阅读说明：本技术 一种新型轮胎压延锭子房穿线设备及工艺 (Novel threading equipment and process for tire calendering spindle house ) 是由 王世鑫 延凯 许景刚 郝树德 于 2021-01-26 设计创作，主要内容包括：本发明属于轮胎半制品制造技术领域,涉及一种新型轮胎压延锭子房牵引穿线设备及工艺。所述设备包括锭子架组件、分穿线板组件和总穿线板组件,锭子架组件上设置有位置可调的用于牵引穿线的链式牵引系统；所述工艺包括使用所述设备用于轮胎压延锭子房牵引穿线的工艺,进行钢帘线牵引时,将钢帘线头夹挂在链式牵引机构的挂钩上,伺服电机带动钢帘线头牵引至锭子架的分穿线板的有穿线板侧；操作人员依次拿下线头,根据穿线标准选择对应分穿线板孔位进行穿线,将分穿线板的穿线穿入总穿线板的对应位置,完成钢帘线牵引及穿线作业。本发明实现了钢帘线的自动化牵引,改变了原有的人工牵引钢帘线的费时费力的缺点,减少穿线错误问题的发生。(The invention belongs to the technical field of tire semi-finished product manufacturing, and relates to novel tire calendering spindle house traction threading equipment and a process. The equipment comprises a spindle frame assembly, a threading board dividing assembly and a general threading board assembly, wherein a chain type traction system which is adjustable in position and used for traction threading is arranged on the spindle frame assembly; the process comprises the process that the equipment is used for traction threading of a tire calendering spindle house, when steel cords are dragged, the heads of the steel cords are clamped and hung on hooks of a chain type traction mechanism, and a servo motor drives the heads of the steel cords to be dragged to the side, with threading plates, of threading plates of a spindle frame; an operator takes off the thread ends in sequence, corresponding threading plate hole positions are selected according to threading standards to thread, the threads of the divided threading plates penetrate into corresponding positions of the main threading plate, and steel cord traction and threading operation is completed. The invention realizes the automatic traction of the steel cord, overcomes the defects of time and labor waste of the original manual traction of the steel cord, and reduces the problem of threading errors.)

1. A novel threading device for a tire calendering spindle room comprises a spindle frame assembly, a sub-threading plate assembly and a main threading plate assembly, and is characterized in that a chain type traction system which is adjustable in position and used for traction threading is arranged on the spindle frame assembly;

the chain type traction system comprises a mechanical arm (106) with an adjustable position and a chain type traction mechanism (105) which is movably adjusted along with the mechanical arm (106);

the chain type traction mechanism (105) comprises a chain wheel (3), a chain (2), a guide rail (5) and a plurality of servo motors for controlling the chain type traction mechanism (105) to move;

the chain (2) is provided with an ordinary chain link and an abnormal chain link which are connected with each other, two L-shaped vertical extending plates which are close to and correspondingly arranged are fixed on an outer chain plate (18) of the abnormal chain link, hooks (21) for clamping and hanging steel cords are arranged at the end parts of the L-shaped vertical extending plates, I-shaped rollers (19) are installed in the middle gaps of the L-shaped vertical extending plates, the lower sides of the I-shaped rollers (19) are abutted to guide rails (5), the chain (2) is connected with the guide rails (5), and the chain (2) is correspondingly rotated under the traction of a first servo motor (1) through a chain wheel (3).

2. The new type of threading equipment for tire calendering spindle houses as claimed in claim 1, characterized by that, the chain-type traction mechanism (105) is connected with the mechanical arm (106) through the ball bearing (9), and the second servo motor (4) at the connection is operated in a way of always keeping the sprocket (3) and the guide rail (5) horizontally placed.

3. A new tyre calendering spindle house threading device as in claim 1, characterized by the fact that the end of the vertical projecting plate placed in correspondence is provided with a V-shaped groove forming a hook (21) for gripping the steel cord.

4. The novel threading equipment for the tire calendering spindle house as claimed in claim 3, wherein the corresponding vertical extending plate is provided with a round hole in the middle, a gap adjusting type linear bearing (20) is arranged in the round hole, the middle shaft of the I-shaped roller (19) is fixed on the gap adjusting type linear bearing (20), and the upper side and the lower side are arranged in the guide rail (5).

