circumstances, the collecting bin 45 can also be fixedly installed on the bottom end of the filter barrel; the metal powder processing feeding device is installed on a 3D printer for use, and the bottom end of the discharge pipe 3 is connected to the 3D printer for conveying metal powder to the 3D printer. Of course, a feeding device such as a spiral feeder can also be installed at the bottom end of the discharge pipe 3.

[0025] When in use, start the filter cartridge and the stirring assembly 41 to rotate, start the heating unit 5 to heat the inside of the barrel 1, and after closing the discharge hole 44, pour the metal powder into the feed pipe 2. The powder enters the filter cartridge along the feed pipe 2, and the filter cartridge drives the powder to rotate. The powder moves outward under the action of centrifugal force. Powder of qualified size passes through the filter screen 43 and falls downward, and flows into the 3D printer through the discharge hole 44. In this way, the function of feeding the 3D printer is realized.

[0026] Generally speaking, the fluidity of metal powder will be improved as the temperature rises. This is because the temperature rise will increase the internal energy of the powder particles and weaken the adsorption force between the particles. During the use of the feeding device, the metal powder is dried by heating the heating unit 5, and the stirring and breaking of the powder particles by the stirring component 41, and the collision and dispersion between the particles moving outward and the filter screen 43 can break up the agglomerated powder, which can not only improve the problem of moisture and agglomeration of the powder, but also improve the uniformity and fluidity of the metal powder, thereby improving the feeding effect; by setting the filter screen 43 to filter and screen the powder particles, the larger powder particles will be blocked in the filter cylinder, and these particles will stay on the bottom plate 42 and close to the filter screen 43. After opening the discharge hole 44, the large-sized particles fall downward into the collection bin 45 through the discharge hole 44. In this way, the function of collecting large-sized particles separately is realized without affecting the feeding of normal-sized powder particles, which is convenient to use.

[0027] like Figure 2-3 As shown, the stirring assembly 41 includes: an annular support plate 411 rotatably arranged in the barrel 1; a plurality of stirring rods 412 fixedly connected to the bottom end of the annular support plate 411; the feed pipe 2, the filter barrel and the stirring assembly 41 are coaxial, and the annular support plate 411 is located between the feed pipe 2 and the filter screen 43.

[0028] Specifically, the filter cartridge, the stirring assembly 41 and the feed pipe 2 are coaxially arranged, occupying a small space.

[0029] like Figure 2-4 As shown, the discharge hole 44 is close to the inner ring side of the filter screen 43, and the screening mechanism 4 also includes: a plurality of plugging plates 46 movably plugged on the bottom plate 42 for sealing the discharge hole 44; a tension spring 47 provided on the bottom plate 42 for driving the plugging plate 46 to move toward the center of the filter cylinder, and the plugging plate 46 is staggered from the discharge hole 44 under the pulling of the tension spring 47.

[0030] Specifically, the discharge hole 44 and the blocking plate 46 are distributed along the radial direction of the bottom plate 42. During the loading process, the filter cartridge rotates, and the centrifugal force generated by the blocking plate 46 is greater than the tension of the tension spring 47. Initially, the blocking plate 46 is close to the center of the bottom plate 42 under the action of the tension spring 47, and is staggered from the discharge hole 44, and the discharge hole 44 is in an open state. During the loading process, the filter cartridge rotates, and the blocking plate 46 moves in a direction away from the center of the bottom plate 42 under the action of centrifugal force, and blocks the discharge hole 44, thereby realizing the function of automatically opening and closing the discharge hole 44, without manual operation, and is easy to use.

[0031] like Figure 2-9As shown, the bottom end of the collecting bin 45 is conical in shape, and also includes a recovery mechanism 6, which includes: a collecting bag 61 arranged at the bottom end of the collecting bin 45, and the collecting bag 61 is concave; a sealing seat 62 fixedly connected to the bottom of the collecting bin 45, and the sealing seat 62 covers the outside of the collecting bag 61; a guide tube 63 arranged inside the barrel 1, and the bottom end opening of the guide tube 63 is located above the collecting bag 61, and the top end opening of the guide tube 63 is located outside the barrel 1; a plurality of rotatable impact rods 64 arranged inside the sealing seat 62, and the impact rods 64 generate an upward impact force on the collecting bag 61 after rotation, so that the powder particles remaining on the collecting bag 61 move up to the guide tube 63 and are discharged through the guide tube 63.

