CN218846232U - Fume exhauster - Google Patents

Abstract

This patent belongs to kitchen equipment technical field, refers in particular to a lampblack absorber, includes: a housing; the cigarette machine main body is connected with the shell, and the front end of the cigarette machine main body is provided with a cigarette machine front panel; the fan is arranged in the shell and is provided with an air suction opening for sucking oil smoke; the air guide sleeve covers the outer edge of the air suction opening of the fan, and an air inlet is formed in one side of the air guide sleeve; the flow guide cover is provided with a flow guide wall facing the air suction opening and biased towards one side of the air suction opening, and is used for enabling the oil smoke to enter the flow guide cover from the air inlet and enter the air suction opening along the biased flow guide wall. This patent is through form the area by the wind channel of making an uproar that falls that diminishes greatly in the kuppe, the oil smoke is getting into from the air intake of kuppe during the kuppe, the oil smoke along the square skew of fan gradually towards the water conservancy diversion wall of off-set to realize the direction of oil smoke motion through the off-set kuppe, prevent that the oil smoke from colliding at the kuppe at will, the noise production, thereby the realization is fallen and is fallen.

Description

Fume exhauster

Technical Field

This patent belongs to kitchen equipment technical field, refers in particular to a lampblack absorber.

Background

The traditional range hood generally has only one oil fume suction port, the working position is fixed, when the range hood faces kitchen utensils with different heights, the oil fume suction effect is different, and the oil fume can not be discharged through the range hood more.

Kitchen noise is neglected by people very easily, especially in the aspect of range hood, because of needing to use the fan blade to rotate and airs exhaust, the fan blade rotates also can lead to producing higher noise because of the impact of air current to range hood when being in the noise environment for a long time, is harmful to human body and mind. At present, noise is mainly counteracted by adding a noise reduction device on the market through sound waves, but noise generated by collision of airflow turbulence on parts is mostly ignored.

Disclosure of Invention

The purpose of this patent is to provide a range hood,

the purpose of this patent is so realized:

a range hood, comprising:

a housing;

the cigarette machine main body is connected with the shell, and the front end of the cigarette machine main body is provided with a cigarette machine front panel;

the fan is arranged in the shell and is provided with an air suction opening for sucking oil smoke; and

the air guide sleeve covers the outer edge of the air suction opening of the fan, and an air inlet is formed in one side of the air guide sleeve; the flow guide cover is provided with a flow guide wall facing the air suction opening and biased towards one side of the air suction opening, and is used for enabling the oil smoke to enter the flow guide cover from the air inlet and enter the air suction opening along the biased flow guide wall.

Furthermore, the air guide sleeve also comprises a connecting wall annularly arranged on the outer edge of the air guide wall, and the other end of the connecting wall is connected to the outer edge of an air suction opening of the fan; the connecting wall is provided with an arc-shaped top.

Furthermore, the air inlet is provided with a flow isolating plate connected between the flow guide wall and the fan and used for separating the oil smoke into a plurality of channels to be sent into the flow guide cover.

Furthermore, the flow partition plates are provided with a plurality of flow partition plates which are evenly distributed on the air inlet in sequence.

Furthermore, a plurality of first sound absorption holes are formed in the flow guide wall, and a first sound absorption layer covering the first sound absorption holes is arranged outside the flow guide wall.

Furthermore, the left side and the right side of the fan are both provided with air suction openings, and two guide covers are arranged and respectively covered on the two air suction openings;

the drainage plate is V-shaped, and two ends of the drainage plate are connected with one side edge of the two air inlets of the air guide sleeve respectively.

Furthermore, a first smoking port and a second smoking port are respectively arranged on the front panel of the cigarette machine; also comprises

The opening and closing components are arranged on the first smoking port and the second smoking port respectively, and are used for enabling the first smoking port or/and the second smoking port to be opened or enabling the first smoking port or/and the second smoking port to be closed.

Further, the front panel of the cigarette machine is obliquely arranged on the cigarette machine main body, and the first cigarette suction port and the second cigarette suction port are respectively arranged on the front panel of the cigarette machine in the front-back direction.

Further, the opening and closing assembly comprises a first cover plate and a first driving structure for driving the first cover plate to move; the first cover plate is opened outwards around the upper end of the first smoking port.

