Electric fan rotating device and double-head electric fan thereof

Abstract

The electric fan rotating device comprises a circumferential rotating column, a column core positioning seat and a bearing, the lower portion of the circumferential rotating column is fixedly connected with a downwards-protruding positioning column core, a positioning column hole is formed in the middle of a downwards-concave portion of the top of the column core positioning seat, the bearing is horizontally fixed in the middle of the downwards-concave portion, and the column core positioning seat is fixedly connected with the bearing. The lower convex positioning column core penetrates through the bearing and the positioning column hole; the downward-protruding positioning column core is movably connected with the column core positioning base and the bearing in the circumferential direction, and the circumferential rotating column can rotate in the circumferential direction relative to the column core positioning base through the downward-protruding positioning column core. The concave part is arranged at the top of the column core positioning seat and used for mounting the bearing, the positioning column hole is formed in the middle of the concave part, and the convex positioning column core fixedly connected with the circumferential rotating column can penetrate through the bearing and the positioning column hole, so that the connection between the circumferential rotating column and the column core positioning seat is good in smoothness and stable; when the circumferential rotating column circumferentially rotates relative to the column core positioning seat, the friction coefficient is reduced, the rotation is smooth, and the resistance is small.

Description

Technical Field

[0001] This utility model relates to the field of household appliances, specifically to an electric fan rotating device and its double-headed electric fan. Background Technology

[0002] 1. Existing Chinese patent document publication number: CN217380960U discloses a dual-head circulating fan, including a base, a foot post, and a motor fixing device. The motor fixing device includes a left and right oscillating electric device, a motor mounting housing, a left cross-sectional plate, and a right cross-sectional plate. The left and right oscillating electric device includes an arc-shaped toothed stage disposed on the side wall of the top edge of the foot post, a motor bracket, a left and right oscillating drive motor, and a left and right oscillating drive gear. The motor bracket is movably connected to the top of the foot post. The left and right oscillating drive motor is longitudinally fixed to the motor bracket. The left and right oscillating drive gear is fixed to the motor shaft end of the left and right oscillating drive motor. The left and right oscillating drive gear is meshed with the arc-shaped toothed stage. The motor bracket can rotate circumferentially relative to the foot post. A rotating shaft extends downward from the bottom of the motor bracket. The top cross-section of the foot post has a shaft hole, which can be inserted into the shaft hole. This forms a movable connection between the motor bracket and the top of the foot post, and the motor bracket can rotate circumferentially relative to the foot post through the rotating shaft.

[0003] The left and right oscillation electric device in the aforementioned dual-head circulating fan relies solely on the left and right oscillation drive gear fixed to the motor shaft end of the left and right oscillation drive motor and the arc-shaped gear on the side wall of the top edge of the foot rod to drive the fan head to oscillate left and right. After a period of use, mechanical wear will occur between the internal gears, resulting in poor drive efficiency during rotation, easy mechanical failure, and affecting service life. Furthermore, the rotation angle of the left and right oscillation is not large enough, and the fan head will vibrate unstablely when working at high power. This structure is also not suitable for use in high-power commercial or industrial electric fans.

[0004] 2. Existing Chinese patent document publication number: CN222363160U discloses a left and right oscillation drive structure for a fan, including a fixed frame, a rotating frame, a drive assembly, and a rotating assembly; the rotating frame is rotatably connected to the fixed frame through the rotating assembly, and the drive assembly includes a drive motor fixed on the rotating frame, the output shaft of the drive motor is fixed inside the fixed frame, and the drive motor drives the fixed frame to rotate relative to the rotating frame or drives the rotating frame to rotate the fixed frame.

