Powder mixing machine

Abstract

The utility model relates to the technical field of material mixing equipment, and provides a powder mixing machine which comprises a material mixing tank, a powder mixing device and a powder mixing device, a stirrer for stirring through high-speed rotation is arranged in the mixing tank; the bottom surface of the mixing tank is a circular-plate-shaped mixing tank bottom plate; the conical hopper is of a funnel structure; the top opening of the conical hopper is connected below the bottom plate of the mixing tank; a bottom opening of the conical hopper is a discharging opening; the top surfaces of the turntables are attached to the bottom surface of the bottom plate of the mixing tank; the turntable is in a circular ring shape; the turntables are sleeved in the form of concentric rings and can rotate relatively; a central rotating shaft is arranged at the circle center of the bottom surface of the mixing tank bottom plate, and the rotating disc located on the innermost side is rotationally connected with the central rotating shaft; a plurality of first through holes are formed in the bottom plate of the mixing tank from the inner ring to the outer ring; the turntables are arranged below the first through holes in each ring layer; a second through hole is formed in the position, corresponding to the first through hole, of the rotary disc. The first through holes and the corresponding second through holes are sector-shaped through holes which take the central rotating shaft as the circle center and have the same shape; after the turntable rotates, the first through holes and the corresponding second through holes can be staggered until the first through holes and the second through holes are completely shielded; the turntable bracket is fixedly connected to a top opening of the conical hopper; the top surface of the turntable bracket is propped against the bottom surface of each turntable; the rotating control devices are in transmission connection with the rotating discs in a one-to-one correspondence manner; and the rotation control device is suitable for driving the corresponding turntable to rotate and controlling the rotation angle. The powder mixing machine overcomes the defect that materials with different granularities are mixed unevenly due to high-speed stirring of an existing powder mixing machine.

Description

Technical Field

[0001] This utility model relates to the field of material mixing equipment technology, specifically to a powder mixing machine. Background Technology

[0002] In production activities, it is often necessary to mix materials of different compositions. Existing powder mixing machinery mostly achieves mixing of powdery or granular materials by using a continuously rotating agitator in a mixing tank. However, to improve mixing efficiency, the agitator speed needs to be increased. Simultaneously, the material volume also increases accordingly with the agitator's rotation speed. However, because high-speed rotating materials are subject to centrifugal force, if the particle size differences between different materials are relatively large, larger particles will accumulate in the outer space of the mixing tank, resulting in uneven mixing between the inner and outer layers of the tank. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defect of uneven mixing of materials of different particle sizes caused by high-speed stirring in existing powder mixing machinery.

[0004] To solve the above-mentioned technical problems, this application provides a powder mixing machine, comprising:

[0005] The mixing tank has a feed inlet at the top; the interior of the mixing tank is equipped with an agitator that rotates at high speed; the bottom of the mixing tank is a circular plate-shaped mixing tank bottom plate.

[0006] The cone-shaped hopper has a funnel-like structure; the top of the cone-shaped hopper is connected to the bottom plate of the mixing tank; the bottom of the cone-shaped hopper is the discharge port.

[0007] Multiple turntables, the top surface of which is in contact with the bottom surface of the mixing tank bottom plate; the turntables are annular; each turntable is nested in a concentric ring and can rotate relative to the other; a central rotating shaft is set at the center of the bottom surface of the mixing tank bottom plate, and the innermost turntable is rotatably connected to the central rotating shaft; the mixing tank bottom plate has multiple first through holes from the inner ring to the outer ring; each turntable is located below the first through hole in each ring; each turntable has a second through hole corresponding to the first through hole; the first through hole and the corresponding second through hole are both fan-shaped through holes with the central rotating shaft as the center and the same shape; when the turntable rotates, the first through hole and the corresponding second through hole can be misaligned until both are completely blocked;

[0008] A turntable support is fixedly connected to the top opening of the conical bucket; the top surface of the turntable support abuts against the bottom surface of each of the turntables.

[0009] Multiple rotation control devices are connected to each of the turntables in a one-to-one transmission manner; the rotation control devices are adapted to drive the corresponding turntables to rotate and control the rotation angle.

