阅读说明：本技术 一种电动遥控方钻杆拉送装置及其使用方法 (Electric remote control kelly bar pulling and conveying device and using method thereof ) 是由 张国安 袁小云 朱亚峰 李缨 张军 王松林 巨国庆 谭新红 徐小亮 张正明 王小 于 2019-11-05 设计创作，主要内容包括：本发明提供了一种电动遥控方钻杆拉送装置及其使用方法,该装包括遥控电机、支撑杆、变向滑轮组、钢丝绳和墩座,所述变向滑轮组至少包括第一滑轮、第二滑轮和第三滑轮,所述支撑杆的一端与墩座顶部靠近大鼠洞的一端活动铰接,支撑杆的另一端固定有第一滑轮,墩座顶部远离大鼠洞的一端具有局部向外延伸段,第二滑轮固定于该延伸段上,第三滑轮固定于钻台面上；钢丝绳的一端连接在遥控电机上,另一端经变向滑轮组缠绕后连接在方钻杆上。本发明通过钢丝绳和一组变向滑轮及支撑杆配合,形成一套变向机构,将拉动方钻杆所需的水平拉力由电机传递到方钻杆上,井口只需1个人遥控操作,即可安全平稳地控制方钻杆出入大鼠洞,中途无需人力干预。(The invention provides an electric remote control kelly bar pulling and feeding device and a using method thereof, the device comprises a remote control motor, a support rod, a diversion pulley block, a steel wire rope and a pier seat, wherein the diversion pulley block at least comprises a first pulley, a second pulley and a third pulley; one end of the steel wire rope is connected to the remote control motor, and the other end of the steel wire rope is wound by the turning pulley block and then connected to the kelly bar. According to the invention, a set of steering mechanism is formed by matching the steel wire rope with a set of steering pulleys and the supporting rod, the horizontal pulling force required by pulling the kelly bar is transmitted to the kelly bar by the motor, the wellhead can be safely and stably controlled to enter and exit the rat hole only by 1 person for remote control operation, and no manual intervention is needed in the midway.)

1. The utility model provides an electronic remote control kelly draws and send device which characterized in that: the device at least comprises a remote control motor (1), a support rod (3), a turning pulley block (4), a steel wire rope (5) and a pier seat (6), wherein the pier seat (6) is arranged on a drilling platform surface, the turning pulley block (4) at least comprises a first pulley (4.1), a second pulley (4.2) and a third pulley (4.3), one end of the support rod (3) is rotatably connected with one end, close to a rat hole, of the top of the pier seat (6), the other end of the support rod (3) is fixedly connected with the first pulley (4.1), one end, far away from the rat hole, of the top of the pier seat (6) is provided with a local outward extending section, the second pulley (4.2) is fixed on the local outward extending section of the top of the pier seat (6), and the third pulley (4.3) is fixed on the drilling platform surface; one end of the steel wire rope (5) is connected to the remote control motor (1), and the other end of the steel wire rope (5) is connected to the kelly bar after sequentially passing through the third pulley (4.3), the second pulley (4.2) and the first pulley (4.1).

2. An electrically operated remote kelly bar pulling apparatus as defined in claim 1, wherein: the device also comprises a remote controller (2), wherein the remote controller (2) controls the remote control motor (1) to rotate forwards or backwards.

3. An electrically operated remote kelly bar pulling apparatus as defined in claim 1, wherein: the remote control motor (1) is arranged at one corner of the farthest end on the surface of the drill table.

4. An electrically operated remote kelly bar pulling apparatus as defined in claim 3, wherein: the turning pulley block (4) further comprises a fourth pulley (4.4) vertically fixed on the drilling platform surface, the steel wire rope (5) forms a 90-degree included angle on the drilling platform surface after being connected by the remote control motor (1), the fourth pulley and the third pulley (4.3) in sequence, and the third pulley (4.3) and the second pulley (4.2) are located on the same vertical line.

5. An electrically operated remote kelly bar pulling apparatus as defined in claim 4, wherein: a first steel wire rope sleeve is sleeved on the steel wire rope (5) between the remote control motor (1) and the fourth pulley (4.4), and a second steel wire rope sleeve is sleeved on the steel wire rope (5) between the fourth pulley (4.4) and the third pulley (4.3).