[0005] The aforementioned fan's left and right oscillation drive structure has many parts, a high coefficient of rotational friction that is not smooth enough, complicated and troublesome installation, low production efficiency, and high overall cost. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides an electric fan rotation device. By providing a recessed portion at the top of the column core positioning seat for mounting a bearing, and simultaneously opening a positioning pin hole in the middle of the recessed portion, the convex positioning pin core, which is fixedly connected to the circumferential rotating column, can pass through the bearing and the positioning pin hole. This ensures a smooth and stable connection between the circumferential rotating column and the column core positioning seat. When the circumferential rotating column rotates circumferentially relative to the column core positioning seat, the coefficient of friction is reduced, the rotation is smooth, and the resistance is low. The solution to the above technical problems is as follows:

[0007] An electric fan rotating device includes a circumferential rotating column, a column core positioning seat, and a bearing. A downwardly protruding positioning column is fixedly connected to the lower part of the circumferential rotating column. The top of the column core positioning seat has a recessed portion, and a positioning column hole is opened in the middle of the recessed portion. The bearing is horizontally fixed in the middle of the recessed portion. The downwardly protruding positioning column passes through the bearing and the positioning column hole. The downwardly protruding positioning column is circumferentially movably connected to the column core positioning seat and the bearing. The circumferential rotating column can rotate circumferentially relative to the column core positioning seat through the downwardly protruding positioning column.

[0008] Further, in the preferred technical solution: the lower convex positioning core is provided with an upper slot and a lower slot in the circumferential direction, and an upper clamp and a lower clamp are fixed to the upper slot and the lower slot respectively. The upper clamp is located at the top hole wall section of the positioning core hole, and the lower clamp is located at the bottom hole wall section of the positioning core hole. The upper clamp and the lower clamp clamp the core positioning seat.

[0009] A further preferred technical solution includes a driving device, wherein an annular plate is provided on the circumferential rotating column, the annular plate is located at the top of the lower convex positioning column core, the driving device is mounted on the annular plate and the column core positioning seat, and the driving device drives the circumferential rotating column to rotate relative to the column core positioning seat.

[0010] A further preferred technical solution: The driving device includes a DC motor, a gear ring, and a motor pinion. The DC motor is vertically mounted on the top of the annular plate. A motor shaft hole is provided on one side of the annular plate. The output shaft of the DC motor passes through the motor shaft hole. A motor pinion is fixedly connected to the end of the output shaft of the DC motor. The motor pinion is arranged below the annular plate. The gear ring is horizontally embedded and fixed in the recess of the column core positioning seat. An arc-shaped tooth hole is provided on one side of the gear ring, and an arc-shaped tooth stage is provided on the side wall of the arc-shaped tooth hole. The motor pinion meshes with the arc-shaped tooth stage provided on the gear ring.

[0011] A further preferred technical solution: a protruding post is provided on the other side of the toothed ring, and a rotation limiting arc groove is provided on the other side of the annular plate. The protruding post is embedded in the rotation limiting arc groove and moves back and forth in parallel, thereby limiting the angular range of the circumferential rotating post to rotate left and right.

[0012] A further preferred technical solution: the top of the circumferential rotating column is a concave elliptical support, and a fan motor is fixedly installed on the elliptical support.

[0013] Further, in the preferred technical solution: the fan motor is a dual-output shaft motor.

[0014] Further, in the preferred technical solution: the circumferential rotating column and the outer periphery of the dual-output shaft motor are detachably connected to a left upper shell and a right upper shell. The upper parts of the left upper shell and the right upper shell are respectively provided with corresponding left motor fixing holes and right motor fixing holes. The left and right ends of the dual-output shaft motor are fixed through the left motor fixing holes and the right motor fixing holes.

[0015] Further, in the preferred technical solution: a lower left shell is integrally connected to the left side of the column core positioning seat, and a foot mounting hole is provided at the bottom of the lower left shell. A lower right shell is detachably installed on the right side of the column core positioning seat. The lower left shell and the lower right shell are detachably connected. A gear position controller is connected to the wall of the lower right shell. The convex positioning column core is provided with a through-hole for electrical wires. A control circuit board is fixed to the side wall of the circumferential rotating column. The control circuit board is connected to the dual-output shaft motor through a motor wire. The gear position controller is connected to the control circuit board through a power cord, which passes through the electrical wire hole. The gear position controller controls the switching and gear position of the dual-output shaft motor.

