CN114094939A

CN114094939A - Intelligent monitoring equipment for photovoltaic power generation maintenance work

Info

Publication number: CN114094939A
Application number: CN202111473674.XA
Authority: CN
Inventors: 杨登路
Original assignee: Hunan Tiandian Solar Energy Technology Co ltd
Current assignee: Hunan Tiandian Solar Energy Technology Co ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-02-25

Abstract

The invention relates to intelligent monitoring equipment for photovoltaic power generation maintenance work, which relates to the technical field of intelligent monitoring equipment, and the device comprises the intelligent monitoring equipment for photovoltaic power generation maintenance work, and comprises a monitoring box, a mounting plate, a connecting hole, a heat dissipation mechanism arranged in the monitoring box, a fixed mounting mechanism arranged on the mounting plate and a tensile detection mechanism arranged on the connecting hole, wherein the heat dissipation mechanism comprises vent pipes, the symmetrical positions on two sides of the monitoring box are respectively provided with a mounting hole, the two vent pipes are respectively connected with the two mounting holes, the fixed mounting mechanism comprises a monitor and clamping feet, the other ends of the four clamping feet are respectively fixedly connected with the lower part of the monitor, the tensile detection mechanism comprises a connecting wire, the corresponding position of the monitoring box is provided with a sliding hole, the side wall of the connecting wire is movably connected with the sliding hole, one end of the connecting wire, which is close to the monitor, is electrically connected with the connecting hole, in the invention, the clamping pin is movably connected with the chute to preliminarily fix the monitor.

Description

Intelligent monitoring equipment for photovoltaic power generation maintenance work

Technical Field

The invention relates to the technical field of intelligent monitoring equipment, in particular to intelligent monitoring equipment for photovoltaic power generation maintenance work.

Background

Photovoltaic power generation is a technology for directly converting light energy into electric energy by utilizing the photovoltaic effect of a semiconductor interface, mainly comprises three parts, namely a solar cell panel (assembly), a controller and an inverter, and the main components comprise electronic components.

According to CN113363855A discloses a photovoltaic power generation station control management system, "including the box, box rear end inner wall center department is fixed with main control unit through rivet connection's mode, box top inner wall both sides tip is equipped with the supplementary monitoring subassembly of unmanned aerial vehicle, the supplementary monitoring subassembly of unmanned aerial vehicle includes bin a and bin b, be equipped with unmanned aerial vehicle in the bin a, be equipped with the unmanned monitoring dolly in the bin b, box both sides end wall is equipped with the cooling subassembly, the cooling subassembly includes the flabellum, box both sides end inner wall is equipped with the ventilation groove with the flabellum junction, the flabellum sets up at the ventilation inslot".

In the prior art, core elements such as a monitor and the like are unstable in fixation, lack of a necessary heat dissipation mechanism, incapable of stretching and performing close-range detection and the like, and therefore an intelligent monitoring device for photovoltaic power generation maintenance work is provided.

Disclosure of Invention

The invention mainly aims to provide intelligent monitoring equipment for photovoltaic power generation maintenance work, which can effectively solve the problems that core elements such as a monitor and the like are unstable in fixation, lack of a necessary heat dissipation mechanism, incapable of performing stretching short-distance detection and the like in the background technology.

In order to solve the technical problems, the invention is realized by the following technical scheme: the invention relates to intelligent monitoring equipment for photovoltaic power generation maintenance work, which comprises a monitoring box, a mounting plate, a connecting hole, a heat dissipation mechanism arranged in the monitoring box, a fixed mounting mechanism arranged on the mounting plate and a tension detection mechanism arranged on the connecting hole, wherein the monitoring box is of a rectangular structure and is hollow inside, the heat dissipation mechanism comprises ventilation pipes, mounting holes are formed in symmetrical positions on two sides of the monitoring box, the two ventilation pipes are respectively connected with the two mounting holes, the fixed mounting mechanism comprises a monitor and clamping pins, four sliding grooves are formed in the mounting plate, the four clamping pins are respectively movably connected with the four sliding grooves, the other ends of the four clamping pins are respectively fixedly connected with the lower part of the monitor, the tension detection mechanism comprises a connecting wire, sliding holes are formed in corresponding positions of the monitoring box, and the side wall of the connecting wire is movably connected with the sliding holes, one end of the connecting wire, which is close to the monitor, is electrically connected with the connecting hole.

