An impeller and a stirring device

Abstract

The utility model discloses a kind of stirring paddle and stirring device, including fixed arm, stirring shaft and fastener, fixed arm is equipped with mounting groove and channel, mounting groove is opened in the surface of fixed arm along first direction and second direction perpendicular to first direction, stirring shaft is equipped with fixed part and stirring part, fixed part is suitable to be placed in mounting groove, fastener, its one of fixed arm and fixed part is penetrated, and with the other one of two screw connections, compared with the outer wall of stirring shaft and the outer wall of fixed arm are connected by fastener, torsional capacity improves, connection structure performance is good, stress is reduced, not easy to fatigue fracture, connection stiffness and stability are enough, centering is easy to guarantee. Stirring part is protruded in mounting groove along first direction, to be used for stirring. Channel is communicated with mounting groove, and is set to corresponding groove bottom corner portion of mounting groove, channel is opened in the surface of fixed arm along second direction, effectively reduce the friction and stress concentration phenomenon when fixed arm and stirring shaft assembly.

Description

Technical Field

[0001] This utility model relates to the field of powder processing, specifically to a stirring paddle and a stirring device. Background Technology

[0002] Aluminum-plastic composite bag packaging is a commonly used automated packaging method for powder products. The process includes: stretching the composite film, laser coding, and cutting it to a fixed length to form a continuous strip; the strip enters a forming machine, is folded into a bag tube, and then heat-sealed longitudinally; subsequently, bottom sealing, powder filling, and top sealing are completed, and finally, the bag is cut and separated into individual medicine bags.

[0003] While the screw-locking method, which directly presses the fixed arm against the outer surface of the stirring shaft to form the impeller, is simple in structure, it has several inherent defects under high-frequency, high-torque, and severe vibration conditions, making it difficult to meet the requirements for long-term stable operation: 1. Poor torsional resistance, prone to circumferential slippage (in the direction of rotation): loss of feeding accuracy; 2. Connection structure failure: repeated slippage will wear down the mating surfaces, reducing the screw preload, leading to increased slippage, creating a vicious cycle, and ultimately complete failure; 3. High stress concentration, prone to fatigue fracture; 4. Insufficient connection rigidity and stability: surface fixing has weak radial and axial constraint rigidity, making it prone to vibration and displacement under high loads; 5. Difficulty in ensuring centering: simple surface fixing cannot accurately guarantee the absolute coaxiality of the impeller and the stirring shaft. When eccentricity exists, the rotation of the impeller will generate additional unbalanced centrifugal force, exacerbating vibration and motor load.

[0004] Such load fluctuations can easily lead to decreased mixing stability and deterioration of uniformity, which in turn can cause material blockage, pulsation, or precision deviation, directly affecting packaging quality. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned defects or problems existing in the background art or to provide a material basis for overcoming the above-mentioned defects or problems existing in the background art, and to provide a stirring paddle and stirring device.

[0006] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0007] In Scheme 1 and its preferred embodiments, a stirring paddle includes...

[0008] A fixed arm is provided with a mounting groove and a channel. The mounting groove opens onto the surface of the fixed arm along a first direction and a second direction perpendicular to the first direction. The channel communicates with the mounting groove and is provided corresponding to the bottom corner of the mounting groove. The channel opens onto the surface of the fixed arm along the second direction.

[0009] A stirring shaft is provided with a fixing part and a stirring part, the fixing part being adapted to be placed in the mounting groove, and the stirring part extending out of the mounting groove along a first direction;

[0010] A fastener that passes through one of the fixed arm and the fixed part, and is threaded to the other of the two.

[0011] Option 2, based on Option 1, further includes an extension surface on the fixed arm. The extension surface is flush with or parallel to the plane where the opening of the mounting groove is located in the second direction. The roughness of the extension surface is less than or equal to Ra 0.8μm. The extension surface is connected to the bottom of the mounting groove.

[0012] Option 3, based on Option 1, has a roughness of the top edge of the mounting groove that is less than or equal to Ra 0.8μm.

