阅读说明：本技术 一种阻燃型双壁波纹管及其加工工艺 (Flame-retardant double-wall corrugated pipe and processing technology thereof ) 是由 刘俊峰 汪进南 潘学东 于 2021-08-02 设计创作，主要内容包括：本发明公开一种阻燃型双壁波纹管及其加工工艺,涉及波纹管加工技术领域,包括1、一种阻燃型双壁波纹管的加工工艺,其特征在于,包括以下步骤：将原料进行混合,经漏斗输送至挤出机中；挤出机经螺杆将原料挤出至定型模具中得到管状材料,待管状材料内外壁冷却成型后得到管材；将管材整体冷却至室温,再输送至裁切装置中；启动裁切装置,对管材进行定长裁切,得到产品。本发明通过裁切装置,可以提高管材在加工过程的效率和质量,通过限位传动器,可以将板材输送至装置中,结构简单,操控方便,并且限位传动器的侧面设置有连接块和弹性块,可以更好的与波纹管的凹陷部位进行贴合,避免在传输时出现打滑的问题。(The invention discloses a flame-retardant double-wall corrugated pipe and a processing technology thereof, relates to the technical field of corrugated pipe processing, and comprises 1. the processing technology of the flame-retardant double-wall corrugated pipe, and is characterized by comprising the following steps: mixing the raw materials, and conveying the mixture to an extruder through a funnel; extruding the raw materials into a shaping mold by an extruder through a screw to obtain a tubular material, and cooling and molding the inner wall and the outer wall of the tubular material to obtain a pipe; cooling the whole pipe to room temperature, and conveying the pipe to a cutting device; and starting the cutting device, and cutting the pipe at a fixed length to obtain a product. According to the invention, through the cutting device, the efficiency and the quality of the pipe in the processing process can be improved, the plate can be conveyed into the device through the limiting driver, the structure is simple, the operation and the control are convenient, and the connecting block and the elastic block are arranged on the side surface of the limiting driver, so that the plate can be better attached to the concave part of the corrugated pipe, and the problem of slipping during the transmission is avoided.)

1. The processing technology of the flame-retardant double-wall corrugated pipe is characterized by comprising the following steps of:

the method comprises the following steps: mixing the raw materials, and conveying the mixture to an extruder through a funnel;

step two: extruding the raw materials into a shaping mold by an extruder through a screw to obtain a tubular material, and cooling and molding the inner wall and the outer wall of the tubular material to obtain a pipe;

step three: cooling the whole pipe to room temperature, and conveying the pipe to a cutting device;

step four: and starting the cutting device, and cutting the pipe at a fixed length to obtain a product.

2. The process for manufacturing the flame retardant double-wall corrugated pipe according to claim 1, wherein the cutting device is used in a method comprising the following steps:

s1: the pipe is pulled into the two groups of limiting drivers (5), the limiting drivers (5) are started, and the pipe is moved along the feeding sliding plate (2) until the pipe penetrates through the outer wall clamp holder (8) and extends into the pipe supporting box (9);

s2: starting an outer wall clamp holder (8) to clamp and fix the outer side wall of the pipe positioned in the cutting box (1), and starting a pipe inner wall support (10) to clamp and fix the inner wall of the pipe positioned in the pipe support box (9);

s3: starting a cutting driver (6), cutting the pipe by a cutter (7) to obtain a cut section and an uncut section, and starting an outer wall clamp holder (8) and a pipe inner wall support (10) to separate the cut section from the pipe;

s4: starting the cutting driver (6) again to separate the cut section and the uncut section of the pipe;

s5: and starting the limiting driver (5), driving the uncut section of the pipe to move, moving the cut section of the pipe out of the cutting device, and repeating the steps to cut the uncut section of the pipe.

3. The process for manufacturing the flame retardant double-wall corrugated pipe according to claim 2, wherein in the step S1, the moving speed of the pipe is 10 to 15 m/min.

