Metal spherical powder screening device

Abstract

The utility model discloses a metal spherical powder screening device which comprises a blowing and knocking mechanism, a support, a material frame and a screening frame, the material frame is connected with the support through a spring, a vibration mechanism used for driving the material frame to vibrate is arranged on the material frame, the screening frame is installed on the material frame, and a main discharge port is formed in the material frame and located below the screening frame. The blowing and knocking mechanism is arranged below the screening frame and comprises a plurality of air blowing pipes capable of blowing air upwards and a knocking structure capable of knocking the screening frame. According to the device, the knocking structure is used for knocking the screening frame, compact solid ball powder particles blocking the screen can be separated from the screen, meanwhile, the blowing pipe is used for continuously blowing high-speed airflow to the bottom of the screening frame, and the compact solid ball powder particles blocking the screen move upwards and are thoroughly separated from the screen. It can be seen that the problem that solid metal spherical powder blocks meshes of the screen can be solved to a great extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing of metal materials, and specifically relates to a metal spherical powder screening device for 3D printing. Background Art

[0002] In recent years, 3D printing of metal materials has become the focus of attention in related industries, and its application fields are constantly expanding and the demand is constantly increasing. Correspondingly, metal raw material powders for 3D printing are also in short supply. The vigorous development of new 3D printing technologies has also given rise to many new problems. 3D printing requires that metal raw material powders have a certain fluidity, are dense spherical, and have a particle size within a certain range. In most cases, the metal raw material powders obtained by various powder making processes have a wide particle size distribution, and the particle size of the powder particles varies greatly. They need to be screened and graded before 3D printing can be performed. Screening can separate mixed metal raw material powders of different particle sizes into various particle size levels for 3D printing under different working conditions, thereby ensuring the quality of 3D printed products. Unlike the irregular pseudo-powder particles formed by the agglomeration of traditional small particles, the metal raw material powders for 3D printing are dense solid spherical particles. When screening, the solid spherical particles are dense and heavy. Once the mesh is blocked, the blockage is relatively solid, and the screen is difficult to clean. Practice has proved that the vibration of traditional vibrating screens cannot open blocked meshes, and the screening process requires frequent shutdowns to replace or manually clean the screen, which greatly reduces the screening efficiency, is labor-intensive, and even fails to complete the powder particle size classification. In contrast, when the traditional small particles are agglomerated and formed into irregular pseudo-powder particles, the vibration force can break them into small particles that form agglomerates when the traditional vibrating screen is screened, which is not easy to clog the screen, and the vibrating screen can achieve its particle size classification.

[0003] It can be seen that in view of the special needs of solid and dense metal spherical powder used in 3D printing, which is very easy to clog the mesh of the screen and is difficult to clean, providing a material screening device with high efficiency and good screening effect is an urgent problem to be solved in this field. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide a metal spherical powder screening device, which can solve the problem of solid metal spherical powder blocking the mesh of the screen to a large extent.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A metal spherical powder screening device comprises a purge and knocking mechanism, a bracket, a material frame and a screening frame. The material frame and the bracket are connected by a spring. The material frame is provided with a vibration mechanism for driving the material frame to vibrate. The screening frame is installed on the material frame. The material frame is provided with a main discharge port below the screening frame. The purge and knocking mechanism is arranged below the screening frame. The purge and knocking mechanism comprises a plurality of air blowing pipes capable of blowing air upwards and a knocking structure capable of knocking on the screening frame.

[0007] Preferably, the knocking structure includes an eccentric wheel and a servo motor, the servo motor is connected to the eccentric wheel, and the eccentric wheel is used to knock the screening frame.

[0008] Preferably, the screening frame comprises a screening frame and a screen mesh arranged at the bottom of the screening frame, and an eccentric wheel is arranged below the screen mesh, and the eccentric wheel is used to knock the screening frame.

[0009] Preferably, an anti-collapse frame is provided at the bottom of the screen, the anti-collapse frame is in contact with the screen, the anti-collapse frame is connected to the screening frame, and an eccentric wheel is provided below the anti-collapse frame, and the eccentric wheel is used to knock the anti-collapse frame.

[0010] Preferably, the connection between the screen and the screening frame is detachable.

[0011] Preferably, the purge and knocking mechanism also includes a slide frame, multiple air pipes and the knocking structure are all arranged on the slide frame, and a track is provided on the material frame below the bottom of the screening frame. The slide frame is arranged on the track and can move along the track, and the track extends from one end of the screening frame to the other end opposite to the end.

[0012] Preferably, the connection between the screening frame and the material frame is detachable.

[0013] Preferably, a dust cover capable of sealing the top of the screening frame is detachably connected to the top of the material frame, a feed port and an exhaust port are provided on the top of the dust cover, and both the feed port and the exhaust port can only be opened in one direction.

