阅读说明：本技术 平衡系统及具有其的两轮车 (Balance system and two-wheeled vehicle with same ) 是由 桑毅 史泽坤 于 2018-07-05 设计创作，主要内容包括：本发明提供了一种平衡系统及具有其的两轮车,其中,平衡系统用于控制力矩陀螺摆动以维持两轮车平衡,平衡系统包括：固定架；力矩陀螺,力矩陀螺可枢转地设置在固定架上；驱动装置,驱动装置与力矩陀螺连接,驱动装置包括：动力输出部,动力输出部设置在固定架上；丝杆,丝杆与动力输出部驱动连接；连接结构,连接结构与力矩陀螺连接,且连接结构与丝杆螺纹连接,以在丝杆的驱动下沿丝杆往复移动而带动力矩陀螺摆动。本发明解决了现有技术中的两轮车的驱动力矩陀螺摆动的机构形式简单而无法为力矩陀螺提供足够的扭矩,从而在力矩陀螺的飞轮转速过高的情况下,无法可靠地保证力矩陀螺摆动,进而导致两轮车失去平衡的问题。(The invention provides a balance system and a two-wheeled vehicle with the same, wherein the balance system is used for controlling a moment gyro to swing so as to maintain the balance of the two-wheeled vehicle, and comprises: a fixed mount; the moment gyro is pivotally arranged on the fixed frame; drive arrangement, drive arrangement and moment top are connected, and drive arrangement includes: the power output part is arranged on the fixed frame; the screw rod is in driving connection with the power output part; and the connecting structure is connected with the moment gyroscope and is in threaded connection with the lead screw so as to reciprocate along the lead screw under the driving of the lead screw and drive the moment gyroscope to swing. The invention solves the problem that the swing mechanism of the driving moment gyro of the two-wheel vehicle in the prior art is simple in form and cannot provide enough torque for the moment gyro, so that the swing of the moment gyro cannot be reliably ensured under the condition that the rotating speed of a flywheel of the moment gyro is overhigh, and the two-wheel vehicle loses balance.)

1. A balance system for controlling a moment gyro (200) to oscillate to maintain two wheel vehicle balance, comprising:

a holder (100);

the moment gyro (200), the said moment gyro (200) is set up on the said fixed mount (100) pivotably;

a driving device (300), wherein the driving device (300) is connected with the moment gyro (200) to drive the moment gyro (200) to rotate, and the driving device (300) comprises:

a power output part (10), wherein the power output part (10) is arranged on the fixing frame (100);

the screw rod (20), the said screw rod (20) is connected with said power take-off (10) drive;

the connecting structure (30) is connected with the moment gyro (200), and the connecting structure (30) is in threaded connection with the screw rod (20) so as to drive the moment gyro (200) to swing along the reciprocating movement of the screw rod (20) under the driving of the screw rod (20).

2. The balancing system according to claim 1, characterized in that the connection structure (30) comprises:

a connecting assembly (31), the connecting assembly (31) having a connecting end (311) connected with the moment gyro (200);

the nut mounting seat (32) is pivotally connected with the connecting assembly (31) through a rotating shaft (400);

the screw nut (33) is arranged on the screw nut mounting seat (32) and is in threaded connection with the screw rod (20).

3. A balancing system according to claim 2, wherein the connecting assembly (31) comprises:

the clamping block (312) is provided with a connecting end (311) clamped with the moment gyro (200), the clamping block (312) is provided with an avoiding notch (314), and the avoiding notch (314) extends from the end surface of one side, opposite to the connecting end (311), of the clamping block (312) to the connecting end (311);

the sliding part (313) is slidably arranged on the clamping block (312), the sliding direction of the sliding part (313) is the same as the extending direction of the avoiding notch (314), and the nut mounting seat (32) is arranged at the avoiding notch (314) and is in pivot connection with the clamping block (312).

4. The balance system of claim 3, wherein the clamping block (312) is provided with a long sliding hole (315), the balance system further comprises an optical axis (500), the optical axis (500) is arranged in the long sliding hole (315), and the sliding part (313) is connected with the optical axis (500) in a sliding manner.

