A stirring device and a stirring method

Abstract

This invention discloses a stirring device and a stirring method, including a stirring tank. The stirring tank contains a stirring device and includes a tank body, an inlet and an outlet connected to the side of the tank body. The stirring device includes a main shaft motor mounted on the top of the tank body and at least two auxiliary shaft motors arranged annularly around the central axis of the main shaft motor. The output end of each auxiliary shaft motor has a secondary rotating shaft penetrating into the inner cavity of the tank body. The auxiliary rotating shaft has spirally distributed helical blades on the outer wall of the inner cavity section of the tank body. This invention employs a structure where the crossbars can oscillate due to the helical blades, and multiple crossbars oscillate in a coordinated manner, enabling multiple crossbars to achieve a simultaneous rising and falling stirring effect. This increases the tumbling area of ​​the crossbars on the material, further enhancing the mixing effect of the crossbars.

Description

Technical Field

[0001] This invention belongs to the technical field of stirring devices, specifically a stirring device and a stirring method. Background Technology

[0002] A stirring device is a widely used piece of equipment in industries such as chemical, pharmaceutical, food, and water treatment. It is mainly used for mixing, stirring, and dissolving various materials. Its working principle is to make the materials circulate and rotate in the container through the stirrer, thereby achieving uniform mixing and accelerating the reaction.

[0003] Using a single stirring shaft in the stirring device may result in the following drawbacks:

[0004] Weak mixing effect: Compared with multiple mixing shafts, a single mixing shaft is less able to generate more complex flow patterns, which reduces the mixing efficiency of materials during the mixing process and easily leads to local uneven mixing.

[0005] Difficult to adapt to different materials: Different materials have different physical properties, such as viscosity and density; a single stirring shaft cannot perform different stirring methods and speeds according to the characteristics of the materials.

[0006] Low equipment stability: Multiple stirring shafts can share the load of a single stirring shaft, but a single stirring shaft is more likely to increase the failure rate of the equipment.

[0007] However, using multiple stirring shafts in a stirring device may result in low overall mixing efficiency, while some areas may be mixed quickly but the overall mixing efficiency is low, and the composition of different areas after mixing is not uniform.

[0008] Therefore, in order to improve the mixing efficiency of the stirring shaft for materials, and considering the different defects that arise when a single stirring shaft and multiple stirring shafts face different mixing purposes, a mixing device that can quickly mix materials without causing inconsistent mixing ratios in different areas is proposed. Summary of the Invention

[0009] The purpose of this invention is to solve the technical problem that multiple stirring rollers can easily lead to different material compositions between rollers and low mixing efficiency of a single stirring roller. By combining the structural characteristics of single stirring rollers and multiple stirring rollers, a stirring device and stirring method are provided.

[0010] The technical solution adopted in this invention is as follows:

[0011] A mixing device includes a mixing tank, wherein the mixing tank is provided with a mixing device, and the mixing tank includes a tank body, an inlet and an outlet connected to the side of the tank body;

[0012] The stirring device includes a main shaft motor installed on the top of the tank shell and at least two auxiliary shaft motors arranged in a ring around the central axis of the main shaft motor.

[0013] The output end of the secondary shaft motor is provided with a secondary rotating shaft that extends through the inner cavity of the tank. The secondary rotating shaft has spirally distributed spiral blades on the outer wall of the inner cavity section of the tank.

[0014] The output end of the main shaft motor is provided with a main rotating shaft that extends into the inner cavity of the tank. The main rotating shaft is provided with at least one set of vertical rotating frames in the inner cavity section of the tank. The inner cavity of the main rotating shaft is hollow.

[0015] The vertical rotating frame includes multiple crossbars equal in number to the secondary shaft motor, flipping blades mounted on the crossbars, and sliding collars that slide within the main rotating shaft cavity. All the crossbars within the vertical rotating frame are rotatably connected to the sliding collars, and the ends of the crossbars furthest from the main rotating shaft are vertically flipped in conjunction with the helical blades.

[0016] The vertical rotating frame also includes a partition that separates the inner cavity of the main rotating shaft, a second spring connecting the partition and the sliding collar, and the partition in the vertical rotating frame is located above the sliding collar.