[0013] Option 4, based on Option 1, features curved surface transitions between the outer walls of the fixed arm and between the outer walls of the stirring shaft.

[0014] Option 5, based on Option 1, includes a pressure-reducing groove in the stirring section. The pressure-reducing groove opens along the second direction and passes through the stirring shaft in a direction perpendicular to the first and second directions.

[0015] Option 6, based on Option 1, has a triangular cross-section perpendicular to the first direction, and the portion of the stirring part away from the fixed part is cone-shaped to converge into a point.

[0016] Option 7, a stirring device, including

[0017] A screw, adapted to rotate clockwise about a first axis parallel to the first direction.

[0018] And the stirring paddle as described in any one of Schemes 1 to 6, the stirring paddle surrounding the screw and adapted to reverse about a first axis.

[0019] Option 8, based on Option 7, includes a first driving component and a second driving component. The number of screws and stirring paddles is multiple and corresponds one-to-one. The first driving component drives each stirring paddle to rotate. The number of second driving components is the same as the number of screws and is set one-to-one. The second driving component drives the screws to rotate.

[0020] Option 9, based on Option 7, has a screw thread pitch of 20-25mm.

[0021] Option 10, based on Option 7, features a streamlined thread structure for the screw.

[0022] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0023] An agitator includes a fixed arm, an agitator shaft, and fasteners.

[0024] The fixed arm has a mounting groove and a channel. The mounting groove opens onto the surface of the fixed arm along a first direction and a second direction perpendicular to the first direction. The stirring shaft has a fixing part and a stirring part. The fixing part is adapted to be placed in the mounting groove. A fastener passes through one of the fixed arm and the fixing part and is threaded to the other. Compared with the outer wall of the stirring shaft being connected to the outer wall of the fixed arm by a fastener, the torsional resistance is improved, the connection structure has better performance, stress is reduced, fatigue fracture is less likely, the connection rigidity and stability are sufficient, and centering is easily guaranteed. The stirring part extends out of the mounting groove along the first direction for stirring.

[0025] The channel communicates with the mounting groove and is positioned corresponding to the bottom corner of the mounting groove. The channel opens along the second direction onto the surface of the fixed arm, effectively reducing friction and stress concentration during the assembly of the fixed arm and the stirring shaft, improving the smoothness of power transmission, and reducing additional torque caused by local resistance. Furthermore, the opening of the channel and mounting groove in the second direction facilitates machining, while the opening of the mounting groove in the first direction facilitates the extension of the stirring section. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a perspective view of the fixed arm in Embodiment 1;

[0028] Figure 2 This is a perspective view of the fixed arm in Embodiment 1 from another angle;

[0029] Figure 3 This is a perspective view of the stirring shaft in Example 1;

[0030] Figure 4 This is a front view of the stirring shaft in Example 1;

[0031] Figure 5 This is a partial schematic diagram of the stirring device in Example 1;

[0032] Figure 6 This is a perspective view of the screw in Example 1;

[0033] Figure 7 This is a perspective view of the stirring device in Example 1;

[0034] Explanation of key figure labels:

[0035] Agitator 10, fixed arm 1, fixed base 11; mounting base 12; mounting groove 121, top edge 1211; channel 122, first fixing hole 123; extension surface 124; agitator shaft 2; fixing part 21; second fixing hole 211; agitator part 22; pressure relief groove 221; screw 20; thread pitch 201; first drive component 30; second drive component 40; first direction 51; second direction 52; third direction 53; Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0037] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0038] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of the invention.

[0039] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0040] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0041] refer to Figures 1-7 A stirring device includes a screw 20, a stirring paddle 10, a first driving member 30, and a second driving member 40.