5. The balance system according to claim 4, wherein the two long sliding holes (315) penetrate the clamping block (312) along an axial direction of the rotating shaft (400), the two long sliding holes (315) are oppositely disposed, the two optical axes (500) are disposed in the two long sliding holes (315) in a one-to-one correspondence, the sliding portion (313) is a bearing mount including a base body (3131) and a protrusion (3132) which are connected, the base body (3131) is covered outside the nut mount (32), the protrusion (3132) is two, and the two protrusions (3132) are slidably connected with the two optical axes (500) in a one-to-one correspondence.

6. The balancing system according to claim 5, further comprising a linear bearing (600), wherein the linear bearing (600) is mounted on the optical axis (500) in a sleeved manner, and the linear bearing (600) is connected to the protrusion (3132).

7. The balance system of claim 5, wherein the protrusion (3132) has a fitting hole (3133), one end of the shaft (400) is connected to the nut mounting seat (32), and the other end of the shaft (400) is inserted into the fitting hole (3133).

8. The balancing system according to claim 1, characterized in that the holder (100) comprises:

the driving device (300) is arranged on the mounting frame (101), a supporting plate (700) is arranged on the mounting frame (101), and one end, far away from the power output part (10), of the screw rod (20) is pivotally connected with the supporting plate (700);

the fixed beams (102) are connected with the mounting frame (101) and extend in the horizontal direction, the number of the fixed beams (102) is two, the two fixed beams (102) are arranged at intervals, and the moment gyroscope (200) is pivotally connected with the fixed beams (102) and is positioned between the two fixed beams (102).

9. A balancing system according to claim 1, wherein the power take-off (10) is a drive motor.

10. A two-wheeled vehicle comprising a frame, front and rear wheels arranged on said frame, characterized in that it further comprises a balancing system arranged on said frame, said balancing system being as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of vehicles, in particular to an improvement on a driving mode of a moment gyro of a balance system of a two-wheel vehicle.

Background

Two-wheeled vehicles, as a new type of motor vehicle, are increasingly popular with consumers due to their compact structure, ease of driving, ease of parking, and low energy consumption.

The two-wheeled vehicle is heavy, and in order to facilitate the use of a driver, the two-wheeled vehicle is balanced in a parking state without consuming excessive manpower.

The mechanism for driving the moment gyro to swing of the existing balance system is simple in form, usually, the moment gyro is directly driven to swing by only using a motor or transmits torque to drive the moment gyro to swing in a form that a belt is driven by the motor to rotate, the mechanism cannot output large torque, the larger the flywheel rotating speed of the moment gyro is, the larger the force required by the moment gyro to swing is, and at the moment, the mechanism cannot reliably ensure the moment gyro to normally swing, so that the two-wheel vehicle loses balance, and inconvenience is brought to driving of a driver.

Disclosure of Invention

The invention mainly aims to provide a balance system and a two-wheeled vehicle with the same, and aims to solve the problems that in the prior art, a mechanism for driving a moment gyro of the two-wheeled vehicle to swing is simple in form and cannot provide enough torque for the moment gyro, so that the moment gyro cannot be reliably guaranteed to swing under the condition that the rotating speed of a flywheel of the moment gyro is too high, and the two-wheeled vehicle loses balance.

In order to achieve the above object, according to one aspect of the present invention, there is provided a balance system for controlling a moment gyro to swing to maintain balance of a two-wheeled vehicle, comprising: a fixed mount; the moment gyro is pivotally arranged on the fixed frame; drive arrangement, drive arrangement and moment top are connected to drive moment top and rotate, drive arrangement includes: the power output part is arranged on the fixed frame; the screw rod is in driving connection with the power output part; and the connecting structure is connected with the moment gyroscope and is in threaded connection with the lead screw so as to reciprocate along the lead screw under the driving of the lead screw and drive the moment gyroscope to swing.

Further, the connection structure includes: the connecting component is provided with a connecting end connected with the moment gyro; the nut mounting seat is pivotally connected with the connecting assembly through a rotating shaft; the screw nut is arranged on the screw nut mounting seat and is in threaded connection with the screw rod.

Further, the connection assembly includes: the clamping block is provided with a connecting end clamped with the moment gyroscope and an avoidance notch, and the avoidance notch extends from the end surface of one side, opposite to the connecting end, of the clamping block to the connecting end; the sliding part is slidably arranged on the clamping block, the sliding direction of the sliding part is the same as the extending direction of the avoiding notch, and the nut mounting seat is arranged at the avoiding notch and is pivotally connected with the clamping block.

Further, the clamping block is provided with a sliding long hole, the balance system further comprises an optical axis, the optical axis is arranged in the sliding long hole, and the sliding portion is connected with the optical axis in a sliding mode.

