A driving device of a laundry treating apparatus and a laundry treating apparatus

Abstract

The utility model provides a kind of driving device of clothes processing equipment and clothes processing equipment, the device is composed of motor and motor transmission gear;Motor can drive multiple barrels in a clothes processing equipment to rotate by motor transmission gear;By the driving device of clothes processing equipment and clothes processing equipment of the utility model, the structure of clothes processing equipment can be optimized, the structure setting of damping system in clothes processing equipment is simplified, and the cost of clothes processing equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and more specifically, to a drive device and clothing processing equipment for clothing processing. Background Technology

[0002] Common laundry equipment includes front-loading washing machines. In current multi-drum washing machine designs, the mechanical structure faces significant challenges in simultaneously achieving the goals of separate washing and space saving. Particularly in some existing multi-drum solutions, the traditional cabinet components are typically assembled from sheet metal through stamping, resulting in inherent deficiencies in overall structural rigidity.

[0003] To ensure the dynamic stability of each drum during the washing process, each drum assembly must be equipped with an independent shock absorption system (typically including suspension springs and shock absorbers) connecting its outer drum to the casing. While this complex shock absorption architecture effectively suppresses vibration, it also brings significant drawbacks:

[0004] First, it takes up a lot of valuable space inside the washing machine cabinet, limiting the possibility of adding more washing drums within a given external size, and severely restricting the product's multi-drum expansion potential;

[0005] Secondly, the number of parts increases dramatically due to the multiple independent drive motors (whether direct drive or belt drive) and the corresponding shock absorption system, making the overall structure complex, costly, and the control logic cumbersome (requiring coordinated or independent control of multiple motors).

[0006] Therefore, it is of great significance to study how to simplify the structure of clothing processing equipment, improve the space utilization rate within the clothing processing equipment, and reduce the cost of clothing processing equipment. Utility Model Content

[0007] In view of this, the present invention aims to propose a driving device and method for a garment processing equipment, as well as a garment processing equipment, to solve the problems existing in the prior art where the traditional garment processing equipment has a complex shock absorption structure inside the housing, which easily occupies a large amount of housing space, thus limiting the expansion of multiple cylinders, and has multiple independent drive motors for control, which easily increases the complexity and cost of the whole machine; thereby optimizing the structure of the garment processing equipment, simplifying the structural setting of the shock absorption system in the garment processing equipment, and reducing the cost of the garment processing equipment.

[0008] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0009] This utility model relates to a driving device and method for a garment processing equipment, and a garment processing equipment. The driving device for the garment processing equipment consists of a motor and a motor transmission gear; the motor can drive multiple cylinders in a garment processing equipment to rotate through the motor transmission gear.

[0010] Furthermore, the motor drive gear includes multiple gear rings, and the motor can control the motor drive gear to move back and forth. The movement of the motor drive gear can control the movement of multiple driven wheel assemblies on the inner cylinder.

[0011] Furthermore, when two inner cylinders are provided, the gear rings include a large gear ring and a small gear ring. Under the action of the motor, the relative back-and-forth movement of the large gear ring and the small gear ring can drive the corresponding inner cylinder to change speed.

[0012] Furthermore, the tooth width of the large gear ring is a mm, and the tooth width of the small gear ring is b mm, where a and b are both positive numbers, and a > b.

[0013] Furthermore, the device includes a speed-changing wheel, which is located between the motor drive gear and the driven wheel assemblies on different inner cylinders. The speed-changing wheel is rotatably located on the outer wall of the driven wheel assembly. The outer wall of the end of the speed-changing wheel away from the driven wheel assembly meshes with the motor drive gear, thereby enabling the motor to control the motor drive gear to drive the different inner cylinders to rotate at different speeds.

[0014] Furthermore, the equipment also includes a transmission gear shaft. One end of the motor is located on the front side of the back panel of the housing, and the other end of the motor drives the motor transmission gear to move back and forth through the transmission gear shaft.

[0015] Furthermore, the transmission gear shaft can be made using a sliding lead screw.

[0016] A garment processing device includes a drive unit for the garment processing device, the drive unit being disposed within the device.

