Winding drum direct drive motor and winding device

Abstract

The invention provides a winding drum direct-drive motor and a winding device, and relates to the technical field of steel rolling equipment. The motor and a winding drum are integrated, a mandrel is arranged to be of a hollow structure, a winding drum part is detachably installed in the mandrel, and the mandrel serves as a bearing body for bearing the winding drum part, so that the rigidity and stability of the whole structure are improved; direct power transmission is achieved, a transmission chain is remarkably shortened, and the response precision and the operation efficiency of the system are improved; the inner diameter of the first cavity is the largest, and the inner diameter of the first cavity is gradually reduced in the insertion direction of the winding drum part, so that a guiding effect can be provided during installation of the winding drum part, and the assembly precision and efficiency are ensured; the second cavity is connected with the first cavity and the third cavity, the inner diameter of the second cavity is gradually decreased, smooth transition is formed, stress dispersion of the internal structure of the mandrel is facilitated, meanwhile, the gradient of the inner wall of the second cavity is larger than that of the inner wall of the first cavity, rapid transition from the first cavity to the third cavity is facilitated, and the structural compactness is improved.

Description

Technical Field

[0001] This invention relates to the field of steel rolling equipment technology, and more specifically, to a direct-drive motor for a drum and a winding device. Background Technology

[0002] In the field of steel rolling equipment, coilers and uncoilers are commonly used equipment. Traditional coilers and uncoilers usually adopt an integrated design of the drum and gearbox, with a motor installed at the input end of the gearbox for driving.

[0003] However, this structure suffers from problems such as a long transmission chain, large size, and difficult maintenance, especially under high-speed or high-precision conditions, making it difficult to meet the requirements of dynamic response and compact space. Therefore, how to shorten the transmission chain of the winding device and improve transmission efficiency is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The problem solved by this invention is: how to shorten the transmission chain of the winding device and improve the transmission efficiency.

[0005] To address the above problems, the present invention provides a direct drive motor for a winding drum and a winding device.

[0006] In a first aspect, the present invention provides a direct-drive motor for a drum, comprising: Rotor assembly; The stator assembly is located outside the rotor assembly and is coaxially arranged with the rotor assembly; A mandrel passes through the center of the rotor assembly and is fixedly connected to the rotor assembly and rotates synchronously. The mandrel has a hollow cavity for insertion into the drum component. The hollow cavity includes a first cavity, a second cavity, and a third cavity. The first cavity, the second cavity, and the third cavity are sequentially distributed along the axial direction of the mandrel and penetrate the mandrel. The first cavity is close to the output end of the direct drive motor of the drum. Along the arrangement direction of the first cavity, the second cavity, and the third cavity, the inner diameter of the first cavity gradually decreases, the inner diameter of the second cavity gradually decreases, the slope of the inner wall of the first cavity is less than the slope of the inner wall of the second cavity, and the inner diameter of the third cavity remains unchanged. The minimum inner diameter of the first cavity is equal to the maximum inner diameter of the second cavity, and the minimum inner diameter of the second cavity is equal to the inner diameter of the third cavity.

[0007] Optionally, in the arrangement direction along the first cavity, the second cavity, and the third cavity, the length of the first cavity is greater than the length of the second cavity.

[0008] Optionally, the inner wall of the first cavity is provided with a plurality of first openings, and the inner wall of the second cavity is provided with a plurality of second openings; wherein, the mandrel is provided with an oil injection channel, and the oil injection channel communicates with the first openings and the second openings.

[0009] Optionally, a plurality of the first openings are distributed along the circumference of the first cavity, and a plurality of the second openings are distributed along the circumference of the second cavity.

[0010] Optionally, the plurality of first openings are also distributed along the axial direction of the first cavity, and the distribution density of the first openings in the region closer to the second cavity is greater than the distribution density of the first openings in the region farther away from the second cavity.

[0011] Optionally, the inner wall of the first cavity is a first conical surface, and the inner wall of the second cavity is a second conical surface, wherein the taper of the first conical surface is 1 / 20 to 1 / 18, and the taper of the second conical surface is 1 / 2 to 1.

[0012] Optionally, the inner wall of any one or more of the first cavity, the second cavity, and the third cavity is provided with a first keyway for connection with the roll assembly.

