阅读说明：本技术 一种用于输送机的调速装置 (Speed regulating device for conveyor ) 是由 郭远军 郭幸铜 郭幸钢 于 2019-04-08 设计创作，主要内容包括：本发明公开了一种用于输送机的调速装置,包括皮带限速机构、滚轮限速机构和调速操作机构。其中滚轮限速机构与皮带滚轮连接,用于防止皮带滚轮超速运行。其中调速操作机构与滚轮限速机构连接,用于调节滚轮限速机构的运行阻力。其中皮带限速机构与输送皮带连接,用于防止输送皮带超速运行。将本发明安装在输送机上,能够保证输送机不会超速转动,不会因为超速而造成不必要的损失,本发明即使在高温、高压的恶劣环境下也能够安全、稳定的运行,可广泛用于各种需要限速的输送机上。(The invention discloses a speed regulating device for a conveyor, which comprises a belt speed limiting mechanism, a roller speed limiting mechanism and a speed regulating operating mechanism. The roller speed limiting mechanism is connected with the belt roller and used for preventing the belt roller from running at an overspeed. The speed regulating operation mechanism is connected with the roller speed limiting mechanism and is used for regulating the running resistance of the roller speed limiting mechanism. The belt speed limiting mechanism is connected with the conveying belt and used for preventing the conveying belt from running in an overspeed mode. The invention is arranged on the conveyor, can ensure that the conveyor cannot rotate at an overspeed and cause unnecessary loss due to overspeed, can safely and stably operate even in a high-temperature and high-pressure severe environment, and can be widely applied to various conveyors needing speed limitation.)

1. A governor device for a conveyor, comprising:

the roller speed limiting mechanism (100) is connected with the belt roller (700) and is used for preventing the belt roller (700) from running at an overspeed;

the belt speed limiting mechanism (300) is connected with the conveying belt (500) and is used for preventing the conveying belt (500) from running in an overspeed manner;

and the speed-regulating operating mechanism (600) is connected with the roller speed-limiting mechanism (100) and is used for regulating the running resistance of the roller speed-limiting mechanism (100).

2. The governor device for a conveyor according to claim 1, wherein the roller speed limiting mechanism (100) includes:

one end of the rotating shaft (120) is connected with the belt roller (700) through a transmission piece;

the uniform speed mechanism (130) is arranged on the rotating shaft (120) and rotates along with the rotating shaft (120), and the uniform speed mechanism (130) is provided with a first stirring blade (135);

the shell (110) is used for enclosing the uniform speed mechanism (130) and is sealed with the rotating shaft (120) to form an accommodating space, and non-Newtonian fluid is arranged in the accommodating space;

and the limiting mechanism (160) is used for limiting the axial relative position of the rotating shaft (120) in the shell (110).

3. The governor device for a conveyor according to claim 2, wherein the roller speed limiting mechanism (100) further includes:

the adjusting mechanism (140) is arranged on the rotating shaft (120), is connected with the speed regulation operating mechanism (600), and is used for adjusting the fluid resistance borne by the first stirring blade (135) during rotation when the speed regulation operating mechanism (600) works.

4. The governor device for a conveyor according to claim 2, wherein the roller speed limiting mechanism (100) further includes:

the friction mechanism (150) is arranged between the inner wall of the shell (110) and the uniform speed mechanism (130) and used for enabling the friction mechanism (150) to generate friction so as to reduce the rotating speed when the rotating speed of the rotating shaft (120) is larger than a preset value.

5. The speed control device for a conveyor according to claim 3, wherein the adjusting mechanism (140) penetrates one end of the housing (110), and the adjusting mechanism (140) has a second stirring blade overlapped with the first stirring blade (135) and relatively movable.

6. The governor device for a conveyor according to claim 5, characterized in that the adjusting mechanism (140) further includes:

the adjusting plate (141) is provided with a circular ring part and the second stirring blade, the circular ring part is sleeved on the rotating shaft (120), and one end of the circular ring part is connected with the second stirring blade;

the speed regulation operating mechanism (600) is connected with the other end of the circular ring part, is positioned outside the shell (110), and is used for driving the second stirring blade to axially move relative to the rotating shaft (120), so that the relative position of the second stirring blade and the first stirring blade (135) is adjusted.