[0017] The crossbar includes a horizontal section located outside the main rotating shaft and a vertical section located inside the main rotating shaft cavity. The side wall of the main rotating shaft has a side hole that allows the crossbar to extend through and into the main rotating shaft cavity. The horizontal width of the side hole is equal to the horizontal width of the horizontal section of the crossbar, and the vertical width of the side hole is greater than the vertical width of the horizontal section of the crossbar.

[0018] The vertical section of the crossbar is rotatably connected to a sliding collar at one end away from the horizontal section. A first spring is connected between the horizontal section of the crossbar and the main shaft housing at the side closest to the vertical section. A rotating ring is fitted on the horizontal section of the crossbar away from the vertical section, and the rotating ring abuts against the spiral blade.

[0019] The flipping blade is located in the area between the rotating ring and the first spring on the horizontal section of the crossbar, and the flipping blade is spirally arranged around the central axis of the horizontal section of the crossbar.

[0020] The mixing tank also includes an upper hollow interlayer disposed at the top of the tank body and a lower hollow interlayer disposed at the bottom of the tank body. The top of the lower hollow interlayer is provided with a sliding hole for insertion and rotation with the main rotating shaft.

[0021] The auxiliary shaft motor is mounted on the same plane as the main shaft motor at the top of the tank, and the output ends of both the main shaft motor and the auxiliary shaft motor pass through the hollow interlayer.

[0022] The feed inlet is located at the connection between the tank body and the upper hollow interlayer, and the discharge outlet is located at the connection between the tank body and the lower hollow interlayer.

[0023] A stirring method, applied to the aforementioned stirring apparatus, includes a current monitoring unit for monitoring the current of an auxiliary shaft motor.

[0024] It also includes the following steps:

[0025] S1: Open the feed port and close the discharge port. Then add the raw materials into the inner cavity of the tank through the feed port. Turn on the main shaft motor to drive the main shaft to drive multiple vertical rotating frames to mix the raw materials evenly. Turn off the main shaft motor.

[0026] S2: Turn on the secondary shaft motor so that the secondary shaft drives the spiral blades to start stirring. When multiple secondary shafts are stirring, they all maintain the same and constant speed.

[0027] S3: Disconnect the auxiliary shaft motor and connect the main shaft motor to perform mixing; disconnect the main shaft motor again after the preset mixing time.

[0028] The current monitoring unit monitors the current value of each sub-shaft motor during stirring, obtains the monitoring current value of each motor, and compares whether it is within the preset value range.

[0029] If the monitored current value of any of the sub-shaft motors reaches the preset value range, and the monitored current value of any of the sub-shaft motors does not reach the preset value range, then stop executing step S2 and start executing step S3.

[0030] After the preset mixing time is reached, stop executing step S3 and start executing step S2.

[0031] Repeat steps S2-S3 until the current values ​​of all secondary shaft motors reach the preset range, then disconnect the secondary shaft motors from the main shaft motor and end the execution steps.

[0032] In step S1, the stirring time of the main shaft motor is 20-30 minutes.

[0033] In step S3, the preset mixing time for the main spindle motor is 10-15 minutes.

[0034] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0035] 1. In this invention, a distributed arrangement of main shaft and auxiliary shaft is adopted. When the main shaft rotates, it drives the material to rotate as a whole inside the tank, thereby making the material mix quickly and evenly distributed in various areas of the tank. Then, the auxiliary shaft drives the rotation of the spiral blades, so that the material is turned over from bottom to top in the spiral blade area, accelerating the local mixing of the material, and finally achieving the purpose of uniform mixing of the material.

[0036] 2. In this invention, a structure is adopted in which the crossbar is driven by the spiral blade to swing. When the crossbar is driven to rotate by the main shaft, it can also be driven to flip in the vertical direction when it passes the spiral blade, thereby increasing the flipping area of ​​the crossbar on the material and further increasing the mixing effect of the crossbar.

[0037] 3. In this invention, a multi-bar linkage swing mechanism is adopted, wherein multiple bars in a single vertical rotating frame are limited by a sliding collar and can synchronously generate vertical up-and-down swing, so that any one bar in the vertical rotating frame can drive the other bars to swing, so that multiple bars can achieve a stirring effect of rising and falling together.