[0017] Furthermore, the device includes at least one inner cylinder.

[0018] Furthermore, the equipment includes three inner cylinders: a small first cylinder, a small second cylinder, and a large cylinder. Under the action of the motor, the required speed is achieved by the small first cylinder, the small second cylinder, and the large cylinder engaging or disengaging with different gear rings of the motor drive gear.

[0019] Furthermore, the equipment's housing is formed into multiple cavities through integral die casting. Each cavity includes multiple cylindrical cavities, and each cylindrical cavity contains three inner cylinders. The three inner cylinders are driven by a drive device.

[0020] Compared with the prior art, the driving device and method for garment processing equipment and the garment processing equipment described in this utility model have the following beneficial effects:

[0021] By setting up the aforementioned drive device, the structure of the garment processing equipment can be effectively optimized, the structural design of the shock absorption system in the garment processing equipment can be simplified, and the cost of the garment processing equipment can be reduced. Attached Figure Description

[0022] The accompanying drawings, which constitute a part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments and descriptions of the utility model are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a schematic diagram of the drive unit's structure inside the housing;

[0024] Figure 2 A first-person perspective schematic diagram of the integral die-cast structure of the inner cylinder and the box body;

[0025] Figure 3 A second-view schematic diagram of the integral die-cast structure of the inner cylinder and the box body;

[0026] Figure 4 This is a schematic diagram of the gear ring structure.

[0027] Explanation of reference numerals in the attached drawings: 1. Motor; 2. Motor transmission gear; 21. Gear ring; 211. Large gear ring; 212. Small gear ring; 11. Transmission gear shaft; 30. Driven gear assembly; 301. Driven gear; 302. Driven shaft; 3. Inner cylinder; 31. Small first cylinder; 32. Small second cylinder; 33. Large cylinder; 4. Housing; 5. Connecting piece; 51. Cylinder housing connecting piece; 52. Inter-cylinder connecting piece; 6. Receiving cavity; 60. Cylinder housing cavity. Detailed Implementation

[0028] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to convey the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To address the problems of existing garment processing equipment, such as complex shock-absorbing structures within the housing that occupy significant space and limit multi-tube expansion, and the increased complexity and cost due to multiple independent drive motors, this embodiment proposes a driving device and method for garment processing equipment. The driving device comprises a motor 1 and a motor transmission gear 2. The motor 1 drives multiple tubes within the garment processing equipment to rotate via the motor transmission gear 2. The equipment also includes a driven wheel assembly 30. The motor 1 is located on the front side of the back plate of the housing 4, and the driven wheel assembly 30 is disposed on the outer rear end wall of the output shaft of the inner tube 3 within the housing 4. In this embodiment, "multiple tubes" refers to at least two or more inner tubes 3. The number of driven wheel assemblies 30 corresponds to the number of inner tubes 3.

[0033] By setting up the aforementioned drive device, the structure of the garment processing equipment can be effectively optimized, the structural design of the shock absorption system in the garment processing equipment can be simplified, and the cost of the garment processing equipment can be reduced.

[0034] The motor drive gear 2 includes multiple gear rings 21, which mesh with different driven wheel assemblies 30 on different inner cylinders 3. The motor 1 can control the motor drive gear 2 to move back and forth, and the movement of the motor drive gear 2 can control the movement of the driven wheel assemblies 30 on multiple inner cylinders 3. "Multiple" refers to two or more. The thickness and tooth width of the different gear rings 21 are set according to requirements. In this embodiment, at least one motor drive gear 2 is provided. Multiple gear rings 21 can be selectively provided on one motor drive gear 2 to drive different numbers of inner cylinders 3, or multiple motor drive gears 2 can be provided, with a required gap maintained between any two motor drive gears 2, thereby enabling different inner cylinders 3 to operate at varying speeds through the back-and-forth movement of different motor drive gears 2.