[0016] Further, in the preferred technical solution: the clamp is made of steel; the circumferential rotating column can rotate within an angle range of 0 to 340°; the circumferential rotating column, the lower convex positioning column core, the annular plate, and the elliptical support are integrally formed; the column core positioning seat, the lower left shell, and the foot rod mounting hole are integrally formed.

[0017] A dual-head electric fan includes the aforementioned fan rotation device.

[0018] The beneficial effects of this electric fan rotation device and its dual-head electric fan are as follows: 1. By providing a recessed part at the top of the column core positioning seat for installing the bearing, and simultaneously opening a positioning pin hole in the middle of the recessed part, the convex positioning pin core, which is fixedly connected to the circumferential rotating column, can pass through the bearing and the positioning pin hole, resulting in a smooth and stable connection between the circumferential rotating column and the column core positioning seat. When the circumferential rotating column rotates circumferentially relative to the column core positioning seat, the coefficient of friction is reduced, the rotation is smooth, the resistance is low, and the fan head rotates easily. 2. This product allows for a larger rotation angle for the fan head to oscillate left and right. When operating at high power, the fan head vibration frequency is very low, and the rotation is stable. This structure is more suitable for use in high-power commercial or industrial electric fans. 3. After the column core positioning seat passes through the bearing and the positioning pin hole, upper and lower clamps are engaged to prevent the circumferential rotating column from floating up and down / coming out, thereby improving the stability of the fan rotation. 4. The circumferential rotating column, the convex positioning column core, the annular plate, and the elliptical support are designed as a single piece. While achieving the goal of limiting the left and right rotation angle of the fan, the number of parts is reduced, the integration is high, it is easy to install, and the production cycle is shortened. Attached Figure Description

[0019] Figure 1 This is a front perspective view of the product of this utility model;

[0020] Figure 2 This is a rear perspective view of the product of this utility model;

[0021] Figure 3 This is a perspective view of the product of this utility model from behind;

[0022] Figure 4 This is a cross-sectional view of the product of this utility model;

[0023] Figure 5 This is a cross-sectional view of the product of this utility model;

[0024] Figure 6 This is a perspective view of the product of this utility model without the upper shell covering it.

[0025] Figure 7 This is a perspective view of the driving device of the present invention.

[0026] Figure 8 This is a perspective view of the toothed ring and the core positioning seat of the present invention in their installation state.

[0027] Figure 9 This is a perspective view of the toothed ring and the core positioning seat of the present invention in a disassembled state.

[0028] Figure 10 A perspective view of the column-free positioning seat of this utility model when it is obstructed;

[0029] Figure 11 , Figure 12 This is an exploded view of the casing of the product of this utility model;

[0030] Figure 13 This is an exploded view of the product of this utility model;

[0031] Figure 14 , Figure 15 This is an exploded view of the internal structure of the product of this utility model;

[0032] Figure 16 This is a disassembled diagram of the product of this utility model assembled into a fan;

[0033] Figure 17 A three-dimensional view of the product of this utility model assembled into a fan;

[0034] Figure 18 The right view of the product of this utility model assembled into a fan;

[0035] Figure 19 This is a rear view of the product of this utility model assembled into a fan;

[0036] Figure 20 Left view of the product of this utility model assembled into a fan;

[0037] Figure 21 This is a front view of the product of this utility model assembled into a fan.