[0038] 4. In this invention, the viscosity of the colloid of the stirred material can be obtained by the energizing coefficient of each auxiliary shaft motor, without the need for mid-process sampling; the viscosity of the silica gel can be adjusted more promptly, and the main shaft and auxiliary shaft work together to stir, which can save electricity and better adjust the stirring viscosity. Attached Figure Description

[0039] Figure 1 This is a simplified schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the vertical cross-sectional structure in this invention;

[0041] Figure 3 This is a schematic diagram of the internal structure of the tank in this invention;

[0042] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the tank in this invention;

[0043] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0044] Figure 6 For the present invention Figure 4 Enlarged structural diagram at point B.

[0045] Marked in the image:

[0046] 1. Mixing tank; 11. Inlet; 12. Outlet; 13. Tank body; 14. Upper hollow jacket; 15. Lower hollow jacket; 16. Sliding hole;

[0047] 2. Stirring device; 21. Main shaft motor; 211. Main rotating shaft; 212. Crossbar; 213. Rotating ring; 214. Tilting blade; 215. First spring; 216. Sliding collar; 217. Second spring; 218. Partition plate; 219. Side hole;

[0048] 22. Secondary shaft motor; 221. Secondary shaft; 222. Helical blade. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0050] Example 1, refer to Figure 1-6 A stirring device includes a stirring tank 1, a stirring device 2 is installed inside the stirring tank 1, and the stirring tank 1 includes a tank body 13, a feed inlet 11 and a discharge outlet 12 connected to the side of the tank body 13.

[0051] The inlet 11 and outlet 12 are used for the material to enter and exit the tank 13, respectively. Both the inlet 11 and outlet 12 are equipped with valve structures on the outside to seal the inner cavity of the tank 13 during stirring.

[0052] The stirring device 2 includes a main shaft motor 21 mounted on the top of the outer shell of the tank 13 and at least two auxiliary shaft motors 22 arranged in a ring around the central axis of the main shaft motor 21;

[0053] Among them, the distance between at least two secondary shaft motors 22 and the main shaft motor 21 is equal, and the spacing between the central shafts of any two adjacent secondary shaft motors 22 is also the same, so that at least two secondary shaft motors 22 are distributed in a ring at equal intervals around the central shaft of the main shaft motor 21.

[0054] The output end of the secondary shaft motor 22 is provided with a secondary rotating shaft 221 that extends through the inner cavity of the tank body 13. The secondary rotating shaft 221 has spirally distributed spiral blades 222 on the outer wall of the inner cavity section of the tank body 13.

[0055] Among them, the spiral blades 222 are spirally distributed around the central axis of the auxiliary rotating shaft 221 inside the tank 13, so that multiple auxiliary shaft motors 22 can drive the spiral blades 222 to stir the material in a local area inside the tank 13.

[0056] The output end of the main spindle motor 21 is provided with a main rotating shaft 211 that extends into the inner cavity of the tank body 13. The main rotating shaft 211 is provided with at least one set of vertical rotating frames in the inner cavity section of the tank body 13. The inner cavity of the main rotating shaft 211 is hollow.

[0057] Among them, the main shaft motor 21 is used to drive the vertical rotating frame on the main rotating shaft 211 to rotate around the central axis of the main rotating shaft 211, so that the material inside the tank 13 is pushed as a whole and mixed.

[0058] The vertical rotating frame includes multiple crossbars 212 equal in number to the secondary shaft motor 22, flipping blades 214 mounted on the crossbars 212, and a sliding collar 216 that slides within the cavity of the main rotating shaft 211. The multiple crossbars 212 within the vertical rotating frame are rotatably connected to the sliding collar 216, and the ends of the crossbars 212 away from the main rotating shaft 211 are vertically flipped in cooperation with the helical blades 222.

[0059] When the main rotating shaft 211 rotates, it can drive multiple horizontal bars 212 in the vertical rotating frame to rotate and stir around the main rotating shaft 211 as the central axis. At the same time, the end of the horizontal bar 212 away from the main rotating shaft 211 is driven by the spiral blade 222, which can produce vertical oscillation. This causes the horizontal bar 212 to oscillate irregularly in the vertical direction while rotating around the central axis of the main rotating shaft 211, thereby increasing the stirring range of the horizontal bar 212, that is, increasing the stirring range and stirring effect of the vertical rotating frame.