[0035] By selectively configuring the structure of the motor drive gear 2, the flexibility of the drive device can be effectively improved, the control sensitivity of the drive device can be enhanced, and the stability and reliability of different inner cylinders 3 during operation can be ensured by setting the tooth width as needed. Furthermore, by setting different motor drive gears 2, torque can be precisely and synchronously distributed to each designated inner cylinder 3, realizing a "one-to-many" architecture; thus effectively achieving power splitting and precise distribution. In addition, the positions of the inner cylinders 3 can be decoupled, allowing the rotation center axes of each inner cylinder 3 to not be strictly aligned on a straight line through multiple independent motor drive gears 2. Therefore, the layout of the inner cylinders 3 can be more flexible and free; for example, they can be staggered vertically, arranged side by side, or arranged at a certain angle around the motor 1; thus greatly improving the flexibility of the layout and the utilization rate of the internal space of the equipment. Moreover, torque and speed can be optimized to adapt to different user needs. It can also enhance the rigidity and transmission accuracy of the system, reducing vibration, noise, and energy loss caused by deformation of the drive gear shaft 11. It is also more conducive to realizing independent control and function switching of different inner cylinders 3. This improves the maintainability and modularity of the system; that is, if a certain transmission component fails, a specific module can be repaired or replaced without disassembling the entire drive unit, which greatly reduces the complexity and cost of later maintenance.

[0036] Preferably, when two inner cylinders 3 are provided, the gear ring 21 includes a large gear ring 211 and a small gear ring 212. Under the action of the motor 1, the relative forward and backward movement of the large gear ring 211 and the small gear ring 212 can drive the corresponding inner cylinder 3 to change speed. The tooth width of the large gear ring 211 is a mm, and the tooth width of the small gear ring 212 is b mm, where a and b are both positive numbers, and a > b.

[0037] By differentiating between the large gear ring 211 and the small gear ring 212, it is possible to ensure that the two inner cylinders 3 can achieve variable speed movement under the drive of the same motor 1. This simplifies the device structure, enhances its functionality, and allows for greater flexibility in driving the rotation of different inner cylinders 3.

[0038] Preferably, the device includes a speed-changing wheel, which is located between the motor drive gear 2 and the driven wheel assembly 30 on different inner cylinders 3. The speed-changing wheel is located on the outer wall of the driven wheel assembly 30 in a rotatable manner. The outer wall of the end of the speed-changing wheel away from the driven wheel assembly 30 meshes with the motor drive gear 2, so that the motor 1 controls the motor drive gear 2 to drive the different inner cylinders 3 to achieve speed-changing rotation.

[0039] By using a variable-speed wheel, the rotation speed of different inner cylinders 3 can be differentiated from that of multiple gear rings 21, which drive different gears 3 at varying or uniform speeds. This allows for higher precision requirements on the motor drive gear 2. Positioning the variable-speed wheel between the motor drive gear 2 and the driven gear assemblies 30 on the different inner cylinders 3 simplifies the structure of the motor drive gear 2, making it suitable for different equipment needs. This more user-friendly configuration improves user satisfaction.

[0040] The device also includes a transmission gear shaft 11. One end of the motor 1 is located on the front side of the back plate of the housing 4, and the other end of the motor 1 drives the motor transmission gear 2 to move back and forth via the transmission gear shaft 11. The transmission gear shaft 11 can be a sliding lead screw. Specifically, the inner wall of the motor transmission gear 2 is in contact with the transmission gear shaft 11 in a way that allows it to slide back and forth, and the outer wall of the motor transmission gear 2 engages or disengages with the outer wall of the driven wheel assembly 30. Furthermore, the transmission gear shaft 11 is cylindrical. The outer wall of the transmission gear shaft 11 is a smooth arc surface or a threaded structure; in this embodiment, the specific type of the outer wall of the transmission gear shaft 11 is determined according to requirements.