[0013] Optionally, the direct drive motor for the drum further includes a bearing housing and a cooling pipe; wherein, the bearing housing includes a bearing and a housing, the bearing is sleeved on the end of the spindle and coaxially arranged with the spindle, the housing is sleeved on the outside of the bearing, and the cooling pipe flows through the housing.

[0014] Optionally, a first annular groove is provided on the end of the mandrel; the direct drive motor of the drum also includes a locking flange ring detachable from the mandrel, the locking flange ring being sleeved on the end of the mandrel, and the inner side of the locking flange ring being provided with a first annular protrusion that cooperates with the first annular groove.

[0015] Secondly, the present invention also provides a winding device, including a direct drive motor for a drum as described in any of the above descriptions, and a drum component.

[0016] The beneficial effects of this invention are as follows: By integrating the motor and the drum into one unit, the intermediate transmission links such as traditional gearboxes and couplings are eliminated. The mandrel is set as a hollow structure, and the drum component is detachably installed inside the mandrel. The mandrel, as the main load-bearing body for the drum component, not only improves the rigidity and stability of the overall structure, but also realizes direct power transmission, significantly shortens the transmission chain, and improves the system response accuracy and operating efficiency. At the same time, in the hollow mandrel, the inner diameter of the first cavity is the largest, and the inner diameter of the first cavity gradually decreases along the insertion direction of the drum component, which can facilitate the guidance during the installation of the drum component and ensure assembly accuracy and efficiency. The second cavity connects the first cavity and the third cavity. The inner diameter of the second cavity gradually decreases, forming a smooth transition, which is conducive to stress dispersion in the internal structure of the mandrel. At the same time, the slope of the inner wall of the second cavity is greater than that of the inner wall of the first cavity, which facilitates a quick transition from the first cavity to the third cavity and improves the structural compactness. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first structure of the direct drive motor for the drum in an embodiment of the present invention; Figure 2 This is a schematic diagram of a second structure of the direct drive motor for the drum in an embodiment of the present invention; Figure 3 This is a schematic diagram of the locking flange ring of the direct drive motor for the drum in an embodiment of the present invention; Figure 4 This is a schematic diagram of the winding device in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 10. Drum direct drive motor; 11. Drum component; 21. Rotor assembly; 22. Stator assembly; 30. Mandrel; 31. First cavity; 32. Second cavity; 33. Third cavity; 34. First opening; 35. Second opening; 36. First keyway; 37. First annular groove; 38. Oil injection channel; 40. Bearing seat; 41. Bearing; 42. Housing; 50. Cooling pipe; 60. Locking flange ring; 61. First annular protrusion; 62. First split part; 70. Winding device. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] In the attached diagram, the plane containing the X and Y axes represents a horizontal plane, and any direction on the horizontal plane is considered a horizontal direction. The Z axis represents the vertical direction, i.e., up and down position, with the positive direction of the Z axis representing up and the negative direction representing down. It should be noted that the aforementioned representations of the X, Y, and Z axes are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] In the field of steel rolling equipment, coilers and uncoilers are commonly used devices. Traditional coilers and uncoilers typically employ an integrated design of the coil and gearbox, with a motor installed at the input end of the gearbox for drive. However, this structure suffers from problems such as a long transmission chain, large size, and difficult maintenance, especially under high-speed or high-precision conditions, making it difficult to meet the requirements of dynamic response and space compactness. Therefore, how to shorten the transmission chain of the coiling device and improve transmission efficiency is a technical problem that urgently needs to be solved by those skilled in the art.

[0024] To address the problems existing in the aforementioned related technologies, the present invention provides a direct drive motor 10 for a drum and a winding device 70.

[0025] Combination Figures 1 to 3As shown, this embodiment of the invention provides a direct-drive drum motor 10, including a rotor assembly 21, a stator assembly 22, and a spindle 30. The stator assembly 22 is located outside the rotor assembly 21 and is coaxially arranged with the rotor assembly 21. The spindle 30 passes through the center of the rotor assembly 21 and is fixedly connected to the rotor assembly 21 and rotates synchronously. The spindle 30 has a hollow cavity for insertion into a drum component 11. The hollow cavity includes a first cavity 31, a second cavity 32, and a third cavity 33, which are located along the spindle. The mandrels 30 are distributed axially and pass through the mandrel 30. The first cavity 31 is close to the output end of the direct drive motor 10. Along the arrangement direction of the first cavity 31, the second cavity 32 and the third cavity 33, the inner diameter of the first cavity 31 gradually decreases, the inner diameter of the second cavity 32 gradually decreases, the slope of the inner wall of the first cavity 31 is less than the slope of the inner wall of the second cavity 32, the inner diameter of the third cavity 33 remains unchanged, the minimum inner diameter of the first cavity 31 is equal to the maximum inner diameter of the second cavity 32, and the minimum inner diameter of the second cavity 32 is equal to the inner diameter of the third cavity 33.