[0060] Specifically, the vertical rotating frame also includes a partition 218 that forms a partition in the inner cavity of the main rotating shaft 211, and a second spring 217 connecting the partition 218 and the sliding collar 216. The partition 218 in the vertical rotating frame is located above the sliding collar 216.

[0061] Among them, the partition 218 is used to form a multi-section closed cavity structure in the inner cavity of the main rotating shaft 211, which can increase the strength of the main rotating shaft 211 compared with the hollow structure. On the other hand, it is used to pull the partition 216 through the second spring 217 so that the crossbar 212 can be kept horizontal in the tank 13 in the initial state.

[0062] The crossbar 212 includes a horizontal section disposed on the outside of the main rotating shaft 211 and a vertical section disposed in the inner cavity of the main rotating shaft 211. The side wall of the main rotating shaft 211 is provided with a side hole 219 that cooperates with the crossbar 212 to extend through into the inner cavity of the main rotating shaft 211. The horizontal width of the side hole 219 is equal to the horizontal width of the horizontal section of the crossbar 212, and the vertical width of the side hole 219 is greater than the vertical width of the horizontal section of the crossbar 212.

[0063] The side hole 219 opened on the side wall of the main rotating shaft 211 allows the main rotating shaft 211 to fix and limit the horizontal bar 212 in the horizontal direction, preventing the horizontal bar 212 from displacing relative to the main rotating shaft 211 in the horizontal direction. At the same time, the main rotating shaft 211 allows the horizontal bar 212 to slide and limit the vertical direction, allowing the end of the horizontal bar 212 away from the main rotating shaft 211 to swing up and down, increasing the stirring area of ​​the horizontal bar 212.

[0064] The vertical section of the crossbar 212 away from the horizontal section is rotatably connected to the sliding collar 216. The horizontal section of the crossbar 212 near the vertical section is connected to the outer shell of the main rotating shaft 211 by a first spring 215. The horizontal section of the crossbar 212 away from the vertical section is fitted with a rotating ring 213, which abuts against the spiral blade 222.

[0065] In this design, multiple crossbars 212 in the same vertical rotating frame are simultaneously connected to the same sliding collar 216. This allows any one of the crossbars 212 to swing up and down when it is abutted by the spiral blade 222. By driving the sliding collar 216 to slide within the main rotating shaft 211, the remaining crossbars 212 will all produce the same swinging effect as the first crossbar 212, thus achieving the function of synchronously controlling the swinging and stirring of multiple crossbars 212. At the same time, the rotating ring 213 is set to reduce the friction between the crossbar 212 and the spiral blade 222 when the horizontal section of the crossbar 212 passes the spiral blade 222 through the rotation of the rotating ring 213 and the crossbar 212.

[0066] The flipping blade 214 is located in the area between the rotating ring 213 and the first spring 215 on the horizontal section of the crossbar 212. The flipping blade 214 is spirally arranged around the central axis of the horizontal section of the crossbar 212.

[0067] The rotating blade 214 is used to drive and stir the material during the rotation and oscillation of the crossbar 212, so that the material is mixed between multiple spiral blades 222.

[0068] Furthermore, the mixing tank 1 also includes an upper hollow jacket 14 disposed at the top of the tank body 13 and a lower hollow jacket 15 disposed at the bottom of the tank body 13. The top of the lower hollow jacket 15 is provided with a sliding hole 16 for inserting and rotating with the main rotating shaft 211.

[0069] The upper hollow interlayer 14 and the lower hollow interlayer 15 are respectively used for heat insulation of the main shaft motor 21 and the auxiliary shaft motor 22, as well as for heat insulation between the bottom of the tank body 13 and the support foot. The sliding hole 16 is used to limit the main shaft 211 and prevent misalignment when the main shaft 211 rotates.

[0070] The auxiliary shaft motor 22 is mounted on the same plane as the main shaft motor 21 at the top of the tank body 13. The output ends of both the main shaft motor 21 and the auxiliary shaft motor 22 pass through the upper hollow interlayer 14. The feed inlet 11 is located at the connection between the tank body 13 and the upper hollow interlayer 14, and the discharge outlet 12 is located at the connection between the tank body 13 and the lower hollow interlayer 15.