7. The governor device for a conveyor according to any one of claims 2 to 6, wherein the constant speed mechanism (130) further includes:

the sliding sleeve (131) is sleeved on the rotating shaft (120), and a sliding groove (136) is formed in the sliding sleeve (131);

the sliding block (132) is embedded in the sliding groove (136) and can axially move relative to the sliding groove (136), and the first stirring blade (135) is connected with the sliding block (132);

one end of the connecting rod (133) is hinged with the sliding block (132), the other end of the connecting rod is hinged with the rotating shaft (120), and the connecting rod (133) drives the sliding block (132) to move axially when swinging;

and one end of the second elastic piece (134) is connected with the rotating shaft (120), and the other end of the second elastic piece is connected with the sliding block (132) and is used for providing axial pulling force between the rotating shaft (120) and the sliding block (132).

8. A device according to claim 4, wherein the friction mechanism (150) is a friction disk, and is arranged between the inner wall of the housing (110) and the constant speed mechanism (130).

9. The governor device for a conveyor according to claim 6, characterized in that the governor operating mechanism (600) includes:

the axial clamping piece (113) is connected with the shell (110) and is provided with a clamping ring for clamping the circular ring part to prevent the circular ring part from moving axially;

the axial displacement adjusting piece (614) is sleeved on the rotating shaft (120) and comprises a first displacement piece (6141) and a second displacement piece (6142) which are provided with inclined planes, the first displacement piece (6141) is connected with the axial clamping piece (113), the second displacement piece (6142) is connected with the rotating shaft (120) in a clamping manner, and when the first displacement piece (6141) rotates relative to the second displacement piece (6142), the rotating shaft (120) is driven to move relative to the adjusting plate (141);

the speed regulation rotary rod (611) is connected with the second displacement piece (6142) through a transmission piece, and the second displacement piece (6142) is driven to synchronously rotate when the speed regulation rotary rod (611) is rotated.

10. The governor device for a conveyor according to any one of claims 2 to 6, wherein the stopper mechanism (160) includes:

the limiting ring (121) is arranged on the rotating shaft (120);

the first axial limiting mechanism (161) is coaxially arranged on the rotating shaft (120) and is positioned on the outer wall of the shell (110);

and the second axial limiting mechanism (162) is coaxially arranged on the rotating shaft (120) and is positioned between the shell (110) and the limiting ring (121).

11. The speed regulating device for the conveyor according to claim 5, wherein a second regulating hole (143) is formed on the second stirring blade, and a first regulating hole (137) is formed on the first stirring blade (135).

12. The governor device for a conveyor according to claim 3, wherein the constant speed mechanism (130) further includes:

the sliding sleeve (131) is sleeved on the rotating shaft (120), and a sliding groove (136) is formed in the sliding sleeve;

the sliding block (132) is embedded in the sliding groove (136) and can move radially relative to the sliding groove (136), and the first stirring blade (135) is connected with the sliding block (132);

the cam part (138) is arranged on the rotating shaft (120) and is used for driving the sliding block (132) to move in the radial direction when the sliding sleeve (131) rotates relative to the rotating shaft (120);

and one end of the second elastic piece (134) is connected with the rotating shaft (120), and the other end of the second elastic piece is connected with the sliding block (132) and is used for providing a pulling force between the rotating shaft (120) and the sliding block (132).

13. The governor device for a conveyor according to claim 12, characterized in that the adjusting mechanism (140) further includes:

the adjusting shaft (144) is arranged in the rotating shaft (120), and an adjusting groove (145) is formed in the adjusting shaft (144);

the swing rod (146) is clamped in the adjusting groove (145), the first stirring blade (135) is provided with a circular blade handle, and the blade handle penetrates through the sliding block (132) and then is connected with the swing rod (146) and is used for adjusting the angle of the first stirring blade (135) when the swing rod (146) swings;

the speed regulation operating mechanism (600) is connected with the adjusting shaft (144) and the rotating shaft (120) and is used for driving the adjusting shaft (144) to axially move relative to the rotating shaft (120) so as to drive the swing rod (146) to swing.

