阅读说明：本技术 一种拔销钳 (Pin pulling pliers ) 是由 杨柳辉 商凯 张红南 郑俊亨 钟舒豪 宋亮 姚睿 黄燕夫 黄志雄 沈志毅 胡廷鹤 于 2021-09-28 设计创作，主要内容包括：本发明涉及电力工具技术领域,公开了一种拔销钳,其包括主体、夹持组件、摄像组件和显示组件。夹持组件与主体转动连接,夹持组件用于夹持待拆卸卡销；摄像组件连接于主体上,摄像组件能够对夹持组件的操作过程进行摄像；显示组件与摄像组件电连接。本发明提供的拔销钳,夹持组件能够夹持待拆卸的卡销,以便于作业人员将卡销拔下。摄像组件能够对夹持组件夹持待拆卸卡销的操作过程进行摄像,摄像组件与显示组件电连接,显示组件上能够显示摄像组件拍摄的图像信息,使作业人员能够时刻观测拆拔卡销的过程,进而提高取销作业的效率。(The invention relates to the technical field of electric power tools and discloses pin pulling pliers which comprise a main body, a clamping assembly, a camera assembly and a display assembly. The clamping assembly is rotatably connected with the main body and is used for clamping the clamping pin to be disassembled; the camera shooting assembly is connected to the main body and can shoot an image of the operation process of the clamping assembly; the display assembly is electrically connected with the camera assembly. According to the pin pulling pliers provided by the invention, the clamping assembly can clamp the bayonet pin to be disassembled so as to facilitate an operator to pull the bayonet pin out. The camera shooting assembly can shoot an operation process of clamping the clamping pin to be disassembled, the camera shooting assembly is electrically connected with the display assembly, image information shot by the camera shooting assembly can be displayed on the display assembly, an operator can observe the process of disassembling the clamping pin all the time, and then the efficiency of pin disassembling operation is improved.)

1. Pin pulling pliers, characterized in that it comprises:

a main body (1);

the clamping assembly (2) is rotatably connected with the main body (1), and the clamping assembly (2) is used for clamping a bayonet (100) to be disassembled;

the camera shooting assembly is connected to the main body (1) and can shoot an operation process of the clamping assembly (2);

and the display assembly is electrically connected with the camera assembly.

2. The pin pulling pliers according to claim 1, wherein the clamping assembly (2) comprises a first clamping member (21) and a second clamping member (22), one end of the first clamping member (21) and one end of the second clamping member (22) are respectively hinged with the main body (1), and the first clamping member (21) and the second clamping member (22) can respectively move around the respective hinged points to the directions approaching to or moving away from each other so as to clamp or release the bayonet (100) to be disassembled.

3. The pin pulling pliers according to claim 2, wherein a first clamping groove (211) for clamping with the bayonet lock (100) to be disassembled is formed in the first clamping piece (21), a second clamping groove (221) for clamping with the bayonet lock (100) to be disassembled is formed in the second clamping piece (22), and the first clamping groove (211) and the second clamping groove (221) are spaced and arranged oppositely.

4. The pin pliers according to claim 2, wherein the camera assembly is disposed between the two hinge points.

5. The pin pulling pliers according to claim 1, wherein the main body (1) is provided with a mounting surface, the clamping component (2) is hinged on the mounting surface, a mounting groove is concavely arranged on the mounting surface, and the camera component is arranged in the mounting groove.

6. Pin pulling pliers according to claim 1, characterized in that it further comprises an insulated operating lever group connected to said main body (1), said insulated operating lever group being adjustable in length along its extension.

7. The pin pulling pliers according to claim 6, wherein the insulating operating rod group comprises a plurality of insulating operating rods (31), the insulating operating rods (31) are connected in sequence, and the connecting length of two adjacent insulating operating rods (31) is adjustable.

8. The pin pulling pliers according to claim 7, wherein one end of the insulating operating rod (31) is provided with a plurality of first connecting portions (311), and the other end is provided with a second connecting portion (312), and one of two adjacent insulating operating rods (31) can be selectively connected with the second connecting portion (312) on the other through any one of the first connecting portions (311) thereon.

9. Pin puller according to any of claims 1-8, further comprising an actuating member connected to said body (1), said actuating member being adapted to drive said gripping assembly (2) in rotation to grip said bayonet (100) to be disassembled.