[0071] Example 2: A stirring method applied to a stirring device, including a current monitoring unit for monitoring the current of an auxiliary shaft motor;

[0072] It also includes the following steps:

[0073] S1: Open the feed port 11 and close the discharge port 12. Then add the raw material into the inner cavity of the tank 13 through the feed port 11. Turn on the main shaft motor 21 so that the main shaft 211 drives multiple vertical rotating frames to mix the raw material evenly for 20 minutes. Then turn off the main shaft motor 21.

[0074] S2: Turn on the secondary shaft motor 22, so that the secondary shaft 221 drives the spiral blade 222 to start stirring. When multiple secondary shafts 221 are stirring, they all maintain the same and constant speed.

[0075] S3: Disconnect the secondary shaft motor 22 and connect the main shaft motor 21 to perform mixing and stirring; disconnect the main shaft motor 21 again after 10 minutes;

[0076] The current monitoring unit monitors the stirring current value of each secondary shaft motor 22, obtains the monitoring current value of each motor, and compares whether it is within the preset value range.

[0077] If the monitored current value of any of the sub-shaft motors 22 reaches the preset value range, and the monitored current value of any of the sub-shaft motors 22 does not reach the preset value range, then step S2 will be stopped and step S3 will be started.

[0078] After the preset mixing time is reached, stop executing step S3 and start executing step S2.

[0079] Repeat steps S2-S3 until the current values ​​of all sub-shaft motors 22 reach the preset range, then disconnect the sub-shaft motors 22 from the main spindle motor 21 and end the execution steps.

[0080] Example 3: A stirring method applied to a stirring device, including a current monitoring unit for monitoring the current of an auxiliary shaft motor;

[0081] It also includes the following steps:

[0082] S1: Open the feed port 11 and close the discharge port 12. Then add the raw material into the inner cavity of the tank 13 through the feed port 11. Turn on the main shaft motor 21 so that the main shaft 211 drives multiple vertical rotating frames to mix the raw material evenly for 30 minutes. Then turn off the main shaft motor 21.

[0083] S2: Turn on the secondary shaft motor 22, so that the secondary shaft 221 drives the spiral blade 222 to start stirring. When multiple secondary shafts 221 are stirring, they all maintain the same and constant speed.

[0084] S3: Disconnect the auxiliary shaft motor 22 and connect the main shaft motor 21 to perform mixing and stirring; disconnect the main shaft motor 21 again after 15 minutes;

[0085] The current monitoring unit monitors the stirring current value of each secondary shaft motor 22, obtains the monitoring current value of each motor, and compares whether it is within the preset value range.

[0086] If the monitored current value of any of the sub-shaft motors 22 reaches the preset value range, and the monitored current value of any of the sub-shaft motors 22 does not reach the preset value range, then step S2 will be stopped and step S3 will be started.

[0087] After the preset mixing time is reached, stop executing step S3 and start executing step S2.

[0088] Repeat steps S2-S3 until the current values ​​of all sub-shaft motors 22 reach the preset range, then disconnect the sub-shaft motors 22 from the main spindle motor 21 and end the execution steps.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stirring device, comprising a stirring tank (1), characterized in that: The mixing tank (1) is equipped with a stirring device (2). The mixing tank (1) includes a tank body (13), a feed inlet (11) and a discharge outlet (12) connected to the side of the tank body (13). The stirring device (2) includes a main shaft motor (21) installed on the top of the outer shell of the tank (13) and at least two auxiliary shaft motors (22) arranged in a ring around the central axis of the main shaft motor (21). The output end of the secondary shaft motor (22) is provided with a secondary rotating shaft (221) that extends through the inner cavity of the tank (13). The secondary rotating shaft (221) has spirally distributed spiral blades (222) on the outer wall of the inner cavity section of the tank (13). The output end of the main shaft motor (21) is provided with a main rotating shaft (211) that extends through the inner cavity of the tank body (13). The main rotating shaft (211) is provided with at least one set of vertical rotating frames in the inner cavity section of the tank body (13). The inner cavity of the main rotating shaft (211) is hollow. The vertical rotating frame includes multiple crossbars (212) equal in number to the secondary shaft motor (22), flipping blades (214) provided on the crossbars (212), and a sliding collar (216) that slides in the inner cavity of the main rotating shaft (211). The multiple crossbars (212) in the vertical rotating frame are all rotatably connected to the sliding collar (216), and the end of the crossbar (212) away from the main rotating shaft (211) is vertically flipped in cooperation with the helical blades (222). The crossbar (212) includes a horizontal section disposed on the outside of the main rotating shaft (211) and a vertical section disposed in the inner cavity of the main rotating shaft (211). The side wall of the main rotating shaft (211) is provided with a side hole (219) that cooperates with the crossbar (212) and extends through to the inner cavity of the main rotating shaft (211). The horizontal width of the side hole (219) is equal to the horizontal width of the horizontal section of the crossbar (212), and the vertical width of the side hole (219) is greater than the vertical width of the horizontal section of the crossbar (212). The vertical section of the crossbar (212) away from the horizontal section is rotatably connected to the sliding collar (216). The horizontal section of the crossbar (212) near the vertical section is connected to the outer shell of the main rotating shaft (211) by a first spring (215). The horizontal section of the crossbar (212) away from the vertical section is fitted with a rotating ring (213), which abuts against the spiral blade (222).