Preferably, the monitoring box further comprises a supporting plate, a box door, a rotating shaft, a display screen, a handle and an alarm lamp, wherein the supporting plate is fixedly connected with the outer lower part of the monitoring box, the box door is movably connected with the monitoring box through the rotating shaft, the display screen is arranged on the central position of one side wall of the box door, which is far away from the monitoring box, the handle is arranged on the central position of one side wall of the box door, which is far away from the monitoring box, and is located on one side, which is far away from the rotating shaft, the alarm lamp is arranged above the outer part of the monitoring box, and the alarm lamp can ensure that the whole intelligent monitoring device is in a stable and safe working state.

Preferably, the supporting plate comprises a moving assembly, the moving assembly is arranged below the supporting plate, and the moving assembly can move the whole intelligent monitoring device.

Preferably, the movable assembly comprises rotating columns, mounting seats, pulleys, mounting columns, a swivel and roadblock sensors, the four rotating columns are arranged below the supporting plate and are arranged along the supporting plate in an equally-divided circumferential manner, the other ends of the four rotating columns are movably connected with one ends, close to the supporting plate, of the four mounting seats respectively, the other ends of the mounting seats are movably connected with the four pulleys respectively, the mounting columns are arranged at the center of the lower portion of the supporting plate, the swivel is movably connected with the mounting columns, the roadblock sensors are arranged on the side wall of the swivel and are arranged along the equally-divided circumferential manner, and the roadblock sensors can detect whether obstacles block the road ahead on the ground.

Preferably, the mounting panel still includes lower cassette, the mounting panel is located the inside below central point of monitoring case and is put, two lower cassette is located mounting panel both sides wall along mounting panel axis symmetry, and lower cassette is the main part that makes things convenient for the fixed frame of fixed connection.

Preferably, the heat dissipation mechanism further comprises an air inlet cover, motors, rotary columns and fans, wherein the motors are provided with motor shafts, the rotary columns are movably connected with the two motors through the two motor shafts respectively, the fans are arranged on the side walls of the two rotary columns respectively and located at one ends far away from the motors, the air inlet cover is arranged at one end far away from the monitoring box through the two ventilation pipes respectively, and the air inlet cover is a main air inlet heat dissipation component.

Preferably, fixed mounting mechanism still includes fixed frame, goes up cassette, patch antenna and screw, the mounting panel top is located to fixed frame, and with monitor lateral wall swing joint, three the monitor top is all located to connecting hole and patch antenna, and patch antenna is located the one end that is close to the chamber door, two go up the cassette and locate fixed frame both sides wall along fixed frame axis symmetry, and suit with two lower cassette positions, two go up the cassette and pass through two screw swing joint respectively with two lower cassettes, patch antenna mainly is for transmitting digital signal setting.

Preferably, the monitor includes side link and dust tube, two the lateral wall that the chamber door was kept away from to the monitor is all located to the side link, two the dust tube respectively with two side link swing joint, the dust tube can protect the side link not to receive the pollution.

Preferably, tensile detection mechanism still includes supporting seat, mounting disc and detection post, monitoring case outside top is located to the supporting seat, the supporting seat other end and connecting wire swing joint, the one end that the connecting hole was kept away from to the connecting wire is located to the mounting disc, the mounting disc other end with detect post swing joint, the mounting disc can drive and detect the rotatory detection of post.