Further, the second drive structure includes the rotation driving source, and the rotation driving source is connected with the second actuating lever, and the second actuating lever is connected with the second apron.

Compared with the prior art, the patent has the outstanding and beneficial technical effects that:

1. this patent is through form the area by the wind channel of making an uproar that falls that diminishes in the kuppe, the oil smoke is getting into from the air intake of kuppe during the kuppe, the oil smoke is along the square skew of fan gradually towards the water conservancy diversion wall of biasing to realize the direction of oil smoke motion through the kuppe of biasing, prevent that the oil smoke from colliding at the kuppe at will, producing the noise, thereby realize making an uproar falls.

2. The three flow partition plates form four small air inlets with the same size, and can be used for dividing a strand of oil smoke into a plurality of strands of small oil smoke, wherein one of the small air inlets can play a role in guiding the oil smoke, and the collision between the oil smoke and the flow guide cover is reduced, so that the noise is reduced; the second one can play the oil smoke reposition of redundant personnel effect, reduces oil smoke and kuppe collision power, reduces the noise.

3. The whole area of water conservancy diversion wall in this embodiment is great, is convenient for set up the more first sound absorbing hole of quantity consequently to can set up the bigger first sound absorbing layer of area, increase sound absorbing effect.

4. The subassembly that opens and shuts of both has been configured respectively in this patent and has been controlled respectively first smoking mouth or second smoking mouth is opened, and the user accessible is opened simultaneously first smoking mouth and second smoking mouth increase the general smoking mouth size, increase the oil absorption cigarette efficiency of lampblack absorber machine.

5. This patent accessible control first smoking mouth or second smoking mouth are opened alone, deal with the different culinary art condition respectively, and the aforesaid explodes the condition of frying and stews the condition promptly, through making the single smoking mouth of fan output, increases the suction of single smoking mouth, increases the oil absorption cigarette effect.

6. According to the range hood, the first smoke suction port is arranged at the upper end of the front panel of the range hood, and when the first cover plate is opened outwards, the first cover plate is connected with the front panel of the range hood to form a cover cap covering the range hood; first mouth of cigarette is generally used for when the user explodes the stir-fry, adsorbs produced a large amount of oil smoke this moment, oil smoke upward movement with first apron inboard contacts to being sent into under the blockking of first apron in the first mouth of cigarette to prevent the oil smoke outwards diffusion, thereby increased the oil smoke absorption effect of lampblack absorber.

Drawings

Fig. 1 is a schematic structural diagram of a range hood in the present invention.

Fig. 2 is a side sectional view of fig. 1.

Figure 3 is a schematic view of the structure within the body of the smoking machine.

Fig. 4 is an enlarged view of fig. 3 at a.

Fig. 5 is an enlarged view of fig. 3 at B.

Fig. 6 is a driving schematic diagram of the second driving structure.

Figure 7 is a side sectional view of the cigarette machine body at a first web.

Fig. 8 is a schematic structural diagram of a noise reduction air duct device of a range hood.

FIG. 9 is a bottom schematic view of the pod.

The reference numerals in the figures denote the meanings:

1. a cigarette machine main body;

2. a front panel of the range hood; 21. a first smoking port; 211. a screen section; 22. a second smoking port; 23. a first linkage hole; 24. a transfer bracket;

3. an opening and closing assembly;

31. a first cover plate; 32. a first drive structure; 321. a linear drive source; 322. a first drive lever; 323. a first connecting plate; 324. a connecting end; 325. a rotating end; 326. a driving end; 327. an arc-shaped section; 328. a straight line segment;

33. a second cover plate; 34. a second drive structure; 341. a rotation drive source; 342. a second drive lever;

4. a housing; 5. a fan; 51. an air inlet; 52. a drainage plate; 521. a second sound absorption hole; 53. an air outlet;

6. a dome; 61. an air inlet; 62. a flow guide wall; 63. a connecting wall; 64. a flow isolating plate; 65. a first sound absorbing aperture.

Detailed Description

The invention will be further described with reference to specific embodiments below:

a range hood comprises a range hood main body 1, as shown in figures 1-3, the range hood main body 1 comprises an inverted triangular metal shell, and a range hood front panel 2 is obliquely arranged at the front end of the metal shell; the front panel 2 of the range hood is used for being opposite to a cooking bench, and in the cooking process of a user, oil smoke generated by cooking is firstly contacted with the front panel 2 of the range hood under the driving of the range hood; in this embodiment, the front panel 2 of the range hood is respectively provided with a first smoke suction port 21 and a second smoke suction port 22, and the fan 5 arranged in the range hood is used for sucking the oil smoke into the range hood from the first smoke suction port 21 or/and the second smoke suction port 22.