[0042] refer to Figure 6 , Figure 7 The screw 20 rotates clockwise around a first axis parallel to the first direction 51. The thread on the screw 20 spirals downwards along the first direction 51 and in the clockwise direction, where "down" refers to the direction near the free end of the screw 20, and "up" refers to the direction near the second drive member 40. The thread pitch 201 of the screw 20 is 20-25 mm. Preferably, the thread profile has a streamlined structure, that is, the thread profile is streamlined through a streamlined design. Streamlined design specifically refers to the optimization of the thread tooth shape, aiming to reduce its resistance when moving relative to the powder. Its main structural features include: a large fillet transition between the tooth crest and tooth flank (e.g., helix angle > 20°), and a continuous and smooth curved surface profile. Streamlining: Optimizing the geometry of the thread to make its profile continuous, smooth, and without sharp abrupt changes, similar to the form of fluid (such as water or air) flowing over the surface of an object with the least resistance (i.e., streamlined). Its fundamental purpose is to minimize the unnecessary resistance generated when the screw 20 rotates in the powder. The thread pitch 201 and profile treatment of screw 20 significantly improve the powder conveying capacity per turn, reduce motor speed and running resistance, thereby reducing power loss and powder adhesion, and ensuring feeding stability and loading accuracy.

[0043] There are multiple screws 20, and the number of second driving components 40 is the same as the number of screws 20, and they are set one by one. The second driving components 40 drive the screws 20 to rotate, and the output end of the second driving components 40 is fixedly connected to the screws 20.

[0044] refer to Figure 7 The number of agitator paddles 10 is multiple, and each paddle corresponds one-to-one with the screw 20, as shown in the reference. Figure 5 The first driving member 30 drives each stirring paddle 10 to rotate. In this embodiment, the output end of the first driving member 30 surrounds the output end of the second driving member 40. The first driving member 30 and the second driving member 40 can be rotary motors.

[0045] The agitator 10 surrounds the screw 20 and is adapted to rotate in reverse around the first axis. The agitator 10 is located on the side of the screw 20 near the second drive member 40. The function of the agitator 10 is not only to macroscopically agitate the powder in the hopper, promoting its overall flow and homogenization, but more importantly, to locally break up the "bridging" or "rat hole" phenomenon formed by the compression and friction of the powder near the starting end of the screw 20, thereby ensuring that the powder smoothly and stably enters the meshing section of the screw 20, creating the necessary conditions for accurate metering and feeding. The agitator 10 includes a fixed arm 1, an agitator shaft 2, and fasteners (not shown in the figure).

[0046] refer to Figure 1 , Figure 2 The fixed arm 1 includes a fixed seat 11 and a mounting seat 12. The fixed seat 11 is used to be fixedly connected to the output end of the second drive member 40. The fixed seat 11 is arc-shaped to provide clearance so that the fixed seat 11 can surround the screw 20 and reduce its resistance when it moves relative to the powder.

[0047] Mounting base 12 protrudes from fixing base 11 along the first direction 51. Mounting base 12 is also arc-shaped, and its maximum inner diameter and maximum outer diameter are the same as the corresponding dimensions of fixing base 11. Mounting base 12 is provided with mounting groove 121, channel 122, first fixing hole 123, and extension surface 124. Mounting groove 121 is located on the side of mounting base 12 opposite to fixing base 11. Mounting base 12 opens along the first direction 51 and a second direction 52 perpendicular to the first direction 51 on the surface of mounting base 12. In this embodiment, the mounting groove 121 is approximately square; the channel 122 communicates with the mounting groove 121 and is positioned at the corner of the bottom of the mounting groove 121 (wherein the bottom of the mounting groove 121 is perpendicular to the first direction 51 and located near the fixing seat 11). The channel 122 opens onto the surface of the fixing arm 1 along the second direction 52. In this embodiment, the cross-section of the channel 122 is approximately semi-circular; the opening of the channel 122 and the opening of the mounting groove 121 in the second direction 52 are located on the same plane. In the original design, the two bottom corners of the mounting groove 121 are right angles, forming significant stress concentration points. When the stirring shaft 2 transmits torque and bears combined bending and torsional loads, high stress is concentrated in this area, which easily leads to two problems: first, local material undergoes plastic deformation or micro-deformation, changing the geometry of the mating surface, increasing the assembly interference and frictional resistance; second, stress concentration leads to a decrease in the smoothness of the mating surface, introducing additional rough meshing, significantly increasing the motion resistance. By changing the right angle to a semi-circular channel 122, stress release and load optimization can be achieved. This design redistributes stress flow lines through a smooth transition region, eliminates stress peaks, and ensures uniform contact between the fixed arm 1 and the stirring shaft 2 on the entire mating surface, so that torque and moment are transmitted smoothly and additional frictional torque caused by local deformation is avoided.