14. The governor device for a conveyor according to claim 1, wherein the belt speed limiting mechanism (300) includes:

a housing (310) having a containment space within which a non-Newtonian fluid is sealingly disposed;

the speed reduction roller mechanism is wound with the conveying belt (500) and passively rotates under the motion of the conveying belt (500);

the speed reducing mechanism (330) comprises a rotating sleeve (331) and a rotating blade (334) arranged on the rotating sleeve (331), and the rotating sleeve (331) is connected with the speed reducing roller mechanism.

15. The governor device for a conveyor of claim 14, wherein the belt speed limiting mechanism further comprises:

and the second adjusting mechanism (340) is connected with the speed reducing mechanism (330) and is used for adjusting the fluid resistance received when the rotating blade (334) rotates.

16. The device according to claim 15, wherein the rotating sleeve (331) has an axial through hole and a radial sliding groove, and the second adjusting mechanism (340) comprises:

the sliding rod (341) is arranged in the rotating sleeve (331) and is used for axially moving relative to the rotating sleeve (331);

one end of the connecting rod (333) is hinged with the rotating blade (334), the other end of the connecting rod (333) is hinged with the sliding rod (341), and when the connecting rod (333) swings, the rotating blade (334) is driven to move along the radial direction of the sliding chute;

one end of the third elastic piece (337) is connected with the rotating sleeve (331), and the other end of the third elastic piece is connected with the sliding rod (341) and is used for providing axial pulling force between the rotating sleeve (331) and the sliding rod (341);

an operating member connecting the sliding rod (341) and the housing (310) for providing a pretension to the third elastic member (337).

17. A governor device for a conveyor according to claim 16, characterised in that the operating member comprises:

the screw rod sleeve (342) is sleeved on the sliding rod (341) and can rotate relative to the sliding rod (341);

the ball nut (617) is matched with the screw rod sleeve (342) and can rotate along with the axial movement of the screw rod sleeve (342), and the ball nut (617) is provided with a groove;

the button (344) is arranged on the shell (310) and is provided with a pressing part and a boss, the boss is used for being clamped with the groove, and the pressing part is used for enabling the boss to be separated from the groove;

and a fourth elastic member (345) disposed between the housing (300) and the button (344) for providing a locking force to the button (344).

18. The governor device for a conveyor according to claim 14, characterized in that the speed reduction mechanism (330) further includes:

the third axial limiting mechanism (335) is coaxially arranged between the rotating sleeve (331) and the outer wall of the shell (310);

and the fourth axial limiting mechanism (336) is coaxially arranged between the rotating sleeve (331) and the inner wall of the shell (310).

19. The device according to claim 14, wherein the inner wall of the housing (310) is provided with a friction ring (313).

20. The governor device for a conveyor according to claim 14, characterized in that the governor operating mechanism (600) includes:

and the speed regulation rotary rod (611) is connected with the ball nut (617) through a transmission piece, and the ball nut (617) is driven to synchronously rotate when the speed regulation rotary rod (611) is rotated.

21. The governor device for a conveyor according to claim 16, characterized in that the governor operating mechanism (600) includes:

a circumferential limiting piece (624), one end of which is provided with a round tube, the outer part of the round tube is connected with the speed reducing roller mechanism, and the inner part of the round tube is provided with an axial tooth socket;

the limiting ejector rod (626) is clamped inside the circular tube of the circumferential limiting piece (624) and matched with the axial tooth groove;

and the limiting rotary rod (625) is in threaded connection with the limiting ejector rod (626) and drives the limiting ejector rod (626) to axially move when rotating.

Technical Field

The invention relates to a speed regulating device, in particular to a speed regulating device for a conveyor.

Background

The conveyor is a device for transporting materials from one place to another place, is widely applied to the industrial fields of mines, metallurgy, building materials, chemical industry, electric power, ports, food processing and the like, and is used for conveying various materials. These transport devices must rely on electric motors or other power to drive their operation. Conveying device often all has its rated rotational speed, is restricted to move in certain speed, if exceed speed operation then can cause the injury, lead to the output too big, cause the jam, throw away the material, cause the waste, because these conveying device adopt the motor mostly, the rotational speed of motor can receive factors such as frequency and voltage and change, when the converter breaks down or damages, can cause the rotational speed out of control, take place the runaway accident.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a speed regulating device capable of preventing over-speed running, so that a conveyor is prevented from over-speed running.