[0041] By employing different structural configurations of the transmission gear shaft 11, the forward and backward movement of the motor transmission gear 2 can be effectively achieved under the action of the transmission gear shaft 11 and the motor 1. This differs from existing belt drive methods, effectively extending the service life of the device and ensuring its operational stability. Furthermore, the motor 1 enables axial extension or rotation of the transmission gear shaft 11. The coordinated configuration of the transmission gear shaft 11 and the motor 1 effectively simplifies the structure of the drive device, reduces its cost, and significantly reduces the number of motors 1, replacing the traditional "one motor per cylinder" configuration in multi-cylinder designs. This significantly reduces material procurement, inventory management, and assembly costs. Moreover, the electrical control system in the equipment only needs to precisely control the speed and direction of a single motor 1 to synchronously drive all inner cylinders 3. This greatly simplifies the hardware circuitry (such as the inverter module) and software algorithms of the controller, eliminating the need to handle complex coordination, synchronization, and anti-interference issues between multiple motors 1, reducing development difficulty and the cost of the electronic control unit (ECU). It also enables unified energy supply, requiring only one power supply and drive circuit serving a single motor 1, optimizing energy efficiency management. Furthermore, it enables synchronized motion, with all inner cylinders 3 originating from the same main shaft (or rigidly connected via a gear system). This ensures, theoretically, absolute speed synchronization among all inner cylinders 3. Whether rotating forward, reverse, or undergoing high-speed dehydration simultaneously, all inner cylinders 3 move in perfect unison. This, in turn, helps eliminate resonance generated when multiple motors 1 move together. In a multi-motor 1 independent drive system, even with high control precision for each motor 1, slight speed differences exist. These differences can cause the motion of the inner cylinders 3 to couple, generating low-frequency "beat frequency" vibrations and exacerbating overall machine shaking. Single-motor 1 drive fundamentally eliminates this problem, resulting in smoother overall operation of the drive unit. It also significantly improves the space utilization within the equipment, enhancing its performance and energy efficiency, maximizing the use of the power source, and avoiding potential energy losses when using multiple motors 1. This achieves higher torque and power density, enhancing the overall performance of the equipment.

[0042] The driven gear assembly 30 consists of a driven gear 301 and a driven shaft 302. The driven gear 301 is connected to the inner cylinder 3 via the driven shaft 302, and the outer wall of the driven gear 301 meshes with or separates from the outer wall of the motor drive gear 2. When there are two or more driven gears 301, the lengths of the driven shafts 302 corresponding to different driven gears 301 are different, and the diameters of the different driven gears 301 are also different; or the diameters of the different driven gears 301 are the same, depending on the requirements. This is used to facilitate the motor 1 to differentiate and control the rotation of different inner cylinders 3 at corresponding frequencies.

[0043] By differentiating the diameter of the driven gear 301 and the size of the driven shaft 302 within the driven wheel assembly 30, different motor transmission gears 2 can be effectively matched to achieve the required rotation of the inner cylinder 3 under the action of the same motor 1. This also helps to greatly optimize the layout of each component in the equipment while simplifying the structure of the driven wheel assembly 30, thereby improving the space utilization within the equipment. Furthermore, it can improve the transmission efficiency and stability of the drive device, enhancing its reliability, safety, and maintainability.

[0044] Preferably, when two inner cylinders 3 are provided, such as Figure 2 As shown, the garment processing equipment has two inner drums 3 and two driven wheel assemblies 30. The driven shafts 302 in the two driven wheel assemblies 30 have different lengths. The driven gears 301 in the two driven wheel assemblies 30 have different diameters. The shortest distance between the outer walls of the driven gears 301 in the two driven wheel assemblies 30 and the straight line containing the transmission gear shaft 11 is the same. At this time, there are two motor drive gears 2, which are mounted on the transmission gear shaft 11. There is a certain gap between the two motor drive gears 2.

[0045] Working principle: Under the action of motor 1, two motor transmission gears 2 can be driven to move relative to each other and in opposite directions. When the motor transmission gear 2 meshes with the driven gear 301, it can drive the corresponding inner cylinder 3 to rotate at the required frequency. When the two inner cylinders 3 rotate simultaneously, both motor transmission gears 2 need to mesh with the driven gear 301 of the corresponding inner cylinder 3, so that the same motor 1 can drive the two inner cylinders 3 to move simultaneously. When it is necessary to adjust the movement mode, the motor transmission gears 2 can be controlled by motor 1 to move back and forth, thereby adjusting the movement of the inner cylinder 3.

