Electric roller

Abstract

The invention relates to an electric roller which comprises a duplex gear speed reducing mechanism, and the duplex gear speed reducing mechanism structurally comprises at least one stage of sun duplex gear, N planetary duplex gear sets and a gear ring. At least one stage of sun duplex gear and an output gear shaft of the motor are coaxially arranged; the N planetary duplex gear sets surround at least one stage of sun duplex gear, each planetary duplex gear set structurally comprises a planetary pin, and at least one stage of planetary duplex gear and an output planetary gear are sequentially arranged on the planetary pin in a sleeving mode in the axial direction; two ends of the planetary pin are fixedly connected with a fixing part in the cylinder; each stage of sun duplex gear is sequentially meshed with the planetary duplex gear, and finally the output planetary gear is meshed with the gear ring to drive the barrel to rotate; the N planetary duplex gears of each stage are evenly distributed with the sun duplex gear as the center, and N is larger than or equal to 3. The structure stability of the speed reducing mechanism is improved, parts are reduced, the temperature rise and noise of the roller are reduced, and the operation stability and reliability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of rollers, in particular to a motorized roller. Background Art

[0002] In the prior art, electric drums driven by multi-stage double-gear reduction often adopt a single-sided external meshing transmission method, and each stage of the sun gear is only fitted with one planetary gear, that is, only one planetary gear is arranged along the circumferential direction. This structural design has certain limitations: the sun gear is unevenly stressed, and corresponding gear racks, gear rings and planetary gears need to be set to meet the needs of multi-stage reduction. This leads to the following problems: the positioning accuracy of the gear rack is high, which brings inconvenience to processing and assembly. Due to the large number of gear racks and gear rings, the drum temperature rise is large and the noise is high. The planetary gears revolve while rotating, and a large part of the space inside the gear box is wasted, making it impossible to thread the wire. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an electric roller, the purpose of which is to improve the stability of the speed reduction mechanism structure, reduce parts, reduce the temperature rise and noise of the roller, and improve the stability and reliability of operation.

[0004] The technical solution adopted by the present invention is as follows:

[0005] An electric drum comprises a cylinder, wherein a motor and a double-tooth reduction mechanism connected to the motor are arranged in the cylinder, wherein an output end of the double-tooth reduction mechanism is connected to the cylinder, and the structure of the double-tooth reduction mechanism comprises at least one level of double-toothed sun gear, N double-toothed planetary gear groups, and a gear ring;

[0006] The at least one primary sun double gear is coaxially arranged with the output gear shaft of the motor;

[0007] The N planetary double gear groups surround the at least one first-stage sun double gear, and the structure of each planetary double gear group is:

[0008] It comprises a planetary pin, on which at least one first-stage planetary double-linked gear and an output planetary gear are sequentially sleeved in the axial direction;

[0009] Both ends of the planetary pin are fixedly connected to the fixed components in the cylinder;

[0010] The planetary pins of N planetary double gear sets are arranged in parallel;

[0011] Among them, the input tooth segments of N first-stage planetary double teeth are meshed and transmitted with the output gear shaft at the same time, and are evenly distributed along the circumference with the output gear shaft as the center; the output tooth segments of N first-stage planetary double teeth are meshed and transmitted with the input tooth segments of the first-stage sun double teeth at the same time, the output tooth segments of the first-stage sun double teeth are meshed and transmitted with the input tooth segments of N second-stage planetary double teeth at the same time, and the output tooth segments of N second-stage planetary double teeth are meshed and transmitted with the input tooth segments of the second-stage sun double teeth at the same time, until the output tooth segments of the last-stage sun double teeth are meshed and transmitted with the N output planetary teeth at the same time, and the N output planetary teeth are meshed and transmitted with the gear ring at the same time, and the gear ring is connected to the cylinder and is coaxially arranged; among them, N≥3.

[0012] Further technical solutions are:

[0013] There is clearance fit between each of the planetary pins and the planetary duplex teeth sleeved thereon;

[0014] An oil guide groove is provided on the end surface of at least one end of the planetary double gear, one end of which is connected to the inner hole of the planetary double gear for matching with the planetary pin, and the other end is connected to the circumferential outer wall of the planetary double gear.

[0015] The sun duplex gear is a solid gear structure without an inner hole.