4. The processing technology of the flame retardant double-wall corrugated pipe according to claim 1, wherein the raw materials in the first step comprise the following components in parts by weight: 85-97 parts of high-density polyethylene, 2-3.5 parts of color master batch, 1-2.5 parts of lubricant, 3-11 parts of flame retardant, 15-22 parts of reinforcing agent, 25-36 parts of light calcium carbonate, 0.7-1.3 parts of titanium dioxide, 20-25 parts of flame-retardant master batch and 2-3.5 parts of antioxidant.

5. The processing technology of the flame-retardant double-wall corrugated pipe according to claim 4, wherein the flame retardant comprises the following components in parts by weight: 10-15 parts of polyphosphoric acid, 7-11 parts of antimony trioxide, 5-9 parts of tetrabromobisphenol A, 8-12 parts of calcium fluoride and the balance of diatomite.

6. The process for manufacturing the flame retardant double-wall corrugated pipe according to claim 1, wherein the cut length of the pipe in the fourth step is 2-7 m.

7. The process according to claim 6, wherein in the fourth step, the polished surface smoothness of the pipe is 20-25 Ra.

8. A flame retardant double-walled corrugated pipe, wherein the flame retardant double-walled corrugated pipe is processed according to any one of claims 1 to 7.

Technical Field

The invention relates to the technical field of corrugated pipe processing, in particular to a flame-retardant double-wall corrugated pipe and a processing technology thereof.

Background

The double-wall corrugated pipe has good chemical stability, aging resistance and environmental stress cracking resistance, belongs to one type of flexible pipe, has the advantages of strong external pressure resistance, low manufacturing cost, convenient use, small friction coefficient, large flow, high stability and the like, and can be added with different additives when being produced according to different use environments and use requirements, and the flame-retardant double-wall corrugated pipe is one of common types.

Through retrieval, the Chinese patent discloses a high-modulus insulating flame-retardant pp double-wall corrugated pipe and a preparation method thereof (publication number: CN 112694665A). The preparation method of the high-modulus insulating flame-retardant pp double-wall corrugated pipe comprises the steps of carrying out double-layer co-extrusion and composite extrusion through an extruder to prepare a corrugated pipe blank, penetrating the corrugated pipe blank through a rotary drum and a cooling seat of a corrugated pipe processing device, driving the corrugated pipe blank to rotate through a speed reduction motor, spraying cooling water to the whole peripheral surface of the corrugated pipe blank to cool the corrugated pipe blank, driving the corrugated pipe blank to move through two moving vehicles, moving the cooled corrugated pipe blank into the rotary drum, ironing burrs on the outer wall of the corrugated pipe blank through a heating plate, and scraping to obtain the high-modulus insulating flame-retardant pp double-wall corrugated pipe.

Current double-walled bellows need cut to the length of standard after the machine-shaping, but among the current processing technology, most needs the manual work to remove tubular product and cut, leads to machining efficiency slower to when cutting, need avoid tubular product to take place to rock.

Disclosure of Invention

The invention aims to provide a flame-retardant double-wall corrugated pipe and a processing technology thereof, and solves the following technical problems:

1. how to improve the efficiency of cutting the pipe so as to reduce the labor intensity of workers;

2. how to avoid the shaking of the pipe during processing so as to improve the processing quality.

The purpose of the invention can be realized by the following technical scheme:

a processing technology of a flame-retardant double-wall corrugated pipe comprises the following steps:

the method comprises the following steps: mixing the raw materials, and conveying the mixture to an extruder through a funnel;

step two: extruding the raw materials into a shaping mold by an extruder through a screw to obtain a tubular material, and cooling and molding the inner wall and the outer wall of the tubular material to obtain a pipe;

step three: cooling the whole pipe to room temperature, and conveying the pipe to a cutting device;

step four: starting the cutting device, cutting the pipe at a fixed length, and polishing the cut part of the pipe to obtain a product.

As a further scheme of the invention: the cutting device comprises a cutting box, wherein two groups of parallel supporting frames are arranged on one side of the cutting box, and the other side of the cutting box is provided with a pipe supporting box, the upper surfaces of the two groups of supporting frames are fixedly connected with a plurality of first hydraulic rods, the output ends of the two groups of first hydraulic rods are upward and are fixedly connected with a limit driver, the upper surface of the cutting box is provided with a cutting driver, the output end of the cutting driver extends into the cutting box and is fixedly connected with a cutter, the two sides of the cutting box are both provided with outer wall clampers which are parallel to each other, screw drivers are arranged between both sides of the cutting box and the pipe supporting box and are used for controlling the pipe supporting box to move horizontally, a self-stretching sliding plate is arranged between the pipe supporting box and the cutting box, and pipe inner wall supporters which are distributed in a staggered mode are arranged on two sides of the pipe supporting box.