10. The pin pulling pliers according to claim 9, further comprising a first controller and a remote controller, wherein the driving member comprises a second controller, and the first controller is electrically connected to the second controller, the camera assembly, the display assembly and the remote controller, respectively;

the camera shooting assembly sends the acquired image information to the first controller, and the first controller controls the display assembly to display according to the received image information;

the first controller can send a control signal to the second controller according to the received trigger information from the remote controller, so that the second controller controls the driving piece to start, and the output end of the driving piece drives the clamping assembly (2) to rotate so as to clamp the clamping pin (100) to be disassembled.

Technical Field

The invention relates to the technical field of electric power tools, in particular to pin pulling pliers.

Background

The insulator is a special insulating control and can play an important role in an overhead transmission line. The suspension insulator string is in an open environment for a long time, and under the influence of environmental factors such as wind, sunshine and the like, the internal stress of the insulator is unbalanced, so that the low zero value of the insulator and even the structure of the insulator are damaged. The power supply operation and maintenance department needs to overhaul or replace zero-value insulators, lightning-stroke insulators, self-explosion glass insulators and damaged insulators regularly.

The insulator can be replaced by a new insulator only by taking out the spacing bayonet lock between the insulators or between the insulators and the connecting parts of the bulb and the bowl head when the insulators are overhauled or replaced.

At present, the work of taking out the M-shaped bayonet lock of the insulator mainly depends on an operator to operate a common pin pulling clamp arranged on an insulating operating rod, so that a jaw clamps the M-shaped bayonet lock, and then the pin pulling clamp is pulled outwards with force to pull out the M-shaped bayonet lock. However, because the M-shaped bayonet lock is arranged below the porcelain insulator, a sight blind area exists when an operator pulls and pulls the M-shaped bayonet lock, the operator can only operate by feeling by experience, the operation is difficult, and the pin taking work efficiency is low.

Disclosure of Invention

The invention aims to provide the pin pulling pliers, an operator can observe the process of pulling and removing a bayonet lock constantly, the operation is simple, and the pin taking operation efficiency is high.

In order to achieve the purpose, the invention adopts the following technical scheme:

pin pulling pliers, comprising:

a main body;

the clamping assembly is rotatably connected with the main body and is used for clamping a clamping pin to be disassembled;

the camera shooting assembly is connected to the main body and can shoot an operation process of the clamping assembly;

and the display assembly is electrically connected with the camera assembly.

Optionally, the clamping assembly includes a first clamping member and a second clamping member, one end of the first clamping member and one end of the second clamping member are respectively hinged to the main body, and the first clamping member and the second clamping member can respectively move around respective hinge points in directions approaching to or away from each other to clamp or release the bayonet lock to be disassembled.

Optionally, offer on the first holder be used for with wait to dismantle the first joint groove of bayonet lock joint, offer on the second holder be used for with wait to dismantle the second joint groove of bayonet lock joint, first joint groove with second joint groove interval and relative setting.

Optionally, the camera assembly is disposed between the two hinge points.

Optionally, an installation surface is arranged on the main body, the clamping assembly is hinged to the installation surface, an installation groove is concavely arranged on the installation surface, and the camera shooting assembly is arranged in the installation groove.

Optionally, the device further comprises an insulating operating rod group, the insulating operating rod group is connected with the main body, and the length of the insulating operating rod group along the extending direction of the insulating operating rod group is adjustable.

Optionally, the insulating operating rod group includes a plurality of insulating operating rods, the insulating operating rods are connected in sequence, and the connection length between two adjacent insulating operating rods is adjustable.

Optionally, one end of each of the insulating operation rods is provided with a plurality of first connection portions, and the other end of each of the insulating operation rods is provided with a second connection portion, and one of the two adjacent insulating operation rods is selectively connected with the second connection portion on the other insulating operation rod through any one of the first connection portions.

Optionally, the clamping device further comprises a driving member connected to the main body, and the driving member is used for driving the clamping assembly to rotate so as to clamp the clamping pin to be disassembled.

Optionally, the driving part comprises a second controller, and the first controller is electrically connected with the second controller, the camera assembly, the display assembly and the remote controller respectively;

the camera shooting assembly sends the acquired image information to the first controller, and the first controller controls the display assembly to display according to the received image information;

the first controller can send the control signal to the second controller according to the received trigger information from the remote controller, so that the second controller controls the driving piece to start, and the output end of the driving piece drives the clamping assembly to rotate so as to clamp the clamping pin to be disassembled.