[0016] The fixing components at both ends of the planetary pin are provided with axial limiting surfaces, which respectively limit the at least one stage of double planetary gears and the output planetary gears on the planetary pin in the axial direction.

[0017] The fixing component comprises a stator bracket and a threading shaft bracket respectively located at two ends of the cylinder;

[0018] The stator bracket is matched with the output gear shaft through a bearing member, one end of the stator bracket is used to install the stator of the motor, and the other end is provided with a connecting portion;

[0019] A threading channel is formed inside the threading shaft frame, and the outside of the threading shaft frame is connected to a support sleeve through a bearing member, and the support sleeve is connected to the cylinder body and is coaxially arranged.

[0020] The outer portion of the connecting portion is matched with the reducer housing through a bearing member;

[0021] The reducer housing is connected to one end of the support sleeve, and the other end of the support sleeve is connected to the sealing cover to seal the cylinder.

[0022] The gear ring is located on the inner wall of the supporting sleeve, and the two are fixedly connected or integrally formed.

[0023] The planetary pin is fixedly connected to the fixed component through the cage gear box support;

[0024] The cage gearbox supports a space formed therein for accommodating the at least one first-stage sun double gear and N planetary double gear sets;

[0025] The two ends of the cage gear box support are respectively connected to the fixing component;

[0026] The cage gearbox support has corresponding assembly holes at both ends for tight fit with the planetary pins;

[0027] One or more connecting columns are arranged on the supporting circumferential side of the cage gear box, and a wire passing channel is formed in the connecting column.

[0028] One or more threading tubes are arranged in the cylinder, and two ends of each threading tube are respectively connected to the fixing component.

[0029] The motor is an inner rotor or outer rotor motor.

[0030] The beneficial effects of the present invention are as follows:

[0031] At least one stage of the sun double-tooth of the present invention is located at the center of the reduction structure, and the sun double-tooth is meshed with at least three planetary double-tooths (or output planetary teeth) evenly distributed around it in the circumferential direction. Compared with the traditional single-sided external meshing transmission, the uniformity of force is greatly improved and the operating noise is reduced.

[0032] At least one level of planetary double-linked teeth and output planetary teeth of each planetary double-linked gear group of the present invention are connected in series on the same planetary pin, that is, they share a planetary pin. The planetary pins of each group of planetary double-linked gear groups are arranged in parallel and at fixed positions, ensuring that the center distance of at least three planetary double-linked teeth (or output planetary teeth) evenly distributed in the circumferential direction is constant, and all planetary teeth rotate on their own instead of revolving around the sun. This not only provides space for threading in the reduction box, but also only requires the provision of a gear ring at the output position, thereby reducing the heat source of the drum temperature rise and reducing noise. At the same time, it also reduces the remaining space in the reduction housing, and grease lubrication can be used to avoid the risk of oil leakage. In addition, the planetary pins used by each level of planetary gears solve the shortcomings of multiple toothed discs and numerous parts in conventional planetary reduction structures, and avoid the problem of inconvenience in processing and installation caused by the high requirements for the installation position of the traditional gear rack.

[0033] The planetary duplex gear of the present invention is provided with an oil guide groove, which can further guide lubricating grease into the matching gap to improve the cooling effect.

[0034] The meshing of the sun double gear and the evenly distributed planetary double gears and output planetary gears of the present invention also realizes the axial and radial limitation of the sun double gear itself, and can maintain a stable position without an axle, thereby reducing the number of parts.

[0035] Other features and advantages of the present invention will be set forth in the following description or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0037] Figure 2 for Figure 1 Section view of section AA.

[0038] Figure 3 Schematic diagram of the structure of the sun double gear according to an embodiment of the present invention.

[0039] Figure 4 It is a schematic diagram of the structure of a planetary double gear according to an embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of Example 2 of the present invention.

[0041] Figure 6 for Figure 5 Section view of section AA.

[0042] Figure 7 It is a schematic structural diagram of a cage gearbox support according to an embodiment of the present invention.

[0043] Figure 8 It is a schematic diagram of the arrangement structure of the cage gearbox support and at least one stage of double sun gears and N double planetary gear sets according to an embodiment of the present invention.

