阅读说明：本技术 一种无卤低烟阻燃聚烯烃绝缘及护套电力电缆 (Halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable ) 是由 黄海平 凌前忠 束义如 黄进 钱灵敏 黄小龙 孙海 于 2021-01-04 设计创作，主要内容包括：本发明公开了一种无卤低烟阻燃聚烯烃绝缘及护套电力电缆,包括电缆本体,电缆本体包括聚烯烃护套层、包带层、聚烯烃绝缘层和导体,加热进料机构包括第一电机、第一绞龙、第一输送筒、第一加热器、和传动轴,加热出料机构包括第二电机、第二绞龙、连通导管、第二加热器和第二输送筒,挤出机构包括转接管、异径接头和挤出器,真空抽气机构包括真空搅拌罐、第三加热器、第三电机、密封轴承、搅拌轴和搅拌棒,第二绞龙在第二电机的带动下,向加料斗中加入原材料颗粒粉末,将熔融态的原材料输送至连通导管,原材料中的水汽和空气能够被完全除去,避免残留气泡。(The invention discloses a halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable which comprises a cable body, wherein the cable body comprises a polyolefin sheath layer, a belting layer, a polyolefin insulation layer and a conductor, a heating and feeding mechanism comprises a first motor, a first packing auger, a first conveying cylinder, a first heater and a transmission shaft, a heating and discharging mechanism comprises a second motor and a second packing auger, the extrusion mechanism comprises a transfer pipe, a reducing joint and an extruder, the vacuum air exhaust mechanism comprises a vacuum stirring tank, a third heater, a third motor, a sealing bearing, a stirring shaft and a stirring rod, raw material particle powder is added into a hopper by a second auger under the driving of the second motor, molten raw materials are conveyed to the transfer pipe, water vapor and air in the raw materials can be completely removed, and residual bubbles are avoided.)

1. The utility model provides a halogen-free low smoke flame retardant polyolefin insulation and sheath power cable, its characterized in that, includes cable body (5), cable body (5) include polyolefin sheath layer (51), band layer (52), polyolefin insulating layer (53) and conductor (54), three polyolefin insulating layer (53) have all been cup jointed in the outside of conductor (54), insulating band (52) have been cup jointed in the outside of polyolefin insulating layer (53), polyolefin sheath (51) have been cup jointed in the outside of insulating band (52), cable body (5) are made in the conductor (54) outside through the raw and other materials of extruding process every layer cladding in proper order, the extruding process includes following step:

the method comprises the following steps: raw material particle powder is added into a charging hopper (26), and is heated into a molten state and conveyed to a vacuum pumping mechanism (4) under the heating and pushing of a heating and feeding mechanism (1);

step two: the vacuum pump (27) creates a vacuum environment for the vacuum pumping mechanism (4), so that the vacuum pumping mechanism (4) eliminates bubbles in the molten raw material and removes water vapor and air in the molten raw material, and the molten raw material without water vapor and air is gathered at the bottom of the vacuum pumping mechanism (4) under the action of gravity;

step three: the heating and discharging mechanism (2) conveys the molten raw materials without water vapor and air at the bottom of the vacuum pumping mechanism (4) to the extruding mechanism (3), and the extruding mechanism (3) extrudes the molten raw materials for use.

2. The halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable according to claim 1, characterized in that heating feed mechanism (1) is installed on one side of vacuum pumping mechanism (4), heating discharge mechanism (2) is installed on vacuum pumping mechanism (4), and heating discharge mechanism (2) is located under heating feed mechanism (1), loading hopper (26) is installed on one side upper portion of heating feed mechanism (1), vacuum pump (27) is installed to the opposite side of vacuum pumping mechanism (4) to communicate with vacuum pump (27), extrusion mechanism (3) is installed to one side of heating discharge mechanism (2).

