A vertical permanent magnet direct drive synchronous motor assembly for a blender

Abstract

The application discloses a vertical permanent magnet direct drive synchronous motor assembly for a mixer and belongs to the technical field of motor assemblies. The vertical permanent magnet direct drive synchronous motor assembly comprises a box body, a permanent magnet motor and a stirring device connected to the two ends of the box body, a key sleeve arranged in the box body and used for connecting a main shaft of the permanent magnet motor and a stirring shaft of the stirring device, so that the power of the permanent magnet motor can be directly transmitted to the stirring shaft. The horizontal direction pulling force of the connecting rod on the base can pull the floating ring to rotate along the circumferential direction of the key sleeve. When the key groove and the key strip completely coincide when the floating ring drives the key sleeve to rotate, the key sleeve has the condition of axial movement, and the rotation of the rotating disc can pull the key sleeve to axially move and be sleeved outside the main shaft through the connecting rod, so that the power transmission of the permanent magnet motor is realized. Different from the mode that the traditional electric cylinder directly drives the key sleeve to axially move, the driving assembly of the application can complete the automatic butt joint of the key sleeve and the main shaft, and realizes the quick connection of the two.

Description

Technical Field

[0001] This invention relates to the field of electric motor assembly technology, and in particular to a vertical permanent magnet direct drive synchronous motor assembly for a mixer. Background Technology

[0002] Traditional mixers often employ a combination of a conventional motor and a speed reducer, which suffers from a series of problems such as low overall efficiency, high energy consumption, and high maintenance costs. With the development of permanent magnet synchronous direct drive motor technology, structures driven by permanent magnet synchronous direct drive motors are gradually gaining widespread use. This structure offers advantages such as high overall efficiency, low maintenance, and high overload starting capacity.

[0003] Chinese invention patent CN117160306B discloses a mixer driven by a permanent magnet motor. Compared with the transmission method of asynchronous motor and reducer used in the prior art, the permanent magnet motor can maintain a constant speed even when the load rate is too high. It can maintain a stable speed for mixing some chemical raw materials and improve the mixing effect of materials.

[0004] Although the above-mentioned device drives the limiting bushing and connecting ring to move axially through a miniature electric cylinder to realize the power transmission between the permanent magnet motor and the stirring shaft, in the actual assembly process, it is necessary to manually calibrate the meshing position of the drive shaft and the connecting shaft connected to the permanent magnet motor before the electric cylinder can be started to drive the connecting ring to move and complete the power connection. This makes the operation process slightly redundant and difficult to meet the working conditions that require the drive shaft and the stirring shaft to be quickly and accurately connected.

[0005] Therefore, it is necessary to provide a vertical permanent magnet direct-drive synchronous motor assembly for a mixer to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a vertical permanent magnet direct drive synchronous motor assembly for a mixer, so as to solve the technical problems mentioned in the background art.

[0007] Based on the above ideas, the present invention provides the following technical solution: a vertical permanent magnet direct-drive synchronous motor assembly for a mixer, comprising: The housing has a permanent magnet motor and a stirring device connected to its two ends, respectively. The key sleeve, located inside the housing, is used to connect the main shaft of the permanent magnet motor to the stirring shaft of the mixing equipment, so that the power of the permanent magnet motor can be directly transmitted to the stirring shaft. A floating ring is fitted onto the outside of the key sleeve and locked to the key sleeve along its own axial direction; A driving component is connected to the floating ring to drive the floating ring to move along the axis of the key sleeve. When the key sleeve is limited during axial movement, the driving component can drive the floating ring and the key sleeve to rotate circumferentially along the key sleeve.

[0008] As a further embodiment of the present invention: the driving component includes a connecting rod disposed on the top of the floating ring and in an inclined state, a base is disposed on the top of the floating ring, a limit pin is fixed at the bottom end of the connecting rod, the limit pin passes through a pre-set through hole on the base, and a connecting shaft is fixedly installed on the top surface of the floating ring, the top end of the connecting shaft being rotatably connected to the base.

[0009] As a further aspect of the present invention: the outer circumferential surface of the key sleeve protrudes outward to form an annular limiting portion, and two sets of the limiting portion are provided, with the floating ring disposed between the two sets of limiting portions.