[0032] Specifically, the guide tube 63 is fixedly connected to the barrel 1, and an annular tube is fixedly connected to the inner bottom wall of the filter barrel. The guide tube 63 passes through the inside of the annular tube and is inserted into the inside of the collecting bin 45. After the discharge hole 44 is opened, the large-sized powder particles in the filter barrel fall into the collecting bin 45 through the discharge hole 44, slide along the bottom wall of the collecting bin 45 into the collecting bag 61, and finally accumulate at the center of the collecting bag 61.

[0033] like Figure 2-9 As shown, the upper half of the guide tube 63 is inclined, the top end of the impact rod 64 is against the bottom of the collection bag 61, and the bottom end of the impact rod 64 is close to the bottom center of the collection bag 61. The recovery mechanism 6 also includes a movable tube 65 slidably arranged at the bottom end of the guide tube 63, and a gap is left between the bottom end of the movable tube 65 and the collection bag 61. A plurality of the impact rods 64 are evenly distributed in a ring along the movable tube 65. After the movable tube 65 moves downward, it contacts the top end of the impact rod 64 and drives the impact rod 64 to rotate, so that the bottom end of the impact rod 64 moves upward and hits the collection bag 61.

[0034] Specifically, the movable tube 65 is located above the collecting bag 61. After the striker 64 rotates, the bottom end of the striker 64 moves upward and hits the collecting bag 61. By designing the center of the striker 64 or setting a reset torsion spring at the rotation position of the striker 64, the striker 64 is inclined, such as Figure 2 As shown, the upper end of the striker 64 abuts against the collection bag 61, and the lower section of the striker 64 is located within the inner circle of the movable tube 65; a gap is left between the movable tube 65 and the upper surface of the collection bag 61 so that the powder particles can slide into the collection bag 61; When processing large-sized powder particles, the movable tube 65 is moved downward quickly. After the movable tube 65 moves downward, it fits with the collecting bag 61 and hits the upper end of the impact rod 64, causing the impact rod 64 to rotate quickly. After the impact rod 64 rotates, its bottom end moves upward and pushes the collecting bag 61, generating an upward impact force on the bottom center of the collecting bag 61, causing the large-sized particles staying in the center of the collecting bag 61 to rise upward. In this process, since the movable tube 65 fits with the upper surface of the collecting bag 61, the movable tube 65 surrounds the outside of the accumulated large-sized particles, which can prevent the large-sized particles from bursting around, allowing the large-sized particles to enter the guide tube 63 along the movable tube 65 and be discharged to the outside of the barrel 1 through the guide tube 63. In this way, the function of removing the large-sized particles from the barrel 1 is completed, and the problem of a large number of large-sized particles accumulating in the collecting bin 45 and affecting the normal screening work is improved.

[0035] It should be noted that a collection box may also be provided at the top of the barrel 1 and below the top opening of the guide tube 63 to collect the discharged large-sized particles.

[0036] like Figure 2-8 As shown, it also includes a driving mechanism 7, which includes: a support 71 fixedly connected to the guide tube 63; an outer plate 72 slidably arranged on the support 71; an inner rod 73 movably inserted in the outer plate 72, and the bottom end of the inner rod 73 is fixedly connected to the movable tube 65; an annular plate 731 fixedly connected to the inner rod 73; a main spring 732 arranged between the annular plate 731 and the outer plate 72; and a baffle 74 slidably arranged on the support 71, and the baffle 74 blocks the bottom of the annular plate 731.

[0037] Specifically, a return spring for pushing the outer plate 72 upward can be provided on the support 71; the outer plate 72 can move up and down relative to the support 71, the inner rod 73 can move up and down relative to the outer plate 72, the baffle 74 can move horizontally, and the two ends of the return spring are respectively connected to the outer plate 72 and the support 71, and the main spring 732 is sleeved on the outside of the inner rod 73.

[0038] like Figure 2-7 As shown, the driving mechanism 7 also includes: a pushing spring 741 arranged on the support 71 for pushing the baffle 74 close to the inner rod 73; a pressure plate 75 fixed to the outer plate 72, and the pressure plate 75 is used to push the baffle 74 away from the inner rod 73 after moving downward.

[0039] Specifically, the two ends of the push spring 741 are respectively connected to the baffle 74 and the support 71. Initially, the baffle 74 is blocked under the ring plate 731 by the push of the push spring 741 to prevent the inner plate and the movable tube 65 from moving downward, thereby improving the position stability of the movable tube 65. A stable gap is left between the movable tube 65 and the collecting bag 61, thereby ensuring that large-sized particles can fall into the collecting bag 61 normally; after the outer plate 72 moves downward, the baffle 74 is pushed to move by the pressure plate 75, so that the baffle 74 is separated from the ring plate 731, and then the inner rod 73 can move downward.