3. The halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable according to claim 1, wherein the heating and feeding mechanism (1) comprises a first motor (6), a first packing auger (7), a first conveying cylinder (8), a first heater (9) and a transmission shaft (12), one side of the first conveying cylinder (8) is communicated with the vacuum pumping mechanism (4), the first heater (9) is sleeved on the peripheral side surface of one side of the first conveying cylinder (8) close to the vacuum pumping mechanism (4), the first motor (6) is installed on the other side of the first conveying cylinder (8), the first packing auger (7) is installed inside the first conveying cylinder (8), the inner wall of the first conveying cylinder (8) is connected with the peripheral side edge of the first packing auger (7) in a sliding manner, the rotating shaft of the first packing auger (7) penetrates through one side of the first conveying cylinder (8) and is connected with the first conveying cylinder (8) in a rotating manner, the end part of a rotating shaft of the first packing auger (7) is fixedly connected with the end part of a driving shaft of the first motor (6), a loading hopper (26) is arranged at the upper side of one end of the first conveying cylinder (8), a driving gear (10) is sleeved on a driving shaft of the first motor (6), a transmission shaft (12) penetrates through the lower side of the loading hopper (26), two sides of the transmission shaft (12) are respectively and rotatably connected with the side wall of the loading hopper (26), one end of the transmission shaft (12) penetrates through the side wall of the loading hopper (26), the end part of the transmission shaft (12) is sleeved with a driven gear (11), the peripheral side surface of the transmission shaft (12) is provided with a plurality of stirring rods (13), the stirring rods (13) are uniformly distributed at equal angles and equal intervals, the stirring rod (13) is positioned inside the lower side of the charging hopper (26), and the driving gear (10) is meshed with the driven gear (11).

4. The halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable according to claim 1, wherein the heating and discharging mechanism (2) comprises a second motor (14), a second packing auger (15), a communicating conduit (16), a second heater (28) and a second conveying cylinder (29), one side of the second conveying cylinder (29) is communicated with the vacuum pumping mechanism (4), the peripheral side surface of one side of the second conveying cylinder (29) close to the vacuum pumping mechanism (4) is sleeved with the second heater (28), the other side of the second conveying cylinder (29) is provided with the second motor (14), the peripheral side surface of the second conveying cylinder (29) is close to one side of the second motor (14) and is provided with the communicating conduit (16), the interior of the second conveying cylinder (29) is provided with the second packing auger (15), the inner wall of the second conveying cylinder (29) is connected with the peripheral side surface of the second packing auger (15) in a sliding manner, the pivot axis of second auger (15) passes a lateral wall of second transport section of thick bamboo (29) and rotates with second transport section of thick bamboo (29) and is connected, the pivot axis of second auger (15) one side and the drive shaft tip fixed connection of second motor (14), the opposite side tip of second auger (15) is located the inboard bottom of vacuum pumping mechanism (4), install extruding means (3) on intercommunication pipe (16).

5. The halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable according to claim 4, wherein the extrusion mechanism (3) comprises an adapter tube (17), a reducing joint (18) and an extruder (19), one end of the adapter tube (17) is communicated with the communicating conduit (16), the other end of the adapter tube (17) is communicated with the reducing joint (18), and the lower end of the reducing joint (18) is communicated with the extruder (19).

6. The halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable according to claim 1, wherein the vacuum pumping mechanism (4) comprises a vacuum stirring tank (20), a third heater (21), a third motor (22), a sealing bearing (23), a stirring shaft (24) and a stirring rod (25), the top end of the vacuum stirring tank (20) is provided with a through hole, the sealing bearing (23) is installed in the through hole, the third motor (22) is installed on the upper side of the vacuum stirring tank (20), the driving shaft of the third motor (22) penetrates through the sealing bearing (23), the driving shaft of the third motor (22) is fixedly connected with the sealing bearing (23), the end part of the driving shaft of the third motor (22) is fixedly connected with the stirring shaft (24), the stirring shaft (24) is arranged on the inner side of the vacuum stirring tank (20) and is positioned in the center of the vacuum stirring tank (20), a plurality of stirring rods (25) are installed to the periphery side of (mixing) shaft (24), stirring rods (25) are annular array evenly distributed, a plurality of third heaters (21) are buried underground to the pipe wall inside of vacuum agitator tank (20).