[0046] In this embodiment, the number of inner cylinders 3 is set as needed, and the working principle is the same as the operation mode of the two inner cylinders 3 in the example above. At least one set of motors 1 is set according to the required parameters. The specific setting depends on the requirements.

[0047] By utilizing the size differences between the components in the different driven wheel assemblies 30 within the multiple inner cylinders 3, the same motor 1 can effectively control multiple inner cylinders 3 to operate on demand. It can also effectively improve the space utilization rate in the equipment and ensure that each component can be reasonably distributed and arranged in the equipment.

[0048] A garment processing device includes a drive unit for the garment processing device, the drive unit being disposed within the device. The device includes at least one inner cylinder 3. The size of the inner cylinder 3 is set as required. Preferably, the device includes three inner cylinders 3, comprising a small cylinder 31, a small second cylinder 32, and a large cylinder 33; the small cylinder 31 and the small second cylinder 32 are both located above the large cylinder 33. The small cylinder 31, the small second cylinder 32, and the large cylinder 33 are all located within the receiving cavity 6 of the housing 4, and the outer diameter of the small cylinder 31 and the small second cylinder 32 is less than the outer diameter of the large cylinder 33. Under the action of a motor 1, the desired speed is achieved by the small cylinder 31, the small second cylinder 32, and the large cylinder 33 engaging or disengaging with different gear rings 21 of the motor drive gear 2.

[0049] By coordinating the three inner cylinders 3 with the drive unit, the performance of the drive unit can be effectively improved, and its cost reduced. Furthermore, the flexibility of the drive unit's layout can be increased. Moreover, the meshing and disengagement of gears can disperse the enormous impact generated during the starting, stopping, and speed changes of the motor 1, greatly reducing the stress on the transmission gear shaft 11 and helping to extend the life of the gearbox.

[0050] The equipment housing 4 is integrally die-cast to form multiple receiving cavities 6. These cavities 6 serve to reduce vibration and noise, and also help reduce the overall weight of the equipment, thus lowering manufacturing costs. Each receiving cavity 6 includes multiple cylindrical receiving cavities 60, each accommodating three inner cylinders 3, which are driven by a drive device. Connecting members 5 exist between the different receiving cavities 6. The drive device is located in the cavity between the rear side of the housing 4 and its back plate. The cylindrical receiving cavities 60 are integrally die-cast with the housing 4 via connecting members 5. The connecting members 5 are smoothly and arc-shapedly connected to both the cylindrical receiving cavities 60 and the housing 4. The back plate of the housing 4 is detachably located at its rear end.

[0051] Unlike traditional methods where the inner cylinder 3 is suspended from the housing 4 via springs and dampers, which can lead to significant vibration and noise during operation and cause wear and tear on the springs due to prolonged use, this application integrally die-casts the inner cylinder cavity 60 with the housing 4. This creates a rigid whole between the inner cylinder cavity 60 and the housing 4, while the damping cavity 6 helps neutralize the excitation frequency. Even if vibration occurs during operation, the presence of at least one cavity 6 effectively reduces vibration and noise, and also decreases damping between components. Furthermore, it eliminates the need for springs and dampers, significantly reducing equipment costs and extending its lifespan. This also improves the stability and reliability of the connection between the housing 4 and the inner cylinder 3.

[0052] The connecting component 5 in the equipment consists of a cylindrical cavity connector 51 and an inter-cylinder connector 52. The cylindrical cavity connector 51 is located between the cylindrical cavity 60 and the box body 4, and is smoothly connected to both the inner cylinder 3 and the box body 4. It serves to achieve a stable connection between the cylindrical cavity 60 and the box body 4, providing support and vibration damping / noise reduction. The inter-cylinder connector 52 is located between the outer walls of any two cylindrical cavities 60, and is smoothly connected to the connected cylindrical cavities 60 via a circular arc. It is used to improve the strength and structural stability of the cylindrical cavity 60 and the box body 4 after integral die-casting. There are p cylindrical cavity connectors 51, where p is a positive integer. p ≥ m; there are q inter-cylinder connectors 52, where q is a positive integer. q ≥ 1. In this embodiment, the specific values ​​of p and q are set according to requirements. Furthermore, the outer wall of the cylindrical cavity connector 51 consists of three arc edges and one straight edge. The outer wall of the inter-cylinder connector 52 consists of four arc edges.