5. A novel threading device of a tire rolling spindle house as claimed in claim 3, characterized in that the number of the special-shaped chain links is determined according to the installation distance of the spindles (102) on the spindle frame (101), so that 2-3 special-shaped chain links and common chain links are distributed at intervals between adjacent spindles.

6. The novel threading equipment of the tire calendering spindle house as claimed in claim 1, wherein the threading board assembly comprises a threading board fixing frame (14), an inner threading board (15) and an outer threading board (16), both sides of the inner threading board (15) are fixed on the threading board fixing frame (14), and the outer threading board (16) is magnetically attracted on the inner threading board (15).

7. The novel threading equipment of the tire calendering spindle house as claimed in claim 1, wherein the general threading plate component comprises a general threading plate (107) which is arranged in a modularized way, and the general threading plate (107) is composed of a plurality of modules with the same size as the branch threading plates (103).

8. A novel tire calendering spindle house threading device as in claim 7, characterized by that, the modular number of the total threading plate (107) is determined according to the number of the branch threading plates (103).

9. A novel threading process of a tire calendering spindle house based on the equipment as claimed in any one of the claims 1 to 5 is characterized by comprising the following steps:

a. when the steel cord traction is carried out, the steel cord head is clamped and hung on a hook (21) of a chain type traction mechanism (105), a first servo motor (1) drives a chain wheel (3) to rotate so as to enable a chain (2) to start to rotate, and the steel cord head is continuously pulled to the threading plate side of a threading plate (103) of an ingot frame (101);

b. an operator presses a start button of a chain type traction mechanism (105) on the side of a threading plate on a spindle frame (101), the steel cord head is strictly and continuously drawn to the side of the threading plate in sequence, the operator takes off the cord head in sequence, the hole positions of the corresponding threading plate (103) are selected according to threading standards to thread, and after all threading of the row of cord heads is completed, the threading of the threading plate (103) is threaded into the corresponding position of a main threading plate (107);

c. starting a fourth servo motor (11) to rotate to drive a mechanical arm (106) to rotate to the outer side of the spindle rack (101), enabling the chain type traction mechanism (105) to move up and down to a corresponding position of another row, enabling the chain type traction mechanism (105) 05 to enter a ready traction position by resetting the fourth servo motor (11), and repeating the step a and the step b to complete all threading of the wire arranging heads of different rows;

d. threading of all the branch threading plates (103) penetrates into the general threading plate (107), and the steel cord traction and threading operation is completed.

10. A novel threading process of a tire calendering spindle house based on the equipment as claimed in any one of the claims 6 to 8 is characterized by comprising the following steps:

a. when the steel cord traction is carried out, the steel cord head is clamped and hung on a hook (21) of a chain type traction mechanism (105), a first servo motor (1) drives a chain wheel (3) to rotate so as to enable a chain (2) to start to rotate, and the steel cord head is continuously pulled to the threading plate side of a threading plate (103) of an ingot frame (101);

b. an operator presses a start button of a chain type traction mechanism (105) on the side of a threading plate on a spindle frame (101), the steel curtain thread ends are strictly and continuously drawn to the side of the threading plate in sequence, the operator takes off the thread ends in sequence, hole positions of corresponding threading plates (103) are selected according to threading standards to thread, the steel curtain thread ends pass through two layers of an inner threading plate (15) and an outer threading plate (16) of the threading plates (103) at one time, and after all thread ends in the row are threaded, the outer threading plate (16) is placed at a corresponding position of a main threading plate (107);

c. starting a fourth servo motor (11) to rotate to drive a mechanical arm (106) to rotate to the outer side of the spindle rack (101), enabling the chain type traction mechanism (105) to move up and down to a corresponding position of another row, enabling the chain type traction mechanism (105) to enter a ready traction position by resetting the fourth servo motor (11), and repeating the step a and the step b to complete all threading of the wire arranging heads of different rows;

d. and transferring all threaded outer threading plates (16) to corresponding modules of a total threading plate (107) to finish the traction and threading operation of the steel cord.

Technical Field

The invention belongs to the technical field of tire semi-finished product manufacturing, and relates to novel tire calendering spindle house traction threading equipment and a process.