[0010] Furthermore, the turntable includes a disc body, an inner flange, and an outer flange; a second through hole is provided on the disc body; the inner flange is provided at the inner ring of the bottom surface of the disc body, and the outer flange is provided at the outer ring of the bottom surface of the disc body;

[0011] The inner flange of the innermost turntable forms a rotational engagement with the central rotating shaft;

[0012] For two adjacent turntables, the outer flange of the inner turntable and the inner flange of the outer turntable form a rotational fit.

[0013] Furthermore, the turntable support includes multiple support rods arranged radially; the outer end of each support rod is fixedly connected to the conical hopper, and the inner ends of each support rod intersect and are fixedly connected to each other; the inner ends of each support rod intersect at the center of the bottom plate of the mixing tank.

[0014] Multiple grooves are provided on the support rod; the grooves are suitable for accommodating the outer and inner flanges of each turntable; the top surface of the support rod is in contact with the bottom surface of each turntable body.

[0015] Furthermore, except for the innermost turntable, the outer and inner flanges of the other turntables form a rotational engagement with the sink.

[0016] Furthermore, the rotation control device includes a gear ring, a gear shaft, and a stepper motor; the gear ring is disposed on the bottom surface of the disk body, one end of the gear shaft meshes with the gear ring through a gear, and the other end of the gear shaft is connected to the stepper motor for transmission.

[0017] Furthermore, the toothed ring is a toothed segment disposed on the outer flange or the inner flange.

[0018] Furthermore, the support rod is a tube with an inner cavity that intersects with the settling trough; the gear shaft is disposed in the inner cavity and rotatably connected to the support rod; the outer end of the support rod extends out of the conical bucket and is fixedly connected to the stepper motor.

[0019] Furthermore, the number of support rods is no less than the number of turntables, and each support rod contains only one gear shaft.

[0020] Furthermore, the tooth segment is only located on the outer flange.

[0021] Furthermore, a recessed section is provided on the inner flange; for two adjacent turntables, the toothed section of the inner turntable is aligned with the recessed section of the outer turntable.

[0022] By adopting the above technical solution, this utility model has the following technical effects:

[0023] The powder mixing machine provided by this utility model, through the driving of a corresponding rotation control device, can achieve different rotation amplitudes for each turntable in the inner and outer rings. This results in different flow cross-sections in the channels between the first and second through holes of each turntable, allowing for the output of materials in different rings within the mixing tank at different proportions. Finally, the materials falling from different rings of the mixing tank are mixed again by the conical hopper and concentrated at the discharge port, producing a uniformly mixed finished product. This overcomes the defect of existing powder mixing machines where high-speed stirring leads to uneven mixing of materials of different particle sizes. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic front view of an embodiment of the present utility model;

[0026] Figure 2 This is a three-dimensional schematic diagram of the relevant structural components of the mixing tank bottom plate, turntable, and turntable support in an embodiment of this utility model.

[0027] Figure 3 This is a bottom view showing the relevant structural components of the mixing tank bottom plate, turntable, and turntable support in an embodiment of this utility model.

[0028] Figure 4 This is an exploded view showing the relevant structural components of the mixing tank bottom plate, turntable, and turntable support in an embodiment of this utility model.

[0029] Figure 5 This is a three-dimensional structural diagram of the third turntable in an embodiment of the present utility model;

[0030] Figure 6 This is a three-dimensional structural diagram of the turntable bracket according to an embodiment of the present utility model;

[0031] Figure 7 for Figure 3 Sectional view at point AA.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-First feed inlet, 2-Main motor, 3-Second feed inlet, 4-Agitator, 5-Mixing tank, 6-Motor connector, 7-Stepper motor, 8-Conical hopper, 9-Discharge port, 10-Mixing tank bottom plate, 11-First through hole, 12-Third turntable, 13-Turntable support, 14-First gear shaft, 15-Second turntable, 16-Second gear shaft, 17-First turntable, 18-Third gear shaft, 19-Central shaft, 20-Tooth section, 21-Outer flange, 22-Disc body, 23-Inner flange, 24-Second through hole, 25-Recessed section, 26-Support rod, 27-Settling trough, 28-Inner cavity, 29-Gear. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] It should be noted in the description of this utility model that the coordinate system used in describing the orientation is determined by the orientation of its main view, and the naming of the observation angle of the corresponding view is also based on this. Therefore, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] This embodiment provides a powder mixing machine. In one implementation, such as... Figures 1 to 7 As shown, it includes a mixing tank 5, a conical hopper 8, multiple turntables, a turntable support 13, and multiple rotation control devices.