Further, the slot hole that slides link up the grip block along the axis direction of pivot, and the slot hole that slides is two, and two slot holes that slide set up relatively, and the optical axis is two, and two optical axis one-to-ones set up in two slot holes that slide, and the portion of sliding is the bearing mount pad, and the bearing mount pad is including the seat body and the lug that are connected, and the outside at the screw mount pad is established to the seat body cover, and the lug is two, two lugs one-to-ones ground and two optical axis sliding connection.

Further, the balance system further comprises a linear bearing, the linear bearing is sleeved on the optical axis and connected with the bump.

Furthermore, the lug is provided with an assembly hole, one end of the rotating shaft is connected with the nut mounting seat, and the other end of the rotating shaft penetrates through the assembly hole.

Further, the fixing frame includes: the driving device is arranged on the mounting frame, a supporting plate is arranged on the mounting frame, and one end of the screw rod, which is far away from the power output part, is pivotally connected with the supporting plate; fixed beam, fixed beam and installation frame connection and extend along the horizontal direction, and the fixed beam is two, and two fixed beam intervals set up, and moment top and fixed beam pivotal connection are located between two fixed beams.

Further, the power output part is a driving motor.

According to another aspect of the invention, a two-wheeled vehicle is provided, which comprises a frame, a front wheel and a rear wheel arranged on the frame, and a balance system arranged on the frame, wherein the balance system is the balance system.

By applying the technical scheme of the invention, the application provides a balance system, a driving device of the balance system is used for controlling the moment gyro to swing so as to maintain the balance of the two-wheel vehicle, and the driving device adopts a screw rod and a connecting structure in a threaded connection mode to drive the moment gyro to swing, so that the driving device not only can provide a very large swing torque for the moment gyro, ensure that the moment gyro reliably swings and is convenient for accurately controlling the swing angle of the moment gyro, but also has simple structure and low cost, is favorable for reducing the overall cost of the balance system, thereby improving the economy of the two-wheel vehicle and improving the market competitiveness of the two-wheel vehicle.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic structural diagram of a balancing system according to an alternative embodiment of the invention;

FIG. 2 shows a front view schematic of the balancing system of FIG. 1;

FIG. 3 is a schematic diagram illustrating the moment gyro of the balance system of FIG. 1 rotated in a first direction by a certain angle;

FIG. 4 shows a front view schematic of the balancing system of FIG. 3;

fig. 5 is a schematic view showing a moment gyro of the balance system of fig. 1 rotated by a certain angle in a second direction;

FIG. 6 shows a front view schematic of the balancing system of FIG. 5;

fig. 7 shows a partial schematic view of the connection of the moment gyro and the connection structure of the balance system of fig. 1.

Wherein the figures include the following reference numerals:

100. a fixed mount; 101. a mounting frame; 102. a fixed beam; 200. a moment gyro; 300. a drive device; 10. a power output section; 20. a screw rod; 30. a connecting structure; 31. a connecting assembly; 311. a connecting end; 312. a clamping block; 313. a sliding part; 3131. a seat body; 3132. a bump; 3133. an assembly hole; 314. avoiding the notch; 315. a sliding long hole; 32. a nut mounting seat; 33. a nut; 400. a rotating shaft; 500. an optical axis; 600. a linear bearing; 700. and a support plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a balance system and a two-wheeled vehicle, aiming at solving the problems that the swing mechanism of a driving moment gyro of the two-wheeled vehicle in the prior art is simple in form and cannot provide enough torque for the moment gyro, so that the swing of the moment gyro cannot be reliably ensured under the condition that the rotating speed of a flywheel of the moment gyro is too high, and the two-wheeled vehicle loses balance. The two-wheeled vehicle referred to in the present application is preferably a two-wheeled vehicle, but is not limited to this, and includes other motor vehicles or non-motor vehicles having two wheels. The whole bicycle of two wheeler length is littleer, and the wheel base is shorter, and mobility is better, satisfies the requirement of people's short distance trip.