Technical Field

The invention relates to the field of wires and cables, in particular to a halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable.

Background

Power cable's cable has excellent compliance and tensile strength, the polyolefin sheath makes the cable have stronger withstand voltage impact property, can play good guard action to power cable, it is low that there is not steamed low fire-retardant power cable intensity of tradition, flame retardant property is relatively poor, the protective sheath on the traditional steamed low fire-retardant power cable of steamed low cigarette probably has the moisture before processing, thereby the cable sheath that leads to processing out is relatively poor in the aspect of tensile strength, low in production efficiency, the cable that leads to processing out is relatively poor in the aspect of tensile strength, can't satisfy the production demand of not unidimensional sheath.

The existing extrusion equipment can not discharge bubbles in the molten liquid, so that the extruded cable contains a large amount of bubbles, and the molding quality of the cable is reduced.

Disclosure of Invention

The invention aims to solve the problems and the defects, provides a halogen-free low-smoke flame-retardant polyolefin insulation and sheath power cable, and improves the overall working efficiency.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a there is not steamed low fire-retardant polyolefin insulation of cigarette and sheath power cable, includes the cable body, and the cable body includes polyolefin sheath layer, band layer, polyolefin insulating layer and conductor, and the polyolefin insulating layer has all been cup jointed in the outside of three conductors, and insulating band has been cup jointed in the outside of polyolefin insulating layer, and the polyolefin sheath has been cup jointed in the outside of insulating band, and the cable body is made in the conductor outside through the raw and other materials of every layer of extrusion process cladding in proper order, and the extrusion process includes following step:

the method comprises the following steps: adding raw material particle powder into a charging hopper, heating the raw material particle powder into a molten state under the heating and pushing of a heating and feeding mechanism, and conveying the molten raw material particle powder to a vacuum pumping mechanism;

step two: the vacuum pump creates a vacuum environment for the vacuum pumping mechanism, so that the vacuum pumping mechanism eliminates bubbles in the molten raw material and removes water vapor and air in the molten raw material, and the molten raw material without water vapor and air is gathered at the bottom of the vacuum pumping mechanism under the action of gravity;

step three: the heating and discharging mechanism conveys the molten raw materials without water vapor and air at the bottom of the vacuum pumping mechanism to the extruding mechanism, and the extruding mechanism extrudes the molten raw materials for use.

As a further scheme of the invention, the heating and feeding mechanism is arranged on one side of the vacuum pumping mechanism, the heating and discharging mechanism is arranged on the vacuum pumping mechanism and is positioned right below the heating and feeding mechanism, the upper part of one side of the heating and feeding mechanism is provided with the charging hopper, the other side of the vacuum pumping mechanism is provided with the vacuum pump and is communicated with the vacuum pump, and the extruding mechanism is arranged on one side of the heating and discharging mechanism.

As a further scheme of the invention, the heating and feeding mechanism comprises a first motor, a first auger, a first conveying cylinder, a first heater and a transmission shaft, one side of the first conveying cylinder is communicated with the vacuum pumping mechanism, the outer peripheral side surface of one side of the first conveying cylinder, which is close to the vacuum pumping mechanism, is sleeved with the first heater, the other side of the first conveying cylinder is provided with the first motor, the first auger is arranged in the first conveying cylinder, the inner wall of the first conveying cylinder is in sliding connection with the peripheral side edge of the first auger, a rotating shaft of the first auger passes through the cylinder wall of one side of the first conveying cylinder and is in rotating connection with the first conveying cylinder, the rotating shaft end part of the first auger is fixedly connected with the driving shaft end part of the first motor, the upper side of one end of the first conveying cylinder is provided with a feeding hopper, the driving gear is sleeved on the driving shaft of the first motor, the lower side of the feeding hopper is provided with the transmission shaft in a penetrating way, and the, the lateral wall of loading hopper is run through to the one end of transmission shaft, and the tip of transmission shaft has cup jointed driven gear, and the periphery side-mounting of transmission shaft has a plurality of poking bars, and a plurality of poking bars are equal angular equidistant evenly distributed, and inside the poking bar was located the loading hopper downside, driving gear and driven gear engaged with each other.