[0039] The mixing tank 5 has a feed inlet at the top, such as a first feed inlet 1 and a second feed inlet 3. The mixing tank 5 is equipped with an agitator 4 that rotates at high speed; the main motor 2 driving the agitator 4 can also be located at the top of the mixing tank 5. The bottom of the mixing tank 5 is a circular plate-shaped mixing tank bottom plate 10.

[0040] The cone-shaped hopper 8 has a funnel structure; the top of the cone-shaped hopper 8 is connected to the bottom plate 10 of the mixing tank; the bottom of the cone-shaped hopper 8 is the discharge port 9.

[0041] The number of turntables can be set according to specific circumstances; the more turntables, the better the final effect, but the cost will increase accordingly. For clarity of the structure, this embodiment uses three turntables: a first turntable 17, a second turntable 15, and a third turntable 12. The specific structural arrangement for a larger number of turntables can be deduced similarly. The top surface of the turntable is in contact with the bottom surface of the mixing tank bottom plate 10. The turntable is annular; each turntable is nested within another concentric ring, allowing relative rotation. A central rotating shaft 19 is located at the center of the bottom surface of the mixing tank bottom plate 10, and the innermost turntable is rotatably connected to the central rotating shaft 19. The mixing tank bottom plate 10 has multiple first through holes 11 extending from the inner to the outer ring; alternatively, multiple first through holes 11 can be distributed circumferentially within the same ring. A turntable is provided below the first through hole 11 in each concentric circle; the turntable has a second through hole 24 corresponding to the first through hole 11. The first through hole 11 and the corresponding second through hole 24 are both fan-shaped through holes with the central pivot 19 as the center and the same shape. The fan-shaped through hole is similar in shape to the fan surface of a traditional folding fan, and is composed of two inner and outer arcs and two non-parallel sides; in order not to excessively weaken the strength of the plate, the rotation angle of the fan-shaped through hole used in this embodiment is relatively small, so that the non-parallelism of its arcs and sides is not obvious. The reason why a fan-shaped through-hole should be used even if it is not obvious is that when the turntable rotates, the first through-hole 11 and the corresponding second through-hole 24 can form two overlapping inner and outer arcs, while the two sides are misaligned relative to each other. In this way, the cross-section of the fan-shaped passage formed by the first through-hole 11 and the second through-hole 24 will not only decrease with the rotation of the turntable, but its cross-sectional area will also change proportionally with the rotation angle. Therefore, the powder flow rate of the turntable can be linearly controlled by controlling the rotation angle of the turntable. In order to achieve a completely closed effect, the first through-hole 11 and the corresponding second through-hole 24 should also be able to rotate to a state where both are completely blocked by the other plate.

[0042] The turntable support 13 is fixedly connected to the top opening of the conical bucket 8; the top surface of the turntable support 13 abuts against the bottom surface of each turntable, thereby supporting each turntable and preventing it from falling off.

[0043] The number of rotation control devices is the same as the number of turntables, and each rotation control device should be connected to the turntable in a one-to-one transmission manner; the rotation control device is adapted to drive the corresponding turntable to rotate and control the rotation angle.

[0044] The device operates as follows: First, the turntable is rotated using a rotary control device to close the channel between the first through-hole 11 and the second through-hole 24. Then, the powder to be mixed is injected into the mixing tank 5, and the agitator 4 is started for mixing. After the mixing time is reached, the degree of material mixing in different layers inside and outside the mixing tank 5 is measured. Based on this data, the required output flow rate of the material in different layers of the mixing tank 5 to achieve final uniform mixing is calculated. Of course, this uniformity measurement and calculation generally only needs to be performed once in the same batch of production and does not need to be repeated. Based on the previously obtained output volumes of materials in different concentric rings, the corresponding rotation control devices are then used to achieve different rotation amplitudes for each turntable in the inner and outer rings. This allows the channels between the first through-hole 11 and the second through-hole 24 corresponding to each turntable to form different sized flow cross sections that meet the requirements. If multiple first through-holes 11 and their second through-holes 24 are provided in the same concentric ring, the total flow volume should be calculated. This achieves different proportions of material output for different concentric rings in the mixing tank 5. The materials falling from different concentric rings in the mixing tank 5 are then mixed through the conical hopper 8 and concentrated at the discharge port 9, ultimately producing a uniformly mixed finished product. To achieve even better mixing results, a low-speed stirring device can also be added inside the conical hopper 8.