[0040] like Figure 2-7 As shown, a limit plate 733 is provided at the top of the inner rod 73. After the outer plate 72 moves up, the inner rod 73 is driven to move up through the limit plate 733. The top of the ring side of the ring plate 731 is provided with a slope, and the bottom end of the pressure plate 75 is provided with a bevel.

[0041] Specifically, after the outer plate 72 and the inner rod 73 are both moved downward, when the outer plate 72 moves upward, the inner rod 73 is driven to move upward by the limit plate 733. After the inner rod 73 moves upward, the baffle plate 74 is pushed open by the slope on the ring plate 731. When the ring plate 731 moves up to above the baffle plate 74, the baffle plate 74 is blocked under the ring plate 731 again under the action of the push spring 741, thus completing the reset.

[0042] like Figure 2-7 As shown, the collecting bin 45 is made of heat-conducting material, and the driving mechanism 7 further includes a temperature-changing member 76 fixedly connected to the top of the support 71 for driving the outer plate 72 to move up and down.

[0043] Specifically, the temperature-changing element 76 is a material that automatically deforms and recovers due to temperature changes. The temperature-changing element 76 is preferably, but not limited to, a bimetallic strip.

[0044] When the feeding device is not working, the temperature inside the barrel 1 is room temperature, and the temperature-changing element 76 is in the initial state. At this time, the temperature-changing element 76 drives the outer plate 72 to be located at the bottom end of the moving range of the outer plate 72, and the inner rod 73 drives the movable tube 65 to move downward, and the movable tube 65 is close to the upper surface of the collecting bag 61.

[0045] When the material is being loaded, the heating unit 5 is started, the temperature in the barrel 1 rises, the temperature-changing element 76 is deformed by the heat, and the outer plate 72 is driven to move upward. After the outer plate 72 moves upward, the inner rod 73 and the movable tube 65 are driven to move upward, so that a gap is left between the movable tube 65 and the collecting bag 61, so that large-sized particles in the metal powder can slide into the collecting bag 61; After the feeding work is completed or the 3D printer is shut down, the filter cartridge stops rotating, the discharge hole 44 opens, the heating unit 5 stops heating, the temperature in the cartridge 1 decreases, the temperature-changing element 76 returns to its initial state, and drives the outer plate 72 to move downward. During the downward movement of the outer plate 72, the return spring and the main spring 732 are compressed. After the outer plate 72 moves downward, the pressure plate 75 contacts the baffle plate 74 and pushes the baffle plate 74 to move, so that the baffle plate 74 is separated from the ring plate 731. Without the restraint of the baffle plate 74, the main spring 732 releases energy and pushes the inner rod 73 to move downward quickly. The inner rod 73 drives the movable tube 65 to move downward quickly. After the movable tube 65 moves downward, it hits the impact rod 64, causing The striker rod 64 is caused to rotate, and after the striker rod 64 rotates, an upward impact force is generated on the center of the collecting bag 61, so that the large-sized particles remaining on the collecting bag 61 move up quickly, and then the large-sized particles move along the guide tube 63 to the outside of the barrel 1. In this way, the metal powder is automatically screened every time the feeding work is carried out, and after the feeding is completed, the screened large-sized particles are automatically discharged to the outside of the barrel 1. Not only is the degree of automation high, but also the heat generated during the feeding work is used as power, thereby improving the utilization rate of thermal energy. There is no need to set up an additional electrical drive system, which saves the use cost, simplifies the structure, and is easy to use.

[0046] It should be noted that the downward movement of the inner rod 73 occurs after the discharge hole 44 is opened; for the metal powder to be loaded, most of the powder particles are qualified, and only a few large-sized particles appear during loading. Therefore, there is no need to frequently clean the collection bin 45. Automatic cleaning once after each loading is completed or the machine is shut down can meet the cleaning needs of the collection bin 45. Embodiment 2

[0047] like Figure 2 As shown, in contrast to Example 1, another implementation of the present invention is that: the driving mechanism 7 is provided with a plurality of groups, and the plurality of groups of driving mechanisms 7 are evenly distributed in a ring along the guide tube 63 .

