Design method and power device of a cigarette pack wrapping wheel

Abstract

The present application relates to the technical field of packaging machinery, and particularly relates to a design method of a power device of a cigarette package packaging wheel and the power device, the cigarette package packaging wheel has N workstations, each workstation corresponds to a preset stop time, the design method comprises the following steps: a crank rocker structure is constructed by using four switching points A, B, C and D; a first gear is arranged at the switching point B, the first gear is fixedly connected with the crank, a second gear is coaxially arranged at the switching point C, a third gear is rotatably arranged at the switching point D, and an internal gear is coaxially arranged at the switching point A; a first motor and a second motor are arranged at the switching point A, the first motor is in transmission connection with the crank to drive the crank to rotate in a first rotation direction, and the second motor is in transmission connection with the internal gear; a motion curve of the internal gear controlled by the second motor is determined according to the preset stop time, so that the rotating rod stops rotating for the preset time. The present application can realize high-precision control by using a common motor, and meets the needs of trademark paper packaging.

Description

Technical Field

[0001] This invention relates to the field of packaging machinery technology, and in particular to a design method and a power device for a cigarette pack packaging wheel. Background Technology

[0002] Tobacco label paper packaging is an important component of cigarette products, serving not only the functions of brand identification and product protection, but also integrating multiple attributes such as anti-counterfeiting, cultural significance, and environmental protection. During the cigarette manufacturing process, such as... Figure 1 As shown, the power structure for label packaging includes packaging wheels, which are powered by a conventional servo motor, a right-angle reducer, and a pair of gears. In existing technology, the packaging wheels have eight stations, with a 1:1 stop-start ratio for each station, and they pause for a certain period upon reaching the station. By precisely controlling the operation of the servo motor, label packaging at all eight stations can be achieved. Figure 2 It is an improved packaging wheel power system that uses direct motor drive, eliminating the need for a reducer and gear pair.

[0003] Both of these power systems require high-performance motors, but high-performance motors are expensive. While ordinary motors are inexpensive, they cannot meet the needs of high-precision control.

[0004] Therefore, a design method for the power unit of the cigarette pack packaging wheel is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a design method and a power device for a cigarette pack packaging wheel, which can achieve high-precision control using a common motor, thereby meeting the needs of trademark paper packaging.

[0006] To achieve this objective, the present invention adopts the following technical solution: A design method for the power unit of a cigarette packaging wheel, wherein the cigarette packaging wheel has N workstations, each workstation corresponding to a preset stop time, where N is an integer greater than or equal to 3, the design method includes the following steps: A crank-rocker structure is constructed using four transition points A, B, C, and D, where AB is the crank, BC is the connecting rod, CD is the rocker, and AD is the rotating rod. A first gear is set at transition point B, and the first gear is fixedly connected to the crank. A second gear is set coaxially at transition point C, a third gear is set rotatably at transition point D, and an internal gear is set coaxially at transition point A. The pitch circle diameters of the first gear, the third gear, and the internal gear are determined according to the number of work positions N, so that the first gear and the second gear mesh, the third gear meshes with the second gear, and the internal gear meshes with the third gear. A first motor and a second motor are provided at the transition point A. The first motor is connected to the crank drive to drive the crank to rotate in a first rotation direction, and the second motor is connected to the internal gear drive. The motion curve of the internal gear controlled by the second motor is determined based on the preset time of the stop, so that the rotating rod stops for the preset time.

[0007] In some embodiments, when the rotating rod deflects along the first rotation direction, the second motor is activated to drive the internal gear to rotate, thereby counteracting the deflection of the rotating rod and causing the rotating rod to stop for the preset time.

[0008] In some embodiments, when the rotating rod rotates in a second rotation direction opposite to the first rotation direction, the second motor is turned off, causing the internal gear to stop rotating.

[0009] In some embodiments, the pitch circle radius of the first gear is equal to the pitch circle radius of the third gear.

[0010] In some embodiments, the pitch circle radius of the first gear is equal to the length of the crank.

[0011] In some embodiments, the total transmission ratio from the first gear to the internal gear is equal to N.