[0048] The roughness of the top edge 1211 of the mounting groove 121 is less than or equal to Ra 0.8μm, which can be achieved by high-precision CNC machining and mirror polishing.

[0049] The extension surface 124 is flush with or parallel to the plane containing the opening of the mounting groove 121 in the second direction 52. The extension surface 124 is located between the mounting groove 121 and the fixed seat 11. The roughness of the extension surface 124 is less than or equal to Ra 0.8μm. The extension surface 124 is connected to the bottom of the mounting groove 121 and is at a certain distance from the fixed seat 11. The treatment of the top edge 1211 of the channel 122, the extension surface 124, and the mounting groove 121 effectively reduces the friction and stress concentration during the assembly of the fixed arm 1 and the stirring shaft 2, improves the smoothness of power transmission, and reduces the additional torque caused by local resistance.

[0050] The first fixing hole 123 extends along the second direction 52 and passes through the mounting base 12. The first fixing hole 123 communicates with the mounting groove 121. There can be multiple first fixing holes 123.

[0051] To improve the bending and torsional stiffness of the fixed arm 1, so that it can maintain its shape stability under the condition of uneven powder resistance distribution, and fundamentally avoid structural bending or breakage caused by excessive resistance, the size of the mounting base 12 can be increased, such as by increasing its arc length.

[0052] refer to Figure 3 , Figure 4 The stirring shaft 2 is provided with a fixing part 21 and a stirring part 22. The cross section of the fixing part 21 perpendicular to the first direction 51 is approximately trapezoidal. The fixing part 21 is adapted to be placed in the mounting groove 121. The fixing part 21 is provided with a second fixing hole 211 extending along the second direction 52. In this embodiment, the second fixing hole 211 is a threaded hole.

[0053] The stirring section 22 extends from the mounting groove 121 along the first direction 51. The cross-section of the stirring section 22 perpendicular to the first direction 51 is triangular, and the portion of the stirring section 22 facing away from the fixed section 21 is conical to converge at a point. This conical design significantly reduces propulsion resistance and power consumption, resulting in smoother powder flow and more uniform distribution. This structure effectively avoids stress concentration, improves fatigue and deformation resistance, and extends service life. It is particularly suitable for handling high-resistance powders. The conical surface is less prone to powder adhesion, making it easy to clean and reducing the risk of cross-contamination, thus meeting the hygiene requirements of the pharmaceutical and food industries. Furthermore, this design can break up powder arching, ensuring a continuous and stable supply from the discharge port, thereby improving the accuracy and consistency of packaging quantity, and enhancing the accuracy and quality of the final product's filling. In this embodiment, the cross-section of the stirring section 22 is a right-angled triangle.

[0054] The stirring section 22 is provided with a pressure-reducing groove 221. The pressure-reducing groove 221 opens along the second direction 52 and is away from the screw 20, and passes through the stirring shaft 2 in a direction perpendicular to the first direction 51 and the second direction 52. The pressure-reducing groove 221 can effectively destroy the compacted layer and adsorption layer formed by the powder at the bottom, reduce the actual contact area, and thus significantly reduce the adhesion force, compression reaction force and overall motion resistance of the powder to the stirring shaft 2. In addition, this pressure-reducing structure also helps to guide the flow of powder (the degree of compaction of the material in the hopper increases from the connection between the screw 20 and the second drive member 40 to the free end of the screw 20, and the powder can accumulate autonomously in the pressure-reducing groove 221. When the stirring paddle 10 in the pressure-reducing groove 221 area faces the powder medium, it can achieve a very small receiving area and a very high cutting efficiency. It can smoothly wedge into the powder, effectively destroy the "powder arch bridge" and accurately guide the material to the meshing area with the screw 20), avoid local stagnation and improve the uniformity of stirring.