Be equipped with the subassembly 3 that opens and shuts on the lampblack absorber in this patent, it is equipped with two and sets up respectively on first mouth 21 and the second mouth 22, the subassembly 3 that opens and shuts is used for making first mouth 21 or second mouth 22 are opened, or make first mouth 21 or second mouth 22 close.

As shown in fig. 3-5, the two opening and closing assemblies 3 respectively correspond to the first smoking port 21 and the second smoking port 22; as shown in fig. 3 and 4, in the first smoking port 21, the opening and closing assembly 3 comprises a first cover plate 31 which is adapted to the shape of the first smoking port 21 and a first driving structure 32 which drives the first cover plate 31 to move; the first cover plate 31 is opened outwards around the upper end of the first cigarette suction port 21, wherein the first driving structure 32 comprises a linear driving source 321 arranged on the inner side of the front panel 2 of the cigarette machine, and the linear driving source 321 is connected with a first driving rod 322; the cigarette making machine further comprises a first connecting plate 323, and a first linkage hole 23 for the first connecting plate 323 to penetrate through is formed in the front panel 2 of the cigarette making machine; the first connecting plate 323 is provided with a connecting end 324 connected with the first cover plate 31, a rotating end 325 rotatably connected with the front panel 2 of the cigarette machine, and a driving end 326 connected with the first driving rod 322.

As shown in fig. 4, the linear driving source 321 includes a motor push rod fixed inside the front panel 2 of the cigarette machine, and one side of the motor push rod drives the first driving rod 322; the two first linkage holes 23 are respectively positioned at the left side and the right side of the front panel 2 of the cigarette making machine, and the first linkage holes 23 are in a flat strip shape and are used for being matched with the planar first connecting plate 323; accordingly, two first connection plates 323 are provided to be connected to both left and right ends of the first cover plate 31. As shown in fig. 7, the first connecting plate 323 has a C-shaped arc section 327, the arc section 327 is configured to penetrate through the first linking hole 23, and the arc structure thereof can be adapted to the rotational connection of the first cover plate 31; the first connecting plate 323 further includes a straight line section 328 connected to an end of the arc-shaped section 327, two ends of the straight line section 328 are the driving end 326 and the rotating end 325, respectively, and the other end of the arc-shaped section 327 is the connecting end 324.

With reference to fig. 7 and 4, in this embodiment, an adapting bracket 24 located on the upper side of the first connecting plate 323 is disposed on the inner side of the front panel 2 of the cigarette machine, the adapting bracket 24 is fixed on the front panel 2 of the cigarette machine by screws, the upper end of the rotating bracket is rotatably connected to the rotating end 325 of the first self-connecting plate by a rotating pin, and the driving end 326 is connected to the outer end of the first driving rod 322 by a rotating pin; the connecting end 324 of the first connecting plate 323 is provided with a connecting angle iron, and is connected with one side surface of the first cover plate 31 through the connecting angle iron.

At this time, the first cover plate 31 can be driven to rotate by the linear driving source 321, so that the first smoking port 21 can be opened or closed; specifically, the motor push rod drives the first driving rod 322 to move forward to push the driving end 326 of the first connecting plate 323, so that the position of the driving end 326 is changed, and the position change of the driving end 326 can cause the whole first connecting plate 323 to rotate around the rotating end 325, and since the rotating end 325 is arranged on the upper side of the first connecting plate 323 and is simultaneously located at the first cover plate 31 and the upper end of the first smoke suction port 21, it can cause the first cover plate 31 to open outwards.

When the cover plate is completely opened, as shown in fig. 2, since the first smoke suction port 21 is arranged at the upper end of the front panel 2 of the cigarette machine, when the first cover plate 31 is opened outwards, the first cover plate 31 is connected with the front panel 2 of the cigarette machine to form a cover cap covering the upper part of the cooking bench; the first smoke absorption port 21 is generally used for absorbing a large amount of generated oil smoke when a user is stir-fried; at this time, the oil smoke moves upward to contact with the inner side of the first cover plate 31 and is sent into the first smoke suction port 21 under the blocking of the first cover plate 31, thereby preventing the oil smoke from diffusing outward, and increasing the oil smoke suction effect of the range hood.