6. An electrically operated remote kelly bar pulling apparatus as defined in claim 1, wherein: the supporting rod (3) is movably hinged to the outer side of the top of the pier seat (6) through a first pin shaft and rotates around the hinged end of the supporting rod and the pier seat (6); one end of the support rod (3) close to the pier seat (6) is provided with a threaded hole, a bolt is arranged in the through hole, a nut aligned with the through hole is welded on the pier seat (6), and the bolt is matched and fastened with the nut to lock the support rod (3) at the outer side of the pier seat (6) in a horizontal state; when the supporting rod (3) needs to be overturned and recovered to the pier seat (6), the bolt only needs to be loosened and drawn out.

7. An electrically operated remote kelly bar pulling apparatus as defined in claim 1, wherein: the remote control motor (1) is a speed-adjustable motor with the speed of 0-20 m/min.

8. A method of using an electrically operated remotely controlled kelly pull according to any one of claims 1 to 8, comprising the steps of:

s001: one end of a steel wire rope (5) is connected to the remote control motor (1), and the other end of the steel wire rope (5) is fixed on the kelly bar after passing through the turning pulley block (4);

s002: when the device is used, the support rod (3) is made to be in a horizontal state, then the remote control switch (2) is turned on, the remote control motor (1) is controlled to rotate forwards, the steel wire rope (5) is tightened, and at the moment, the steel wire rope (5) pulls the kelly bar to the position above the rat hole from the wellhead under the action of the turning pulley block (4);

s003: when the kelly is aligned with the rat hole opening, an operator closes the remote control switch (2), the remote control motor (1) stops rotating, and the driller lowers the kelly and enters the rat hole;

s004: when the kelly bar goes out of the rat hole, the remote control motor (1) is controlled to rotate reversely through the remote control switch (2), the steel wire rope (5) is loosened when the remote control motor (1) rotates reversely, and the kelly bar is pulled out of the rat hole along with the steel wire rope (5) and moves to a well head;

s005: the supporting rod (3) is folded and retracted.

Technical Field

The invention belongs to the technical field of drilling engineering machinery, and particularly relates to an electric remote control kelly bar pulling and conveying device and a using method thereof.

Background

In the process of oil field drilling operation, various working condition conversion such as tripping and drilling needs to be frequently carried out, particularly, when the working condition conversion is carried out between drilling and tripping, a kelly needs to be pulled into a rat hole, the mode that the kelly enters and exits the rat hole is manual operation at present, a drill rod hook is used for pulling the kelly into the rat hole, the lower end of the kelly is suspended because the rat hole has a certain distance with a turntable, the top end of the kelly is connected with a traveling block, the kelly inclines in the process of manually pulling the kelly to form a pulling force opposite to the manual pulling direction towards the center of a drill floor, usually 3-4 people can pull the kelly into the rat hole by exerting effort, and when the number of people is small, people can be pulled back to the turntable of the drill floor by the reverse pulling force of the kelly, and even can hurt people due to the swinging of the suspended kel.

In recent years, a drilling kelly rat hole entering device (application number is CN 201620523180.6) using a pneumatic winch as a power source is formed by connecting a kelly, a rat hole, a rope, a rat hole fixed pulley, a pneumatic winch pulley and a pneumatic winch, wherein one end of the rope is connected to the pneumatic winch, the other end of the rope is connected to the kelly, and the middle of the rope passes through the rat hole fixed pulley and the pneumatic winch pulley; the rat hole is fixed on the drilling platform surface.

Although the device solves the problems of heavy physical power and high risk operation of manually pushing the kelly bar to go in and out of the rat hole, the problems of difficult installation and disassembly, occupation of the area of a drill floor and influence on the escape passage of an inner bench worker in some emergency situations.