As a further scheme of the invention: and a feeding sliding plate is arranged between the two groups of supporting frames, and one end of the feeding sliding plate is connected with an inlet of the cutting box and used for supporting the pipe when the pipe moves.

As a further scheme of the invention: the pipe supporting box is characterized in that a discharging sliding plate is fixedly connected to the side face of the pipe supporting box, and one end of the discharging sliding plate is abutted to the ground and used for facilitating the pipe to be moved out of the device.

As a further scheme of the invention: the cutting driver comprises a second hydraulic rod, the second hydraulic rod is horizontally placed and is fixedly connected with the upper surface of the cutting box, the output end of the second hydraulic rod faces to the pipe supporting box and is fixedly connected with a third hydraulic rod, and the output end of the third hydraulic rod extends to the inside of the cutting box and is connected with the cutter.

As a further scheme of the invention: two sets of outer wall holder all include with cutting case lateral wall fixed connection's fixed case, the equal fixedly connected with a plurality of fourth hydraulic stem in fixed case's inside, a plurality of the outer grip block of output fixedly connected with of fourth hydraulic stem, the length of outer grip block is not less than the third of cutting case length.

As a further scheme of the invention: tubular product inner wall eyelidretractor include with tubular product supporting box lateral wall fixed connection's a driving motor, a driving motor's output passes through shaft coupling fixedly connected with rotor plate, so one side fixedly connected with rotor plate of tubular product supporting box is kept away from to the rotor plate, and the opposite side of rotor plate has seted up and has accomodate the groove, fixedly connected with is used for the bracing piece that supports between the side of receiver and the rotor plate, and the inside fixedly connected with electric push rod of receiver, be provided with 30-50 contained angles between electric push rod and the rotor plate, electric push rod's output extends to the inside of accomodating the groove and rotates and be connected with the inner support plate.

As a further scheme of the invention: the limiting driver comprises a connecting box fixedly connected with a first hydraulic rod, the inside of the connecting box is connected with a plurality of gear turntables and a plurality of gear turntables in a rotating mode, the outer sides of the gear turntables are meshed and connected with a connecting belt, one side of the connecting belt extends to the outer side of the connecting box, a second driving motor is fixedly connected with the inside of the connecting box, and the output end of the second driving motor is connected with the middle part of any gear turntable and used for controlling rotation of the connecting belt.

As a further scheme of the invention: the side of connecting band is provided with the connecting block that a plurality of equidistance distributes, a plurality of equal adhesion is connected with the elasticity piece between connecting block and the connecting band.

As a further scheme of the invention: one side that the connecting band was kept away from to the connecting block is provided with the edges and corners for conveniently remove tubular product.

As a further scheme of the invention: the self-stretching sliding plate comprises a plurality of assembling rotating roller frames, each assembling rotating roller frame comprises a frame body, first limiting plates fixedly connected to the two sides of one end of the inside of the frame body, second limiting plates fixedly connected to one sides of the first limiting plates and the inside of the frame body, and rotating rollers rotatably connected between the second limiting plates and the pulling frames and close to the inside of the frame body.

As a further scheme of the invention: a sliding space is arranged between the first limiting plate and the second limiting plate, and the pulling frame is embedded in the sliding space adjacent to the assembling rotating roller frame.

As a further scheme of the invention: the using method of the cutting device comprises the following steps:

s1: the pipe is pulled into the two groups of limiting drivers, the limiting drivers are started, and the pipe is moved along the feeding sliding plate until the pipe penetrates through the outer wall clamp holder and extends into the pipe supporting box;

s2: starting an outer wall clamp holder to clamp and fix the outer side wall of the pipe positioned in the cutting box, starting a pipe inner wall support to clamp and fix the inner wall of the pipe positioned in the pipe support box;

s3: starting a cutting driver, cutting the pipe by a cutter to obtain a cut section and an uncut section, and starting an outer wall clamp holder and a pipe inner wall support to separate the cut section from the pipe;

s4: starting the cutting driver again to separate the cut section and the uncut section of the pipe;

s5: and starting the limiting driver to drive the uncut section of the pipe to move, moving the cut section of the pipe out of the cutting device, and repeating the steps to cut the uncut section of the pipe.