[0026] The spindle 30 passes through the center of the rotor assembly 21 and rotates synchronously with it, realizing the direct transmission of power from the rotor assembly 21 to the spindle 30. This completely eliminates intermediate transmission links such as gearboxes and couplings in traditional structures, significantly shortening the transmission chain. The hollow cavity design enables the integrated connection between the drum component 11 and the spindle 30, forming an integrated structure between the motor and the drum. This further reduces the overall size of the equipment, solving the problem of the large size of traditional structures and facilitating installation in space-constrained steel rolling environments.

[0027] The first cavity 31 is located near the output end (i.e., near the insertion end of the drum component) and has the largest inner diameter. Its inner diameter gradually decreases along the insertion direction of the drum component 11. It can serve as a guide structure for drum installation, guiding the drum to be accurately inserted into the hollow cavity, avoiding offset or jamming during installation, and improving assembly accuracy and efficiency. The inner diameter of the second cavity 32 continues to gradually decrease, achieving a smooth transition with the first cavity 31. At the same time, it provides support for the positioning of the middle section of the drum component 11, making the contact between the drum component 11 and the mandrel 30 more intimate and the force more even. The inner diameter of the third cavity 33 remains unchanged, which can form stable support and limit for the tail of the drum component 11, ensuring the coaxiality of the drum after installation, avoiding radial movement during operation, and ensuring winding / unwinding accuracy. The first cavity 31 has a smaller slope, which extends the guide contact length and further improves the guiding accuracy of the drum component 11 installation. At the same time, it makes the contact surface between the drum component 11 and the first cavity 31 larger, the force is more dispersed, and the local stress concentration is reduced. The second cavity 32 has a larger slope, which can realize a quick transition from the first cavity 31 to the third cavity 33. While ensuring the reliability of the connection, it shortens the length of the transition section, makes the internal structure of the mandrel 30 more compact, and provides a more reasonable force angle for the subsequent disassembly of the drum.

[0028] By integrating the motor and drum into one unit, the intermediate transmission links such as traditional gearboxes and couplings are eliminated. The mandrel 30 is designed as a hollow structure, and the drum component 11 is detachably installed inside the mandrel 30. The mandrel 30, as the main support for the drum component 11, not only improves the rigidity and stability of the overall structure, but also realizes direct power transmission, significantly shortens the transmission chain, and improves the system response accuracy and operating efficiency. At the same time, in the hollow mandrel 30, the inner diameter of the first cavity 31 is the largest, and the inner diameter of the first cavity 31 gradually decreases along the insertion direction of the drum component 11, which can facilitate the guidance of the drum component 11 during installation and ensure assembly accuracy and efficiency. The second cavity 32 connects the first cavity 31 and the third cavity 33. The inner diameter of the second cavity 32 gradually decreases, forming a smooth transition, which is conducive to stress dispersion in the internal structure of the mandrel 30. At the same time, the slope of the inner wall of the second cavity 32 is greater than that of the inner wall of the first cavity 31, which facilitates a quick transition from the first cavity 31 to the third cavity 33 and improves the structural compactness.

[0029] In some embodiments, please refer to the following for details. Figure 1 , Figure 2Along the arrangement direction of the first cavity 31, the second cavity 32, and the third cavity 33, the length of the first cavity 31 is greater than the length of the second cavity 32. The longer length of the first cavity 31 increases the contact length with the drum component 11, improves the stability of the connection between the two, and reduces vibration caused by insufficient contact area during operation. At the same time, the longer first cavity 31 provides a longer guide stroke for the installation of the drum component 11, further improving the assembly accuracy. The shorter length of the second cavity 32 shortens the overall length of the mandrel 30 while ensuring the transition function, making the equipment structure more compact.