[0014] Preferably, the portion of the material frame below the screening frame is configured as a funnel structure, and the main discharge port is disposed at the lower end of the funnel structure.

[0015] Preferably, the vibration mechanism adopts a vibration motor, and the vibration motor is arranged at the upper end of the funnel structure.

[0016] The utility model has the following beneficial effects:

[0017] In the metal spherical powder screening device of the utility model, a plurality of air blowing pipes capable of blowing air upward and a knocking structure capable of knocking the screening frame are arranged. The knocking structure is used to knock the screening frame. On the one hand, the knocking action can cause the sieve holes of the screen on the screening frame to be slightly deformed, so that the dense solid spherical powder particles blocking the screen are temporarily separated from the screen. On the other hand, due to the inertia effect, the dense solid spherical powder particles blocking the screen are forcibly separated from the screen. During the knocking process, the air blowing pipe is used to continuously blow high-speed airflow to the bottom of the screening frame (i.e., the screen), so that the dense solid spherical powder particles blocking the screen are separated from the screen. The solid ball powder particles move upward and are completely separated from the screen. At the same time, during the screening process, high-speed airflow is continuously blown to the bottom of the screening frame (i.e., the screen) through the air blowing pipe, which can improve the overall looseness of the dense solid ball powder particles being screened and make them less likely to accumulate, thereby effectively reducing the situation where the dense solid ball powder particles block the screen. It can be seen that the utility model can greatly reduce the situation where the dense solid ball powder particles completely block the screen, effectively solving the problem that the 3D printed dense spherical metal powder is very easy to block the screen and is difficult to clean, improving the screening efficiency and effect, and extending the service life of the screen. In addition, the vibration mechanism in the utility model can drive the material frame to vibrate, and the material frame can drive the screening frame to vibrate after the vibration, thereby realizing the normal screening process of the utility model. The material frame and the bracket are connected by a spring. On the one hand, the spring can be used to achieve vibration isolation between the material frame and the screening frame, reducing the noise during the screening process, and at the same time, it can avoid external vibration from being transmitted to the screening frame, preventing the external vibration from being superimposed on the vibration of the vibration mechanism and affecting the normal screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the spherical metal powder screening device of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the purge and knocking mechanism of the utility model;

[0020] Figure 3 This is a schematic diagram of the screening frame structure of the utility model;

[0021] Figure 4 It is a schematic diagram of the material frame structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the dust cover of the utility model;

[0023] Figure 6 It is a schematic diagram of the support structure of the utility model;

[0024] The accompanying drawings are marked as follows: blowing and knocking mechanism-1; sliding frame-101; blowing pipe-102; eccentric wheel-103; servo motor-104; bracket-2; frame-201; spring-202; vibration mechanism-203; material frame-3; funnel structure-301; main discharge port-302; screening frame-4; screening frame-401; screen-402; anti-collapse frame-403; auxiliary discharge port-404; dust cover-5; feed port-501; exhaust port-502; handle-503. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] The directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, side, etc., are merely directions in the drawings and are only used to explain and illustrate the present invention, rather than to limit the scope of protection of the present invention.

[0027] like Figure 1 As shown, the utility model provides a spherical metal powder screening device, which includes a purge and knocking mechanism 1, a bracket 2, a material frame 3, a screening frame 4 and a dust cover 5. Figure 2 As shown, the blowing and knocking mechanism 1 includes a slide frame 101, a row of blowing pipes 102 installed on the left side of the slide frame 101, an eccentric wheel 103 installed on the right side of the slide frame 101, and a servo motor 104 for controlling the rotation of the eccentric wheel 103; see Figure 1 and Figure 6 The bracket 2 includes a frame 201 formed by welding metal parts, and springs 202 are respectively installed at the four corners of the upper end surface of the frame 201; Figure 3 As shown, the lower part of the material frame 3 is set as a funnel structure 301, and the funnel structure 301 facilitates the falling and collection of the sieved powder; the screening frame 4 is stacked inside the material frame 3 from the upper port of the material frame 3, and the screening frame 4 includes a screening frame 401 and a screen 402, and the screen 402 is detachably arranged on the screening frame 401, and the bottom screen 402 can be replaced with different meshes according to the screening requirements. An anti-collapse frame 403 for preventing the screen from collapsing is installed at the bottom of the screen 402, and the anti-collapse frame 403 is detachably connected to the screening frame 401; a feed port 501, an exhaust port 502 and a handle 503 are provided on the top of the dust cover 5, and the feed port 501 and the exhaust port 502 can only be opened in one direction. When the screening device is working, the lower edge of the dust cover 5 and the upper edge of the material frame 3 are fixed by buckles, and the dust cover 5, the material frame 3 and the screening frame 401 are fixed together. At the same time, sealing strips may be provided on the contact surface between the dust cover 5 and the screening frame 401 and the contact surface between the screening frame 401 and the material frame 3 to avoid dust pollution.