[0010] As a further aspect of the present invention: a snap-fit ​​assembly is provided between the floating ring and the key sleeve, and a positioning ring is fixedly sleeved on the outer side of the spindle. When the positioning ring disengages from the snap-fit ​​assembly, the floating ring can be locked to the key sleeve by the snap-fit ​​assembly.

[0011] As a further aspect of the present invention: the snap-fit ​​assembly is located at the limiting part at the top end, the snap-fit ​​assembly includes a snap-fit ​​pin, the snap-fit ​​pin slides in cooperation with the limiting part along the axial direction of the key sleeve, the top end face of the floating ring is provided with multiple sets of slots that cooperate with the snap-fit ​​pin, a rocker arm is provided at the snap-fit ​​pin, the protrusion fixed at the top end of the snap-fit ​​pin slides in the guide groove provided on the rocker arm, so that the rocker arm can drive the snap-fit ​​pin to move along the axial direction of the key sleeve during the rotation of the rocker arm around the fixed axis, the tail end of the rocker arm is provided with a plate-shaped extrusion member, and the extrusion member is elastically connected to the limiting part along the axial direction of the key sleeve, and the extrusion member is provided with a slot for the rocker arm to pass through.

[0012] As a further aspect of the present invention: a pulley is rotatably connected to the outer circular surface of the floating ring, the rotation axis of the pulley is perpendicular to the diameter of the floating ring, the inner side of the box that contacts the pulley has an arc surface structure, and the pulley is in close contact with the inner wall of the box.

[0013] As a further aspect of the present invention: a driving unit is provided inside the housing, the driving unit being used to drive the connecting rod to move along the axis of the key sleeve.

[0014] As a further embodiment of the present invention: the driving unit is a turntable installed inside the housing, the connecting rod is installed between the floating ring and the turntable, and a pin is installed on the turntable, the pin passing through the top end of the connecting rod and rotatably connected to the connecting rod.

[0015] As a further aspect of the present invention: the driving unit is an electric cylinder, and the output end of the electric cylinder is hinged to the top of the connecting rod.

[0016] As a further aspect of the present invention: both the main shaft and the stirring shaft are provided with key bars that mesh with the key sleeve on their outer circular surfaces.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: During the rotation of the turntable, the horizontal pulling force of the connecting rod on the base can pull the floating ring to rotate along the circumference of the key sleeve. When the floating ring drives the key sleeve to rotate so that the keyway and the key bar are completely aligned, the key sleeve has the conditions for axial movement. As the turntable continues to rotate, the connecting rod can pull the key sleeve axially and place it on the outside of the main shaft, realizing the power transmission of the permanent magnet motor. Unlike the traditional method of directly driving the key sleeve axially with an electric cylinder, the drive assembly of this solution can automatically connect the key sleeve and the main shaft, realizing a rapid connection between the two. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the box of the present invention; Figure 3 This is a schematic diagram of the drive component structure of the present invention; Figure 4 This is the present invention. Figure 3 A magnified structural diagram at point A; Figure 5 This is a schematic diagram of the snap-fit ​​assembly structure of the present invention; Figure 6 This is a schematic diagram of the connection structure of the main shaft, stirring shaft and key sleeve of the present invention; Figure 7 This is the present invention. Figure 6 A magnified structural diagram at point B; Figure 8 This is a schematic diagram of the positioning ring structure of the present invention; Figure 9 This is a schematic diagram of the limiting part structure of the present invention; Figure 10 This is a schematic diagram of the connection structure between the connecting rod and the floating ring of the present invention.

[0020] In the diagram: 1. Permanent magnet motor; 2. Housing; 3. Stirring shaft; 4. Key sleeve; 401. Limiting part; 5. Floating ring; 501. Pulley; 502. Slot; 6. Main shaft; 601. Positioning ring; 7. Key bar; 8. Rotating shaft; 9. Turntable; 901. Pin; 10. Connecting rod; 1001. Limiting pin; 11. Base; 1101. Connecting shaft; 12. Locking pin; 1201. Protrusion; 13. Rocker arm; 1301. Guide groove; 14. Extrusion part; 1401. Groove; 15. Slide rod; 16. Connecting part; 17. Bushing. Detailed Implementation