[0048] Specifically, multiple inner rods 73 are fixedly connected to the movable tube 65, and the movable tube 65 will not move downward until all the baffles 74 are separated from the ring plate 731; by setting up multiple sets of driving mechanisms 7, the power generated by multiple temperature-changing components 76 can be concentrated and released, thereby increasing the driving force generated and achieving better use effect.

[0049] Working principle: The metal powder processing and feeding device is installed on a 3D printer for use, and the bottom end of the discharge pipe 3 is connected to the 3D printer to deliver metal powder to the 3D printer. When in use, start the filter cylinder and the stirring assembly 41 to rotate, start the heating unit 5 to heat the inside of the barrel 1, and after the filter cylinder rotates, the blocking plate 46 moves away from the center of the bottom plate 42 under the action of centrifugal force, and blocks the discharge hole 44; after the discharge hole 44 is closed, pour the metal powder into the feed pipe 2, and the powder enters the filter cylinder along the feed pipe 2. The filter cylinder drives the powder to rotate, and the powder moves outward under the action of centrifugal force. Powder of qualified size passes through the filter screen 43 and falls downward, and flows into the 3D printer through the discharge hole 44. In this way, the function of feeding the 3D printer is realized; During the feeding process, the heating effect of the heating unit 5 will dry the metal powder, improve the problem of moisture and agglomeration of the powder, and cooperate with the stirring component 41 to stir and disperse the powder particles, and the particles move outward and collide and disperse with the filter 43, so that the agglomerated powder can be dispersed, and the uniformity and fluidity of the metal powder can be improved; by setting the filter 43 to filter and screen the powder particles, the larger powder particles will be blocked in the filter cylinder, and these particles will stay on the bottom plate 42 and close to the filter 43; During the loading process, the heating unit 5 is started, so that the temperature inside the barrel 1 increases, and the temperature-changing member 76 is deformed by the heat, driving the outer plate 72 to move upward. After the outer plate 72 moves upward, it drives the inner rod 73 and the movable tube 65 to move upward, so that a gap is left between the movable tube 65 and the collecting bag 61. After the loading work is finished or the 3D printer is shut down, the filter cartridge stops rotating, and the tension spring 47 pulls the blocking plate 46 back to reset, so that the discharge hole 44 is opened, and the large-sized particles fall downward into the collection bin 45 through the discharge hole 44, and slide along the bottom wall of the collection bin 45 into the collection bag 61, and finally accumulate at the center of the collection bag 61; the heating unit 5 stops heating, the temperature in the barrel 1 gradually decreases, the temperature-changing element 76 returns to its initial state, and drives the outer plate 72 to move downward; When the outer plate 72 moves downward, the return spring and the main spring 732 are compressed. After the outer plate 72 moves downward, the pressure plate 75 contacts the baffle plate 74 and pushes the baffle plate 74 to move, so that the baffle plate 74 is separated from the ring plate 731. Without the restraint of the baffle plate 74, the main spring 732 releases energy and pushes the inner rod 73 to move downward quickly. The inner rod 73 drives the movable tube 65 to move downward quickly. After the movable tube 65 moves downward, it hits the striker 64, causing the striker 64 to rotate. After the striker 64 rotates, it generates an upward impact force on the center of the collection bag 61, causing the large size of the large size of the large size of the large size of the large size of the large size of the large size of the large size of the large size The small-sized particles move up quickly, and then the large-sized particles move along the guide tube 63 to the outside of the barrel 1. In this way, the metal powder can be automatically screened without affecting the feeding of normal-sized powder particles. After the feeding is completed, the screened large-sized particles are automatically discharged to the outside of the barrel 1 so that these large-sized particles can be recycled. It not only has a high degree of automation, but also uses the heat in the feeding work as power, thereby improving the utilization rate of thermal energy. There is no need to set up an additional electrical drive system, which saves the use cost, simplifies the structure, and is easy to use.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A metal powder processing feeding device, comprising a barrel (1), wherein a feed pipe (2) and a discharge pipe (3) are respectively provided at the top and the bottom of the barrel (1), wherein: It also includes a screening mechanism (4) and a heating unit (5); The screening mechanism (4) comprises: Rotating a filter cartridge and a stirring assembly (41) disposed inside the barrel (1), wherein the filter cartridge is in a ring shape and comprises a bottom plate (42) and a filter screen (43); A plurality of discharge holes (44) provided on the bottom plate (42): a collecting bin (45) disposed in the barrel (1), the collecting bin (45) being located below the bottom plate (42); after the discharge hole (44) is opened, the powder particles inside the filter barrel fall into the collecting bin (45) through the discharge hole (44); A gap is left between the outer wall of the filter cartridge and the inner wall of the cartridge (1), the heating unit (5) is arranged inside the cartridge (1), and the heating unit (5) is located outside the cartridge (1).