[0012] In some embodiments, when the number of work stations N=4, the pitch circle diameter of the first gear: the pitch circle diameter of the internal gear = 1: 4, when the crank rotates 270° along the first rotation direction, the rotating rod stops rotating 100° accordingly, and the dynamic-to-stop ratio of the rotating rod is 1.7:1.

[0013] In some embodiments, when the number of work stations N=8, the pitch circle diameter of the first gear : the pitch circle diameter of the internal gear = 1 : 8.

[0014] In some embodiments, an angle detection element is provided at the output shaft of the second motor, and the angle detection element is electrically connected to the second motor.

[0015] The power unit includes a crank-rocker structure, a gear transmission structure, a first motor, and a second motor. The gear transmission structure includes a first gear, a second gear, a third gear, and an internal gear that mesh in sequence. The power unit is designed according to the design method of the power unit for the cigarette packing wheel described above.

[0016] The beneficial effects of this invention are: This invention provides a design method for a power device of a cigarette pack packaging wheel. A crank-rocker structure is constructed using four transition points A, B, C, and D. AB is the crank, BC is the connecting rod, CD is the rocker, and AD is the rotating rod. A first gear is fixedly connected to the crank at transition point B. A second gear is rotatably mounted coaxially at transition point C, a third gear is rotatably mounted at transition point D, and an internal gear is rotatably mounted coaxially at transition point A. The pitch circle diameters of the first, third, and internal gears are determined according to the number of workstations N, ensuring that the first and second gears mesh, the third gear meshes with the second gear, and the internal gear meshes with the third gear. A first motor and a second motor are located at transition point A. The first motor is driven by the crank to drive the crank to rotate in a first rotation direction, and the second motor is driven by the internal gear. The motion curve of the second motor controlling the internal gear is determined according to a preset stop time, so that the rotating rod stops for the preset time. In this system, the first motor drives the crank to rotate at a constant speed. The crank, through a connecting rod, drives the rocker arm to move. Simultaneously, the first gear drives the third gear to rotate through the second gear. The motion of the third gear is constrained by the internal gear. By determining the motion curve of the internal gear controlled by the second motor based on a preset stop time, when the second motor stops, the internal gear remains stationary while the rocker arm rotates, and the third gear rotates smoothly. When the second motor rotates, it drives the internal gear to rotate, thereby adjusting the position of the rocker arm to keep it stationary. Due to the use of a crank-rocker structure, this four-bar linkage has two dead points. When the transition point B is located on the line connecting or extending from the transition points A and C, the rocker arm is at its extreme swing angle. At this point, the rocker arm is stopped, allowing for the tobacco label packaging action. By determining the motion curve of the internal gear controlled by the second motor based on the preset stop time and controlling the rotation of the internal gear according to the motion curve, the rocker arm can be stopped for the preset time. Using the above method, the mechanical form of a four-bar linkage combined with a gear transmission structure allows for high-precision control using a common motor, thus meeting the needs of label packaging.

[0017] The present invention provides a power device comprising a crank-rocker structure, a gear transmission structure, a first motor, and a second motor. The power device is configured according to the design method of the power device for cigarette packing wheels described above, and can achieve high-precision control using ordinary motors, thereby meeting the needs of trademark paper packaging. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the dynamic structure of trademark paper packaging in the prior art; Figure 2 This is a schematic diagram of a power structure for trademark paper packaging that uses direct motor drive in the existing technology; Figure 3 This is a schematic diagram of a power device for a trademark paper packaging according to the present invention; Figure 4 (a) is a schematic diagram of the rotating rod at the zero point in this invention; Figure 4 (b) is a schematic diagram of the rotating rod swinging in the opposite direction in this invention; Figure 4 (c) is a schematic diagram of the rotating rod at its maximum reverse swing angle in this invention; Figure 4 (d) is a schematic diagram of the rotating rod swinging in the positive direction in this invention; Figure 4 (e) is a schematic diagram of the rotating rod in the three-point position in this invention; Figure 5 This is a motion process curve diagram of the four-position gear transmission structure in this invention; Figure 6 This is a graph showing the angular velocity of the rotating rod and the angular velocity of the internal gear in this invention. Figure 7 This is a graph showing the angular acceleration of the rotating rod and the angular acceleration of the internal gear in this invention.