Preferably, the rotary column comprises a fixed frame, the side wall of the fixed frame is fixedly connected with the side wall of the ventilation pipe, a rotary hole is formed in the center of the inside of the fixed frame, the rotary column is movably connected with the rotary hole, and the fixed frame can ensure that the rotary column is located under a stable rotary environment.

The invention has the following beneficial effects:

1. in the invention, the clamping feet are movably connected with the sliding groove to primarily fix the monitor, the position of the monitor is further limited by the external fixing frame, and meanwhile, the external upper clamping seat is movably connected with the lower clamping seat through the screw to lock the position between the fixing frame and the mounting plate, so that the position of the monitor on the mounting plate is locked, and the monitor is ensured to be in a stable working environment, convenient to transport and use in different scenes;

2. according to the invention, the motor works to drive the rotary column to rotate, so that the fan is driven to rotate to radiate heat in the monitoring box, meanwhile, the air inlet cover outside the ventilation pipe can be used for ventilation and radiating between the monitoring box and the outside, and meanwhile, the air inlet cover is provided with the filter holes, so that external dust can be effectively prevented from entering the monitoring box to pollute the inside, and the integral radiating effect is greatly enhanced;

3. according to the invention, under a main detection means, a stretching detection mechanism is added, the connecting wire has stretching use performance, a user changes the position of the detection column by stretching the connecting wire, and simultaneously rotates the mounting disc to drive the rotation angle of the detection column to detect the position to be detected, so that the position to be detected can be flexibly detected conveniently, and meanwhile, the connecting wire is electrically connected with the connecting hole, so that detection data can be conveniently transmitted to the inside of the monitoring box, and intelligent monitoring at any time is facilitated.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

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

FIG. 1 is a schematic diagram of the overall structure of an intelligent monitoring device for photovoltaic power generation maintenance work according to the present invention;

FIG. 2 is a schematic front view of the structure shown in FIG. 1;

FIG. 3 is a schematic top view of the structure of FIG. 1;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 2;

FIG. 6 is a schematic cross-sectional view taken at C-C in FIG. 3;

fig. 7 is a schematic cross-sectional view taken at D-D in fig. 3.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a support plate; 2. a monitoring box; 3. a box door; 4. a rotating shaft; 5. a display screen; 6. a handle; 7. an alarm lamp; 8. mounting a plate; 9. a monitor; 10. clamping a pin; 11. a fixing frame; 12. an upper clamping seat; 13. a lower clamping seat; 14. a patch antenna; 15. connecting holes; 16. a side connection end; 17. a vent pipe; 18. an air inlet cover; 19. a motor; 20. turning the column; 21. a fan; 22. a fixed mount; 23. a dust-proof cylinder; 24. a spin column; 25. a mounting seat; 26. a pulley; 27. mounting a column; 28. rotating the ring; 29. a barrier sensor; 30. a connecting wire; 31. a supporting seat; 32. mounting a disc; 33. a detection column; 34. and (4) screws.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may 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.

Referring to fig. 1-7, the present embodiment includes a monitoring box 2, a mounting plate 8, a connecting hole 15, a heat dissipating mechanism disposed inside the monitoring box 2, a fixing mechanism disposed on the mounting plate 8, and a tension detecting mechanism disposed on the connecting hole 15, the monitoring box 2 is a rectangular parallelepiped, and be inside cavity, heat dissipation mechanism includes ventilation pipe 17, monitoring case 2 bilateral symmetry position has all seted up the mounting hole, two ventilation pipe 17 are connected with two mounting holes respectively, fixed mounting mechanism includes monitor 9 and card foot 10, four spouts have been seted up on the mounting panel 8, four card feet 10 respectively with four spout swing joint, four card foot 10 other ends all with monitor 9 below fixed connection, tensile detection mechanism includes connecting wire 30, monitoring case 2 corresponds the position and has seted up the slide opening, connecting wire 30 lateral wall and slide opening swing joint, connecting wire 30 is close to monitor 9's one end and connecting hole 15 electric connection.