The embodiment of the invention provides a speed regulating device for a conveyor, which comprises:

the roller speed limiting mechanism is connected with the belt roller and is used for preventing the belt roller from running in an overspeed manner;

and the belt speed limiting mechanism is connected with the conveying belt and is used for preventing the conveying belt from running in an overspeed manner.

And the speed-regulating operating mechanism is connected with the roller speed-limiting mechanism and is used for regulating the running resistance of the roller speed-limiting mechanism.

Optionally, the roller speed limiting mechanism includes:

one end of the rotating shaft is connected with the belt roller through a transmission part;

the uniform speed mechanism is arranged on the rotating shaft and rotates along with the rotating shaft, and the uniform speed mechanism is provided with a first stirring blade;

the shell is used for enclosing the uniform speed mechanism and is sealed with the rotating shaft to form an accommodating space, and non-Newtonian fluid is arranged in the accommodating space;

and the limiting mechanism is used for limiting the axial relative position of the rotating shaft in the shell.

Optionally, the roller speed limiting mechanism further includes:

and the adjusting mechanism is arranged on the rotating shaft, is connected with the speed regulating operating mechanism and is used for adjusting the fluid resistance borne by the first stirring blade during rotation when the speed regulating operating mechanism works.

Optionally, the roller speed limiting mechanism further includes:

and the friction mechanism is arranged between the inner wall of the shell and the uniform speed mechanism and used for enabling the friction mechanism to generate friction so as to reduce the rotating speed when the rotating speed of the rotating shaft is greater than a preset value.

Optionally, the adjusting mechanism penetrates through one end of the housing, and the adjusting mechanism has a second stirring blade which is overlapped with the first stirring blade and can move relatively.

Optionally, the adjusting mechanism further includes:

the adjusting plate is provided with a circular ring part and the second stirring blade, the circular ring part is sleeved on the rotating shaft, and one end of the circular ring part is connected with the second stirring blade;

the speed regulation operating mechanism is connected with the other end of the circular ring part, is positioned outside the shell and is used for driving the second stirring blade to axially move relative to the rotating shaft so as to adjust the relative position of the second stirring blade and the first stirring blade.

Optionally, the uniform speed mechanism further includes:

the sliding sleeve is sleeved on the rotating shaft and is provided with a sliding chute;

the sliding block is embedded in the sliding groove and can axially move relative to the sliding groove, and the first stirring blade is connected with the sliding block;

one end of the connecting rod is hinged with the sliding block, the other end of the connecting rod is hinged with the rotating shaft, and the connecting rod drives the sliding block to move axially when swinging;

and one end of the second elastic piece is connected with the rotating shaft, and the other end of the second elastic piece is connected with the sliding block and is used for providing axial pulling force between the rotating shaft and the sliding block.

Optionally, the friction mechanism is a friction disc, and is disposed between the inner wall of the housing and the uniform speed mechanism.

Optionally, the speed-adjusting operating mechanism includes:

the axial clamping piece is connected with the shell and is provided with a clamping ring for clamping the circular ring part to prevent the circular ring part from moving axially;

the axial displacement adjusting piece is sleeved on the rotating shaft and comprises a first displacement piece and a second displacement piece, the first displacement piece and the second displacement piece are provided with inclined planes, the first displacement piece is connected with the axial clamping piece, the second displacement piece is clamped and connected with the rotating shaft, and when the first displacement piece rotates relative to the second displacement piece, the rotating shaft is driven to move relative to the adjusting plate

And the speed regulation rotary rod is connected with the second displacement piece through a transmission piece, and drives the second displacement piece to synchronously rotate when the speed regulation rotary rod is rotated.

Optionally, the limiting mechanism includes:

the limiting ring is arranged on the rotating shaft;

the first axial limiting mechanism is coaxially arranged on the rotating shaft and is positioned on the outer wall of the shell;

and the second axial limiting mechanism is coaxially arranged on the rotating shaft and is positioned between the shell and the limiting ring.

Optionally, a second adjusting hole is formed in the second stirring blade, and a first adjusting hole is formed in the first stirring blade.

Optionally, the uniform speed mechanism further includes:

the sliding sleeve is sleeved on the rotating shaft and is provided with a sliding chute;

the sliding block is embedded in the sliding groove and can move radially relative to the sliding groove, and the first stirring blade is connected with the sliding block;

the cam part is arranged on the rotating shaft and used for driving the sliding block to move in the radial direction when the sliding sleeve rotates relative to the rotating shaft;

and one end of the second elastic piece is connected with the rotating shaft, and the other end of the second elastic piece is connected with the sliding block and used for providing pulling force between the rotating shaft and the sliding block.