[0055] The fastener passes through one of the fixing arm 1 and the fixing part 21 and is threaded to the other of the two. In this embodiment, the fastener is a screw, which passes through the first fixing hole 123 and is threaded to the second fixing hole 211.

[0056] The curved surface transitions between the outer walls of the fixed arm 1 and the stirring shaft 2 are optimized into continuous and smooth transitions. This can be achieved by systematically rounding all the outer edge edges of the fixed arm 1 and the stirring shaft 2. This design significantly improves the smoothness of the movement of the stirring paddle 10 in the powder medium, effectively reduces unnecessary collisions and friction, reduces local resistance peaks, and suppresses the adhesion and accumulation of powder on the paddle surface, thereby improving hydrodynamic performance.

[0057] During installation, place the fixing part 21 of the stirring shaft 2 into the mounting groove 121, align the first fixing hole 123 with the second fixing hole 211, and thread the fastener through the first fixing hole 123 and then into the second fixing hole 211. Secure the screw 20 to the output end of the second drive member 40, and secure the fixing seat 11 of the fixing arm 1 to the output end of the first drive member 30 (e.g., with screws) to complete the installation.

[0058] This mixing device significantly reduces mixing resistance and improves operational stability: by thickening the fixed arm 1 laterally and precision processing the mounting groove 121, its structural rigidity is greatly enhanced and the power transmission interface with the mixing shaft 2 is optimized, effectively resisting bending and torsional deformation caused by powder resistance; at the same time, by increasing the thread pitch 201 of the screw 20 and combining it with a streamlined thread profile design, the conveying capacity per revolution is increased while significantly reducing rotational resistance. The synergistic effect of these improvements fundamentally prevents the mixing paddle 10 from bending and breaking and the motor from overloading and shutting down, ensuring continuous and stable operation of the equipment.

[0059] Significantly improves powder flowability: The pressure reducing tank 221 design effectively breaks down the compacted powder layer, reduces the contact area and adhesion force; its external angles are optimized for fluid dynamics (curved surface transition) to reduce local resistance and powder accumulation during the mixing process; together with the increased thread pitch 201 of the screw 20 and the streamlined profile that improves the smoothness of conveying, the fluidization effect and conveying efficiency of the powder are enhanced, avoiding material accumulation on both sides and feeding pulsation, thereby ensuring the consistency of feeding accuracy and product loading in each channel.

[0060] Enhanced mechanical durability and reduced overall maintenance costs: Through multi-dimensional structural optimization of the feeding system of the agitator 10 and screw 20, the dynamic load and stress peak of the entire agitator 10 are systematically reduced. This not only extends the service life of key components such as the agitator 10, screw 20 and drive motor, but also reduces maintenance costs caused by downtime for cleaning and replacement of parts. The overall production efficiency and economic benefits of the equipment are significantly improved.

[0061] This stirring device can significantly reduce the load on the drive motor during high-load, multi-channel powder packaging processes, effectively prevent overload shutdowns, and ultimately ensure uniform feeding and accurate product filling.

[0062] Compared with the prior art, this embodiment has the following beneficial effects:

[0063] In one exemplary embodiment, a stirring paddle 10 includes a fixed arm 1, a stirring shaft 2, and fasteners.