[0021] like Figures 1-10As shown, this invention discloses a vertical permanent magnet direct-drive synchronous motor assembly for a mixer. This assembly is mainly installed in mixing equipment to achieve a direct connection between the main shaft 6 of the permanent magnet motor 1 and the mixing shaft 3. Traditional mixing equipment transmission systems often use a structure where a common motor is connected to the mixing shaft 3 via a reducer. This structure suffers from many drawbacks during operation, such as a long transmission chain, high energy consumption, and cumbersome maintenance. Compared to the traditional structure, this application uses a direct-drive connection between the main shaft 6 of the permanent magnet motor 1 and the mixing shaft 3, which has significant advantages such as high transmission efficiency, stable operation, and low maintenance costs.

[0022] like Figures 1-3 As shown, a housing 2 is provided between the permanent magnet motor 1 and the stirring device. The housing 2 is bolted to the top of the stirring device, and the permanent magnet motor 1 is detachably connected to the side of the housing 2 away from the stirring device. In one embodiment, the main shaft 6 of the permanent magnet motor 1 and the stirring shaft 3 are directly connected by a flange connection. This structure can ensure power transmission efficiency, but it has the disadvantage of cumbersome on-site installation and calibration procedures. Based on this, another embodiment of this application uses a key sleeve 4 transmission structure to connect the main shaft 6 of the permanent magnet motor 1 and the stirring shaft 3. Specifically, both the main shaft 6 of the permanent magnet motor 1 and the stirring shaft 3 are provided with key strips 7 that are adapted to the key sleeve 4 on their outer sides. The key groove on the key sleeve 4 transitions with the key strip 7. The housing 2 is equipped with a drive assembly that drives the key sleeve 4 to move axially along the stirring shaft 3. When the permanent magnet motor 1 is installed in place, the drive assembly can drive the key sleeve 4 to slide axially, so that the key sleeve 4 is synchronously fitted onto the outer side of the key strip 7 of the main shaft 6 and the stirring shaft 3, thereby completing the power transmission. Compared to the flange direct connection embodiment, the key sleeve 4 transmission structure in this embodiment can achieve the power connection between the main shaft 6 of the permanent magnet motor 1 and the stirring shaft 3 more quickly.

[0023] Specifically, a floating ring 5 is coaxially sleeved on the outer side of the key sleeve 4. The floating ring 5 is locked to the key sleeve 4 along the axial direction of the key sleeve 4. The output end of the drive component is connected to the floating ring 5, so that the drive component can drive the floating ring 5 and the key sleeve 4 to move synchronously axially, thereby so that the key sleeve 4 is synchronously sleeved on the outer side of the main shaft 6 and the stirring shaft 3.

[0024] Two sets of drive components are arranged symmetrically on both sides of the floating ring 5. Each drive component includes a turntable 9 and a connecting rod 10 hinged between the turntable 9 and the floating ring 5. Figures 3-4As shown, a pin 901 is fixed at the end face of the turntable 9 near the floating ring 5. The pin 901 passes through the top end of the connecting rod 10 and is rotatably connected to the connecting rod 10. A base 11 is provided at the top of the floating ring 5, and a limit pin 1001 is fixed at the bottom end of the connecting rod 10. The limit pin 1001 passes through a pre-set through hole on the base 11, allowing the limit pin 1001 to move linearly relative to the base 11 and rotate circumferentially. Further, a connecting shaft 1101 is fixedly installed on the top surface of the floating ring 5, and the top end of the connecting shaft 1101 is rotatably connected to the base 11. It should be noted that the connecting rod 10 is always in an inclined state, which is conducive to driving the floating ring 5 to achieve axial movement or circumferential rotation. In addition to driving the connecting rod 10 to move through the turntable 9, an electric cylinder can also be connected to the connecting rod 10, that is, the output end of the electric cylinder is hinged to the top end of the connecting rod 10 to drive the connecting rod 10 to move axially along the key sleeve 4.