As a further scheme of the invention, the heating and discharging mechanism comprises a second motor, a second packing auger, a communicating conduit, a second heater and a second conveying cylinder, one side of the second conveying cylinder is communicated with the vacuum pumping mechanism, the peripheral side surface of one side of the second conveying cylinder close to the vacuum pumping mechanism is sleeved with the second heater, the other side of the second conveying cylinder is provided with the second motor, the peripheral side surface of the second conveying cylinder close to the second motor is provided with the communicating conduit, the second packing auger is arranged in the second conveying cylinder, the inner wall of the second conveying cylinder is in sliding connection with the peripheral side surface of the second packing auger, a rotating shaft of the second packing auger passes through the cylinder wall of one side of the second conveying cylinder and is in rotating connection with the second conveying cylinder, a rotating shaft of one side of the second packing auger is fixedly connected with the end part of a driving shaft of the second motor, the end part of the other side of the second packing auger is positioned at, the communicating conduit is provided with an extruding mechanism.

As a further scheme of the invention, the extruding mechanism comprises an adapter tube, a reducing joint and an extruder, one end of the adapter tube is communicated with the communicating conduit, the other end of the adapter tube is communicated with the reducing joint, and the lower end of the reducing joint is communicated with the extruder.

According to a further scheme of the invention, the vacuum air exhaust mechanism comprises a vacuum stirring tank, a third heater, a third motor, a sealing bearing, a stirring shaft and stirring rods, wherein a through hole is formed in the top end of the vacuum stirring tank, the sealing bearing is installed in the through hole, the third motor is installed on the upper side of the vacuum stirring tank, a driving shaft of the third motor penetrates through the sealing bearing, the driving shaft of the third motor is fixedly connected with the sealing bearing, the end part of the driving shaft of the third motor is fixedly connected with the stirring shaft, the stirring shaft is arranged on the inner side of the vacuum stirring tank and located in the center of the vacuum stirring tank, a plurality of stirring rods are installed on the peripheral side face of the stirring shaft, the stirring rods are uniformly distributed in an annular array, and a plurality.

The invention has the beneficial effects that: raw material particle powder is added into a charging hopper, a first motor drives a first auger and a driving gear to rotate, the raw material particle powder conveyed by the charging hopper is conveyed to a vacuum air exhaust mechanism by the first auger, the driving gear drives a driven gear and further drives a transmission shaft to rotate, the transmission shaft drives a stirring rod to stir the raw material particle powder to prevent the raw material particle powder from being condensed in the charging hopper, a first heater heats the raw material particles conveyed in a first conveying cylinder to enable the raw material particles to be molten and convey the raw material particles into a vacuum stirring tank, a vacuum pump creates a vacuum environment in the vacuum stirring tank to enable water vapor and air in the raw material to be completely removed and avoid residual bubbles, meanwhile, a third motor rotates a stirring shaft to drive a stirring rod to stir the molten raw material, so that the bubbles are released more rapidly, and the molten raw material falls to the bottom of the vacuum stirring tank under the action, and the raw materials are conveyed into a second conveying cylinder by a second packing auger, the temperature of the raw materials is kept by a second heater and a third heater, the raw materials are kept in a molten state, the molten raw materials are conveyed to a communicating conduit by the second packing auger under the drive of a second motor, and are extruded from an extruder through an adapter tube and a reducing joint and are coated on the outer side of the cable core, so that the uniform coating is realized, and the bubbles are eliminated.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a cable body according to the present invention;

FIG. 2 is a front view of the overall structure of the present invention;

FIG. 3 is an enlarged view of circle A of FIG. 1;

FIG. 4 is a schematic side view of the heating and discharging mechanism of the present invention;