Disclosure of Invention

The embodiment of the invention aims to provide an electric remote control kelly bar pulling and feeding device and a using method thereof, so as to overcome the technical defects.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

an electric remote control kelly bar pulling and conveying device at least comprises a remote control motor, a supporting rod, a turning pulley block, a steel wire rope and a pier seat, wherein the pier seat is arranged on a drilling platform surface, the turning pulley block at least comprises a first pulley, a second pulley and a third pulley, one end of the supporting rod is rotatably connected with one end, close to a rat hole, of the top of the pier seat, the end part of the other end of the supporting rod is fixedly connected with the first pulley, one end, far away from the rat hole, of the top of the pier seat is provided with a local outward extension section, the second pulley) is fixed on the local outward extension section of the top of the pier seat, and the third pulley is fixed on the drilling platform surface; one end of the steel wire rope is connected to the remote control motor, and the other end of the steel wire rope is connected to the kelly bar after passing through the third pulley, the second pulley and the first pulley in sequence.

Furthermore, the device also comprises a remote controller which controls the remote control motor to rotate forwards or backwards.

Preferably, the remote motor is mounted on the drill floor at the most distal corner.

Further, the turning pulley block further comprises a fourth pulley vertically fixed on the drilling platform surface, the steel wire rope forms a 90-degree included angle on the drilling platform surface after being connected with the remote control motor, the fourth pulley and the third pulley in sequence, and the third pulley and the second pulley) are located on the same vertical line.

Preferably, a first steel wire rope sleeve is sleeved on the steel wire rope between the remote control motor and the fourth pulley, and a second steel wire rope sleeve is sleeved on the steel wire rope between the fourth pulley and the third pulley.

Preferably, the support rod is movably hinged to the outer side of the top of the pier seat through a first pin shaft and rotates around the hinged end of the support rod and the pier seat; one end of the support rod, which is close to the pier seat, is provided with a threaded hole, a bolt is arranged in the through hole, a nut aligned with the through hole is welded on the pier seat, and the bolt is matched and fastened with the nut to lock the support rod on the outer side of the pier seat in a horizontal state; when the supporting rod needs to be turned over and recovered to the pier seat, the bolt only needs to be loosened and drawn out.

The supporting rod is movably hinged to the outer side of the top of the pier seat through a second pin shaft and rotates around the hinged end of the supporting rod and the pier seat; a groove is formed in a preset position of the side wall of the pier seat, a pull rod for controlling the turning degree is arranged between the support rod and the pier seat, and the pull rod can slide along the groove; when the pull rod slides upwards to the top end of the groove, the support rod is turned downwards by 90 degrees through the pin shaft and is in a folding and bending state; when the pull rod slides downwards to the bottom end of the groove, the supporting rod is turned upwards through the pin shaft and is completely unfolded to a horizontal position under the action of upward pulling force of an operator, and the supporting rod and the pier seat are locked by the pull rod at the moment.

Preferably, the remote control motor is a speed-adjustable motor with the speed of 0-20 m/min.

A method for pulling a kelly bar to enter and exit a rat hole by adopting an electric remote control kelly bar pulling device comprises the following steps:

s001, connecting one end of a steel wire rope to a remote control motor, and winding the other end of the steel wire rope on a kelly bar through a turning pulley block;

s002, an operator turns on the remote control switch, the remote control motor rotates, and the steel wire rope pulls the kelly bar to the position above the rat hole from the wellhead position under the action of the turning pulley block;

s003, when the kelly is aligned with the rat hole opening, an operator closes the remote control switch, the remote control motor stops rotating, and the driller lowers the kelly and enters the rat hole;

and S004, when the kelly bar goes out of the rat hole, in order to avoid swinging to impact a well head or personnel, the same method is used for reverse operation, and the kelly bar is controlled to move to the well head.

The invention has the following beneficial effects:

1. the invention takes a remote control positive and negative rotation motor as a power source, a set of direction changing mechanisms are formed by matching a steel wire rope with a group of direction changing pulleys and a support rod, and the horizontal pulling force required by pulling a kelly bar is transmitted to the kelly bar by the motor, so that the kelly bar can be safely and stably controlled to go in and out of a rat hole.

2. When in use, the supporting rod can horizontally extend out and be fixed; after the use is finished, the foldable drill floor can be folded and recovered, so that the space of the drill floor is not occupied.

3. The remote control motor is arranged at one corner of the farthest end of the drill floor, so that the passing of the drill floor surface is not influenced.