Monitoring box 2 still includes backup pad 1, chamber door 3, pivot 4, display screen 5, handle 6 and

alarm lamp

7, 1 top of backup pad and the outside below fixed connection of monitoring box 2, chamber door 3 and monitoring box 2 are through 4 swing joint of pivot, display screen 5 locates a lateral wall central point that monitoring box 2 was kept away from to chamber door 3 and puts, handle 6 locates a lateral wall central point that monitoring box 2 was kept away from to chamber door 3 and puts, and be located the one side of keeping away from pivot 4, monitor box 2 outside top is located to alarm lamp 7, alarm lamp 7 can ensure that whole intelligent monitoring equipment is in under stable safe operating condition.

Backup pad 1 is including removing the subassembly, removes the subassembly and sets up in backup pad 1 below, removes the subassembly and can remove whole intelligent monitoring equipment.

The movable assembly comprises rotating columns 24, mounting seats 25, pulleys 26, mounting columns 27, a rotating ring 28 and roadblock sensors 29, four rotating columns 24 are arranged below a supporting plate 1, the four rotating columns are arranged along the supporting plate 1 in an equal-dividing circumferential mode, the other ends of the four rotating columns 24 are movably connected with one ends of the four mounting seats 25 close to the supporting plate 1 respectively, the other ends of the four mounting seats 25 are movably connected with the four pulleys 26 respectively, the mounting columns 27 are arranged at the central position below the supporting plate 1, the rotating ring 28 is movably connected with the mounting columns 27, the side walls of the rotating ring 28 are arranged on the four roadblock sensors 29 respectively, the roadblock sensors 29 are arranged along the rotating ring 28 in an equal-dividing circumferential mode, and whether obstacles block the roadblock sensors 29 can block the ground detection advancing road.

The mounting plate 8 further comprises lower clamping seats 13, the mounting plate 8 is arranged at the central position below the inner part of the monitoring box 2, the two lower clamping seats 13 are symmetrically arranged on two side walls of the mounting plate 8 along the central axis of the mounting plate 8, and the lower clamping seats 13 are main components for conveniently and fixedly connecting the fixing frame 11.

The heat dissipation mechanism further comprises an air inlet cover 18, motors 19, rotary columns 20 and fans 21, wherein the two motors 19 are respectively provided with a motor shaft, the two rotary columns 20 are respectively movably connected with the two motors 19 through the two motor shafts, the two fans 21 are respectively arranged on the side walls of the two rotary columns 20 and located at one end far away from the motors 19, the two air inlet covers 18 are respectively arranged at one ends, far away from the monitoring box 2, of the two ventilation pipes 17, and the air inlet covers 18 are main air inlet heat dissipation components.

Fixed mounting mechanism still includes fixed frame 11, go up cassette 12, patch antenna 14 and screw 34, fixed frame 11 is located 8 tops of mounting panel, and with monitor 9 lateral wall swing joint, monitor 9 top is all located to three connecting hole 15 and patch antenna 14, and patch antenna 14 is located the one end that is close to chamber door 3, two go up cassette 12 and locate fixed frame 11 both sides wall along fixed frame 11 axis symmetry, and suit with two lower cassette 13 positions, two go up cassette 12 and two lower cassette 13 respectively through two screw 34 swing joint, patch antenna 14 mainly is for transmitting digital signal setting.

Monitor 9 includes side link 16 and dust tube 23, and monitor 9 is kept away from a lateral wall of chamber door 3 all to two side links 16, and two dust tubes 23 respectively with two side links 16 swing joint, and dust tube 23 can protect side link 16 not to receive the pollution.