Background

In the manufacturing process of the tire semi-finished product part, the process of guiding, arranging and threading the steel cord is more complicated in the rolling procedure. The existing threading method for the spindle house is that after an operator puts a spindle on a spindle frame, four or eight steel cords are clamped by hands at one time and are pulled to a branch threading plate on one side of the spindle frame from the positions of corresponding spools on the spindle frame, a row of steel cords are sequentially pulled and pass through the branch threading plate, and after the threading is finished, the bundle of steel cords is pulled from the branch threading plate and pass through a total threading plate to enter the subsequent arrangement and calendering process.

This mode needs operating personnel to carry out more and loaded down with trivial details lead wire and threading action, and intensity of labour is big, and needs to consume a large amount of time, influences work efficiency. In addition, during threading, it is sometimes even necessary to draw in a row of approximately 60 steel cords with a spindle carrier arrangement length of up to approximately 24 meters, depending on the requirements of the part of the semifinished product. When a large amount of manpower is consumed, threading errors are easy to occur due to excessive traction steel cords, mutual friction between the steel cords and rubbing of a surface coating of the steel cords are caused, the adhesion between the steel cords and rubber is influenced, and finally the performance and the safety of the tire are influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides novel threading equipment and a novel threading process for a tire calendering spindle house.

The invention is realized by adopting the following technical scheme:

a novel threading device of a tire calendering spindle room comprises a spindle frame assembly, a sub-threading plate assembly and a main threading plate assembly, wherein a chain type traction system which is adjustable in position and used for traction threading is arranged on the spindle frame assembly;

the chain type traction system comprises a mechanical arm with adjustable position and a chain type traction mechanism which is adjusted along with the movement of the mechanical arm;

the chain type traction mechanism comprises a chain wheel, a chain, a guide rail and a plurality of servo motors for controlling the chain type traction mechanism to move;

the chain is provided with an ordinary chain link and an abnormal chain link which are connected with each other, two L-shaped vertical extending plates which are close to and correspondingly arranged are fixed on an outer chain plate of the abnormal chain link, hooks for clamping and hanging steel cords are arranged at the end parts of the L-shaped vertical extending plates, an I-shaped roller is installed in the middle gap of the L-shaped vertical extending plates, the lower sides of the upper side and the lower side of the I-shaped roller are abutted against a guide rail, so that the chain is connected with the guide rail, and the chain is correspondingly rotated under the traction of a first servo motor through a chain wheel.

Furthermore, the chain type traction mechanism is connected with the mechanical arm through a ball bearing, and the second servo motor at the joint works in a mode of always keeping the chain wheel and the guide rail horizontally placed.

Furthermore, the end part of the vertically extending plate correspondingly arranged is provided with a V-shaped groove to form a hook for clamping and hanging the steel cord.

Furthermore, the corresponding vertically extending plate is provided with an adjusting linear bearing in the middle of the gap, the corresponding vertically extending plate is provided with a round hole in the middle, the round hole is internally provided with the gap adjusting linear bearing, the I-shaped roller intermediate shaft is fixed on the gap adjusting linear bearing, and the upper side and the lower side of the I-shaped roller intermediate shaft are installed in the guide rail.

Furthermore, the number of the special-shaped chain links is determined according to the installation distance of the spindles on the spindle frame, so that 2-3 special-shaped chain links and common chain links are uniformly distributed between adjacent spindles at intervals.

Furthermore, divide the threading board subassembly including dividing threading board mount, inlayer threading board and outer threading board, inlayer threading board both sides are fixed in on dividing the threading board mount, and outer threading board magnetism is inhaled on the inlayer threading board.

Furthermore, total threading board subassembly includes the total threading board of modularization setting, and total threading board comprises a plurality of and divides the module that the threading board size is the same.

Furthermore, the modularization number of the total threading plates is determined according to the number of the branch threading plates.