The invention has the beneficial effects that:

according to the pin pulling pliers provided by the invention, the clamping assembly can clamp the clamping pin to be disassembled so as to facilitate an operator to take down the clamping pin. The camera shooting assembly can shoot the operation process of the clamping assembly, the camera shooting assembly is electrically connected with the display assembly, image information shot by the camera shooting assembly can be displayed on the display assembly, so that an operator can observe the process of disassembling and pulling the bayonet lock constantly, and the efficiency of pin taking operation is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic view of a part of a pin pulling pliers according to an embodiment of the present invention;

FIG. 2 is a working diagram of a clamping assembly clamping M-shaped clamping pins provided in the first embodiment of the invention;

fig. 3 is a schematic structural diagram of an insulating operating rod according to an embodiment of the present invention.

In the figure:

100. the bayonet lock is to be disassembled;

1. a main body;

2. a clamping assembly; 21. a first clamping member; 211. a first clamping groove; 22. a second clamping member; 221. a second clamping groove;

31. an insulating operating rod; 311. a first connection portion; 312. a second connecting portion;

4. a drive switch;

5. a power switch; 51. an indicator light;

6. a power supply module;

7. a signal transmission member.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

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, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Example one

In the distribution line, a limiting bayonet lock is arranged between the insulators or between the insulators and the connection parts of the ball head and the bowl head, and the limiting bayonet lock is mostly M-shaped. When the insulator is replaced or repaired, an operator can continue to operate after clamping the M-shaped bayonet lock by the pin pulling clamp and pulling out the M-shaped bayonet lock. As shown in fig. 1, the present embodiment provides a pin pulling pliers, which comprises a main body 1, a clamping assembly 2, a camera assembly and a display assembly.

Wherein, the clamping assembly 2 is rotatably connected with the main body 1, and the clamping assembly 2 is used for clamping the bayonet 100 to be disassembled. When clamping assembly 2 grips and waits to dismantle bayonet 100 after, the operating personnel only need pull main part 1 hard, can pull out bayonet 100 from the installation position waiting to dismantle, easy operation saves time. The camera shooting component is connected to the main body 1 and can shoot an image of the operation process of the clamping component 2. The display module is electrically connected with the camera module, and the display module can display image information shot by the camera module. Through the image information that display element shows, the operation personnel can observe the process of tearing open and pulling out the bayonet lock constantly, has further improved the efficiency of getting the round pin operation.

Alternatively, as shown in fig. 1 and 2, the clamping assembly 2 comprises a first clamping member 21 and a second clamping member 22. One end of first clamping member 21 and one end of second clamping member 22 are respectively hinged with main body 1, and first clamping member 21 and second clamping member 22 can respectively move around the respective hinge points to the directions approaching to or moving away from each other so as to clamp or release bayonet 100 to be disassembled. Illustratively, the first and second clamping members 21 and 22 are each a unitary structure. One end of the first clamping piece 21 and one end of the second clamping piece 22 are hinged to the main body 1 respectively, the other end of the first clamping piece 21 and the other end of the second clamping piece 22 can be abutted to each other, and the first clamping piece 21 and the second clamping piece 22 can move towards each other around the respective hinged ends respectively to clamp the bayonet 100 to be disassembled. It is conceivable that the clamping assembly 2 may be damaged during use, and the integrated structure not only facilitates processing and manufacturing, but also facilitates replacement of the first clamping member 21 or the second clamping member 22 by operators when one of the clamping members is damaged, thereby being beneficial to saving use cost.

Alternatively, in this embodiment, the first clamping member 21 is provided with a first connecting hole, a first hinge shaft passes through the first connecting hole and is in clearance fit with the first connecting hole, and the first clamping member 21 is connected with the main body 1 through the first hinge shaft. The second clamping member 22 is provided with a second connecting hole, a second hinge shaft passes through the second connecting hole and is in clearance fit with the second connecting hole, and the second clamping member 22 is connected with the main body 1 through the second hinge shaft. First and second clamping members 21 and 22 are movable in directions toward and away from each other about first and second hinge axes, respectively, to clamp or release bayonet 100 to be disassembled. Illustratively, the first hinge shaft and the second hinge shaft may be selected as bolts having a diameter smaller than the first connection hole and the second connection hole, the bolts passing through the first connection hole and being connected with the main body 1 by nuts, and the bolts passing through the second connection hole and being connected with the main body 1 by nuts. The bolt connection structure is simple, the connection is reliable, the assembly and disassembly are convenient, and the working efficiency of operators is improved.