[0025] After the permanent magnet motor 1 is installed on the top of the housing 2, it drives the turntable 9 to rotate via an external power unit. Because the circumferential friction between the floating ring 5 and the key sleeve 4 is greater than the axial friction between the key sleeve 4 and the stirring shaft 3, the turntable 9 can drive the floating ring 5 to move axially and approach the main shaft 6 during rotation. When the keyway on the key sleeve 4 aligns with the key bar 7 on the main shaft 6, the rotation of the turntable 9 can directly drive the key sleeve 4 to be fitted onto the outside of the main shaft 6; however, when the keyway on the key sleeve 4 and the key bar 7 on the main shaft 6 are axially misaligned, the axial movement of the key sleeve 4 will be restricted. At this time, during the rotation of the turntable 9, the connecting rod 10 controls the horizontal movement of the base 11 (…). Figure 10 The pulling force in the direction X shown can pull the floating ring 5 to rotate along the circumference of the key sleeve 4. When the floating ring 5 drives the key sleeve 4 to rotate so that the keyway and the key bar 7 are completely aligned, the key sleeve 4 is ready to move axially. The turntable 9 continues to rotate, which can pull the key sleeve 4 axially through the connecting rod 10 and put it on the outside of the main shaft 6, realizing the power transmission of the permanent magnet motor 1. Unlike the traditional method of directly driving the key sleeve 4 to move axially by an electric cylinder, the drive assembly of this solution can complete the automatic docking of the key sleeve 4 and the main shaft 6, realizing the rapid connection between the two.

[0026] In actual operation, to ensure that the floating ring 5 can stably drive the key sleeve 4 to rotate circumferentially, this solution includes a snap-fit ​​component between the floating ring 5 and the key sleeve 4. For example... Figure 5 , Figure 8 As shown, a positioning ring 601 is fixedly sleeved on the outside of the main shaft 6. When the permanent magnet motor 1 is disassembled, the positioning ring 601 is disengaged from the snap-fit ​​assembly, and the floating ring 5 is locked to the key sleeve 4 through the snap-fit ​​assembly, thereby ensuring that the floating ring 5 can drive the key sleeve 4 to rotate stably.

[0027] The outer circumferential surface of the key sleeve 4 protrudes outward to form an annular limiting portion 401. Two sets of limiting portions 401 are provided, and the floating ring 5 is disposed between the two sets of limiting portions 401. The snap-fit ​​assembly is located at the top limiting portion 401. Specifically, the snap-fit ​​assembly includes a snap pin 12, which slides in engagement with the limiting portion 401 along the axial direction of the key sleeve 4. The top end face of the floating ring 5 has multiple sets of slots 502 that engage with the snap pins 12, and the slots 502 are evenly distributed along the circumferential direction of the floating ring 5.

[0028] Furthermore, a lever 13 is provided at the locking pin 12, in conjunction with... Figure 7 As shown, the rocker arm 13 has an opening on the side near the locking pin 12, and a guide groove 1301 is provided at the opening. The guide groove 1301 is arranged along the length of the rocker arm 13. The protrusion 1201 fixed to the top of the locking pin 12 extends into the guide groove 1301 and slides with the rocker arm 13 through the guide groove 1301. A base is fixedly installed on the top of the limiting part 401, and a shaft-shaped connector 16 fixed at the center of the rocker arm 13 is rotatably engaged with the base. Figures 5-7 As shown, the tail end of the rocker arm 13 is provided with a plate-shaped extrusion member 14, the top end of the extrusion member 14 extends above the top end face of the key sleeve 4, and the extrusion member 14 is elastically connected to the limiting part 401 along the axial direction of the key sleeve 4. The extrusion member 14 is provided with a slot 1401 for the rocker arm 13 to pass through.

[0029] In actual use, when the permanent magnet motor 1 needs to be disassembled for repair or maintenance, the turntable 9 can be driven to rotate in one direction, causing the connecting rod 10 to move the floating ring 5 and the key sleeve 4 downwards synchronously, thereby separating the key sleeve 4 from the main shaft 6 and avoiding interference between the main shaft 6 and the key sleeve 4 when the permanent magnet motor 1 is disassembled. As the permanent magnet motor 1 is disassembled, the pressing member 14 separates from the positioning ring 601 on the outside of the main shaft 6, and the pressing member 14 can spring upwards along the axis of the key sleeve 4. At this time, the bottom of the slot 1401 will apply pressure to the tail end of the rocker arm 13, causing the end of the rocker arm 13 away from the pressing member 14 to move downwards, and then the rocker arm 13 will drive the locking pin 12 to move downwards, so that the locking pin 12 is ready to be inserted into the slot 502.

