Static mixer

Abstract

The utility model discloses a static mixer which comprises spiral sheets and a powder pipe, a plurality of spiral sheets are respectively connected end to end in pairs to form a static mixing part, two adjacent spiral sheets are respectively connected in a crossed manner through corresponding bottoms and tops, and the static mixing part is connected in the powder pipe. The powder mixing device has the beneficial effects that the plurality of spiral sheets are respectively connected end to end in pairs to form the static mixing part, and the two adjacent spiral sheets are respectively connected in a crossed manner through the corresponding bottoms and tops, so that powder can smoothly enter the tops of the spiral sheets at the lower end from the bottoms of the spiral sheets at the upper end; the powder to be mixed begins to slide down from the top of the static mixing part and is sequentially mixed by each spiral piece connected with the static mixing part in the sliding-down process, rotary mixing is replaced, the problems of particle segregation and component segregation during powder mixing are prevented, the uniformity of the mixed powder is guaranteed, and then the quality of a printed finished product is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of powder mixing structures, in particular to a static mixer. Background Art

[0002] Selective laser melting metal 3D printing technology is a process of melting layers of metal powder to obtain a formed part. After each layer is melted, the melting platform descends, and new powder is spread over the layer to repeat the above melting process. This process is repeated to obtain a formed part.

[0003] The metal powder required for printing generally uses single powder and multiple powders. Multiple powders are mixed by multiple metal powders. The traditional mixing structure adopts rotary mixing. During the powder mixing process, centrifugal force will be generated, and the mixed powder will have particle size segregation, which will lead to component segregation and affect the quality of the printed product. Summary of the invention

[0004] The utility model aims to provide a static mixer to prevent the problems of particle diameter segregation and component segregation in mixed powder, ensure the uniformity of the mixed powder, and further ensure the quality of the printed product.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme.

[0006] A static mixer comprises a spiral blade and a powder tube. A plurality of spiral blades are connected end to end in pairs to form a static mixing part. Two adjacent spiral blades are cross-connected. The static mixing part is connected inside the powder tube.

[0007] The utility model adopts the above-mentioned scheme, forms a static mixing section by connecting several spiral pieces end to end in pairs, and cross-connects two adjacent spiral pieces through the corresponding bottom and top, so as to ensure that the powder can smoothly enter the top of the spiral piece at the lower end from the bottom of the upper spiral piece. When mixing the powder, the powder to be mixed starts to slide down from the top of the static mixing section, and is mixed in turn by each connected spiral piece during the sliding process, instead of rotating mixing, to prevent the generation of centrifugal force, so as to prevent the problems of particle diameter segregation and component segregation when mixing the powder, thereby ensuring the uniformity of the mixed powder and further ensuring the quality of the printed product.

[0008] Preferably, the spiral sheet is formed by multiple bends of a rectangular plate, and both sides of the spiral sheet are bent into a spiral shape.

[0009] In this way, the spiral sheet is bent from both sides of the rectangular plate into a spiral shape, so that when the powder slides down the spiral sheet, it will mix the powder from the top to the middle of the spiral sheet, and then mix the powder from the middle to the bottom. The powder will be mixed twice after passing through the static mixing part. n subdivision mixing, where n is the number of spiral slices.

[0010] Preferably, the rotation angle α of the spiral sheet is 35° to 65°, and the rotation angle of each spiral plate is the same.

[0011] Preferably, the rotation angle α of the spiral sheet is 35° to 65°, and the rotation angle of each spiral plate is different.

[0012] In this way, by adopting the above-mentioned rotation angle, it is convenient to make the rotation angle greater than the powder repose angle, so that the powder can fall smoothly, and the length of the powder tube can be controlled by controlling the rotation angle. The larger the rotation angle, the faster the powder mixing speed, and the longer the powder tube. Therefore, a suitable rotation angle is selected under the requirements of both satisfying the smooth falling of the powder and making the powder tube length meet the requirements of the on-site use environment.

[0013] Preferably, the static mixing section is formed by connecting 9 to 11 spiral blades.

[0014] In this way, by adopting 9 to 11 spiral sheets to connect and form the static mixing section, the powders can be mixed multiple times, thereby achieving uniform mixing of the powders.

[0015] Preferably, it further comprises a vibrator, wherein the vibrator comprises at least one, and the vibrator is connected to the outer wall of the powder tube.

[0016] In this way, by connecting the vibrator to the outer wall of the powder tube, it is convenient to vibrate the tube wall through the vibrator, so that when the rotation angle of the spiral blade is less than the repose angle, the powder can still fall smoothly to achieve powder mixing. When the rotation angle of the spiral blade is greater than the repose angle, the powder falling speed is increased to improve the mixing efficiency. A small amount of powder that slides to the top of the spiral blade can also be shaken off to ensure the mixing quality.