Moreover, this embodiment drives through first even plate 323's structure first apron 31 is outwards opened for first apron 31's rotating-structure is hidden completely in the cigarette machine front panel 2, prevents that the lampblack absorber from using for a long time, leads to the oil smoke to be attached to first apron 31's rotating-structure, influences rotating-structure's normal use, increases overall structure's life-span, and has increased the aesthetic property of lampblack absorber to a certain extent.

As shown in fig. 3 and 4, the second smoking port 22 is also provided with an opening and closing assembly 3, which includes a second cover plate 33 adapted to the shape and size of the second smoking port 22, and a second driving structure 34 for driving the second cover plate 33 to move, wherein the second cover plate 33 is disposed on the second smoking port 22, and the second cover plate 33 is moved towards the inside of the second smoking port 22 by the second driving structure 34. The second driving structure 34 includes a rotation driving source 341, a second driving rod 342 is connected to the rotation driving source 341, and the second cover 33 is connected to the second driving rod 342.

As shown in fig. 5, the rotation driving source 341 includes a driving motor disposed inside the front panel 2 of the cigarette machine, the driving motor is driven by a rotating shaft, the second driving rod 342 is connected to the driving motor through the rotating shaft, and the second driving rod 342 is driven by the rotating shaft to rotate back and forth to adapt to the opening action of the second cover plate 33; the back of the second cover plate 33 is provided with a connecting angle iron, and the connecting angle iron is connected with the other end of the second driving rod 342; in this embodiment, be equipped with the bar groove on the angle bar, through the bar groove adjust second actuating lever 342 with the rotation tie point of angle bar realizes the fine setting adaptation.

When the rotation driving source 341 is operated, the second driving rod 342 can drive the second cover plate 33 to move inward, i.e., the state shown in fig. 2. The second oil smoke mouth is generally used for stewing a small amount of oil smoke of unilateral that generates when cooking, the lower second oil smoke mouth of accessible height absorbs this moment, because the second oil smoke mouth is located the lower extreme of cigarette machine front panel 2 and is close to the rear side wall of cigarette machine main part 1, consequently, thereby in order to prevent the oil smoke second oil smoke mouth entering and remaining on the rear side wall of cigarette machine main part 1 and be difficult to the clearance, this patent sets up at the second apron 33 of inside motion, block the oil smoke of the rear side wall motion towards cigarette machine main part 1, and guide oil smoke upward movement, thereby can reduce the clean frequency of lampblack absorber, and the user of being convenient for uses.

So far, both have been configured respectively in this patent and have been opened and shut subassembly 3 and control respectively first smoking mouth 21 or/and second smoking mouth 22 are opened, and the user's accessible is opened simultaneously first smoking mouth 21 and second smoking mouth 22 increase total smoking mouth size, increase the oil absorption cigarette efficiency of lampblack absorber machine. However, since the power of the fan 5 in the range hood is limited, when the first smoke sucking port 21 and the second smoke sucking port 22 are opened at the same time, the power of the fan 5 may cause undesirable smoking effect, which affects normal smoke sucking. For this reason, this patent can deal with different cooking situations, that is, the above-mentioned stir-fry situation and the stewing situation, respectively by controlling the first smoking opening 21 or the second smoking opening 22 to be opened alone, and increase the suction force of the single smoking opening by making the fan 5 output the single smoking opening, so as to increase the smoking effect.

Furthermore, a filter screen part 211 is arranged on the first smoking port 21, and the filter screen part 211 is used for separating the first smoking port 21 into a plurality of strip-shaped smoking ports. The oil smoke separation is realized through the filter screen part 211, so that oil stains are prevented from being attached to the fan 5.

Next, the noise reduction air duct device in the range hood of this patent is described, as shown in fig. 1 and 2, it includes a casing 4 and the above-mentioned fan 5, the casing 4 is connected to the upper end of the range hood main body 1, and it is square as a whole, and the fan 5 is installed therein.