[0030] When the permanent magnet motor 1 is reinstalled on the housing 2, it can drive the turntable 9 to rotate in another direction, causing the connecting rod 10 to drive the floating ring 5 and the key sleeve 4 to move axially. If the keyway on the key sleeve 4 is misaligned with the key bar 7 on the spindle 6, the axial movement of the key sleeve 4 is restricted. At this time, the horizontal pulling force of the connecting rod 10 on the base 11 can pull the floating ring 5 to rotate. When the locking pin 12 is aligned with the slot 502, one end of the locking pin 12 can be inserted into the slot 502, so that the floating ring 5 can stably drive the key sleeve 4 to rotate, thereby making the key bar 7 completely overlap with the keyway, so that the connecting rod 10 can continue to drive the floating ring 5 and the key sleeve 4 to move upward until the key sleeve 4 contacts the positioning ring 601. During this process, the positioning ring 601 applies pressure to the extruder 14, causing the extruder 14 to move downward along the axial direction of the key sleeve 4. The top of the slot 1401 applies downward pressure to the tail end of the rocker arm 13, causing the end of the rocker arm 13 away from the extruder 14 to tilt upward, and driving one end of the locking pin 12 to be pulled out of the slot 502, thereby unlocking the floating ring 5 from the key sleeve 4. At this point, the key sleeve 4 is simultaneously fitted onto the outside of the main shaft 6 and the stirring shaft 3, and the power of the permanent magnet motor 1 can be transmitted to the stirring shaft 3.

[0031] like Figures 1-2 As shown, the opening at the top of the housing 2 can be sealed with a cover plate, and the permanent magnet motor 1 can be fixed to the cover plate. In actual use, the main shaft 6 of the permanent magnet motor 1 is rotatably connected to the cover plate through self-aligning bearings and thrust bearings to achieve radial and axial positioning of the main shaft 6. The stirring shaft 3 is also rotatably connected to the housing 2 through self-aligning bearings and thrust bearings. Using this structure, when the stirring shaft 3 is located in a deep well and cannot be connected to the deep well, the stirring shaft 3 can be suspended at the bottom of the housing 2, allowing the permanent magnet motor 1 to be disassembled separately.

[0032] A groove is formed on the outer circumference of the floating ring 5, and a pulley 501 is rotatably connected to the groove. The inner wall of the housing 2 that contacts the pulley 501 has an arc-shaped structure. The pulley 501 is covered with rubber material and is in close contact with the inner wall of the housing 2. When the connecting rod 10 drives the floating ring 5 to move axially, the pulley 501 can rotate accordingly. Through this structural design, the resistance encountered by the floating ring 5 when moving axially is less than the resistance encountered when rotating circumferentially, thereby ensuring that the connecting rod 10 can preferentially drive the floating ring 5 to achieve axial movement.

[0033] Combination Figure 1 , Figure 3 As shown, a rotating shaft 8 is fixedly installed at the center of the turntable 9. The rotating shaft 8 is connected to the output shaft of the motor installed on the housing 2, so that the motor can drive the turntable 9 to rotate.

[0034] Combination Figure 7As shown, a slide rod 15 is fixed to the protruding part on the side of the extrusion member 14, and a bushing 17 is fixedly installed on the limiting part 401. The bottom end of the slide rod 15 extends into the bushing 17 and slides in cooperation with the bushing 17. A spring connects the bushing 17 and the protruding part on the side of the extrusion member 14. When the positioning ring 601 separates from the extrusion member 14, the spring can spring the extrusion member 14 upward, thereby causing one end of the locking pin 12 to be inserted into the slot 502.

[0035] Combination Figure 9 As shown, annular grooves can be formed on the opposite sides of the two sets of limiting parts 401, and annular protrusions 1201 can be provided on the top and bottom of the floating ring 5. Through the rotational engagement of the annular protrusions 1201 and the annular grooves, the floating ring 5 and the limiting parts 401 can be stably connected.