[0038] Circumferential rotating column (1), column core positioning seat (2), bearing (3), lower convex positioning column core (4), lower recess (5), positioning column hole (6), upper slot (7), lower slot (8), upper clamp (9), lower clamp (10), drive device (11), DC motor (111), gear ring (112), motor pinion (113), ring plate (12), motor shaft hole (13), arc tooth hole (14), arc tooth stage (15), convex column (16), rotation limit arc groove (17), elliptical support Seat (18), Dual-shaft motor (19), Upper left shell (20), Upper right shell (21), Left motor mounting hole (22), Right motor mounting hole (23), Lower left shell (24), Leg mounting hole (25), Lower right shell (26), Gear controller (27), Wiring hole (28), Control circuit board (29), Seat wing (30), Left fan cover (31), Right fan cover (32), Left impeller (33), Right impeller (34), Leg (35), Base (36), Decorative cover (37) Detailed Implementation

[0039] An electric fan rotation device includes a circumferential rotating column 1, a column core positioning seat 2, and a bearing 3. A downwardly protruding positioning column core 4 is fixedly connected to the lower part of the circumferential rotating column 1. The top of the column core positioning seat 2 has a recessed portion 5, with a positioning column hole 6 in the middle of the recessed portion 5. The bearing 3 is horizontally fixed in the middle of the recessed portion 5, and its outer ring is embedded and clamped into the inner wall of the recessed portion 5. The circumferential rotating column 1 and the downwardly protruding positioning column core 4 are arranged vertically. The downwardly protruding positioning column core 4 passes through the bearing 3 and the positioning column hole 6. The downwardly protruding positioning column core 4 is clamped and fixedly connected to the inner ring of the bearing 3. The bearing 3 is a ball bearing. The downwardly protruding positioning column core 4 is circumferentially movably connected to the column core positioning seat 2 and the bearing 3, allowing the circumferential rotating column 1 to rotate circumferentially relative to the column core positioning seat 2 via the downwardly protruding positioning column core 4.

[0040] In use, a recessed portion is provided at the top of the core positioning seat 2 for mounting the bearing 3. A positioning pin hole 6 is also provided in the middle of the recessed portion 5. The convex positioning pin core 4, integrally fixedly connected to the circumferential rotating column 1, can pass through the bearing 3 and the positioning pin hole 6, ensuring a smooth and stable connection between the circumferential rotating column 1 and the core positioning seat 2. The positioning pin hole 6 is short, between 3 cm and 5 cm in height. When the circumferential rotating column 1 rotates circumferentially relative to the core positioning seat 2, the coefficient of friction is reduced, resulting in smooth rotation and low resistance, making it easy for the fan head to rotate. The core positioning seat 2 is relatively large and heavy, ensuring that the dual-output shaft motor 19 operates without vibration at low power and with significantly reduced torque vibration frequency at high power, making the dual-output shaft motor 19 more stable and suitable for high-power commercial or industrial electric fans. The fan head is fixedly mounted on the top of the circumferential rotating column 1, thereby driving the fan head to rotate circumferentially.

[0041] The lower convex positioning core 4 of this utility model has an upper slot 7 and a lower slot 8 circumferentially formed. Upper clamps 9 and lower clamps 10 are correspondingly fixed to the upper slots 7 and lower slots 8, respectively. The upper clamps 9 and lower clamps 10 are made of steel. The upper clamp 9 is located at the top opening wall section of the positioning core hole 6, and the lower clamp 10 is located at the bottom opening wall section of the positioning core hole 6. The upper clamps 9 and lower clamps 10 clamp the core positioning seat 2. After passing through the bearing 3 and the positioning core hole 6, the lower convex positioning core 4 is engaged with the upper clamps 9 and lower clamps 10 for limiting and fixing. The upper clamps 9 and lower clamps 10 are made of sturdy, durable, and non-deformable materials, which can prevent the circumferential rotating column 1 from floating up and down or coming off, thus improving the stability of the circumferential rotating column 1 driving the fan head to rotate.