As shown in fig. 7, the fan 5 is in a volute shape as a whole, and has two air suction ports 51 at the left and right sides and an air outlet 53 at the top, and an impeller is arranged in the fan 5, and air suction is realized by rotation of the impeller; in the patent, the lower end of the casing 4 is open and is communicated with the cigarette machine main body 1 up and down to realize the oil smoke entering from the cigarette machine main body 1 and being sent out from the air outlet 53 of the fan 5.

In the patent, a guide cover 6 for noise reduction is arranged and covers the outer edge of an air suction opening 51 of the fan 5; the air guide sleeve 6 is provided with an air inlet 61 facing the lower end of the housing 4. The air guide sleeve 6 is provided with an air guide wall 62 facing the air suction opening 51 and biased towards one side of the air suction opening 51, and is used for enabling oil smoke to enter the air guide sleeve 6 from an air inlet 61 and enter the air suction opening 51 along the biased air guide wall 62.

As shown in fig. 8 and 9, the flow guide wall 62 is a semicircle, which is provided with an arc top adapted to the shape of the upper end of the air suction opening 51, a connecting wall 63 annularly arranged on the outer edge of the flow guide wall 62 is arranged between the flow guide wall 62 and the fan 5, the connecting wall 63 is strip-shaped, and the width of the connecting wall 63 is narrowed from bottom to top to adapt to the offset flow guide wall 62 because the flow guide wall 62 is offset towards the direction of the air suction opening 51.

At this time, the flow guide wall 62 is connected with the connecting wall 63 to form a complete flow guide cover 6, and two flow guide covers 6 are arranged and fixed on the air suction ports 51 on the two sides of the fan 5 respectively. As shown in fig. 2, 8 and 9, the lower end of the flow guide wall 62 is connected to the casing 4, and the lower ends of the front and rear sides of the connecting wall 63 are also connected to the casing 4, so that the air inlet 61 formed by the flow guide cover 6 is completely communicated with the range hood body 1, and the oil smoke entering from the range hood body 1 can only enter the casing 4 through the air inlet 61.

At this moment, a noise reduction air duct with the area being reduced from large to small is formed in the air guide sleeve 6, when oil smoke enters the air guide sleeve 6 from the air inlet 61 of the air guide sleeve 6, the oil smoke gradually deviates towards the square of the fan 5 along the biased air guide wall 62, so that the oil smoke movement is guided through the biased air guide sleeve 6, the oil smoke is prevented from colliding at will to generate noise in the air guide sleeve 6, and noise reduction is realized.

In addition, the air inlet 61 is provided with a flow partition plate 64 connected between the flow guide wall 62 and the fan 5, and the flow partition plate is used for dividing the oil smoke into a plurality of channels to be sent into the flow guide cover 6. As shown in fig. 9, the flow dividing plates 64 are provided with three, which are sequentially and equally arranged on the air inlet 61, and four small air inlets 61 with the same size are formed by the three flow dividing plates 64, which can be used for dividing a puff of soot into a plurality of small soot, one of which can play a role in guiding soot, and reduce the collision of soot with the air guide sleeve 6, so as to reduce noise; the second one can play the oil smoke reposition of redundant personnel effect, reduces oil smoke and kuppe 6 collision power, reduces the noise.

Furthermore, a plurality of first sound absorbing holes 65 are formed in the flow guide wall 62, and a first sound absorbing layer covering the first sound absorbing holes 65 is formed outside the flow guide wall 62. As shown in fig. 8 and 9, the first sound absorbing hole 65 includes a plurality of small holes arranged in an array on the flow guide wall 62, the aperture of the small hole is between 0.1cm and 1cm, and the first sound absorbing layer is made of a sound absorbing material, such as sound absorbing cotton, and covers the flow guide wall 62 to further reduce the noise emitted from the flow guide wall 62, so as to reduce the noise. Further, the flow guide wall 62 in the present embodiment has a large overall area, so that it is convenient to provide a larger number of first sound absorbing holes 65, and a first sound absorbing layer having a larger area can be provided to increase the sound absorbing effect.