[0020] In the picture: 1. Crank-rocker structure; 11. Crank; 12. Connecting rod; 13. Rocker; 14. Rotary rod; 2. Gear transmission structure; 21. First gear; 22. Second gear; 23. Third gear; 24. Internal gear. Detailed Implementation

[0021] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0022] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0023] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0024] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0025] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0026] In the process of packaging label paper, in order to achieve high-precision control using ordinary motors and thus meet the needs of label paper packaging, such as... Figures 3-7 As shown, this invention provides a design method for a power device of a cigarette packaging wheel. The cigarette packaging wheel has N workstations, each workstation corresponding to a preset stop time, where N is an integer greater than or equal to 3. The design method includes the following steps: A crank-rocker structure 1 is constructed with four transition points A, B, C, and D, where AB rod is the crank 11, BC rod is the connecting rod 12, CD rod is the rocker 13, and AD rod is the rotating rod 14. A first gear 21 is set at transition point B and is fixedly connected to crank 11. A second gear 22 is set coaxially at transition point C, a third gear 23 is set rotatably at transition point D, and an internal gear 24 is set coaxially at transition point A. The pitch circle diameters of the first gear 21, the third gear 23, and the internal gear 24 are determined according to the number of work stations N, so that the first gear 21 and the second gear 22 mesh, the third gear 23 meshes with the second gear 22, and the internal gear 24 meshes with the third gear 23. A first motor and a second motor are installed at the transition point A. The first motor is connected to the crank 11 to drive the crank 11 to rotate in the first rotation direction. The second motor is connected to the internal gear 24. The motion curve of the second motor controlling the internal gear 24 is determined according to the preset stop time so that the rotating rod 14 stops for the preset time.

[0027] The first motor drives the crank 11 to rotate, and the crank 11 drives the rotating rod 14 to rotate via the connecting rod 12. Simultaneously, the first gear 21 drives the third gear 23 to rotate via the second gear 22. The motion of the third gear 23 is constrained by the internal gear 24. By controlling the intermittent operation of the second motor, the motion curve of the internal gear 24 controlled by the second motor is determined according to the preset stop time. When the second motor stops, the internal gear 24 is kept in a fixed state, and the power unit is in a single-degree-of-freedom state, with power input only through the first motor driving the crank 11, ensuring the smooth rotation of the third gear 23. When the second motor rotates, it drives the internal gear 24 to rotate, and the power unit becomes a two-degree-of-freedom structure. The rotation of the internal gear 24 can adjust the position of the rotating rod 14, keeping it stationary. Due to the use of the crank-rocker structure 1, this four-bar linkage 12 structure itself has two dead points. When transfer point B is located on the line connecting transfer points A and C or its extension, rocker arm 13 is at its extreme swing angle. At this time, the third gear 23 is in a stopped state, allowing the tobacco label packaging action to begin. The motion curve of the second motor-controlled internal gear 24 is determined based on the preset stop time, and the internal gear 24 is rotated according to the motion curve, enabling the rotating rod 14 to stop for the preset time. Using the above method, and utilizing the mechanical form of a four-bar linkage combined with gear transmission structure 2, high-precision control can be achieved using a common motor, thus meeting the needs of label packaging.

[0028] In some embodiments, the pitch circle radius of the first gear 21 is equal to that of the third gear 23. This design ensures that the first gear 21 and the second gear 22 have the same number of teeth. During the rotation of the third gear 23 via the second gear 22, the second gear 22 acts as a transition gear, and the rotational directions and speeds of the first gear 21 and the second gear 22 are the same. This method facilitates the rapid design of the power unit for the label packaging. In other embodiments, the pitch circle radius of the first gear 21 and the third gear 23 can be designed to be unequal. The rotational speed of the third gear 23 can be determined based on the transmission ratio of the number of teeth between the first gear 21 and the third gear 23, facilitating the subsequent design of the internal gear 24 and the operation of the second motor.

[0029] In some embodiments, the pitch circle radius of the first gear 21 is equal to the length of the crank 11. Since the lengths of the crank-rocker structure 1 are mutually constrained, and the gears are required for transmission, by making the pitch circle radius of the first gear 21 equal to the length of the crank 11, the stable operation of the crank-rocker structure 1 can be ensured, while facilitating the installation and arrangement of the gear transmission structure 2.