[0044] In the figure: 1. gear shaft connecting frame; 2. stator; 3. output gear shaft; 4. power cord; 5. cage gear box support; 6. planetary pin; 7. cable; 8. first-stage planetary double gear; 9. first-stage sun double gear; 10. second-stage planetary double gear; 11. output sun double gear; 12. output planetary gear; 13. gear ring; 14. cylinder; 15. threading shaft frame; 16. reducer housing; 17. second-stage sun double gear; 18. third-stage planetary double gear; 19. stator bracket; 20. cover; 21. threading tube; 51. connecting column; 52. assembly hole; 81. oil guide groove; 82. inner hole; 131. support sleeve; 191. connecting part; 301. PCB board; 511. wire passage. DETAILED DESCRIPTION

[0045] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0046] Example 1

[0047] See also Figure 1 and Figure 2As shown, the electric drum of this embodiment includes a cylinder 14, in which a motor and a double-tooth reduction mechanism connected to the motor are arranged, the output end of the double-tooth reduction mechanism is connected to the cylinder 14, and the structure of the double-tooth reduction mechanism includes at least one level of sun double-tooth, N planetary double-tooth groups, and a gear ring 13;

[0048] The at least one primary sun double gear is coaxially arranged with the output gear shaft 3 of the motor;

[0049] N planetary double gear groups surround at least one level of sun double gears, and the structure of each planetary double gear group is:

[0050] It includes a planetary pin 6, on which at least one first-stage planetary double-linked gear and an output planetary gear 12 are sequentially sleeved in the axial direction;

[0051] Both ends of the planetary pin 6 are fixedly arranged, and can be directly fixedly connected to the fixed components in the cylinder 14 or fixedly arranged through the cage gear box support 5;

[0052] The planet pins 6 of the N planetary double gear sets are arranged in parallel.

[0053] Wherein, the at least one first-stage planetary double-coupled teeth include a first-stage planetary double-coupled teeth 8, and the at least one first-stage sun double-coupled teeth include a first-stage sun double-coupled teeth 9;

[0054] The output gear shaft 3 is the output shaft of the motor, and its output end is provided with external teeth. The input tooth segments of N first-stage planetary double teeth 8 are meshed with the output gear shaft 3 at the same time, and are evenly distributed along the circumference with the output gear shaft 3 as the center; the output tooth segments of the N first-stage planetary double teeth 8 are meshed with the input tooth segments of the first-stage sun double teeth 9 at the same time to achieve a first-stage deceleration; the first-stage sun double teeth 9 also serve as the final-stage sun double teeth, and its output tooth segments are meshed with the input tooth segments of N output planetary teeth 12 at the same time to achieve a second-stage deceleration, and the output tooth segments of the N output planetary teeth 12 are meshed with the ring gear 13 at the same time, and the ring gear 13 is connected to the cylinder 14 and is coaxially arranged, so that the decelerated torque is output to the cylinder 14.

[0055] Since the structure design of this embodiment is reasonable, no matter how many stages of reduction are set, it is only necessary to set a gear ring at the output position of the reduction mechanism, thereby greatly reducing the heat source of the cylinder temperature rise and reducing noise.

[0056] As a specific implementation, N=3, and 4 or more can be set as needed. The three primary planetary double gears 8 and the three output planetary gears 12 respectively surround the middle primary sun double gear 9 and form meshing. The primary sun double gear 9 is meshed at three points around the circle, and the force is evenly applied to prevent the noise problem caused by uneven force on one side, thereby improving the reliability and stability of the reduction mechanism. At the same time, the three-point meshing also reduces the internal space of the reduction mechanism, making it easier to use grease lubrication and avoiding the oil leakage problem caused by oil lubrication.

[0057] In addition, the meshing of the primary sun double gear 9 and the evenly distributed planetary double gears and output planetary gears also realizes the axial and radial limitation of the primary sun double gear 9 itself, and the position can be kept stable without the need for axles. Therefore, the specific structure of the sun double gear in this embodiment is as follows: Figure 3 As shown, it includes a coaxially arranged input tooth segment and an output tooth segment, and the whole is a solid gear structure without an inner hole.