Tensile detection mechanism still includes supporting seat 31, mounting disc 32 and detects post 33, and monitoring box 2 outside tops are located to supporting seat 31, the supporting seat 31 other end and the 30 swing joint of connecting wire, and connecting wire 30 one end of keeping away from connecting hole 15 is located to mounting disc 32, and the mounting disc 32 other end and detection post 33 swing joint, mounting disc 32 can drive and detect the rotatory detection of post 33.

The rotary column 20 comprises a fixed frame 22, the side wall of the fixed frame 22 is fixedly connected with the side wall of the ventilation pipe 17, a rotary hole is formed in the center of the inside of the fixed frame 22, the rotary column 20 is movably connected with the rotary hole, and the fixed frame 22 can ensure that the rotary column 20 is located under a stable rotary environment.

The working principle of the invention is as follows: the model of the display screen 5 is P2.5, the model of the motor 19 is GH18, the display of the monitoring result can be realized by the external display screen 5, the box door 3 and the monitoring box 2 can be driven to open and close through the handle 6, the clamp pin 10 is movably connected with the sliding groove, the monitor 9 is preliminarily fixed, the external fixing frame 11 further limits the position of the monitor 9, meanwhile, the external upper clamping seat 12 is movably connected with the lower clamping seat 13 through the screw 34, the position between the fixing frame 11 and the mounting plate 8 is locked, further, the position of the monitor 9 on the mounting plate 8 is locked, the monitor 9 is ensured to be in a stable working environment, the transportation is convenient and the monitor is used under different scenes, in the using process, the heat dissipation needs to be carried out inside the monitoring box 2, the motor 19 in the heat dissipation mechanism works to drive the rotary column 20 to rotate, further, the fan 21 is driven to rotate to carry out heat dissipation inside the monitoring box 2, meanwhile, the air inlet cover 18 outside the ventilation pipe 17 can carry out air circulation and heat dissipation between the outside and the monitoring box 2 and the outside Handle, simultaneously the air inlet cover 18 has the filtration pore, can prevent effectively that outside dust from getting into monitoring box 2 and polluting inside, holistic radiating effect has greatly been strengthened, under main detection means, in order to increase and detect the flexibility, tensile detection mechanism has been increased, connecting wire 30 wherein possesses tensile performance of using, the user of service changes the position that detects post 33 through tensile connecting wire 30, rotatory mounting disc 32 drives detection post 33 rotation angle and treats detection position detection simultaneously, the convenience is detected the position and is carried out nimble the detection to waiting, connecting wire 30 and connecting hole 15 electric connection simultaneously, it is convenient inside to detect data transmission to monitoring box 2, convenient intelligent monitoring at any time.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an intelligent monitoring equipment for photovoltaic power generation maintenance work which characterized in that: comprises a monitoring box (2), a mounting plate (8), a connecting hole (15), a heat dissipation mechanism arranged inside the monitoring box (2), a fixed mounting mechanism arranged on the mounting plate (8) and a tensile detection mechanism arranged on the connecting hole (15), wherein the monitoring box (2) is of a cuboid structure and is hollow inside, the heat dissipation mechanism comprises ventilation pipes (17), mounting holes are formed in bilateral symmetry positions of the monitoring box (2), the two ventilation pipes (17) are respectively connected with the two mounting holes, the fixed mounting mechanism comprises a monitor (9) and clamping pins (10), four sliding grooves are formed in the mounting plate (8), the four clamping pins (10) are respectively movably connected with the four sliding grooves, the other ends of the clamping pins (10) are respectively fixedly connected with the lower part of the monitor (9), and the tensile detection mechanism comprises a connecting wire (30), the monitoring box (2) is provided with a sliding hole at a corresponding position, the side wall of the connecting wire (30) is movably connected with the sliding hole, and one end, close to the monitor (9), of the connecting wire (30) is electrically connected with the connecting hole (15).