A novel tire calendering spindle house threading process based on the equipment comprises the following steps:

a. when steel cord traction is carried out, a steel cord head is clamped and hung on a hook of a chain type traction mechanism, a servo motor drives a chain wheel to rotate so as to enable a chain to start rotating, and the steel cord head is continuously pulled to the side with a threading plate of an ingot frame strictly according to the clamping and hanging sequence;

b. an operator presses a start button of the chain type traction mechanism on the side of the spindle frame with the threading plate, the steel cord head is strictly and continuously drawn to the side of the threading plate in sequence, the operator takes off the cord head in sequence, the hole positions of the corresponding threading plate are selected for threading according to threading standards, and after all threading of the row of cord heads is completed, threading of the sub threading plates is conducted to the corresponding positions of the main threading plate;

c. starting a fourth servo motor to rotate to drive the mechanical arm to rotate to the outer side of the spindle frame, enabling the chain type traction mechanism to move up and down to a corresponding position of another row, enabling the chain type traction mechanism to enter a traction preparation position by resetting the fourth servo motor, and repeating the step a and the step b to complete all threading of the wire arranging heads of different rows;

d. threading of all the sub-threading plates penetrates into the main threading plate, and steel cord traction and threading operation is completed.

Further, the novel tire calendering spindle house threading process based on the equipment can further comprise the following steps:

a. when the steel cord traction is carried out, the steel cord head is clamped and hung on a hook of a chain type traction mechanism, a servo motor drives a chain wheel to rotate so as to enable a chain to start rotating, and the steel cord head is continuously and strictly drawn to the threading plate side of the threading plate of the spindle frame in sequence;

b. an operator presses a start button of a chain type traction mechanism on the side of a threading plate of a spindle frame, the steel cord end is strictly and continuously drawn to the side of the threading plate in sequence, the operator takes off the end of the cord in sequence, the hole positions of the corresponding threading plates are selected according to threading standards to thread, the steel cord end passes through the two layers of the inner threading plate and the outer threading plate of the threading plates at one time, and after all the ends of the cords of the row are threaded, the outer threading plate is placed at the corresponding position of the total threading plate;

c. starting a fourth servo motor to rotate to drive the mechanical arm to rotate to the outer side of the spindle frame, enabling the chain type traction mechanism to move up and down to a corresponding position of another row, enabling the chain type traction mechanism to enter a traction preparation position by resetting the fourth servo motor, and repeating the step a and the step b to complete all threading of the wire arranging heads of different rows;

d. and transferring all threaded outer-layer threading plates to corresponding modules of the main threading plate to finish the traction and threading operation of the steel cord.

The invention has the beneficial effects that: by adopting the novel tire calendering spindle house threading equipment and the process, the mechanical arm and the chain type traction mechanism are arranged, so that the automatic traction of the steel cord and the reduction of the threading times of the steel cord are realized, the defects of time waste and labor waste of the original manual traction of the steel cord are changed, the secondary threading of a steel cord threading plate is avoided, and the problem of threading errors is reduced; the two layers of the wire dividing plates are arranged, the threading times are reduced due to the modular design of the main wire dividing plate, the chain type traction mechanism is drawn to the steel cord head on the side of the wire dividing plate, the sequence of the chain type traction mechanism is strictly in accordance with the sequence of clamping and hanging the chain type traction mechanism to the special-shaped chain links, threading errors can be reduced during threading, the mutual friction between the steel cords is avoided, the surface coating of the steel cord is scraped, and the gluing with sizing materials is influenced.

Drawings

FIG. 1 is a schematic structural view of the towing overall layout of the present invention;

FIG. 2 is an enlarged, fragmentary, schematic structural view of the chain traction mechanism of the present invention;

fig. 3 is a schematic structural view of the ball screw mechanism of the present invention;

FIG. 4 is a partially enlarged schematic view of a portion of the robotic arm of the present invention;

FIG. 5 is a schematic structural view of a thread separating plate on the spindle carrier of the present invention;

FIG. 6 is a schematic view of the overall stringing board according to the present invention;

FIG. 7 is a schematic structural view of a profile link outer link plate of the present invention;

in the figure:

101-spindle rack, 102-spindle, 103-threading board, 104-ball screw, 105-chain traction mechanism and 106-mechanical arm; 107-a general threading plate which is provided with a thread,

the automatic threading machine comprises a first servo motor 1, a first chain 2, a second servo motor 3, a chain wheel 4, a second servo motor 5, a guide rail 6, a third servo motor 7, a lead screw body 7, a lead screw 8, a ball bearing 9, a steel rod 10, a fourth servo motor 11, a U-shaped plate 12, a lead screw nut 13, a threading plate fixing frame 14, an inner threading plate 15, an outer threading plate 16, an outer threading plate 18, an I-shaped roller 19, a gap adjustment type linear bearing 20 and a hook 21.