2. A metal powder processing feeding device according to claim 1, characterized in that: The stirring assembly (41) comprises: Rotating an annular support plate (411) disposed in the barrel (1); A plurality of stirring rods (412) fixedly connected to the bottom end of the annular support plate (411); The feed pipe (2), the filter cartridge and the stirring assembly (41) are coaxial, and the annular support plate (411) is located between the feed pipe (2) and the filter screen (43).

3. A metal powder processing feeding device according to claim 2, characterized in that: The discharge hole (44) is close to the inner ring side of the filter screen (43), and the screening mechanism (4) further comprises: A plurality of blocking plates (46) movably plugged into the bottom plate (42) and used to seal the discharge holes (44); A tension spring (47) is provided on the bottom plate (42) and is used to drive the blocking plate (46) to move toward the center of the filter cartridge. The blocking plate (46) is offset from the discharge hole (44) under the pull of the tension spring (47).

4. A metal powder processing feeding device according to claim 3, characterized in that: The bottom end of the collecting bin (45) is in a cone shape, and further comprises a recovery mechanism (6), wherein the recovery mechanism (6) comprises: a collecting bag (61) disposed at the bottom end of the collecting bin (45), wherein the collecting bag (61) is concave in shape; A sealing seat (62) fixedly connected to the bottom of the collection bin (45), the sealing seat (62) covering the outside of the collection bag (61); a guide tube (63) disposed inside the barrel (1), wherein the bottom opening of the guide tube (63) is located above the collecting bag (61), and the top opening of the guide tube (63) is located outside the barrel (1); A plurality of impact rods (64) are rotatably arranged inside the sealing seat (62), and the impact rods (64) generate an upward impact force on the collection bag (61) after rotation, so that the powder particles remaining on the collection bag (61) move upward into the guide tube (63) and are discharged through the guide tube (63).

5. A metal powder processing feeding device according to claim 4, characterized in that: The upper half of the guide tube (63) is inclined, the top end of the striker (64) is against the bottom of the collection bag (61), and the bottom end of the striker (64) is close to the bottom center of the collection bag (61). The recovery mechanism (6) also includes a movable tube (65) slidably arranged at the bottom end of the guide tube (63), a gap is left between the bottom end of the movable tube (65) and the collection bag (61), and a plurality of strikers (64) are evenly distributed in a ring along the movable tube (65). After the movable tube (65) moves downward, it contacts the top end of the striker (64) and drives the striker (64) to rotate, so that the bottom end of the striker (64) moves upward and strikes the collection bag (61).

6. A metal powder processing feeding device according to claim 5, characterized in that: It also includes a driving mechanism (7), wherein the driving mechanism (7) includes: A support (71) fixedly connected to the guide tube (63); An outer plate (72) slidably disposed on the support (71); an inner rod (73) movably inserted into the outer plate (72), wherein the bottom end of the inner rod (73) is fixedly connected to the movable tube (65); A ring plate (731) fixedly connected to the inner rod (73); A main spring (732) provided between the ring plate (731) and the outer plate (72); A baffle (74) is slidably arranged on the support (71), and the baffle (74) is blocked below the ring plate (731).

7. A metal powder processing feeding device according to claim 6, characterized in that: The driving mechanism (7) further comprises: a push spring (741) disposed on the support (71) and used for pushing the baffle (74) closer to the inner rod (73); A pressure plate (75) fixedly connected to the outer plate (72), the pressure plate (75) being used to push the baffle plate (74) away from the inner rod (73) after moving downward.

8. A metal powder processing feeding device according to claim 7, characterized in that: A limit plate (733) is provided at the top of the inner rod (73); when the outer plate (72) moves upward, the inner rod (73) is driven to move upward via the limit plate (733); a slope is provided at the top of the ring side of the ring plate (731); and a bevel is provided at the bottom end of the pressure plate (75).

9. A metal powder processing feeding device according to claim 8, characterized in that: The collecting bin (45) is made of heat-conducting material, and the driving mechanism (7) further comprises a temperature-changing component (76) fixedly connected to the top of the support (71) and used for driving the outer plate (72) to move up and down.

10. A metal powder processing feeding device according to claim 9, characterized in that: The driving mechanisms (7) are provided in a plurality of groups, and the plurality of driving mechanisms (7) are evenly distributed in a ring shape along the guide tube (63).

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