4. The direction-changing pulley block is properly and vertically or horizontally arranged, so that the required direction-changing requirement of the steel wire rope is met.

5. The power assisting device for replacing manpower to push and pull the kelly bar to enter and exit the rat hole is designed, has a simple structure and accurate positioning, can greatly reduce the labor intensity of drilling workers when the kelly bar is pushed and pulled to enter and exit the rat hole, and has the advantages of safety, convenience, labor saving, high efficiency and the like.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the structure of an electrically remote-controlled kelly bar pulling and feeding device;

FIG. 2 is a top view of the electrically remote kelly pull device;

fig. 3 is a folding schematic view of the support rod.

Description of reference numerals:

1. a remote control motor; 2. a remote controller; 3. a support bar; 4. a direction-changing pulley block; 5. a wire rope; 6. pier seats; 3.1, a second pin shaft; 3.2, a pull rod; 4.1, a first pulley; 4.2, a second pulley; 4.3, a third pulley; 4.4, a fourth pulley; 6.1, grooves.

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. 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.

First embodiment

The first embodiment of the invention relates to an electric remote control kelly bar pulling and feeding device, as shown in fig. 1 and fig. 2, the device at least comprises a remote control motor 1, a support rod 3, a diversion pulley block 4, a steel wire rope 5 and a pier seat 6, wherein the pier seat 6 is arranged on a drilling platform surface, the diversion pulley block 4 at least comprises a first pulley 4.1, a second pulley 4.2 and a third pulley 4.3, one end of the support rod 3 is rotatably connected with one end of the top of the pier seat 6 close to a rat hole, the other end of the support rod 3 is fixedly connected with the first pulley 4.1, one end of the top of the pier seat 6 far away from the rat hole is provided with a local outward extension section, the second pulley 4.2 is fixed on the local outward extension section of the top of the pier seat 6, and the third pulley 4.3 is fixed on the drilling platform surface; one end of the steel wire rope 5 is connected to the remote control motor 1, and the other end of the steel wire rope 5 is connected to the kelly bar after sequentially passing through the third pulley 4.3, the second pulley 4.2 and the first pulley 4.1.

The embodiment also provides a method for pulling the kelly bar to enter and exit the rat hole by adopting the electric remote control kelly bar pulling and feeding device, which comprises the following steps:

s001, connecting one end of a steel wire rope 5 to the remote control motor 1, and fixing the other end of the steel wire rope 5 on the kelly bar after passing through the turning pulley block 4;

s002, when the device is used, the supporting rod 3 is made to be in a horizontal state, then the remote control switch 2 is turned on, the remote control motor 1 is controlled to rotate forwards, the steel wire rope 5 is tightened, and at the moment, the steel wire rope 5 pulls the kelly bar to the position above the rat hole from the wellhead through the action of the turning pulley block 4;

s003, when the kelly is aligned with the rat hole, the operator closes the remote control switch 2, the remote control motor 1 stops rotating, and the driller lowers the kelly and enters the rat hole;

s004, when the kelly bar goes out of the rat hole and the kelly bar goes out of the rat hole, the remote control motor 1 is controlled to rotate reversely through the remote control switch 2, the steel wire rope 5 is loosened when the remote control motor 1 rotates reversely, and the kelly bar is pulled out of the rat hole along with the steel wire rope 5 and moves to a well head;

s005, the supporting rod 3 is folded and retracted.

According to the invention, a set of steering mechanism is formed by matching the steel wire rope with a set of steering pulleys and the supporting rod, the horizontal pulling force required by pulling the kelly bar is transmitted to the kelly bar by the motor, the wellhead can be safely and stably controlled to enter and exit the rat hole only by 1 person for remote control operation, and no manual intervention is needed in the midway.