[0030] In some embodiments, when the rotating rod 14 deflects along the first rotation direction, the second motor starts to drive the internal gear 24 to rotate, thereby counteracting the deflection of the rotating rod 14 and causing the rotating rod 14 to stop rotating for a preset time. Taking a four-position power unit with the crank 11 rotating at a constant speed and the internal gear 24 in a fixed state as an example: where the first rotation direction is counterclockwise, such as... Figure 4 As shown in (a), the initial position of transition point B is located on the extension line of transition points A and C, transition point D is located at position 0, and the instantaneous speed of the third gear 23 is 0. Figure 4 As shown in (b), when crank 11 rotates counterclockwise at a constant speed of 50°, crank 14 rotates counterclockwise by a certain angle, and the third gear 23 reaches its maximum clockwise rolling speed. Figure 4 As shown in (c), when crank 11 rotates counterclockwise by a constant speed of 100°, crank 14 rotates counterclockwise to its maximum angle, and the instantaneous speed of the third gear 23 is 0. Figure 4 As shown in (d), when crank 11 rotates counterclockwise at a constant speed of about 185°, crank 14 rotates clockwise by a certain angle, and the third gear 23 reaches its maximum counterclockwise rolling speed, as shown in (d). Figure 4 As shown in (e), when crank 11 rotates counterclockwise by a constant speed of 270°, crank 14 rotates clockwise by 90°, reaching the three-point position, and the instantaneous speed of the third gear 23 is 0. Figure 5 The figure shows the motion curves in the above process, where Figure 5The horizontal axis represents the rotation angle of crank 11, and the vertical axis represents the velocity of lever 14, in degrees per second (° / s). Observing the above motion reveals a pattern: when crank 11 rotates 270° counterclockwise, lever 14 rotates 90° clockwise. However, the rotation of lever 14 includes a period of reverse oscillation. Therefore, if this reverse oscillation is made to stop, a four-position power unit can be obtained. For example... Figure 3 As shown, the first motor drives the crank 11 to rotate counterclockwise at a constant speed. The fixed constraint of the internal gear 24 is removed. The second motor is added to control the internal gear 24. Through the meshing transmission between the internal gear 24 and the third gear 23, the counterclockwise swing of the rotating rod 14 is counteracted, so that the rotating rod 14 is kept in a pause for a preset time, which can satisfy the four-position transmission.

[0031] In some embodiments, when the rotating rod 14 rotates in a second rotation direction opposite to the first rotation direction, the second motor is stopped, causing the internal gear 24 to stop rotating. When the rotating rod 14 rotates in the second rotation direction, during the workstation switching process, by stopping the second motor and causing the internal gear 24 to stop rotating, the power unit of the cigarette packing wheel only receives power input at the crank, ensuring the normal movement of the crank-rocker structure 1 and the normal rotation of the rotating rod 14.

[0032] In some embodiments, the total transmission ratio from the first gear 21 to the internal gear 24 is equal to N. Since the first gear 21, the second gear 22, the third gear 23, and the internal gear 24 mesh sequentially, with the second gear 22 and the third gear 23 both acting as transition gears, the above limitations facilitate the design of the gear transmission structure 2.

[0033] In some embodiments, a first reducer is provided at the output shaft of the first motor, and a second reducer is provided at the output shaft of the second motor. By providing reducers, the gear transmission ratio between the input and output shafts can be changed, adjusting the speed of the prime mover (such as a motor or engine) to the speed required by the working equipment. According to the principle of power conservation, the torque is changed simultaneously with the speed adjustment. During deceleration, the output torque increases proportionally with the transmission ratio; during acceleration, the torque decreases accordingly, matching high-speed, light-load working scenarios. By selecting a reducer with a suitable reduction ratio, the actual needs of label paper packaging can be well matched. In particular, the second reducer is crucial because the second motor needs to keep the internal gear 24 in a stopped state. Without a second reducer, the second motor would be stuck, which could easily lead to its burnout after a certain period. Therefore, by providing a second reducer in conjunction with the second motor, the internal gear 24 can be effectively kept in a fixed state, and the second motor can be protected, extending its service life.