[0058] In this embodiment, each planetary pin 6 and the planetary double-linked gear sleeved thereon are clearance-matched to ensure that grease enters the fitting clearance. Figure 4 The structure of the planetary double gear of this embodiment includes a coaxially arranged input gear segment and an output gear segment, and an oil guide groove 81 is provided on the end surface of at least one end of the planetary double gear, one end of which is connected to the inner hole 82 of the planetary double gear for matching with the planetary pin 6, and the other end is connected to the circumferential outer wall of the planetary double gear. Through the oil guide groove 81, lubricating grease can be further introduced into the matching gap to improve the cooling effect.

[0059] A plurality of oil guiding grooves 81 are evenly distributed along the circumferential direction; each oil guiding groove 81 extends in the radial direction.

[0060] Preferably, the number of the oil guide grooves 81 is N, corresponding to the number of the planetary double gear sets, to ensure that the gears in each set can be lubricated.

[0061] like Figure 1 As shown, the fixing component includes a stator bracket 19 and a threading shaft bracket 15 respectively located at two ends of the cylinder 14;

[0062] The stator bracket 19 is matched with the output gear shaft 3 through a bearing. One end of the stator bracket 19 is used to install the stator 2 of the motor, and the other end is provided with a connecting portion 191;

[0063] A threading channel is formed inside the threading shaft frame 15 , and the outside of the threading shaft frame 15 is connected to the support sleeve 131 through a bearing member. The support sleeve 131 is connected to the cylinder body 14 and is coaxially arranged.

[0064] The outside of the connecting portion 191 cooperates with the reducer housing 16 through a bearing member; the reducer housing 16 is connected to one end of the support sleeve 131, and the other end of the support sleeve 131 is connected to the cover 20 to seal the cylinder 14 to form a sealed space for accommodating the double-tooth reduction mechanism.

[0065] See also Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, in this embodiment, the planet pin 6 is fixedly connected to the fixed component through the cage gear box support 5.

[0066] The cage gearbox support 5 has a space formed therein for accommodating the at least one first-stage sun double gear and N planetary double gear sets;

[0067] The cage gearbox support 5 has corresponding mounting holes 52 at both ends thereof, which are used to tightly fit with the planetary pin 6;

[0068] One or more connecting columns 51 are provided on the circumferential side of the cage gear box support 5 , and a wire passage 511 is formed in the connecting column 51 .

[0069] Both ends of the cage gear box support 5 are connected to the fixing components respectively.

[0070] The two ends of the cage gearbox support 5 can be used to axially limit the first-stage planetary duplex teeth 8 and the output planetary gears 12.

[0071] Specifically, a recessed groove is provided on the end surface of the cage gear box support 5, and the support 5 can be fixed to the connecting portion 191 and the threading shaft frame 15 by means of press-fitting or bolt connection.

[0072] Since the position of the planetary pin is fixed, the planetary double gears of each level and the output planetary gears in each planetary double gear group rotate on their own but do not revolve, so that the center distance between the planetary gears in the circumferential direction is kept constant. A stable threading space is formed inside the reducer housing, which is convenient for the cables to pass through the reducer housing. Therefore, in this embodiment, a wire passage 511 can be set in the connecting column 51 of the cage gear box support 5. The cables 7 (including the power line 4, control line, signal line, etc.) of the electric drum pass through the threading channel in the threading shaft frame 15, and then pass through the wire passage 511 of the connecting column 51, and finally connect to the motor.

[0073] Figure 8 At least one stage of double sun teeth and N double planetary gear sets in the middle cage gearbox support 5 form a multi-stage reduction structure, and details can be found in Example 2.

[0074] As a specific implementation, the gear ring 13 is located on the inner wall of the supporting sleeve 131, and the two are fixedly connected or integrally formed.

[0075] As a specific implementation, the reducer housing 16 and the support sleeve 131 are press-fitted by interference.

[0076] As a specific implementation, the support sleeve 131 and the cylinder body 14 are fixedly connected by interference fitting, welding or the like.

[0077] The portion of the threading shaft frame 15 extending out of the cylinder body 14 can be used to be fixed on a fixed device such as a frame of a roller conveyor line.

[0078] The motor of this embodiment is an inner rotor or outer rotor motor. Take the outer rotor as an example, see Figure 1The magnetic steel of the motor is arranged on the inner wall of the gear shaft connecting frame 1 , and the PCB board 301 of the motor is sleeved on the stator bracket 19 .