[0064] The fixed arm 1 is provided with a mounting groove 121 and a channel 122. The mounting groove 121 opens onto the surface of the fixed arm 1 along a first direction 51 and a second direction 52 perpendicular to the first direction 51. The stirring shaft 2 is provided with a fixing part 21 and a stirring part 22. The fixing part 21 is adapted to be placed in the mounting groove 121. A fastener passes through one of the fixed arm 1 and the fixing part 21 and is threadedly connected to the other of the two. Compared with the outer wall of the stirring shaft 2 being connected to the outer wall of the fixed arm 1 by a fastener, the torsional resistance is improved, the connection structure performance is better, the stress is reduced, fatigue fracture is less likely, the connection rigidity and stability are sufficient, and the centering is easy to ensure. The stirring part 22 extends out of the mounting groove 121 along the first direction 51 for stirring.

[0065] The channel 122 communicates with the mounting groove 121 and is provided corresponding to the bottom corner of the mounting groove 121. The channel 122 opens along the second direction 52 onto the surface of the fixed arm 1, effectively reducing friction and stress concentration during the assembly of the fixed arm 1 and the stirring shaft 2, improving the smoothness of power transmission, and reducing the additional torque caused by local resistance. Furthermore, the opening of the channel 122 and the mounting groove 121 in the second direction 52 facilitates processing, while the opening of the mounting groove 121 in the first direction facilitates the extension of the stirring part 22.

[0066] In one exemplary embodiment, the fixed arm 1 is further provided with an extension surface 124, which is flush with or parallel to the plane where the opening of the mounting groove 121 is located in the second direction 52. The roughness of the extension surface 124 is less than or equal to Ra 0.8μm. The extension surface 124 is connected to the bottom of the mounting groove 121, which effectively reduces the friction and stress concentration phenomenon when the fixed arm 1 and the stirring shaft 2 are assembled, improves the smoothness of power transmission, and reduces the additional torque caused by local resistance.

[0067] In one exemplary embodiment, the roughness of the top edge 1211 of the mounting groove 121 is less than or equal to Ra 0.8μm, which effectively reduces the friction and stress concentration phenomenon when the fixed arm 1 and the stirring shaft 2 are assembled, improves the smoothness of power transmission, and reduces the additional torque caused by local resistance.

[0068] In one exemplary embodiment, the outer walls of the fixed arm 1 are curved and the outer walls of the stirring shaft 2 are curved. This design significantly improves the smoothness of the movement of the stirring paddle 10 in the powder medium, effectively reduces unnecessary collisions and friction, reduces local resistance peaks, and suppresses the adhesion and accumulation of powder on the paddle surface.

[0069] In one exemplary embodiment, the stirring section 22 is provided with a pressure-reducing groove 221. The pressure-reducing groove 221 opens along the second direction 52 and extends through the stirring shaft 2 in a direction perpendicular to the first direction 51 and the second direction 52. The pressure-reducing groove 221 can effectively break down the compacted layer and adsorption layer formed by the powder at the bottom of the impeller, reducing the actual contact area, thereby significantly reducing the adhesion force, compression reaction force, and overall motion resistance of the powder to the stirring impeller 10. In addition, this pressure-reducing structure also helps to guide the flow of powder, avoid local stagnation, and improve the uniformity of stirring.

[0070] In one exemplary embodiment, the stirring section 22 has a triangular cross-section perpendicular to the first direction 51, and the portion of the stirring section 22 away from the fixed section 21 is conical to converge at a point. This conical design significantly reduces propulsion resistance and power consumption, resulting in smoother powder flow and more uniform distribution. This structure effectively avoids stress concentration, improves fatigue and deformation resistance, and extends service life. It is particularly suitable for handling high-resistance powders. The conical surface is less prone to powder adhesion, making it easy to clean and reducing the risk of cross-contamination, thus meeting the hygiene requirements of the pharmaceutical and food industries. Furthermore, this design can break up powder arching, ensuring a continuous and stable supply from the discharge port, thereby improving the accuracy and consistency of packaging quantity, and enhancing the filling accuracy and packaging quality of the final product.

[0071] In one exemplary embodiment, a mixing device includes a screw 20 and the aforementioned mixing paddle 10. The screw 20 is adapted to rotate clockwise about a first axis parallel to a first direction 51 to feed material. The mixing paddle 10 surrounds the screw 20 and is adapted to rotate counterclockwise about the first axis to guide the powder to the area supplied to the screw 20, making full use of the annular space around the screw 20, and has the advantages of compact structure and small footprint.