[0030] In some embodiments, please refer to the following for details. Figure 2 The inner wall of the first cavity 31 is provided with a plurality of first openings 34, and the inner wall of the second cavity 32 is provided with a plurality of second openings 35; wherein, the inside of the mandrel 30 is provided with an oil injection channel 38, the oil injection channel 38 is connected to the first openings 34 and the second openings 35, and high pressure medium is injected to generate axial thrust, pushing the shaft out of the sleeve.

[0031] High-pressure medium enters the first opening 34 and the second opening 35 through the oil injection channel 38, and is ejected from the inner walls of the first cavity 31 and the second cavity 32, forming hydraulic thrust. This facilitates the separation between the inner wall of the first cavity 31 and the outer wall of the drum component 11, and also facilitates the separation between the inner wall of the second cavity 32 and the outer wall of the drum component 11. At the same time, the inner wall of the second cavity 32 has a larger slope, and the ejected high-pressure medium can generate a larger axial force, further promoting the rapid separation between the drum component 11 and the spindle 30, and improving the disassembly efficiency of the drum component 11 and the spindle 30.

[0032] Specifically, the high-pressure medium can be dry oil or hydraulic oil; this is just an example and not a specific limitation.

[0033] In some embodiments, a plurality of first openings 34 are distributed circumferentially along the first cavity 31, and a plurality of second openings 35 are distributed circumferentially along the second cavity 32. The circumferentially uniformly distributed first openings 34 and second openings 35 make the force more balanced when the high-pressure medium is ejected, effectively avoiding deformation or damage to the drum component 11 due to local stress concentration during the separation process; at the same time, multi-point synchronous pressure ensures uniform transmission of axial thrust, improving the stability and controllability of the disassembly process.

[0034] In some embodiments, please refer to the following for details. Figure 2Furthermore, multiple first openings 34 are distributed along the axial direction of the first cavity 31, with the distribution density of the first openings 34 in the region closer to the second cavity 32 being greater than that in the region farther from the second cavity 32. This distribution design allows the high-pressure medium to be released in a concentrated manner near the transition region, enhancing the force near the second cavity 32 and effectively overcoming the clamping effect of the drum component 11 caused by structural changes in this area, thereby achieving more efficient separation of the drum component 11 from the mandrel 30.

[0035] In some embodiments, please refer to the following for details. Figure 1 The inner wall of the first cavity 31 is a first conical surface, and the inner wall of the second cavity 32 is a second conical surface. The taper of the first conical surface is 1 / 20 to 1 / 18, and the taper of the second conical surface is 1 / 2 to 1. It can be understood that the taper of the second conical surface should be less than 1, but can be greater than or equal to 1 / 2; the taper of the first conical surface is greater than or equal to 1 / 20, and less than or equal to 1 / 18.

[0036] Understandably, the first conical surface has a taper of 2H1 / L1, and the second conical surface has a taper of 2H2 / L2. The first conical surface uses a small taper design. The smaller the taper, the gentler the inclination angle of the conical surface, the larger the mating surface with the drum, the higher the positioning accuracy, and the more uniform the pressure distribution on the mating surface. This allows for more stable torque transmission and avoids relative slippage during operation, meeting the requirements of high-precision working conditions. At the same time, the taper of the first conical surface cannot be too small, otherwise the processing difficulty will increase significantly, and a small taper will have limited effect on improving positioning accuracy. The second conical surface uses a large taper design. The larger the taper, the larger the inclination angle. When disassembling the drum, the same force can generate a larger axial thrust, making it easier for the drum to detach from the mandrel 30, greatly improving the ease of disassembly. The differentiated design of the two tapers takes into account both positioning accuracy and disassembly convenience, achieving an optimized balance of functions.

[0037] In some embodiments, please refer to the following for details. Figure 1 , Figure 2 The inner wall of any one or more of the first cavity 31, the second cavity 32, and the third cavity 33 is provided with a first keyway 36 for connection with the winding drum component 11. The first keyway 36 forms a key connection between the mandrel 30 and the winding drum component 11. The key connection has the characteristics of large torque transmission and precise positioning, which can further enhance the connection reliability between the two, avoid relative rotation during operation, and ensure the stability of power transmission. At the same time, the key connection and the conical surface form a dual positioning and transmission guarantee, further improving the transmission accuracy and adapting to the requirements of high-speed and high-precision winding / unwinding. Multiple cavities can be provided with keyways, and appropriate connection parts can be selected according to the structural characteristics of the winding drum, improving the versatility and adaptability of the mandrel 30.