[0042] This utility model also includes a driving device 11. An annular plate 12 is integrally extended on the circumferential rotating column 1, and the annular plate 12 is located at the top of the lower convex positioning column core 4. The circumferential rotating column 1, the annular plate 12, and the lower convex positioning column core 4 are integrally injection molded. The driving device 11 is installed on the annular plate 12 and the column core positioning seat 2. The driving device 11 drives the circumferential rotating column 1 to rotate relative to the column core positioning seat 2 to realize the electric left and right oscillation of the fan.

[0043] The driving device 11 of this utility model includes a DC motor 111, a gear ring 112, and a motor pinion 113. The DC motor 111 is vertically fixed to the top of the annular plate 12 by a screw assembly. The annular plate 12 has a motor shaft hole 13 on one side, through which the output shaft of the DC motor 111 passes. The motor pinion 113 is clamped and fixedly connected to the output shaft end of the DC motor 111. The motor pinion 113 is arranged below the annular plate 12. The gear ring 112 is horizontally embedded and fixed to the recessed part 5 of the core positioning seat 2 by a screw assembly. The top section of the core positioning seat 2 is horizontal. An arc toothed hole 14 is opened on one side of the gear ring 112, and an arc toothed stage 15 is opened on the side wall of the arc toothed hole 14. The motor pinion 113 meshes with the arc toothed stage 15 on the gear ring 112. A control circuit board 29 is fixed to the side wall of the circumferential rotating column 1. The DC motor 111 is connected to the control circuit board 29 via wires. The control circuit board 29 is connected to a gear position controller 27 via wires. The gear position controller 27 controls the operation of the DC motor 111. When the DC motor 111 is working, it drives the motor pinion 113 to rotate along the arc tooth stage 15. The DC motor 111 moves synchronously with the circumferential rotating column 1. The gear ring 112 and the column core positioning seat 2 do not rotate. The drive device 11 has a compact and simple structure, is easy to install, has low cost, provides stable rotation, has a large rotation angle, and the rotation angle range can be flexibly designed, making it widely applicable.

[0044] The toothed ring 112 of this utility model is provided with a protruding post 16 on the other side, and a rotating limiting arc groove 17 on the other side. The protruding post 16 is embedded in the rotating limiting arc groove 17 and moves back and forth in parallel. The rotation angle is consistent with the rotating limiting arc groove 17, thereby limiting the range of left and right rotation angle of the circumferential rotating column 1.

[0045] The circumferential rotating column 1 of this invention has a concave elliptical support 18 at its top. A fan motor is fixedly mounted on the elliptical support 18 using a screw assembly. The circumferential rotating column 1, the convex positioning column core 4, the annular plate 12, and the elliptical support 18 are integrally injection molded, resulting in low cost, fewer parts, high production efficiency, good stability, and low vibration frequency during high-power operation. This invention features high integration, convenient installation, short production cycle, and can be equipped with a single-shaft or dual-shaft motor.

[0046] The fan motor described in this invention is a dual-shaft motor 19. The elliptical support 18 extends outwards with a mounting wing 30. The side of the dual-shaft motor 19 can be embedded into the lower groove of the elliptical support 18 and is detachably connected to the mounting wing 30. The side of the dual-shaft motor 19 and the mounting wing 30 are detachably connected via a screw and nut assembly. The design of the dual-shaft motor 19 allows for the installation of impellers at both ends of a single fan, enabling airflow from both ends and increasing the range of air delivery angles.

[0047] The circumferential rotating column 1 and the dual-output shaft motor 19 of this utility model are detachably connected to a left upper shell 20 and a right upper shell 21. The upper parts of the left upper shell 20 and the right upper shell 21 are respectively provided with corresponding left motor fixing holes 22 and right motor fixing holes 23. The left and right ends of the dual-output shaft motor 19 are fixed through the left motor fixing holes 22 and right motor fixing holes 23, which increases the volume of the column body, increases the stability of the dual-output shaft motor 19, and reduces the vibration frequency. The left upper shell 20 and the right upper shell 21 enclose the circumferential rotating column 1 and the annular plate 12, increase the outer shell protection, and ensure safe use.