Optionally, the adjusting mechanism further includes:

the adjusting shaft is arranged in the rotating shaft, and an adjusting groove is formed in the adjusting shaft;

the swing rod is clamped in the adjusting groove, the first stirring blade is provided with a circular blade handle, and the blade handle penetrates through the sliding block and is connected with the swing rod for adjusting the angle of the first stirring blade when the swing rod swings;

the speed regulation operating mechanism is connected with the adjusting shaft and the rotating shaft and used for driving the adjusting shaft to axially move relative to the rotating shaft so as to drive the swing rod to swing.

Optionally, the belt speed limiting mechanism includes:

a housing having a receiving space in which a non-Newtonian fluid is sealingly disposed;

the speed reduction roller mechanism is wound with the conveying belt and passively rotates under the motion of the conveying belt;

the speed reducing mechanism comprises a rotating sleeve and a rotating blade arranged on the rotating sleeve, and the rotating sleeve is connected with the speed reducing roller mechanism.

Optionally, the belt speed limiting mechanism further comprises:

and the second adjusting mechanism is connected with the speed reducing mechanism and is used for adjusting the fluid resistance received by the rotating blade during rotation.

Optionally, the rotating sleeve has an axial through hole and a radial sliding groove, and the second adjusting mechanism includes:

the sliding rod is arranged in the rotating sleeve and is used for axially moving relative to the rotating sleeve;

one end of the connecting rod is hinged with the rotating blade, the other end of the connecting rod is hinged with the sliding rod, and the connecting rod drives the rotating blade to move along the radial direction of the sliding groove when swinging;

one end of the third elastic piece is connected with the rotating sleeve, and the other end of the third elastic piece is connected with the sliding rod and is used for providing axial pulling force between the rotating sleeve and the sliding rod;

and the operating piece is connected with the sliding rod and the shell and is used for providing pretension force for the third elastic piece.

Optionally, the operating member includes:

the screw rod sleeve is sleeved on the sliding rod and can rotate relative to the sliding rod;

the ball nut is matched with the screw rod sleeve and can rotate along with the axial movement of the screw rod sleeve, and a groove is formed in the ball nut;

the button is arranged on the shell and is provided with a pressing part and a boss, the boss is used for being clamped with the groove, and the pressing part is used for enabling the boss to be separated from the groove;

and the fourth elastic piece is arranged between the shell and the button and used for providing clamping force for the button.

Optionally, the speed reducing mechanism further comprises:

the third axial limiting mechanism is coaxially arranged between the rotating sleeve and the outer wall of the shell;

and the fourth axial limiting mechanism is coaxially arranged between the rotating sleeve and the inner wall of the shell.

Optionally, the inner wall of the housing is provided with a friction ring.

Optionally, the speed-adjusting operating mechanism includes:

and the speed regulation rotating rod is connected with the ball nut through a transmission piece, and drives the ball nut to synchronously rotate when rotating the speed regulation rotating rod.

Optionally, the speed-adjusting operating mechanism includes:

one end of the circumferential limiting piece is provided with a circular tube, the outer part of the circular tube is connected with the speed reducing roller mechanism, and the inner part of the circular tube is provided with an axial tooth socket;

the limiting ejector rod is clamped in the circular tube of the circumferential limiting part and matched with the axial tooth groove;

and the limiting rotating rod is in threaded connection with the limiting ejector rod and drives the limiting ejector rod to axially move when rotating.

According to the speed regulating device for the conveyor, when the rotating speed of the belt roller exceeds the preset value due to an unexpected state, the speed of the roller speed limiting mechanism can be reduced, and the belt roller can stably run within the preset value.