Optionally, as shown in fig. 1, a first clamping groove 211 for clamping with the bayonet 100 to be disassembled is formed in the first clamping member 21, a second clamping groove 221 for clamping with the bayonet 100 to be disassembled is formed in the second clamping member 22, and the first clamping groove 211 and the second clamping groove 221 are spaced and arranged oppositely. That is to say, the centre gripping subassembly 2 can be through first joint groove 211 and second joint groove 221 with wait to dismantle bayonet lock 100 joint, and then increase centre gripping subassembly 2 and wait to dismantle the area of contact of bayonet lock 100, make centre gripping subassembly 2 with wait to dismantle that bayonet lock 100 laminates inseparabler to further improve the pulling pin success rate of this pulling pin pincers.

Optionally, the camera assembly is connected between the two hinge points. In this embodiment, first holder 21 and second holder 22 interval articulate in the both sides of main part 1, and the subassembly of making a video recording is connected between two pin joints to the overall process that treats to dismantle bayonet lock 100 to the centre gripping of holding component 2 carries out clear making a video recording, so that the operation personnel can observe the process of tearing open the bayonet lock constantly, further improves the efficiency of getting the round pin operation.

Optionally, a mounting surface is arranged on the main body 1, and the clamping assembly 2 is hinged to the mounting surface. The installation face is provided with a mounting groove in a concave mode, and the camera shooting assembly is arranged in the mounting groove. Specifically, the camera with the subassembly of making a video recording sets up in the mounting groove, neither influences the shooting of the subassembly of making a video recording, can also prevent to pull out the in-process of pin pincers at the removal, collides with the camera, has effectively provided the protection to the camera, has prolonged the life of the subassembly of making a video recording.

Optionally, as shown in fig. 3, the pin pliers further comprise an insulated operating rod set. The insulated operating rod group is connected with the main body 1, and the length of the insulated operating rod group along the extending direction of the insulated operating rod group is adjustable. Insulating bar group links to each other with main part 1, and the operation personnel can be through the removal of control insulating bar group, and then drive main part 1 and centre gripping subassembly 2 and remove to extract and wait to dismantle bayonet lock 100. The length of the insulating operation rod group along the extending direction is adjustable, so that the insulating operation rod group can be conveniently operated by an operator in a long distance, and the safety of the operator in operation is effectively improved.

Alternatively, as shown in fig. 3, the insulated operating rod group includes a plurality of insulated operating rods 31, the plurality of insulated operating rods 31 are connected in sequence, and the connection length of two adjacent insulated operating rods 31 is adjustable. That is, the operator can adjust the length of the insulating operating rod group according to the bayonet 100 to be disassembled with different installation heights, so as to improve the use flexibility of the pin pulling pliers, and further improve the pin pulling efficiency of the operator.

Alternatively, one end of the insulating operating rod 31 is provided with a plurality of first connecting portions 311, and the other end is provided with a second connecting portion 312. One of the two adjacent insulated operating rods 31 can be selectively connected with the second connecting part 312 on the other through any one of the first connecting parts 311 thereon. Specifically, in the present embodiment, an external thread is disposed on an outer wall of one end of each of the insulating operation rods 31, an internal thread is recessed in the other end of each of the insulating operation rods 31, and two adjacent insulating operation rods 31 can be threadedly connected to the internal thread of the other insulating operation rod through the external thread of one insulating operation rod. The threaded connection structure is simple, the connection is reliable, the disassembly and the assembly are convenient, and the improvement of the operation efficiency of operators is facilitated. Accordingly, the main body 1 is provided with a threaded connection portion capable of being engaged with an external thread or an internal thread on the insulating operating rod 31.

Optionally, the insulated operating rod set is detachably connected with the main body 1. In this embodiment, the insulating operation rod group is connected with the main body 1 by screw threads, so that the connection is firm and is not easy to loosen. Of course, in other embodiments, the insulating operation rod group and the main body 1 can also be connected in a clamping manner, and the dismounting is convenient.

Optionally, the pin pliers further comprise a drive. The driving member is connected to the main body 1, and the driving member is used for driving the clamping assembly 2 to rotate so as to clamp the clamping pin 100 to be disassembled. Through the action of driving piece drive clamping assembly 2, the consumption of using manpower sparingly is favorable to reducing operation personnel's intensity of labour. The driving part can be a motor exemplarily, has high output power and high speed, is convenient to control, and is beneficial to improving the working efficiency of operators.