[0045] Based on the above embodiments, in a preferred embodiment, such as Figures 3 to 5 As shown, the turntable includes a disc body 22, an inner flange 23, and an outer flange 21; a second through hole 24 is provided on the disc body 22; the inner flange 23 is located on the inner ring of the bottom surface of the disc body 22, and the outer flange 21 is located on the outer ring of the bottom surface of the disc body 22. The inner flange 23 of the innermost turntable forms a rotational engagement with the central rotating shaft 19. For two adjacent turntables, the outer flange 21 of the inner turntable forms a rotational engagement with the inner flange 23 of the outer turntable.

[0046] The inner flange 23 and outer flange 21 have the following two advantages: First, the flanges enhance the overall strength of the turntable. A single disc 22 is too thin, and a large disc 22 is prone to deformation, which reduces its fit with the bottom plate 10 of the mixing tank. In severe cases, this can lead to unexpected powder leakage and cause the flow ratio control to fail. Second, the flanges improve the reliability and service life of the rotating connection. If the thin disc 22 rotates only through the contact between its inner and outer edges, the mating surface is too small, which can easily cause running jamming. The wear of the mating surface will also be high, and over time, the coaxiality will decrease. Especially for equipment with a large number of turntables, after the errors of each ring accumulate, the rotation coaxiality of the outermost turntable will become very poor, seriously affecting the proportional adjustment of the through-hole cross-section.

[0047] Based on the above embodiments, in a preferred embodiment, such as Figure 3 and 6 As shown, the turntable support 13 includes a plurality of radially distributed support rods 26; the outer end of each support rod 26 is fixedly connected to the conical hopper 8, and the inner ends of each support rod 26 intersect and are fixedly connected to each other; the inner ends of each support rod 26 converge at the center of the bottom plate 10 of the mixing tank. A plurality of recesses 27 are formed on the support rods 26; the recesses 27 are adapted to accommodate the outer flange 21 and inner flange 23 of each turntable; the top surface of the support rods 26 is in contact with the bottom surface of the disc body 22 of each turntable.

[0048] Compared to the scheme where the top surface of the support rod 26 does not have a recess 27 and directly abuts against the bottom surface of the outer flange 21 and the inner flange 23, this embodiment, by creating a recess 27, allows the top surface of the support rod 26 to fit against the bottom surface of the disc 22, thereby obtaining a larger contact area between the two. This reduces the possibility of flange shortening due to wear, resulting in a decrease in the height of the turntable and a decrease in the fit of the mixing tank bottom plate 10. It also avoids unexpected powder leakage paths between the turntable and the mixing tank bottom plate 10.

[0049] Based on the above embodiments, in a preferred embodiment, such as Figure 3 and 4 As shown, except for the innermost turntable, the outer flange 21 and inner flange 23 of the other turntables form a rotational engagement with the groove 27.

[0050] As mentioned above, after long-term rotation, the inner and outer ring turntables are prone to a decrease in coaxiality due to wear on the mating surfaces. This is especially true for the turntables located on the outer ring, where the accumulated errors from the various turntables relative to the inner ring result in very poor coaxiality, severely affecting the proportional adjustment of the through-hole cross-section. In this embodiment, the groove 27 forms a rotational fit with the flange, preventing the accumulated errors from significantly impacting the outer ring turntable and greatly improving the coaxiality reduction problem. Since the innermost turntable directly forms a rotational fit with the central shaft 19, it does not suffer from the error accumulation problem of the inner turntables, thus eliminating the need for the groove 27 to form a rotational fit with the innermost turntable.