Detailed Description

In order to make the purpose and technical solution of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.

The invention is based on the existing tire rolling equipment and process foundation, and mainly installs a set of chain type traction system on the existing rolling spindle house spindle frame 101, wherein the chain type traction system is composed of a ball screw 104, a chain type traction mechanism 105, a mechanical arm 106 and the like. A mechanical arm 106 with an adjustable position is additionally arranged on the spindle frame 101 to adjust and support the position of the chain type traction mechanism 105, so that the traction of steel cords in different rows of the spindle frame 101 is realized.

As shown in fig. 1 to 7, the novel threading equipment for the tire calendering spindle room comprises a spindle frame assembly, a sub-threading plate assembly and a main threading plate assembly, wherein a position-adjustable chain type traction system for traction threading is arranged on the spindle frame assembly.

The chain traction system includes a position adjustable robot arm 106 and a chain traction mechanism 105 that is movably adjusted with the robot arm 106.

The chain type traction mechanism 105 comprises a chain wheel 3, a chain 2, a guide rail 5 and a plurality of servo motors for controlling the position of the chain type traction mechanism 105 to move; since the distance of the spindle carrier 101 of the spindle carrier assembly is long, the guide rail 5 is provided to prevent the chain 2 from being derailed.

The chain 2 is provided with ordinary chain links and profile chain links connected to each other. The profile links are designed according to the desired mode of operation of the chain traction mechanism 105. It provides two L-shaped vertical projecting plates arranged closely and correspondingly on the outer link plate 18 of the chain link and cuts an approximately "v" -shaped groove at its end, forming a hook 21, by which steel cords of different diameters are gripped at increasingly smaller intervals. The L-shaped vertical extension plate is welded and fixed by a steel plate with the same material as the outer chain plate 18, and a circular inner hole is formed in the middle of the L-shaped vertical extension plate for fixing a clearance adjustment type linear bearing 20. An intermediate shaft of the I-shaped roller 19 is fixed on the clearance adjustment type linear bearing 20, the upper and lower side wheels are arranged in the guide rail 5 to realize the connection between the chain 2 and the guide rail 5, the chain 2 correspondingly rotates under the traction of the first servo motor 1 through the chain wheel 3, and the steel cord head is continuously dragged to the threading plate side of the spindle frame 101. The servomotor used here is selected mainly with regard to its torque, so that the row of steel cords can be pulled out of the spindle 102, taking into account the friction between the i-roller 19 and the guide rail 5.

The steel cord clamp is hung on a hook 21 of a special-shaped chain link used by the chain type traction mechanism 105, the cost is saved, the number of the special-shaped chain links is set by taking the arrangement distance of the spindles 102 on the spindle frame 101 as reference, the special-shaped chain links and the common chain links are uniformly distributed at intervals, and two to three special-shaped chain links are ensured between every two spindles. .

The starting arm of the mechanical arm 106 is composed of a steel rod 10 and is connected to the screw 8 through a U-shaped plate 12 and a screw nut 13, the mechanical arm 106 with the adjustable position is formed by taking a ball screw 104 as a vertical main moving body, the screw rod and screw rod main body 7 comprises a screw rod 8, a third servo motor 6 is connected with the screw rod 8 through a coupler, the moving mechanical arm 106 is fixed with the screw nut 13, when the third servo motor 6 rotates, the screw nut 13 is driven by the screw rod 8 to convert a rotary motion angle into a linear motion distance according to a screw rod 8 lead of a corresponding specification, and the position movement of the mechanical arm 106 and the chain type traction mechanism 105 is realized. When the row needs to be adjusted, the fourth servo motors 11 at the revolute pairs below the mechanical arms 106 arranged at the two sides rotate simultaneously, so that the chain type traction mechanism 105 moves out of the spindle rack 101, then the third servo motors 6 on the ball screws 104 rotate to drive the screw nuts 13 to adjust the positions of the mechanical arms 106 and the chain type traction mechanism 105, the mechanical arms reach the proper position of the next row, and the fourth servo motors 11 at the revolute pairs below the mechanical arms 106 return to enable the chain type traction mechanism 105 to enter the ready traction position. The chain type traction mechanism 105 is connected with the mechanical arm 106 through the ball bearing 9, and the second servo motor 4 at the connection part works in a mode of always keeping the chain wheel 3 and the guide rail 5 horizontally placed.