[0028] like Figure 4 As shown, the main body of the material frame 3 is a rectangular box body with an opening facing upward, and the upper and lower edges of the material frame 3 extend outward to form a skirt board, and the lower end of the material frame contracts to form a funnel structure, and a main discharge port 302 is provided. The skirt board at the upper edge of the material frame 3 is used to support the skirt board at the upper edge of the screening frame 401, thereby supporting the entire screening frame 4, and directly embedding the screening frame 4 into the inner cavity of the material frame 3 from the opening above the material frame 3, so as to realize the detachable connection between the screening frame 4 and the material frame 3. The skirt board at the lower edge of the material frame 3 can be connected to the springs 202 respectively installed at the four corners of the upper end surface of the frame 201, thereby realizing the connection between the material frame 3 and the frame 201.

[0029] like Figure 3 As shown, the main body of the screening frame 4 is a rectangular box body with an opening facing upward, including a rectangular screening frame 401 and a screen 402. The upper edge of the screening frame 401 extends outward to form a skirt board, and the screening frame 401 can be set on the material frame 3 through the skirt board.

[0030] An auxiliary discharge port 404 is provided on the front side of the screening frame 401 . The auxiliary discharge port 404 passes through the side of the material frame 3 . The pipe of the auxiliary discharge port 404 is a flexible pipe.

[0031] The vibration mechanism 203 uses a vibration motor, which is arranged below the material frame 3 (ie, at the funnel structure 301) and is installed obliquely.

[0032] The dust cover 5 is detachably mounted on the upper portion of the screening frame 4 , and the dust cover 5 is detachably connected to the material frame 3 via a buckle and a sealing strip.

[0033] A track is provided on the material frame 3 below the bottom of the screening frame 4, and the slide 101 is arranged on the track and can move along the track, and the track extends from the left end of the screening frame 4 to the right end, so as to achieve full coverage and blowing of the screen 402. The installation form of the slide 101 on the track can be: a motor-driven running wheel is installed on the slide 101, and the slide 101 moves back and forth on the track through the running wheel; after the eccentric wheel 103 is driven by the servo motor 104, the eccentric wheel 103 will rotate and intermittently knock the anti-collapse frame 403, and the anti-collapse frame 403 can drive the screen 402 to vibrate, which further cleans the screen. In addition, the eccentric wheel 103 can also directly knock on the screening frame 401 or the screen 402, and the vibration of the knocking can be transmitted to the screen 402, which can also play a further cleaning role on the screen. At this time, the anti-collapse frame 403 may be provided, or it may not be provided. When the anti-collapse frame 403 is provided, the overall rigidity of the screen 402 can be increased to prevent the middle portion from collapsing and causing deformation of the screen hole size.

[0034] In the utility model, a row of air blowing pipes 102 of the purge and knocking mechanism has a gas blowing port, and when working, the air pressure can be set to 0.3-3.0MPa.

[0035] It can be seen from the above scheme that in view of the problems existing in the prior art, the spherical metal powder screening device of the utility model can make the materials falling into the screening frame vibrate continuously and move forward during the vibration through the design of the vibration motor and the spring, thereby solving the problem of poor screening effect. Through the blowing and knocking mechanism, the powder particles that block the mesh of the screen can be blown away and discharged as the screened material, thereby improving the screening efficiency. The spherical metal powder screening device of the utility model can make the materials falling into the screening frame vibrate continuously and move forward during the vibration through the design of the vibration motor and the spring, and the blowing and knocking mechanism under the screen moves back and forth, and the high-pressure airflow ejected from the air pipe sweeps the screen from bottom to top. At the same time, the eccentric wheel on the sliding frame rotates and knocks the anti-collapse frame to make the screen vibrate. The combined effect of the blowing of the high-pressure airflow and the knocking of the eccentric wheel solves the problem that it is difficult to clean after the solid spherical metal powder blocks the mesh of the screen, thereby improving the screening efficiency and extending the service life of the screen.

[0036] In order to verify the powder feeding effect of the fine particle powder feeding device of the utility model, the following examples are given.