Further, because fan 5 in this embodiment is equipped with two inlet scoop 51 to dispose two kuppes 6, in order to further increase the sound absorbing effect, still be equipped with drainage plate 52 in this patent, drainage plate 52 is the V-arrangement, and drainage plate 52's both ends link to each other with one side border of two 6 air intakes 61 of kuppe respectively, be equipped with a plurality of seconds on the drainage plate 52 and inhale sound hole 521, the inboard of drainage plate 52 is equipped with the cover and is in the second inhales sound hole 521 and goes up the second and inhale the sound layer. The second sound absorbing layer is also made of sound absorbing cotton materials, the whole strand of oil smoke sent into from the cigarette machine main body 1 is divided into two strands by the drainage plate 52, the two air guide sleeves 6 are respectively sent into for further silencing, the diversion and the diversion of the oil smoke are realized through the drainage plate 52, and when the oil smoke collides with the guide plate, the sound is absorbed through the second sound absorbing layer arranged on the guide plate, so that the silencing is realized.

In fact, the air guide sleeve 6 in this patent can also be used on the fan 5 only provided with a plurality of air suction openings 51, and the fan 5 with a plurality of air suction openings 51 can help to increase the smoking effect.

The above embodiments are only preferred embodiments of the present patent, and the protection scope of the present patent is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the patent shall be covered by the protection scope of the patent.

Claims (10)

1. A range hood, comprising:

a housing (4);

the cigarette machine main body (1) is connected with the shell (4), and the front end of the cigarette machine main body (1) is provided with a cigarette machine front panel (2);

the fan (5) is arranged in the shell (4), and the fan (5) is provided with an air suction opening (51) for sucking oil smoke; and

the air guide sleeve (6) is covered on the outer edge of the air suction opening (51) of the fan (5), and an air inlet (61) is formed in one side of the air guide sleeve (6); the air guide sleeve (6) is provided with an air guide wall (62) facing the air suction opening (51) and biased towards one side of the air suction opening (51) and used for enabling oil smoke to enter the air guide sleeve (6) from an air inlet (61) and enter the air suction opening (51) along the biased air guide wall (62).

2. A range hood according to claim 1, characterized in that: the air guide sleeve (6) further comprises a connecting wall (63) annularly arranged on the outer edge of the air guide wall (62), and the other end of the connecting wall (63) is connected to the outer edge of an air suction opening (51) of the fan (5); the connecting wall (63) is provided with an arc-shaped top.

3. A range hood according to claim 1, characterized in that: and the air inlet (61) is provided with a flow partition plate (64) connected between the flow guide wall (62) and the fan (5) and used for dividing the oil smoke into a plurality of channels to be sent into the flow guide cover (6).

4. A range hood according to claim 3, characterized in that: the flow partition plates (64) are arranged in a plurality and are sequentially and equally distributed on the air inlets (61).

5. A range hood according to claim 1, characterized in that: the flow guide wall (62) is provided with a plurality of first sound absorption holes (65), and a first sound absorption layer covering the first sound absorption holes (65) is arranged outside the flow guide wall (62).

6. A range hood according to claim 1, characterized in that: the left side and the right side of the fan (5) are both provided with two air suction openings (51), and the two air guide sleeves (6) are respectively covered on the two air suction openings (51);

the wind guide sleeve is characterized by further comprising a drainage plate (52), wherein the drainage plate (52) is V-shaped, and two ends of the drainage plate (52) are connected with one side edge of the air inlets (61) of the two wind guide sleeves (6) respectively.

7. A range hood according to any of claims 1-6, characterized in that: a first smoking port (21) and a second smoking port (22) are respectively arranged on the front panel (2) of the cigarette machine; also comprises

The opening and closing components (3) are arranged on the first smoking port (21) and the second smoking port (22) respectively, and the opening and closing components (3) are used for enabling the first smoking port (21) or/and the second smoking port (22) to be opened or enabling the first smoking port (21) or/and the second smoking port (22) to be closed.

8. A range hood according to claim 7, characterized in that: the front panel (2) of the cigarette machine is obliquely arranged on the cigarette machine main body (1), and the first cigarette suction port (21) and the second cigarette suction port (22) are respectively arranged on the front panel (2) of the cigarette machine in a front-back manner.

9. A range hood according to claim 7, characterized in that: the opening and closing assembly (3) comprises a first cover plate (31) and a first driving structure (32) for driving the first cover plate (31) to move; the first cover plate (31) is opened outward around the upper end of the first smoking port (21).

10. A range hood according to claim 7, characterized in that: the opening and closing assembly (3) further comprises a second driving structure (34), the second driving structure (34) comprises a rotating driving source (341), the rotating driving source (341) is connected with a second driving rod (342), and the second driving rod (342) is connected with a second cover plate (33).

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