[0034] In some embodiments, first bearings are provided at transition points A, B, C, and D, and second bearings are provided at the rotation centers of the first gear 21, second gear 22, third gear 23, and internal gear 24. By providing first and second bearings, the rolling bearing relies on the rolling of rolling elements (steel balls, rollers, etc.) to support rotation. The rolling bearing replaces sliding friction with rolling friction, significantly reducing the coefficient of friction between the shaft and the bearing, reducing energy loss, and improving transmission efficiency. This advantage is particularly pronounced in high-speed operation scenarios, effectively reducing heat generation and power consumption during rotation.

[0035] In some embodiments, when the number of workstations N=4, the ratio of the pitch circle diameter of the first gear 21 to the pitch circle diameter of the internal gear 24 is 1:4. When the crank 11 rotates 270° in the first rotation direction, the rotating rod 14 stops rotating for 100°, resulting in a motion-to-stop ratio of 1.7:1. If the internal gear 24 remains fixed, the rotating rod 14 reaches its maximum deflection position when the crank 11 rotates 100° counterclockwise. Therefore, in this embodiment, the internal gear 24 is controlled to rotate by the second motor, so that when the crank 11 rotates 100° counterclockwise, the rotating rod 14 remains stationary, and during the remaining 170°, the rotating rod 14 rotates synchronously, thus achieving a motion-to-stop ratio of 1.7:1.

[0036] In some embodiments, when the number of stations N=8, the pitch circle diameter of the first gear 21 : the pitch circle diameter of the internal gear 24 = 1 : 8. With the above settings, an eight-station configuration can be achieved.

[0037] In some embodiments, an angle detection element is provided at the output shaft of the second motor, and the angle detection element is electrically connected to the second motor. The angle detection element can be a contact angle sensor, such as a potentiometer-type angle sensor: it measures the angle by utilizing the change in resistance value as the shaft rotates, and outputs a voltage signal proportional to the angle; a conductive plastic potentiometer: using conductive plastic as the resistive substrate, it has stronger wear resistance and higher accuracy than traditional potentiometers; or a rotary encoder (contact type): it outputs an angle signal by having brushes contact the conductive tracks on the encoder disk, and has a simple structure. The angle detection element can also be a non-contact angle sensor, which does not require physical contact and relies on electromagnetic, optical, or other principles to detect the angle, offering high accuracy and long lifespan. For example, a photoelectric rotary encoder: it outputs a pulse signal by photoelectrically detecting the bright and dark scales on the encoder disk, and is divided into incremental and absolute types. Incremental encoders output pulse counts to reflect angle changes and require a counting circuit. Absolute encoders have a unique code for each angular position, allowing direct reading of the absolute angle value. Magnetoelectric angle sensors use Hall effect or magnetoresistive elements to detect changes in the rotating magnetic field to measure angle. Capacitive angle sensors change the relative area or spacing of capacitor plates by rotating the shaft, causing a change in capacitance to detect angle. They offer high accuracy, fast response, and no wear. Alternatively, inductive angle sensors utilize the principle of mutual inductance, changing the coupling degree of the coil by rotating the shaft, causing a change in inductance to measure angle. These are available in variable reluctance and synchronizer types, with synchronizers enabling high-precision angle transmission and detection. By setting an angle detection element, the rotation angle of the second motor can be accurately detected when the internal gear 24 rotates under the power output of the second motor, and the corresponding data is transmitted to the second motor to form a closed-loop control. This effectively compensates for and counteracts the reverse oscillation of the rotating rod 14, keeping it paused for a certain period and ensuring smooth label packaging operations.

[0038] like Figure 6 As shown, the horizontal axis represents the switching cycle of one station of the four-station power unit, in degrees; the horizontal axis represents the angular velocity of the rotating rod, in degrees / s; the triangular marker line is the angular velocity curve of the rotating rod in this embodiment, and the circular marker line is the angular velocity curve of the motor drive directly used in the comparative example. Figure 7 As shown, the horizontal axis represents one cycle of the four-position power unit, in degrees; the horizontal axis represents the angular acceleration of the rotating rod, in degrees / s. 2 In this embodiment, the triangular marker line represents the angular acceleration curve of the rotating rod, while the circular marker line represents the angular acceleration curve of the motor-driven model in the comparative example. The comparison shows that this solution significantly reduces both the maximum angular velocity and the maximum angular acceleration. Therefore, the requirements can be met using a motor with less stringent acceleration and deceleration requirements.