As shown in fig. 1 to 6, the balance system for controlling the moment gyro 200 to swing to maintain the balance of the two-wheeled vehicle includes a fixed frame 100, the moment gyro 200 and a driving device 300, the moment gyro 200 is pivotably disposed on the fixed frame 100, the driving device 300 is connected with the moment gyro 200 to drive the moment gyro 200 to rotate, the driving device 300 includes a power output part 10, a lead screw 20 and a connection structure 30, the power output part 10 is disposed on the fixed frame 100, the lead screw 20 is drivingly connected with the power output part 10, the connection structure 30 is connected with the moment gyro 200, and the connection structure 30 is threadedly connected with the lead screw 20 to reciprocate along the lead screw 20 under the driving of the lead screw 20 to swing the moment gyro 200.

The application provides a balanced system's drive arrangement 300 is used for the swing of control moment top 200 in order to maintain the two wheeler balanced, because drive arrangement 300 adopts lead screw 20 and the swing of connection structure 30 threaded connection's mode drive moment top 200, like this, drive arrangement 300 can only provide the very big swing torque of moment top 200, ensure that moment top 200 swings reliably, be convenient for to the swing angle accurate control of moment top 200, and by power take off portion 10, the simple structure of drive arrangement 300 that lead screw 20 and connection structure 30 constitute, therefore, the carrier wave prepaid electric energy meter is low in cost, be favorable to reducing balanced system's overall cost, thereby promote the economic nature of two wheeler, improve the market competitiveness of two wheeler.

It should be noted that, as shown in fig. 2, fig. 4 and fig. 6, the moment gyro 200 swings back and forth between the positions in the three views, wherein fig. 2 shows the initial position of the moment gyro 200, when the moment gyro 200 rotates for a certain angle around the first direction (counterclockwise direction), the first final position in fig. 4 is reached, then the moment gyro rotates for a certain angle around the second direction (clockwise direction) again and returns to the initial position in fig. 2, then the moment gyro continues to rotate for a certain angle around the second direction (clockwise direction) again and reaches the second final position in fig. 6, and finally the moment gyro reversely rotates for a certain angle around the first direction (counterclockwise direction) and returns to the initial position in fig. 2; to complete one oscillation.

Specifically, as shown in fig. 7, the connection structure 30 includes a connection member 31, a nut mount 32, and a nut 33, the connection member 31 has a connection end 311 connected to the moment gyro 200, the nut mount 32 is pivotally connected to the connection member 31 by a rotation shaft 400, and the nut 33 is disposed on the nut mount 32 and is threadedly connected to the lead screw 20. Thus, the rotation of the screw rod 20 drives the nut 33 to move up and down on the screw rod 20, so that the nut 33 can drive the nut mounting seat 32 to move, and finally, the effect of rotating the connecting assembly 31 to drive the moment gyro 200 to swing through the connecting end 311 is achieved.

As shown in fig. 7, the connecting assembly 31 includes a clamping block 312 and a sliding portion 313, the clamping block 312 has a connecting end 311 clamped with the moment gyro 200, the clamping block 312 has an avoiding notch 314, the avoiding notch 314 extends from an end surface of the clamping block 312 opposite to the connecting end 311, the sliding portion 313 is slidably disposed on the clamping block 312, and a sliding direction of the sliding portion 313 is the same as an extending direction of the avoiding notch 314, wherein the nut mounting seat 32 is disposed at the avoiding notch 314 and pivotally connected with the clamping block 312.

The clamping block 312 is clamped and connected with the moment gyro 200 through the connecting end 311, connection stability between the clamping block and the moment gyro 200 is ensured, so that the moment gyro 200 can follow up with the clamping block 312, the clamping position of the connecting end 311 and the moment gyro 200 can be adjusted, and the vehicle balance can be improved. The nut mounting seat 32 is arranged at the avoiding notch 314, so that the space is fully utilized, the structure miniaturization design of the connecting structure 30 is realized, the connecting structure 30 is convenient to mount, and the overall volume of the vehicle is reduced. The sliding part 313 is slidably disposed on the clamping block 312, and the nut mounting seat 32 is pivotally connected to the clamping block 312, so that the clamping block 312 has a rotational degree of freedom and a moving degree of freedom sliding with respect to the sliding part 313, and the connecting assembly 31 avoids position interference on the swing track of the moment gyro 200, which is more beneficial to the movement of the two.

Specifically, as shown in fig. 7, as an embodiment for stably realizing the sliding motion of the sliding portion 313 on the clamping block 312, the clamping block 312 is provided with a sliding long hole 315, the balance system further includes an optical axis 500, the optical axis 500 is disposed in the sliding long hole 315, and the sliding portion 313 is slidably connected with the optical axis 500.