[0036] The above-disclosed embodiments are merely preferred embodiments of this application, intended to facilitate understanding and implementation by those skilled in the art, but should not be construed as limiting the scope of this application. Therefore, equivalent variations made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A vertical permanent magnet direct-drive synchronous motor assembly for a mixer, characterized in that, include: The box body (2) is connected to a permanent magnet motor (1) and a stirring device at both ends; Key sleeve (4), set inside the housing (2), is used to connect the main shaft (6) of the permanent magnet motor (1) and the stirring shaft (3) of the stirring equipment, so that the power of the permanent magnet motor (1) can be directly transmitted to the stirring shaft (3); A floating ring (5) is fitted on the outside of the key sleeve (4) and locked to the key sleeve (4) along its own axis. The driving component is connected to the floating ring (5) to drive the floating ring (5) to move along the axis of the key sleeve (4), and when the key sleeve (4) is limited during axial movement, the driving component can drive the floating ring (5) and the key sleeve (4) to rotate circumferentially along the key sleeve (4).

2. The vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 1, characterized in that: The drive assembly includes a connecting rod (10) disposed on the top of the floating ring (5) and in an inclined state. A base (11) is disposed on the top of the floating ring (5). A limit pin (1001) is fixed at the bottom end of the connecting rod (10). The limit pin (1001) passes through a pre-set through hole on the base (11). A connecting shaft (1101) is fixedly installed on the top surface of the floating ring (5). The top end of the connecting shaft (1101) is rotatably connected to the base (11).

3. The vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 1, characterized in that: The outer circumferential surface of the key sleeve (4) protrudes outward to form an annular limiting part (401). Two sets of limiting parts (401) are provided, and the floating ring (5) is disposed between the two sets of limiting parts (401).

4. The vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 3, characterized in that: A snap-fit ​​assembly is provided between the floating ring (5) and the key sleeve (4). A positioning ring (601) is fixedly sleeved on the outside of the spindle (6). When the positioning ring (601) disengages from the snap-fit ​​assembly, the floating ring (5) can be locked to the key sleeve (4) through the snap-fit ​​assembly.

5. A vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 4, characterized in that: The snap-fit ​​assembly is located at the limiting part (401) at the top end. The snap-fit ​​assembly includes a snap-fit ​​pin (12). The snap-fit ​​pin (12) slides in cooperation with the limiting part (401) along the axial direction of the key sleeve (4). The top end face of the floating ring (5) is provided with multiple sets of slots (502) that cooperate with the snap-fit ​​pin (12). A rocker arm (13) is provided at the snap-fit ​​pin (12). The protrusion (1201) fixed at the top end of the snap-fit ​​pin (12) slides in the guide groove (1301) provided on the rocker arm (13), so that the rocker arm (13) can drive the snap-fit ​​pin (12) to move along the axial direction of the key sleeve (4) during the rotation of the rocker arm (13) around the fixed axis. A plate-shaped extrusion member (14) is provided at the tail end of the rocker arm (13), and the extrusion member (14) is elastically connected to the limiting part (401) along the axial direction of the key sleeve (4). A slot (1401) is provided on the extrusion member (14) for the rocker arm (13) to pass through.

6. A vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 1, characterized in that: A pulley (501) is rotatably connected to the outer circular surface of the floating ring (5). The rotation axis of the pulley (501) is perpendicular to the diameter of the floating ring (5). The inner side of the box (2) that contacts the pulley (501) is an arc surface structure, and the pulley (501) is in close contact with the inner wall of the box (2).

7. A vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 2, characterized in that: The housing (2) is equipped with a drive unit, which is used to drive the connecting rod (10) to move along the axis of the key sleeve (4).

8. A vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 7, characterized in that: The drive unit is a turntable (9) installed inside the housing (2). The connecting rod (10) is located between the floating ring (5) and the turntable (9). A pin (901) is installed on the turntable (9). The pin (901) passes through the top of the connecting rod (10) and is rotatably connected to the connecting rod (10).

9. A vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 7, characterized in that: The drive unit is an electric cylinder, and the output end of the electric cylinder is hinged to the top of the connecting rod (10).

10. A vertical permanent magnet direct-drive synchronous motor assembly for a mixer according to claim 1, characterized in that: Both the main shaft (6) and the stirring shaft (3) are provided with key bars (7) that mesh with the key sleeve (4) on their outer circular surfaces.

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