[0039] This application also provides a power device, which includes a crank-rocker structure 1, a gear transmission structure 2, a first motor, and a second motor. The gear transmission structure 2 includes a first gear 21, a second gear 22, a third gear 23, and an internal gear 24 that mesh sequentially. The power device is configured according to the design method of the power device for the cigarette pack packaging wheel described above. Through the above configuration, high-precision control can be achieved using a common motor, thereby meeting the needs of trademark paper packaging.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A design method for the power device of a cigarette packing wheel, characterized in that, The cigarette packing wheel has N workstations, each workstation corresponding to a preset stop time, where N is an integer greater than or equal to 3. The design method includes the following steps: A crank-rocker structure is constructed using four transition points A, B, C, and D (1), where AB rod is the crank (11), BC rod is the connecting rod (12), CD rod is the rocker (13), and AD rod is the rotating rod (14). A first gear (21) is set at the transition point B, and the first gear (21) is fixedly connected to the crank (11). A second gear (22) is set coaxially at the transition point C, a third gear (23) is set rotatably at the transition point D, and an internal gear (24) is set coaxially at the transition point A. The pitch circle diameter of the first gear (21), the pitch circle diameter of the third gear (23), and the pitch circle diameter of the internal gear (24) are determined according to the number of work stations N, so that the first gear (21) and the second gear (22) mesh, the third gear (23) meshes with the second gear (22), and the internal gear (24) meshes with the third gear (23). A first motor and a second motor are provided at the transfer point A. The first motor is connected to the crank (11) to drive the crank (11) to rotate in a first rotation direction. The second motor is connected to the internal gear (24). The motion curve of the second motor controlling the internal gear (24) is determined according to the preset time of the stop, so that the rotating rod (14) stops for the preset time.

2. The design method of the power device for the cigarette packing wheel according to claim 1, characterized in that, When the rotating rod (14) deflects along the first rotation direction, the second motor starts to drive the internal gear (24) to rotate, thereby counteracting the deflection of the rotating rod (14) and causing the rotating rod (14) to stop rotating for the preset time.

3. The design method of the power device for the cigarette packing wheel according to claim 1, characterized in that, When the rotating rod (14) rotates in a second rotation direction opposite to the first rotation direction, the second motor stops, causing the internal gear (24) to stop rotating.

4. The design method of the power device for the cigarette packing wheel according to claim 1, characterized in that, The pitch circle radius of the first gear (21) is equal to that of the third gear (23).

5. The design method of the power device for the cigarette packing wheel according to claim 2, characterized in that, The pitch circle radius of the first gear (21) is equal to the length of the crank (11).

6. The design method of the power device for the cigarette packing wheel according to claim 1, characterized in that, The total transmission ratio from the first gear (21) to the internal gear (24) is equal to N.

7. The design method of the power device for the cigarette packing wheel according to claim 6, characterized in that, When the number of work stations N=4, the pitch circle diameter of the first gear (21) is 1:4 of the pitch circle diameter of the internal gear (24). When the crank (11) rotates 270° along the first rotation direction, the rotating rod (14) stops rotating 100°. The ratio of the rotation to the stop of the rotating rod (14) is 1.7:

1.

8. The design method of the power device for the cigarette packing wheel according to claim 1, characterized in that, When the number of work stations N=8, the pitch circle diameter of the first gear (21) is 1:8 of the pitch circle diameter of the internal gear (24).

9. The design method of the power device for the cigarette packing wheel according to claim 1, characterized in that, An angle detection element is provided at the output shaft of the second motor, and the angle detection element is electrically connected to the second motor.

10. A power unit, characterized in that, The device includes a crank rocker structure (1), a gear transmission structure (2), a first motor and a second motor. The gear transmission structure (2) includes a first gear (21), a second gear (22), a third gear (23) and an internal gear (24) that mesh in sequence. The power unit is designed according to the design method of the power unit of the tobacco packaging wheel as described in any one of claims 1-9.

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