Second embodiment

The embodiment relates to an electric remote control kelly bar pulling and feeding device, which at least comprises a remote control motor 1, a remote controller 2, a support rod 3, a diversion pulley block 4, a steel wire rope 5 and a pier seat 6 as shown in figure 1, wherein the diversion pulley block 4 comprises a first pulley 4.1, a second pulley 4.2, a third pulley 4.3 and a fourth pulley 4.4, the pier seat 6 is arranged on a drilling platform surface, one end of the support rod 3 is rotatably connected with one end of the top of the pier seat 6 close to a rat hole, the end part of the other end of the support rod 3 is fixedly provided with the first pulley 4.1 which is arranged in a horizontal state, and the first pulley 4.1 and the support rod 3 are positioned on the same horizontal line; one end of the top of the pier seat 6, which is far away from the rat hole, is provided with a local outward extending section, the second pulley 4.2 is vertically fixed on the local outward extending section of the top of the pier seat 6, the third pulley 4.3 is vertically fixed on the drilling platform surface, and the third pulley 4.3 and the second pulley 4.2 are positioned on the same vertical line; one end of the steel wire rope 5 is connected to the remote control motor 1, and the other end of the steel wire rope 5 is connected to the kelly bar after sequentially passing through the fourth pulley 4.4, the third pulley 4.3, the second pulley 4.2 and the first pulley 4.1.

In this embodiment, it is worth mentioning that the steel wire rope 5 forms a first included angle of 90 degrees on the drilling platform surface after being sequentially connected by the remote control motor 1, the fourth pulley and the third pulley 4.3; the direction-changing pulley block is correspondingly vertically or horizontally arranged, so that the required direction-changing requirement of the steel wire rope is met.

Further, the steel wire rope 5 between the remote control motor 1 and the fourth pulley 4.4 is sleeved with a first steel wire rope sleeve, the steel wire rope 5 between the fourth pulley 4.4 and the third pulley 4.3 is sleeved with a second steel wire rope sleeve, the remote control motor 1 is installed at one corner of the farthest end of the drill floor, and the steel wire rope laid on the surface of the drill floor is sleeved with the steel wire rope sleeve, so that the passing of the drill floor cannot be influenced.

Third embodiment

On the basis of the above embodiment, as a preferable option, the support rod 3 is movably hinged to the outer side of the top of the pier seat 6 through a first pin shaft, and rotates around the hinged end of the support rod and the pier seat 6; one end of the support rod 3, which is close to the pier seat 6, is provided with a threaded hole, a bolt is arranged in the threaded hole, a nut aligned with the threaded hole is welded above the pier seat 6, and the bolt is matched and fastened with the nut to horizontally lock the support rod 3 outside the pier seat 6; when the supporting rod 3 needs to be overturned and recovered to the pier seat 6, the supporting rod 3 can be folded and overturned only by loosening and drawing out the fastening bolt.

Fourth embodiment

Different from the third embodiment, as a preferable mode, as shown in fig. 3, the support rod 3 is movably hinged to the outer side of the top of the pier seat 6 through a second pin shaft 3.1 and rotates around the hinged end of the support rod and the pier seat 6; a groove 6.1 is formed in a preset position of the side wall of the pier seat 6, a pull rod 3.2 for controlling the turning degree is arranged between the support rod 3 and the pier seat 6, and the pull rod 3.2 can slide along the groove 6.1; when the pull rod slides upwards to the top end of the groove 6.1, the support rod 3 is turned downwards by 90 degrees through a second pin shaft 3.1 and is in a folded state; when pull rod 3.2 gliding extremely when recess 6.1 bottom, bracing piece 3 upwards overturns through second round pin axle 3.1 to expand completely and be in fold condition under the operator's upward pulling force effect, pull rod 3.2 pins bracing piece 3, pier base 6 this moment.

It should be noted that, only some embodiments for realizing the turning and folding of the support rod 3 are listed above, the present invention is not limited to the embodiments shown herein, and in the case of no conflict, a person skilled in the art may make simple modification, equivalent change and modification to the above embodiments according to actual situations, or combine related technical features in the above examples with each other to achieve corresponding technical effects, all of which belong to the scope of the technical solution of the present invention, and specific details of various combinations are not repeated herein.