FIG. 5 is a schematic view of the vacuum pumping mechanism of the present invention;

in the figure: 1. a heating and feeding mechanism; 2. a heating and discharging mechanism; 3. an extrusion mechanism; 4. a vacuum pumping mechanism; 5. a cable body; 6. a first motor; 7. a first auger; 8. a first delivery cartridge; 9. a first heater; 10. a driving gear; 11. a driven gear; 12. a drive shaft; 13. a stirring rod; 14. a second motor; 15. a second auger; 16. a communicating conduit; 17. a transfer tube; 18. a reducing joint; 19. an extruder; 20. a vacuum stirring tank; 21. a third heater; 22. a third motor; 23. sealing the bearing; 24. a stirring shaft; 25. a stirring rod; 26. a hopper; 27. a vacuum pump; 28. a second heater; 29. a second delivery cartridge; 51. a polyolefin jacket; 52. insulating wrapping tapes; 53. a polyolefin insulating layer; 54. a conductor.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.

Please refer to fig. 1-5: the utility model provides a halogen-free low smoke flame retardant polyolefin insulation and sheath power cable, its characterized in that includes cable body 5, cable body 5 includes polyolefin sheath layer 51, band layer 52, polyolefin insulating layer 53 and conductor 54, three polyolefin insulating layer 53 has all been cup jointed in the outside of conductor 54, insulating band 52 has been cup jointed in the outside of polyolefin insulating layer 53, polyolefin sheath 51 has been cup jointed in the outside of insulating band 52, cable body 5 is prepared in proper order in the conductor 54 outside through the raw and other materials of every layer of cladding of extrusion process, the extrusion process includes the following step:

the method comprises the following steps: raw material particle powder is added into a charging hopper 26, and is heated into a molten state and conveyed to a vacuum pumping mechanism 4 under the heating and pushing of a heating and feeding mechanism 1;

step two: the vacuum pump 27 creates a vacuum environment for the vacuum pumping mechanism 4, so that the vacuum pumping mechanism 4 eliminates bubbles in the molten raw material and removes water vapor and air in the molten raw material, and the molten raw material without water vapor and air is gathered at the bottom of the vacuum pumping mechanism 4 under the action of gravity;

step three: the heating and discharging mechanism 2 conveys the molten raw materials without water vapor and air at the bottom of the vacuum pumping mechanism 4 to the extruding mechanism 3, and the extruding mechanism 3 extrudes the molten raw materials for use.

Heating feed mechanism 1 installs in one side of vacuum pumping mechanism 4, heating discharge mechanism 2 installs on vacuum pumping mechanism 4, and heating discharge mechanism 2 is located heating feed mechanism 1 under, the loading hopper 26 is installed on one side upper portion of heating feed mechanism 1, vacuum pump 27 is installed to vacuum pumping mechanism 4's opposite side to communicate with vacuum pump 27, extrusion mechanism 3 is installed to one side of heating discharge mechanism 2.

The heating and feeding mechanism 1 comprises a first motor 6, a first auger 7, a first conveying cylinder 8, a first heater 9 and a transmission shaft 12, one side of the first conveying cylinder 8 is communicated with the vacuum pumping mechanism 4, the first heater 9 is sleeved on the peripheral side surface of one side of the first conveying cylinder 8 close to the vacuum pumping mechanism 4, the first motor 6 is installed on the other side of the first conveying cylinder 8, the first auger 7 is installed inside the first conveying cylinder 8, the inner wall of the first conveying cylinder 8 is in sliding connection with the peripheral side edge of the first auger 7, a rotating shaft of the first auger 7 penetrates through the cylinder wall of one side of the first conveying cylinder 8 and is in rotating connection with the first conveying cylinder 8, the end part of the rotating shaft of the first auger 7 is fixedly connected with the end part of a driving shaft of the first motor 6, a feeding hopper 26 is installed on the upper side of one end of the first conveying cylinder 8, driving gear 10 has been cup jointed in the drive shaft of first motor 6, transmission shaft 12 is worn to be equipped with by the downside of loading hopper 26, the both sides of transmission shaft 12 rotate with the lateral wall of loading hopper 26 respectively and are connected, the lateral wall of loading hopper 26 is run through to the one end of transmission shaft 12, and driven gear 11 has been cup jointed to the tip of transmission shaft 12, the periphery side-mounting of transmission shaft 12 has a plurality of stirring rod 13, and is a plurality of stirring rod 13 is equal angular equal interval evenly distributed, stirring rod 13 is located inside loading hopper 26 downside, driving gear 10 and 11 meshes mutually.