[0017] Preferably, a hopper is connected to the top of the powder tube.

[0018] In this way, by connecting a hopper to the top of the powder tube, it is convenient to place the powder to be mixed into the hopper.

[0019] Preferably, two adjacent spiral sheets are spot-welded to each other via a bottom center point and a top center point, and a crossing angle β between two adjacent spiral sheets is 85° to 95°.

[0020] In this way, the two adjacent spiral sheets are spot welded together through the bottom center point and the top center point, and the crossing angle β between the two adjacent spiral sheets is 85° to 95°, which is convenient for reducing the contact area between the two spiral sheets and allowing the powder to have sufficient sliding mixing range.

[0021] Preferably, both sides of the top and both sides of the bottom of the static mixing section are respectively connected to the inner wall of the powder tube by spot welding.

[0022] In this way, the top and bottom sides of the static mixing part are spot-welded to the inner wall of the powder tube respectively, reducing the contact area between the static mixing part and the powder tube, avoiding powder accumulation at the connection, and preventing the powder from diffusing and entering the spiral sheet through the powder tube.

[0023] The utility model has the following beneficial effects: a static mixing section is formed by connecting several spiral pieces end to end, and two adjacent spiral pieces are respectively cross-connected through the corresponding bottom and top, so that the powder can smoothly enter the top of the spiral piece at the lower end from the bottom of the upper spiral piece. When mixing powder, the powder to be mixed starts to slide down from the top of the static mixing section, and is mixed in sequence by each connected spiral piece during the sliding process, instead of rotating and mixing, so as to prevent the problems of particle diameter segregation and component segregation when mixing powder, ensure the uniformity of the mixed powder, and then ensure the quality of the printed product; and the top and bottom end points of the static mixing section are connected in the powder tube, so as to reduce the contact area between the static mixing section and the powder tube, avoid the accumulation of powder at the connection, and block the powder from spreading and entering the spiral piece through the powder tube. The vibrator vibrates the tube wall, so that the powder can still fall smoothly when the rotation angle of the spiral piece is less than the repose angle, so as to achieve powder mixing, and can also increase the powder falling speed and improve the mixing efficiency when the rotation angle of the spiral piece is greater than the repose angle, and can also shake off a small amount of powder that slides to the top of the spiral piece, so as to ensure the mixing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the appearance structure diagram of the utility model;

[0025] Figure 2 For this utility model Figure 1 Cross-sectional view of AA in the middle;

[0026] Figure 3 This is a structural diagram of the powder mixing structure when the spiral blade rotates at an angle of 60° in the utility model;

[0027] Figure 4 This is a structural diagram of the powder mixing structure when the spiral blade rotates at an angle of 30° in the utility model;

[0028] Figure 5 It is a structural diagram of the spiral blade in the utility model;

[0029] Figure 6 It is a partial structural diagram of the utility model. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments described.

[0031] The reference numerals in the drawings of the specification include: a powder tube 1 , a spiral blade 11 , a vibrator 12 , and a hopper 15 .

[0032] The words "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections or communication connections, whether direct or indirect.

[0033] Embodiment 1, as Figure 1 , Figure 2 and Figure 3 As shown; the present application provides a static mixer, including a spiral blade 11 and a powder tube 1, wherein a plurality of spiral blades 11 are connected end to end in pairs to form a static mixing section, wherein the bottom and top corresponding to two adjacent spiral blades 11 are cross-connected, and the static mixing section is connected inside the powder tube 1.

[0034] See also Figures 3 to 5 The spiral sheet 11 is formed by bending a rectangular plate, and both sides of the spiral sheet 11 are bent into a spiral shape. In this way, the spiral sheet 11 is bent into a spiral shape from both sides of the rectangular plate, so that when the powder slides down the spiral sheet 11, it will mix the powder from the top to the middle of the spiral sheet 11, and then mix the powder from the middle to the bottom. The powder will be mixed twice after passing through the static mixing part. n Sub-division mixing, where n is the number of spiral plates 11.

[0035] See also Figures 3 to 5 Specifically, the rotation angle α of the spiral sheet 11 can be 35º~45º, and the rotation angle of each spiral plate is the same or different. The rotation angle α of the spiral sheet 11 is 45º~55º, and the rotation angle of each spiral plate is the same or different. The rotation angle α of the spiral sheet 11 is 55º~65º, and the rotation angle of each spiral plate is the same or different. In this way, the above-mentioned rotation angle is adopted, so that the rotation angle is larger than the powder repose angle, so that the powder can fall smoothly, and the length of the powder tube 1 is controlled by controlling the rotation angle. The larger the rotation angle, the faster the powder mixing speed, and the longer the powder tube 1. Therefore, a suitable rotation angle is selected under the requirements of both satisfying the smooth falling of the powder and making the length of the powder tube 1 meet the requirements of the on-site use environment.