Sixth embodiment

The embodiment relates to an electric remote control kelly bar pulling and feeding device, which comprises a remote control motor 1, a remote controller 2, a support rod 3, a diversion pulley block 4, a steel wire rope 5 and a pier seat 6, wherein the diversion pulley block 4 comprises a first pulley 4.1, a second pulley 4.2, a third pulley 4.3 and a fourth pulley 4.4, the pier seat 6 is arranged on a drilling platform surface, one end of the support rod 3 is rotatably connected with one end of the top of the pier seat 6, which is close to a rat hole, the other end of the support rod 3 is fixedly connected with a first pulley 4.1, and the first pulley 4.1 and the support rod 3 are positioned on the same horizontal line; one end of the top of the pier seat 6, which is far away from the rat hole, is provided with a local outward extending section, the second pulley 4.2 is vertically fixed on the local outward extending section of the top of the pier seat 6, the third pulley 4.3 is vertically fixed on the drilling platform surface, and the third pulley 4.3 and the second pulley 4.2 are positioned on the same vertical line; one end of the steel wire rope 5 is connected to the remote control motor 1, the other end of the steel wire rope 5 is connected to the kelly bar after sequentially passing through the fourth pulley 4.4, the third pulley 4.3, the second pulley 4.2 and the first pulley 4.1, further, the remote controller 2 controls the remote control motor 1 to rotate forwards or backwards, and preferably, the remote control motor 1 is a speed-adjustable motor with the speed of 0-20 m/min.

Furthermore, the invention leads the kelly bar to be pulled to the line of the rat hole, and the kelly bar can be accurately stopped at the rat hole without deviation through the line by pre-measuring and realizing accurate positioning through the length of the horizontal support rod 3.

The embodiment also provides a method for pulling the kelly bar to enter and exit the rat hole by using the electric remote control kelly bar pulling and sending device, which comprises the following steps:

s1, installing the remote control motor 1 at one corner of the farthest end of the drill floor, and fixing the pier seat 6 at a position close to the rat hole on the surface of the drill floor;

s2, fixedly connecting a first pulley 4.1 which is horizontally arranged at the other end of the supporting rod 3, hinging one end of the supporting rod 3 to one end of the top of the pier seat 6 which is close to the rat hole, vertically arranging a second pulley 4.2 at the other end of the top of the pier seat 6 which is far away from the rat hole, and vertically arranging a third pulley 4.3 on the drilling platform surface below the second pulley 4.2;

s3, arranging a fourth pulley 4.4 at a 90-degree included angle formed between the remote control motor 1 and the third pulley 4.3, and vertically fixing the fourth pulley on the surface of the drilling platform;

s4, connecting one end of a steel wire rope 5 to the remote control motor 1, and fixing the other end of the steel wire rope 5 on a kelly bar after sequentially passing through a fourth pulley 4.4, a third pulley 4.3, a second pulley 4.2 and a first pulley 4.1;

s5, when the device is used, the support rod 3 is made to be in a horizontal state, then the remote control switch 2 is turned on, the remote control motor 1 is controlled to rotate forwards, the steel wire rope 5 is tightened when the remote control motor 1 rotates forwards, and the steel wire rope 5 pulls the kelly bar to the position above the rat hole from the wellhead under the action of the turning pulley block 4;

s6, when the kelly is aligned with the rat cave entrance, the operator closes the remote switch 2, the remote control motor 1 stops rotating, the driller lowers the kelly and enters the rat cave;

s7, when the kelly bar goes out of the rat hole, the remote control motor 1 is controlled to rotate reversely through the remote control switch 2, the steel wire rope 5 is loosened when the remote control motor 1 rotates reversely, and the kelly bar is pulled out of the piling hole along with the steel wire rope 2 and moves to a well mouth;

and S8, the support rod 3 is folded back.

In conclusion, the booster device for pushing and pulling the kelly bar into and out of the rat hole instead of manpower is designed, the kelly bar can be stably pulled and sent into the rat hole within 30 seconds, no manpower is required to be involved midway, no drilling floor area and escape passage are occupied, and no installation difficulty exists. The invention has the advantages of simple structure, accurate positioning, capability of greatly reducing the labor intensity of drilling workers when pushing and pulling the kelly bar to enter and exit the rat hole, safe, convenient, labor-saving and efficient operation, and the like.

Parts of the above embodiments that are not specifically described are well known components and conventional structures or conventional means in the art and will not be described in detail herein.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Additionally, the terms first and second … … are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.