[0072] In one exemplary embodiment, the system includes a first driving member 30 and a second driving member 40. There are multiple screws 20 and stirring paddles 10, which correspond one-to-one. The first driving member 30 drives each stirring paddle 10 to rotate, thereby reducing the number of first driving members 30 and reducing costs. The number of second driving members 40 is the same as the number of screws 20, and they are set one-to-one. The second driving members 40 drive the screws 20 to rotate. Since the feeding at each location is different, the screws 20 are driven by their own independent second driving members 40, so they will not interfere with each other.

[0073] In one exemplary embodiment, the thread pitch 201 of the screw 20 is 20-25mm, which significantly improves the powder conveying capacity per turn, reduces the motor speed and running resistance, thereby reducing power loss and powder adhesion, and ensuring feeding stability and loading accuracy.

[0074] In one exemplary embodiment, the screw 20 has a streamlined thread structure, which reduces the motor speed and running resistance, thereby reducing power loss and powder adhesion, and ensuring feeding stability and filling accuracy.

[0075] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A stirring paddle, characterized in that: include A fixed arm (1) is provided with a mounting groove (121) and a channel (122). The mounting groove (121) opens on the surface of the fixed arm (1) along a first direction (51) and a second direction (52) perpendicular to the first direction (51). The channel (122) communicates with the mounting groove (121) and is provided corresponding to the bottom corner of the mounting groove (121). The channel (122) opens on the surface of the fixed arm (1) along the second direction (52). A stirring shaft (2) is provided with a fixing part (21) and a stirring part (22). The fixing part (21) is adapted to be placed in the mounting groove (121), and the stirring part (22) extends out of the mounting groove (121) along a first direction (51). A fastener that passes through one of the fixed arm (1) and the fixed part (21) and is threaded to the other of the two.

2. The stirring paddle as described in claim 1, characterized in that: The fixed arm (1) is also provided with an extension surface (124), which is flush or parallel to the plane where the opening of the mounting groove (121) is located in the second direction (52). The roughness of the extension surface (124) is less than or equal to Ra 0.8μm, and the extension surface (124) is connected to the bottom of the mounting groove (121).

3. The stirring paddle as described in claim 1, characterized in that: The roughness of the top edge (1211) of the mounting groove (121) is less than or equal to Ra 0.8μm.

4. The stirring paddle as described in claim 1, characterized in that: The outer walls of the fixed arm (1) have curved transitions, and the outer walls of the stirring shaft (2) have curved transitions.

5. The stirring paddle as described in claim 1, characterized in that: The stirring part (22) is provided with a pressure relief groove (221), which opens along the second direction (52) and passes through the stirring shaft (2) in a direction perpendicular to the first direction (51) and the second direction (52).

6. The stirring paddle as described in claim 1, characterized in that: The stirring part (22) has a triangular cross section perpendicular to the first direction (51), and the part of the stirring part (22) away from the fixing part (21) is conical to converge into a point.

7. A stirring device, characterized in that: include The screw (20) is adapted to rotate clockwise about a first axis parallel to the first direction (51). And the stirring paddle (10) as described in any one of claims 1-6, the stirring paddle (10) surrounding the screw (20) and adapted to reverse about a first axis.

8. The stirring device as described in claim 7, characterized in that: It includes a first driving member (30) and a second driving member (40). There are multiple screws (20) and stirring paddles (10) that correspond one-to-one. The first driving member (30) drives each stirring paddle (10) to rotate. The number of second driving members (40) is the same as the number of screws (20) and they are set one-to-one. The second driving member (40) drives the screws (20) to rotate.

9. The stirring device as described in claim 7, characterized in that: The thread pitch (201) of the screw (20) is 20-25 mm.

10. The stirring device as described in claim 7, characterized in that: The screw (20) has a streamlined thread structure.

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