[0037] Example 1: Take 1kg of spherical titanium powder. If the purging and knocking system is turned off and sieved with a 325-mesh sieve for 20 minutes, the sieved material is 885g, the sieved powder is 114.6g, and the sieved material is subjected to laser particle size distribution, and particles less than 45 microns account for 45.3%; take 1kg of spherical titanium powder from the same batch, if the purging and knocking system is turned on and sieved with a 325-mesh sieve for 10 minutes, the sieved material is 471.4g, and 528g of small-particle spherical titanium powder is sieved. The sieved material is subjected to laser particle size distribution, and particles less than 45 microns account for 4.2%; continue to sieve for 10 minutes, then the sieved material is 468.3g, and 531g of small-particle spherical titanium powder is sieved. The sieved material is subjected to laser particle size distribution, and particles less than 45 microns account for 3.6%; it shows that turning on the purging and knocking system can prevent powder particles from clogging the mesh and allow fine-particle powder to be screened thoroughly.

[0038] Example 2: Take 1kg of spherical high-temperature alloy GH4169 powder. If the purge and knocking system is turned off and sieved with a 270-mesh screen for 15 minutes, the sieved material is 862.2g, the sieved powder is 137.1g, and the sieved material is subjected to laser particle size distribution. Particles less than 53 microns account for 49.1%; Take 1kg of spherical high-temperature alloy GH4169 powder from the same batch. If the purge and knocking system is turned on and sieved with a 270-mesh screen for 5 minutes, the sieved material is 465.6g, and 533g of small-particle spherical titanium powder is obtained by screening. The laser particle size distribution of the sieve material showed that particles smaller than 53 microns accounted for 4.6%; the screening was continued for 10 minutes to obtain 460.3 g of the sieve material, and 538 g of small-particle spherical titanium powder was obtained through screening. The laser particle size distribution of the sieve material showed that particles smaller than 53 microns accounted for 3.3%; this shows that turning on the purge and knocking system can prevent powder particles from clogging the mesh and allow fine-particle powder to be screened thoroughly, further illustrating that the spherical metal powder screening device of the utility model has greatly improved the screening efficiency and effect of spherical metal powder.

Claims

1. A metal spherical powder screening device, characterized in that: The invention comprises a blowing and knocking mechanism (1), a bracket (2), a material frame (3) and a screening frame (4); the material frame (3) and the bracket (2) are connected via a spring (202); a vibration mechanism (203) for driving the material frame (3) to vibrate is provided on the material frame (3); the screening frame (4) is mounted on the material frame (3); a main material outlet (302) is provided on the material frame (3) below the screening frame (4); the blowing and knocking mechanism (1) is arranged below the screening frame (4); the blowing and knocking mechanism (1) comprises a plurality of blowing pipes (102) capable of blowing air upwards and a knocking structure capable of knocking the screening frame (4).

2. A metal spherical powder screening device according to claim 1, characterized in that: The knocking structure comprises an eccentric wheel (103) and a servo motor (104); the servo motor (104) is connected to the eccentric wheel (103); and the eccentric wheel (103) is used to knock the screening frame (4).

3. A metal spherical powder screening device according to claim 2, characterized in that: The screening frame (4) comprises a screening frame (401) and a screen (402) arranged at the bottom of the screening frame (401); an eccentric wheel (103) is arranged below the screen; and the eccentric wheel (103) is used to knock the screening frame (4).

4. A metal spherical powder screening device according to claim 3, characterized in that: An anti-collapse frame (403) is provided at the bottom of the screen (402), the anti-collapse frame (403) is in contact with the screen (402), the anti-collapse frame (403) is connected to the screening frame (401), an eccentric wheel (103) is provided below the anti-collapse frame (403), and the eccentric wheel (103) is used to knock the anti-collapse frame (403).

5. A metal spherical powder screening device according to claim 3 or 4, characterized in that: The connection between the screen (402) and the screening frame (401) is detachable.

6. The metal spherical powder screening device according to claim 1, characterized in that: The blowing and knocking mechanism (1) also includes a slide frame (101), a plurality of blowing pipes (102) and the knocking structure are all arranged on the slide frame (101), a track is arranged on the material frame (3) below the bottom of the screening frame (4), the slide frame (101) is arranged on the track and can move along the track, and the track extends from one end of the screening frame (4) to the other end opposite to the end.

7. The metal spherical powder screening device according to claim 1, characterized in that: The connection between the screening frame (4) and the material frame (3) is detachable.

8. The metal spherical powder screening device according to claim 1, characterized in that: The top of the material frame (3) is detachably connected to a dust cover (5) capable of sealing the top of the screening frame (4); a feed port (501) and an exhaust port (502) are provided on the top of the dust cover (5); and both the feed port (501) and the exhaust port (502) can only be opened in one direction.

9. The metal spherical powder screening device according to claim 1, characterized in that: The portion of the material frame (3) below the screening frame (4) is configured as a funnel structure (301), and the main discharge port (302) is provided at the lower end of the funnel structure (301).

10. The metal spherical powder screening device according to claim 9, characterized in that: The vibration mechanism (203) uses a vibration motor, and the vibration motor is arranged at the upper end of the funnel structure (301).

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