[0038] Preferably, the first keyway 36 is disposed on the inner wall of the first cavity 31, so as to be closer to the mounting end of the drum component 11, thereby improving the connection rigidity and torque transmission efficiency, while avoiding stress concentration caused by the keyway being disposed in a large taper area.

[0039] In some embodiments, please refer to the following for details. Figure 1 , Figure 2 The direct-drive motor 10 for the drum also includes a bearing housing 40 and a cooling pipe 50. The bearing housing 40 includes a bearing 41 and a housing 42. The bearing 41 is sleeved on the end of the spindle 30 and coaxially arranged with the spindle 30. The housing 42 is sleeved on the outside of the bearing 41, and the cooling pipe 50 flows through the housing 42. The bearing 41 provides support for the rotation of the spindle 30, reducing frictional resistance during rotation, improving the rotational accuracy and stability of the spindle 30, and preventing drum operation deviation due to spindle 30 oscillation. As the direct load-bearing body of the drum component 11, the spindle 30, and the bearing 41 corresponding to the spindle 30, also bear significant radial and axial loads during operation. Therefore, the bearing 41 generates considerable heat. Heat accumulation will affect the accuracy of the bearing 41 and may even lead to failure. The cooling pipe 50, flowing through the housing 42, can promptly remove the heat generated by the bearing 41 during operation, effectively controlling the bearing 41 temperature and maintaining its working accuracy and lifespan.

[0040] In some embodiments, the cooling pipes 50 are arranged in a spiral manner inside the housing 42 to increase the heat dissipation contact area and improve cooling efficiency.

[0041] In some embodiments, please refer to the following for details. Figure 1 , Figure 2 The cooling pipe 50 also flows through the stator assembly 22, further expanding the cooling range and providing targeted cooling to key stress-bearing parts. This effectively prevents the decline in electromagnetic performance and thermal deformation of materials caused by temperature rise, ensuring the stability and reliability of the motor under continuous high load operation. The cooling pipe 50 also reduces the winding operating temperature while cooling the stator assembly 22, delaying insulation aging, extending the service life of the motor, and further improving the overall durability and safety of the system.

[0042] In some embodiments, please refer to the following for details. Figure 1 , Figure 2 , Figure 3 The end of the spindle 30 is provided with a first annular groove 37; the direct drive motor 10 of the drum also includes a locking flange ring 60 detachable from the spindle 30, the locking flange ring 60 is sleeved on the end of the spindle 30, and the inner side of the locking flange ring 60 is provided with a first annular protrusion 61 that cooperates with the first annular groove 37.

[0043] The engagement of the first annular protrusion 61 and the first annular groove 37 achieves axial positioning between the locking flange ring 60 and the mandrel 30, effectively limiting the axial movement of the drum and ensuring its stable position during winding / unwinding. This avoids problems such as uneven edges and tension fluctuations caused by axial movement, thus improving winding accuracy. Simultaneously, the engagement structure of the first annular protrusion 61 and the first annular groove 37 is simple and reliable, capable of withstanding significant axial forces and ensuring the stability of equipment operation. The locking flange ring 60 and the mandrel 30 are detachably connected, facilitating installation and maintenance. Furthermore, they maintain good coaxiality and structural rigidity even under high-speed conditions, effectively suppressing vibration and off-center loading, further enhancing operational stability and equipment reliability.

[0044] For details, please refer to [link / reference]. Figure 3 The locking flange ring 60 can be designed as a split structure, including a first split part 62 and a second split part. The first split part 62 and the second split part are connected by bolts. During assembly, the first split part 62 and the second split part of the locking flange ring 60 can be respectively sleeved on the end of the mandrel 30, and then the two can be fastened together by bolts, so that the first annular protrusion 61 is completely embedded in the first annular groove 37, realizing a reliable connection between the locking flange ring 60 and the mandrel 30. During disassembly, the bolts can be loosened to separate the first split part 62 and the second split part.

[0045] Combination Figure 4 The present invention also provides a winding device 70, including a direct drive motor 10 for a drum as described above and a drum component 11.