[0048] The outer end walls of the upper left shell 20 and the upper right shell 21 of this utility model are each fixed with a left fan cover 31 and a right fan cover 32 by screw assemblies. The left and right ends of the dual-output shaft motor 19 extend into the left fan cover 31 and the right fan cover 32 respectively. The left and right sides of the motor shaft of the dual-output shaft motor 19 are detachably connected to the left impeller 33 and the right impeller 34 respectively. The left impeller 33 and the right impeller 34 are arranged inside their respective left fan covers 31 and right fan covers 32. The motor shafts of the dual-output shaft motor 19 are arranged opposite to each other. The left impeller 33 and the left fan cover 31 are arranged opposite to the right impeller 34 and the right fan cover 32. The blades of the left impeller 33 and the right impeller 34 have three to eleven blades. The left impeller 33 and the right impeller 34 are detachably connected to their respective motor shafts by nuts. A detachable decorative cover 37 is provided in the front middle of the left fan cover 31 and the right fan cover 32. This completes the installation of the fan head, ensuring good stability.

[0049] The column positioning base 2 of this utility model is integrally connected to a lower left shell 24 on its left side. The lower left shell 24 has a foot mounting hole 25 at its bottom. The column positioning base 2, the lower left shell 24, and the foot mounting hole 25 are integrally formed. The lower right shell 26 is detachably installed on the right side of the column positioning base 2. The lower left shell 24 and the lower right shell 26 are detachably connected and fixed by a screw assembly. The side of the foot mounting hole 25 has a threaded hole for installing a nut. The foot mounting hole 25 is connected to the upper part of the foot 35 by a nut. The bottom of the foot 35 is connected to the base 36, thereby realizing floor installation. The installation is simple, convenient, and highly integrated. The lower right shell 26 is connected to a gear position controller 27. The lower convex positioning core 4 is provided with a through wire hole 28. The control circuit board 29 is connected to the dual-output shaft motor 19 through a motor wire. The gear position controller 27 is connected to the control circuit board 29 through a power line, which passes through the wire hole 28. The gear position controller 27 controls the switching and gear position of the dual-output shaft motor 19.

[0050] The circumferential rotating column 1 of this utility model can rotate within an angle range of 0 to 340°, preferably 0 to 270°, and is generally set to 0 to 180°, thus providing a wide air supply range.

[0051] A dual-head electric fan includes the aforementioned fan rotation device.

Claims

1. An electric fan rotating device characterized by: Including circumferential rotation column (1), column core positioning seat (2) and bearing (3), the lower part of the circumferential rotation column (1) is fixedly connected with the lower convex positioning column core (4), the top of the column core positioning seat (2) is provided with a lower concave part (5), the middle of the lower concave part (5) is provided with a positioning column hole (6), the bearing (3) is horizontally fixed in the middle of the lower concave part (5), the lower convex positioning column core (4) passes through the bearing (3), positioning column hole (6);The lower convex positioning column core (4) is circumferentially movably connected with the column core positioning seat (2) and the bearing (3), and the circumferential rotation column (1) can rotate circumferentially relative to the column core positioning seat (2) through the lower convex positioning column core (4).

2. The electric fan rotating device as claimed in claim 1, wherein: The lower convex positioning column core (4) is circumferentially provided with an upper clamping groove (7) and a lower clamping groove (8), the upper clamping groove (7) and the lower clamping groove (8) are correspondingly fixed with an upper clamping hoop (9) and a lower clamping hoop (10), the upper clamping hoop (9) is located on the top hole wall section of the positioning column hole (6), the lower clamping hoop (10) is located on the bottom hole wall section of the positioning column hole (6), and the upper clamping hoop (9) and the lower clamping hoop (10) clamp the column core positioning seat (2).