[0051] Based on the above embodiments, in a preferred embodiment, the rotation control device includes a gear ring, a gear shaft, and a stepper motor 7; the gear ring is disposed on the bottom surface of the disk body 22, one end of the gear shaft meshes with the gear ring via a gear 29, and the other end of the gear shaft is connected to the stepper motor 7 for transmission. Gear transmission is a transmission form with relatively high motion accuracy, which is very suitable for precise control of the turntable angle. Therefore, the above-mentioned rotation control device has the advantages of high accuracy, simple structure, and reliable operation.

[0052] Based on the above embodiments, in a preferred embodiment, such as Figure 4 and 5 As shown, the toothed ring is a toothed segment 20 disposed on the outer flange 21 or the inner flange 23. The outer flange 21 and the inner flange 23 are already present and protrude from the bottom surface of the disk body 22. Therefore, by using this flange, it is possible to eliminate the need for an additional toothed ring, which can save manufacturing costs, simplify the component structure, and improve the overall structural compactness of the device. Since the rotation angle of the turntable is limited, it is not necessary to process the entire flange into a toothed ring; only a small section needs to be processed. Therefore, this flange can provide a base material for the toothed ring and also perform the original function of the flange. In order to better perform the original function of the flange, there should be a gap between the tooth root of the toothed segment 20 and the bottom surface of the disk body 22 to retain the flange portion below the tooth root.

[0053] Based on the above embodiments, in a preferred embodiment, such as Figure 1 , 6 As shown in Figure 7, the support rod 26 is a tube with an inner cavity 28, which intersects with the sink 27, allowing the flange of the turntable to enter the inner cavity 28. The gear shaft is disposed within the inner cavity 28 and is rotatably connected to the support rod 26. The outer end of the support rod 26 extends beyond the conical bucket 8 and is fixedly connected to the stepper motor 7 via the motor connector 6.

[0054] Both the gear shaft and the stepper motor 7 are bulky components. If they were located between the bottom plate 10 of the mixing tank and the discharge port 9, they would become obstructions to the flow of powder. However, by designing the support rod 26 as a tube with an inner cavity 28 and placing the gear shaft within it, the gear shaft can be hidden, thus no longer obstructing the flow of powder. Furthermore, by extending the support rod 26 and connecting it to the stepper motor 7, the stepper motor 7 can be placed outside the conical hopper 8, avoiding obstruction caused by its placement inside the conical hopper 8 and eliminating the need for explosion-proof treatment of the motor to prevent powder intrusion.

[0055] Based on the above embodiments, in a preferred embodiment, such as Figure 3 As shown, the number of support rods 26 is not less than the number of turntables, and each support rod 26 contains only one gear shaft. Figure 3 The first gear shaft 14, the second gear shaft 16, and the third gear shaft 18 are located within different support rods 26. This arrangement minimizes the cross-section of the support rods 26, preventing them from becoming obstacles that severely affect the falling powder. It also allows the corresponding stepper motors 7 to be arranged in a ring-like configuration. Compared to having all gear shafts crammed together in one tube, this embodiment facilitates the installation, maintenance, and even heat dissipation of the stepper motors 7, and avoids the need for additional transmission devices between the motors and gear shafts due to insufficient space for component arrangement.

[0056] Based on the above embodiments, in a preferred embodiment, such as Figure 5 As shown, the tooth segment 20 is only provided on the outer flange 21. This arrangement can provide a greater rotational torque for the turntable because the gear shaft can obtain a larger lever arm on the outer flange 21 than on the inner flange 23, thus obtaining a stronger rotational torque with the same gear shaft output.

[0057] Based on the above embodiments, in a preferred embodiment, such as Figure 4 , 5 As shown in Figure 7, a recessed section 25 is provided on the inner flange 23; for two adjacent turntables, the tooth section 20 of the inner turntable is aligned with the recessed section 25 of the outer turntable. This is because the gear 29 is generally wider than the gear ring, i.e. Figure 7 As shown in the figure. In order to achieve rotational engagement, the outer flange 21 and inner flange 23 of the adjacent turntable must be in close contact with each other. In this case, when the tooth section 20 is set on the outer flange 21, the inner flange 23 at the adjacent position may obstruct the gear 29. Therefore, it is preferable to set a recessed section 25 on the inner flange 23 at that position.