[0079] Example 2

[0080] See also Figure 5 and Figure 6 Compared with the first embodiment, the electric roller of this embodiment has the same design principle and concept of the entire structure, but increases the number of transmission stages of the reduction mechanism to achieve more stages of reduction.

[0081] The electric drum of this embodiment differs from that of Embodiment 1 in that:

[0082] The at least one first-stage planetary double gear also includes a second-stage planetary double gear 10 and a third-stage planetary double gear 18;

[0083] The at least one primary sun duplex gear further comprises a secondary sun duplex gear 17 and an output sun duplex gear 11:

[0084] The first-stage planetary duplex teeth 8, the second-stage planetary duplex teeth 10, the third-stage planetary duplex teeth 18, and the output planetary teeth 12 are sequentially sleeved on the same planet pin 6; the first-stage sun duplex teeth 9, the second-stage sun duplex teeth 17, and the output sun duplex teeth 11 are sequentially arranged along the axial direction and are coaxial with the output gear shaft 3.

[0085] The structures of the sun duplex gears at each level are the same, see Figure 3 The double gear structure of each level of planet is the same, see Figure 4 .

[0086] Among them, the input tooth segments of N primary planetary double teeth 8 are meshed with the output gear shaft 3 at the same time, and are evenly distributed along the circumference with the output gear shaft 3 as the center; the output tooth segments of N primary planetary double teeth 8 are meshed with the input tooth segments of the primary sun double teeth 9 at the same time to realize the primary transmission; the output tooth segments of the primary sun double teeth 9 are meshed with the input tooth segments of N secondary planetary double teeth 10 at the same time to realize the secondary transmission; the output tooth segments of N secondary planetary double teeth 10 are meshed with the input tooth segments of the secondary sun double teeth 17 The tooth segments are meshed simultaneously to achieve three-stage transmission; the secondary sun duplex teeth 17 are meshed simultaneously with the input tooth segments of the N three-stage planetary duplex teeth 18 to achieve four-stage transmission; the output tooth segments of the N three-stage planetary duplex teeth 18 are meshed simultaneously with the input tooth segments of the output sun duplex teeth 11 to achieve five-stage transmission; the output sun duplex teeth 11 serve as the final sun duplex teeth, and its output tooth segments are meshed simultaneously with the N output planetary teeth 12 to achieve six-stage transmission, and the N output planetary teeth 12 are meshed with the ring gear 13 at the same time.

[0087] The three-dimensional structure of the above multi-stage reduction structure can be seen in Figure 8 The middle cage gearbox supports the structure within 5.

[0088] In addition to the above differences, both ends of the planetary pin 6 of this embodiment are directly fixedly connected to the connecting portion 191 of the stator bracket 19 and the threading shaft bracket 15, that is, the cage gear box support 5 may not be provided in this embodiment.

[0089] Threads or hexagonal steps can be provided at both ends of the planetary pin 6.

[0090] The inner end surface of the connecting portion 191 of the stator bracket 19 and the inner end surface of the threading shaft frame 15 constitute an axial limiting surface for axially limiting the at least one-stage planetary duplex gear and the output planetary gear 12 .

[0091] Since the cage gear box support 5 is not provided, in order to achieve threading, in this embodiment, one or more threading tubes 21 are directly provided in the cylinder 14, and both ends of each threading tube 21 are respectively connected to the stator bracket 19 and the threading shaft frame 15.

[0092] As a specific implementation method, Figure 6 As shown, the threading tube 21 is located between two circumferentially adjacent planetary double gear sets and is arranged parallel to the planetary pin 6. The cross section of the threading tube 21 can be set to be circular. The cables 7 (including the power line 4, control line, signal line, etc.) of the electric drum pass through the threading channel in the threading shaft frame 15, and then pass through the wire channel 511 of the connecting column 51, and finally connected to the motor.

[0093] It is understandable that parameters such as the number of teeth, module, radius, etc. of each level of sun duplex gear, planetary duplex gear, and output planetary gear are specifically set according to the deceleration requirements.