As shown in fig. 7, in order to ensure stable power transmission to the clamping block 312 through the sliding portion 313 and improve connection stability between the two, the sliding long holes 315 penetrate through the clamping block 312 along the axial direction of the rotating shaft 400, the two sliding long holes 315 are provided, the two sliding long holes 315 are oppositely arranged, the two optical axes 500 are provided in the two sliding long holes 315 in a one-to-one correspondence manner, the sliding portion 313 is a bearing mounting seat which comprises a seat body 3131 and a protruding block 3132 which are connected, the seat body 3131 is covered on the outer side of the nut mounting seat 32, the protruding block 3132 is provided, and the two protruding blocks 3132 are slidably connected with the two optical axes 500 in a one-to-one correspondence manner.

As shown in fig. 7, in order to improve the sliding stability of the bump 3132 on the optical axis 500 and effectively reduce the sliding friction force therebetween, the balancing system further includes a linear bearing 600, the linear bearing 600 is mounted on the optical axis 500 in a sleeved manner, and the linear bearing 600 is connected to the bump 3132.

As shown in fig. 7, the protrusion 3132 has a mounting hole 3133, one end of the rotating shaft 400 is connected to the nut mounting seat 32, and the other end of the rotating shaft 400 passes through the mounting hole 3133. Thus, the nut attachment seat 32 can be rotated stably with respect to the slide portion 313.

As shown in fig. 1 to 6, the fixing frame 100 includes a mounting frame 101 and two fixing beams 102, the driving device 300 is disposed on the mounting frame 101, a supporting plate 700 is disposed on the mounting frame 101, one end of the screw rod 20 away from the power output portion 10 is pivotally connected to the supporting plate 700, the fixing beams 102 are connected to the mounting frame 101 and extend in a horizontal direction, the number of the fixing beams 102 is two, the two fixing beams 102 are disposed at intervals, and the moment gyro 200 is pivotally connected to the fixing beams 102 and is disposed between the two fixing beams 102. In this way, it is effectively ensured that the fixing frame 100 can stably support each structural element, so that the overall structure of the balance system is stable.

Alternatively, the power output 10 is a drive motor.

The specific operation of the balancing system of the present application is described below with reference to the drawings of the specification:

the moment gyro 200 of the balance system shown in fig. 1 and 2 is in an initial position, the moment gyro 200 of the balance system shown in fig. 3 and 4 reaches a first final position after rotating for a certain angle around a first direction (i.e. counterclockwise in the figures), during the movement of the moment gyro 200, the power output part 10 drives the screw rod 20 to rotate, so that the nut mounting seat 32 moves upwards along the screw rod 20, the nut mounting seat 32 pulls the bearing mounting seat and the clamping block 312 to move upwards synchronously, and a rotational degree of freedom exists between the nut mounting seat 32 and the bearing mounting seat, during the process, the convex block 3132 of the bearing mounting seat slides in the sliding long hole 315 along the optical axis 500 in a direction away from the moment gyro 200, and meanwhile, the clamping block 312 clamps one end of the moment gyro 200, so that the moment gyro 200 rotates. It should be further noted that the process of moving the moment gyro 200 from the first final position shown in fig. 3 and 4 to the initial position shown in fig. 1 and 2 is a reverse moving process of the above-mentioned components, and is not described again.

Similarly, the moment gyro 200 of the balance system shown in fig. 1 and 2 is in the initial position, and the moment gyro 200 of the balance system shown in fig. 5 and 6 reaches the second final position after rotating a certain angle around the second direction (i.e. clockwise direction in the figure), during this movement of the moment gyro 200, the power output part 10 drives the screw rod 20 to rotate, so that the nut mounting seat 32 moves downwards along the screw rod 20, the nut mounting seat 32 pulls the bearing mounting seat and the clamping block 312 to move downwards synchronously, and a rotational degree of freedom is provided between the nut mounting seat 32 and the bearing mounting seat, during this process, the boss 3132 of the bearing mounting seat slides in the sliding long hole 315 along the optical axis 500 in the direction close to the moment gyro 200, and at the same time, the clamping block 312 clamps one end of the moment gyro 200, so that the moment gyro 200 rotates. It should be further noted that the process of moving the moment gyro 200 from the second final position shown in fig. 5 and 6 to the initial position shown in fig. 1 and 2 is a reverse moving process of the above-mentioned components, and is not described again.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.