As a further scheme of the invention: in the step S1, the moving speed of the pipe is 10-15 m/min.

As a further scheme of the invention: the raw materials in the step one comprise the following components in parts by weight: 85-97 parts of high-density polyethylene, 2-3.5 parts of color master batch, 1-2.5 parts of lubricant, 3-11 parts of flame retardant, 15-22 parts of reinforcing agent, 25-36 parts of light calcium carbonate, 0.7-1.3 parts of titanium dioxide, 20-25 parts of flame-retardant master batch and 2-3.5 parts of antioxidant.

As a further scheme of the invention: the flame retardant comprises the following components in parts by weight: 10-15 parts of polyphosphoric acid, 7-11 parts of antimony trioxide, 5-9 parts of tetrabromobisphenol A, 8-12 parts of calcium fluoride and the balance of diatomite.

As a further scheme of the invention: the cutting length of the pipe in the fourth step is 2-7 m.

As a further scheme of the invention: in the fourth step, the surface smoothness of the polished pipe is 20-25 Ra.

The invention also discloses a flame-retardant double-wall corrugated pipe which is processed by the technical scheme.

The invention has the beneficial effects that:

compared with the prior art, the cutting device is adopted in the processing technology, and the efficiency and the quality of the pipe in the processing process can be improved through the cutting device;

the cutting device is internally provided with the limiting driver, so that the plate can be conveyed into the cutting device, the cutting device is simple in structure and convenient to operate and control, and the side surface of the limiting driver is provided with the connecting block and the elastic block, so that the connecting block and the elastic block can be better attached to the concave part of the corrugated pipe, the transmission quality can be improved, and the problem of slipping during transmission is avoided;

meanwhile, the outer wall clamp holder and the inner wall support of the pipe are arranged in the cutting device, so that the outer wall and the inner wall of the pipe can be clamped simultaneously during cutting, the problem of shaking during processing of the pipe is prevented, and the inner wall supports of the pipe are distributed in a crossed manner during clamping, so that the cutting device has good stability;

and still be provided with a plurality of auxiliary structure among the cutting device for improve the quality when cutting, through self-stretching slide and feeding slide, can reduce the frictional force that tubular product removed, prevent that tubular product from appearing the problem of damage when removing, and self-stretching slide can be according to the interval between tubular product supporting box and the cutting box and adjust by oneself, and it is convenient to control.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a side view of the cutting device of the present invention;

FIG. 3 is a cross-sectional view of a cutting box of the present invention;

FIG. 4 is a top cross-sectional view of the tube inner wall support of the present invention;

FIG. 5 is a top cross-sectional view of a spacing actuator of the present invention;

FIG. 6 is an assembly view of the self-stretching slide of the present invention.

In the figure: 1. cutting a box; 2. a feeding slide plate; 3. a support frame; 4. a first hydraulic lever; 5. a limiting driver; 6. a cutting drive; 7. a cutter; 8. an outer wall clamp holder; 9. a tube support box; 10. a tubular inner wall support; 11. a self-stretching slide plate; 12. a screw driver; 13. a discharging sliding plate; 61. a second hydraulic rod; 62. a third hydraulic lever; 81. a fixed box; 82. a fourth hydraulic lever; 83. an outer clamping plate; 101. a first drive motor; 102. a rotating plate; 103. a storage box; 104. a support bar; 105. an electric push rod; 106. a receiving groove; 107. an inner support plate; 51. a connection box; 52. a gear turntable; 53. a connecting belt; 54. a second drive motor; 55. connecting blocks; 56. an elastic block; 111. assembling a roller frame; 112. a frame body; 113. a first limit plate; 114. a second limiting plate; 115. rotating the roller; 116. and pulling the frame.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention is a process for manufacturing a flame retardant double-wall corrugated pipe, comprising the following steps:

the method comprises the following steps: mixing 92 parts of high-density polyethylene, 2.7 parts of color master batch, 1.7 parts of lubricant, 5 parts of H-800 flame retardant, 18 parts of SAS453 type reinforcing agent, 29 parts of light calcium carbonate, 1.1 parts of titanium dioxide, 23 parts of S-300M flame retardant master batch and 2.8 parts of 1010 antioxidant as raw materials, wherein the flame retardant comprises 13 parts of polyphosphoric acid, 8 parts of antimonous oxide, 8 parts of tetrabromobisphenol A, 9.5 parts of calcium fluoride and the balance of diatomite, and conveying the mixture into an extruder through a funnel;

step two: extruding the raw materials into a shaping mold by an extruder through a screw to obtain a tubular material, and cooling and molding the inner wall and the outer wall of the tubular material to obtain a pipe;

step three: cooling the whole pipe to room temperature, and conveying the pipe to a cutting device at the speed of 10 m/min;

step four: start cutting device, carry out the fixed length to tubular product and cut to 6m, polish to the position that tubular product cut to the smoothness is 25Ra, obtain fire-retardant type double-walled bellows.

The cutting device comprises a cutting box 1, wherein one side of the cutting box 1 is provided with two groups of parallel supporting frames 3, and the other side of the cutting box 1 is provided with a pipe supporting box 9, the upper surfaces of two groups of supporting frames 3 are fixedly connected with a plurality of first hydraulic rods 4, the output ends of the two groups of first hydraulic rods 4 are upward and fixedly connected with a limit driver 5, the upper surface of the cutting box 1 is provided with a cutting driver 6, the output end of the cutting driver 6 extends to the inside of the cutting box 1 and is fixedly connected with a cutter 7, the two sides of the cutting box 1 are provided with outer wall clampers 8 which are parallel to each other, and the screw drivers 12 are arranged between the two sides of the cutting box 1 and the pipe supporting box 9, the screw drivers 12 are used for controlling the pipe supporting box 9 to move horizontally, the self-stretching sliding plate 11 is arranged between the pipe supporting box 9 and the cutting box 1, and the pipe inner wall supporters 10 distributed in a staggered manner are arranged on the two sides of the pipe supporting box 9.

The feeding sliding plate 2 is placed between the two groups of supporting frames 3, and one end of the feeding sliding plate 2 is connected with an inlet of the cutting box 1 and used for supporting the pipe when the pipe moves.

The side of the pipe supporting box 9 is fixedly connected with a discharging sliding plate 13, and one end of the discharging sliding plate 13 is abutted to the ground for facilitating the pipe to be moved out of the device.

The cutting driver 6 comprises a second hydraulic rod 61, the second hydraulic rod 61 is horizontally placed and is fixedly connected with the upper surface of the cutting box 1, the output end of the second hydraulic rod 61 faces the pipe supporting box 9 and is fixedly connected with a third hydraulic rod 62, and the output end of the third hydraulic rod 62 extends to the inside of the cutting box 1 and is connected with the cutter 7.

Two sets of outer wall holders 8 all include with cutting 1 lateral wall fixed connection's fixed case 81, the equal fixedly connected with a plurality of fourth hydraulic stem 82 in fixed case 81's the inside, the outer grip block 83 of the output fixedly connected with of a plurality of fourth hydraulic stem 82, the length of outer grip block 83 is not less than the third of cutting 1 length.

Tubular product inner wall eyelidretractor 10 includes the first driving motor 101 with tubular product supporting box 9 lateral wall fixed connection, shaft coupling fixedly connected with rotor plate 102 is passed through to first driving motor 101's output, so one side fixedly connected with rotor plate 102 of tubular product supporting box 9 is kept away from to rotor plate 102, and the opposite side of rotor plate 102 has seted up and has accomodate groove 106, fixedly connected with is used for the bracing piece 104 that supports between the side of receiver 103 and the rotor plate 102, and the inside fixedly connected with electric push rod 105 of receiver 103, be provided with 45 contained angle between electric push rod 105 and the rotor plate 102, electric push rod 105's output extends to the inside of accomodating groove 106 and rotates and be connected with interior backup pad 107.