Optionally, as shown in fig. 1 and 2, the main body 1 is further provided with a driving switch 4. The driving switch 4 is used for controlling the opening and closing of the driving piece. When the driving switch 4 is in the first position, the driving member is turned on, and drives the clamping assembly 2 to rotate to clamp the clamping pin 100 to be disassembled. When the actuating member is in the second position, the actuating member is closed and the clamping assembly 2 is inactive. Illustratively, the driving switch 4 may be a knob for easy operation by the operator.

Optionally, the pin pliers further comprise a first controller and a remote control, and the drive member comprises a second controller. The first controller is respectively and electrically connected with the camera shooting assembly, the display assembly, the second controller and the remote controller. The camera shooting assembly sends the acquired image information to the first controller, and the first controller controls the display assembly to display according to the received image information. The display component displays the shooting content of the camera component (namely the process of clamping the bayonet 100 to be disassembled by the clamping component 2), so that an operator can observe the operation of the pin pulling pliers all the time. Exemplarily, in the present embodiment, the display component is a handheld mobile terminal such as a mobile phone or a tablet computer, which is convenient for an operator to carry and view. The first controller can also send a control signal to the second controller according to the received trigger information from the remote controller, so that the second controller controls the driving piece to be started, the output end of the driving piece drives the clamping component 2 to rotate to clamp the clamping pin 100 to be disassembled, the accuracy of the action of clamping the clamping component 2 is further ensured, and the success rate of the pin pulling clamp for pin pulling operation is further improved.

Optionally, as shown in fig. 1 and 2, the pin pliers further comprise a signal transmission member 7. The signal transmission piece 7 is electrically connected with the first controller, and the signal transmission piece 7 can remotely receive an operation instruction of the remote controller and transmit the operation instruction to the first controller. In this embodiment, the signal transmission member 7 is an antenna connected to the main body 1, and the antenna is used for receiving a signal sent by the remote controller and transmitting the signal to the first controller. The first controller receives a signal transmitted by the antenna from the remote controller, converts the signal into control information, and then sends the control information to the second controller, and the second controller controls the output end of the driving part to act, so as to control the clamping component 2 to clamp the clamping pin 100 to be disassembled. In other embodiments, the signal transmission unit 7 may also be a wireless device such as a bluetooth device, which can achieve communication connection between the first controller and the remote controller.

Optionally, as shown in fig. 1 and 2, the pin pliers further comprise a power supply module 6. Specifically, in the present embodiment, the power supply module 6 is mounted on the main body 1. The power supply module 6 includes a battery pack that can supply electric power to the driving member and the controllers. The power supply module 6 further comprises a charging interface through which the storage battery pack can be charged.

Optionally, as shown in fig. 1 and 2, the pin pliers further comprise a power switch 5 and an indicator light 51. The power switch 5 is used for controlling the electric connection of the power supply module 6 with the driving part and the controllers. The indicator lamp 51 is used for indicating the power supply state of the power supply module 6, so that an operator can adjust the working state of the pin pulling pliers according to actual conditions. Specifically, the indicator lamp 51 is turned on green, which indicates that the controllers and the driving member are powered on and can operate; the indicator lamp 51 is not on, which indicates that the controllers and the driving part are not powered on; the indicator light 51 is illuminated red to indicate that the respective controller and driver are powered but that the device may be malfunctioning or improperly installed. Of course, in other embodiments, the indicator lamp 51 may display other colors or no indicator lamp 51 is provided, which may be selected according to actual situations.

Example two

The present embodiment provides a pin pulling pliers, and the difference between the present embodiment and the first embodiment is that in the present embodiment, the insulated operating rod set includes a plurality of hollow insulated operating rods 31, and the plurality of insulated operating rods 31 are movably sleeved with each other. One of the two adjacent insulating operation rods 31 is provided with at least two first clamping portions at intervals along the axial direction thereof, and the other one is provided with a second clamping portion capable of being clamped with the first clamping portions. When extending the insulating operation rod group, constructor stimulates two insulating operation rods 31, and the second clamping part is clamped with the first clamping parts at different positions, so as to adjust the length of the insulating operation rod group. When the insulating operation rod group is withdrawn, the constructor can separate the first clamping part and the second clamping part of the two adjacent insulating operation rods 31 only by pushing with force. Correspondingly, the main body 1 is provided with a clamping connection portion which can be matched with the first clamping portion or the second clamping portion on the insulating operation rod 31. Illustratively, one of the first clamping portion and the second clamping portion is a protrusion arranged at an interval along the axial direction of the insulating operating rod 31, and the other is a clamping groove capable of being matched with the protrusion. The clamping connection mode is used, the structure is simple, and the operation is convenient and effortless.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.