2. The intelligent monitoring device for photovoltaic power generation maintenance work according to claim 1, characterized in that: monitoring box (2) still include backup pad (1), chamber door (3), pivot (4), display screen (5), handle (6) and alarm lamp (7), backup pad (1) top and monitoring box (2) outside below fixed connection, chamber door (3) and monitoring box (2) are through pivot (4) swing joint, a lateral wall central point that monitoring box (2) were kept away from in chamber door (3) is located in display screen (5), a lateral wall central point that monitoring box (2) was kept away from in chamber door (3) is located in handle (6), and is located the one side of keeping away from pivot (4), monitoring box (2) outside top is located in alarm lamp (7).

3. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 2, characterized in that: the supporting plate (1) comprises a moving assembly, and the moving assembly is arranged below the supporting plate (1).

4. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 3, characterized in that: the movable assembly comprises rotating columns (24), mounting seats (25), pulleys (26), mounting columns (27), a rotating ring (28) and roadblock sensors (29), wherein the rotating columns (24) are arranged below the supporting plate (1) and are arranged in an equal-dividing circumferential mode along the supporting plate (1), the other ends of the rotating columns (24) are respectively close to one end of the supporting plate (1) and are movably connected with the four mounting seats (25), the other ends of the mounting seats (25) are respectively movably connected with the four pulleys (26), the mounting columns (27) are arranged at the center of the lower portion of the supporting plate (1), the rotating ring (28) is movably connected with the mounting columns (27), and the roadblock sensors (29) are arranged on the side wall of the rotating ring (28) and are arranged in an equal-dividing circumferential mode along the rotating ring (28).

5. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 4, characterized in that: the mounting plate (8) further comprises lower clamping seats (13), the mounting plate (8) is arranged at the center of the lower portion inside the monitoring box (2), and the two lower clamping seats (13) are symmetrically arranged on two side walls of the mounting plate (8) along the central axis of the mounting plate (8).

6. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 5, characterized in that: heat dissipation mechanism still includes air inlet cover (18), motor (19), rotary column (20) and fan (21), two motor (19) all are equipped with the motor shaft, two rotary column (20) respectively with two motor (19) through two motor shaft swing joint, two rotary column (20) lateral wall is located respectively in fan (21), and is located the one end of keeping away from motor (19), two the one end of monitoring case (2) is kept away from in two ventilation pipe (17) is located respectively in air inlet cover (18).

7. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 6, characterized in that: fixed mounting mechanism still includes fixed frame (11), goes up cassette (12), wiring antenna (14) and screw (34), mounting panel (8) top is located to fixed frame (11), and with monitor (9) lateral wall swing joint, three monitor (9) top is all located in connecting hole (15) and wiring antenna (14), and wiring antenna (14) are located the one end that is close to chamber door (3), two go up cassette (12) and locate fixed frame (11) both sides wall along fixed frame (11) axis symmetry, and suit with two lower cassette (13) positions, two go up cassette (12) and two lower cassette (13) are respectively through two screw (34) swing joint.

8. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 7, characterized in that: monitor (9) are including side link (16) and dust-proof cylinder (23), two side link (16) are all located monitor (9) and are kept away from a lateral wall of chamber door (3), two dust-proof cylinder (23) respectively with two side link (16) swing joint.

9. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 8, characterized in that: tensile detection mechanism still includes supporting seat (31), mounting disc (32) and detects post (33), monitoring box (2) outside top is located in supporting seat (31), supporting seat (31) other end and connecting wire (30) swing joint, the one end that connecting wire (30) kept away from connecting hole (15) is located in mounting disc (32), mounting disc (32) other end and detection post (33) swing joint.

10. An intelligent monitoring device for photovoltaic power generation maintenance work, according to claim 9, characterized in that: the rotary column (20) comprises a fixed frame (22), the side wall of the fixed frame (22) is fixedly connected with the side wall of the ventilating pipe (17), a rotary hole is formed in the center of the inside of the fixed frame (22), and the rotary column (20) is movably connected with the rotary hole.