The limiting driver 5 comprises a connecting box 51 fixedly connected with the first hydraulic rod 4, a plurality of gear rotating discs 52 are rotatably connected inside the connecting box 51, connecting belts 53 are meshed and connected to the outer sides of the gear rotating discs 52, one side of each connecting belt 53 extends to the outer side of the connecting box 51, a second driving motor 54 is fixedly connected inside the connecting box 51, and the output end of each second driving motor 54 is connected with the middle part of any one gear rotating disc 52 and used for controlling the rotation of each connecting belt 53.

The side of connecting band 53 is provided with a plurality of connecting block 55 of equidistance distribution, and all adhesion between a plurality of connecting block 55 and connecting band 53 is connected with elastic block 56.

One side of connecting block 55, far away from connecting band 53, is provided with the edges and corners for conveniently remove tubular product.

From tensile slide 11 includes a plurality of equipment commentaries on classics roller frame 111, and equipment commentaries on classics roller frame 111 all includes support body 112, the first limiting plate 113 of the equal fixedly connected with in both sides of the inside one end of support body 112, and the inside equal fixedly connected with second limiting plate 114 in one side that is close to first limiting plate 113 of support body 112, the equal fixedly connected with in both sides of the support body 112 other end pulls frame 116, and support body 112 is inside to be close to between second limiting plate 114 and the pulling frame 116 to rotate and be connected with commentaries on classics roller 115.

A sliding space is provided between the first limiting plate 113 and the second limiting plate 114, and the pulling frame 116 is embedded in the sliding space of the adjacent assembly rotating roller frame 111.

The working principle of the invention is as follows:

starting the screw driver 12 to drive the pipe supporting box 9 to horizontally move, changing the distance between the pipe supporting box 9 and the cutting box 1, when the pipe supporting box 9 moves, the pulling frame 116 of each assembling roller frame 111 in the self-stretching sliding plate 11 can contact the first limiting plate 113 or the second limiting plate 114 in the adjacent assembling roller frame 111, when the pipe supporting box 9 moves, the self-stretching sliding plate 11 can be unfolded when the pipe supporting box contacts the first limiting plate 113, and when the pipe supporting box contacts the second limiting plate 114, the self-stretching sliding plate 11 can be shortened;

the pipe is pulled into the two groups of limit drivers 5, the second driving motor 54 in the limit drivers 5 is started to drive the gear turntables 52 connected with the second driving motor to rotate, so that the connecting belt 53 can be driven to rotate along the other gear turntables 52, and when the connecting belt 53 rotates, the pipe is moved along the feeding sliding plate 2 through the connecting block 55 and the elastic block 56 until the pipe penetrates through the outer wall clamp holder 8 and extends into the pipe supporting box 9;

the fourth hydraulic rod 82 in the outer wall clamp holder 8 is started to drive the outer clamping plate 83 to move, the outer side wall of the pipe positioned in the cutting box 1 is clamped and fixed, the first driving motor 101 in the pipe inner wall support 10 is started to drive the rotating plate 102 to rotate to one side of the pipe, the electric push rod 105 is driven again, the two groups of inner supporting plates 107 are extended into the pipe in a crossed mode, the pipe can rotate after the two groups of inner supporting plates 107 abut against the inner wall of the pipe, and the inner wall of the pipe positioned in the pipe supporting box 9 is clamped and fixed;

starting a third hydraulic rod 62 in the cutting driver 6 to drive the cutter 7 to descend, cutting the pipe by the cutter 7 to obtain a cut section and an uncut section, starting the outer wall clamp 8 and the pipe inner wall support 10 again, and separating the outer clamping plate 83 and the inner supporting plate 107 from the pipe;

the second hydraulic rod 61 in the cutting driver 6 is started again to separate the cut section and the uncut section of the pipe, and the pipe is determined to be cut;

and starting the limiting driver 5 to drive the uncut section of the pipe to move, pushing the cut section of the pipe to move until the cut section of the pipe is moved out of the cutting device, and repeating the steps to cut the uncut section of the pipe.

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.