[0053] Unlike existing multi-drum washing machine applications where the rigidity of the cabinet 4 component is insufficient, requiring a shock-absorbing system to connect the inner drum 3 of each drum component to the cabinet 4, thus limiting its multi-drum scalability within existing dimensions, this application adopts an integrated die-cast cabinet 4 and drum housing cavity 60. Control of all inner drums 3 is achieved through a motor 1 structure fixed to the back plate of the cabinet 4, simplifying the driving method and control logic. Furthermore, the installation of the drum-cabinet connector 51 and the inter-drum connector 52 effectively improves the stability of the connection between the drum housing cavity 60 and the cabinet 4, and between any two drum housing cavities 60. The arc edges on the outer walls of the drum-cabinet connector 51 and the inter-drum connector 52 also provide a damping effect and enhance the rigidity of the drum-cabinet connector 51 and the inter-drum connector 52.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A driving device for a garment processing equipment, characterized in that, The device consists of a motor (1) and a motor drive gear (2); the motor (1) can drive multiple cylinders in a garment processing device to rotate through the motor drive gear (2).

2. The driving device for a garment processing equipment according to claim 1, characterized in that, The motor drive gear (2) includes multiple gear rings (21). The motor (1) can control the motor drive gear (2) to move back and forth. The movement of the motor drive gear (2) can control the driven wheel assemblies (30) on multiple inner cylinders (3) to move.

3. The driving device for a garment processing equipment according to claim 2, characterized in that, When two inner cylinders (3) are provided, the gear ring (21) includes a large gear ring (211) and a small gear ring (212). Under the action of the motor (1), the relative front-to-back movement of the large gear ring (211) and the small gear ring (212) can drive the corresponding inner cylinder (3) to change speed.

4. The driving device for a garment processing equipment according to claim 3, characterized in that, The tooth width of the large gear ring (211) is a mm, and the tooth width of the small gear ring (212) is b mm, where a and b are both positive numbers, and a > b.

5. The driving device for a garment processing equipment according to claim 1, characterized in that, The device includes a speed-changing wheel, which is located between the motor drive gear (2) and the driven wheel assembly (30) on different inner cylinders (3). The speed-changing wheel is located on the outer wall of the driven wheel assembly (30) in a rotatable manner. The outer wall of the end of the speed-changing wheel away from the driven wheel assembly (30) meshes with the motor drive gear (2), so that the motor (1) controls the motor drive gear (2) to drive the different inner cylinders (3) to achieve speed-changing rotation.

6. The driving device for a garment processing apparatus according to claim 1, characterized in that, The device also includes a transmission gear shaft (11), one end of the motor (1) is located on the front side of the back plate of the housing (4), and the other end of the motor (1) drives the motor transmission gear (2) to move back and forth through the transmission gear shaft (11).

7. The driving device for a garment processing apparatus according to claim 6, characterized in that, The transmission gear shaft (11) can be a sliding lead screw.

8. A garment processing device, characterized in that, The device includes a drive mechanism for a garment processing apparatus according to any one of claims 1-7, the mechanism being disposed within the apparatus.

9. The garment processing equipment according to claim 8, characterized in that, The device includes at least one inner cylinder (3).

10. A garment processing device according to claim 9, characterized in that, The device includes three inner cylinders (3), which include a small cylinder (31), a small cylinder (32), and a large cylinder (33). Under the action of the motor (1), the required speed is achieved by the small cylinder (31), the small cylinder (32), and the large cylinder (33) engaging or disengaging with different gear rings (21) of the motor transmission gear (2).

11. The garment processing device according to claim 8, characterized in that, The housing (4) of the device is formed by integral die casting to form multiple accommodating cavities (6). The accommodating cavities (6) include multiple cylindrical accommodating cavities (60). Each cylindrical accommodating cavity (60) accommodates three inner cylinders (3). The three inner cylinders (3) are driven by a driving device.

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