The required speed can be selected according to the requirement of the conveyor, the working speed of the roller speed limiting mechanism can be realized by changing the size of the rotating sectional area of the first stirring blade, when the section of the first stirring blade is larger, the resistance for stirring the non-Newtonian fluid is larger, otherwise, the resistance is smaller, the resistance can also be changed by the material of the non-Newtonian fluid, when the non-Newtonian fluid is thinner, the resistance is smaller, and otherwise, when the non-Newtonian fluid is thicker, the resistance is larger. For example, when the rated rotation speed is set to be 100rpm, the rotating device drives the rotating shaft to rotate, and then drives the first stirring blade to rotate, and when the rotation speed is within 100rpm, the non-newtonian fluid is in a liquid state, the fluidity is very good, and great resistance cannot be generated. When the rotating speed is more than 100rpm, the first stirring blade rapidly stirs the non-Newtonian fluid to generate resistance, and the non-Newtonian fluid becomes thick and even becomes solid, so that the first stirring blade is subjected to great resistance, the rotating speed is limited, and the basic rotating speed is stably operated at 100 rpm.

When the non-Newtonian fluid is preferably shear thickening fluid, the viscosity of the shear thickening fluid can be well adjusted, so that the non-Newtonian fluid can adapt to rotating speeds in different ranges, such as: the critical shear rate at which shear thickening of a suspension of SiO2 particles in a shear thickening fluid occurs decreases with increasing particle size and increases with increasing particle size distribution. The shear thickening strength of the SiO2 suspension decreases with increasing particle size and decreases with increasing particle size distribution. The particle size and distribution changes the shear thickening effect of the particle suspension primarily by changing the interparticle distance and the effective concentration of the particles.

Therefore, the non-Newtonian fluid is hermetically arranged in the roller speed limiting mechanism and the shell, so that the conveying belt can rotate at a constant speed, and unnecessary loss caused by accidental overspeed of the motor is avoided. The axial relative position of the rotating shaft in the shell is limited through the limiting mechanism, and the stability and the continuity of uniform-speed rotation can be guaranteed. And different rotating speeds can be set through the structure of the uniform speed mechanism and the material of the non-Newtonian fluid, so that the device can adapt to rotating equipment with different requirements, and can safely and stably operate even in a high-temperature and high-pressure severe environment.

Drawings

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

Fig. 1 is a schematic front view of a first embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIGS. 3, 5 and 6 are perspective views of the governor operating mechanism, independently illustrating multiple orientations;

FIG. 4 shows a perspective view of the axial displacement adjuster in isolation;

FIG. 7 is a schematic longitudinal sectional view of the roller speed limiting mechanism showing the internal structure of the roller speed limiting mechanism;

FIG. 8 is an enlarged view of part B of FIG. 7;

FIG. 9 is a schematic perspective view of the roller speed limiting mechanism with the housing removed, with the interior portions of the constant speed mechanism and adjustment mechanism shown highlighted;

FIG. 10 is an exploded view of FIG. 9;

FIGS. 11 and 12 are perspective views of the roller speed limiting mechanism with portions of the housing removed, highlighting the interior portions of the constant speed mechanism and adjustment mechanism;

FIG. 13 is a view taken from FIG. 12, with the adjustment mechanism removed, more clearly showing the constant velocity mechanism portion;

FIG. 14 is a schematic sectional view of a roller speed limiting mechanism according to a second embodiment of the present invention;

FIG. 15 is a perspective view of FIG. 14 with the housing removed and with an emphasis on showing the inner constant velocity mechanism portion;

FIG. 16 is an exploded view of FIG. 15;

FIG. 17 is the perspective view of FIG. 14 with the housing and friction disk removed, with portions of the adjustment mechanism inside highlighted;

FIG. 18 is a right side view of FIG. 14 with the housing removed and with emphasis on showing the constant velocity mechanism portion;

FIG. 19 is a perspective view of one of the belt speed limiting mechanisms with a portion of the housing cut away to show internal construction;

FIG. 20 is a schematic perspective view of the belt speed limiting mechanism with portions of the housing and portions of the swivel sleeve cut away, highlighting the internal speed reducing mechanism;

FIG. 21 is a schematic longitudinal cross-sectional view of a belt speed limiting mechanism.

Detailed Description

The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.

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.

It is to be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the generic and descriptive sense only and not for purposes of limitation, as the term is used in the generic and descriptive sense, and not for purposes of limitation, unless otherwise specified or implied, and the specific reference to a device or element is intended to be a reference to a particular element, structure, or component. 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.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

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 "connected" are to be construed broadly and may, for example, be 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 in specific cases to those skilled in the art.