[0058] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A powder mixing machine, characterized in that, include: The mixing tank (5) has a feed inlet at the top; the mixing tank (5) is equipped with a stirrer (4) that rotates at high speed; the bottom of the mixing tank (5) is a circular plate-shaped mixing tank bottom plate (10). The cone-shaped hopper (8) has a funnel structure; the top of the cone-shaped hopper (8) is connected to the bottom plate (10) of the mixing tank; the bottom of the cone-shaped hopper (8) is the discharge port (9); Multiple turntables are attached to the bottom surface of the mixing tank bottom plate (10) with their top surfaces in contact. The turntables are in the shape of rings. Each turntable is nested in a concentric ring and can rotate relative to the other. A central rotating shaft (19) is provided at the center of the bottom surface of the mixing tank bottom plate (10), and the innermost turntable is rotatably connected to the central rotating shaft (19). The mixing tank bottom plate (10) has multiple first through holes (11) from the inner ring to the outer ring. Each turntable is provided below the first through hole (11) of each ring. The turntable has a second through hole (24) corresponding to the first through hole (11). The first through hole (11) and the corresponding second through hole (24) are both fan-shaped through holes with the central rotating shaft (19) as the center and the same shape. When the turntable rotates, the first through hole (11) and the corresponding second through hole (24) can be misaligned until both are completely blocked. A turntable support (13) is fixedly connected to the top opening of the conical bucket (8); the top surface of the turntable support (13) abuts against the bottom surface of each of the turntables; Multiple rotation control devices are connected to each of the turntables in a one-to-one transmission manner; the rotation control devices are adapted to drive the corresponding turntables to rotate and control the rotation angle.

2. The powder mixing machine according to claim 1, characterized in that, The turntable includes a disc body (22), an inner flange (23) and an outer flange (21); a second through hole (24) is provided on the disc body (22); the inner flange (23) is provided on the inner ring of the bottom surface of the disc body (22), and the outer flange (21) is provided on the outer ring of the bottom surface of the disc body (22); The inner flange (23) of the innermost turntable is rotated with the central shaft (19); for two adjacent turntables, the outer flange (21) of the inner turntable is rotated with the inner flange (23) of the outer turntable.

3. The powder mixing machine according to claim 2, characterized in that, The turntable support (13) includes multiple support rods (26) arranged radially; the outer end of each support rod (26) is fixedly connected to the conical bucket (8), and the inner ends of each support rod (26) intersect and are fixedly connected to each other; the inner ends of each support rod (26) intersect at the center of the bottom plate (10) of the mixing tank. Multiple grooves (27) are provided on the support rod (26); the grooves (27) are suitable for accommodating the outer flange (21) and inner flange (23) of each of the turntables; the top surface of the support rod (26) is in contact with the bottom surface of the disc body (22) of each of the turntables.

4. The powder mixing machine according to claim 3, characterized in that, Except for the innermost turntable, the outer flange (21) and inner flange (23) of the other turntables form a rotational fit with the sink (27).

5. The powder mixing machine according to claim 3 or 4, characterized in that, The rotation control device includes a gear ring, a gear shaft and a stepper motor (7); the gear ring is set on the bottom surface of the disk body (22), one end of the gear shaft meshes with the gear ring through a gear (29), and the other end of the gear shaft is connected to the stepper motor (7) for transmission.

6. The powder mixing machine according to claim 5, characterized in that, The toothed ring is a tooth segment (20) disposed on the outer flange (21) or the inner flange (23).

7. The powder mixing machine according to claim 6, characterized in that, The support rod (26) is a tube with an inner cavity (28) that intersects with the settling trough (27); the gear shaft is set inside the inner cavity (28) and rotatably connected to the support rod (26); the outer end of the support rod (26) extends out of the conical bucket (8) and is fixedly connected to the stepper motor (7).

8. The powder mixing machine according to claim 7, characterized in that, The number of support rods (26) is not less than the number of turntables, and only one gear shaft is provided in each support rod (26).

9. The powder mixing machine according to claim 6, characterized in that, The tooth segment (20) is only located on the outer flange (21).

10. The powder mixing machine according to claim 9, characterized in that, A recessed section (25) is provided on the inner flange (23); for two adjacent turntables, the toothed section (20) of the inner turntable is aligned with the recessed section (25) of the outer turntable.

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