As another improvement of the above embodiment, the threading dividing plate 103 side of the spindle frame 101 is provided with two layers from the original one layer of threading plate, the threading dividing plate assembly comprises a threading dividing fixing frame 14, an inner layer threading plate 15 and an outer layer threading plate 16, two sides of the inner layer threading plate 15 are fixed on the threading dividing fixing frame 14, and the outline of the outer layer threading plate 16 is made of magnetic material and is adsorbed on the inner layer threading plate 15 through magnetic force.

As another improvement of the above embodiment, the main threading board assembly includes a main threading board 107 which is arranged in a modularized manner, and the main threading board 107 is composed of a plurality of modules which have the same size as the branch threading boards 103.

The general threading plate 107 before rolling adopts a modular design and is divided into a plurality of modules. When threading the steel cord, threading two layers at one time on the side of the thread dividing plate 103, and placing the outer thread plate at the corresponding position of the total thread plate 107 after threading all the steel cords in the row.

The number of modules of the general threading plate 107 is determined according to the number of the branch threading plates 103.

A novel tire calendering spindle house threading process based on the equipment comprises the following steps:

a. when the steel cord is dragged, the steel cord head is clamped on a hook 21 of a chain type traction mechanism 105, a first servo motor 1 drives a chain wheel 3 to rotate so that a chain 2 starts to rotate, and the steel cord head is continuously dragged to the threading plate side of a threading plate 103 of an ingot frame 101;

b. an operator presses a start button of the chain type traction mechanism 105 on the side of the spindle frame 101 with the threading plate, steel cord heads are continuously and strictly pulled to the side of the threading plate in sequence, the operator takes off the cord heads in sequence, holes of the corresponding threading plate 103 are selected for threading according to threading standards, and after all threading of the row of cord heads is completed, threading of the threading plate 103 is threaded into corresponding positions of the main threading plate 107;

c. starting a fourth servo motor 11 to rotate to drive a mechanical arm 106 to rotate to the outer side of the spindle frame 101, enabling the chain type traction mechanism 105 to move up and down to a corresponding position of another row under the coordination of the ball screw mechanism, enabling the chain type traction mechanism 105 to enter a ready traction position after the fourth servo motor 11 returns, repeating the step a and the step b, and completing all threading of the wire arranging heads of different rows;

d. threading the all the branch threading plates 103 into the corresponding modules of the general threading plate 107, and finishing the traction and threading operation of the steel cord.

As another improvement of the above embodiment, a novel threading process of a tire rolling spindle house based on the above apparatus may further include the following steps:

a. when the steel cord is dragged, the steel cord head is clamped on a hook 21 of a chain type traction mechanism 105, a first servo motor 1 drives a chain wheel 3 to rotate so that a chain 2 starts to rotate, and the steel cord head is continuously dragged to the threading plate side of a threading plate 103 of an ingot frame 101;

b. an operator presses a start button of the chain type traction mechanism 105 on the side of the spindle frame 101 with the threading plate, the steel cord heads are continuously drawn to the side of the threading plate strictly according to the sequence, the operator takes off the cord heads in sequence, the holes of the threading plate 103 are selected to be corresponding to the threading standard for threading, the steel cord heads pass through two layers of the inner threading plate 15 and the outer threading plate 16 of the threading plate 103 at one time, and after all the thread heads of the row are threaded, the outer threading plate 16 is placed at the position corresponding to the main threading plate 107, so that the threading times can be effectively reduced;

c. starting a fourth servo motor 11 to rotate to drive a mechanical arm 106 to rotate to the outer side of the spindle frame 101, enabling the chain type traction mechanism 105 to move up and down to a corresponding position of another row under the coordination of the ball screw mechanism, enabling the chain type traction mechanism 105 to enter a ready traction position after the fourth servo motor 11 returns, repeating the step a and the step b, and completing all threading of the wire arranging heads of different rows;

d. all the threaded outer threading plates 16 are transferred to the corresponding modules of the general threading plate 107, and the steel cord traction and threading operation is completed.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention is not to be considered as limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.