2. The stirring device as described in claim 1, characterized in that: The vertical rotating frame also includes a partition (218) that forms a partition in the inner cavity of the main rotating shaft (211), and a second spring (217) connecting the partition (218) and the sliding collar (216). The partition (218) in the vertical rotating frame is located above the sliding collar (216).

3. The stirring device as described in claim 2, characterized in that: The flipping blade (214) is located in the area between the rotating ring (213) and the first spring (215) on the horizontal section of the crossbar (212), and the flipping blade (214) is spirally arranged around the central axis of the horizontal section of the crossbar (212).

4. The stirring device as described in claim 1, characterized in that: The mixing tank (1) also includes an upper hollow jacket (14) disposed at the top of the tank body (13) and a lower hollow jacket (15) disposed at the bottom of the tank body (13). The top of the lower hollow jacket (15) is provided with a sliding hole (16) for inserting and rotating with the main rotating shaft (211).

5. The stirring device as described in claim 4, characterized in that: The secondary shaft motor (22) is installed on the same plane as the main shaft motor (21) at the top of the tank (13). The output ends of both the main shaft motor (21) and the secondary shaft motor (22) pass through the upper hollow interlayer (14).

6. The stirring device as described in claim 5, characterized in that: The feed inlet (11) is located at the connection between the tank body (13) and the upper hollow interlayer (14), and the discharge outlet (12) is located at the connection between the tank body (13) and the lower hollow interlayer (15).

7. A stirring method, wherein the stirring method is applied to a stirring apparatus as described in claim 5 or 6, characterized in that: Includes a current monitoring unit for monitoring the current of the auxiliary shaft motor; It also includes the following steps: S1: Open the feed port (11) and close the discharge port (12). Then add the raw material into the inner cavity of the tank (13) through the feed port (11). Turn on the main shaft motor (21) so that the main shaft (211) drives multiple vertical rotating frames to mix the raw material evenly. Turn off the main shaft motor (21). S2: Turn on the secondary shaft motor (22) so that the secondary shaft (221) drives the spiral blade (222) to start stirring. When multiple secondary shafts (221) are stirring, they all maintain the same and constant speed. S3: Disconnect the secondary shaft motor (22) and connect the main shaft motor (21) to mix and stir; disconnect the main shaft motor (21) after the preset mixing time. Among them, the current monitoring unit monitors the stirring current value of each secondary shaft motor (22), obtains the monitoring current value of each motor and compares whether it is within the preset value range; If the monitored current value of any of the sub-shaft motors (22) reaches the preset value range, and the monitored current value of any of the sub-shaft motors (22) does not reach the preset value range, then step S2 will be stopped and step S3 will be started. After the preset mixing time is reached, stop executing step S3 and start executing step S2. Repeat steps S2-S3 until the current values ​​of all sub-shaft motors (22) reach the preset range, then disconnect the sub-shaft motors (22) from the main spindle motor (21) and end the execution steps.

8. The stirring method as described in claim 7, characterized in that: In step S1, the stirring time of the main shaft motor (21) is 20-30 minutes; In step S3, the preset mixing time for the main spindle motor (21) is 10-15 minutes.

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