[0046] For the specific structure of the direct drive motor 10, please refer to any of the above embodiments and accompanying drawings, and it will not be described again here.

[0047] Specifically, a portion of the drum component 11 is installed in the hollow cavity of the spindle 30 of the drum direct drive motor 10 and is axially pressed and fixed by the locking flange ring 60. The first connecting key on the drum component 11 cooperates with the first keyway 36 on the spindle 30 to achieve circumferential limiting, ensuring that there is no relative sliding during transmission.

[0048] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A direct-drive motor for a drum, characterized in that, include: Rotor assembly (21); The stator assembly (22) is located outside the rotor assembly (21) and is coaxially arranged with the rotor assembly (21); The mandrel (30) passes through the center of the rotor assembly (21) and is fixedly connected to the rotor assembly (21) and rotates synchronously. The mandrel (30) is provided with a hollow cavity, which is used to be inserted into the drum component (11). The hollow cavity includes a first cavity (31), a second cavity (32), and a third cavity (33). The first cavity (31), the second cavity (32), and the third cavity (33) are sequentially distributed along the axial direction of the mandrel (30) and pass through the mandrel (30). The first cavity (31) is close to the output end of the direct drive motor of the drum. In the arrangement direction of the first cavity (31), the second cavity (32), and the third cavity (33), the inner diameter of the first cavity (31) gradually decreases, the inner diameter of the second cavity (32) gradually decreases, the slope of the inner wall of the first cavity (31) is less than the slope of the inner wall of the second cavity (32), and the inner diameter of the third cavity (33) remains unchanged. The minimum inner diameter of the first cavity (31) is equal to the maximum inner diameter of the second cavity (32), and the minimum inner diameter of the second cavity (32) is equal to the inner diameter of the third cavity (33).

2. The direct-drive drum motor according to claim 1, characterized in that, In the arrangement direction along the first cavity (31), the second cavity (32) and the third cavity (33), the length of the first cavity (31) is greater than the length of the second cavity (32).

3. The direct-drive drum motor according to claim 2, characterized in that, The inner wall of the first cavity (31) is provided with a plurality of first openings (34), and the inner wall of the second cavity (32) is provided with a plurality of second openings (35). The spindle (30) has an oil injection channel (38) inside, which is connected to the first opening (34) and the second opening (35).

4. The direct-drive drum motor according to claim 3, characterized in that, Multiple first openings (34) are distributed circumferentially along the first cavity (31), and multiple second openings (35) are distributed circumferentially along the second cavity (32).

5. The direct-drive drum motor according to claim 4, characterized in that, The first openings (34) are also distributed along the axial direction of the first cavity (31), and the distribution density of the first openings (34) in the region closer to the second cavity (32) is greater than the distribution density of the first openings (34) in the region farther away from the second cavity (32).

6. The direct-drive drum motor according to claim 1, characterized in that, The inner wall of the first cavity (31) is a first conical surface, and the inner wall of the second cavity (32) is a second conical surface. The taper of the first conical surface is 1 / 20 to 1 / 18, and the taper of the second conical surface is 1 / 2 to 1.

7. The direct-drive drum motor according to claim 1, characterized in that, The inner wall of any one or more of the first cavity (31), the second cavity (32) and the third cavity (33) is provided with a first keyway (36) for connecting with the roll component (11).

8. The direct-drive motor for a drum according to claim 1, characterized in that, The drum direct drive motor also includes a bearing housing (40) and a cooling pipe (50). The bearing housing (40) includes a bearing (41) and a housing (42). The bearing (41) is sleeved on the end of the spindle (30) and coaxially arranged with the spindle (30). The housing (42) is sleeved on the outside of the bearing (41). The cooling pipe (50) flows through the housing (42).

9. The direct-drive drum motor according to claim 1, characterized in that, The end of the mandrel (30) is provided with a first annular groove (37). The direct drive motor for the drum also includes a locking flange ring (60) detachable from the spindle (30). The locking flange ring (60) is sleeved on the end of the spindle (30), and the inner side of the locking flange ring (60) is provided with a first annular protrusion (61) that cooperates with the first annular groove (37).

10. A winding device, characterized in that, It includes a drum direct drive motor as described in any one of claims 1 to 9 and a drum component (11).

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