The heating and discharging mechanism 2 comprises a second motor 14, a second packing auger 15, a communicating conduit 16, a second heater 28 and a second conveying cylinder 29, one side of the second conveying cylinder 29 is communicated with the vacuum pumping mechanism 4, the peripheral side surface of one side of the second conveying cylinder 29 close to the vacuum pumping mechanism 4 is sleeved with the second heater 28, the second motor 14 is installed on the other side of the second conveying cylinder 29, the communicating conduit 16 is installed on one side of the peripheral side surface of the second conveying cylinder 29 close to the second motor 14, the second conveying cylinder 29 is internally provided with the second packing auger 15, the inner wall of the second conveying cylinder 29 is slidably connected with the peripheral side surface of the second packing auger 15, the rotating shaft of the second packing auger 15 passes through the cylinder wall of one side of the second conveying cylinder 29 and is rotatably connected with the second conveying cylinder 29, the rotating shaft of one side of the second packing auger 15 is fixedly connected with the end part of the driving shaft of the second motor 14, the other end part of the second packing auger 15 is positioned at the bottom of the inner side of the vacuum air exhaust mechanism 4, and the communicating conduit 16 is provided with the extruding mechanism 3.

The extruding mechanism 3 comprises an adapter tube 17, a reducing joint 18 and an extruder 19, one end of the adapter tube 17 is communicated with a communicating conduit 16, the other end of the adapter tube 17 is communicated with the reducing joint 18, and the lower end of the reducing joint 18 is communicated with the extruder 19.

Vacuum air exhaust mechanism 4 includes vacuum mixing jar 20, third heater 21, third motor 22, sealed bearing 23, (mixing) shaft 24 and stirring rod 25, install sealed bearing 23 in through-hole and the through-hole has been seted up on vacuum mixing jar 20's top, third motor 22 is installed to vacuum mixing jar 20's upside, sealed bearing 23 is run through to third motor 22's drive shaft, and third motor 22's drive shaft and sealed bearing 23 fixed connection, third motor 22's drive shaft tip fixedly connected with (mixing) shaft 24, (mixing) shaft 24 sets up in vacuum mixing jar 20's inboard and is located vacuum mixing jar 20's center, a plurality of stirring rods 25 are installed to (mixing) shaft 24's periphery side, stirring rod 25 is the annular array evenly distributed, a plurality of third heaters 21 have been buried underground to vacuum mixing jar 20's pipe wall inside.

When the invention is used, raw material particle powder is added into a charging hopper 26, a first motor 6 drives a first packing auger 7 and a driving gear 10 to rotate, the raw material particle powder conveyed by the charging hopper 26 is conveyed to a vacuum pumping mechanism 4 by the first packing auger 7, the driving gear 10 drives a driven gear 11 to further drive a transmission shaft 12 to rotate, the transmission shaft 12 drives a stirring rod 13 to stir the raw material particle powder to prevent the raw material particle powder from being condensed in the charging hopper 26, a first heater 9 heats the raw material particles conveyed in a first conveying cylinder 8 to enable the raw material particles to be molten and convey the molten raw material particles to a vacuum stirring tank 20, a vacuum pump 27 makes a vacuum environment in the vacuum stirring tank 20, so that water vapor and air in the raw material can be completely removed to avoid residual bubbles, and meanwhile, a third motor 22 rotates a stirring shaft 24 to drive a stirring rod 25 to stir the raw material to more rapidly release the bubbles, under the action of gravity, the molten raw material falls to the bottom of the vacuum stirring tank 20 and is conveyed into a second conveying cylinder 29 by a second packing auger 15, a second heater 28 and a third heater 21 keep the temperature of the raw material and keep the raw material in a molten state, and the molten raw material is conveyed to the communicating conduit 16 by the second packing auger 15 under the driving of a second motor 14, extruded from the extruder 19 through the adapter tube 17 and the reducing joint 18 and coated on the outer side of the cable core 55.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.