3. An electric fan rotating device as claimed in claim 1 or 2, characterized in that: The electric fan rotating device further comprises a driving device (11), the circumferential rotation column (1) is provided with an annular plate (12), the annular plate (12) is located on the top of the lower convex positioning column core (4), the driving device (11) is installed on the annular plate (12) and the column core positioning seat (2), and the driving device (11) drives the circumferential rotation column (1) to rotate relative to the column core positioning seat (2).

4. The electric fan rotating device as claimed in claim 3, wherein: The driving device (11) comprises a DC motor (111), a gear ring (112) and a motor pinion (113), the DC motor (111) is vertically installed on the top of the annular plate (12), one side of the annular plate (12) is provided with a motor shaft hole (13), the output shaft of the DC motor (111) penetrates through the motor shaft hole (13), the output shaft of the DC motor (111) is fixedly connected with the motor pinion (113), the motor pinion (113) is arranged below the annular plate (12), the gear ring (112) is horizontally embedded and fixed in the lower concave part (5) of the column core positioning seat (2), one side of the gear ring (112) is provided with a circular arc tooth hole (14), the side wall of the circular arc tooth hole (14) is provided with a circular arc tooth level (15), and the motor pinion (113) is engaged with the circular arc tooth level (15) provided on the gear ring (112).

5. The electric fan rotating device as claimed in claim 4, wherein: The other side of the gear ring (112) is provided with a convex column (16), the other side of the annular plate (12) is provided with a rotating limiting arc-shaped groove (17), the convex column (16) is embedded in the rotating limiting arc-shaped groove (17) and moves back and forth in parallel, so as to limit the angle range of left and right rotation of the circumferential rotation column (1).

6. The electric fan rotating device as claimed in claim 5, wherein: The top of the circumferential rotation column (1) is a lower concave elliptical support (18), and a fan motor is fixedly installed on the elliptical support (18).

7. The electric fan rotating device as claimed in claim 6, wherein: The fan motor is a double-output shaft motor (19).

8. The electric fan rotating device as set forth in claim 7, wherein: The circumferential rotating column (1) and the periphery of the double-output-shaft motor (19) are detachably connected with a left upper shell piece (20) and a right upper shell piece (21), the upper parts of the left upper shell piece (20) and the right upper shell piece (21) are respectively provided with corresponding left motor fixing holes (22) and right motor fixing holes (23), and the left and right ends of the double-output-shaft motor (19) are fixedly connected with the left motor fixing holes (22) and the right motor fixing holes (23).

9. The electric fan rotating device as set forth in claim 8, wherein: The left lower shell piece (24) is integrally connected with the left side of the column core positioning seat (2), the bottom of the left lower shell piece (24) is provided with a foot rod mounting hole (25), the right side of the column core positioning seat (2) is detachably provided with a right lower shell piece (26), the left lower shell piece (24) and the right lower shell piece (26) are detachably connected, the right lower shell piece (26) is connected with a gear control device (27), the lower convex positioning column core (4) is provided with a through-type wire hole (28), the sidewall of the circumferential rotating column (1) is fixedly provided with a control circuit board (29), the control circuit board (29) is connected with the double-output-shaft motor (19) through a motor wire, the gear control device (27) is connected with the control circuit board (29) through a power line, the power line passes through the wire hole (28), and the gear control device (27) controls the switch and the gear of the double-output-shaft motor (19).

10. The electric fan rotating device as set forth in claim 9, wherein: The circumferential rotating column (1) can rotate in a range of 0-340°, the circumferential rotating column (1), the lower convex positioning column core (4), the annular plate (12) and the elliptical support (18) are integrally formed, and the column core positioning seat (2), the left lower shell piece (24) and the foot rod mounting hole (25) are integrally formed.

11. A double ended electric fan characterized by: The electric fan rotating device comprises the electric fan rotating device of any one of claims 1-10.

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