[0036] See also Figures 1 to 4The static mixing section is formed by connecting 9 to 11 spiral sheets 11. In this way, the powders are mixed multiple times by connecting 9 to 11 spiral sheets 11 to achieve uniform mixing of the powders.

[0037] See also Figure 1 , further comprising a vibrator 12, wherein the vibrator 12 comprises at least one vibrator 12, and the vibrator 12 is connected to the outer wall of the powder tube 1. In this way, by connecting the vibrator 12 to the outer wall of the powder tube 1, it is convenient to vibrate the tube wall through the vibrator 12, so that when the rotation angle of the spiral plate 11 is less than the repose angle, the powder can still fall smoothly to achieve powder mixing, and when the rotation angle of the spiral plate 11 is greater than the repose angle, the powder falling speed can be increased to improve the mixing efficiency, and a small amount of powder that slides to the top of the spiral plate 11 can be shaken off to ensure the mixing quality. Specifically, when one vibrator 12 is used, the vibrator 12 is connected to the middle of the powder tube 1. When two vibrators 12 are used, the vibrators 12 are respectively connected to 1 / 3 and 2 / 3 of the length of the powder tube 1. In this way, it is convenient for the powder tube 1 to be subjected to uniform force.

[0038] See also Figure 1 and Figure 2 The top of the powder tube 1 is connected with a hopper 15. Thus, by connecting the hopper 15 to the top of the powder tube 1, it is convenient to store the powder to be mixed through the hopper 15. The hopper 15 is connected to the top of the powder tube 1 by welding or threading.

[0039] See also Figures 3 to 6 , the two adjacent spiral sheets 11 are spot-welded to each other through the center point of the bottom and the center point of the top, and the intersection angle β between the two adjacent spiral sheets 11 is 85º to 95º. In this way, the two adjacent spiral sheets 11 are spot-welded to each other through the center point of the bottom and the center point of the top, and the intersection angle β between the two adjacent spiral sheets 11 is 85º to 95º, which is convenient for reducing the contact area between the two spiral sheets 11, so that the powder has enough sliding mixing range.

[0040] See also Figure 2 , the top and bottom sides of the static mixing part are spot-welded to the inner wall of the powder tube 1. In this way, the top and bottom sides of the static mixing part are spot-welded to the inner wall of the powder tube 1, respectively, to reduce the contact area between the static mixing part and the powder tube 1, to avoid accumulation of powder at the connection, and to prevent the powder from diffusing and entering the spiral sheet 11 through the powder tube 1.

[0041] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A static mixer, characterized in that: It comprises a spiral sheet (11) and a powder tube (1), wherein a plurality of spiral sheets (11) are connected end to end in pairs to form a static mixing section, and two adjacent spiral sheets (11) are cross-connected, and the static mixing section is connected inside the powder tube (1).

2. The static mixer according to claim 1, characterized in that The spiral sheet (11) is formed by bending a rectangular plate multiple times, and both sides of the spiral sheet (11) are bent into a spiral shape.

3. The static mixer according to claim 1, characterized in that The rotation angle α of the spiral plate (11) is 35° to 65°, and the rotation angle of each spiral plate is the same.

4. The static mixer according to claim 1, characterized in that The rotation angle α of the spiral plate (11) is 35° to 65°, and the rotation angle of each spiral plate is different.

5. The static mixer according to any one of claims 1 to 4, characterized in that: The static mixing section is formed by connecting 9 to 11 spiral sheets (11).

6. The static mixer according to any one of claims 1 to 4, characterized in that: It also comprises a vibrator (12), wherein the vibrator (12) comprises at least one vibrator (12), and the vibrator (12) is connected to the outer wall of the powder tube (1).

7. The static mixer according to any one of claims 1 to 4, characterized in that: The top of the powder tube (1) is connected to a hopper (15).

8. The static mixer according to any one of claims 1 to 4, characterized in that: The center points of the bottoms and the tops of the two adjacent spiral sheets (11) are connected by spot welding, and the crossing angle β between the two adjacent spiral sheets (11) is 85° to 95°.

9. The static mixer according to any one of claims 1 to 4, characterized in that: Both sides of the top and both sides of the bottom of the static mixing section are respectively connected to the inner wall of the powder tube (1) by spot welding.

Images