[0094] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric drum, comprising a cylinder (14), wherein a motor and a double-tooth reduction mechanism connected to the motor are arranged inside the cylinder (14), wherein the output end of the double-tooth reduction mechanism is connected to the cylinder (14), characterized in that: The structure of the duplex gear reduction mechanism comprises at least one stage of duplex sun gears, N sets of duplex planetary gears, and a ring gear (13); The at least one first-stage sun double gear is coaxially arranged with the output gear shaft (3) of the motor; The N planetary double gear groups surround the at least one first-stage sun double gear, and the structure of each planetary double gear group is: It comprises a planetary pin (6), wherein the planetary pin (6) is sequentially sleeved on at least one first-stage planetary double-linked tooth and an output planetary tooth (12) along the axial direction; Both ends of the planetary pin (6) are fixedly connected to the fixing components in the cylinder (14); The planet pins (6) of the N planetary double gear sets are arranged in parallel; The input tooth segments of the N first-stage double planetary teeth mesh with the output gear shaft (3) for transmission at the same time, and are evenly distributed along the circumference with the output gear shaft (3) as the center; the output tooth segments of the N first-stage double planetary teeth mesh with the input tooth segments of the first-stage double sun teeth for transmission at the same time, the output tooth segments of the first-stage double sun teeth mesh with the input tooth segments of the N second-stage double planetary teeth for transmission at the same time, the output tooth segments of the N second-stage double planetary teeth mesh with the input tooth segments of the second-stage double sun teeth for transmission at the same time, until the output tooth segments of the last-stage double sun teeth mesh with the N output planetary teeth (12) for transmission at the same time, the N output planetary teeth (12) mesh with the gear ring (13) for transmission at the same time, and the gear ring (13) is connected to the cylinder (14) and is coaxially arranged; wherein N≥3.

2. The electric drum according to claim 1, characterized in that: There is clearance fit between each of the planetary pins (6) and the planetary double-linked teeth sleeved thereon; An oil guide groove (81) is provided on the end surface of at least one end of the planetary double gear, one end of which is connected to an inner hole (82) of the planetary double gear for cooperating with a planetary pin (6), and the other end of which is connected to the circumferential outer wall of the planetary double gear.

3. The electric drum according to claim 1, characterized in that: The sun duplex gear is a solid gear structure without an inner hole.

4. The electric drum according to claim 1, characterized in that: The fixing components at both ends of the planetary pin (6) are provided with axial limiting surfaces, which respectively limit the axial position of the at least one-stage planetary double-linked teeth and the output planetary gear (12) on the planetary pin (6).

5. The electric drum according to claim 1, characterized in that: The fixing component comprises a stator bracket (19) and a threading shaft bracket (15) respectively located at two ends of the cylinder (14); The stator bracket (19) is internally matched with the output gear shaft (3) via a bearing member, one end of the stator bracket (19) is used to mount the stator (2) of the motor, and the other end is provided with a connecting portion (191); A threading channel is formed inside the threading shaft frame (15), and the outside of the threading shaft frame (15) is connected to a support sleeve (131) via a bearing member, and the support sleeve (131) is connected to the cylinder body (14) and is coaxially arranged.

6. The electric drum according to claim 5, characterized in that: The exterior of the connecting portion (191) is matched with the reducer housing (16) via a bearing member; The reducer housing (16) is connected to one end of the support sleeve (131), and the other end of the support sleeve (131) is connected to the sealing cover (20) to seal the cylinder (14).

7. The electric drum according to claim 5, characterized in that: The gear ring (13) is located on the inner wall of the supporting sleeve (131), and the two are fixedly connected or integrally formed.

8. The electric drum according to claim 1, characterized in that: The planetary pin (6) is fixedly connected to the fixed component via a cage gear box support (5); The cage gearbox support (5) has a space formed therein for accommodating the at least one first-stage sun double gear and N planetary double gear sets; Both ends of the cage gear box support (5) are respectively connected to the fixing component; The cage gear box support (5) is provided with assembly holes (52) at both ends thereof for tightly fitting with the planetary pin (6); One or more connecting columns (51) are provided on the circumferential side surface of the cage gear box support (5), and a wire passage (511) is formed in the connecting column (51).

9. The electric drum according to claim 1, characterized in that: One or more threading tubes (21) are arranged in the cylinder (14), and both ends of each threading tube (21) are respectively connected to the fixing component.

10. The electric drum according to claim 1, characterized in that: The motor is an inner rotor or outer rotor motor.

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